Translation protective door

Abstract

According to the technical scheme, when the sliding protective door is installed, a positioning mechanism and a locking mechanism can be installed and fixed at preset positions respectively, then a door fence body is installed, the lower portion of the pivot connection side of the door fence body is movably connected with the lower portion of the positioning mechanism, and therefore the door fence body can be installed conveniently. The connecting piece which can be installed on the upper portion of the pivoting connecting side of the door fence body in a pivoted mode is fixedly installed on the upper portion of the positioning mechanism, so that the installed door fence body can swing relative to the positioning mechanism to achieve door opening or door closing actions, and after the door is closed, the door fence body can be locked through the locking mechanism fixed to the other position. According to the utility model, the installation process is optimized, the installation by a single person is very easy and convenient, the problem of reinstallation is avoided in the installation process, and the installation efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic door barriers, in particular to a translational protective door. Background Art

[0002] Families with infants and young children often install a sliding door fence in indoor corridors, stairways and other locations to prevent the infants and young children from walking out of the room and causing accidents such as getting lost or getting injured. The sliding door fence is mainly composed of two movably connected door bodies, and the two sides of the sliding door fence are respectively a pivot connection side and a locking side, wherein a hinge seat or other pivotal structure is provided on the pivot connection side, and the sliding door fence is lengthened or shortened by translating one of the door bodies to make it overlap or stagger toward the two door bodies. During installation, the length of the door fence can be adjusted according to the width of the corridor, and then the hinge seat or other pivotal structure on the pivot connection side of the sliding door fence is fixed to the wall, so that the sliding door fence can be swung relative to the hinge seat or other pivotal structure to disconnect or connect the corridor, and when the sliding door fence is swung to the position where the corridor is disconnected, it can be connected and fixed to the locking side of the sliding door fence by a door fence lock fixed to the other wall, thereby locking the sliding door fence.

[0003] Since the hinge seat or other pivoting structure is directly set on the sliding door rail and cannot be disassembled, two people are required to cooperate during installation, one of whom holds the sliding door rail steady while the other uses tools to fix the hinge seat or other pivoting structure to the wall. Of course, it can also be installed by one person, but it is more troublesome when installed by one person, and it is necessary to use tools to install and fix the sliding door rail while keeping the sliding door rail in the correct position. During the process, it is easy to make installation errors due to the failure to hold the sliding door rail steady, resulting in the door body being skewed, the position being too high or too low, etc., which requires reinstallation, and the installation efficiency is poor. For this reason, the applicant has made improvements based on the existing technology and proposed a sliding protective door that can be easily and conveniently installed by one person. Utility Model Content

[0004] The main purpose of the utility model is to provide a translational protective door, aiming to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model proposes a translational sliding protective door, including a gate bar body and a locking mechanism located on the locking side of the gate bar body, and also including a positioning mechanism located on the pivotal connection side of the gate bar body, the lower part of the pivotal connection side and the lower part of the positioning mechanism are detachably connected, and the upper part of the pivotal connection side is pivotally provided with a connecting piece for detachable fixed installation with the upper part of the positioning mechanism.

[0006] When installing the technical solution of the utility model, the positioning mechanism and the locking mechanism can be installed and fixed at predetermined positions respectively first, and then the gate body can be installed, and the lower part of the pivotal connection side of the gate body can be movably connected with the lower part of the positioning mechanism, and the connecting piece pivotally installed on the upper part of the pivotal connection side of the gate body can be fixedly installed with the upper part of the positioning mechanism, so that the gate body after installation can be swung relative to the positioning mechanism to realize the door opening or closing action, and after closing the door, the gate body can be locked by a locking mechanism fixed at another position. Compared with the traditional method, the utility model optimizes the installation process, and it is also very easy and convenient for one person to install. There is no need to reinstall during the installation process, which effectively improves the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a three-dimensional diagram of the utility model;

[0008] Figure 2 It is a three-dimensional diagram of the positioning mechanism, the door sill body and the locking mechanism;

[0009] Figure 3 It is a cross-sectional view of the utility model;

[0010] Figure 4 A schematic diagram of the first angle of the plug post, the first top spring, the limit seat and the connecting member;

[0011] Figure 5 A second angle schematic diagram of the plug post, the first top spring, the limit seat and the connecting member;

[0012] Figure 6 is a cross-sectional view of the sleeve and the slot when they are matched;

[0013] Figure 7 is an exploded view of the locking mechanism;

[0014] Figure 8 A hierarchical diagram for positioning mechanisms;

[0015] Fig. 9 It is a schematic diagram of the positioning mechanism, the locking mechanism and the door fence body after folding. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0018] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the 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 solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0019] The utility model provides a translational protective door.

[0020] In the embodiment of the utility model, Figures 1 to 9 As shown, the sliding protective door includes a gate body 1 and a locking mechanism 2 located on the locking side of the gate body 1, and also includes a positioning mechanism 3 located on the pivotal connection side of the gate body 1, the lower part of the pivotal connection side and the lower part of the positioning mechanism 3 are detachably connected, and the upper part of the pivotal connection side is pivotally provided with a connecting piece 4 for detachable fixed installation with the upper part of the positioning mechanism 3.

[0021] When installing the technical solution of the utility model, the positioning mechanism and the locking mechanism can be installed and fixed at predetermined positions respectively first, and then the gate body can be installed, and the lower part of the pivotal connection side of the gate body can be movably connected with the lower part of the positioning mechanism, and the connecting piece pivotally installed on the upper part of the pivotal connection side of the gate body can be fixedly installed with the upper part of the positioning mechanism, so that the gate body after installation can be swung relative to the positioning mechanism to realize the door opening or closing action, and after closing the door, the gate body can be locked by a locking mechanism fixed at another position. Compared with the traditional method, the utility model optimizes the installation process, and it is also very easy and convenient for one person to install. There is no need to reinstall during the installation process, which effectively improves the installation efficiency.

[0022] Specifically, the positioning mechanism 3 includes a first support rod 31, a first lower seat 32 provided at the lower end of the first support rod 31, and a first slide seat 33 movably sleeved on the first support rod 31. The connecting member 4 is provided with a connection hole 41 with an open bottom for the upper end of the first support rod 31 to be inserted from bottom to top. The first slide seat 33 is detachably fixedly connected to the wall through a first quick-release structure to fix the first support rod 31. The first lower seat 32 is provided with a plug hole 321 with an open top. The lower part of the pivot connection side is provided with a pin 100 for movably plugging with the plug hole 321. When the positioning mechanism 3 is installed on a wall with a skirting, since the wall surface and the skirting are no longer in the same plane, it is not suitable for installation. The first lower seat 32 and the first support rod 31 can be connected to the wall by the first slide to avoid the skirting, thereby avoiding the problem of the positioning mechanism 3 being difficult to install.

[0023] It should be noted that the first quick-release structure can refer to the prior art, and its specific structural principle will not be described in detail here.

[0024] Specifically, the lower end of the first support rod 31 is plugged into and fitted with the first lower seat 32 and then locked with a bolt.

[0025] Specifically, the upper end of the first support rod 31 is sleeved with an L-shaped connection seat 34, and is also provided with a first screw 35. The rod of the first screw 35 passes through the connection seat 34 and the first support rod 31 in sequence and is screwed and fixed to the wall, so as to achieve a fixed connection between the upper end of the first support rod 31 and the wall. The upper part of the connection seat 34 is inserted into the connection hole 41. Specifically, the outer wall of the connection seat 34 is provided with a plurality of stripes 341 for elastically contacting the inner wall of the connection hole 41, so as to achieve an interference fit between the connection seat 34 and the connection hole 41.

[0026] Specifically, the first support rod 31 is a hollow tubular member, and a V-shaped elastic member 36 is provided at a position corresponding to the connection seat 34 inside the first support rod 31, and a block 361 is provided at one end of the elastic member 36, which can pass through the first support rod 31 and is exposed to the outside. The connection seat 34 and the connection member 4 are respectively provided with a first through hole 342 and a second through hole 42 for the block 361 to pass through, and after the upper part of the connection seat 34 is inserted into the connection hole 41, the block 361 passes through the first through hole 342 and the second through hole 42 in sequence to lock the connection member 4, the connection seat 34 and the first support rod 31. When it is necessary to release the lock, the block 361 can be pressed from the outside to make the block 361 withdraw from the second through hole 42 to release the lock between the connection member 4 and the connection seat 34, and when the block 361 is forced to withdraw from the first through hole 342, the lock between the connection seat 34 and the first support rod 31 can be released.

[0027] Specifically, a sleeve 43 with a top opening and a bottom opening is formed on one side of the connecting member 4 close to the pivotal connection side, and a slot 200 is formed on the upper part of the pivotal connection side for the upper end of the sleeve 43 to be movably inserted from bottom to top, and a column 201 is formed in the slot 200 and can be inserted into the sleeve 43, and the end of the column 201 is connected to a limiting seat 202, and a step 431 for abutting against the limiting seat 202 is formed on the inner wall of the sleeve 43 corresponding to the position above the limiting seat 202, and the gate body 1 can make vertical reciprocating motion relative to the connecting member 4 so that the limiting seat 202 abuts against the step 431 or moves away from the step 431.

[0028] Specifically, the limiting seat 202 is locked with the end of the plug post 201 by means of screws.

[0029] Specifically, the outer wall of the plug 201 is formed with a limit strip 203 extending along the length direction of the plug 201, the limit seat 202 is fixedly sleeved at the end of the plug 201, and the inner wall of the limit seat 202 is provided with a strip groove 204 for plugging with the limit strip 203 to prevent the limit seat 202 from pivoting relative to the socket.

[0030] Specifically, a V-shaped first latching position 432 and a second latching position 433 are annularly spaced apart at the upper end of the sleeve 43, the depth of the second latching position 433 is less than the depth of the first latching position 432, and a latching tooth 205 suitable for the first latching position 432 is formed on the inner wall of the slot 200. The latching tooth 205 can move between the position aligned with the first latching position 432 and the position aligned with the second latching position 433 as the gate bar body 1 swings, and can be engaged in or withdrawn from the first latching position 432 or partially engaged in or withdrawn from the second latching position 433 as the gate bar body 1 moves back and forth vertically. A first top spring 206 is also provided, and the first top spring 206 is sleeved on the plug column 201, and the two ends of the first top spring 206 are elastically resisted against the step 431 and the limit seat 202 respectively, and the first top spring 206 can apply an elastic force to the gate bar body 1 to make a downward movement. When the latch tooth 205 is located at the first latch position 432, the gate body 1 is in the door closing position. In the process of opening the door, it is necessary to first release the lock of the locking mechanism 2, lift the gate body 1 and then swing the gate body 1, for example, swing the gate body 1 90°, so that the latch tooth 205 can move to align with the second latch position 433, release the gate body 1 to make it fall, so that the latch tooth 205 is partially engaged with the second latch position 433 to achieve limiting, so that the gate body 1 can remain in the door opening state for a long time. When closing the door, since the depth of the second latching position 433 is relatively shallow, the gate body 1 can be swung directly, and the latch tooth 205 cooperates with the V-shaped structure of the second latching position 433 to guide the gate body 1 to move upward while swinging, so that the latch tooth 205 disengages from the second latching position 433, and then the elastic force applied by the first top spring 206 cooperates with the V-shaped structure of the latch tooth 205 and the first latching position 432, so that the latch tooth 205 is quickly engaged with the first latching position 432, so that the operator can let the gate body 1 swing by itself to close the door when the gate body 1 is slightly swung.

[0031] Specifically, there are two first latching positions 432 , which are spaced and aligned with each other. The second latching position 433 is disposed at a position between the two first latching positions 432 at the upper end of the sleeve 43 . Similarly, there are two latching teeth 205 .

[0032] Specifically, the first lower seat 32 is movably connected with a first locking member 322, and the first locking member 322 can move between a position where it is partially in close contact with the ground and a position where it is separated. After the first screw 35 fixes the upper end of the first support rod 31, the first lower seat 32 can also be fixed to the ground by the first locking member 322 being in close contact with the ground.

[0033] Specifically, the locking mechanism 2 includes a second support rod 21, a second lower seat 22 disposed at the lower end of the second support rod 21, a second slide seat 23 movably sleeved with the second support rod 21, and a locking seat 24 disposed at the upper end of the second support rod 21. The second slide seat 23 is detachably fixedly connected to the wall through a second quick-release structure to fix the second support rod 21. The upper part of the locking side is movably provided with a first telescopic member 11 having a driving part. The locking seat 24 is provided with a first clamping hole 241 corresponding to the position of the first telescopic member 11. The first telescopic member 11 can move between a position of partially extending into the first clamping hole 241 and a position of withdrawing. A second top spring 12 is further provided. The second top spring 12 is used to apply an elastic force to the first telescopic member 11 to move in a direction of partially extending into the first clamping hole 241. When the first telescopic member 11 partially extends into the first clamping hole 241, the gate body 1 and the locking seat 24 can be locked. When unlocking, the driving part is manually pushed to force the first telescopic member 11 to partially withdraw from the first clamping hole 241.

[0034] It should be noted that the second quick-release structure can be referred to in the prior art, and its specific structural principle will not be described in detail here.

[0035] Specifically, the lower end of the second support rod 21 is plugged into the second lower seat 22 and then locked by bolts.

[0036] Specifically, the second support rod 21 is a tubular structure.

[0037] Specifically, according to the technical feature that the gate sill body 1 can move within a certain range in the vertical direction, a second telescopic member 13 is provided at a position corresponding to the lower part of the first telescopic member 11 at the upper part of the locking side, a second clamping hole 242 is provided at a position corresponding to the second telescopic member 13 on the locking seat 24, the second clamping hole 242 has a front opening and a top opening, the second telescopic member 13 can move between a position where it partially extends into the second clamping hole 242 and a position away from the second clamping hole 242, and a third top spring 14 is provided, the third top spring 14 is used to apply an elastic force to the second telescopic member 13 to move in a direction where it partially extends into the second clamping hole 242, and an inclined surface 243 is provided on a side of the locking seat 24 close to the second telescopic member 13. When releasing the lock of the gate sill body 1, it is necessary to manually force the first telescopic member 11 to partially withdraw from the first clamping hole 241, and then lift the entire gate sill body 1 upwards to make the second telescopic member 13 partially disengage from the second clamping hole 242 through the top opening of the second clamping hole 242, so as to achieve the unlocking action of the gate sill body 1. When locking the gate body 1, the gate body 1 can contact the second telescopic member 13 through the inclined surface 243 during the swinging process and force the second telescopic member 13 to move away from the second clamping hole 242 as the gate body 1 continues to swing, until the second telescopic member 13 is aligned with the front opening of the second clamping hole 242. The elastic force applied to the second telescopic member 13 by the third top spring 14 causes the second telescopic member 13 to partially extend into the second clamping hole 242, thereby achieving the second locking to prevent the gate body 1 from being easily unlocked by infants and young children.

[0038] It can be understood that the inclined surface 243 can also contact the first telescopic member 11 and force the first telescopic member 11 to move in a direction away from the first engaging hole 241 .

[0039] Specifically, the second telescopic member 13 and the third top spring 14 are provided at the lower portion of the locking side, and the second lower seat 22 is provided with the second clamping hole 242 and the inclined surface 243 .

[0040] Specifically, the upper end of the second support rod 21 is plugged into and matched with the locking seat 24 and then locked by the second screw 25. The second screw 25 can be further screwed to the wall to achieve a fixed connection between the upper end of the second support rod 21 and the wall. The second lower seat 22 is movably screwed with a second locking member 221, and the second locking member 221 can move between a position where it is partially in close contact with the ground and a position where it is separated. After the upper end of the second support rod 21 is fixed, the second lower seat 22 can also be fixed to the ground by the second locking member 221 being in close contact with the ground.

[0041] Specifically, the first locking member 322 and the second locking member 221 have the same structure and may be bolts, the ends of which are pressed against the ground, or a pressure block is fixedly connected to the ends of the bolts, and the pressure block can be pressed against or separated from the ground as the bolts pivot.

[0042] Specifically, the gate body 1 includes a frame and a software body arranged on the frame. The frame includes two frames movably connected to each other. One of the two frames can translate between overlapping and offset positions with the other. The frame is formed by an upper cross bar, a lower cross bar and two vertical bars. A folding joint 5 is arranged in the middle of the vertical bar, so that the frame can be folded or unfolded through the folding joint 5.

[0043] It should be noted that the folding joint 5 can refer to the prior art, and its specific structural principle will not be described in detail here.

[0044] It should be noted that how to realize the mutual active connection between the two frames can refer to the existing technology, and its specific structural principle will not be repeated here.

[0045] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A translational protective door, comprising a door sill body (1) and a locking mechanism (2) located on the locking side of the door sill body (1), characterized in that: It also includes a positioning mechanism (3) located on the pivotal connection side of the door fence body (1), the lower part of the pivotal connection side is detachably connected to the lower part of the positioning mechanism (3), and the upper part of the pivotal connection side is pivotally provided with a connecting piece (4) for detachably fixing and mounting with the upper part of the positioning mechanism (3).

2. The translational protective door according to claim 1, characterized in that: The positioning mechanism (3) comprises a first support rod (31), a first lower seat (32) arranged at the lower end of the first support rod (31), and a first slide seat (33) movably sleeved on the first support rod (31); the connecting member (4) is provided with a connection hole (41) with an open bottom for the upper end of the first support rod (31) to be inserted from bottom to top; the first slide seat (33) is detachably fixedly connected to the wall through a first quick-release structure to fix the first support rod (31); the first lower seat (32) is provided with a plug hole (321) with an open top; and a pin (100) for movably plugging into the plug hole (321) is provided at the lower part of the pivot connection side.

3. The translational protective door according to claim 2, characterized in that: The upper end of the first support rod (31) is sleeved with an L-shaped connecting seat (34) and a first screw (35). The rod of the first screw (35) passes through the connecting seat (34) and the first support rod (31) in sequence and is screwed and fixed to the wall, thereby achieving a fixed connection between the upper end of the first support rod (31) and the wall. The upper part of the connecting seat (34) is inserted into the connecting hole (41).

4. The translational protective door according to claim 3, characterized in that: The first support rod (31) is a hollow tubular member. A V-shaped elastic member (36) is provided at a position inside the first support rod (31) corresponding to the connecting seat (34). A clamping block (361) which can pass through the first support rod (31) and is exposed to the outside is provided at one end of the elastic member (36). The connecting seat (34) and the connecting member (4) are respectively provided with a first through hole (342) and a second through hole (42) for the clamping block (361) to pass through at positions corresponding to the clamping block (361). After the upper part of the connecting seat (34) is inserted into the connecting hole (41), the clamping block (361) passes through the first through hole (342) and the second through hole (42) in sequence to lock the connecting member (4), the connecting seat (34) and the first support rod (31).

5. The translational protective door according to claim 1, characterized in that: A sleeve (43) having a top opening and a bottom opening is formed on one side of the connecting member (4) close to the pivotal connection side, a slot (200) is formed on the upper part of the pivotal connection side for the upper end of the sleeve (43) to be movably inserted from bottom to top, a plug post (201) is formed in the slot (200) and can be inserted into the sleeve (43), the end of the plug post (201) is connected to the limit seat (202), and a step (431) for abutting against the limit seat (202) is formed on the inner wall of the sleeve (43) at a position corresponding to the upper side of the limit seat (202), and the gate body (1) can make a vertical reciprocating motion relative to the connecting member (4) so ​​that the limit seat (202) abuts against the step (431) or moves away from the step (431).

6. The translational protective door according to claim 5, characterized in that: The outer wall of the plug post (201) is formed with a limiting strip (203) extending along the length direction of the plug post (201); the limiting seat (202) is fixedly sleeved on the end of the plug post (201); and the inner wall of the limiting seat (202) is provided with a strip groove (204) for plugging with the limiting strip (203).

7. The translational protective door according to claim 5, characterized in that: The upper end of the sleeve (43) is provided with a V-shaped first clamping position (432) and a second clamping position (433) at intervals in an annular manner. The depth of the second clamping position (433) is less than the depth of the first clamping position (432). The inner wall of the slot (200) is formed with a clamping tooth (205) adapted to the first clamping position (432). The clamping tooth (205) can move between a position aligned with the first clamping position (432) and a position aligned with the second clamping position (433) as the door sill body (1) swings. The first top spring (206) is provided with a first top spring (206), which is sleeved on the plug column (201), and the two ends of the first top spring (206) are elastically opposed to the step (431) and the limit seat (202), respectively, so that the first top spring (206) can exert an elastic force on the gate body (1) to make it move downward.

8. The translational protective door according to claim 2, characterized in that: The first lower seat (32) is movably and rotationally connected with a first locking member (322), and the first locking member (322) can move between a position where it is partially in close contact with the ground and a position where it is separated.

9. The sliding protective door according to claim 1, characterized in that: The locking mechanism (2) comprises a second support rod (21), a second lower seat (22) arranged at the lower end of the second support rod (21), a second sliding seat (23) movably sleeved on the second support rod (21), and a locking seat (24) arranged at the upper end of the second support rod (21); the second sliding seat (23) is detachably fixedly connected to the wall through a second quick-release structure to fix the second support rod (21); a first telescopic member (11) having a driving portion is movably arranged on the upper part of the locking side; a first clamping hole (241) is arranged at a position corresponding to the first telescopic member (11); the first telescopic member (11) can move between a position where it partially extends into the first clamping hole (241) and a position where it withdraws; a second top spring (12) is further arranged; the second top spring (12) is used to apply an elastic force to the first telescopic member (11) to move in a direction where it partially extends into the first clamping hole (241).

10. The translational protective door according to claim 9, characterized in that: A second telescopic member (13) is provided at a position corresponding to the lower portion of the first telescopic member (11) on the upper portion of the locking side; a second clamping hole (242) is provided at a position corresponding to the second telescopic member (13) on the locking seat (24); the second clamping hole (242) has a front opening and a top opening; the second telescopic member (13) can move between a position where it partially extends into the second clamping hole (242) and a position away from the second telescopic member (13); a third top spring (14) is provided; the third top spring (14) is used to apply an elastic force to the second telescopic member (13) to move in a direction where it partially extends into the second clamping hole (242); and an inclined surface (243) is provided on a side of the locking seat (24) close to the second telescopic member (13).

11. The translational protective door according to claim 10, characterized in that: The lower part of the locking side is provided with the second telescopic member (13) and the third top spring (14), and the second lower seat (22) is provided with the second clamping hole (242) and the inclined surface (243).

12. The translational protective door according to claim 9, characterized in that: The upper end of the second support rod (21) is plugged into and matched with the locking seat (24) and locked by a second screw (25). The second screw (25) can be further screwed to the wall to achieve a fixed connection between the upper end of the second support rod (21) and the wall. The second lower seat (22) is movably screwed with a second locking member (221). The second locking member (221) can move between a position in which it is partially in close contact with the ground and a position in which it is separated.

13. The translational protective door according to any one of claims 1 to 12, characterized in that: The gate body (1) comprises a frame and a soft body arranged on the frame, the frame comprises two frames movably connected to each other, one of the two frames can translate between a position overlapping with and a position offset from the other, the frame is formed by connecting an upper cross bar, a lower cross bar and two vertical bars, a folding joint (5) is arranged in the middle of the vertical bar, so that the frame can be folded or unfolded through the folding joint (5).

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