FOLDABLE HEIGHT-INCREASING STOOL WITH BACKREST

Description

CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims the priority of Chinese patent application No. 2024224567427, filed on Oct. 11, 2024, and contents of which are incorporated herein by reference.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention belongs to the technical field of stools, and in particular, relates to a foldable height-increasing stool with a backrest.

Description of Related Art

A stool is an article commonly used at home or when going out, for example, when people travel, take a train, or stand in a queue for a long time, people often need to sit for rest, and in order to reduce occupied space, people usually carry a foldable stool with them.

In the prior art, a common foldable stool adopts a telescopic structure, the stool includes a base and a stool panel located above the base. A split load-bearing ring is provided between the base and the stool panel. The load-bearing ring is not less than two layers, and the load-bearing rings are nested in pairs. Adjacent load-bearing rings are vertically slidably connected, the innermost load-bearing ring is connected to the stool panel by a buckle, and the outermost load-bearing ring is connected to the base by a buckle. However, the above foldable stool has the following technical defects:

After the stool is unfolded, people can sit above the stool panel to rest, but because there is no backrest function, muscles are always in a tense state during long-term sitting, which will increase a load on a lumbar spine, easily cause low back pain, muscle strain and fasciitis, and more easily produce fatigue.

Connection stability between adjacent load-bearing rings is an important indicator that tests load-bearing capacity. Although the existing foldable stool is provided with a plurality of sliding buckles in the circumference of the load-bearing rings, the buckles are not densely designed and load-bearing capacity is average.

The stool panel is generally a straight panel or a cushion, but if sitting for a long time, buttocks are less comfortable.

In a folding process, a plurality of load-bearing rings need to be pressed down at the same time, which is relatively laborious.

SUMMARY OF THE INVENTION

In order to solve the problems, the present invention provides a foldable height-increasing stool with a backrest.

The technical scheme adopted by the present invention is: a foldable height-increasing stool with a backrest, including:

• • a base;
  • a lifting assembly mounted above the base and including a plurality of load-bearing rings nested and assembled sequentially from outside to inside, a lifting locking structure being provided between the adjacent load-bearing rings;
  • a stool panel mounted above the lifting assembly; and
  • a backrest rotatably mounted at a rear end of the stool panel and having a stowed state abutting against an upper portion of the stool panel, and a use state of pivoting upward away from the stool panel, in the use state, a positioning structure that cooperates to fix a position of the backrest being provided between the backrest and the stool panel, in which
  • the lifting locking structure has a locking position and an unlocking position, and is switched therebetween through same-direction and circumferential rotation of all the load-bearing rings, in the use state, the adjacent load-bearing rings are mutually pulled to the farthest end, so that the lifting locking structure is at the locking position and fixes relative positions of all the load-bearing rings; and in the stowed state, the lifting locking structure is switched to the unlocking position, all the load-bearing rings are lowered to a height of the lowermost load-bearing ring, and the stool panel and the base cooperate to cover the lifting assembly.

Several optional methods are also provided below, but the method are not intended to be additional limitations on the above overall scheme, and are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above overall scheme separately, and a plurality of optional methods can also be combined.

Preferably, the rear end of the stool panel is provided with at least one rotating position, and one end of the backrest is provided with at least one rotating member rotatably mounted in cooperation with the rotating position.

Preferably, the positioning structure is at least one stop strip and at least one clamping strip fixed at a rear end of an upper end surface of the stool panel, the stop strip is located in front of the clamping strip, a height of the stop strip is greater than a height of the clamping strip, an end of the backrest close to the rotating member is provided with an extension plate, and in the use state, a lower end of the extension plate is clamped between the stop strip and the clamping strip.

Preferably, the rotating position includes a plurality of adapter plates vertically fixed above the rear end of the stool panel, the rotating member is provided with a plurality of partition plates arranged at intervals from each other and a plurality of notches for the adapter plates to extend into, the adapter plates are arranged between adjacent partition plates, the rotating member is provided with a shaft rod in a penetrating manner, the shaft rod passes through all the partition plates and all the adapter plates at the same time, and in the use state, rear ends of the adapter plates abut against a rear inner wall of the rotating member and form the positioning structure together with the stop strip and the clamping strip.

Preferably, at least one positioning block is provided on an upper end surface of the stool panel, at least one positioning groove is provided on a front end surface of the backrest, and in the stowed state, the positioning block is matched with and clamped in the positioning groove.

Preferably, the upper end surface of the stool panel extends in a wave shape and has a wave crest and two wave troughs, the two wave troughs are respectively located on left and right sides of the wave crest, and a height of the wave crest is greater than heights of the wave troughs.

Preferably, the upper end surface of the stool panel is provided with at least one vacancy recessed downward, the backrest is provided with a through opening, and in the stowed state, the through opening corresponds to the at least one vacancy position and cooperates with the at least one vacancy position to form a holding position for a human hand to grip.

Preferably, the load-bearing rings include a lower connection load-bearing ring fixed on the base, an upper connection load-bearing ring fixed on the stool panel, and a plurality of intermediate load-bearing rings arranged between the upper connection load-bearing ring and the lower connection load-bearing ring, the lifting locking structure includes a plurality of coupling groove groups arranged at intervals along a circumferential direction of the intermediate load-bearing rings or the lower connection load-bearing ring, and a plurality of sliding blocks fixed on lower ends of the intermediate load-bearing rings or the upper connection load-bearing ring, each of the coupling groove groups includes a plurality of coupling grooves arranged at intervals from each other, each of the coupling grooves includes a positioning portion and a guiding portion, the positioning portion is provided on one side of an upper end of the guiding portion and forms a bending structure, the guiding portion extends vertically, the sliding block is slidably connected in the coupling groove, in the use state, the sliding block is placed in the positioning portion and forms a locking position, and in the stowed state, the sliding block is separated from the positioning portion and translates to a lowermost end of the guiding portion.

Preferably, upper end surfaces of the intermediate load-bearing rings and the lower connection load-bearing ring are provided with a plurality of concave positions spaced apart from each other and recessed downward along the circumferential direction of the upper end surfaces of the intermediate load-bearing rings and the lower connection load-bearing ring, a bottom end of each concave position is provided with a notch, lower ends of outer walls of the intermediate load-bearing rings and the upper connection load-bearing ring are provided with a plurality of load-bearing wedges, in the use state, in two adjacent load-bearing rings, the load-bearing wedge located on the upper load-bearing ring abuts against an upper side of the bottom end of the concave position located on the lower load-bearing ring, and in a process of switching from the use state to the stowed state, the load-bearing wedge located on the upper load-bearing ring enters from the upper side of the bottom end of the concave position of the lower load-bearing ring through the notch to a lower side of the notch.

More preferably, the upper connection load-bearing ring is fixed below the stool panel through clamping of a plurality of clamping blocks and clamping openings, the lower connection load-bearing ring is fixed above the base through clamping of a plurality of clamping blocks and clamping openings, at least one tension spring vertically placed is provided between the base and the stool panel, and a handle ring is provided on the stool panel or the base.

Compared with the prior art, the present invention has the following beneficial effects:

• • the backrest is rotatably mounted at the rear end of the stool panel; in a use state, the backrest needs to be turned upward to form a certain angle with the stool panel, thereby providing backrest support for a user. Without affecting folding and stowed functions, sitting experience of the user is better;
  • the lower connection load-bearing ring and each intermediate load-bearing ring are provided with the plurality of coupling groove groups, and each coupling groove group is provided with three coupling grooves for mounting sliding blocks in a sliding manner; in the use state, the sliding block is clamped on the positioning portion of the coupling groove; by designing the coupling groove groups, local load-bearing capacity can be greatly increased, and then overall load-bearing capacity of the stool body can be increased;
  • by providing the load-bearing wedges at the lower ends of the outer walls of the upper connection load-bearing ring and the intermediate load-bearing ring, in the use state, the load-bearing wedge located on the upper load-bearing ring abuts against the upper end of the lower load-bearing ring, thereby further increasing the load-bearing capacity of the stool body;
  • an upper end of the stool panel is designed as a wave-shaped structure, which is more ergonomic and more comfortable for a user to sit;
  • the plurality of tension springs are provided between the base and the stool panel, which can assist the user to fold and stow all the load-bearing rings more easily;
  • an outer contour of the base is designed to be square, in the use state, overall placement stability can be improved, and the base is not prone to toppling due to lateral stress.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to illustrate examples of the present invention or technical schemes in the related art more clearly, the drawings needed to be used in the examples or the related art will be briefly introduced below. Obviously, the drawings in the following description are merely some examples in the present invention. Those having ordinary skills in the art can obtain other drawings based on structures shown in these drawings without exerting creative work.

FIG. 1 is an overall structural diagram from a front viewing angle in a use state according to an embodiment of the present application.

FIG. 2 is an overall structural diagram from a rear viewing angle in the use state according to an embodiment of the present application.

FIG. 3 is an overall structural diagram from a front viewing angle in a stowed state according to an embodiment of the present application.

FIG. 4 is an overall structural diagram from a rear viewing angle in the stowed state according to an embodiment of the present application.

FIG. 5 is an overall structural diagram of a lower viewing angle in the stowed state according to an embodiment of the present application.

FIG. 6 is a schematic structural diagram after hiding a backrest and explosively separating an upper connection pad in the stowed state according to an embodiment of the present application.

FIG. 7 is a schematic structural diagram of a backrest according to an embodiment of the present application.

FIG. 8 is an exploded schematic diagram of a stool panel and the backrest in a use state according to an embodiment of the present application.

FIG. 9 is a schematic structural diagram after a splicing plate of the backrest is detached and separated according to an embodiment of the present application.

FIG. 10 is a schematic structural diagram of the stool panel from a lower viewing angle according to an embodiment of the present application.

FIG. 11 is a schematic structural diagram of a base from an upper viewing angle according to an embodiment of the present application.

FIG. 12 is a schematic structural diagram of the base after a lower connection pad is hidden from a lower viewing angle according to an embodiment of the present application.

FIG. 13 is a schematic structural diagram of a lower connection pad according to an embodiment of the present application.

FIG. 14 is an overall structural diagram after the base is hidden from a lower viewing angle in the stowed state according to an embodiment of the present application.

FIG. 15 is a schematic structural diagram of an upper connection load-bearing ring according to an embodiment of the present application.

FIG. 16 is a schematic structural diagram of a lower connection load-bearing ring according to an embodiment of the present application.

FIG. 17 is an assembled structural diagram of two adjacent intermediate load-bearing rings in the use state according to an embodiment of the present application.

FIG. 18 is an assembled structural diagram of the two adjacent intermediate load-bearing rings in the stowed state according to an embodiment of the present application.

FIG. 19 is a schematic structural diagram after the two adjacent intermediate load-bearing rings are explosively separated according to an embodiment of the present application.

FIG. 20 is an overall structural diagram after all the load-bearing rings are hidden according to an embodiment of the present application.

Reference Signs List

• • 1: base; 11: sleeve groove; 12: first clamping opening; 13: boss; 131: second clamping opening; 132: clearance opening; 133: first groove; 134: first concave member; 135: second concave member; 14: lower connection pad; 141: first clamping block; 142: first inverted fastener; 143: first matching ring opening; 144: second matching ring opening; 15: sealing plate; 16: fixing block; 2: lower connection load-bearing ring; 21: first coupling groove; 22: second clamping block; 23: first concave position; 231: first notch; 3: intermediate load-bearing ring; 31: second coupling groove; 311: positioning portion; 312: guiding portion; 313: inner coupling groove; 314: outer coupling groove; 32: first sliding block; 321: first inner connection block; 322: first outer connection block; 33: first load-bearing wedge; 34: second concave position; 341: second notch; 4: upper connection load-bearing ring; 41: flange; 42: third clamping block; 43: second sliding block; 431: second inner connection block; 432: second outer connection block; 44: second load-bearing wedge; 5: stool panel; 51: adapter plate; 52: positioning block; 53: connection ring; 531: third clamping opening; 532: abutment block; 54: second groove; 541: fourth clamping opening; 542: third concave member; 543: fourth concave member; 55: upper connection pad; 551: fourth clamping block; 552: third matching ring opening; 553: fourth matching ring opening; 56: stop strip; 57: clamping strip; 58: second inverted fastener; 6: backrest; 61: rotating member; 611: partition plate; 612: notch; 613: shaft rod; 62: positioning groove; 63: extension plate; 64: through opening; 65: splicing plate; 651: opening; 66: rib; 7: handle ring; 8: tension spring

The realization of a purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE INVENTION

The technical schemes in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the embodiment of the present invention, all other embodiments obtained by those having ordinary skills in the art without creative work fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain relative position relationship and movement of various components in a specific posture (as shown in the accompanying drawings), if the specific posture changes, the directional indications also change accordingly.

In addition, descriptions involving “first”, “second”, etc. in the present invention are merely used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating a quantity of indicated technical features. Therefore, the features defined as “first” or “second” may explicitly or implicitly include at least one of the features. In addition, the technical schemes between the various embodiments can be combined with each other, but must be based on the fact that ordinary technicians in the field can implement the technical schemes. When the combination of technical schemes is contradictory or cannot be implemented, it should be deemed that such combination of technical schemes does not exist and is not within a protection scope required by the present invention.

Detailed Embodiments Referring to FIGS. 1 to 20, the present invention is a foldable height-increasing stool with backrest, including:

• • a base 1;
  • a lifting assembly mounted above the base 1 and including a plurality of load-bearing rings nested and assembled sequentially from outside to inside, a lifting locking structure being provided between adjacent load-bearing rings;
  • a stool panel 5 mounted above the lifting assembly; and
  • a backrest 6 rotatably mounted at a rear end of the stool panel 5 and having a stowed state abutting against an upper portion of the stool panel 5, and a use state of pivoting upward away from the stool panel 5, in the use state, a positioning structure that cooperates to fix a position of the backrest 6 being provided between the backrest 6 and the stool panel 5.

The lifting locking structure has a locking position and an unlocking position, and is switched therebetween through same-direction and circumferential rotation of all the load-bearing rings, in the use state, the adjacent load-bearing rings are mutually pulled to the farthest end, so that the lifting locking structure is at the locking position and fixes relative positions of all the load-bearing rings. In the stowed state, the lifting locking structure is switched to the unlocking position, all the load-bearing rings are lowered to a height of the lowermost load-bearing ring, and the stool panel 5 and the base 1 cooperate to cover the lifting assembly.

For ease of understanding and following description, in the present embodiment, the base 1, the lifting assembly, and the stool panel 5 are collectively named as a stool body, which is equivalent to that the backrest 6 is rotatably mounted on a rear side of an upper end of the stool body.

As a preferred embodiment of the present embodiment, the rear end of the stool panel 5 is provided with at least one rotating position, and one end of the backrest 6 is provided with at least one rotating member 61 rotatably mounted in cooperation with the rotating position.

Then, referring to FIGS. 6 and 7, it can be seen that, in the present embodiment, the rotating position includes a plurality of adapter plates 51 vertically fixed above the rear end of the stool panel 5, the rotating member 61 is provided with a plurality of partition plates 611 arranged at intervals from each other and a plurality of notches 612 for the adapter plates 51 to extend into, the adapter plates 51 are arranged between adjacent partition plates 611, the rotating member 61 is provided with a shaft rod 613 in a penetrating manner, the shaft rod 613 passes through all the partition plates 611 and all the adapter plates 51 at the same time, and in the use state, rear ends of the adapter plates 51 abut against a rear inner wall of the rotating member 61 and form the positioning structure together with a stop strip 56 and a clamping strip 57.

Referring to FIGS. 1, 2 and 4, it can be seen that, in the present embodiment, there are two rotating positions, which are respectively provided on left and right sides of the rear end of the stool panel 5. An assembly manner of the rotating member 61 and the rotating position is described below:

• • when the rotating member 61 needs to be mounted on the corresponding rotating position, only all the adapter plates 51 need to be inserted into gaps between the adjacent partition plates 611 through the notches 612, the adapter plates 51 and the partition plates 611 are provided with through holes, and the shaft rod 613 passes through all the through holes in the adapter plates 51 and the partition plates 611, so that the rotating member 61 can be mounted on the rotating position. In addition, the notches 612 can enable the adapter plates 51 and the rotating member 61 to smoothly complete relative rotation.

Referring to FIGS. 2-4, 6 and 7, it can be seen that, in the present embodiment, the positioning structure is at least one stop strip 56 and at least one clamping strip 57 fixed at a rear end of an upper end surface of the stool panel 5, the stop strip 56 is located in front of the clamping strip 57, a height of the stop strip 56 is greater than a height of the clamping strip 57, an end of the backrest 6 close to the rotating member 61 is provided with an extension plate 63, and in the use state, a lower end of the extension plate 63 is clamped between the stop strip 56 and the clamping strip 57.

In the present embodiment, two stop strips 56 and two clamping strips 57 are provided, when the backrest 6 needs to be switched from the stowed state to the use state, the backrest 6 is turned upward by hand, and in the upward turning process of the backrest 6, the extension plate 63 passes through the clamping strips 57 first. Since the height of each clamping strip 57 is low, and the extension plate 63 is made of a plastic material, the extension plate 63 passes over the clamping strip 57 after slightly deforming and abuts against a rear end of each stop strip 56, and the stop strip 56 can prevent the backrest 6 from continuing to turn backward. The clamping strip 57 require the user to exert a little force to turn the backrest 6 upward again and switch to the stowed state.

In addition, in the use state, the adapter plate 51 abuts against the rear inner wall of the rotating member 61, and then cooperates with the stop strip 56 to fix the rotating position of the backrest 6. In this case, the backrest 6 has a large pressure bearing capacity and can be safely leaned on by the user.

Then, referring to FIG. 1, it can be seen that, in the present embodiment, left and right sides of an upper end surface of the stool panel 5 close to the rear position are respectively provided with a positioning block 52, left and right sides of a front end surface of the backrest 6 close to the lower position are respectively provided with a positioning groove 62, and in the stowed state, the positioning block 52 is matched with and clamped in the positioning groove 62.

Here, in the stowed state, the positioning block 52 and the positioning groove 62 enables the backrest 6 and the stool panel 5 to be fixed to each other, and the backrest 6 can be separated from the stool panel 5 only under a certain external force. In this way, in the stowed state, in a process of taking the foldable height-increasing stool in the present embodiment through a handle ring 7 (mentioned below), there is no need to worry that the backrest 6 suddenly flips open from the stool panel 5.

Next, referring to FIGS. 6 and 8, it can be seen that, in the present embodiment, the upper end surface of the stool panel 5 extends in a wave shape and has a wave crest and two wave troughs, the two wave troughs are respectively located on left and right sides of the wave crest, and a height of the wave crest is greater than heights of the wave troughs.

Here, the upper end surface of the stool panel 5 is designed as a wave-shaped structure having one wave crest and two wave troughs which is more ergonomic, thereby improving comfort of a seat cushion of the user.

Referring to FIG. 6, it can be seen that, in the present embodiment, the upper end surface of the stool panel 5 is provided with two vacancies recessed downward, the backrest 6 is provided with a through opening 64, and in the stowed state, the through opening 64 corresponds to the two vacancies in position and cooperates with each other to form a holding position for a human hand to grip.

A formation method of the vacancies on the upper end surface of the stool panel 5 will be described below.

In the present embodiment, the stool panel 5 is provided with a second groove 54, and an upper connection pad 55 is matched with and mounted in the second groove 54. An inner edge of the second groove 54 is provided with a plurality of fourth clamping openings 541 spaced apart from each other, and an outer edge of the upper connection pad 55 is provided with a plurality of fourth clamping blocks 551. The upper connection pad 55 can be assembled by clamping the fourth clamping blocks 551 and the fourth clamping openings 541. A third concave member 542 and a fourth concave member are provided in the second groove 54, a third matching ring opening 552 and a fourth matching ring opening 553 are provided on the upper connection pad 55, the third matching ring opening 552 and an upper end of the third concave member 542 are matched and abutted to form one vacancy, and the fourth matching ring opening 553 and an upper end of the fourth concave member 543 are matched and abutted to form another vacancy. This design can facilitate processing and assembly of the stool panel 5. In the stowed state, after a hand of the user passes through the through opening 64, the hand can enter the vacancy, and then can abut against the front end surface of the backrest 6, and at this time, force can be applied.

In addition, since the upper connection pad 55 is provided at the center of the upper end surface of the stool panel 5, the two vacancies does not affect normal sitting of the user, and the comfort can be improved to some extent.

Next, referring to FIGS. 8 and 9, it can be seen that, in the present embodiment, a splicing plate 65 is detachably mounted on a rear side of the backrest 6, the splicing plate 65 is provided with an opening 651 corresponding to the through opening 64, and a plurality of ribs 66 are provided inside the backrest 6. This design not only facilitates injection molding of the backrest 6 but also reduces cost of injection molding materials without affecting structural stability of the backrest 6.

Referring to FIGS. 14 to 19, it can be seen that, in the present embodiment, each of the load-bearing rings includes a lower connection load-bearing ring 2 fixed on the base 1, an upper connection load-bearing ring 4 fixed on the stool panel 5, and a plurality of intermediate load-bearing rings 3 arranged between the upper connection load-bearing ring 4 and the lower connection load-bearing ring 2, the lifting locking structure includes a plurality of coupling groove groups arranged at intervals along a circumferential direction of the intermediate load-bearing ring 3 or the lower connection load-bearing ring 2, and a plurality of sliding blocks fixed on a lower end of the intermediate load-bearing ring 3 or the upper connection load-bearing ring 4, each of the coupling groove groups includes a plurality of coupling grooves arranged at intervals from each other, each of the coupling grooves includes a positioning portion 311 and a guiding portion 312, the positioning portion 311 is provided on one side of an upper end of the guiding portion 312 and forms a bending structure, the guiding portion 312 extends vertically, the sliding block is slidably connected in the coupling groove, in the use state, the sliding block is placed in the positioning portion 311 and forms a locking position, and in the stowed state, the sliding block is separated from the positioning portion 311 and translates to a lowermost end of the guiding portion 312.

A working principle of the lifting assembly is as follows: in the use state, the sliding block is placed on the positioning portion 311, the positioning portion 311 is a sunken notch, and a lower end of the positioning portion 311 is provided with an inclined surface; after the sliding block is placed on the positioning portion 311, if the load-bearing rings are directly rotated, the sliding block cannot be separated from the positioning portion 311. When it is necessary to switch to the stowed state, the load-bearing rings need to be pulled up to a certain height, and the sliding block is separated from the positioning portion 311, and then the load-bearing rings are rotated to move the sliding block to an upper end of the guiding portion 312 (since the upper connection load-bearing ring 4 is fixed on the stool panel 5, all the load-bearing rings can translate upward by pulling up the stool panel 5, and all the load-bearing rings can be driven to rotate in sequence from top to bottom by continuously rotating the stool panel 5). After the sliding block moves to the upper end of the guiding portion 312, since the guiding portion 312 extends vertically, a sliding block of an upper load-bearing ring of two adjacent load-bearing rings can slide along the guiding portion 312 of a lower load-bearing ring by pressing down the load-bearing rings until sliding to a lower end of the guiding portion 312, and the upper load-bearing ring and the lower load-bearing ring are located at the same height.

Then, in order to increase structural stability of the lifting assembly, in the present embodiment, inner diameters of all the load-bearing rings are sequentially increased from top to bottom, that is, an inner diameter of the upper connection load-bearing ring 4 is the smallest, and an inner diameter of the lower connection load-bearing ring 2 is the largest. When upper load-bearing rings in all adjacent load-bearing rings is lowered to the same height as lower load-bearing rings in all adjacent load-bearing rings, referring to FIG. 14, it can be seen that, at this time, the upper connection load-bearing ring 4 and all the intermediate load-bearing rings 3 are lowered to a height of the lower connection load-bearing ring 2, that is, all the load-bearing rings are at the same height and are nested and connected with each other. At this time, referring to FIGS. 3 to 5, the stool panel 5 and the base 1 are clamped and fixed to each other (which will be mentioned later), so that the lifting assembly can be stowed between the stool panel 5 and the base 1, which occupies a small space.

For ease of understanding, referring to FIGS. 15 to 19, in the present embodiment, a sliding block located in each of the intermediate load-bearing rings 3 is a first sliding block 32, a sliding block located in the upper connection load-bearing ring 4 is a second sliding block 43, a coupling groove located in the lower connection load-bearing ring 2 is a first coupling groove 21, and a coupling groove located in the intermediate load-bearing ring 3 is a second coupling groove 31.

With respect to connection between the upper connection load-bearing ring 4 and the intermediate load-bearing ring 3, there are a plurality of second sliding blocks 43 fixed at a lower end of the upper connection load-bearing ring 4 at intervals along a circumferential direction of the upper connection load-bearing ring 4, each of the second sliding blocks 43 includes a second inner connection block 431 and a second outer connection block 432 which are integrally formed, the second coupling groove 31 includes an inner coupling groove 313 and an outer coupling groove 314 which are communicated with each other, the outer coupling groove 314 is located outside the inner coupling groove 313, the second inner connection block 431 is slidably connected in the inner coupling groove 313, and the second outer connection block 432 is slidably connected in the outer coupling groove 314.

With respect to connection of adjacent intermediate load-bearing rings 3, there are a plurality of first sliding blocks 32 fixed at lower ends of the intermediate load-bearing rings 3 at intervals along a circumferential direction of the upper intermediate load-bearing rings 3, each of the first sliding blocks 32 includes a first inner connection block 321 and a first outer connection block 322 which are integrally formed, the first inner connection block 321 is slidably connected in the inner coupling groove 313, and the first outer connection block 322 is slidably connected in the outer coupling groove 314.

With respect to connection between the intermediate load-bearing ring 3 and the lower connection load-bearing ring 2, the first coupling groove 21 and the second coupling groove 31 have the same structure, and the first sliding block 32 is matched with and slidably connected in the first coupling groove 21, which will not be described in detail here.

In connection structures of the above adjacent load-bearing rings, by providing the inner coupling groove 313 and the outer coupling groove 314, sliding mounting between the second sliding block 43 and the second coupling groove 31, sliding mounting of the first sliding block 32 and the second coupling groove 31, and sliding mounting of the first sliding block 32 and the first coupling groove 21 are both very stable.

It should be noted that, in a process of switching to the stowed state, with respect to rotation of all the load-bearing rings, when the second sliding block 43 of the upper connection load-bearing ring 4 translates to the upper end of the guiding portion 312 of the intermediate load-bearing ring 3, continuing to rotate the upper connection load-bearing ring 4 (implemented by rotating the stool panel 5) can drive the intermediate load-bearing ring 3 to rotate, and make the first sliding block 32 of the upper intermediate load-bearing ring 3 translate to the upper end of the guiding portion 312 of the lower intermediate load-bearing ring 3. Similarly, by continuously rotating the stool panel 5, all the sliding blocks can translate to the upper end of the guiding portion 312.

Then, in the present embodiment, upper end surfaces of the intermediate load-bearing rings 3 and the lower connection load-bearing ring 2 are provided with a plurality of concave positions spaced apart from each other along its own circumferential direction and recessed downward, a bottom end of each concave position is provided with a notch, lower ends of outer walls of the intermediate load-bearing rings 3 and the upper connection load-bearing ring 4 are provided with a plurality of load-bearing wedges, in the use state, in two adjacent load-bearing rings, the load-bearing wedge located on the upper load-bearing ring abuts against an upper side of the bottom end of the concave position located on the lower load-bearing ring, and in a process of switching from the use state to the stowed state, the load-bearing wedge located on the upper load-bearing ring enters from the upper side of the bottom end of the concave position of the lower load-bearing ring through the notch to a lower side of the notch.

For ease of understanding, referring to FIGS. 15 to 19, it can be seen that, in the present embodiment, a load-bearing wedge located in the intermediate load-bearing ring 3 is a first load-bearing wedge 33, a load-bearing wedge located in the upper connection load-bearing ring 4 is a second load-bearing wedge 44, a concave position located in the lower connection load-bearing ring 2 is a first concave position 23, a notch located in the first concave position 23 is a first notch 231, a concave position located in the intermediate load-bearing ring 3 is a second concave position 34, and a notch located in the second concave position 34 is a second notch 341. In the use state, the first load-bearing wedge 33 abuts above a bottom end of the first concave position 23, and the second load-bearing wedge 44 abuts above a bottom end of the second concave position 34, thereby effectively increasing bearing capacity of the lifting assembly. When it is necessary to switch to the stowed state, by rotating all the load-bearing rings, the first load-bearing wedge 33 can be moved to directly above the first notch 231, and the second load-bearing wedge 44 can be moved to directly above the second notch 341, then, the stool panel 5 is pressed down, and the first load-bearing wedge 33 enters below the first notch 231 through the first notch 231, and the second load-bearing wedge 44 enters below the second notch 341 through the second notch 341.

More specifically, the upper connection load-bearing ring 4 is fixed below the stool panel 5 through clamping of a plurality of clamping blocks and clamping openings, the lower connection load-bearing ring 2 is fixed above the base 1 through clamping of a plurality of clamping blocks and clamping openings, at least one tension spring 8 vertically placed is provided between the base 1 and the stool panel 5, and the handle ring 7 is provided on the stool panel 5 or the base 1.

With respect to clamping between the lower connection load-bearing ring 2 and the base 1, referring to FIGS. 11, 16 and 20, it can be seen that, in the present embodiment, the base 1 is provided with a sleeve groove 11 for the lower connection load-bearing ring 2 to be clamped into, a groove bottom edge of the sleeve groove 11 is provided with a plurality of first clamping openings 12 spaced apart from each other, a lower end edge of the lower connection load-bearing ring 2 is provided with a plurality of second clamping blocks 22 spaced apart from each other, and the lower connection load-bearing ring 2 can be fixed on the base 1 by clamping between the second clamping blocks 22 and the first clamping openings 12.

In addition, in the present embodiment, a plurality of sealing plates 15 are detachably mounted on the upper end surface of the base 1, and the sealing plates 15 are arranged to cooperate with each other to form the sleeve groove 11.

With respect to clamping between the stool panel 5 and the upper connection load-bearing ring 4, referring to FIGS. 10 and 15, it can be seen that, in the present embodiment, a lower end of the stool panel 5 is provided with a connection ring 53, the connection ring 53 is provided with a plurality of third clamping openings 531 spaced apart from each other along its circumferential direction, an outer wall of the connection ring 53 is further provided with a plurality of abutment blocks 532 spaced apart from each other, an upper end of the upper connection load-bearing ring 4 is provided with a plurality of flanges 41 spaced apart from each other, an inner side of each flange 41 is fixed with a third clamping block 42, the upper connection load-bearing ring 4 can be fixed on the stool panel 5 through clamping of the third clamping blocks 42 and the third clamping openings 531, and at this time, the upper end of the upper connection load-bearing ring 4 abuts against the abutment blocks 532.

In addition, referring to FIGS. 5, 12 and 13, it can be seen that, in the present embodiment, a boss 13 is provided at a groove bottom of the sleeve groove 11 of the base 1, a plurality of second clamping openings 131 spaced apart from each other are provided at an edge of the boss 13, a first groove 133 corresponding to the boss 13 is provided at a lower end of the base 1, a first concave member 134 and a second concave member 135 are provided at the bottom of the first groove 133, a first pad is mounted at a notch of the first groove 133, an edge of the first pad is provided with a plurality of first clamping blocks 141 corresponding to the second clamping openings 131 for clamping, and the first pad is provided with a first matching ring opening 143 and a second matching ring opening 144, the first matching ring opening 143 and a lower end of the first concave member 134 abut against each other to form one vacancy, and the second matching ring opening 144 and a lower end of the second concave member 135 abut against each other to form another vacancy.

In the present embodiment, an upper end of the first pad is provided with two first inverted fasteners 142, the bottom of the first groove 133 is provided with two clearance openings 132, and the first inverted fasteners 142 extend above the clearance openings 132 after passing through the clearance openings 132. Then, the lower end of the stool panel 5 is provided with two second inverted fasteners 58, and in the stowed state, the first inverted fasteners 142 and the second inverted fasteners 58 are clamped in an inverted manner (in a process of pressing down the stool panel 5, the first inverted fasteners 142 and the second inverted fasteners 58 can be slightly deformed to achieve mutual inverted clamping), so that the stool panel 5 and the base 1 can be connected to each other, thereby preventing the stool panel 5 from being separated from the base 1. When it is necessary to switch to the use state, since the stool panel 5 needs to be rotated, positions of the first inverted fasteners 142 and the second inverted fasteners 58 are misaligned at this time, and subsequently pulling the stool panel 5 apart will not be affected.

Referring to FIGS. 3 and 4, in the present embodiment, the rear end of the stool panel 5 is provided with the handle ring 7, and in the stowed state, the user can lift and fold the foldable height-increasing stool through the handle ring 7, which is convenient to take.

In addition, referring to FIG. 20, in the present embodiment, the bottom of the sleeve groove 11 of the base 1 and the bottom of the stool panel 5 are each provided with a plurality of fixing blocks 16 for cooperating with mounting of the tension springs 8, the tension springs 8 are vertically arranged, and the plurality of tension springs 8 cooperate with each other, so as to assist the user to more easily complete folding and stow of all the load-bearing rings.

It should be noted that in a traditional similar foldable stool, an outer contour of the base 1 is mainly a circular contour, and in an actual use process, in this structural design, when the stool body is subjected to side impact force, the stool is prone to toppling, and placement stability is poor. Therefore, in the present embodiment, the outer contour of the base 1 is designed to be square (in the stowed state, in order to facilitate connection between the base 1 and the stool panel 5, in the present embodiment, an outer contour of the stool panel 5 is also designed to be square), so that overall placement stability of the stool can be improved, and the stool is not prone to toppling due to the side impact force.

The above described foldable height-increasing stool with a backrest of the present invention is only a preferred embodiment of the present invention, and is not intended to limit a patent scope of the present invention. Under the inventive concept of the present invention, all equivalent structural changes made by using contents of description and the accompanying drawings of the present invention, or direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

The present invention discloses a foldable height-increasing stool with a backrest. The foldable height-increasing stool includes: a base; a lifting assembly mounted above the base and including a plurality of load-bearing rings nested and assembled sequentially from outside to inside, a lifting locking structure being provided between adjacent load-bearing rings; a stool panel mounted above the lifting assembly; and a backrest rotatably mounted at a rear end of the stool panel, the lifting locking structure has a locking position and an unlocking position, and is switched therebetween through same-direction and circumferential rotation of all the load-bearing rings. In the present invention, the backrest is rotatably mounted at the rear end of the stool panel; in a use state, the backrest needs to be turned upward to form a certain angle with the stool panel, thereby providing backrest support for a user. Without affecting folding and stowed functions, sitting experience of the user is better. In addition, by providing a coupling groove group, a sliding block and a load-bearing wedge on the lifting assembly, load-bearing capacity of the stool body can be effectively increased. An upper end of the stool panel is designed to be a wave-shaped structure, which can improve comfort of a seat cushion while providing a backrest function.