SCAFFOLD, IN PARTICULAR MOBILE SCAFFOLD

Description

The invention relates to a scaffold, particularly a mobile scaffold, with the features of the preamble of claim 1.

TECHNOLOGICAL BACKGROUND AND PRIOR ART

A mobile scaffold and a method for mounting and demounting this mobile scaffold have become known from DE 10 2008 051 135 A1 and the parallel EP 2 175 087 A1 of the Applicant. Such a mobile scaffold can also be termed a mobile work platform. At the time of construction of this mobile scaffold a side protection railing consisting of individual scaffold struts is mounted in advance, or two such side protection railings are respectively mounted in advance at a horizontal spacing from one another, on horizontal rungs of support frames, which are also termed ladders. The or each individual support strut extends rectilinearly along its support strut longitudinal axis and has support strut ends which extend in opposite directions away from one another and which are each constructed as a detent claw.

Detent claws of that kind have become known from, for example, DE 37 02 152 A1 and the parallel EP 0 276 489 as well as from DE 38 22 215 A1 and the parallel EP 0 348 885 A2. They enable a mechanically positive and secure fixing of the components having these detent claws, such as scaffolding floors, diagonal struts and/or horizontal struts, to other scaffolding struts having a round cross-section, wherein in the fixed state they are pivotable relative to these other scaffolding struts.

In order to construct or assemble the mobile scaffold the starting point is from a first level, preferably from a first scaffolding floor, of a lower storey, which is constructed from a vertically erected first support frame and a second support frame, which is vertically erected at a horizontal spacing therefrom, and from a first scaffolding floor. Each support frame is a ladder consisting of two support struts and of a plurality of horizontal rungs, which extend between the two support struts parallelly and at equal spacings from one another and which are each rigidly connected with the two support struts.

Starting from the first storey initially either with the assistance of two first scaffolding struts, which can be or are later installed as diagonals for diagonal stiffening of the mobile scaffold, or with the assistance of an auxiliary component, which comprises one or more support frame suspension hooks and which at the time of assembly of the mobile scaffold functions or function as a support frame suspension device, a third support frame constructed as a third ladder with a plurality of horizontal rungs is suspended in a vertical intermediate assembly setting either at the two first scaffolding struts or at the auxiliary component, wherein the two first scaffolding struts or the auxiliary component is or are supported at the already erected lower, first support frame, which is constructed as a first ladder with a plurality of horizontal rungs. Two individual second scaffolding struts which each extend rectilinearly and which also each have a suspension unit in the form of a detent claw at scaffolding strut ends thereof extending in opposite directions away from one another are subsequently mounted as follows: Initially, a first second scaffolding strut of the two individual second scaffolding struts is releasably suspended by the first detent claw of its two detent claws at an uppermost rung of an upper, fourth support frame, which is constructed as a fourth ladder with a plurality of horizontal rungs and which was already erected on the lower, second support frame constructed as a third ladder with a plurality of horizontal rungs. The first second scaffolding strut is subsequently suspended by the second detent claw of its two detent claws at an uppermost rung of the third support frame present in its intermediate assembly setting, for which purpose this was transferred beforehand from its vertical intermediate assembly setting—still vertically supported either at the two first scaffolding struts or at the auxiliary component—to an inclined intermediate assembly setting by pivotation relative to the first support frame about a horizontal pivot axis. The second second scaffolding strut of the two individual second scaffolding struts is subsequently or even beforehand releasably suspended by the first detent claw of its two detent claws at the uppermost rung of the upper, fourth support frame. The second second scaffolding strut of the two second scaffolding struts is subsequently suspended by the second detent claw of its two detent claws at the uppermost rung of the third support frame disposed in its inclined intermediate assembly setting. Subsequently thereto the third support frame in its inclined intermediate assembly setting is guided upwardly together with the two individual second scaffolding struts secured thereto to be pivotable relative to this and erected on the already mounted, lower first support frame. The two individual second scaffolding struts thereby each pass into a horizontal use setting in which they each form a respective simple side support railing, which is mounted in advance and which directly adjoins the first storey in upward direction, for a second storey. In their use setting the two simple side protection railings are each then mounted approximately three metres above a first stand height or above the first scaffolding floor. The two first scaffolding struts, which were used for intermediate support of the third support frame, are subsequently mounted as diagonals for stiffening or—in the case of use of the separate auxiliary component—two scaffolding struts are mounted as diagonals for stiffening. Subsequently thereto a second scaffolding floor is suspended at the third support frame and at the fourth support frame at a respective rung of the third support frame and of the fourth support frame at a height of approximately two metres above the first stand height or above the first scaffolding floor. Each side protection railing of the two simple side protection railings mounted in advance is then disposed approximately one metre above a second stand height or above the second scaffolding floor. The two individual, simple side protection railings thereby each form a hip or back railing for protection of persons from falling down from the second scaffolding floor. Such individual simple side protection railings, which are there characterised by the reference symbols 18.1 and 18.2, do indeed protect persons at hip height from falling down, but do not have an adequate protective function. Accordingly, in the case of this mobile scaffold additional railing elements as knee protective elements, which are also termed knee bars, have to be installed. In that event, in the embodiments shown therein it is equally a case of individual simple side protection railings, each also in the form of a rectilinearly extending scaffolding strut with detent claws at the two scaffolding strut ends thereof. Such knee bars have to be separately handled and mounted. Construction or assembly of the mobile scaffold and also disassembly or demounting thereof are thereby made difficult and complicated. These simple side protection railings, each of which is an individual straight scaffolding strut, can by virtue of their construction be subsequently demounted again all together and indeed also from the second or next-higher storey which is bounded and protected by them. If even only one detent claw of the respective two detent claws of these individual, simple side protection railings is erroneously or even intentionally not detented or erroneously or even intentionally released without reason, there is a substantial safety risk with a danger to life and limb not only to persons standing on the associated scaffolding floor, but also to other persons standing below this scaffolding floor.

So-called side protection double railings have become known in order to make possible a simpler and rapid assembly of a side protection railing having a greater degree of stability. These comprise not only an upper strut for mounting at hip height as a handrail, but also at least one lower strut for mounting as knee protection or a knee bar. Side protection double railings of that kind have become known from, for example, DE 79 25 492 U, DE 297 14 266U, FR 2 887 574 A1, FR 2 887 907 A1, FR 2 908 804 A1, DE 10 2009 041 437 and the parallel EP 2 299 028 A2 as well as DE 10 2009 041 488 A1. The side protection double railings disclosed therein also all have the disadvantage that they can also be subsequently demounted again from the storey, which is bounded and protected by them, by persons not authorised for that purpose, as a result of which a substantial safety risk with danger to life and limb can also arise.

A framework support for lateral support of a main truss, which is also termed framework connector unit, of a quick-assembly hall roof has become known from each of EP 1 035 271A1 and DE 201 05 534 U1. The framework support is also termed framework member therein. The respective framework support comprises a rectilinearly extending top chord, a bottom chord rectilinearly extending parallel thereto and three diagonal struts as well as two parallel transverse struts which each extend between the top chord and the bottom chord and which are each rigidly connected with the top chord and the bottom chord. The top chord of the framework support has two top chord ends which extend in opposite directions away from one another and which are each constructed with a top chord suspension unit. Each top chord suspension unit has a claw with a suspension opening. The suspension openings of the claws of the top chord suspension units of the top chord are open downwardly in the same directions and can each be suspended at a tube section of a main truss, wherein the tube section in the suspended state is partly received in the associated suspension opening of the relevant claw. The bottom chord of the framework support has two bottom chord ends which extend in opposite directions away from one another and which are each constructed with a bottom chord detent claw. Each bottom chord detent claw comprises a claw and a resiliently mounted locking latch for securing a tube section, which is partly receivable in the respective claw, of a main truss. The claws of the bottom chord detent claws of the bottom chord each have a suspension opening. The suspension openings of the claws of the bottom chord detent claws of the bottom chord are downwardly open in the same directions as the two suspension openings of the claws of the two top chord suspension units of the top chord. Such framework supports could indeed—subject to the precondition of adapted dimensioning—be suspended where possible respectively at two rungs of a ladder, which are provided at the respective ladder at a matching vertical spacing from one another, but such framework supports would then not be able to be mounted in advance as a side protection double railing without a safety risk and above all such framework supports could also be demounted from the storey, which is to be bounded and protected by them, by unauthorised persons. This would mean a substantial risk to safety.

SUMMARY OF THE INVENTION

Starting from DE 10 2008 051 135 A1 or the parallel EP 2 175 087 A1 mentioned in the introduction the invention has the object of providing a scaffold, particularly a mobile scaffold, which is mountable or demountable more simply and more rapidly and has a greater degree of stability and which offers a greater level of safeguarding persons from falling down.

This object is fulfilled by the features of claim 1. Accordingly the invention relates to a scaffold or a mobile scaffold which is constructed with at least two vertical ladders, at least one horizontal scaffolding floor and at least one side protection railing for protection of persons from falling down from the scaffolding floor, wherein each ladder of the at least two ladders, comprises at least two parallel vertical struts and a plurality of, preferably parallel, rungs, which each extend between a first vertical strut and a second vertical strut of the at least two vertical struts of the respective ladder at preferably equal rung vertical spacings from one another and which are each fixedly, preferably rigidly, connected with the first vertical strut and the second vertical strut, and wherein a first vertical ladder and a second vertical ladder of the at least two ladders are vertically erected at a ladder horizontal spacing from and preferably substantially parallel to one another and wherein the at least one scaffolding floor extends between the first ladder and the second ladder and is detachably secured to both the first ladder and the second ladder, and wherein secured to the first ladder and the second ladder is a side protection double railing which is mounted or mountable in advance and extends between the first ladder and the second ladder and which comprises an upper strut extending above the at least one scaffolding floor, a lower strut arranged at least partly or substantially or entirely above the at least one scaffolding floor and a plurality of connecting struts, preferably one or more transverse struts and/or one or more diagonal struts, which are each fixedly, preferably rigidly, connected with the lower strut and the upper strut, and wherein—either—the upper strut of the side protection double railing has a first upper strut end with a first upper strut suspension unit with a first upper strut suspension claw, which preferably has a U-shaped or semicircular or J-shaped cross-section and has first upper strut suspension claw sides facing away from one another, preferably in opposite directions, and is open towards its first upper strut suspension claw sides and in a first plug-on direction and by means of which the upper strut is secured, preferably mechanically positively, to a first, preferably uppermost, rung of the rungs of the first ladder to be detachable and to be pivotable in a first vertical pivot plane relative to the first ladder, and wherein the upper strut of the side protection double railing has a second upper strut end, which extends away from the first upper strut end, preferably in an opposite direction, with a second upper strut suspension unit with a second upper strut suspension claw, which has a preferably U-shaped or semicircular or J-shaped cross-section and has second upper strut suspension claw sides facing away from one another preferably in opposite directions and is open towards its two upper strut suspension claw sides and in a second plug-on direction, preferably parallel to the first plug-on direction, and by means of which the upper strut is secured, preferably mechanically positively, to a second, preferably uppermost, rung of the rungs of the second ladder to be detachable and to be pivotable in a second vertical pivot plane relative to the second ladder, and wherein the upper strut of the side protection double railing has an upper strut length which is greater than a first rung horizontal spacing which the first rung of the first ladder and the second rung of the second ladder have from one another, the second rung preferably being arranged at substantially the same first height as the first rung of the first ladder, and wherein the upper strut of the side protection double railing at least in the region of the first upper strut end thereof, which is preferably arranged directly above the first rung of the first ladder, engages over the first rung of the first ladder, and wherein the upper strut of the side protection railing at least in the region of the second upper strut end thereof, which is preferably arranged directly above the second rung of the second ladder, engages over the second rung of the second ladder, and wherein the lower strut of the side protection double railing has a lower strut length which is greater than a second rung horizontal spacing, which preferably corresponds with the first rung horizontal spacing and which a third rung of the rungs of the first ladder and a fourth rung of the rungs of the second ladder have from one another, the fourth rung preferably being arranged at a substantially same second height as the third rung of the first ladder, and wherein the third rung of the first ladder is arranged at a first rung vertical spacing below the first rung of the first ladder, preferably on the first rung next-following in downward direction, and wherein the fourth rung of the second ladder is arranged at a second rung vertical spacing, which preferably corresponds with the first rung vertical spacing, below the second rung of the second ladder, preferably on the second rung next-following in downward direction, and wherein the lower strut of the side protection double railing has a first lower strut end and a second lower strut end extending away therefrom, preferably in an opposite direction, and wherein the lower strut of the side protection double railing at least in the region of the first lower strut end thereof, which is preferably arranged directly below the third rung of the first ladder, engages under the third rung of the first ladder, and wherein the lower strut of the side protection double railing at least in the region of the second lower strut end thereof, which is preferably arranged directly below the fourth rung of the second ladder, engages under the fourth rung of the second ladder, and wherein the upper strut of the side protection double railing at least in the region of the first upper strut end thereof and at least in the region of the second upper strut end thereof as well as the lower strut of the side protection double railing at least in the region of the first lower strut end thereof and at least in the region of the second lower strut end thereof and the first rung and the third rung of the first ladder as well as the second rung and the fourth rung of the second ladder are so configured and arranged in adaptation to one another that the side protection double railing is not demountable without demounting of the first ladder or the second ladder—or—the lower strut of the side protection double railing has a first lower strut end with a first lower strut suspension unit with a first lower strut suspension claw, which has a preferably U-shaped or semicircular or J-shaped cross-section and first lower strut suspension claw sides facing away from one another preferably in opposite directions and is open towards its first lower strut suspension claw sides and in a third plug-on direction and by means of which the lower strut is secured, preferably mechanically positively, to a third rung of the rungs of the first ladder to be detachable and to be pivotable in a third vertical pivot plane relative to the first ladder, and wherein the lower strut of the side protection double railing has a second lower strut end, which extends away from the first lower strut end preferably in an opposite direction, with a second lower strut suspension unit, which preferably has a U-shaped or semicircular or J-shaped cross-section, with a second lower strut suspension claw which has second lower strut suspension claw sides facing away from one another, preferably in opposite directions and is open towards its second lower strut suspension claw sides and in a fourth plug-on direction preferably parallel to the third plug-on direction and by means of which the lower strut is secured, preferably mechanically positively, to a fourth rung of the rungs of the second ladder to be detachable and to be pivotable in a fourth vertical pivot plane relative to the second ladder, and wherein the lower strut of the side protection double railing has a lower strut length which is greater than a third rung horizontal spacing which the third rung of the first ladder and the fourth rung, which is preferably arranged at a third height substantially the same as the third rung of the first ladder, of the second ladder have from one another, and wherein the lower strut of the side protection double railing at least in the region of the first lower strut end thereof, which is preferably arranged directly above the third rung of the first ladder, engages over the third rung of the first ladder, and wherein the lower strut of the side protection railing at least in the region of the second lower strut end thereof, which is preferably arranged directly above the fourth rung of the second ladder, engages over the fourth rung of the second ladder, and wherein the upper strut of the side protection double railing has an upper strut length which is greater than a fourth rung horizontal spacing which preferably corresponds with the third rung horizontal spacing and which a first rung of the rungs of the first ladder and a second rung, which is preferably arranged at a fourth height substantially the same as the third rung of the first ladder, of the rungs of the second ladder have from one another, and wherein the first, preferably uppermost, rung of the first ladder is arranged at a third rung vertical spacing above the third rung of the first ladder, preferably on the third rung next-following in upward direction, and wherein the second, preferably uppermost rung of the second ladder is arranged at a fourth rung vertical spacing, which preferably corresponds with the third rung vertical spacing, above the first rung of the second ladder, preferably on the fourth rung next-following in upward direction, and wherein the upper strut of the side protection double railing has a first upper strut end and a second upper strut end extending away therefrom preferably in an opposite direction, and wherein the upper strut of the side protection double railing at least in the region of the first upper strut end thereof, which is preferably arranged directly below the first strut of the first ladder, engages under the first rung of the first ladder, and wherein the upper strut of the side protection double railing at least in the region of the second upper strut end thereof, which is preferably arranged directly below the second rung of the second ladder, engages under the second rung of the second ladder, and wherein the lower strut of the side protection double railing at least in the region of the first lower strut end thereof and at least in the region of the second lower strut end thereof as well as the upper strut of the side protection double railing at least in the region of the first upper strut end thereof and at least in the region of the second upper strut thereof and the second rung and the fourth rung of the first ladder as well as the first rung and the third rung of the second ladder are so configured and arranged in adaptation to one another that the side protection double railing is not demountable without demounting the first ladder or the second ladder.

According to a preferred embodiment it can be provided that—either—the upper strut of the side protection double railing at least in the region of the first upper strut end thereof and the lower strut of the side protection double railing at least in the region of the first lower strut end thereof have from one another a first strut vertical spacing which is only slightly larger than the first rung vertical spacing and wherein the upper strut of the side protection double railing at least in the region of the second upper strut end thereof and the lower strut of the side protection double railing in the region of the second lower strut end thereof have from one another a second strut vertical spacing which is only slightly larger than the second rung vertical spacing—or—the upper strut of the side protection double railing at least in the region of the first upper strut end thereof and the lower strut of the side protection double railing at least in the region of the first lower strut end thereof have from one another a third strut vertical spacing which is only slightly larger than the third rung vertical spacing and wherein the upper strut of the side protection double railing at least in the region of the second upper strut end thereof and the lower strut of the side protection double railing in the region of the second lower strut end thereof have from one another a fourth strut vertical spacing which is only slightly larger than the fourth rung vertical spacing. The safety of the mobile scaffold is thereby further improved.

According to a particularly preferred embodiment it can be provided that—either—the first strut vertical spacing is configured to be so adapted to the first rung vertical spacing that the first upper strut suspension claw is liftable upwardly at most to such an extent from the first rung of the first ladder that the first upper strut suspension claw is not removable from the first rung of the first ladder and wherein the second strut vertical spacing is configured to be so adapted to the second rung vertical spacing that the second upper strut suspension claw is liftable upwardly at most to such an extent from the second rung of the second ladder that the second upper strut suspension claw is not removable from the second rung of the second ladder—or—the third strut vertical spacing is configured to be so adapted to the third rung vertical spacing that the first lower strut suspension claw is liftable upwardly at most to such an extent from the third rung of the first ladder that the first lower strut suspension claw is not removable from the third rung of the first ladder and wherein the fourth strut vertical spacing is configured to be so adapted to the fourth rung vertical spacing that the second lower strut suspension claw is liftable upwardly at most to such an extent from the third rung of the first ladder that the second lower strut suspension claw is not removable from the third rung of the first ladder. The safeguarding of the scaffold against persons falling down is enhanced to a special degree.

According to a development it can be provided that—either—the first lower strut end of the lower strut extends in a first space bounded by two directly successive rungs of the first ladder and by the associated two vertical struts of the first ladder and the second lower strut end of the lower strut extends in a second space bounded by two directly successive rungs of the second ladder and by the associated two vertical struts of the second ladder—or—the first upper strut end of the upper strut extends in a third space bounded by two directly successive rungs of the first ladder and by the associated two vertical struts of the first ladder and the second upper strut end of the upper strut extends in a fourth space bounded by two directly successive rungs of the second ladder and by the associated two vertical struts of the second ladder. the safety of the scaffold is thereby still further increased.

According to an embodiment it can be provided that—either—the lower strut has between the two lower strut ends thereof a lower strut middle part which contains a lower strut centre of the lower strut and which has lower strut middle part ends, which face away from one another, preferably in opposite directions, and from which in each instance a lower strut part of the lower strut is cranked over in a first transverse direction towards the upper strut and/or in a second transverse direction away from the respective upper strut end of the upper strut or towards the respectively associated vertical strut of the first and second ladders—or—the upper strut between the two upper strut ends thereof has an upper strut middle part which contains an upper strut centre of the upper strut and which has upper strut middle part ends, which face away from one another, preferably in opposite directions, and from which in each instance an upper strut part of the upper strut is cranked over in a third transverse direction towards the lower strut and/or in a fourth transverse direction away from the respective lower strut end of the lower strut or towards the respectively associated vertical strut of the first and second ladders. As a result, ladders which already exist can advantageously be used in combination with the side protection double railing with increased safety.

According to a particularly preferred example of embodiment it can be provided that—either —the lower strut has in the region of each of the two lower strut ends thereof a respective lower strut end part which in each instance is cranked over from the lower strut middle part twice or in more than two, preferably three, directions—or—the upper strut has in the region of each of the two upper strut ends thereof a respective upper strut end part which is cranked over in each instance from the upper strut middle part twice or in more than two, preferably three, directions. Particularly advantageous possibilities of securing the lower strut in conjunction with the foregoing advantages can thereby be achieved.

According to an embodiment it can be provided that—either—the lower strut middle part extends rectilinearly along a lower strut middle part longitudinal axis of the lower strut middle part parallelly to an upper strut longitudinal axis of the upper strut along which the upper strut extends, wherein the upper strut longitudinal axis extends in a notional first plane or vertical plane containing the lower strut middle part longitudinal axis—or—the upper strut middle part extends rectilinearly along an upper strut middle part longitudinal axis of the upper strut middle part parallelly to a lower strut longitudinal axis of the lower strut along which the lower strut extends, wherein the lower strut longitudinal axis extends in a notional second plane or vertical plane containing the upper strut middle part longitudinal axis. This makes possible a simple, stable and economic construction of the side protection double railing according to the invention of the scaffold constructed therewith.

According to a particularly preferred embodiment it can be provided that—either—each lower strut end part extends rectilinearly along a lower strut end part longitudinal axis, which extends parallelly to the lower strut middle part longitudinal axis of the lower strut middle part, preferably offset with respect to the lower strut middle part longitudinal axis upwardly or to a first side, of the respective lower strut end part,—or—each upper strut end part extends rectilinearly along an upper strut end part longitudinal axis, which extends parallelly to the upper strut middle part longitudinal axis of the upper strut middle part, preferably offset with respect to the upper strut middle part longitudinal axis downwardly or to a second side, of the respective upper strut end part. As a result the foregoing advantages can be further enhanced.

According to a development it can be provided that—either—each lower strut end part is arranged to be laterally offset, preferably towards or outwardly with respect to the directly associated vertical strut or associated ladder, in a fifth transverse direction with respect to the lower strut middle part—or—each upper strut end part is arranged to be laterally offset, preferably towards or outwardly with respect to the directly associated vertical strut or associated ladder, in a sixth transverse direction with respect to the upper strut middle part. The foregoing advantages can thereby be still further improved.

According to a development it can be provided that—either—the upper strut is formed with a straight, preferably tubular, upper strut rod element which extends along an upper strut longitudinal axis of the upper strut or along the upper strut longitudinal axis of the upper strut and which has a first upper strut rod element end, which is connected with the first upper strut suspension unit or to which the first upper strut suspension unit is secured and which has a second upper strut rod element end which extends away from the first upper strut rod element end in an opposite direction and which is connected with the second upper strut suspension unit or to which the second upper strut suspension unit is secured—or—the lower strut is formed with a straight, preferably tubular, lower strut rod element which extends along a lower strut longitudinal axis of the lower strut or along the lower strut longitudinal axis of the lower strut and which has a first lower strut rod element end, which is connected with the first lower strut suspension unit or to which the first lower strut suspension unit is secured and which has a second lower strut rod element end which extends away from the first lower strut rod element end in an opposite direction and which is connected with the second lower strut suspension unit or to which the second lower strut suspension unit is secured. This makes possible a further simplified and more economic construction.

According to a preferred embodiment it can be provided that the upper strut length of the upper strut is substantially or approximately or about the same as the lower strut length of the lower strut. The side protection double railing according to the invention can thereby be handled particularly simply and easily and installation and de-installation thereof can be carried out particularly simply and rapidly.

According to a very much preferred example of embodiment it can be provided that—either—the first lower strut end of the lower strut has a first lower strut securing unit with a first lower strut claw, preferably having a U-shaped or semicircular or J-shaped cross-section, for reception of the first or second vertical strut of the first ladder and with a first locking element for locking the first lower strut claw with an associated vertical strut of the first ladder and the second lower strut end of the lower strut has a second lower strut securing unit with a second lower strut claw, preferably having a U-shaped or semicircular or J-shaped cross-section, for reception of the first or second vertical strut of the second ladder and with a second locking element for locking the second lower strut claw to an associated vertical strut of the second ladder, wherein the first lower strut claw has first lower strut claw sides facing away from one another, preferably in opposite directions, and is open towards its first lower strut claw sides and in a fifth plug-on direction, preferably towards an outer side of the side protection double railing, and the second lower strut claw has second lower strut claw sides facing away from one another, preferably in opposite directions, and is open towards its second lower strut claw sides and in a sixth plug-on direction, preferably parallel to the third plug-on direction, particularly towards the same outer side of the side protection double railing, and wherein the first locking element is transferrable automatically or by manual actuation, preferably against the spring force of a first spring, particularly during plugging onto the associated vertical strut, to a first open setting in which the first lower strut claw can be plugged in the fifth plug-on direction onto the associated vertical strut of the first ladder and is transferrable, preferably produced by a spring restoring force of the first spring or by manual actuation or by gravitational force, from the first open setting to a first locking setting in which the first lower strut claw is mechanically positively lockable to the associated vertical strut against removal from the associated vertical strut and the first lower strut claw is detachably securable or detachably secured to the associated vertical strut of the first ladder by means of the first locking element disposed in its first locking setting, and wherein the second locking element is transferrable automatically or by manual actuation, preferably against the spring force of a second spring, particularly during plugging onto the associated vertical strut, to a second open setting in which the second lower strut claw can be plugged in the sixth plug-on direction onto the associated vertical strut of the second ladder and is transferrable, preferably produced by a spring restoring force of the second spring or by manual actuation or by gravitational force, from the second open setting to a second locking setting in which the second lower strut claw is mechanically positively lockable to the associated vertical strut against removal from the associated vertical strut and the second lower strut claw is detachably securable or detachably secured to the associated vertical strut of the second ladder by means of the second locking element disposed in its second locking setting—or—the first upper strut end of the upper strut has a first upper strut securing unit with a first upper strut claw, preferably having a U-shaped or semicircular or J-shaped cross-section, for reception of the first or second vertical strut of the first ladder and with a third locking element for locking the first upper strut claw to an associated vertical strut of the first ladder and the second upper strut end of the upper strut has a second upper strut securing unit with a second upper strut claw, preferably having a U-shaped or semicircular or J-shaped cross-section, for reception of the first or second vertical strut of the second ladder and with a fourth locking element for locking the second upper strut claw to an associated vertical strut of the second ladder, wherein the first upper strut claw has first upper strut claw sides facing away from one another, preferably in opposite directions, and is open towards its first upper strut claw sides and in a seventh plug-on direction, preferably towards an outer side of the side protection double railing, and the second upper strut claw has second upper strut claw sides facing away from one another, preferably in opposite directions, and is open towards its second upper strut claw sides and in an eighth plug-on direction, preferably parallel to the seventh plug-on direction, particularly towards the same outer side of the side protection double railing, and wherein the third locking element is transferrable automatically or by manual actuation, preferably against the spring force of a third spring, particularly during plugging onto the associated vertical strut, to a third open setting in which the first upper strut claw can be plugged in the seventh plug-on direction onto the associated vertical strut of the first ladder and is transferrable, preferably produced by a spring restoring force of the third spring or by manual actuation or by gravitational force, from the third open setting to a third locking setting in which the first upper strut claw is mechanically positively lockable to the associated vertical strut of the first ladder against removal from the associated vertical strut of the first ladder and the first upper strut claw is detachably securable or detachably secured to the associated vertical strut of the first ladder by means of the third locking element disposed in its third locking setting and the fourth locking element is transferrable automatically or by manual actuation, preferably against the spring force of a fourth spring, particularly during plugging onto the associated vertical strut, to a fourth open setting in which the second upper strut claw can be plugged in the eighth plug-on direction onto the associated vertical strut of the second ladder and is transferrable, preferably produced by a spring restoring force of the first spring or by manual actuation or by gravitational force, from the fourth open setting into a fourth locking setting in which the second upper strut claw is mechanically positively lockable to the associated vertical strut of the second ladder against removal from the associated vertical strut of the second ladder and the second upper strut claw is detachably securable or detachably secured to the associated vertical strut of the second ladder by means of the fourth locking element disposed in its fourth locking setting. The stability and safety of the scaffold can thereby be enhanced to a quite special degree.

According to a particularly advantageous embodiment it can be provided that—either—the first lower strut claw of the first lower strut securing unit is open in the fifth plug-on direction perpendicularly to the first plug-on direction in which the first upper strut suspension claw of the first upper strut suspension unit is open and the second lower strut claw of the second lower strut securing unit is open in the sixth plug-on direction perpendicularly to the second plug-on direction in which the second upper strut suspension claw of the second upper strut suspension unit is open—or—the first upper strut claw of the first upper strut securing unit is open in the seventh plug-on direction perpendicularly to the third plug-on direction in which the first lower strut suspension claw of the first lower strut suspension unit is open and the second upper strut claw of the second upper strut securing unit is open in the eighth plug-on direction perpendicularly to the fourth plug-on direction in which the second lower strut suspension claw of the second lower strut suspension unit is open.

In other words it can be provided that—either—the first lower strut claw open in a or the fifth plug-on direction is arranged to be turned in a first angle of 90 degrees about the upper strut longitudinal axis of the upper strut relative to the first upper strut claw open in the first plug-on direction and the second lower strut claw open in a or the sixth plug-on direction is arranged to be turned in a second angle of 90 degrees about the upper strut longitudinal axis of the upper strut relative to the second upper strut claw open in the second plug-on direction—or—the first upper strut claw open in a or the seventh plug-on direction is arranged to be turned in a third angle of 90 degrees about the lower strut longitudinal axis of the lower strut relative to the first lower strut claw open in the third plug-on direction and the second upper strut claw open in a or the eighth plug-on direction is arranged to be turned in a fourth angle of 90 degrees about the lower strut longitudinal axis of the lower strut relative to the second lower strut claw open in the fourth plug-on direction. By virtue of this seemingly comparatively simple measure the foregoing advantages of the side protection double railing according to the invention or the scaffold according to the invention can be realised to a special degree.

The safety and stability of the scaffold can be still further enhanced if—either—the first upper strut end or the first upper strut suspension unit of the upper strut has a fifth locking element for locking the first upper strut suspension claw to the first rung of the first ladder and the second upper strut end or the second upper strut suspension unit of the upper strut has a sixth locking element for locking the second upper strut suspension claw to the second rung of the second ladder, wherein the first upper strut suspension claw has first upper strut suspension claws facing away from one another, preferably in opposite directions, and is open towards its first upper strut suspension claw sides and in the first plug-on direction and wherein the second upper strut suspension claw has second upper strut claw sides facing away from one another, preferably in opposite directions, and is open towards its second upper strut suspension claw sides and in the second plug-on direction, and wherein the fifth locking element is transferrable automatically or by manual actuation, preferably against the spring force of a spring, particularly during plugging of the first upper strut suspension claw onto the first rung of the first ladder, to a fifth open setting in which the first upper strut suspension claw can be plugged in the first plug-on direction onto the first rung of the first ladder and is transferrable, preferably produced by a spring restoring force of the spring or by manual actuation or by gravitational force, from the fifth open setting to a fifth locking setting in which the first upper strut suspension claw is locked to the first rung of the first ladder against removal from the first rung of the first ladder and wherein the sixth locking element is transferrable automatically or by manual actuation, preferably against the spring force of a spring, particularly during plugging of the second upper strut suspension claw onto the second rung of the first ladder, to a sixth open setting in which the second upper strut suspension claw can be plugged in the second plug-on direction onto the second rung of the second ladder and is transferrable from the sixth open setting to a sixth locking setting in which the second upper strut suspension claw is locked to the second rung of the second ladder against removal from the second rung of the second ladder—or—the first lower strut end or the first lower strut suspension unit of the lower strut has a seventh locking element for locking the first lower strut suspension claw to the third rung of the first ladder and the second lower strut end or the second lower strut suspension unit of the lower strut has an eighth locking element for locking the second lower strut suspension claw to the fourth rung of the first ladder, wherein the first lower strut suspension claw has first lower strut suspension claw sides facing away from one another, preferably in opposite directions, and is open towards its first lower strut suspension claw sides, preferably in opposite directions, and in the third plug-on direction and wherein the second lower strut suspension claw has second lower strut suspension claw sides facing away from one another, preferably in opposite directions, and is open towards its second lower strut suspension claw sides, preferably in opposite directions, and in the fourth plug-on direction, and wherein the seventh locking element is transferrable automatically or by manual actuation, preferably against the spring force of a spring, particularly during plugging of the first lower strut suspension claw onto the third rung of the first ladder, to a seventh open setting in which the first lower strut suspension claw can be plugged in the third plug-on direction onto the third rung of the first ladder and is transferrable, preferably produced by a spring restoring force of the spring or by manual actuation or by gravitational force, from the seventh open setting to a seventh locking setting in which the first lower strut claw is locked to the third rung of the first ladder against removal from the third rung of the first ladder, and wherein the eighth locking element is transferrable automatically or by manual actuation, preferably against the spring force of a spring, particularly during plugging of the second lower strut suspension claw onto the fourth rung of the second ladder, to an eighth open setting in which the second lower strut suspension claw can be plugged in the fourth plug-on direction onto the fourth rung of the second ladder and is transferrable, preferably produced by a spring restoring force of the spring or by manual actuation or by gravitational force, from the eighth open setting to an eighth locking setting in which the second lower strut claw is locked to the fourth rung of the second ladder against removal from the fourth rung of the second ladder.

According to a preferred development it can be provided that—either—the first lower strut securing unit and the second lower strut securing unit are of the same or different configuration—or—the first upper strut securing unit and the second upper strut securing unit are of the same or different configuration and/or that—either—the first upper strut suspension unit and the second upper strut suspension unit are of the same or different configuration—or—the first lower strut suspension unit and the second lower strut suspension unit are of the same or different configuration. As a result the side protection double railing or the scaffold provided therewith can either be produced particularly simply and economically or widened applications can thus be realised.

According to a particularly preferred example of embodiment it can be provided that—either—the first lower strut securing unit, the second lower strut securing unit, the first upper strut suspension unit and the second upper strut suspension unit are of the same or different configuration—or—the first upper strut securing unit, the second upper strut securing unit, the first lower strut suspension unit and the second lower strut suspension unit are of the same or different configuration. As a result either a particularly economic and simple construction of the side protection double railing or the scaffold provided therewith can be achieved or widened applications can thus be realised.

According to a preferred development it can be provided that the side protection double railing extends along a side protection double railing longitudinal axis of the side protection double railing and is formed to be mirror symmetrical with respect to a side protection double railing longitudinal centre plane of symmetry extending perpendicularly to the side protection double railing longitudinal axis. Production costs can thereby be further reduced and simpler storage, simpler handling and simpler mounting can thereby be made possible.

According to a preferred example of embodiment it can be provided that—either—the first upper strut suspension claw of the upper strut of the side protection double railing is open downwardly in the first plug-on direction, preferably towards the lower strut and/or perpendicularly to a or the upper strut longitudinal axis of the upper strut and/or parallel to a vertical strut longitudinal axis of the first and/or second vertical strut of the first ladder, and the second upper strut suspension claw of the upper strut of the side protection double railing is open downwardly in the second plug-on direction, preferably towards the lower strut and/or perpendicularly to the upper strut longitudinal axis of the upper strut and/or parallel to the vertical strut longitudinal axis of the first and/or second vertical strut of the first ladder,—or—the first lower strut suspension claw of the lower strut of the side protection double railing is open downwardly in the third plug-on direction, preferably away from the upper strut and/or perpendicularly to a or the lower strut longitudinal axis of the lower strut and/or parallel to a vertical strut longitudinal axis of the first and/or second vertical strut of the first ladder, and the second lower strut suspension claw of the lower strut of the side protection double railing is open downwardly in the fourth plug-on direction, preferably away from the upper strut and/or perpendicularly to the lower strut longitudinal axis of the lower strut and/or parallelly to the vertical strut longitudinal axis of the first and/or second vertical strut of the first ladder. The scaffold or the side protection double railing can thereby be produced particularly simply and economically as well mounted and demounted in simple manner.

A further improvement in the sense of the present advantages can be achieved if—either—the first plug-on direction in which the first upper strut suspension claw of the upper strut of the side protection double railing is open and the second plug-on direction in which the second upper strut suspension claw of the upper strut of the side protection double railing is open are the same or parallel to one another—or—the third plug-on direction in which the first lower strut suspension claw of the lower strut of the side protection double railing is open and the fourth plug-on direction in which the second lower strut suspension claw of the lower strut of the side protection double railing is open are the same or parallel to one another.

According to an alternative embodiment it can be provided that—either—the first upper strut suspension claw of the upper strut of the side protection double railing is open in the first plug-on direction towards the second upper strut end of the upper strut of the side protection double railing or towards the second upper strut suspension claw of the upper strut of the side protection double railing and the second upper strut suspension claw of the upper strut of the side protection double railing is open in the second plug-on direction, preferably oppositely, especially parallel to the first plug-on direction, towards the first upper strut end of the upper strut of the side protection double railing or towards the first upper strut suspension claw of the upper strut of the side protection double railing—or—the first lower strut suspension claw of the lower strut of the side protection double railing is open in the third plug-on direction towards the second lower strut end of the lower strut of the side protection double railing or towards the second lower strut suspension claw of the lower strut of the side protection double railing and the second lower strut suspension claw of the lower strut of the side protection double railing is open in the fourth plug-on direction, preferably oppositely, especially parallel to the third plug-on direction, towards the first lower strut end of the lower strut of the side protection double railing or towards the first lower strut suspension claw of the lower strut of the side protection double railing. Consequently, in the case of still comparatively simple and, at the same time, particularly reliable possibilities for mounting of the side protection double railing in advance an additional safeguarding against removal thereof is realised, so that it can be achieved to a special degree with even greater safety that the side protection double railing cannot be demounted without demounting of the first ladder or the second ladder.

According to an alternative embodiment it can be provided that—either—the first plug-on direction in which the first upper strut suspension claw of the upper strut of the side protection double railing is open and the second plug-on direction in which the second upper strut suspension claw of the upper strut of the side protection double railing is open are different or include a fifth angle, preferably of 90 degrees, with one another—or—the third plug-on direction in which the first lower strut suspension claw of the lower strut of the side protection double railing is open and the fourth plug-on direction in which the second lower strut suspension claw of the lower strut of the side protection double railing is open are different or include a sixth angle, preferably of 90 degrees, with one another. Widened possibilities of application and use can thereby be realised.

In that case it can be provided that—either—the first upper strut suspension claw of the upper strut of the side protection double railing is downwardly open in the first plug-on direction, preferably towards the lower strut and/or perpendicularly to a or the upper strut longitudinal axis of the upper strut and/or parallelly to a or the vertical strut longitudinal axis of the first and/or second vertical strut of the first ladder, and the second upper strut suspension claw of the upper strut of the side protection double railing is open in the second plug-on direction towards the first upper strut end of the upper strut of the side protection double railing or towards the first upper strut suspension claw of the upper strut of the side protection double railing, preferably perpendicularly to the first plug-on direction,—or—the first lower strut suspension claw of the lower strut of the side protection double railing is downwardly open in the third plug-on direction, preferably away from the upper strut and/or perpendicularly to a or the lower strut longitudinal axis of the lower strut and/or parallelly to a or the vertical strut longitudinal axis of the first and/or second vertical strut of the first ladder, and the second lower strut suspension claw of the lower strut of the side protection double railing is open in the fourth plug-on direction towards the first lower strut end of the lower strut of the side protection double railing or towards the first lower strut suspension claw of the lower strut of the side protection double railing, preferably perpendicularly to the third plug-on direction. As a result, in the case of still comparatively simple possibilities for mounting of the side protection double railing in advance an additional safeguarding against removal thereof is realised, so that it can be achieved to a special degree with even greater safety that the side protection double railing cannot be demounted without demounting of the first ladder or the second ladder.

It will be obvious that the aforesaid measures can be combined with one another, as desired, within the scope of feasibility.

Advantageous examples of embodiment of the invention are described in detail in the following on the basis of the figures.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows in a three-dimensional illustration a scaffold according to the invention, which is provided with side protection double railing in accordance with the invention, mounted in advance;

FIG. 2 shows a side protection double railing according to the invention in a three-dimensional illustration;

FIG. 3.1 shows the side protection double railing according to FIG. 2 in a two-dimensional plan view from the right;

FIG. 3.2 shows the side protection double railing according to FIG. 2 in a two-dimensional view from above;

FIG. 3.3 shows the side protection double railing according to FIG. 2 in a two-dimensional side view from the left;

FIG. 3.4 shows an enlarged detail in the region of the section, which is shown on the left in FIG. 3.2, of the side protection double railing;

FIG. 4.1 shows a view, which corresponds with FIG. 3.1, of the side protection double railing, wherein components of the two ladders are indicated schematically;

FIG. 4.2 shows a view, which corresponds with FIG. 3.2, of the side protection double railing, wherein components of the two ladders are indicated schematically;

FIG. 4.3 shows a view, which corresponds with FIG. 3.3, of the side protection double railing, wherein a detail of one of the two ladders is indicated schematically;

FIG. 4.4 shows a view, which corresponds with FIG. 3.4, of the side protection double railing, wherein a detail of one of the two ladders is indicated schematically;

FIGS. 5 to 7 show a mounting sequence during construction of the scaffold shown in FIG. 1;

FIG. 5 shows in a three-dimensional illustration a first mounting situation during the mounting of two side protection double railings in advance starting from a lower storey, wherein the two side protection double railings are disposed in an inclined intermediate mounting setting;

FIG. 6 shows in a three-dimensional illustration a second mounting situation in which the two side protection double railings are each mounted in advance in a use setting;

FIG. 7 shows a third mounting situation in which a further scaffolding floor downwardly bounding the next-higher storey is mounted, in which, by virtue of the two side protection double railings mounted in advance, protection against persons falling down from the further scaffolding floor is realised, before an engineer (not shown) climbs up to the said next-higher storey on the said further scaffolding floor.

DETAILED DESCRIPTION OF THE FIGURES

An example of embodiment of a scaffold according to the invention, which is configured as a mobile scaffold 10 and which is provided with side protection double railings 11 according to the invention mounted in advance, is shown in FIG. 1. The mobile scaffold 10 is constructed from a plurality of vertical ladders 12.1, 12.2; 13.1, 13.2, which can also be termed support frames. Each ladder 12.1, 12.2; 13.1, 13.2 comprises two parallel vertical struts 14.1, 14.2, 15.1, 15.2 as well as horizontal rungs 16; 16.1, 16.4, 16.5, 16.6; 16.6.5, 16.6.6; 16.7; 16.7.3, 16.7.4, 16.8; 16.8.1, 16.8.2, which connect these vertical struts and are each arranged perpendicularly to the vertical struts 14.1, 14.2, 15.1, 15.2, for the climbing up and/or climbing down of persons and/or for suspension of scaffolding floors 17.1, 17.2, 17.3, diagonal connecting elements 18 and/or horizontal connecting elements 19 and side protection double railings 11.

In the illustrated example of embodiment the mobile scaffold 10 is constructed with or on two travel bars 21. These are each formed substantially from a horizontal girder 22, each of which has at each end thereof an insertion tube 23 which is vertically upright in the installed state. The respective insertion tube 23 serves in each instance for reception of a foot 24 which is preferably settable in height. Each foot 24 comprises a mount 25 to which a customary parking roller 26 is fixed in usual manner. Vertical tubes 27 of a horizontal frame rod 31, which is also termed base tube, are plugged onto the insertion tubes 23 which here are at the back. This component keeps the two travel bars 21 together in the region of one of the ends of each bar. Under the horizontal girder 22 of each travel bar 21 a respective auxiliary rung 28 is secured to the respective travel bar 21 by means of two vertical rung holders 29. One or more horizontal scaffolding floors can be placed on the auxiliary rungs 28 and/or, as shown in the example of the lowermost scaffolding floor 17.1 in FIG. 1, detachably secured thereat preferably with the help of detent claws 30.

The length of the frame rod 31 or the horizontal spacing between the two vertical tubes 27 thereof determines the width of the mobile scaffold 10 on the respective longitudinal side thereof and/or the horizontal spacing of the ladders 12.1, 12.2; 13.1, 13.2 or the suspension spacing between two ladders 12.1, 12.2; 13.1, 13.2 of a storey 20.1, 20.2, 20.3, which is supported on the respective travel bar 21.

A lower or lowermost, here short, ladder 12.1, 12.2 stands by its respective two parallel, short vertical struts 14.1, 14.2 on each travel bar 21. Each short ladder 12.1, 12.2 has a number of rungs 16; 16.1, which is only half the number of the rungs 16 of the further, long ladders 13.1, 13.2 placed thereon. Each short ladder 12.1, 12.1 has four rungs 16. Each further, long ladder 13.1, 13.2 placed thereon has eight rungs 18. Accordingly, the installation height of the two lower or lowermost, short ladders 12.1, 12.2 is only half the installation height of the further, long ladders 13.1, 13.2 placed thereon. In the example of embodiment the installation height of the two lower or lowermost, short ladders 12.1, 12.2 is 100 cm. In the example of embodiment the installation height of the further, long ladders 13.1, 13.2 placed thereon is 200 cm. The two lower or lowermost, short ladders 12.1, 12.2 are associated with a lowermost or first storey 20.1.

The horizontal rungs 16 of each ladder 12.1, 12.2; 13.1, 13.2 are arranged at the same vertical rung vertical spacings 33 from one another. Within each ladder 12.1, 12.2; 13.1, 13.2 the rung vertical spacing 33 of the rungs 16 between one another is 25 cm in each instance. However, it will be evident that differently sized rung vertical spacings between the rungs can be provided within a ladder. This is particularly the case when the rungs do not serve or are not intended for the climbing up and/or climbing down of persons. One or more rungs or in a given case all rungs can be inclined or constructed with rung parts extending at an inclination.

The installation width of the ladders 12.1, 12.2; 13.1, 13.2 of the mobile scaffold 10 or the horizontal spacing of the vertical strut longitudinal axes of the respective two vertical struts 14.1, 14.2; 15.1, 15.2 of the respective ladders 12.1, 12.; 13.1, 13.2 in the illustrated example of embodiment is 75 cm. However, it will be evident that the installation width of the ladders or the horizontal spacing of the vertical struts thereof per ladder can also be smaller or greater.

A respective further vertical, long ladder 13.1, 13.2 is plugged by the long vertical struts 15.1, 15.2 thereof onto each of the lower or lowermost, short ladders 12.1, 12.2, which stand or are placed on the travel bars 21, or on the upper vertical strut ends of the short vertical struts 14.1, 14.2 thereof. This is such that the respective vertical planes, which are spanned by these further, long ladders 13.1, 13.2, coincide with the respective vertical planes spanned by the lower or lowermost, short ladders 12.1, 12.2 respectively arranged thereunder and supporting these. Consequently, the fitted further, long ladders 13.1, 13.2 of the now second storey 20.2 thus also have the same ladder horizontal spacing 34 from one another as the two short ladders 12.1, 12.2 of the lowermost or first storey 20.1. In the illustrated example of embodiment all fitted further, long ladders 13.1, 13.2 are of the same length or all bring about an installation height of equal size. The latter is here 200 cm. However, it will be obvious that the length or installation height can also be smaller or larger and/or that the length or installation height of further ladders or support frames can also be different.

A respective further horizontal scaffolding floor 17.1, 17.2 is detachably secured to the respective fourth rung 16.4, as seen from below, of each fitted long ladder 13.1, 13.2, preferably by means of detent claws 30.

In the case of the mobile scaffold 10 according to the illustrated example of embodiment the first scaffolding floor 17.1 of the first storey 20.1 and the second scaffolding floor 17.2 of the next-higher or second storey 20.2 are arranged at a vertical first scaffolding floor spacing from one another. This is here 212.5 cm. By contrast thereto, the second scaffolding floor 17.2 of the second storey 20.2 and the next-higher third scaffolding floor 17.3, which is arranged thereabove, of the third storey 20.3 are arranged at a second vertical scaffolding floor spacing. This is here 200 cm. This second scaffolding floor spacing is also kept for possible further, respectively next-higher, scaffolding floors.

For preference, all scaffolding floors 17.1, 17.2, 17.3, at least the scaffolding floors 17.2, 17.3 of the second storey 20.2 and each further storey 20.3 following thereupon in upward direction, are secured to rungs 16 of the ladders 12.1, 12.2; 13.1, 13.2 with the help of detent claws 30 to be releasable again. Each scaffolding floor 17.1, 17.2, 17.3 is secured to two associated rungs 16, which with reference to the respective scaffolding floor 17.1, 17.2, 17.3 are arranged on a rung, which has approximately the same rung height, of the respective ladder 12.1, 12.2, 13.1, 13.2. The same also applies in principle to the lowermost or first scaffolding floor 17.1. However, this can be deposited only on the auxiliary rungs 28 or only on the rungs 16 of the lowermost ladders 12.1, 12.2 and can thus also be constructed as a scaffolding board, for example wooden board.

In the illustrated example of embodiment the mobile scaffold 10 is constructed with in total three storeys 20.1, 20.2, 20.3 each with three tiers or levels, which are each formed by a respective scaffolding floor 17.1, 17.2, 17.3. The lowermost or first storey 20.1 is delimited by the lowermost or first scaffolding floor 17.1, by the associated two short ladders 12.1, 12.2 and by parts of the long ladders 13.1, 13.2 respectively placed on the short ladders 12.1, 12.2. The next-higher or second storey 20.2 is delimited by the next-higher or second scaffolding floor 17.2, by the associated two long ladders 13.1, 13.2 and by parts of the further two, long ladders 13.1, 13.2 respectively placed on the two short ladders 12.1, 12.2. The further two, long ladders 13.1, 13.2 also delimit the third, here uppermost, storey 20.3, which is delimited downwardly 64 by the third scaffolding floor 17.3.

Two diagonals 18 are mounted in each storey 20.1, 20.2, 20.3 for stiffening of the mobile scaffold 10. These diagonals are here each arranged crossed or crosswise per storey 20.1, 20.2, 20.3. All diagonals 18 have at the two ends thereof respective detent claws 30. In the lowermost or first storey 20.1 the respective diagonal 18 is detachably secured to a lowermost rung 16.1 of the respective lowermost, short ladder 12.1, 12.2 and to the respective fourth rung 16.4, as seen from below, of the oppositely installed long ladder 13.1, 13.2, which is respectively placed on the other short ladder 12.1. Two diagonals 17 are similarly mounted in the second storey 20.2. Each of these diagonals 18 is detachably secured to a fifth rung 16.5, as seen from below, of the associated further, long ladder 13.1, 13.2 and to a fourth rung 16.4, as seen from below, of the associated opposite further, long ladder 13.1, 13.2, which is placed on the long ladder 13.1, 13.2 disposed thereunder. The mobile scaffold 10 is in this mode and manner sufficiently stiffened against tilting and/or twisting.

The mobile scaffold 10 shown in FIG. 1 is similar in its construction, with the exception of the side protection double railing 11, to the mobile scaffold shown in FIG. 37 of EP 2 175087 A1 and described in the associated description of figures. The mobile scaffold 10 shown in FIG. 1 can be installed or assembled in a mode and manner similar to how illustrated in FIGS. 25 to 37 of EP 2 175 087 A1 and described in the associated description of figures. By contrast to the railing elements, which are shown and described in EP 2 175 087 A1 and which are individual rod elements with straight struts, in the case of the mobile scaffold 10 according to the invention, for example according to FIG. 1, use is made of special side protection double railings 11 according to the invention. These side protection double railings 11 can be mounted in advance in a mode and manner similar to how shown and described in EP 2 175 087 A1 by way of the rod-shaped railing elements used therein. In the example of embodiment of the mobile scaffold 10 shown in the present FIGS. 1 and 5 to 7, mounting of the side protection double railings 11 in advance is carried out with use of ladder suspension devices 32, which are configured and usable similarly to those support frame suspension devices shown in FIGS. 47 to 49 of EP 2 175 087 A1 and described in the associated description of figures.

The functions of the ladder suspension devices 32 shown in the present FIGS. 1 and 5 to 7 correspond with the functions of the said support frame suspension devices.

It will be obvious that a mobile scaffold 10 according to the invention can, with the exception of the side protection double railings 11, also be similar to, for example, the mobile scaffold shown in FIG. 14 of EP 2 175 087 A1 and described in the associated description of figures, and also installed or assembled in a mode and manner similar to how illustrated in FIGS. 1 to 14 of EP 2 175 087 A1 and described in the associated description of figures. Accordingly, by contrast with the mobile scaffold 10 according to FIGS. 1 and 5 to 7 of the protective right under discussion here, there can also be installed a respective long ladder as each lowermost ladder instead of the respective short ladder. It will further be obvious that a mobile scaffold according to the invention can, with the exception of the side protection double railing 11, also be similar with respect to its construction to the mobile scaffold shown in FIG. 51 of EP 2 175 087 A1 and described in the associated description of figures.

The invention relates to a scaffold, particularly a mobile scaffold 10, which is constructed with at least two vertical ladders 13.1, 13.2, with at least one horizontal scaffolding floor 17.1, 17.3 and with at least one side protection railing 11 for protection of persons against falling down from the scaffolding floor 17.1, 17.2. Each ladder 13.1, 13.2 of the least two ladders 13.1, 13.2 comprises at least two parallel vertical struts 15.1, 15.2 and a plurality of preferably parallel rungs 16. The rungs 16 each extend between a first vertical strut 15.1 and a second vertical strut 15.2 of the at least two vertical struts 15.1, 15.2 of the respective ladder 13.1, 13.2 at rung vertical spacings 33 from one another. The rung vertical spacings 33 are preferably the same. The rungs 16 are each fixedly connected, preferably rigidly, with the first vertical strut 15.1 and the second vertical strut 15.2 of the respective ladder 13.1, 13.2. A vertical first ladder 15.1 and a vertical second ladder 15.2 of the at least two ladders 15.1, 15.2 are vertically erected at a ladder horizontal spacing 34 to be substantially parallel to one another. The at least one scaffolding floor 17.2, 17.3 extends between the first ladder 15.1 and the second ladder 15.2 and is detachably secured to both the first ladder 15.1 and the second ladder 15.2. At least one side protection double railing 11 mountable in advance or mounted in advance is detachably secured to the first ladder 15.1 and to the second ladder 15.2. Two side protection double railings 11 preferably of the same design are preferably detachably secured to each ladder 15.1, 15.2 at a horizontal side protection double railing spacing from one another (see FIG. 1).

Each side protection double railing 11 extends between a first ladder 13.1 and a second ladder 13.2. The or each side protection double railing 11 comprises an upper strut 35, a lower strut 36 and a plurality of connecting struts, preferably one or more transverse struts 37.1, 37.2, 37.3 and/or one or more diagonal struts, which are each fixedly connected, preferably rigidly, with the lower strut 36 and with the upper strut 35. In the mobile scaffold assembled to finished state the upper strut 35 of the or each side protection double railing 11 extends above the at least one horizontally arranged scaffolding floor 17.2, 17.3 and the lower strut 36 extends at least partly or substantially or, as shown in FIG. 1, entirely above the at least one scaffolding floor 17.2, 17.3. In the illustrated example of embodiment, three parallel transverse struts 37.1, 37.2, 37.3 arranged at the same spacings from one another are provided as connecting struts. The three transverse struts 37.1, 37.2, 37.3 each extend between the upper strut 35 and a lower strut middle part 38 of the lower strut 36 of the side protection double railing 11, in each instance perpendicularly to the upper strut longitudinal axis 39 of the upper strut 35 and perpendicularly to the lower strut middle part longitudinal axis 40 of the lower strut middle part 38 of the lower strut 36.

The upper strut 35 of the or each side protection double railing 11 has a first upper strut end 41.1 with a first upper strut suspension unit 42.1 and with a first upper strut suspension claw 43.1, which preferably has a U-shaped or semicircular or J-shaped cross-section. The first upper strut suspension claw 43.1 has first upper strut suspension claw sides 44.1, 44.2 which face away from one another preferably in opposite directions, and is open towards the first upper strut suspension claw sides 44.1, 44.2 and downwardly 64 in a first plug-on direction 45.1 or towards the lower strut 36. The upper strut 35 is detachably secured by means of its first upper strut suspension claw 43.1 to a first—here uppermost—rung 16.8.1 of the rungs 16 of the first ladder 13.1 to be pivotable in a vertical first pivot plane relative to the first ladder 13.1.

The upper strut 35 of the or each side protection double railing 11 has a second upper strut end 41.2, which extends away from the first upper strut end 41.1, preferably in an opposite direction, with a second upper strut suspension unit 42.2 with a second upper strut suspension claw 43.2 preferably having a U-shaped or semicircular or J-shaped cross-section. The second upper strut suspension claw 43.2 has second upper strut suspension claw sides 46.1, 46.2, which face away from one another preferably in opposite directions, and is open towards its second upper strut suspension claw sides 46.1, 46.2 and downwardly 64 in a second plug-on direction 45.2 parallel to the first plug-on direction 45.1 or towards the lower strut 36. The upper strut 35 is detachably secured by means of the second upper strut suspension claw 43.2 to a second—here uppermost—rung 16.8.2 of the rungs 16 of the second ladder 13.2 to be pivotable in a vertical second pivot plane relative to the second ladder 13.2. The first upper strut suspension unit 42.1 and the second upper strut suspension 42.2 have the same configuration.

The upper strut 35 of the or each side protection double railing 11 has an upper strut length 48 greater than a first rung horizontal spacing 49.1 which the first rung 16.8.1 of the first ladder 13.1 and the second or uppermost rung 16.8.2, which is arranged at substantially the same first height as the first or uppermost rung 16.8.1 of the first ladder 13.1, of the second ladder 13.2 have from one another. The upper strut 35 of the or each side protection double railing 11 engages, at least in the region of the first upper strut end 41.1 thereof, which is arranged directly above the first, uppermost rung 16.8.1 of the first ladder 13.1, over the first or uppermost rung 16.8.1 of the first ladder 13.1 and engages at least in the region of the second upper strut end 41.1 thereof, which is arranged directly above the second or uppermost rung 16.8.2 of the second ladder 13.2, over the second or uppermost rung 16.8.2 of the second ladder.

The lower strut 36 of the or each side protection double railing 11 has a lower strut length 50 which is greater than a second rung horizontal spacing 49.2, which corresponds with the first rung horizontal spacing 49.1, which a third rung 16.7.3 of the rungs 16 of the first ladder 13.1 and a fourth rung 16.7.4, which is arranged at substantially the same second height as the third rung 16.7.3 of the first ladder 13.1, of the rungs 16 of the second ladder 13.2 have. The third rung 16.7.3 of the first ladder 13.1 is arranged at a first rung vertical spacing 33 below the first or uppermost rung 16.8.1 of the first ladder 13.1, preferably on the first or uppermost rung 16.8.1 next-following downwardly 64. The fourth rung 16.7.4 of the second ladder 13.2 is arranged at a second rung vertical spacing 33, which preferably corresponds with the first rung vertical spacing 33, below the second rung 16.8.2 of the second ladder 13.2, preferably on the second rung 16.8.2 next-following downwardly 64. In other words, the third rung 16.7.3 of the first ladder 13.1 is preferably the rung 16, which downwardly 64 next follows the first or uppermost rung 16.8.1 of the first ladder 13.1, of the first ladder 13.1 and the fourth rung 16.7.4 of the second ladder 13.2 is preferably the rung 16, which downwardly 64 next follows the second or uppermost rung 16.8.2 of the second ladder 13.2, of the second ladder 13.2.

The lower strut 36 of the or each side protection double railing 11 has a first lower strut end 51.1 and a second lower strut end 51.2 which extends away therefrom preferably in an opposite direction. The lower strut 36 of the or each side protection double railing 11 engages at least in a region of the first lower strut end 51.1 thereof, which is arranged directly below the third rung 16.7.3 of the first ladder 13.1, under the third rung 16.7.3 of the first ladder 13.1 and engages at least in the region of the second lower strut end 51.2 thereof, which is arranged directly below the fourth rung 16.7.4 of the second ladder 13.2, under the fourth rung 16.7.4 of the second ladder 13.2.

According to the invention the upper strut 36 of the side protection double railing 11 at least in the region of the first upper strut end 41.1 thereof and at least in the region of the second upper strut end 41.2 thereof as well as the lower strut 36 of the side protection double railing 11 at least in the region of the first lower strut end 51.1 thereof and at least in the region of the second lower strut end 51.2 thereof and the first rung 16.8.1 and the third rung 16.7.3 of the first ladder 13.1 as well as the second rung 16.8.2 and the fourth rung 16.7.4 of the second ladder 13.2 are so configured and arranged in adaptation to one another that the side protection double railing 11 is not capable of demounting without demounting of the first ladder 13.1 or the second ladder 13.2.

The upper strut 35 and the lower strut 36 of the side protection double railing 11 at least in the region of the first upper strut end 41.1 and at least in the region of the first lower strut end 51.1 thereof have a first strut vertical spacing 52.1 from one another only slightly larger than the first rung vertical spacing 33. The upper strut 35 of the side protection double railing 11 at least in the region of the second upper strut end 41.2 thereof and the lower strut 36 of the side protection double railing 11 in the region of the second lower strut end 51.2 thereof have a second strut vertical spacing 52.2 from one another only slightly larger than the second rung vertical spacing 33. With particular preference the first strut vertical spacing 52.1 is configured to be matched to the first rung vertical spacing 33 in such a way that the first upper strut suspension claw 43.1 can be lifted upwardly 63 at most to such an extent from the first rung 16.8.1 of the first ladder 13.1 that the first upper strut suspension claw 43.1 is not removable from the first rung 16.8.1 of the first ladder 13.1. Moreover, the second strut vertical spacing 52.2 is configured to be matched to the second rung vertical spacing 33 in such a way that the second upper strut suspension claw 43.2 can be lifted upwardly 63 at most to such an extent from the second rung 16.8.2 of the second ladder 13.2 that the second upper strut suspension claw 43.2 is not removable from the second rung 16.8.2 of the second ladder 13.2.

The first lower strut end 51.1 of the lower strut 36 extends in a first space 53.1 which is bounded by two directly successive rungs 16, namely here the third rung 16.7.3 of the first ladder 13.1 and the rung 16.6.5, which next follows this downwardly 64, of the first ladder 13.1 and by the associated two vertical struts 15.1, 15.2 of the first ladder 13.1, and the second lower strut end 51.2 of the lower strut 36 extends in a second space 53.2 bounded by two directly successive rungs 16, namely here the fourth rung 16.7.4 of the second ladder 13.2 and the rung 16.6.6, which next follows this downwardly 64, of the second ladder 13.2 and by the associated two vertical struts 51.1, 15.2 of the second ladder 13.2.

The lower strut 36 has between the two lower strut ends 51.1, 51.2 thereof the lower strut middle part 38 containing a lower strut centre 54 of the lower strut 36. The lower strut middle part 38 has lower strut middle part ends 55.1, 55.2 facing away from one another in opposite directions. From each lower strut middle part end 55.1, 55.2 a lower strut part 56.1, 56.2 of the lower strut 36 is cranked in a first transverse direction 62.1 towards the upper strut 35 and cranked in a second transverse direction 62.2 away from the respective upper strut end 41.1, 41.2 of the upper strut 35 or towards the respectively associated vertical strut 15.1 or 15.2 of the first and second ladders 13.1, 13.2. The lower strut 36 has in the region of each of the two lower strut ends 51.1, 51.2 thereof a respective lower strut end part 57.1, 57.2 which is respectively cranked over from the lower strut middle part 38 in three directions.

The upper strut 35 of the or each side protection double railing 11 extends substantially rectilinearly along the upper strut longitudinal axis 39 thereof. The upper strut 35 has a rectilinearly extending upper strut rod element 58 which is preferably tubular and which is connected with the first upper strut suspension unit 42.1 or secured to the first upper strut suspension unit 42.1. The upper strut rod element 58 has a first upper strut rod element end 59.1 and a second upper strut rod element end 59.2, which extends away therefrom in an opposite direction and along the upper strut longitudinal axis 39 of the upper strut 35 and which is connected with the second upper strut suspension unit 42.2 or secured to the second upper strut suspension unit 42.2.

The lower strut middle part 38 extends rectilinearly along the lower strut middle part longitudinal axis 40 thereof parallel to the upper strut longitudinal axis 39 of the upper strut 35. The upper strut longitudinal axis 39 extends in a notional first plane 60.1 containing the lower strut middle part longitudinal axis 40 of the lower strut middle part 38. In the state of the or each side protection double railing 11 installed in accordance with intention, the or the respective first plane is a first vertical plane 60.1.

Each lower strut end part 57.1, 57.2 of the lower strut 36 of the or the respective side protection double railing 11 extends rectilinearly along a respective lower strut end part longitudinal axis 61.1, 61.2. Each lower strut end part longitudinal axis 61.1, 61.2 extends parallelly to the lower strut middle part longitudinal axis 40 of the lower strut middle part 39. In that case each lower strut end part 57.1, 57.2 or the respective lower strut end part longitudinal axis 61.1, 61.2 thereof is arranged to be offset upwardly 63 with respect to the lower strut middle part longitudinal ais 40 and towards a first side, particularly towards a front side or outer side 65 of the or the respective side protection double railing 11 or outwardly 66. Each lower strut end part 57.1, 57.2 is arranged to be laterally offset with respect to the lower strut middle part 38 in a fifth transverse direction 62.5 towards the directly associated vertical strut 15.1, 15.2 of the associated ladder 13.1, 13.2 or outwardly 66.

With particular preference the first lower strut end 51.1 of the lower strut 36 has a first lower strut securing unit 70.1 with a first lower strut claw 71.1, which has a preferably U-shaped or semicircular or J-shaped cross-section, for reception of the first or second vertical strut 15.1, 15.2 of the first ladder 13.1 and with a first locking element 72.1 for locking the first lower strut claw 71.1 to an associated vertical strut 15.1, 15.2 of the first ladder 13.1, 13.2. The second lower strut end 51.2 of the lower strut 36 has a second lower strut securing unit 70.2 with a second lower strut claw 71.2, which has a preferably U-shaped or semicircular or J-shaped cross-section, for reception of the first or second vertical strut 15.1, 15.2 of the second ladder 13.2 and with a second locking element 72.2 for locking the second lower strut claw 71.2 to an associated vertical strut 15.1, 15.2 of the second ladder 13.2.

The first lower strut claw 71.1 has first lower strut claw sides 71.1.1, 71.1.2 facing away from one another in opposite directions and is open towards its first lower strut claw sides 71.1.1, 71.1.2 and in a fifth plug-on direction 45.5 towards the outer side 65 of the side protection double railing 11. The second lower strut claw 71.2 has second lower strut claw sides 71.2.1, 71.2.2 facing away from one another in opposite directions and is open towards its second lower strut claw sides 71.2.1, 71.2.2 and in a sixth plug-on direction 45.6 parallel to the fifth plug-on direction 45.2 towards the same outer side 65 of the side protection double railing 11.

The first locking element 72.1 is transferrable automatically or by manual actuation, preferably against the spring force of a first spring (not shown), particularly during plugging onto the associated vertical strut 15.1, 15.2, to a first open setting (not shown) in which the first lower strut claw 71.1 can be plugged in the fifth plug-on direction 45.5 onto the associated vertical strut 15.1, 15.2 of the first ladder 13.1 or in which the first lower strut claw 71.1 is removable from the associated vertical strut 15.1, 15.2 of the first ladder 13.1 and transferrable, preferably produced by a spring restoring force of the spring (not shown) or by manual actuation or under gravitational force, from the first open setting (not shown) to a first locking setting 76.1 in which the first lower strut claw 71.1 is mechanically positively lockable to the associated vertical strut 15.1, 15.2 against removal from the associated vertical strut 15.1, 15.2.

The first lower strut claw 71.1 is detachably secured to the associated vertical strut 15.1, 15.2 of the first ladder 13.1 by means of the first locking element 72.1 disposed in its first locking setting 76.1 and mechanically positively locked with the associated vertical strut 15.1, 15.2 against removal therefrom. The second locking element 72.2 is transferrable automatically or by manual actuation, preferably against the spring force of a second spring (not shown), particularly during plugging onto the associated vertical strut 15.1, 15.2, to a second open setting (not shown) in which the second lower strut claw 71.2 can be plugged in the sixth plug-on direction 45.6 onto the associated vertical strut 15.1, 15.2 of the second ladder 13.2 or in which the second lower strut claw 71.2 is removable from the associated vertical strut 15.1, 15.2 of the second ladder 13.2 and transferrable, preferably produced by a spring restoring force of the second spring (not shown) or by manual actuation or under gravitational force, from the second open setting (not shown) to a second locking setting 76.2 in which the second lower strut claw 71.2 is mechanically positively lockable to the associated vertical strut 15.1, 15.2 against removal from the associated vertical strut 15.1, 15.2. The second lower strut claw 71.2 is detachably secured to the associated vertical strut 15.1, 15.2 of the second ladder 13.1 by means of the second locking element 72.2 disposed in its second locking setting 76.1 and mechanically positively locked to the associated vertical strut 15.1, 15.2 against removal therefrom.

According to the invention the first lower strut claw 71.1 of the first lower strut securing unit 70.1 is open in the fifth plug-on direction 45.5 perpendicularly to the first plug-on direction 45.1, in which the first upper strut suspension claw 43.1 of the first upper strut suspension unit 42.1 is open downwardly 64 or towards the lower strut 36 and the second lower strut claw 71.2 of the second lower strut securing unit 70.2 is open in the sixth plug-on direction 45.6 perpendicularly to the second plug-on direction 45.2, in which the second upper strut suspension claw 43.2 of the second upper strut suspension unit 42.2 is open downwardly 64 or towards the lower strut 36. In other words, the first lower strut claw 71.1 open in the fifth plug-on direction 45.1 is arranged to be turned at a first angle 77.1 of 90 degrees about the upper strut longitudinal axis 39 of the upper strut 35 relative to the first open upper strut suspension claw 43.1 open downwardly 64 in the first plug-on direction 45.1 or towards the lower strut 36 and the second lower strut claw open in the sixth plug-on direction 45.6 is arranged to be turned at a second angle of 90 degrees about the upper strut longitudinal axis 39 of the upper strut 35 relative to the second upper strut suspension claw 43.2 open downwardly 64 in the second plug-on direction 45.2 or towards the lower strut 36.

The first lower strut securing unit 70.1 and the second lower strut securing unit 70.2 are of the same design. Preferably the first and second lower strut securing units 70.1, 70.2 of the lower strut 36 are each a detent claw which is known per se, preferably such as illustrated and described in DE 38 22 215 A1 and in the parallel EP 0 348 885 A2.

In the example of embodiment shown in the figures, the first and second upper strut suspension units 42.1, 42.2 of the upper strut 35 are each a suspension claw 43.1; 43.2 which is known per se. These suspension claws 43.1, 43.2 thus do not have any locking means for locking to a strut or rung at which the respective suspension claw 43.1, 43.2 can be detachably suspended or is detachably suspended.

The upper strut length 48 of the upper strut 35 is preferably the same as the lower strut length 50 of the lower strut 36.

According to an example of embodiment (not shown in the figures) the first upper strut suspension unit or the first upper strut end of the upper strut can comprise, additionally to the respective upper strut suspension claw, a fifth locking element for locking the first upper strut suspension claw to the first rung of the first ladder and the second upper strut suspension unit or the second upper strut end of the upper strut can comprise a sixth locking element for locking the second upper strut suspension claw to the second rung of the second ladder. The fifth locking element and the sixth locking element can be transferrable automatically or by manual actuation, preferably against the spring force of a spring, particularly during plugging onto the respective rung, to an open setting in which the respective upper strut suspension claw can be plugged in the respective plug-on direction onto the respectively associated rung of the respective ladder and transferrable, preferably produced by a spring restoring force of the spring or by manual actuation or under gravitational force, from the open setting to a locking setting in which the respective upper strut suspension claw is locked to the respectively associated rung against removal from the respective rung. In this case the first and second upper strut suspension units of the lower strut are preferably each an upper strut securing unit, preferably each in the form of a detent claw known per se, for example such as illustrated and described in DE 38 22 215 A1 and in the parallel EP 0 348 885 A2. In just this case it can preferably be provided that the first lower strut securing unit, the second lower strut securing unit, the first upper strut suspension unit and the second upper strut suspension unit are respectively of the same design.

The method for assembling the scaffold according to the invention, for example the mobile scaffold 10 shown in the figures, differs from the alternative assembly procedure with which EP 2 175 087 A1 is concerned substantially in that in accordance with the invention the or the respective side protection double railing 11 is appropriately mounted in advance instead of the individual straight railing elements.

According to a preferred variant of the assembly method in conjunction with a particularly preferred embodiment of the side protection double railing 11, in which the respective lower strut securing unit 70.1, 70.2 is provided with a locking element for locking the respective lower strut claw 71.1, 71.2 of the respective lower strut securing unit 70.1, 70.2 to the respectively associated vertical strut 15.1, 15.2 of the respectively associated ladder 13.1, 13.2 against unintended lifting-off or removal of the lower strut 36 from the respectively associated ladder 13.1, 13.2, it can be provided that after the or the respective side protection double railing 11 has been mounted in advance from a lower level or storey 20.1 or 20.2 and after, preferably consecutively, at least one scaffolding floor 17.2, 17.3 has been mounted in a next-higher level or storey 20.2 or 20.3 at a vertical spacing, preferably of approximately 100 cm, below the or the respective upper strut 35 of the or the respective side protection double railing 11, the first and second lower strut securing units 70.1, 70.2 of the lower strut 36 are connected with the associated vertical struts 15.1, 15.2 of the respectively associated ladder 13.1, 13.2 in such a way that the first and second lower strut claws 71.1, 71.2 of the first and second lower strut securing units 70.1, 70.2 and accordingly the lower strut 36 are mechanically positively locked to the associated vertical struts 15.1, 15.2 of the respectively associated ladders 13.1, 13.2 and according to these ladders 13.1, 13.2. The scaffold or mobile scaffold 10 can thereby be simply and securely assembled or disassembled and the thus-assembled scaffold or mobile scaffold 10 has a greater degree of stability and offers a greater degree of security against being caught and against the falling-down of persons than in the case of the constructions according to the prior art.

In the illustrated example of embodiment the mobile scaffold 10 is constructed on the basis of a constructional unit with at least four ladders 12.1, 12.2, 13.1, 13.2 or 13.1, 13.2, 13.1, 13.2. Of these four ladders 12.1, 12.2, 13.1, 13.2 or 13.1, 13.2, 13.1, 13.2 in each instance two ladders 12.1, 12.2 or 13.1, 13.2 are associated with a lower or lowermost storey 20.1 or 20.2, whilst the other two ladders 13.1, 13.2 are associated with a next-higher storey 20.2 or 20.3. In that case, in each instance two of the ladders 12.1, 12.2, 13.1, 13.2 or 13.1, 13.2, 13.1, 13.2 are installed one above the other, preferably plugged one onto the other. However, it will be understood that a mobile scaffold according to the invention can also be constructed on the basis of constructional units with only three ladders, in certain circumstances even with only two ladders. In the case of a constructional unit formed from three ladders, two ladders thereof are installed one above the other, preferably plugged one onto the other, whilst the third ladder is installed at a horizontal ladder spacing from the two other ladders. In the case of a constructional unit formed from only two ladders, these ladders are installed at a horizontal ladder spacing from one another.

At least the second and each further storey 20.2, 20.3 of the mobile scaffold 10 are secured, towards their respective longitudinal sides or outer sides 73.1, 73.2 of the mobile scaffold 10, by here two respective side protection double railings 11 according to the invention in such a way that a person standing on the scaffolding floor 17.1, 17.3 to be safeguarded or on the scaffolding floors 17.1, 17.3 to be safeguarded of these storeys 20.2, 20.3 is safeguarded against falling down. The respective upper strut 35 of the respective side protection double railing 11 forms a hip or back protective railing or a handrail.

The side protection double railings 11, which are at the mobile scaffold 10, of the respective storeys 20.2, 20.3 or levels are respectively arranged at a horizontal side protection double railing spacing 74 from one another laterally adjacent to one another at substantially the same height. All side protection double railings 11 are preferably of the same construction.

The or each side protection double railing 11 extends along a side protection double railing longitudinal axis 46 of the side protection double railing 11. The or each side protection double railing 11 is formed to be mirror-symmetrical with respect to a side protection double railing longitudinal centre plane 47 of symmetry. The side protection double railing longitudinal centre plane 47 of symmetry is preferably formed perpendicularly to the side protection double railing longitudinal axis 46 and/or perpendicularly to the upper strut longitudinal axis 30 and/or perpendicularly to the lower strut middle part longitudinal axis 40 and can include the lower strut centre 54.

For preference further safety means, here in the form of toe boards 78.1, 78.2, are preferably provided at least in the uppermost storey 20.3 or level of the mobile scaffold 10. These are vertically arranged directly adjacent to the uppermost scaffolding floor 17.3 provided thereat and respectively extend between adjacent vertical struts 15.1, 15.2 of the ladders 13.1, 13.2 bounding the uppermost storey 20.3 or level. In the illustrated example of embodiment in each instance two directly adjacent or mutually adjoining/abutting toe boards 78.1, 78.2 are arranged perpendicularly to one another.

The invention is not limited to the advantageous examples of embodiment shown in the figures. The examples of embodiment described in the foregoing can also be implemented in a different manner from the exemplifying figures. The reference numerals used in the description of the figures and in the following claims do not limit the scope of protection of the invention. The claws mentioned in this protective right can also be termed hooks.

REFERENCE SYMBOL LIST

• • 10 scaffold/mobile scaffold
  • 11 side protection railing/side protection double railing
  • 12.1 (short) ladder (in first storey)
  • 12.2 (short) ladder (in first storey)
  • 13.1 (long) ladder (in second and third storeys)
  • 13.2 (long) ladder (in second and third storeys)
  • 14.1 (short) vertical strut
  • 14.2 (short) vertical strut
  • 15.1 (long) vertical strut
  • 15.2 (long) vertical strut
  • 16 rung
  • 16.1 rung (lowermost rung or first rung from below)
  • 16.4 rung (fourth rung from below)
  • 16.5 rung (fifth rung from below)
  • 16.6 rung (sixth rung from below)
  • 16.6.5 rung (of the first ladder)
  • 16.6.6 rung (of the second ladder)
  • 16.7 rung (seventh rung from below)
  • 16.7.3 third rung (of the first ladder)
  • 16.7.4 fourth rung (of the second ladder)
  • 16.8 rung (uppermost rung or eighth rung from below)
  • 16.8.1 first (uppermost) rung (of the first ladder)
  • 16.8.2 second (uppermost) rung (of the second ladder)
  • 17.1 (first) scaffolding floor (of the first storey)
  • 17.2 (second) scaffolding floor (of the second storey) with climb-through hatch and folding cover
  • 17.3 (third) scaffolding floor (of the third storey) with climb-through hatch and folding cover
  • 18 diagonal connecting element/diagonals
  • 19 horizontal connecting element
  • 20.1 (first) storey
  • 20.2 (second) storey
  • 20.3 (third) storey
  • 21 travel bar
  • 22 horizontal girder (of 21)
  • 23 insertion tube
  • 24 foot
  • 25 mount
  • 26 parking roller
  • 27 vertical tube
  • 28 auxiliary rung
  • 29 rung holder
  • 30 detent claw
  • 31 frame rod/base tube
  • 32 ladder suspension device
  • 33 rung vertical spacing (between each two rungs)
  • 34 ladder horizontal spacing (between two horizontally adjacent ladders)
  • 35 upper strut
  • 36 lower strut
  • 37.1 connecting strut/transverse strut
  • 37.2 connecting strut/transverse strut
  • 37.3 connecting strut/transverse strut
  • 38 lower strut middle part
  • 39 upper strut longitudinal axis
  • 40 lower strut middle part longitudinal axis
  • 41.1 (first) upper strut end
  • 41.2 (second) upper strut end
  • 42.1 (first) upper strut suspension unit
  • 42.2 (second) upper strut suspension unit
  • 43.1 (first) (upper strut) suspension claw
  • 43.2 (second) (upper strut) suspension claw
  • 44.1.1 (first) upper strut suspension claw side (of 43.1)
  • 44.1.2 (second) upper strut suspension claw side (of 43.1)
  • 44.2.1 (first) upper strut suspension claw side (of 43.2)
  • 44.2.2 (second) upper strut suspension claw side (of 43.2)
  • 45.1 (first) plug-on direction
  • 45.2 (second) plug-on direction
  • 45.5 (fifth) plug-on direction
  • 45.6 (sixth) plug-on direction
  • 46 side protection double railing longitudinal axis
  • 47 side protection double railing longitudinal centre plane of symmetry
  • 48 upper strut length
  • 49.1 (first) rung horizontal spacing
  • 49.2 (second) rung horizontal spacing
  • 50 lower strut length
  • 51.1 (first) lower strut end
  • 51.2 (second) lower strut end
  • 52.1 (first) strut vertical spacing (from 41.1 to 51.1)
  • 52.2 (second) strut vertical spacing (from 41.2 to 51.2)
  • 53.1 (first) space
  • 53.2 (second) space
  • 54 lower strut centre
  • 55.1 (first) lower strut middle part end
  • 55.2 (second) lower strut middle part end
  • 56.1 (first) lower strut part
  • 56.2 (second) lower strut part
  • 57.1 (first) lower strut end part
  • 57.2 (second) lower strut end part
  • 58 upper strut rod element
  • 59.1 (first) upper strut rod element end
  • 59.2 (second) upper strut rod element end
  • 60.1 (first) plane/(first) vertical plane (FIG. 3.3)
  • 61.1 (first) lower strut end part longitudinal axis
  • 61.2 (second) lower strut end part longitudinal axis
  • 62.1 (first) transverse direction
  • 62.2 (second) transverse direction
  • 62.5 (fifth) transverse direction
  • 63 upwardly
  • 64 downwardly
  • 65 front side/outer side of 11
  • 66 outwardly
  • 70.1 (first) lower strut securing unit
  • 70.2 (second) lower strut securing unit
  • 71.1 (first) lower strut claw
  • 71.1.1 (first) lower strut claw side (of 71.1)
  • 71.1.2 (second) lower strut claw side (of 71.1)
  • 71.2 (second) lower strut claw
  • 72.2.1 (first) lower strut claw side (of 71.2)
  • 71.2.2 (second) lower strut claw side (of 71.2)
  • 72.1 (first) locking element/(first) locking latch
  • 72.2 (second) locking element/(second) locking latch
  • 73.1 (first) longitudinal side/outer side (of 10)
  • 73.2 (second) longitudinal side/outer side (of 10)
  • 74 (horizontal) side protection double railing spacing (of 11-11)
  • 76.1 (first) locking setting of 72.1 (FIG. 4.2+4.4)
  • 76.2 (second) locking setting of 72.2 (FIG. 4.2)
  • 77.1 (first) angle (90 degrees)
  • 78.1 toe board (short)
  • 78.2 toe board (long)