阅读说明：本技术 一种汽车可折叠座椅 (Foldable seat of automobile ) 是由 蔡永忠 钱军 于 2019-11-25 设计创作，主要内容包括：本发明属于汽车座椅技术领域,尤其涉及一种汽车可折叠座椅,它包括通过四个支撑腿安装在汽车内底板上侧的椅座、安装在椅座后侧的椅背,本发明设计的折叠座椅,适用于现有三排座椅的车辆,将调节座椅安装在中间排两个座椅的中间位置,当位于后排的乘客需要上下车的时候,调节限位安装盘对椅座和椅背解除限位,之后,手动向前扳动椅背,使得椅背相对椅座摆动,椅背通过传动机构使得四个支撑腿同时保持相同的幅度相对椅座摆动；将折叠座椅折起,平铺于汽车内底板上,为后排乘客提供一个较大的上下车通道,保证后排乘客的顺利上下。(The invention belongs to the technical field of automobile seats, and particularly relates to an automobile foldable seat which comprises a seat arranged on the upper side of an inner bottom plate of an automobile through four supporting legs and a seat back arranged on the rear side of the seat; the folding seat is folded and laid on the inner bottom plate of the automobile, a larger getting-on/off passage is provided for passengers in the back row, and smooth getting-on/off of the passengers in the back row is ensured.)

1. The utility model provides a collapsible seat of car, it includes installs the seat support at car inner bottom plate upside, installs the back of the chair at the seat support rear side through four supporting legs, its characterized in that: the lower ends of the four supporting legs are mounted on an automobile inner bottom plate in a hinged mode, and the upper ends of the four supporting legs are mounted with the seat in a hinged mode; the lower end of the chair back is hinged and installed at the rear side of the chair seat through two hinge plates which are symmetrically distributed; the two hinged plates are fixedly arranged on the chair seat; the upper end of the chair back is provided with a treading shell, and treading cloth is wound in the treading shell; two adjusting devices which are used for controlling the treading cloth to be pulled out from the treading shell and spread on the rear side surface of the chair back are symmetrically arranged on the lower side of the chair seat; one end of the rear side of the chair seat is provided with a transmission mechanism consisting of a chain and a chain wheel, and the forward swing of the chair back controls the four supporting legs to swing backwards relative to the chair seat through the transmission mechanism; the other end of seat support rear side installs stop gear, and when people normally sat on the seat support, stop gear played the limiting displacement to the swing of the back of the chair and four supporting legs.

2. The foldable seat for vehicle as claimed in claim 1, wherein: the hinged shaft for connecting the chair back and the two hinged plates is a first hinged shaft, and the first hinged shaft is fixedly connected with the chair back; articulated shafts at the ends of the four supporting legs, which are articulated with the base, are fourth articulated shafts, and the fourth articulated shafts are fixedly connected with the corresponding supporting legs;

the transmission mechanism comprises a first chain, a second chain, a third chain, a first chain wheel, a second chain wheel, a third chain wheel, a fourth chain wheel, a fifth chain wheel, a sixth chain wheel, a second articulated shaft and a third articulated shaft, wherein the first chain wheel is fixedly arranged at one end of the first articulated shaft, the second articulated shaft is rotatably arranged at one side of the chair seat, the third chain wheel is arranged at one end of the second articulated shaft, and the third chain wheel is connected with the first chain wheel through the third chain; the second chain wheel is arranged at the other end of the second hinge shaft, the third hinge shaft is arranged at one side of the chair seat through rotating fit, the fifth chain wheel is arranged at one end of the third hinge shaft, and the fifth chain wheel is connected with the second chain wheel through a first chain; the sixth chain wheel is arranged at the other end of the third hinged shaft, the fourth chain wheel is arranged on the fourth hinged shaft, and the fourth chain wheel is connected with the sixth chain wheel through a second chain.

3. The foldable seat for vehicle as claimed in claim 1, wherein: a plurality of first limiting holes are uniformly formed in the circumferential direction on the end face of the lower end of the chair back, which is not provided with the transmission mechanism;

the limiting mechanism comprises a limiting mounting disc, a limiting fixing plate and a limiting rod, wherein a plurality of second limiting holes are uniformly formed in one end of the limiting fixing plate in the circumferential direction, the other end of the limiting fixing plate is fixedly mounted on the base, and after the chair back is swung up, the second limiting holes formed in the limiting fixing plate are aligned with the first limiting holes formed in the chair back in a one-to-one correspondence mode; a plurality of limiting rods are uniformly arranged at one end of the limiting mounting disc in the circumferential direction, and the limiting mounting disc is arranged on one side of the seat through the one-to-one nesting and matching of the limiting rods and the first limiting holes in the seat back and the second limiting holes in the limiting fixing disc.

4. The foldable seat for vehicle as claimed in claim 1, wherein: the pedal shell is internally provided with a mounting groove, two shaft holes are symmetrically formed in the end surfaces of two sides of the mounting groove, mounting cavities are formed in the inner end surfaces of the two shaft holes, and an outlet communicated with the outer side is formed in the circular surface of the mounting groove; the fixed rotating shaft is arranged in the treading shell through two shaft holes, the treading cloth is wound on the fixed rotating shaft, two brace bars are symmetrically arranged at one end of the treading cloth extending out of the outlet, and the two brace bars are connected with the two adjusting devices in a one-to-one correspondence manner; the both ends of fixed pivot are located two installation chambeies, and install a volute spiral spring between the both ends of fixed pivot and two installation chambeies respectively, and volute spiral spring's inner fixed mounting is on the outer disc of fixed pivot, and volute spiral spring's outer end fixed mounting is on the disc that corresponds the installation chamber.

5. The foldable seat for vehicle as claimed in claim 1, wherein: the adjusting device comprises a sliding block, a pull rope, a guide rail and a movable pulley, wherein one end of the guide rail is provided with a rope hole, the guide rail is fixedly arranged at the lower side of the chair seat, the sliding block is arranged in the guide rail in a sliding fit manner, the movable pulley is arranged on the sliding block, and one end of the corresponding pull cloth is fixedly connected with the lower end surface of the chair seat by bypassing the movable pulley; one end of the pull rope is fixedly arranged on the sliding block, and the other end of the pull rope penetrates through a rope hole formed in the guide rail and is fixedly connected with the automobile inner bottom plate.

6. The foldable seat for vehicle as claimed in claim 5, wherein: two guide grooves are symmetrically formed in the guide rail; two guide blocks are symmetrically arranged on two sides of the sliding block, and the sliding block is arranged in the guide rail through the sliding fit of the two guide blocks and the two guide grooves.

7. The foldable seat for vehicle as claimed in claim 5, wherein: the fixed pulley is arranged on the lower side of the chair back, and plays a role in guiding the corresponding pull cloth.

8. The foldable seat for vehicle as claimed in claim 5, wherein: the guide wheels are arranged on the lower side of the chair back and play a role in guiding the pull ropes.

9. The foldable seat for vehicle as claimed in claim 2, wherein: the diameter of the first chain wheel is smaller than that of the third chain wheel, and the diameters of the second chain wheel, the third chain wheel, the fourth chain wheel, the fifth chain wheel and the sixth chain wheel are equal.

10. The foldable seat for vehicle as claimed in claim 5, wherein: the pull rope is a steel wire rope.

Technical Field

The invention belongs to the technical field of automobile seats, and particularly relates to a foldable automobile seat.

Background

With the importance of people on the quality of life and health index in the current society, the requirements on the comfort and the driving experience of automobiles are higher and higher. The seat is an indispensable component of the automobile, and can adjust the backrest of the seat and adjust the angle of the backrest to meet the riding requirements of different passengers, so that the aim of facilitating the passengers is fulfilled.

For a conventional three-row seat vehicle, when a passenger wants to enter a rear row in the vehicle, three methods are roughly classified: one way is for a car with two seats in the second row to enter the rear row through a passage in the middle of the seats in the second row, so that the second row has only two seats; the second method is to fold the seat back of one of the seats in the second row and properly adjust the front and rear positions of the seat for the passenger to enter, but this method has limited folding angle of the seat and cannot completely lay flat, which affects the getting on and off of the passenger in the rear row to some extent, and if the passenger carelessly steps on the folded seat when getting on or off, the rear side of the seat back sticks with dirt, and the passenger in the rear row may get dirty by not noticing the dirt on the seat back after sitting down. In the third method, for a seat with three seats in the second row, a small seat close to the doorway is lifted towards the inner plate and vertically leaned against the middle seat, a channel is formed between the upper doorway and the rear seat to provide passengers on the rear seat to get on and off the vehicle, but the width of the channel formed by the method after the small seat close to the vehicle door is limited, the channel is not beneficial to getting on and off the passengers on the rear row after being folded inwards, the size of the channel is smaller than that of a normal seat and the channel is installed on an adjacent seat for the convenience of folding, and the safety is not high; the folding seat designed by the invention is used in a traditional automobile with two seats in the second row, is used as a newly-added seat in the middle position of the two seats, allows passengers to enter the rear row through the middle by folding, simultaneously swings the seat and the supporting legs of the seat downwards while downwards folding the seat back, is flatly paved on the inner bottom plate of the automobile, provides a larger getting-on/off passage for the passengers in the rear row, and simultaneously pulls out the stepping cloth stored in the stepping shell on the seat back when not folded to be paved on the seat back for the passengers in the rear row to get on/off the automobile.

The invention designs a foldable seat of an automobile to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a foldable seat of an automobile, which is realized by adopting the following technical scheme.

The utility model provides a collapsible seat of car, it includes installs the seat support at car inner bottom plate upside, installs the back of the chair at the seat support rear side through four supporting legs, its characterized in that: the lower ends of the four supporting legs are mounted on an automobile inner bottom plate in a hinged mode, and the upper ends of the four supporting legs are mounted with the seat in a hinged mode; the four supporting legs can swing and fold relative to the chair seat; the lower end of the chair back is hinged and installed at the rear side of the chair seat through two hinge plates which are symmetrically distributed; the chair back can swing and fold relative to the chair seat through the two hinged plates; the two hinged plates are fixedly arranged on the chair seat; the upper end of the chair back is provided with a treading shell, and treading cloth is wound in the treading shell; two adjusting devices which are used for controlling the treading cloth to be pulled out from the treading shell and spread on the rear side surface of the chair back are symmetrically arranged on the lower side of the chair seat; one end of the rear side of the chair seat is provided with a transmission mechanism consisting of a chain and a chain wheel, and the forward swing of the chair back controls the four supporting legs to swing backwards relative to the chair seat through the transmission mechanism; the other end of seat support rear side installs stop gear, and when people normally sat on the seat support, stop gear played the limiting displacement to the swing of the back of the chair and four supporting legs.

As a further improvement of the technology, a hinge shaft for connecting the chair back and the two hinge plates is a first hinge shaft, and the first hinge shaft is fixedly connected with the chair back; the articulated shaft of four supporting legs and the articulated one end of base is the fourth articulated shaft, and fourth articulated shaft and the supporting leg fixed connection who corresponds.

The transmission mechanism comprises a first chain, a second chain, a third chain, a first chain wheel, a second chain wheel, a third chain wheel, a fourth chain wheel, a fifth chain wheel, a sixth chain wheel, a second articulated shaft and a third articulated shaft, wherein the first chain wheel is fixedly arranged at one end of the first articulated shaft, the second articulated shaft is rotatably arranged at one side of the chair seat, the third chain wheel is arranged at one end of the second articulated shaft, and the third chain wheel is connected with the first chain wheel through the third chain; the second chain wheel is arranged at the other end of the second hinge shaft, the third hinge shaft is arranged at one side of the chair seat through rotating fit, the fifth chain wheel is arranged at one end of the third hinge shaft, and the fifth chain wheel is connected with the second chain wheel through a first chain; the sixth chain wheel is arranged at the other end of the third hinged shaft, the fourth chain wheel is arranged on the fourth hinged shaft, and the fourth chain wheel is connected with the sixth chain wheel through a second chain.

The diameter of the first chain wheel is smaller than that of the third chain wheel, and the diameters of the second chain wheel, the third chain wheel, the fourth chain wheel, the fifth chain wheel and the sixth chain wheel are equal, so that the four supporting legs are in a vertical state relative to the seat in a normally unfolded state, the back of the chair is in a backward inclined state relative to the seat in a normally unfolded state, and when the chair is folded, the angle of swing of the back of the chair relative to the seat is larger than that of the four supporting legs relative to the seat.

As a further improvement of the technology, a plurality of first limiting holes are uniformly formed in the circumferential direction on the end face of the lower end of the chair back, which is not provided with the transmission mechanism.

The limiting mechanism comprises a limiting mounting disc, a limiting fixing plate and a limiting rod, wherein a plurality of second limiting holes are uniformly formed in one end of the limiting fixing plate in the circumferential direction, the other end of the limiting fixing plate is fixedly mounted on the base, and after the chair back is swung up, the second limiting holes formed in the limiting fixing plate are aligned with the first limiting holes formed in the chair back in a one-to-one correspondence mode; a plurality of limiting rods are uniformly arranged at one end of the limiting mounting disc in the circumferential direction, and the limiting mounting disc is arranged on one side of the seat through the one-to-one nesting and matching of the limiting rods and the first limiting holes in the seat back and the second limiting holes in the limiting fixing disc.

When people normally sit on the chair seat, the limiting rods arranged on the limiting mounting disc are inserted into the first limiting holes in the chair back and the second limiting holes in the limiting fixing disc in a one-to-one correspondence mode, the chair back and the limiting fixing disc are limited in the rotating direction around the axis of the first hinge shaft through the limiting rods, and under the condition, the chair back is in a static state relative to the chair seat, and people can normally lean on the chair back.

As a further improvement of the technology, the treading shell is internally provided with a mounting groove, two shaft holes are symmetrically formed on the end surfaces of two sides of the mounting groove, the inner end surfaces of the two shaft holes are respectively provided with a mounting cavity, and the circular surface of the mounting groove is provided with an outlet communicated with the outside; the fixed rotating shaft is arranged in the treading shell through two shaft holes, the treading cloth is wound on the fixed rotating shaft, two brace bars are symmetrically arranged at one end of the treading cloth extending out of the outlet, and the two brace bars are connected with the two adjusting devices in a one-to-one correspondence manner; two ends of the fixed rotating shaft are positioned in the two mounting cavities, a volute spiral spring is respectively mounted between the two ends of the fixed rotating shaft and the two mounting cavities, the inner end of the volute spiral spring is fixedly mounted on the outer circular surface of the fixed rotating shaft, and the outer end of the volute spiral spring is fixedly mounted on the circular surface of the corresponding mounting cavity; the volute spiral spring plays a role in recovering the treading cloth.

As a further improvement of the technology, the adjusting device comprises a sliding block, a pull rope, a guide rail and a movable pulley, wherein one end of the guide rail is provided with a rope hole, the guide rail is fixedly arranged at the lower side of the chair seat, the sliding block is arranged in the guide rail in a sliding fit manner, the movable pulley is arranged on the sliding block, and one end of the corresponding pull cloth is fixedly connected with the lower end surface of the chair seat by bypassing the movable pulley; one end of the pull rope is fixedly arranged on the sliding block, and the other end of the pull rope penetrates through a rope hole formed in the guide rail and is fixedly connected with the automobile inner bottom plate.

According to the invention, through the arranged movable pulley, when the sliding block slides forwards for a certain distance relative to the guide rail, the distance of the treading cloth pulled out is 2 times of the moving distance of the sliding block, so that the distance of the sliding block required to move when the treading cloth is fully paved on the rear side of the chair back is reduced, namely the occupied length of the track on the chair seat is reduced. When the chair back is lifted upwards, the chair seat moves upwards obliquely relative to the inner bottom plate of the automobile, the pull rope retracts, the slide block moves backwards, and the treading cloth is reset under the action of the volute spiral spring.

As a further improvement of the technology, two guide grooves are symmetrically formed in the guide rail; two guide blocks are symmetrically arranged on two sides of the sliding block, and the sliding block is arranged in the guide rail through the sliding fit of the two guide blocks and the two guide grooves.

As a further improvement of the technology, the fixed pulley is arranged on the lower side of the chair back, and plays a role in guiding the corresponding pull cloth.

As a further improvement of the technology, the lower side of the chair back is provided with a guide wheel which plays a role in guiding the pull rope.

As a further improvement of the technology, the diameter of the first chain wheel is smaller than that of the third chain wheel, and the diameters of the second chain wheel, the third chain wheel, the fourth chain wheel, the fifth chain wheel and the sixth chain wheel are equal.

As a further improvement of the technology, the pull rope is a steel wire rope; the steel wire rope is relatively firm and is not easy to break; the steel wire rope is relatively firm and is not easy to break.

Compared with the traditional automobile seat technology, the beneficial effects of the design of the invention are as follows:

1. the folding seat designed by the invention is suitable for the existing three-row seat vehicle, the adjusting seat is arranged in the middle position of two seats in the middle row, when passengers in the back row need to get on or off the vehicle, the limiting mounting disc is adjusted to relieve the limiting on the seat and the seat back, then the seat back is manually pulled forwards to enable the seat back to swing relative to the seat, and the seat back enables four supporting legs to simultaneously keep the same amplitude to swing relative to the seat through a transmission mechanism; the folding seat is folded and laid on the inner bottom plate of the automobile, a larger getting-on/off passage is provided for passengers in the back row, and smooth getting-on/off of the passengers in the back row is ensured.

2. According to the folding seat, when the seat back swings forwards relative to the seat, and is not folded, the treading cloth stored in the treading shell on the seat back is pulled out and spread on the seat back through the adjustment of the adjusting device, so that passengers in the back row can get on or off the seat to tread; the folding seat prevents the back side of the seat back from being adhered with dirt if passengers step on the folded seat carelessly when getting on or off the vehicle, and clothes are possibly dirtied due to the fact that the passengers in the back row do not notice the dirt on the seat back when the seat is in an unfolded state and the passengers in the back row sit down.

3. Compared with the traditional method of swinging up the small side-edge seat, the folding seat designed by the invention has the advantages that when a passenger in a rear row gets on or off the vehicle, a channel formed after the seat is folded is wider, and the passenger can get on or off the vehicle more conveniently; compared with a folding chair which is folded at a certain small angle, after the folding chair is folded, the chair back, the chair seat and the four supporting legs are in a flat state relative to the bottom plate in the automobile, and the whole height after the flat state is relatively low, so that people can more conveniently pass through the folding chair.

4. The folding seat designed by the invention is a traditional automobile with the side small seats arranged in a swinging way, the small seats are fixed on the side seats in the same row in a hinged way, the safety is relatively low, and the safety of the seat is ensured by fixing the seat on the inner bottom plate of the automobile through a reasonable design.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is a schematic view of the transmission and the adjustment device.

Fig. 3 is a schematic view of the installation of the transmission mechanism and the limiting mechanism.

Fig. 4 is a schematic diagram of the transmission mechanism.

Fig. 5 is a schematic structural diagram of the limiting mechanism.

Fig. 6 is a schematic view of a chair back structure.

Fig. 7 is a schematic diagram of the regulating device distribution.

Fig. 8 is a schematic view of the fixed and movable pulley installation.

Number designation in the figures: 1. a chair back; 2. a chair seat; 3. supporting legs; 4. an automotive underbody; 5. a transmission mechanism; 6. an adjustment device; 7. a limiting mechanism; 8. a hinge plate; 9. a first hinge shaft; 10. a first chain; 11. a second chain; 12. bracing; 13. a third chain; 14. a first chain wheel; 15. a second hinge shaft; 16. a second chain wheel; 17. a third chain wheel; 18. a third hinge shaft; 19. a fourth chain wheel; 20. a fourth hinge shaft; 21. a fifth chain wheel; 22. a sixth chain wheel; 27. a limiting mounting disc; 28. a first limit hole; 29. a limiting fixing plate; 30. a second limiting hole; 31. a limiting rod; 32. a mounting cavity; 33. mounting grooves; 34. a shaft hole; 35. treading the shell; 36. an outlet; 37. treading the cloth; 38. a volute spiral spring; 39. fixing the rotating shaft; 40. a fixed pulley; 41. a slider; 42. pulling a rope; 43. a guide rail; 44. a guide wheel; 45. a rope hole; 46. a guide groove; 47. a guide block; 48. a movable pulley.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in figure 1, it includes and installs at the seat support 2 of 4 upsides of bottom plate in the car, installs the back of the chair 1 at 2 rear sides of seat support through four supporting legs 3, its characterized in that: as shown in fig. 1 and 2, the lower ends of the four support legs 3 are mounted on an automobile inner bottom plate 4 in a hinged manner, and the upper ends of the four support legs 3 are mounted with the seat 2 in a hinged manner; the four supporting legs 3 can swing and fold relative to the seat 2; the lower end of the chair back 1 is hinged and installed at the rear side of the chair seat 2 through two hinge plates 8 which are symmetrically distributed; the chair back 1 can swing and fold relative to the chair seat 2 through the two hinged plates 8; the two hinged plates 8 are fixedly arranged on the chair seat 2; a treading shell 35 is arranged at the upper end of the chair back 1, and treading cloth 37 is wound in the treading shell 35; two pieces of control treading cloth 37 are symmetrically arranged at the lower side of the chair seat 2, are pulled out from the treading shell 35 and are paved on the adjusting device 6 at the rear side surface of the chair back 1; as shown in fig. 2 and 3, a transmission mechanism 5 composed of a chain and a chain wheel is installed at one end of the rear side of the seat 2, and the chair back 1 swings forwards and controls the four support legs 3 to swing backwards and fold relative to the seat 2 through the transmission mechanism 5; stop gear 7 is installed to the other end of 2 rear sides of seat supports, and when people normally sat on seat support 2, stop gear 7 played limiting displacement to the swing of the back of the chair 1 and four supporting legs 3.

As shown in fig. 4, the hinge shaft connecting the chair back 1 and the two hinge plates 8 is a first hinge shaft 9, and the first hinge shaft 9 is fixedly connected with the chair back 1; the articulated shaft of four supporting legs 3 and the articulated one end of base is fourth articulated shaft 20, and fourth articulated shaft 20 and the supporting leg 3 fixed connection who corresponds.

As shown in fig. 4, the transmission mechanism 5 includes a first chain 10, a second chain 11, a third chain 13, a first chain wheel 14, a second chain wheel 16, a third chain wheel 17, a fourth chain wheel 19, a fifth chain wheel 21, a sixth chain wheel 22, a second hinge shaft 15, and a third hinge shaft 18, wherein the first chain wheel 14 is fixedly installed at one end of the first hinge shaft 9, the second hinge shaft 15 is rotatably installed at one side of the seat 2, the third chain wheel 17 is installed at one end of the second hinge shaft 15, and the third chain wheel 17 is connected to the first chain wheel 14 through the third chain 13; the second chain wheel 16 is arranged at the other end of the second hinge shaft 15, the third hinge shaft 18 is arranged at one side of the seat 2 through rotating fit, the fifth chain wheel 21 is arranged at one end of the third hinge shaft 18, and the fifth chain wheel 21 is connected with the second chain wheel 16 through the first chain 10; the sixth chain wheel 22 is mounted at the other end of the third hinge shaft 18, the fourth chain wheel 19 is mounted on the fourth hinge shaft 20, and the fourth chain wheel 19 and the sixth chain wheel 22 are connected by the second chain 11.

The diameter of the first chain wheel 14 designed by the invention is smaller than that of the third chain wheel 17, and the diameters of the second chain wheel 16, the third chain wheel 17, the fourth chain wheel 19, the fifth chain wheel 21 and the sixth chain wheel 22 are equal, because the four supporting legs 3 are in a vertical state relative to the seat 2 in a normal unfolding state, and the chair back 1 is in a backward tilting state relative to the seat 2 in the normal unfolding state, when the chair is folded, the angle of swing required by the chair back 1 to swing flat relative to the seat 2 is larger than the angle of swing required by the four supporting legs 3 to swing flat relative to the seat 2, and the invention realizes the function by arranging the chain wheels with different diameters.

As shown in fig. 5, a plurality of first limit holes 28 are uniformly formed in the circumferential direction on the end surface of the lower end of the seat back 1 on the side where the transmission mechanism 5 is not installed.

As shown in fig. 5, the limiting mechanism 7 includes a limiting mounting plate 27, a limiting fixing plate 29, and a limiting rod 31, wherein one end of the limiting fixing plate 29 is circumferentially and uniformly provided with a plurality of second limiting holes 30, the other end of the limiting fixing plate 29 is fixedly mounted on the base, and after the chair back 1 swings up, the second limiting holes 30 formed in the limiting fixing plate 29 are aligned with the first limiting holes 28 formed in the chair back 1 in a one-to-one correspondence manner; a plurality of limiting rods 31 are uniformly arranged at one end of the limiting installation disc 27 in the circumferential direction, and the limiting installation disc 27 is arranged at one side of the seat 2 in a one-to-one corresponding nesting and matching mode through the limiting rods 31 and the first limiting holes 28 on the seat back 1 and the second limiting holes 30 of the limiting fixed disc.

When people normally sit on the chair seat 2, the limiting rods 31 arranged on the limiting mounting disc 27 are correspondingly inserted into the first limiting holes 28 on the chair back 1 and the second limiting holes 30 on the limiting fixing disc one by one, the limiting rods 31 limit the rotation direction of the chair back 1 and the limiting fixing disc around the axis of the first hinge shaft 9, under the condition, the chair back 1 is in a static state relative to the chair seat 2, and people can normally lean on the chair back 1.

As shown in fig. 6, the step shell 35 has a mounting groove 33 therein, two shaft holes 34 are symmetrically formed on both side end surfaces of the mounting groove 33, a mounting cavity 32 is formed on each of the inner end surfaces of the two shaft holes 34, and an outlet 36 communicated with the outside is formed on the circular surface of the mounting groove 33; the fixed rotating shaft 39 is installed in the stepping shell 35 through the two shaft holes 34, as shown in fig. 7, the stepping cloth 37 is wound on the fixed rotating shaft 39, two braces 12 are symmetrically installed at one end of the stepping cloth 37 extending out of the outlet 36, and the two braces 12 are connected with the two adjusting devices 6 in a one-to-one correspondence manner; two ends of the fixed rotating shaft 39 are positioned in the two mounting cavities 32, a volute spiral spring 38 is respectively mounted between the two ends of the fixed rotating shaft 39 and the two mounting cavities 32, the inner end of the volute spiral spring 38 is fixedly mounted on the outer circular surface of the fixed rotating shaft 39, and the outer end of the volute spiral spring 38 is fixedly mounted on the circular surface of the corresponding mounting cavity 32; the spiral spring 38 acts to restore the treading cloth 37.

As shown in fig. 8, the adjusting device 6 includes a sliding block 41, a pulling rope 42, a guide rail 43, and a movable pulley 48, wherein one end of the guide rail 43 is provided with a rope hole 45, the guide rail 43 is fixedly installed at the lower side of the seat 2, the sliding block 41 is installed in the guide rail 43 through sliding fit, the movable pulley 48 is installed on the sliding block 41, and one end of the corresponding pulling cloth is fixedly connected with the lower end face of the seat 2 by passing through the movable pulley 48; one end of the pulling rope 42 is fixedly arranged on the sliding block 41, and the other end of the pulling rope 42 passes through a rope hole 45 formed in the guide rail 43 and is fixedly connected with the automobile inner bottom plate 4.

As shown in fig. 8, in the present invention, by providing the movable pulley 48, when the sliding block 41 slides forward relative to the guide rail 43 for a certain distance, the distance that the stepping cloth 37 is pulled out is 2 times of the moving distance of the sliding block 41, so that the distance that the sliding block 41 needs to move when the stepping cloth 37 is fully spread on the rear side of the chair back 1, that is, the occupied length of the track on the chair seat 2 is reduced. When the chair back 1 is lifted upwards, the chair seat 2 moves upwards obliquely relative to the inner bottom plate 4 of the automobile, the pull rope 42 retracts, the slide block 41 moves backwards, and the stepping cloth 37 is reset under the action of the spiral spring 38.

As shown in fig. 8, two guide grooves 46 are symmetrically formed in the guide rail 43; two guide blocks 47 are symmetrically arranged on two sides of the sliding block 41, and the sliding block 41 is arranged in the guide rail 43 through the sliding fit of the two guide blocks 47 and the two guide grooves 46.

As shown in fig. 8, a fixed pulley 40 is attached to the lower side of the seatback 1, and the fixed pulley 40 guides the corresponding fabric.

A guide wheel 44 is mounted on the lower side of the seat back 1, and the guide wheel 44 guides the rope 42.

The diameter of the first chaining wheel 14 is smaller than that of the third chaining wheel 17, and the diameters of the second chaining wheel 16, the third chaining wheel 17, the fourth chaining wheel 19, the fifth chaining wheel 21 and the sixth chaining wheel 22 are equal.

The pull rope 42 is a steel wire rope; the steel wire rope is relatively firm and is not easy to break; the steel wire rope is relatively firm and is not easy to break.

The specific working process is as follows: when the folding chair designed by the invention is used, when passengers on the back row need to get on or off the vehicle, the limiting mounting disc 27 is adjusted to relieve the limitation of the chair seat 2 and the chair back 1, then the chair back 1 is manually pulled forwards, the chair back 1 drives the first hinge shaft 9 to rotate, the first hinge shaft 9 drives the first chain wheel 14 to rotate, the first chain wheel 14 drives the third chain wheel 17 to rotate through the third chain 13, the third chain wheel 17 drives the second hinge shaft 15 to rotate, the second hinge shaft 15 drives the second chain wheel 16 to rotate, the second chain wheel 16 drives the fifth chain wheel 21 to rotate through the first chain 10, the fifth chain wheel 21 drives the third hinge shaft 18 to rotate, the third hinge shaft 18 drives the sixth chain wheel 22 to rotate, the sixth chain wheel 22 drives the fourth chain wheel 19 to rotate through the second chain 11, and the fourth chain wheel 19 drives the corresponding hinge shaft 20 to rotate, the fourth hinge shaft 20 rotates to drive the corresponding supporting leg 3 to swing, the supporting leg 3 swings to drive other three supporting legs 3 to swing through the seat 2, namely the chair back 1 swings relative to the seat 2, and the four supporting legs 3 can simultaneously keep the same amplitude to swing relative to the seat 2 through the transmission mechanism 5; the folding seat is folded and laid on the inner bottom plate 4 of the automobile, a larger getting-on/off passage is provided for passengers in the back row, and smooth getting-on/off of the passengers in the back row is ensured. When the chair back 1 swings downwards relative to the chair seat 2, the chair seat 2 moves downwards obliquely relative to the automobile inner bottom plate 4, and one end of the pull rope 42 is fixed on the automobile inner bottom plate 4, so that when the chair seat 2 moves downwards obliquely relative to the automobile inner bottom plate 4, the slide block 41 slides forwards relative to the guide rail 43 under the action of the pull rope 42, the slide block 41 slides to drive the movable pulley 48 to slide, the movable pulley 48 slides to drive the corresponding pull cloth to be pulled forwards, the pull cloth drives the stepping cloth 37 wound in the stepping shell 35 to be pulled outwards, and the stepping cloth 37 is laid on the rear side surface of the chair back 1 and serves as a stepping pad; the rear side of the seat back 1 is prevented from being adhered with dirt if a passenger steps on the folded seat carelessly when getting on or off the vehicle, and when the passenger sits down in the rear row and the seat is in an unfolded state, clothes are possibly dirtied due to the fact that the dirt on the seat back 1 is not noticed.