CN111374479A

CN111374479A - Folding structure of chair

Info

Publication number: CN111374479A
Application number: CN202010346704.XA
Authority: CN
Inventors: 万鹏; 杨涛
Original assignee: WONDERLAND NURSERYGOODS CO LTD
Current assignee: WONDERLAND NURSERYGOODS CO LTD
Priority date: 2015-11-17
Filing date: 2016-11-15
Publication date: 2020-07-07
Anticipated expiration: 2036-11-15
Also published as: CN106974477A; CN106974477B; CN111374478A; CN111374479B; CN111374478B

Abstract

The invention discloses a seat folding structure which comprises a seat tube, a connecting tube, a bottom tube, a first connecting seat, a second connecting seat and a locking mechanism, wherein the seat tube is pivoted with the end part of the connecting tube; one end of the bottom tube is connected with the second connecting seat, and the seat tube is rotatably arranged on the second connecting seat; the first connecting seat is arranged in a sliding manner along the central axis direction of the bottom pipe, and the locking mechanism is arranged in the first connecting seat and locks the bottom pipe and the first connecting seat, so that the connecting pipe is adjusted to realize angle adjustment or folding of the seat. The angle of the folding structure of the chair can be adjusted, the folding structure can be folded, the structure is simple, the use is convenient, and the folding structure is safe and reliable.

Description

Folding structure of chair

The invention is a divisional application with the application number of 201611035691.4 and the application date of 2016, 11 and 15 and the name of a folding structure of a seat.

Technical Field

The present invention relates to a seat, and more particularly to a foldable seat structure with adjustable angle.

Background

The foldable child seat can be unfolded or folded at any time according to actual needs, so that the foldable child seat is quite convenient to use and carry, and the use of the foldable child seat is more extensive. The prior child seat generally comprises a seat body, a front support and a rear support, wherein the front support and the rear support the seat body, the front support and the rear support are opened when the child seat is used, the front support and the rear support are locked by using a locking assembly to support the seat body, and the front support and the rear support can be folded when the child seat is not used, so that the child seat is convenient to carry or store. However, the conventional child seats generally lack the function of adjusting the angle of the seat, and some seats with the function have complex structures and are inconvenient to use.

Disclosure of Invention

The invention aims to provide a folding structure of a seat, which has the advantages of adjustable angle, folding, simple structure and convenient use.

In order to achieve the above object, the seat folding structure provided by the present invention comprises a seat tube, a connecting tube, a bottom tube, a first connecting seat, a second connecting seat and a locking mechanism, wherein the seat tube is pivotally connected to an end of the connecting tube, and the connecting tube is rotatably disposed on the first connecting seat; one end of the bottom tube is connected with the second connecting seat, and the seat tube is rotatably arranged on the second connecting seat; the first connecting seat is arranged in a sliding manner along the central axis direction of the bottom pipe, and the locking mechanism is arranged in the first connecting seat and locks the bottom pipe and the first connecting seat, so that the connecting pipe is adjusted to realize angle adjustment or folding of the seat.

Because the invention is provided with the seat tube, the linkage tube and the bottom tube, the linkage tube is pivoted with the seat tube and is connected with the bottom tube through the first connecting seat, and then the bottom tube is pivoted with the seat tube through the second connecting seat, so that the seat tube, the linkage tube and the bottom tube form a triangular bracket structure, and the seat tube can swing by utilizing the movement of the first connecting seat relative to the bottom tube, thereby achieving the purpose of adjusting the angle or folding; and the first connecting seat and the bottom pipe are locked by using the locking mechanism, so that the adjustment state is kept stable, the use safety is ensured, the structure is simple, and the use is convenient.

Preferably, the first connecting seat is slidably sleeved on the bottom pipe.

Specifically, locking mechanical system includes first operating parts and locking piece, be equipped with the slide opening on the first connecting seat, first operating parts is followed the center pin direction of bottom tube set up with sliding in the slide opening, first operating parts has the drive inclined plane, the locking piece has the cooperation inclined plane, be equipped with the block tooth in the locking piece, be equipped with a plurality of first block openings along the center pin direction on the bottom tube, first operating parts passes through drive inclined plane and cooperation inclined plane drive the block tooth interlock of locking piece or break away from first block opening. Since the locking member is engaged with the bottom tube through the engaging teeth and the first engaging holes, and the moving direction of the engaging teeth is perpendicular to the moving direction of the first operating member, the driving slope is provided to enable the first operating member to effectively drive the locking member to move along a central axis perpendicular to the bottom tube.

More specifically, the locking mechanism further includes a first elastic element, and the first elastic element is disposed between the first connecting seat and the locking member and provides an elastic force for automatically engaging the engaging teeth with the first engaging holes.

Specifically, the seat folding structure further comprises a second safety lock, wherein the second safety lock is arranged on the first connecting seat and locks the first connecting seat and the bottom tube.

More specifically, the second safety lock includes a second operating part, the second operating part is slidably disposed on the first connecting seat along a direction perpendicular to the bottom tube, the second operating part is provided with a protruding column, a guide inclined plane is disposed at an end of the protruding column, the bottom tube is provided with a second clamping hole, and the protruding column is inserted into the second clamping hole. The second safety lock is arranged to prevent the locking mechanism from being unlocked accidentally, so that the whole seat folding structure is folded accidentally, the potential safety hazard of replacement is overcome, and the use safety is improved.

Specifically, the second safety lock comprises a second elastic element, and the second elastic element is arranged between the inner wall of the first connecting seat and the second operating piece and provides elastic force for enabling the convex column to be automatically inserted into the second clamping hole. The second elastic element can be automatically clamped in the second clamping hole, so that the first connecting seat can be prevented from excessively sliding and accidentally disengaging from the bottom pipe.

Preferably, the first connecting seat is provided with a limiting elongated hole, the linking tube extends outwards to form a limiting column, and the limiting column is inserted into the limiting elongated hole. The limiting elongated hole is matched with the limiting column, so that the range of the adjusting angle can be limited, the maximum and minimum angles can be quickly positioned, and the adjustment is quicker and more convenient.

Preferably, the seat folding structure further comprises a base, wherein a detachable upright post is mounted on the base, and the upper end of the upright post is fixedly connected with the bottom tube.

Drawings

Fig. 1 is a schematic structural view of a first embodiment of a folding structure of a seat of the invention.

Fig. 2 is a side view of a folding structure of the seat of the invention according to a first embodiment.

Fig. 3 is a schematic view of a locking mechanism of a first embodiment of a folding structure of a seat according to the invention.

Fig. 4 is an exploded view of the locking mechanism of the first embodiment of the folding structure of the seat of the present invention.

Fig. 5 is a cross-sectional view of a locking mechanism of a first embodiment of a folding structure of a seat of the invention.

Fig. 6 is a cross-sectional view of an operating member of a first embodiment of the folding structure of the seat of the invention.

Fig. 7 is a structural diagram of a first connecting seat of a folding structure of a seat according to a first embodiment of the invention.

Fig. 8 is a schematic view of a folding structure of a seat according to an embodiment of the present invention when fully folded.

Fig. 9 is a schematic structural view of a second folding structure of the seat of the invention.

Fig. 10 is a side view of a second embodiment of the folding structure of the seat of the present invention.

Fig. 11 is a schematic view of a locking mechanism of a second embodiment of the folding structure of the seat of the invention.

Fig. 12 is an exploded view of the locking mechanism of the second embodiment of the folding structure of the seat of the present invention.

Fig. 13 is a cross-sectional view of a locking mechanism of a second embodiment of a seat folding structure according to the invention.

Fig. 14 is a sectional view of the seat folding structure according to the second embodiment of the invention when unlocked.

Fig. 15 is a cross-sectional view of a second embodiment of the folding structure of the seat of the present invention when locked.

Fig. 16 is a sectional view of a second safety lock of the second embodiment of the folding structure of the seat of the invention.

Fig. 17 is a schematic structural view of a third embodiment of a folding structure of a seat of the invention.

Fig. 18 is a schematic cross-sectional view of a third embodiment of a folding structure of a seat of the invention.

Fig. 19 is a structural diagram of a positioning assembly of a third embodiment of the folding structure of the seat of the invention.

Fig. 20 is a diagram illustrating a third embodiment of the folding structure of the seat according to the present invention in a fully folded state.

Detailed Description

In order to explain technical contents, structural features, and effects achieved by the present invention in detail, the following detailed description is given with reference to the embodiments and the accompanying drawings.

Fig. 1 to 8 show a first embodiment of a folding structure of a seat of the present invention, which is as follows:

as shown in fig. 1 and 2, the seat folding structure 100 of the present invention includes a seat tube 1, a linking tube 2, a bottom tube 3, a first connecting seat 4, a second connecting seat 5, a sliding tube 6, a locking mechanism 7 and a base 8, wherein the seat tube 1 is formed by two U-shaped tubes that are butted, and the linking tube 2 is also U-shaped; the middle part of the seat tube 1 is pivoted with the two end parts of the connecting tube 2; the middle part of the connecting pipe 2 is rotatably sleeved in the first connecting seat 4; one end of the bottom tube 3 is fixedly connected with the second connecting seat 5, and the seat tube 1 is rotatably arranged on the second connecting seat 5; the sliding tube 6 is slidably disposed on the bottom tube 3 and fixedly connected to the first connecting seat 4, and the sliding tube 6 enables the first connecting seat 4 to slide along the central axis direction of the bottom tube 3, so as to adjust the position of the first connecting seat 4; the locking mechanism 7 is installed in the sliding tube 6 and locks the sliding tube 6 and the bottom tube 3, so as to adjust the position of the first connecting seat 4 to lock the angle of the connecting tube 2 relative to the seat tube 1, thereby realizing the angle adjustment or folding of the seat. The base 8 is provided with a detachable upright column 81, and the upper end of the upright column 81 is fixedly connected with the bottom tube 3.

Referring to fig. 3-6, the locking mechanism 7 includes a driving member 71, a positioning seat 72, an engaging pin 73, an elastic member 74, an operating member 75 and a connecting pin 76, the bottom tube 3 is provided with a plurality of engaging holes 31 along the central axis direction, and the sliding tube 6 is provided with a through hole 61 for the engaging pin 73 to pass through. The positioning seat 72 is fixed to the sliding tube 6, the driving member 71 is movably disposed in the sliding tube 6, the moving direction is along the central axis direction of the bottom tube 3, the engaging pin 73 is slidably disposed in a sliding hole 72a of the positioning seat 72, and the sliding hole 72a is opened along a direction perpendicular to the central axis direction of the bottom tube 3; a driving inclined groove 71a is formed in a side surface of one end of the driving member 71, and the connecting pin 76 is inserted into the driving inclined groove 71a, the engaging pin 73 and the positioning seat 72. The elastic element 74 is disposed between the positioning seat 72 and the driving member 71, so that the driving member 71 returns to an original state. The driving member 71 moves to drive the engaging pin 73 to move up and down in the sliding hole 72a to simultaneously withdraw from or insert into the engaging hole 31 of the bottom tube 3 and the through hole 61 of the sliding tube 6. Since the bottom tube 3 and the sliding tube 6 are sleeved with each other and are respectively provided with the engaging hole 31 and the through hole 61, when the engaging holes of the bottom tube 3 and the sliding tube 6 are overlapped, the engaging pin 73 can be driven by the driving member 71, so that the engaging pin 73 can be simultaneously inserted into the engaging hole 31 and the through hole 61, and the bottom tube 3 and the sliding tube 6 can be locked. Since the driver 71 is disposed along the central axis of the bottom pipe 3 and the engaging hole 31 is perpendicular to the central axis of the bottom pipe 3, the driving oblique groove 71a is disposed to convert the force of the driver 71 along the central axis of the bottom pipe 3 into the driving force along the perpendicular direction, thereby effectively driving the engaging pin 73. The bottom surface of the first connecting seat 4 is provided with a mounting hole 41, the operating element 75 is mounted in the mounting hole 41 in a vertically sliding manner, the operating element 75 has a driving inclined surface 75a, the driving element 71 has a matching inclined surface 71b, and the driving element 71 is moved by pressing the operating element 75 through the driving inclined surface 75a and the matching inclined surface 71 b. Since the operating member 75 is press-operated and mounted on the bottom surface of the first connecting base 4 in a direction perpendicular to the central axis of the base pipe 3, the driving inclined surface 75a is provided to allow the operating member 75 to effectively drive the driving member 71 to move along the central axis of the base pipe 3.

Referring to fig. 7, the first connecting seat 4 is provided with a limiting elongated hole 42, the connecting tube 2 protrudes outward from the limiting column 21, and the limiting column 21 is inserted into the limiting elongated hole 42. The matching of the limiting elongated hole 42 and the limiting column 21 can limit the range of the adjustment angle on one hand, and can realize the quick positioning of the maximum and minimum angles on the other hand, so that the adjustment is quicker and more convenient.

In summary, with reference to fig. 2 to 8, the following describes the operation principle of the first embodiment in detail, as follows:

when the seat is unfolded at the maximum angle, the sliding tube 6 completely extends into the bottom tube 3, the seat tube 1 is maximum relative to the bottom tube 3, the limiting column 21 is located at one end of the limiting elongated hole 42, and the clamping pin 73 is inserted into the clamping hole 31 and the through hole 61, which are overlapped with each other, of the bottom tube 3 and the sliding tube 6. When the angle needs to be adjusted or folded, the operating element 75 is pressed, the operating element 75 drives the driving element 71 to move through the driving inclined surface 75a and the matching inclined surface 71b, the driving element 71 drives the engaging pin 73 to ascend along the sliding hole 72a through the driving inclined groove 71a and the connecting pin 76, at this time, the engaging pin 73 exits from the engaging hole 31 and the through hole 61, and the bottom tube 3 and the sliding tube 6 are unlocked; the sliding tube 6 is pulled again, so that the sliding tube 6 extends out along the bottom tube 3, and in the process that the sliding tube 6 extends out of the bottom tube 3, the lower end of the connecting tube 2 swings along with the first connecting seat 4, the limiting column 21 slides to the other end of the limiting elongated hole 42, and the seat tube 1 swings around a central shaft sleeved with the second connecting seat 5, so that the angle of the seat tube 1 relative to the bottom tube 3 is reduced, and the purpose of adjusting the angle is achieved; when the bottom tube 3 is adjusted to a proper state and the engaging hole 31 of the bottom tube 3 is overlapped with the through hole 61 of the sliding tube 6, the operating member 75 is released, the driving member 71 returns to the original state under the action of the automatic return force of the elastic member 74, and the engaging pin 73 is inserted into the engaging hole 31 and the through hole 61 overlapped with each other, and is locked in the current state again. When the sliding tube 6 extends to the longest, the angle of the seat tube 1 relative to the bottom tube 3 is the smallest, and the seat tube is in a folding state.

Because the invention is provided with the seat tube 1, the linkage tube 2 and the bottom tube 3, the linkage tube 2 is pivoted with the seat tube 1 and is connected with the bottom tube 3 through the first connecting seat 4, and then the bottom tube 3 is pivoted with the seat tube 1 through the second connecting seat 5, so that the seat tube 1, the linkage tube 2 and the bottom tube 3 form a triangular bracket structure, and the seat tube 1 can swing by utilizing the movement of the first connecting seat 4 relative to the bottom tube 3, thereby achieving the purposes of adjusting the angle or folding; and the first connecting seat 4 and the bottom tube 3 are locked by the locking mechanism 7, so that the adjustment state is kept stable, the use safety is ensured, the structure is simple, and the use is convenient.

Fig. 9 to 16 show a second embodiment of the folding structure of the seat of the present invention, which is as follows:

referring to fig. 9 to 11, the seat folding structure 200 of the present embodiment includes a seat tube 1, a linking tube 2, a bottom tube 3 and a second connecting seat 5 according to the first embodiment, except that the bottom tube 3 extends along a central axis, the first connecting seat 9 is slidably sleeved on the bottom tube 3, and the structure of the locking mechanism 10 is different from that of the first embodiment.

Referring to fig. 12 to 15, specifically, the locking mechanism 10 includes a first operating member 101, a locking member 102 and a first elastic element 103, a sliding hole 91 is disposed on the first connecting seat 9, the first operating member 101 is slidably disposed in the sliding hole 91 along a central axis direction of the bottom tube 3, and the locking member 102 is disposed in the first connecting seat 9; the first operating member 101 has a driving inclined surface 101a, the locking member 102 has a matching inclined surface 102a, the locking member 102 has a plurality of engaging teeth 102b on the inner side thereof, the bottom tube 3 has a plurality of first engaging holes 31 along the central axis direction, and the first operating member 101 drives the engaging teeth 102b of the locking member 102 to engage with or disengage from the first engaging holes 31 through the driving inclined surface 101a and the matching inclined surface 102 a. Since the locking member 102 is engaged with the bottom tube 3 through the engaging tooth 102b and the first engaging hole 31, and the moving direction of the engaging tooth 102b is perpendicular to the moving direction of the first operating member 101, the driving slope 101a is provided to allow the first operating member 101 to effectively drive the locking member 102 to move along a central axis perpendicular to the bottom tube 3. The first elastic element 103 is disposed between the first connecting seat 9 and the locking member 102, and provides an elastic force for automatically engaging the engaging teeth 102b with the first engaging hole 31.

As shown in fig. 16, the seat folding structure 200 further includes a second safety lock 201, and the second safety lock 201 is disposed on the first connecting seat 9 and locks the first connecting seat 9 and the bottom tube 3. The second safety lock 201 comprises a second operating part 2011 and a second elastic element 2012, the second operating part 2011 is perpendicular to the direction of the bottom tube 3 and is slidably arranged on the first connecting seat 9, the second operating part 2011 is provided with a convex column 2011a, the end of the convex column 2011a is provided with a guide inclined plane 2011b, the bottom tube 3 is provided with a second clamping hole 32, and when the seat is at a minimum angle, the convex column 2011a is inserted into the second clamping hole 32. The second elastic element 2012 is disposed between the inner wall of the first connecting base 9 and the second operating member 2011, and provides an elastic force for automatically inserting the protruding column 2011a into the second engaging hole 32. The second elastic element 2012 can be automatically engaged in the second engaging hole 32. When the seat needs to be folded, the second safety lock 201 and the first operating member 101 must be operated, so as to prevent the locking mechanism 10 from being unlocked accidentally, thereby avoiding the accidental folding of the whole seat folding structure 200, overcoming potential safety hazards, and improving the safety of use. When the seat angle needs to be increased, only the first operating element 101 needs to be operated, because the guiding inclined plane 2011b is utilized, the end of the convex column 2011a is automatically separated from the second engaging hole 32.

With reference to fig. 14 and fig. 15, the following describes the operation principle of the second embodiment in detail as follows:

when the locking mechanism 10 and the second safety lock are in the locking state 201, and at this time, the seat is at the minimum angle, and when the seat is folded, the second operating element 2011 is pushed to make the boss 2011a exit from the second engaging hole 32, and at the same time, the first operating element 101 is operated to make the first operating element 101 slide in the sliding hole 91, at this time, the first operating element 101 drives the locking element 102 to move through the driving inclined surface 101a and the matching inclined surface 102a, the engaging tooth 102b of the locking element 102 is disengaged from the first engaging hole 31, at this time, the first connecting seat 9 is unlocked from the bottom tube 3, at this time, the first connecting seat 9 is pushed to slide on the bottom tube 3, so that the position of the first connecting seat 9 on the bottom tube 3 can be adjusted, thereby driving the connecting tube 2 to swing, when the first connecting seat 9 slides to the tail end of the bottom tube 3, the seat tube 1 and the bottom tube 3 are completely closed, and the folding of the seat is realized.

When locking mechanical system 10 and second safety lock 201 are in the locking state and need to increase the seat angle, only need operate first operating parts 101, make first operating parts 101 slide in sliding hole 91, at this moment, first connecting seat 9 with bottom tube 3 unblock, at this moment, promote first connecting seat 9 makes it slide on bottom tube 3 first connecting seat 9 slides, because the effect of direction inclined plane 2011b makes the tip of projection 2011a breaks away from second block hole 32 automatically, thereby makes second safety lock 201 automatic unlocking, readjust first connecting seat 9 is in position on bottom tube 3, thereby drive connecting tube 2 swings, seat pipe 1 keeps away from bottom tube 3 realizes increasing the seat angle. When the locking member 102 is adjusted to a proper state and the engaging tooth 102b of the locking member 102 is opposite to the first engaging hole 31, the first operating member 101 is released, and then the engaging tooth 102b of the locking member 102 is engaged with the first engaging hole 31 again under the action of the automatic restoring force of the first elastic element 103 and is locked in the current state; at the same time, the limiting column 21 slides to one end of the limiting elongated hole 42, and the angle of the seat tube 1 relative to the bottom tube 3 is maximum.

As shown in fig. 17-20, the drawings show a third embodiment of the folding structure of the seat of the present invention.

The seat folding structure 300 of the present embodiment is obtained by adding a positioning component 310 for fixing the second connecting seat on the basis of the first embodiment, specifically, the bottom tube 3 is pivotally connected to the pivot portion 51 of the second connecting seat 5, the positioning component 310 includes a locking block 311, a reset element 312 and a connecting member 313, the locking block 311 is slidably disposed in the bottom tube 3, the pivot portion 51 of the second connecting seat 5 is provided with a locking portion 511, and when the seat folding structure 300 is unfolded, the locking block 311 is inserted into the locking portion 511 to fix the second connecting seat 5. The reset element 312 is disposed in the bottom tube 3 and provides an elastic force for inserting the locking block 311 into the locking portion 511, and the reset element 312 enables the locking block 311 to be automatically inserted into the locking portion 511, so as to ensure that the second connecting seat 5 is effectively fixed. Two ends of the connecting member 313 are respectively connected to one end of the sliding tube 6 close to the second connecting seat 5 and the locking block 311, so that the end of the sliding tube 6 drives the locking block 311 to slide; of course, since the sliding tube 6 is fixed to the first connection seat 4, the connection member 313 may be connected to the first connection seat 4, and the operation effect is the same. The connecting member 313 is a flexible connecting member, and in this embodiment, the connecting member 313 is a steel wire. In addition, the length of the connecting member 313 is also required to be set properly, and the length should be set so that when the angle of the seat tube 1 relative to the bottom tube 3 is minimum (i.e. the seat tube 1 and the connecting tube 2 are completely flat), the sliding tube 6 just pulls the connecting member 313 so that the locking block 311 just disengages from the locking part 511. Therefore, the locking state of the second connecting seat 5 cannot be influenced when the angle of the seat tube 1 is adjusted, and the second connecting seat 5 can be interlocked and unlocked when the seat tube 1 is folded. By pivotally connecting the second connecting seat 5 to the bottom tube 3 and locking or unlocking the second connecting seat by the locking block 311, the seat folding structure 300 can be folded more flatly and occupy a smaller space. In addition, by providing the connection member 313, when the first connection seat 4 is operated to completely rotate the seat tube 1 to be flat, the locking block 311 can be pulled at the same time, so that the locking block 311 overcomes the elastic force of the reset element 312 to leave the locking portion 511, thereby unlocking the second connection seat 5, and further rotating and folding the second connection seat 5 downward, so that the seat folding structure 300 of the present invention is simpler to operate and more convenient to use.

In this embodiment, the positioning assembly 310 may be added on the basis of the second embodiment, only the connecting member 313 is connected to the first connecting seat 4, and the first connecting seat 4 slides to pull the connecting member 313 and further drive the locking block 311 to disengage from the locking portion 511, which is not described again. The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the present invention, which is therefore intended to cover all equivalent changes and modifications within the scope of the present invention.

Claims

1. A seat folding structure is characterized in that: the connecting device comprises a seat pipe, a connecting pipe, a bottom pipe, a first connecting seat, a second connecting seat and a locking mechanism, wherein the seat pipe is pivoted with the end part of the connecting pipe, and the connecting pipe is rotationally arranged on the first connecting seat; one end of the bottom tube is connected with the second connecting seat, and the seat tube is rotatably arranged on the second connecting seat; the first connecting seat is sleeved on the bottom pipe in a sliding manner along the central axis direction of the bottom pipe, and the locking mechanism is arranged in the first connecting seat and locks the bottom pipe and the first connecting seat, so that the connecting pipe is adjusted to realize angle adjustment or folding of the seat; locking mechanical system includes first operating parts and locking piece, be equipped with the slip hole on the first connecting seat, first operating parts is followed the center pin direction of bottom tube set up with sliding in the slip hole, first operating parts has the drive inclined plane, the locking piece has the cooperation inclined plane, be equipped with the block tooth in the locking piece, be equipped with a plurality of first block holes along the center pin direction on the bottom tube, first operating parts passes through drive inclined plane and cooperation inclined plane drive the block tooth interlock of locking piece or break away from first block hole.

2. The seat folding structure of claim 1, wherein: the locking mechanism further comprises a first elastic element, the first elastic element is arranged between the first connecting seat and the locking piece and provides elastic force for enabling the clamping teeth to be automatically meshed with the first clamping holes.

3. The seat folding structure of claim 1, wherein: the seat folding structure further comprises a second safety lock, wherein the second safety lock is arranged on the first connecting seat and locks the first connecting seat and the bottom pipe.

4. The seat folding structure of claim 3, wherein: the second safety lock comprises a second operating part, the second operating part is arranged on the first connecting seat in a sliding mode along the direction perpendicular to the bottom pipe, a protruding column is arranged on the second operating part, a guide inclined plane is arranged at the end portion of the protruding column, a second clamping hole is formed in the bottom pipe, and the protruding column is inserted into the second clamping hole.

5. The seat folding structure of claim 4, wherein: the second safety lock further comprises a second elastic element, the second elastic element is arranged between the inner wall of the first connecting seat and the second operating piece and provides elastic force for enabling the convex column to be automatically inserted into the second clamping hole.

6. The seat folding structure of any one of claims 1 to 5, wherein: the first connecting seat is provided with a limiting elongated hole, the linkage pipe extends outwards to form a limiting column, and the limiting column is inserted into the limiting elongated hole.

7. The seat folding structure of claim 1, wherein: the seat folding structure further comprises a base, wherein a detachable stand column is mounted on the base, and the upper end of the stand column is fixedly connected with the bottom pipe.