FOLDABLE SUPPORT FRAME AND FOLDABLE CHAIR

Description

TECHNICAL FIELD

The present disclosure relates to a foldable support frame and a foldable chair, and belongs to the technical field of outdoor leisure products.

BACKGROUND

It is well known that foldable support frames can achieve effects of folding and storage, and therefore are widely applied to outdoor leisure products such as outdoor folding chairs, outdoor folding tables, and outdoor folding beds currently.

For example, the Chinese patent CN215347878U discloses a foldable space chair. The foldable space chair includes a foldable support frame and a chair cover, where the foldable support frame includes a C-shaped body, a rear support block, and two front support blocks. Two arc-shaped rods are movably mounted at both ends inside the C-shaped body through rivets, and respective ends of the two arc-shaped rods away from the C-shaped body are movably hinged with the two front support blocks respectively.

The structural arrangement enables to fold the foldable chair for storage as needed. However, since the two arc-shaped rods movably connected to the C-shaped body have no fixed structure, when the foldable chair is unfolded for use, the arc-shaped rods of the foldable chair are inevitably folded inward, thereby resulting in poor stability and affecting safety of using the foldable chair. Moreover, to fold this structure, a user needs to exert a large force to push the C-shaped body to fold inward, thereby making it inconvenient and laborsome.

SUMMARY

In order to overcome the defects in the prior art, an objective of the present disclosure is to provide a foldable support frame and a foldable chair that are easily used in a labor-saving, stable and safe manner.

The objective of the present disclosure is achieved through the following technical solution:

A foldable support frame, where the foldable support frame includes a rear support seat, two front support seats, two side connecting rods, a first front connecting rod, a second front connecting rod, and an adapter seat; the two front support seats are symmetrically arranged in front of the rear support seat from left to right, and the two front support seats and the rear support seat are detachably connected to upper support rods and lower foot rods; one end of either of the two side connecting rods is rotatably connected to the rear support seat, the other ends of the two side connecting rods are fixedly connected to the two front support seats, one end of the first front connecting rod is rotatably connected to one of the front support seats, the other end of the first front connecting rod is rotatably connected to one end of the adapter seat, one end of the second front connecting rod is rotatably connected to the other front support seat, and the other end of the second front connecting rod is fixedly connected to the other end of the adapter seat; an elastic self-locking piece is arranged on the first front connecting rod, a locking hole is formed in the adapter seat, when the foldable support frame is unfolded, the elastic self-locking piece can be automatically inserted into the locking hole to lock the first front connecting rod and the adapter seat together, and in this case, the foldable support frame cannot be folded; and an unlocking key is slidably mounted in the locking hole, one end of the unlocking key is in abutting fit with an insertion end of the elastic self-locking piece, the other end of the unlocking key is exposed outside the adapter seat with a pressing part formed, and when the pressing part is pressed, the unlocking key pushes the insertion end of the elastic self-locking piece out of the locking hole to release the lock between the first front connecting rod and the adapter seat, such that the foldable support frame is in a foldable state.

Further, the adapter seat is provided with a first open slot that penetrates through in a left-right direction and opens forward, the first front connecting rod extends into one end of the first open slot and is rotatably connected to upper and lower slot walls of the first open slot through a first pin shaft, and the second front connecting rod extends into the other end of the first open slot and is fixedly connected to the upper and lower slot walls of the first open slot through a second pin shaft.

Further, distances from the two front support seats to the first pin shaft are equal, and a position of the first pin shaft is located more forward than a position of the second pin shaft.

Further, the end of the first front connecting rod that extends into the first open slot is fixedly connected to an adapter, and an end of the adapter away from the first front connecting rod, through the above first pin shaft, is rotatably connected to a mid-forward position of the upper and lower slot walls of the first open slot.

Further, the adapter seat includes an inner housing that forms the first open slot and an outer housing that wraps around an outer side of the inner housing and is fixedly integrated with the inner housing, the locking hole includes a first hole section formed on a lower slot wall of the first open slot and a second hole section that is formed on a lower wall of the outer housing and vertically communicated with the first hole section, the unlocking key is slidably mounted in the second hole section, a lower end of the unlocking key extends out of the second hole section and is exposed outside a lower end of the adapter seat to form the pressing part, a diameter of the first hole section is smaller than that of the second hole section, an upper stop step for preventing the unlocking key from upwardly disengaging from the second hole section is formed between upper ends of the first hole section and the second hole section, a lower stop step for preventing the unlocking key from downwardly disengaging from the second hole section is arranged at a lower end of the second hole section, and the insertion end of the elastic self-locking piece can penetrate through the first hole section and extend into the second hole section.

Further, the outer housing includes an upper outer housing section and a lower outer housing section that are made separately, the upper outer housing section wraps around an outer upper part of the inner housing, the lower outer housing section wraps around an outer lower part of the inner housing, and both the first pin shaft and the second pin shaft penetrate through the upper outer housing section, the lower outer housing section and the inner housing, such that the upper outer housing section, the lower outer housing section and the inner housing are fixed together.

Further, an upper connecting protrusion and a lower connecting protrusion are arranged on back sides of the ends of the upper outer housing section and the lower outer housing section that are away from the second pin shaft respectively, the upper connecting protrusion is provided with a blind hole opened downward, the lower connecting protrusion is provided with a through hole corresponding to the blind hole, and a screw penetrates through the through hole from bottom to top and is screwed into the blind hole, thereby fixing the upper connecting protrusion and the lower connecting protrusion together.

Further, an inclined guide opening that extends downward from front of the first hole section toward an opening part of the first open slot is formed in the lower slot wall of the first open slot, and the inclined guide opening, when the foldable support frame is unfolded, is capable of guiding the insertion end of the elastic self-locking piece into the first open slot and guiding it toward the first hole section.

Further, the elastic self-locking piece includes a ball-head self-locking pin and a spring, the ball-head self-locking pin and the spring are both mounted in the first front connecting rod, a rod wall of the first front connecting rod is provided with an exposure hole for the ball-head self-locking pin to be exposed, and the spring is configured for keeping the ball-head self-locking pin exposed.

A foldable chair includes a flexible chair surface and a chair frame, the chair frame is the above foldable support frame, a back face of the flexible chair surface is provided with four plug-in sleeves, and the flexible chair surface, through the four plug-in sleeves, is detachably sleeved on the upper support rods of the two front support seats, as well as the upper support rods of the rear support seat.

Compared with the prior art, the present disclosure has the beneficial effects as follows:

First of all, when the foldable support frame of the present disclosure is unfolded, the elastic self-locking piece can be automatically inserted into the locking hole to lock the first front connecting rod and the adapter seat together, and in this case, the foldable support frame cannot be folded, thereby preventing accidental folding of the foldable support frame or the foldable chair during use, and having the advantages such as strong stability and high safety.

Secondly, when the foldable support frame of the present disclosure is unfolded, the first front connecting rod and the second front connecting rod are on a same horizontal straight line with the adapter seat. Therefore, when releasing the lock between the first front connecting rod and the adapter seat by the elastic self-locking piece, only a small force is needed to push the adapter seat and drive the two front connecting rods to fold inward, thereby having advantages such as easy and labor-saving operation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional schematic diagram of a front view of a foldable support frame of the present disclosure.

FIG. 2 is a front view of a foldable support frame of the present disclosure.

FIG. 3 is a top view of a foldable support frame in a folded state of the present disclosure.

FIG. 4 is a three-dimensional schematic diagram of a main part of a foldable support frame in a folded state of the present disclosure.

FIG. 5 is a three-dimensional schematic diagram of a front view of a main part of a foldable support frame of the present disclosure.

FIG. 6 is a schematic diagram of a top view of a first front connecting rod, an adapter seat, and a second front connecting rod in a connection state of the present disclosure.

FIG. 7 is a sectional view of a part C-C in FIG. 6.

FIG. 8 is a partial enlarged view of a part D in FIG. 7.

FIG. 9 is a schematic diagram of a breakdown structure of a first front connecting rod, an adapter seat, and a second front connecting rod in a connection state of the present disclosure.

FIG. 10 is an exploded view of an adapter seat of the present disclosure from a front depression angle.

FIG. 11 is an exploded view of an adapter seat of the present disclosure from a rear elevation angle.

FIG. 12 is a three-dimensional schematic diagram of a front view of a foldable chair of the present disclosure.

FIG. 13 is a three-dimensional schematic diagram of a back face of a flexible chair surface of the present disclosure.

DETAILED DESCRIPTIONS OF THE EMBODIMENTS

The present disclosure will be further described in detail below with reference to the examples shown in the accompanying drawings.

As illustrated in FIGS. 1-11, a foldable support frame provided in this example includes: a rear support seat 21, two front support seats 22 and 23, two side connecting rods 24 and 25, a first front connecting rod 26, a second front connecting rod 27, and an adapter seat 28.

The two front support seats 22 and 23 are symmetrically arranged in front of the rear support seat 21 from left to right, upper support rods 221 and 231 are detachably connected to upper ends of the two front support seats 22 and 23 respectively in an inserted manner, lower foot rods 222 and 232 are detachably connected to lower ends of the two front support seats 22 and 23 respectively in an inserted manner, upper support rods 211 and 212 are detachably connected to both sides of an upper end of the rear support seat 21 respectively in an inserted manner, and lower foot rods 213 and 214 are detachably connected to both sides of a lower end of the rear support seat 21 respectively in an inserted manner.

One end of either of the two side connecting rods 24 and 25 is rotatably connected to the rear support seat 21, the other ends of the two side connecting rods 24 and 25 are fixedly connected to the two front support seats 22 and 23, one end of the first front connecting rod 26 is rotatably connected to the front support seat 22, the other end of the first front connecting rod 26 is rotatably connected to one end of the adapter seat 28, one end of the second front connecting rod 27 is rotatably connected to the other front support seat 23, and the other end of the second front connecting rod 27 is fixedly connected to the other end of the adapter seat 28.

An elastic self-locking piece 3 is arranged on the first front connecting rod 26, a locking hole 4 is formed in the adapter seat 28, when the foldable support frame 2 is unfolded, the elastic self-locking piece 3 can be automatically inserted into the locking hole 4 to lock the first front connecting rod 26 and the adapter seat 28 together, and in this case, the foldable support frame 2 cannot be folded, thereby ensuring stability of the foldable support frame 2 after unfolding and enhancing safety during use.

An unlocking key 5 is slidably mounted in the locking hole 4, one end of the unlocking key 5 is in abutting fit with an insertion end of the elastic self-locking piece 3, the other end of the unlocking key 5 is exposed outside the adapter seat 28 with a pressing part 51 formed, and when the pressing part 51 is pressed, the unlocking key 5 pushes the insertion end of the elastic self-locking piece 3 out of the locking hole 4 to release the lock between the first front connecting rod 26 and the adapter seat 28, such that the foldable support frame 2 is in a foldable state.

In this example, the adapter seat 28 is provided with a first open slot 281 that penetrates through in a left-right direction and opens forward, one end of the first front connecting rod 26 away from the front support seat 22 extends into one end of the first open slot 281 and is rotatably connected to upper and lower slot walls of the first open slot 281 through a first pin shaft 6, one end of the second front connecting rod 27 away from the front support seat 23 extends into the other end of the first open slot 281 and is fixedly connected to the upper and lower slot walls of the first open slot 281 through a second pin shaft 7, and to improve stability of fixed connection between the second front connecting rod 27 and the upper and lower slot walls of the first open slot 281, two second pin shafts 7 may be arranged at an interval in the left-right direction.

In this example, distances from the two front support seats 22 and 23 to the first pin shaft 6 are equal, and a position A of the first pin shaft 6 is located more forward than a position B of the second pin shaft 7, to ensure that the first front connecting rod 26 and the second front connecting rod 27 remain aligned when folded.

In this example, the end of the first front connecting rod 26 that extends into the first open slot 281 is fixedly connected to an adapter 8, and an end of the adapter 8 away from the first front connecting rod 26, through the above first pin shaft 6, is rotatably connected to a mid-forward position of the upper and lower slot walls of the first open slot 281.

In this example, the adapter 8 includes a plug-in part 81 and an adapter part 82 connected to one end of the plug-in part 81, the plug-in part 81 is inserted into the first front connecting rod 26 and fixedly connected by means of a pin, and one end of the adapter part 82 away from the plug-in part 81 is provided with a connecting hole 820 for the above first pin shaft 6 to penetrate through.

In this example, the adapter seat 28 includes an inner housing 282 that forms the first open slot 281 and an outer housing 283 that wraps around an outer side of the inner housing 282 and is fixedly integrated with the inner housing 282, the locking hole 4 includes a first hole section 41 formed on a lower slot wall 2812 of the first open slot 281 and a second hole section 42 that is formed on a lower wall 2832 of the outer housing 283 and vertically communicated with the first hole section 41, the unlocking key 5 is slidably mounted in the second hole section 42, a lower end of the unlocking key 5 extends out of the second hole section 42 and is exposed outside a lower end of the adapter seat 28 to form the pressing part 51, a diameter of the first hole section 41 is smaller than that of the second hole section 42, an upper stop step 43 for preventing the unlocking key 5 from upwardly disengaging from the second hole section 42 is formed between upper ends of the first hole section 41 and the second hole section 42, a lower stop step 44 for preventing the unlocking key 5 from downwardly disengaging from the second hole section 42 is arranged at a lower end of the second hole section 42, and the insertion end of the elastic self-locking piece 3 can penetrate through the first hole section 41 and extend into the second hole section 42. Therefore, when the pressing part 51 of the unlocking key 5 is pressed upward, and the unlocking key 5 can sequentially push the insertion end of the elastic self-locking piece 3 to disengage from the second hole section 42 and the first hole section 41 sequentially, so as to release the lock between the first front connecting rod 26 and the adapter seat 28.

In this example, for ease of mounting, the outer housing 283 includes an upper outer housing section 283a and a lower outer housing section 283b that are made separately, the upper outer housing section 283a wraps around an outer upper part of the inner housing 282, the lower outer housing section 283b wraps around an outer lower part of the inner housing 282, and both the first pin shaft 6 and the second pin shaft 7 penetrate through the upper outer housing section 283a, the lower outer housing section 283b and the inner housing 282, such that the upper outer housing section 283a, the lower outer housing section 283b and the inner housing 282 are fixed together.

Moreover, to ensure that respective ends of the upper outer housing section 283a and the lower outer housing section 283b that are away from the second pin shaft 7 are not separated, an upper connecting protrusion 284 and a lower connecting protrusion 285 are arranged on back sides of the ends of the upper outer housing section 283a and the lower outer housing section 283b that are away from the second pin shaft 7 respectively, the upper connecting protrusion 284 is provided with a blind hole 286 opened downward, the lower connecting protrusion 285 is provided with a through hole 287 corresponding to the blind hole 286, and a screw 9 penetrates through the through hole 287 from bottom to top and is screwed into the blind hole 286, thereby fixing the upper connecting protrusion 284 and the lower connecting protrusion 285 together.

In this example, an inclined guide opening 2813 that extends downward from front of the first hole section 41 toward an opening part of the first open slot 281 is formed in the lower slot wall 2812 of the first open slot 281, and the inclined guide opening 2813, when the foldable support frame 2 is unfolded, is capable of guiding the insertion end of the elastic self-locking piece 3 into the first open slot 281 and guiding it toward the first hole section 41.

In this example, the elastic self-locking piece 3 includes a ball-head self-locking pin 31 and a spring 32, the ball-head self-locking pin 31 and the spring 32 are both mounted in the first front connecting rod 26, a rod wall of the first front connecting rod 26 is provided with an exposure hole 261 for the ball-head self-locking pin 31 to be exposed, and the spring 32 is configured for keeping the ball-head self-locking pin 31 exposed, such that when the foldable support frame 2 is fully unfolded, the ball-head self-locking pin 31 will be automatically inserted into the locking hole 4 under the action of the spring 32.

In this example, second open slots 223 and 233 that are opened inward in an L shape are formed in the two front support seats 22 and 23 respectively, one end of the first front connecting rod 26 away from the adapter seat 28 extends into the second open slot 223 of the front support seat 22 and is rotatably connected to the front support seat 22 through a third pin shaft 10, one end of the second front connecting rod 27 away from the adapter seat 28 extends into the second open slot 233 of the other front support seat 23 and is rotatably connected to the other front support seat 23 through a fourth pin shaft 11, a front end surface of the rear support seat 21 is symmetrically provided with two inwardly recessed grooves 215 and 216 that are opened forward and have a certain width in the left-right direction, and respective ends of the two side connecting rods 24 and 25 away from the two front support seats 22 and 23 extend into the two inwardly recessed grooves 215 and 216 and are rotatably connected to them through fifth pin shafts 12 and 13.

As described above, when the foldable support frame 2 is in an unfolded state, a folding process is as follows: First, the pressing part 51 of the unlocking key 5 is pressed upward to move upward the unlocking key 5 and push the insertion end of the elastic self-locking piece 3 out of the locking hole 4, so as to release the lock between the first front connecting rod 26 and the adapter seat 28, then the adapter seat 28 is pushed backward to cause the first front connecting rod 26 and the second front connecting rod 27 to rotate backward for folding respectively relative to the two front support seats 22 and 23, in this process, the two side connecting rods 24 and 25 rotate toward each other respectively relative to the rear support seat 21 until the first front connecting rod 26 and the second front connecting rod 27 are completely folded together, and in this case, the two side connecting rods 24 and 25 reach a folded state, thereby completing the folding process.

As illustrated in FIGS. 12 and 13, in this example, there is further provided a foldable chair, and the foldable chair includes a flexible chair surface 1 and a chair frame, where the chair frame is the above foldable support frame 2, the flexible chair surface 1 is of a fabric structure, its back is provided with four plug-in sleeves 100, and the flexible chair surface 1, through the four plug-in sleeves 100, is detachably sleeved on the upper support rods 221 and 231 of the two front support seats 22 and 23, as well as the upper support rods 211 and 212 of the rear support seat 21.