CN113184038A - Seat folding mechanism - Google Patents

Abstract

The invention discloses a seat folding mechanism, which comprises a backrest, a seat board, armrests, a socket and the like, wherein the lower end of the backrest, the rear end of the seat board and the upper end of the socket are coaxially and rotatably connected through a large joint, the lower end of the armrests is rotatably connected to the front end of the seat board through a small joint, a backrest lock is arranged in the backrest, a seat board lock is arranged in the large joint, and an armrest lock is arranged on the seat board. Therefore, the folding process of the seat is simpler, more convenient and more labor-saving through the armrest lock and the seat board lock which have ingenious structural design and reliable action matching.

Description

Seat folding mechanism

Technical Field

The invention relates to a folding mechanism, in particular to a seat folding mechanism.

Background

At present, seats used on a baby carriage are designed with folding mechanisms, the seat folding mechanisms mainly comprise a backrest, a seat board, armrests, a socket and the like, the lower end of the backrest, the rear end of the seat board and the upper end of the socket are coaxially and rotatably connected to form a large joint, and the lower ends of the armrests are rotatably connected to the front end of the seat board through small joints; meanwhile, a backrest lock used for unlocking the backrest to rotate relative to the seat board is arranged in the backrest, a seat board lock used for unlocking the seat board to rotate relative to the socket is arranged in the large joint, and an armrest lock used for unlocking the armrest to rotate relative to the seat board is arranged on the seat board. Therefore, the folding mechanism of the seat can better reduce the storage volume of the seat and is convenient for carrying when going out. However, the seat lock and the armrest lock in the conventional seat folding mechanism can not be folded in a linked manner, i.e., the seat and the armrest can only be folded by single operation, which results in a troublesome and laborious folding process of the seat. In addition, the armrest lock and the seat plate lock for folding are complex in structural design, and are usually locked or unlocked in a gear engaging or disengaging mode, and in actual operation, a user needs to accurately master an unlocking gear of a gear, so that the reliability of the action of matching and unlocking the gear is poor, and inconvenience is brought to the folding operation of the user.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a seat folding mechanism which can integrally link and fold the armrest and the seat board in the process of rotating the backrest relative to the socket, so that the integrally linked and folded armrest lock and seat board lock have the advantages of ingenious structural design, reliable action matching, simple, convenient and labor-saving folding process.

The technical problem of the invention is realized by the following technical scheme:

a chair folding mechanism comprises a backrest, a seat board, armrests and a socket, wherein the lower end of the backrest, the rear end of the seat board and the upper end of the socket are coaxially and rotatably connected through a large joint, and the lower ends of the armrests are rotatably connected to the front end of the seat board through small joints; the backrest is internally provided with a backrest lock, the large joint is internally provided with a seat plate lock, the seat plate is provided with a handrail lock, the backrest lock is unlocked, the backrest rotates around the large joint to the socket, the handrail lock is unlocked to drive the handrail to rotate around the small joint and be folded on the seat plate, and the seat plate lock is unlocked to drive the folded handrail to rotate together with the seat plate around the large joint and be folded on the socket.

The large joint comprises a rotating ring arranged at the lower end of the backrest and a rotating disc arranged at the rear end of the seat plate; the rotary disc, the rotary ring and the upper end of the socket are sequentially assembled and connected, and the rotary disc and the rotary ring rotate coaxially.

The small joint comprises a rotating shaft arranged at the lower end of the handrail and a rotating groove arranged at the front end of the seat board, and the rotating shaft is assembled in the rotating groove and is connected with the rotating groove in a coaxial rotating mode.

The outer circumferential surface of the rotating shaft is provided with a locking groove, and the inner circumferential surface of the rotating groove is provided with a through hole; the armrest lock is assembled in the lock groove through the through hole to lock the relative rotation of the rotating shaft and the rotating groove; the armrest lock is separated from the lock groove to unlock the relative rotation of the rotating shaft and the rotating groove.

The armrest lock comprises an unlocking sheet arranged on the seat plate, a sliding block arranged at the rear end of the unlocking sheet, an unlocking spring for elastically pushing the sliding block to move backwards, a reset spring with two ends respectively and elastically pushing the position between the sliding block and the unlocking sheet, and an unlocking hole arranged on the outer circumferential surface of the rotating ring; the rear end of the sliding block is elastically pushed and contacted on the outer circumferential surface of the rotating ring, and the front end of the unlocking sheet passes through the through hole to be assembled in the locking groove so as to lock the relative rotation of the rotating shaft and the rotating groove; the rear end of the sliding block is pushed by elasticity to move backwards to enter the unlocking hole, the sliding block drives the unlocking sheet to move backwards synchronously, and then the front end of the unlocking sheet is driven to be separated from the assembly of the lock groove to unlock the relative rotation of the rotating shaft and the rotating groove.

The unlocking piece is provided with a guide groove extending along a front-back straight line, the seat plate is provided with a guide rib penetrating into the guide groove, the front end of the unlocking spring is elastically pushed on the guide rib, and the rear end of the unlocking spring is elastically pushed on the sliding block.

The outer circumferential surface of the rotary disc is provided with a stop notch, and the rear end of the sliding block penetrates through the unlocking hole to be assembled in the stop notch.

The seat plate lock comprises a gear block which is arranged on an inner end face of the upper end of the socket and is pushed by elasticity to move inwards, a lock column and a slope arranged on one side of the lock column are arranged on the inner end face of the gear block, a trapezoidal block protruding towards the outer end face is correspondingly arranged in the rotating ring, and a lock hole is arranged on the inner end face of the rotating disc; the gear block is pushed by elasticity to move inwards and drives the lock column to be assembled in the lock hole so as to lock the relative rotation of the turntable and the upper end of the socket; the rotating ring rotates relative to the rotating disc, the inclined surface of the trapezoidal block pushes the slope to drive the gear block to move outwards and drive the lock column to be separated from the lock hole so as to unlock the relative rotation of the rotating disc and the upper end of the socket.

The backrest lock comprises a handle arranged at the top of the backrest, an elastic pin arranged at the bottom of the backrest and driven by the handle to move, and a plurality of gear slots arranged on the outer circumferential surface of the turntable, wherein the handle drives the elastic pin to be selectively assembled in the gear slots to adjust the angle of the backrest; the handle drives the elastic pins to be separated from the plurality of gear grooves, and the backrest rotates around the large joint to be folded towards the socket.

The outer circumference of the rotary disc is provided with a stop groove, the backrest drives the folded handrail and the seat board to rotate around the large joint and fold on the socket, and the elastic pin is assembled in the stop groove to be locked.

Compared with the prior art, the seat plate lock and the armrest lock are designed into an integrated linkage folding operation structure, namely, the armrest and the seat plate are folded in an integrated linkage mode by sequentially unlocking the armrest lock and the seat plate lock, specifically, the backrest lock on the backrest is unlocked, the backrest rotates to the socket around the large joint, the armrest lock is unlocked to drive the armrest to rotate around the small joint and be folded on the seat plate, and the seat plate lock is unlocked to drive the folded armrest to rotate together with the seat plate around the large joint and be folded on the socket. Therefore, the folding process of the seat is simpler, more convenient and more labor-saving through the armrest lock and the seat board lock which have ingenious structural design and reliable action matching.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an exploded perspective view of fig. 1.

Fig. 3 is a cross-sectional view of the seat in the unfolded use state with the back lock, the armrest lock, and the seat plate lock all locked.

Fig. 4 is a cross-sectional structural view of the backrest lock of fig. 3 unlocked, the backrest folded toward the seat plate and the armrest lock unlocked.

Fig. 5 is a schematic sectional view of the backrest of fig. 4 being folded to rotate the armrest around the small joint and fold on the seat plate, and the seat plate lock being unlocked.

Fig. 6 is a schematic cross-sectional view of the seat back in fig. 5 being folded to bring the folded armrests together with the seat board to be folded on the sockets around the large joints.

Fig. 7 is a schematic view of the external structure of fig. 3.

Fig. 8 is a schematic view of the completely folded external structure of the present invention.

Fig. 9 is an assembly structure diagram of the unlocking sheet, the unlocking spring, the return spring and the slider.

Fig. 10 is an enlarged view of the turn.

Fig. 11 is an enlarged view of the turntable.

Fig. 12 is an enlarged view of the rotating shaft.

Fig. 13 is a perspective view of the slider.

Fig. 14 is a perspective view of the socket.

Fig. 15 is a perspective view of the shift block.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the above drawings.

As shown in fig. 1 to 15, the seat back is 1, the seat back is 2, the seat board is 21, the guide rib is 3, the armrest is 4, the socket is 41, the mounting groove is 5, the back lock is 51, the handle is 52, the elastic pin is 6, the large joint is 61, the rotating ring is 611, the unlocking hole is 612, the trapezoidal block is 613, the inclined plane is 62, the rotating disc is 621, the gear groove is 622, the stop groove is 623, the stop notch is 624, the locking hole is 7, the small joint is 71, the rotating shaft is 711, the locking groove is 72, the rotating groove is 721, the through hole is 8, the armrest lock is 81, the unlocking plate is 811, the guide groove is 82, the sliding block is 821, the barb 822, the positioning protrusion is 83, the unlocking spring is 84, the return spring is 9, the seat board lock is 91, the gear block is 911, the locking column is 912, the inclined plane is 913, the rib is 92, the gear spring is 10, and the outer cover is 10.

A seat folding mechanism is mainly related to a folding mechanism suitable for a seat on a baby carriage, and comprises a backrest 1, a seat board 2, handrails 3, a socket 4 and the like, wherein the lower end of the backrest, the rear end of the seat board and the upper end of the socket are coaxially and rotatably connected through a large joint 6, the lower end of the handrail 3 is rotatably connected to the front end of the seat board 2 through a small joint 7, the socket 4 is detachably inserted on the baby carriage frame and is an auxiliary component for assisting the seat to be installed on the baby carriage frame, and when the backrest 1 rotates relative to the socket 4, the handrails 3 and the seat board 2 can be integrally linked and folded.

In the seat, two sets of seat folding mechanisms are generally adopted and are respectively arranged on two sides of the seat, and the structure of each seat folding mechanism is completely the same, so that the embodiment will be described in detail by taking the seat folding mechanism on one side as an example, and the left side of the seat in the view shown in fig. 1 is taken as the front side of the seat and the right side of the seat in the view is taken as the rear side of the seat in the seating position of the seat.

The large joint 6 comprises a rotary ring 61 arranged at the lower end of the backrest 1 and a rotary disc 62 arranged on the outer end face of the rear end of the seat plate 2, the rotary disc 62 and the rotary ring 61 are both circular parts, and after the rotary disc 62, the rotary ring 61 and the upper end of the socket 4 are sequentially assembled from inside to outside, the rotary disc 62 and the rotary ring 61 can rotate coaxially after being connected through a connecting shaft which sequentially penetrates through the upper end of the socket 4 and the rotary ring 61 and is connected to the circle center of the rotary disc 62.

The small joint 7 comprises a rotating shaft 71 arranged on the outer end surface of the lower end of the handrail 3 and a rotating groove 72 arranged on the inner end surface of the front end of the seat plate 2, and the rotating shaft and the rotating groove are also designed into a circular shape, so that after the rotating shaft 71 is assembled in the rotating groove 72, the rotating shaft is also coaxially and rotatably connected through a bolt arranged at the center of a circle; the outer circumference of the rotating shaft 71 is provided with a locking groove 711, and the inner circumference of the rotating groove 72 is provided with a through hole 721.

The backrest 1 is internally provided with a backrest lock 5, the large joint 6 is internally provided with a seat plate lock 9, and the seat plate 2 is provided with an armrest lock 8.

And, when the armrest lock 8 is fitted in the lock groove 711 of the rotary shaft 71 through the through hole 721 of the rotary groove 72, the relative rotation of the rotary shaft 71 and the rotary groove 72, that is, the rotation of the armrest 3 relative to the seat plate 2, is locked; when the armrest lock 8 is disengaged from the lock groove 72, the relative rotation of the rotary shaft 71 and the rotary groove 72, that is, the rotation of the armrest 3 relative to the seat plate 2, is unlocked.

The armrest lock 8 includes an unlocking plate 81 disposed on the seat plate 2, a sliding block 82 mounted at the rear end of the unlocking plate, an unlocking spring 83 for elastically pushing the sliding block to move backward, a return spring 84 with two ends elastically pushing between the sliding block 82 and the unlocking plate 81, and an unlocking hole 611 disposed on the outer circumferential surface of the rotary ring 61.

Usually, the rear end of the sliding block 82 is elastically pushed by the unlocking spring 83 to contact the outer circumferential surface of the rotating ring 61, and at this time, the front end of the unlocking piece 81 passes through the through hole 721 to be assembled in the locking groove 711 to lock the relative rotation of the rotating shaft 71 and the rotating groove 72, and once the unlocking hole 611 is driven to face the sliding block 72 along with the rotation of the rotating ring 61 relative to the rotating disc 62, the rear end of the sliding block is pushed by the unlocking spring 83 to move backwards to enter the unlocking hole 611 and drive the unlocking piece 81 to move backwards synchronously, so as to drive the front end of the unlocking piece to be separated from the assembly of the locking groove 711 to unlock the relative rotation of the rotating shaft 71 and the rotating groove 72.

The unlocking piece 81 is a metal piece in a transverse H shape, that is, two legs of the H shape are just the front end and the rear end of the unlocking piece, obviously, in order to match the two legs of the H shape, two through holes 721 need to be designed on the rotating groove 72, and two corresponding locking grooves 711 need to be designed on the rotating shaft 71.

The unlocking sheet 81 is provided with a rectangular guide groove 811 extending along a front-back straight line, the outer end face of the seat plate 2 is provided with a guide rib 21 penetrating into the guide groove 811, and the purpose of designing the structure is as follows: firstly, the unlocking plate 81 is used for moving and guiding, and secondly, the unlocking spring 83 pushes the sliding block 82 to move backwards, namely, the front end of the unlocking spring 83 pushes the guiding rib 21 elastically, the rear end of the unlocking spring 83 pushes the sliding block 82 elastically, so that the sliding block 82 always has the tendency of moving backwards due to the elastic pushing of the unlocking spring 83.

The front end of the sliding block 82 is hooked with the rear end of the unlocking sheet 81 through the barb 821, that is, the two components are linked, in the actual structure, the rear end of the unlocking spring 83 is elastically pushed on the sliding block 82, and the two ends of the return spring 84 are respectively elastically pushed on the H-shaped rear end of the unlocking sheet 81 and the sliding block 82, so that the sliding block 82 can be moved and reset.

The outer circumferential surface of the turntable 62 is provided with a stop notch 623, and when the rear end of the slide block 82 passes through the unlocking hole 611 to be assembled in the stop notch 623 by the positioning protrusion 822, the unlocking state of the armrest lock 8 can be better locked, that is, the folded armrest 3 can not drive the slide block 82 to be separated from the unlocking hole 611 and unfolded accidentally.

The outer end face of the seat board 2 is provided with an outer cover 10 which can seal the whole handrail lock 8, thereby not only having beautiful appearance, but also preventing the handrail lock from being damaged.

The seat plate lock 9 comprises a gear block 91, in order to ensure the balance of the unlocking action, the embodiment totally designs two gear blocks 91 with the same structure, each gear block is installed in the installation groove 41 of the inner end surface of the upper end of the socket 4 through a gear spring 92, so that the gear blocks 91 can be elastically pushed by the gear springs to form a trend of moving inwards, and the inner end surface of each gear block 91 is provided with a lock column 911 and a slope 912, wherein the lock column 911 and the slope 912 are coaxially designed, and the slope is arranged on one side of the lock column.

Meanwhile, a trapezoidal block 612 protruding towards the outer end face is arranged in the rotating ring 61, and a locking hole 624 is arranged on the inner end face of the rotating disc 62; thus, when the gear position block 91 is pushed by the gear position spring 92 to move inwards, the lock post 911 is driven to pass through the rotating ring 61 and be assembled in the lock hole 624, so that the relative rotation between the rotary disc 62 and the upper end of the socket 4 is locked, and the structure is designed to ensure the normal use of the seat in the unfolding state; when the rotating ring 61 rotates and folds relative to the rotating disc 62, the inclined plane 613 of the trapezoidal block 612 is driven to push the slope 912, and the slope is guided to climb along the inclined plane 613 of the trapezoidal block 612, so that the slope is converted into outward movement of the driving gear block 91, and the lock post 911 is driven to be separated from the lock hole 624, so that the relative rotation between the rotating disc 62 and the upper end of the socket 4 can be unlocked, and the folding operation between the seat plate 2 and the socket 4 is ensured.

The outer surface of each shift block 91 is provided with an axially extending rib 913, which mainly serves the purpose that the shift block 91 can only move outwards and cannot rotate when climbing along the inclined surface 613 of the trapezoidal block 612 via the ramp 912.

The backrest lock 5 comprises a handle 51 arranged at the top of the backrest, an elastic pin 52 arranged at the bottom of the backrest and driven to move by the handle, and a plurality of gear slots 621 arranged on the outer circumferential surface of the turntable 62, and when the handle 51 drives the elastic pin 52 to be selectively assembled in the gear slots 621, the use and adjustment of the backrest angle can be realized; when the handle 51 drives the elastic pins 52 to disengage from the plurality of gear slots 621, the backrest 1 can be operated to rotate and fold around the large joint 6 towards the socket 4.

Of course, the outer circumferential surface of the rotating disc 62 is further provided with a stop groove 622, which functions as: when the backrest 1 rotates the folded armrest 3 together with the seat plate 2 around the large joint 6 to fold on the socket 4, the elastic pin 52 can be fitted in the stop slot 622 to lock the folded state of the whole seat.

Obviously, according to the above structural and motion analysis, the unlocking hole 611 designed in this embodiment is located near the top of the rotating ring 61, and the plurality of the stop grooves 621, the stop grooves 622 and the stop notches 623 are sequentially designed on the outer circumferential surface of the rotating disc 62 from back to front.

When the seat is in a unfolding state, the use angle adjustment of the backrest 1 relative to the seat plate 2 is ensured through the selective assembly of the elastic pin 52 in the plurality of gear position grooves 621, and as long as the elastic pin 52 does not depart from the stroke distance of the plurality of gear position grooves 621, particularly, does not rotate anticlockwise to exceed the gear position groove 621 at the final end position, the whole backrest lock 5 cannot be completely unlocked; meanwhile, because the backrest lock 5 is not unlocked, the rear end of the sliding block 82 is always contacted on the outer circumferential surface of the rotating ring 61, the front end of the unlocking piece 81 is also always assembled in the locking groove 711 to lock the relative rotation of the rotating shaft 71 and the rotating groove 72, namely the armrest lock 8 is not unlocked to ensure the unfolding use of the armrest 3 relative to the seat plate 2; each corresponding gear block 91 is pushed by the elasticity of the gear spring 92 to drive the lock post 911 to be assembled in the lock hole 624 of the rotary disc 62, and at this time, the slope 912 on the gear block 91 is not in contact with the trapezoidal block 612 in the rotary ring 61, so that the seat plate lock 9 is not unlocked, and the seat plate 2 can be unfolded for use relative to the socket 4.

When the seat needs to be folded, the backrest lock 5 is firstly unlocked, that is, the handle 51 is pulled upwards to drive the elastic pin 52 to be separated from the gear groove 621, so that the backrest 1 rotates anticlockwise to be folded towards the socket 4, in the anticlockwise rotating process of the backrest 1, the rotating ring 61 drives the unlocking hole 611 to be over against the sliding block 82 along with the anticlockwise rotation, so that the sliding block 82 pushed elastically by the unlocking spring 83 moves inwards to enter the unlocking hole 611, and then the unlocking sheet 81 is synchronously pulled inwards to drive the front end of the unlocking sheet to be separated from the locking groove 711 on the armrest 3, that is, the armrest lock 8 is synchronously unlocked, the armrest 3 rotates around the small joint 7 along with the driving of the backrest 1 to be folded on the seat plate 2, then the backrest 1 continues to rotate anticlockwise to drive the trapezoidal block 612 in the rotating ring 61 to contact with the slope 912 at the inner end of the gear block 91, the gear block 91 is pushed outwards by the structural principle of inclined plane climbing and pushing movement, and drive lock post 911 to break away from lockhole 624 on the carousel 62, then seat board lock 9 is also unlocked, then the back 1 of anticlockwise rotation all the time will drive folding handrail 3 and seat board 2 and rotate around big joint 6 together and fold on socket 4, accomplish the complete folding of seat at last, and handrail 3 relative seat board 2 fold condition that handrail lock 8 unblock realized can be guaranteed by slider 82 front end entering stop gap 623, seat board 2 relative socket 4 fold condition that seat board lock 9 unblock realized can be guaranteed by spring pin 52 entering stop groove 622.

Therefore, the folding process of the seat is simpler, more convenient and more labor-saving through the armrest lock and the seat board lock which have ingenious structural design and reliable action matching.

The above description is only a specific embodiment of the present invention, and those skilled in the art should understand that any similar structural design to the embodiment is included in the protection scope of the present invention.

Claims (10)

1. A seat folding mechanism comprises a backrest (1), a seat board (2), armrests (3) and a socket (4), wherein the lower end of the backrest (1), the rear end of the seat board (2) and the upper end of the socket (4) are coaxially and rotatably connected through a large joint (6), and the lower ends of the armrests (3) are rotatably connected to the front end of the seat board (2) through a small joint (7); the chair is characterized in that the backrest lock (5) is unlocked, the backrest (1) rotates towards the socket (4) around the large joint (6), the armrest lock (8) is unlocked to drive the armrest (3) to rotate around the small joint (7) and be folded on the seat plate (2), and the seat plate lock (9) is unlocked to drive the folded armrest (3) to rotate together with the seat plate (2) around the large joint (6) and be folded on the socket (4).

2. A seat folding mechanism according to claim 1, characterized in that said large joint (6) comprises a swivel (61) provided at the lower end of the backrest (1) and a swivel plate (62) provided at the rear end of the seat plate (2); the upper ends of the turntable (62), the rotating ring (61) and the socket (4) are sequentially assembled and connected, and the turntable (62) and the rotating ring (61) rotate coaxially.

3. A seat folding mechanism according to claim 2, characterized in that said facet joint (7) comprises a pivot shaft (71) provided at the lower end of the armrest (3) and a pivot slot (72) provided at the front end of the seat plate (2), which pivot shaft fits in the pivot slot and is connected in a coaxial pivotal connection.

4. A seat folding mechanism according to claim 3, characterized in that the outer circumference of the rotary shaft (71) is provided with a locking groove (711), and the inner circumference of the rotary groove (72) is provided with a through hole (721); the armrest lock (8) is assembled in the lock groove (711) through the through hole (721) to lock the relative rotation of the rotating shaft (71) and the rotating groove (72); the armrest lock (8) is separated from the lock groove (711) to unlock the relative rotation of the rotating shaft (71) and the rotating groove (72).

5. The seat folding mechanism according to claim 4, wherein the armrest lock (8) comprises an unlocking plate (81) disposed on the seat plate (2), a slider (82) mounted at the rear end of the unlocking plate, an unlocking spring (83) elastically pushing the slider to move backward, a return spring (84) having two ends elastically pushing between the slider (82) and the unlocking plate (81), and an unlocking hole (611) disposed on the outer circumferential surface of the turn ring (61); the rear end of the sliding block (82) is elastically pushed and contacted on the outer circumferential surface of the rotating ring (61), and the front end of the unlocking sheet (81) passes through the through hole (721) to be assembled in the locking groove (711) to lock the relative rotation of the rotating shaft (71) and the rotating groove (72); the rear end of the sliding block (82) is pushed by elasticity to move backwards to enter the unlocking hole (611), the sliding block (82) drives the unlocking sheet (81) to move backwards synchronously, and then the front end of the unlocking sheet (81) is driven to be separated from the assembly of the locking groove (711) to unlock the relative rotation of the rotating shaft (71) and the rotating groove (72).

6. The seat folding mechanism according to claim 5, characterized in that the unlocking plate (81) is provided with a guide groove (811) extending along a straight line in the front-back direction, the seat plate (2) is provided with a guide rib (21) penetrating into the guide groove (811), the front end of the unlocking spring (83) is elastically pushed against the guide rib (21), and the rear end of the unlocking spring is elastically pushed against the sliding block (82).

7. A seat folding mechanism according to claim 5, characterized in that the outer circumference of the rotary plate (62) is provided with a stop notch (623), and the rear end of the slide block (82) passes through the unlocking hole (611) and is assembled in the stop notch (623).

8. The seat folding mechanism according to claim 2, characterized in that the seat lock (9) comprises a gear block (91) which is installed on the inner end surface of the upper end of the socket (4) and is elastically pushed to move inwards, the inner end surface of the gear block is provided with a lock column (911) and a slope (912) arranged on one side of the lock column, a trapezoidal block (612) protruding towards the outer end surface is correspondingly arranged in the rotating ring (61), and the inner end surface of the rotating disc (62) is provided with a lock hole (624); the gear block (91) is pushed by elasticity to move inwards and drives the lock column (911) to be assembled in the lock hole (624) so as to lock the relative rotation of the turntable (62) and the upper end of the socket (4); the rotating ring (61) rotates relative to the rotating disc (62), the inclined surface (613) of the trapezoidal block (612) pushes the slope (912) to drive the gear block (91) to move outwards, and the lock column (911) is driven to be separated from the lock hole (624) to unlock the relative rotation of the rotating disc (62) and the upper end of the socket (4).

9. A seat folding mechanism according to claim 2, characterized in that said backrest lock (5) comprises a handle (51) disposed on the top of the backrest (1), a resilient pin (52) disposed on the bottom of the backrest and driven by the handle to move, and a plurality of shift grooves (621) disposed on the outer circumferential surface of the rotary plate (62), said handle (51) driving the resilient pin (52) to selectively fit in the plurality of shift grooves (621) to adjust the angle of the backrest (1); the handle (51) drives the elastic pins (52) to be separated from the plurality of gear grooves (621), and the backrest (1) rotates around the large joint (6) to be folded towards the socket (4).

10. The seat folding mechanism according to claim 9, characterized in that the outer circumference of the rotary disc (62) is provided with a stop groove (622), the backrest (1) drives the folded armrest (3) and the seat plate (2) to rotate around the large joint (6) and fold on the socket (4), and the elastic pin (52) is assembled in the stop groove (622) to lock.

Images