CN218127658U - Prevent bracket folding mechanism of tong - Google Patents

Abstract

The utility model discloses a foot-rest folding mechanism for preventing hands from being clamped, which comprises a base, a foot stool connecting piece and a foot stool connecting rod assembly; the base is of a frame structure and is configured as a main body support of the mechanism, the footrest connecting piece is used for mounting a footrest part of the seat, and the footrest connecting rod assembly comprises two groups of connecting rod sets; each connecting rod group comprises two footstool connecting rods, and in the same connecting rod group, at least one footstool connecting rod comprises a shielding part which is integrally formed with the footstool connecting rod; the two foot stool connecting rods of the same connecting rod group are overlapped in a staggered mode when the foot stool connecting pieces are folded, and the shielding parts are always overlapped with the other foot stool connecting rod in a staggered mode when the foot stool connecting pieces are switched from the folded state to the extended state; compared with the prior art, the shielding part and the connecting rod are integrally formed, in other words, the width of the connecting rod is used for preventing the hands from being clamped, so that no gap exists between the two connecting rods all the time, and the hand clamping condition does not occur; the problem of bracket folding mechanism tong has been solved very ingenious simply.

Description

Prevent bracket folding mechanism of tong

Technical Field

The utility model relates to the field of furniture, in particular to prevent tong bracket folding mechanism.

Background

Nowadays, more and more seats with a leg rest function are provided, and certainly, sofa seats with high comfort are not pursued, such seats often have a mechanical extension device installed inside to control the movement of each part of the seat, wherein the mechanism for controlling the leg rest pillow is the leg rest folding mechanism positioned in the front part of the mechanical extension device, the mechanism generally comprises a plurality of connecting rods, and the different connecting rods are connected in multiple points, so that the connecting rods are limited to perform ideal movement, and the mechanism can be extended and folded to control the leg rest pillow to extend to support a user's leg or fold the cushion.

However, because the number of the connecting rods of the driving leg rest folding mechanism is large, when the leg rest folding mechanism works, a gap between two adjacent connecting rods is changed frequently, and the connecting rod and the footrest connecting piece for installing the leg rest pillow cannot rotate relatively, so that the risk of clamping hands exists between the connecting rods and between the leg rest pillow and the connecting rod, and especially, a child with a short height cannot stretch hands to the leg rest folding mechanism to avoid clamping hands.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a pinch-proof footrest folding mechanism, at least one shielding part is arranged on the connecting rod of each connecting rod group, and the gap which can be originally formed between the two connecting rods is shielded by the shielding part; the shielding part and the connecting rod are integrally formed, in other words, the width of the connecting rod is realized, and the hand clamping is prevented without arranging redundant parts to shield the gap.

The technical scheme of the utility model is realized like this:

a pinch resistant leg rest fold out mechanism comprising:

a base, which is a frame structure and is configured as a main body support of the mechanism;

the footrest connecting piece is used for installing a footrest part of the seat;

the footrest connecting rod assembly is arranged on the base, is connected with the footrest connecting rod assembly and is configured to drive the footrest connecting piece to fold or extend;

the footrest connecting rod assembly comprises two groups of connecting rod groups; each connecting rod group comprises two footstool connecting rods, and in the same connecting rod group, at least one footstool connecting rod comprises a shielding part integrally formed with the footstool connecting rod; the two foot stool connecting rods of the same connecting rod group are overlapped in a staggered mode when the foot stool connecting pieces are folded, and the shielding parts are always overlapped with the other foot stool connecting rod in a staggered mode when the foot stool connecting pieces are switched from the folded state to the extended state.

In the leg rest folding mechanism, the connecting rods usually work in pairs, and when the leg rest folding mechanism is extended, at least two pairs of connecting rods, namely two groups of connecting rods, are arranged in the front-back direction; generally, the gap between two connecting rods of a group of connecting rods can change along with the stretching and folding movement; however, in this mechanism, a gap that would otherwise occur between the two links is blocked by the blocking portion; the shielding part and the connecting rods are integrally formed, in other words, the width of the connecting rods is used for preventing hands from being clamped, namely, the gap between the two connecting rods does not exist all the time through the matching of the distance between the two connecting rods in the same connecting rod group and the width of the two connecting rods, and the condition of clamping the hands does not exist; the problem of bracket folding mechanism tong has been solved very ingenious simply.

The staggered overlapping is different from the complete overlapping, in the leg rest folding mechanism, two links of one group of link groups are actually in an inner-outer relationship, namely in the width direction of the mechanism, one link is an inner link close to the base, the other link is an outer link far away from the base, and the staggered overlapping means that the two links have overlapped parts and simultaneously have respective exposed parts when viewed from the side, but no gap exists between the two.

Preferably, the footrest link assembly comprises a first footrest link rod, a second footrest link rod, a third footrest link rod, a fourth footrest link rod and a fifth footrest link rod, the two link groups are a swing link group and a driven link group, the swing link group comprises the first footrest link rod and the second footrest link rod, the upper ends of the first footrest link rod and the second footrest link rod are both rotatably connected with the base, the driven link group comprises the third footrest link rod and the fourth footrest link rod, the upper ends of the third footrest link rod and the fourth footrest link rod are both rotatably connected with the fifth footrest link rod, the lower end of the first footrest link rod is rotatably connected with the lower end of the third footrest link rod, the lower end of the second footrest link rod is rotatably connected with the lower end of the fourth footrest link rod, and the third footrest link rod is also rotatably connected with the second footrest link rod; the footrest connecting piece is rotationally connected with the fifth footrest connecting rod.

Preferably, the first footrest connecting rod comprises a first shielding portion protruding forwards, the second footrest connecting rod comprises a second shielding portion protruding backwards, the first footrest connecting rod and the second footrest connecting rod are arranged in a staggered and overlapped mode in the folded state of the footrest connecting piece, and the first shielding portion and the second shielding portion are always overlapped in a staggered mode when the footrest connecting piece is switched from the folded state to the extended state. Under the stretching state, the distance between the first footrest connecting rod and the second footrest connecting rod is the largest, and due to the existence of the first shielding part and the second shielding part, the first footrest connecting rod and the second footrest connecting rod are still in the staggered state, no gap exists between the first footrest connecting rod and the second footrest connecting rod, and no clamping hand is generated.

Preferably, the distance between the rotating point of the first footrest connecting rod and the base and the rotating point of the second footrest connecting rod and the base is less than the sum of the widths of the first footrest connecting rod and the second footrest connecting rod; the distance between the rotating point of the third footrest connecting rod and the first footrest connecting rod and the distance between the rotating point of the third footrest connecting rod and the second footrest connecting rod are smaller than the sum of the widths of the first footrest connecting rod and the second footrest connecting rod. The relationship between the distance between the first footrest connecting rod and the second footrest and the sum of the widths of the first footrest connecting rod and the second footrest connecting rod is directly described, so that the first footrest connecting rod and the second footrest connecting rod can not have the gap of clamping hands in any state.

Preferably, the third footrest connecting rod includes a third shielding portion protruding forward, the third footrest connecting rod and the fourth footrest connecting rod are overlapped in a staggered manner in a folded state of the footrest connecting member, and the third shielding portion and the fourth footrest connecting rod are always overlapped in a staggered manner when the footrest connecting member is switched from the folded state to an extended state. Under the stretching state, the distance between the third footrest connecting rod and the fourth footrest connecting rod is the largest, and due to the existence of the third shielding part, the third footrest connecting rod and the fourth footrest connecting rod are still in the staggered state, no gap exists between the third footrest connecting rod and the fourth footrest connecting rod, and no hand clamping condition occurs.

Preferably, a distance between a rotation point of the third footrest link and the fifth footrest link and a rotation point of the fourth footrest link and the fifth footrest link is less than a sum of widths of the third footrest link and the fourth footrest link; the distance between the rotating point of the third footrest connecting rod and the second footrest connecting rod and the distance between the rotating point of the fourth footrest connecting rod and the second footrest connecting rod are smaller than the sum of the widths of the third footrest connecting rod and the fourth footrest connecting rod. The relationship between the distance between the third footrest link and the fourth footrest and the sum of the widths of the third footrest link and the fourth footrest link is directly described, so that the third footrest link and the fourth footrest link do not have a gap for clamping hands in any state.

Preferably, the fifth footrest connecting rod is provided with a second spring fixing column, when the footrest connecting piece is switched from the folded state to the extended state, the footrest connecting rod assembly is extended, and the second spring fixing column jacks up the footrest connecting piece. Because the footrest connecting piece rotates and sets up on fifth footrest connecting rod, so need lift the footrest connecting piece by second spring fixed column, just can make the bracket portion upset of thing to the level.

Preferably, a third spring fixing column is arranged on the footrest connecting piece, and a footrest return spring is arranged between the second spring fixing column and the third spring fixing column. This bracket return spring can withdraw the ottoman connecting piece when switching to folded state by the extension state, can also make the ottoman connecting piece have elasticity, prevents that the condition of tong from appearing between ottoman connecting piece and fifth ottoman connecting rod in the user.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

1. the leg rest folding mechanism has a more comprehensive anti-pinch design; in the whole footstool connecting rod assembly, no gap is generated between two connecting rods in all connecting rod groups in the moving process; in this mechanism, a gap that would otherwise occur between the two links is shielded by the shielding portion; the shielding part and the connecting rods are integrally formed, in other words, the width of the connecting rods is used for preventing hands from being clamped, namely, the gap between the two connecting rods does not exist all the time through the matching of the distance between the two connecting rods in the same connecting rod group and the width of the two connecting rods, and the condition of clamping the hands does not exist; the problem of clamping the hand of the leg rest folding mechanism is solved skillfully and simply; in addition, the footrest connecting piece is flexibly connected to the footrest connecting rod assembly, and compared with rigid connection, when an obstacle appears between the footrest connecting rod assembly and the footrest connecting piece by the method, the footrest connecting piece has certain avoiding capacity, so that the hand clamping is prevented.

2. Compare with other bracket folding mechanism who prevents tong, this mechanism is because the interval of two connecting rods in every group connecting rod group is little, so can realize the stack of multilayer connecting rod after drawing in, and occupation space is little, does not influence arranging of rear connecting rod.

Drawings

Fig. 1 is a first schematic perspective view of a seat in a normal sitting state according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a seat in a normal sitting state according to an embodiment of the present invention;

fig. 3 is a schematic perspective view of a mechanical stretching device in a normal sitting state according to an embodiment of the present invention;

fig. 4 is a schematic perspective view of a mechanical stretching device in a normal sitting state according to an embodiment of the present invention;

FIG. 5 is a schematic perspective view of the seat, backrest and mechanical stretching device of the present invention;

fig. 6 is a side view of the mechanical extension unit in a normal sitting position according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of the seat in the standing assisting state according to the embodiment of the present invention;

fig. 8 is a schematic perspective view of the mechanical stretching device in the auxiliary standing state according to the embodiment of the present invention;

fig. 9 is a side view of the mechanical extension unit in an assisted standing position of the present invention in an embodiment;

fig. 10 is a schematic perspective view of the connection between the transmission link and the square tube according to the embodiment of the present invention;

fig. 11 is a side view of a four bar linkage of the seat link motion in an embodiment of the invention;

FIG. 12 is a schematic view of the movement of the seat link movement four-bar linkage of FIG. 11;

fig. 13 is a side view of a four bar linkage mechanism for driving the seat portion linkage movement in an embodiment of the present invention;

FIG. 14 is a schematic view of the movement of the four-bar linkage of FIG. 13 for driving the movement of the seat links;

fig. 15 is a schematic perspective view of the seat in an extended footrest state according to the embodiment of the present invention;

fig. 16 is a schematic perspective view of the mechanical stretching device in the state of extending the footrest according to the embodiment of the present invention;

fig. 17 is a side view of the mechanical extension unit in an extended footrest state of the present invention;

fig. 18 is a side view of a linkage mechanism for movement of a first footrest link in an embodiment of the present invention;

FIG. 19 is a schematic illustration of the movement of the linkage mechanism of the first footrest link of FIG. 18;

fig. 20 is a schematic perspective view of the seat in the lying state according to the embodiment of the present invention;

fig. 21 is a schematic perspective view of the mechanical stretching device in the lying state according to the embodiment of the present invention;

fig. 22 is a side view of the mechanical stretching unit of the present invention in the lying state;

fig. 23 is a side view of a four bar linkage driving movement of the backrest connector in an embodiment of the present invention;

FIG. 24 is a schematic view of the movement of the four bar linkage driving movement of the backrest connector of FIG. 23;

fig. 25 is a side view of a four bar linkage of the movement of the back links in an embodiment of the invention;

FIG. 26 is a schematic view of the movement of the four bar linkage of FIG. 25 with the backrest connection moved;

fig. 27 is a schematic view of the seat in the normal sitting state according to the embodiment of the present invention;

fig. 28 is a schematic view of the seat in the standing-assisting state according to the embodiment of the present invention;

fig. 29 is a schematic view of the seat in an extended footrest state according to the embodiment of the present invention;

fig. 30 is a schematic view illustrating a state of the seat in a lying state according to the embodiment of the present invention;

fig. 31 is an exploded view of a footrest link assembly in an embodiment of the present invention;

FIG. 32 is a schematic view showing the distance between the first and second footrest links and the sum of their widths in accordance with the embodiment of the present invention;

fig. 33 is a schematic diagram showing the distance between the third and fourth footrest links and the total width of the third and fourth footrest links in accordance with the present invention.

The figures are numbered: a backrest 1; a seat 2; an armrest 3; a mechanical stretching device 4; a base 5; a mechanical extension unit 4a; an actuator 6; a transmission link 7; a connection end 7a; a rotary shaft end 7b; a jacking end 7c; a first transmission point 7d; a second transmission point 7e; a backrest connection member 8; a seat attachment 9; a footrest connector 10; a square tube 11; a seat link 12; a jack 13; a first push-pull rod 14; a lifting link 15; a footrest push-pull rod 16; a first footrest link 17; the first shielding portion 17a; a second footrest link 18; the second shielding portion 18a; a third ottoman link 19; the third shielding portion 19a; a fourth footrest link 20; a fifth footrest link 21; a second push-pull rod 22; a first backrest link 23; a second backrest link 24; a driven link 25; a seat return spring 26; a first spring fixing post 27; a coupling lug 28; a support plate 29; a position limiting plate 30; the first seat mounting plate 31; a second seat mounting plate 32; a welcome board 33; a second spring fixing post 34; a third spring fixing post 35; leg rest return spring 36.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model discloses a specific embodiment as follows:

as shown in fig. 4, 17, and 31, the present invention provides a hand-clipping prevention leg rest folding mechanism, which includes a base, a leg rest connecting member 10 and a leg rest connecting rod assembly, wherein the base 5 is a frame structure and is configured as a main body support of the mechanism, the leg rest connecting member is used for installing a leg rest portion (not shown) of a seat, the leg rest connecting rod assembly is disposed on the base 5, the leg rest connecting member 10 is connected with the leg rest connecting rod assembly, and the leg rest connecting rod assembly is configured to drive the leg rest connecting member 10 to fold or extend; the footrest connecting rod assembly comprises two groups of connecting rods, each group of connecting rods comprises two footrest connecting rods, and in the same group of connecting rods, at least one footrest connecting rod comprises a shielding part integrally formed with the footrest connecting rod; the two foot stool connecting rods of the same connecting rod group are overlapped in a staggered mode when the foot stool connecting pieces are folded, and the shielding portions are always overlapped with the other foot stool connecting rod in a staggered mode when the foot stool connecting pieces are switched from the folded state to the extended state.

In the leg rest folding mechanism, the connecting rods usually work in pairs, and when the leg rest folding mechanism is extended, at least two pairs of connecting rods, namely two groups of connecting rods, are arranged in the front-back direction; generally, the gap between two connecting rods of a group of connecting rods can change along with the stretching and folding movement; however, in this mechanism, a gap that would otherwise occur between the two links is blocked by the blocking portion; the shielding part and the connecting rods are integrally formed, in other words, the width of the connecting rods is used for preventing hands from being clamped, namely, the gap between the two connecting rods does not exist all the time through the matching of the distance between the two connecting rods in the same group of connecting rod groups and the width of the two connecting rods, and the condition of clamping hands does not exist; the problem of bracket folding mechanism tong has been solved very ingenious simply.

The staggered overlapping is different from the complete overlapping, which can be understood as partial overlapping, in the leg rest folding mechanism, two links of one group of links are actually in an inner-outer relationship, that is, in the width direction of the mechanism, one link is an inner link close to the base 5, and the other link is an outer link far from the base 5, and the staggered overlapping means that the two links have overlapped parts when viewed from the side, and simultaneously, the two exposed parts are also provided, but no gap exists between the two.

Specifically, as shown in fig. 3 and 4, the leg rest folding mechanism is part of a mechanical extension device, and includes the base 5, the actuator 6, the leg rest extension mechanism, the backrest reclining mechanism, a transmission member (not numbered), and the seat link 9. The shoe attachment 9 is provided on the base 5 by a shoe overturning moving mechanism.

The mechanical stretching device is installed in a piece of seating furniture shown in fig. 1 and 2, the seating furniture comprises a backrest 1, a seat 2, a foot rest, two armrests 3 positioned at the left and right sides of the backrest 1 and the seat 2, and the mechanical stretching device 4 suspended between the two armrests 3; the backrest 1 is configured to support the back of a human body, the seat 2 is configured to support the buttocks of the human body, the footrest is configured to be folded under the seat 2 when the footrest is contracted, and to support the legs of the human body when the footrest is expanded, and the armrest 3 is configured to support the arms of the human body.

As shown in fig. 2-6, the movement of the mechanical extension device is mainly realized by the movement of the mechanical extension unit 4a arranged on the two sides of the base 5 in a mirror image manner, and the actuator 6 is used for driving the mechanical extension unit 4a to move, the actuator 6 is an electric push rod, and the mechanical extension unit 4a comprises: a drive link 7, a backrest link 8, a seat link 9 and said footrest link 10; the left side and the right side of the base 5 are fixedly connected with the two handrails 3; the actuator 6 is hinged with the base 5 and acts on the transmission connecting rod 7 through a square tube 11 which is transversely arranged, one end of the actuator 6 provided with a motor is hinged with the base 5, and the end part of a telescopic rod of the actuator 6 is rotationally connected with the square tube 11; the transmission connecting rod 7 is rotationally connected with the base 5; the backrest connecting piece 8 is inserted into the backrest 1 and fixedly connected through a screw, and the backrest connecting piece 8 is in transmission connection with the transmission connecting rod 7 through the backrest 1 connecting rod assembly; the footrest connecting piece 10 is fixedly connected with the footrest part through a screw, and the footrest connecting piece 10 is in transmission connection with the transmission connecting rod 7 through the footrest connecting rod assembly; the seat connecting piece 9 is fixedly connected with the seat 2 through a screw, the seat connecting piece 9 is rotatably connected to a seat connecting rod 12, and the footrest connecting rod assembly is relatively rotatably arranged with the base 5 through the seat connecting rod 12.

As shown in fig. 4-9, a cylindrical jacking member 13 is disposed on the transmission link 7, and the jacking member 13 is located at the front side of the rotation connection point of the transmission link 7 and the base 5 and is located at the rear lower part of the connection point of the seat connecting member 9 and the seat link 12; the seat comprises four states of auxiliary standing, normal sitting, leg rest stretching and lying; all four states are regulated and controlled by the actuator 6; when the normal sitting is switched to the auxiliary standing, the actuator 6 extends forwards and drives the transmission connecting rod 7 to swing forwards and upwards, the jacking piece 13 jacks up the seat connecting piece 9, the rear part of the seat connecting piece 9 swings upwards, and the seat 2 is driven to swing synchronously; when the seat is in the standing-assisting state, the rear part of the seat part 2 is hollowed.

In this embodiment, since the base 5 is fixedly connected between the two armrests 3, the base 5 is always fixed, and all the rods rotatably connected to the base 5 can only rotate but cannot move, and because of the limitation formed by the connection between the rods, the rotation angle of the rods rotatably connected to the base 5 cannot reach 360 °, and it can also be said that the rods rotatably connected to the base 5 can only swing. Because the transmission connecting rod 7 is rotationally connected with the base 5, the movement directions are only two, the transmission connecting rod 7 rotates upwards or the transmission connecting rod 7 rotates forwards, namely the transmission connecting rod 7 rotates upwards forwards, the transmission connecting rod 7 rotates backwards or the transmission connecting rod 7 rotates downwards, namely the transmission connecting rod 7 rotates downwards backwards, and other rod pieces rotationally connected with the base 5 are similar.

Specifically, as shown in fig. 3 and 4, the mechanical extension unit 4a further includes a first push-pull rod 14, a lift link 15, a footrest push-pull rod 16, a first footrest link 17, a second footrest link 18, a third footrest link 19, a fourth footrest link 20, a fifth footrest link 21, a second push-pull rod 22, a first back link 23, a second back link 24, and a follower link 25.

As shown in fig. 3, 6 and 10, the left and right ends of the square tube 11 are fixedly connected with the transmission connecting rods 7 on the left and right sides, the transmission connecting rods 7 are triangular plate-shaped members, and include a connecting end 7a connected with the square tube 11, a rotating shaft end 7b rotatably connected with the base 5, and a jacking end 7c provided with a jacking piece 13, the jacking end 7c is located in front of the rotating shaft end 7b and the connecting end 7a, the jacking piece 13 is mounted on the jacking end 7c through screws, and the connecting end 7a is located below the rotating shaft end 7b and the jacking end 7c; a first transmission point 7d and a second transmission point 7e are arranged between the rotating shaft end 7b and the jacking end 7c, the first push-pull rod 14 is rotatably connected to the first transmission point 7d, the first push-pull rod 14 is used for lifting the seat connecting rod 12, the second push-pull rod 22 is rotatably connected to the second transmission point 7e, and the second push-pull rod 22 is used for driving the backrest connecting piece 8 to move; when the seat is switched from a normal sitting state to an auxiliary standing state, the transmission connecting rod 7 drives the first push-pull rod 14 and the second push-pull rod 22 to move forwards, the first push-pull rod 14 drives the seat connecting rod 12 to move forwards downwards and then drives the seat connecting rod 12 to return to the original position, and the second push-pull rod 22 drives the backrest connecting piece 8 and the backrest 1 to tilt forwards; when the seat is switched from the normal sitting state to the extended leg rest state or the lying state, the actuator 6 retracts to drive the transmission connecting rod 7 to rotate downwards and backwards, the transmission connecting rod 7 drives the first push-pull rod 14 and the second push-pull rod 22 to move backwards, the first push-pull rod 14 lifts the seat connecting rod 12 upwards and backwards, and the second push-pull rod 22 drives the backrest connecting piece 8 and the backrest 1 to lean backwards.

Describing the movement of the seat part 2, under the normal sitting state, the stretching and leg-resting state and the lying state, the seat part 2 and the seat part connecting piece 9 are synchronous with the seat part connecting rod 12, and the seat part connecting piece 9 and the seat part 2 are supported by the seat part connecting rod 12; in the auxiliary standing state, as shown in fig. 8, 9 and 28, the rear part of the seat connecting part 9 is separated from the rear part of the seat connecting rod 12, an included angle is formed between the two parts, and the seat 2 can be inclined forwards to form an included angle of 28 degrees with the horizontal plane; the rotation tie point of seat connecting piece 9 and seat connecting rod 12 is located the preceding tip of seat connecting piece 9 and the preceding tip of seat connecting rod 12, and the mechanical stretching device 4 of current supplementary function of standing is whole lifting almost in order to realize this function, can push away the top forward with human focus, and the utility model discloses in, the rotation point of seat 2 is close to human knee joint, and the human buttock of lifting makes the knee joint rotate and stands with the auxiliary user, more accords with ergonomic.

A seat return spring 26 is arranged between the seat connecting piece 9 and the seat connecting rod 12, the seat return spring 26 is configured to give downward rotating force to the rear part of the seat connecting piece 9, a first spring fixing column 27 is arranged below the rotating connection point of the seat connecting rod 12 and the seat connecting rod 9, a connecting lug 28 with a hole extends downwards below the oblique rear part of the rotating connection point of the seat connecting piece 9 and the seat connecting rod 12, one end of the seat return spring 26 is arranged on the first spring fixing column 27, and the other end of the seat return spring is arranged on the connecting lug 28; the seat connecting rod 12 is arranged at the outer side of the seat connecting piece 9, a bearing plate 29 extends inwards from the position, close to the rear end, of the seat connecting rod 12, a limiting plate 30 correspondingly extends outwards from the corresponding position of the seat connecting piece 9, when the seat is in the standing assisting state, the limiting plate 30 is separated from the bearing plate 29, and in the normal sitting, extending and lying states, the limiting plate 30 is abutted against the bearing plate 29 under the action of the seat return spring 26.

Fix with the screw on the seat connecting piece 9 and be equipped with first seat mounting panel 31 and the second seat mounting panel 32 that are used for mount pad 2, first seat mounting panel 31 all faces the inboard of mechanical extension device 4 with second seat mounting panel 32, and first seat mounting panel 31 is located the front side of second seat mounting panel 32, bends downwards at first seat mounting panel 31 rear portion and forms and be used for catering to the meeting board 33 of jacking piece 13, jacking piece 13 is located catering to board 33's below and jacking piece 13 is equally towards the inboard of mechanical extension device 4, when the seat is switched to supplementary standing by normal just sitting, jacking piece 13 upwards jacks up meeting board 33 and drives seat connecting piece 9 rear portion luffing upwards.

The rear end of the lifting connecting rod 15 is rotatably connected with the base 5, the front end of the lifting connecting rod 15 is rotatably connected with the seat connecting rod 12, the rear end of the first push-pull rod 14 is rotatably connected with the transmission connecting rod 7, and the front end of the first push-pull rod 14 is rotatably connected with the lifting connecting rod 15; when the transmission connecting rod 7 is driven by the actuator 6 to rotate backwards, the first push-pull rod 14 is driven to move backwards, the first push-pull rod 14 pulls the lifting connecting rod 15 backwards, the front end of the lifting connecting rod 15 rotates upwards and backwards, and the seat connecting rod 12 is lifted upwards and backwards; the seat link 12 is pivotally connected at a rear end thereof to an upper end of the driven link 25, the driven link 25 is pivotally connected at a lower end thereof to the base 5, and the driven link 25 is configured to support the seat link 12 and to maintain the seat 2 substantially horizontal, so that the seat link 12 can be switched between different states and maintained substantially horizontal due to the presence of the driven link 25.

In a normal sitting state and a lying state, an included angle of 8 degrees is formed between the seat part 2 and a horizontal plane, in an extended footrest state, the seat part 2 is also inclined backwards, and the backward inclination angle between the seat part 2 and the horizontal plane is 9.5 degrees so as to improve the sitting comfort, and the change of the backward inclination angle of the seat part 2 is generated along with the movement of a four-bar mechanism where the seat part connecting rod 12 is positioned; in the movement of the seat link 12, the base 5, the driven link 25, the seat link 12 and the lifting link 15 form a double-rocker four-bar linkage, and in the movement of driving the seat link 12, the base 5, the transmission link 7, the first push-pull rod 14 and the lifting link 15 form a double-rocker four-bar linkage, and the specific configurations of the lengths and the like of the two four-bar linkages are not described too much in the embodiment, and the final effect is shown in fig. 11-14:

in the process of switching the normal sitting state to the auxiliary standing state, the actuator 6 extends forwards to enable the transmission connecting rod 7 to rotate forwards, the transmission connecting rod 7 drives the first push-pull rod 14 to push the lifting connecting rod 15 forwards firstly, the lifting connecting rod 15 rotates downwards and drives the seat connecting rod 12 to move forwards and downwards, and then the lifting connecting rod 15 is pulled upwards backwards to enable the lifting connecting rod 15 to rotate upwards and drive the seat connecting rod 12 to return to the original position; when the auxiliary standing state is switched back to the normal sitting state, the motion process of each connecting rod is opposite to the process; when the normal sitting state is switched to the extended footrest state, the actuator 6 retracts backwards to enable the transmission connecting rod 7 to rotate backwards, the transmission connecting rod 7 drives the first push-pull rod 14 to move downwards and backwards, the first push-pull rod 14 pulls the lifting connecting rod 15 to rotate backwards, the seat connecting rod 12 is lifted by the lifting connecting rod 15 and accompanied by backward tilting, but when the actuator 6 retracts backwards to enable the extended footrest state to be switched to the lying state, the seat connecting rod 12 is lifted to the highest degree and the backward tilting angle of the seat 2 and the horizontal plane returns to 8 degrees.

Describing the movement of the footrest part, as shown in fig. 15-17, the footrest link assembly includes a first footrest link 17, a second footrest link 18, a third footrest link 19, a fourth footrest link 20, and a fifth footrest link 21, wherein the upper end of the first footrest link 17 and the upper end of the second footrest link 18 are rotatably connected to the seat link 12, and a rotational connection point of the first footrest link 17 and the seat link 12 is located below a rotational connection point of the second footrest link 18 and the seat link 12, the lower end of the third footrest link 19 is rotatably connected to the first footrest link 17, the third footrest link 19 is rotatably connected to the second footrest link 18 near an upper portion of the rotational connection point of the third footrest link 17 and the first footrest link 17, the lower end of the second footrest link 18 is rotatably connected to the lower end of the fourth footrest link 20, the front end of the fifth footrest link 21 is rotatably connected to the rear end of the footrest link 10, the upper end of the third footrest link 19 is rotatably connected to the rear end of the fifth footrest link 21, and the middle portion of the fourth footrest link 21 is connected to the fifth footrest link 21; a second spring fixing column 34 is arranged on the fifth footstool connecting rod 21, the second spring fixing column 34 is positioned below the footstool connecting piece 10, a third spring fixing column 35 is arranged in the middle of the footstool connecting piece 10, and a footrest return spring 36 is arranged between the second spring fixing column 34 and the third spring fixing column 35; two ends of the footrest push-pull rod 16 are respectively and rotatably connected to the front end of the base 5 and the first footrest connecting rod 17; extension and retraction of the leg rest is primarily driven by the seat link 12, but must be achieved by the driven engagement of the footrest push-pull rod 16.

As shown in fig. 31 to 33, the two link assemblies of the footrest link assembly are a swing link assembly and a driven link assembly, the swing link assembly includes the first footrest link 17 and the second footrest link 18, and the driven link assembly includes the third footrest link 19 and the fourth footrest link 20; the first ottoman link 17 includes a first shielding portion 17a projecting forward, the second ottoman link 18 includes a second shielding portion 18a projecting rearward, and the third ottoman link 19 includes a third shielding portion 19a projecting forward; when the footrest connecting piece 10 is switched from the folded state to the extended state, the first shielding portion 17a and the second shielding portion 18a are always overlapped in a staggered manner, and the third shielding portion 19a and the fourth footrest connecting rod 20 are also always overlapped in a staggered manner; in the extended state, the distance between the first footrest connecting rod 17 and the second footrest connecting rod 18 is the largest, and due to the existence of the first shielding portion 17a and the second shielding portion 18a, the first footrest connecting rod 17 and the second footrest connecting rod 18 are still in the staggered state, and no gap exists between the two, so that no clamping phenomenon occurs; similarly, due to the existence of the third shielding portion 19a, the third footrest connecting rod 19 and the fourth footrest connecting rod 20 are always in a staggered state, no gap exists between the third and fourth footrest connecting rods, and the situation of clamping hands does not occur; therefore, both linkages of the footrest link assembly will prevent pinching, which is not possible with typical mechanical stretching devices.

Further, besides the width of the connecting rods is increased by the shielding parts, the distance between the connecting rods also needs to be designed: the distance between the rotation point of the first footrest link 17 and the base 5 and the rotation point of the second footrest link 18 and the base 5 is less than the sum of the widths of the first and second footrest links; the distance between the rotating point of the third footrest connecting rod 19 and the first footrest connecting rod 17 and the rotating point of the third footrest connecting rod 19 and the second footrest connecting rod 18 is smaller than the sum of the widths of the first footrest connecting rod and the second footrest connecting rod, so that the first footrest connecting rod, the second footrest connecting rod, part of the third footrest connecting rod 19 and part of the base 5 form a quadrilateral mechanism, the closer the first footrest connecting rod and the second footrest connecting rod are to being parallel, the closer the distance between the first footrest connecting rod and the second footrest connecting rod is to the distance between the rotating points, the larger the distance between the first footrest connecting rod and the second footrest connecting rod is, but the sum of the widths of the first footrest connecting rod and the second footrest connecting rod is always larger than the distance between the rotating points, therefore, the distance between the first footrest connecting rod and the second footrest connecting rod is smaller, and the sum of the widths of the first footrest connecting rod and the second footrest connecting rod is larger, and no gap can be formed between the first footrest connecting rod and the second footrest connecting rod from beginning to end; similarly, the distance between the rotation point of the third footrest link 19 and the fifth footrest link 21 and the rotation point of the fourth footrest link 20 and the fifth footrest link 21 is less than the sum of the widths of the third and fourth footrest links; the distance between the turning point of the third footrest link 19 and the second footrest link 18 and the turning point of the fourth footrest link 20 and the second footrest link 18 is less than the sum of the widths of the third and fourth footrest links, and no gap will occur between the third and fourth footrest links. Meanwhile, the distance between the rotating points of the two connecting rods of each connecting rod group is small, so that the space occupied by the foot stool connecting rod assembly after contraction is smaller, and the arrangement of the connecting rods at the rear part cannot be influenced.

The footrest link assembly and the footrest link assembly 10 move together with the movement of the seat link 12, and when the normal sitting state is switched to the standing-assisting state, the seat link 12 and the footrest link assembly move forward and downward first, and the movement distance is short, the footrest push-pull rod 16 has little influence on the footrest link assembly, and then the seat link 12 and the footrest link assembly return to the original positions, and the footrest link assembly is hardly moved by the footrest push-pull rod 16 in the entire process.

When the sitting state is switched to the extended footrest state, the actuator 6 retracts to drive the transmission connecting rod 7 to rotate backwards, the transmission connecting rod 7 drives the first push-pull rod 14 to move backwards, the first push-pull rod 14 pulls the lifting connecting rod 15 backwards, the front end of the lifting connecting rod 15 rotates upwards and backwards, the seat connecting rod 12 and the footrest connecting rod assembly are lifted upwards and backwards, the front end of the footrest push-pull rod 16 rotates upwards along with the first push-pull rod and pushes the footrest connecting rod assembly to extend forwards, the second spring fixing column 34 of the fifth footrest connecting rod 21 jacks up the footrest connecting piece 10 and turns the same upwards, and the footrest part also turns over along with the second spring fixing column 34; when the state is switched back to the normal sitting state from the extended footrest state, the movement process of each connecting rod is opposite to that of the connecting rods, and the footrest return spring 36 enables the footrest connecting piece 10 to turn downwards and retract along with the movement of the fifth footrest connecting rod 21; the role of the footrest push-pull rod 16 on the footrest link assembly is passive rather than active; the footrest return spring 36 not only acts on the footrest connector 10 to return it, but also makes the footrest connector 10 elastically and rotatably connected to the fifth footrest link 21, and when there is an obstacle between the footrest connector 10 and the fifth footrest link 21, the footrest connector 10 has a certain avoiding capability, thereby preventing hand pinching.

During this movement, it is also achieved by a set of linkage mechanisms, as shown in fig. 18 and 19, which includes the fixed base 5, the seat link 12 that can only translate, the lifting link 15 that can only rotate, the footrest push-pull rod 16 that can only rotate, and the first footrest link 17 that can translate and rotate, the above five-link mechanism enables the movement of the whole mechanism to be determined because the seat link 12 can only translate, when the lifting link 15 drives the seat link 12 to translate backwards, under the restriction of the footrest push-pull rod 16, the first footrest link 17 rotates forward while translating with the seat link 12, so that the whole footrest link assembly is extended and opened; the seat link 12 tilts during the sitting of the seat but at a smaller angle, and the "seat link capable of only translating" in the above analysis is theoretically speaking.

The footrest connecting piece 10 is rotatably connected with the fifth footrest connecting rod 21, is movable relative to the footrest connecting rod assembly, and is matched with the elasticity of the footrest return spring 36 to ensure that the footrest part of the seat has the function of preventing hands from being clamped.

Finally, the movement of the backrest 1 will be described, as shown in fig. 20 to 26, the backrest 1 link assembly includes a second push-pull rod 22, a first backrest link 23 and a second backrest link 24, the front end of the second push-pull rod 22 is rotatably connected to the transmission link 7, the rear end of the second push-pull rod 22 is rotatably connected to the first backrest link 23, the first backrest link 23 is substantially L-shaped, and its corners are rotatably connected to the base 5, the rear end of the first backrest link 23 is rotatably connected to the front end of the backrest link 8, the backrest link 8 is also L-shaped, the corners of the backrest link 8 are rotatably connected to the upper end of the second backrest link 24, the upper portion of the backrest link 8 is inserted into the backrest 1 and fixed by screws, the lower end of the second backrest link 24 is rotatably connected to the base 5, and the first backrest link 23 is located in front of the second backrest link 24.

The base 5, the first backrest link 23, the second backrest link 24 and the backrest link 8 form a four-bar linkage of a double rocker in the movement of the backrest link 8, and the base 5, the transmission link 7, the second push-pull rod 22 and the first backrest link 23 form a four-bar linkage of a double rocker in the movement of driving the movement of the backrest link 8; in the four-bar linkage mechanism for driving the backrest connecting member 8 to move, the transmission link 7 is driven by the actuator 6 to rotate relative to the base 5, and the second push-pull rod 22 is driven by the transmission link 7 to push the first backrest link 23 to rotate downwards relative to the base 5 or pull the first backrest link 23 to rotate upwards relative to the base 5; in the movement of the backrest connecting part 8, the movement of the first backrest connecting rod 23 causes the movement of the backrest connecting part 8, the first backrest connecting rod 23 rotates relative to the base 5 to drive the backrest connecting part 8 to move, the second backrest connecting rod 24 also rotates relative to the base 5, under the combined action of the first backrest connecting rod and the second backrest connecting rod 24, the backrest connecting part 8 tilts backwards while moving forwards, and the backrest connecting part 8 tilts forwards while moving backwards, so that the backward tilting and the forward tilting of the backrest 1 are realized.

As shown in fig. 27-30, the different states of the seat and the driving thereof by the single actuator 6 are switched in different states:

the stroke position of the actuator 6 is 200mm, which makes the actuator 6 retract to the shortest, which is the origin of the actuator 6 stroke.

Normal sitting: the stroke of the actuator 6 is 128.5mm, the seat 2 has a reclining angle of 8 °, the backrest 1 also tilts backwards and has an inclination of 100 ° with respect to the horizontal, the footrest now being folded under the seat 2 between the two armrests 3, on which the user can sit in a normal sitting position.

Normal sitting to assisted standing: the actuator 6 extends forwards, the stroke of the actuator is increased, the actuator 6 drives the square tube 11 to move forwards, the square tube 11 drives the transmission connecting rods 7 on the two sides to swing forwards and upwards relative to the base 5, the rotation angle is 27.5 degrees, and the first push-pull rod 14, the second push-pull rod 22 and the jacking piece 13 on the transmission connecting rods 7 move along with the rotation angle; the jacking piece 13 on the transmission connecting rod 7 moves forwards and upwards and jacks up the frame of the seat 2, so that the rear part of the seat 2 is lifted; meanwhile, the second push-pull rod 22 pulls up the first backrest connecting rod 23 along with the swinging of the transmission connecting rod 7, the rear end of the first backrest connecting rod 23 swings backwards and downwards, the backrest connecting piece 8 is enabled to incline forwards by matching with the third backrest 1 connecting rod which can only swing, and the backrest 1 inclines forwards along with the first backrest connecting rod; the auxiliary standing is not only assisted by the seat 2, but also assisted by the backrest 1 to apply forward force to the back of the human body; the movement of the seat link 12 and the footrest link assembly etc. by the first push-pull rod 14 has already been described above and, again, is not described in more detail, the footrest remains stowed under the seat 2.

Auxiliary standing: the stroke position of the actuator 6 is 200mm, the seat 2 has a forward inclination of 28 °, the backrest 1 is also inclined forward and has an inclination of 84 ° with respect to the horizontal plane, the footrest is still folded under the seat 2 between the two armrests 3, the seat assists the user in standing and the user can easily rise from the seat.

At the moment, if the seat is switched to the state of extending and putting feet, the state of assisting standing is switched to the state of normal sitting, and the stroke position of the actuator 6 is retracted from 200mm to 128.5mm; in the process, the jacking piece 13 moves backwards and downwards, the seat connecting piece 9 is pulled by the seat return spring 26 to rotate along with the jacking piece 13, and the rear part of the seat connecting piece 9 rotates downwards until the limiting plate 30 is abutted on the bearing plate 29.

Normal sitting to extend the footrest: the actuator 6 continues to retract, the transmission link 7 is pulled backwards, the transmission link 7 swings downwards and backwards relative to the base 5, the swing angle is 18.9 degrees, the first push-pull rod 14 is pulled and drives the front end of the lifting link 15 to rotate upwards and backwards, the seat link 12 and the seat link 9 which is rotatably connected with the seat link are lifted, the footrest link assembly which is rotatably connected with the seat link 12 is also lifted, the footrest push-pull rod 16 which is rotatably connected with the base 5 swings forwards and upwards along with the movement of the footrest link assembly, the footrest push-pull rod 16 pushes the first footrest link 17 forwards, the lower end of the first footrest link 17 rotates forwards and drives the third footrest link 19 to move, as the third footrest link 19 is rotatably connected with the second footrest link 18, the lower end of the second footrest link 18 also swings forwards and upwards, the fourth footrest link 20 also moves forwards and upwards along with the same, and at the same time as the fifth footrest link 21 moves forwards, the front end of the fifth footrest link 21 rotates forwards and is pushed upwards by the second spring 34, so that the front footrest link 10 is unfolded, and the leg rest 10 is unfolded upwards; meanwhile, the second push rod moves backwards to drive the front end of the first backrest connecting rod 23 to rotate backwards and downwards, the rear end of the first backrest connecting rod 23 swings forwards, the backrest connecting piece 8 tilts backwards slightly by matching with the second backrest connecting rod 24, and the backrest 1 tilts backwards slightly accordingly.

When the footrest is extended to normal sitting, the actuator 6 is extended forward, the movement of the links is reversed, and the return of the footrest attachment 10 is effected by the footrest return spring 36, as described above.

Stretching the foot rest: the stroke position of the actuator 6 is 71.9mm, the seat 2 has a back tilt of 9.5 °, the backrest 1 also tilts back and has an inclination of 115 ° with respect to the horizontal plane, the leg rest now extends to the front of the seat, the user's legs back and leg rest are raised and still can remain in a sitting position and lie back on the backrest 1.

Stretching the leg rest to lie: the actuator 6 is retracted continuously, the transmission link 7 rotates backwards continuously for 23.9 degrees, the footrest part is further extended and lifted, the seat link 12 is further lifted, so that the seat part 2 is lifted integrally, the backrest 1 moves forwards and leans backwards further, the seat part 2 is close to the backrest 1, the relative positions of the buttocks and the waist of the human body are almost kept unchanged by the movement of the backrest 1 and the seat part 2, the relative displacement between the buttocks and the waist of the human body is avoided, the back rubbing and the waist running of the human body are avoided, and the sitting posture of the user on the seat can be switched to the lying posture more comfortably.

Lying: the stroke position of the actuator 6 is 0mm, the seat 2 has a back inclination angle of 8 degrees, the backrest 1 is further inclined backwards and has an inclination angle of 145 degrees relative to the horizontal plane, and the lower part of the backrest 1 is abutted with the rear part of the seat 2; the foot rest part is further extended forwards and upwards, so that a user can lie on the seat, and the legs of the user are supported by the foot rest part.

The shape and structure of the connecting rod prevent interference in movement:

the supporting plate 29 on the seat connecting rod 12 and the limiting plate 30 on the seat connecting piece 9 enable the seat connecting rod 12 and the seat connecting piece 9 to be lapped and have a gap at the same time, so that the transmission connecting rod 7 can be contained between the seat connecting rod 12 and the seat connecting piece 9, and the movement of the seat connecting rod 12 and the movement of the seat connecting piece 9 cannot interfere with each other; the second push-pull rod 22 and the first backrest connecting rod 23 are also located in the range of the gap between the seat connecting rod 12 and the seat connecting member 9 in the width direction, so that the seat 2 does not interfere with the movement of the second push-pull rod 22 and the first backrest connecting rod 23, the rear part of the second push-pull rod 22 is bent downwards relative to the front part of the second push-pull rod, and an included angle is also formed between the front part and the rear part of the first backrest connecting rod 23, so that the seat 2 is avoided from interfering, the seat 2 and the backrest 1 can be normally close to each other, and the function of preventing the back from running and the waist rubbing is realized.

Compared with the existing mechanical stretching device 4, the mechanical stretching device 4 used by the seat of the utility model greatly simplifies the structure, only one actuator 6 is needed to switch between four states of normal sitting, auxiliary standing, stretching and lying, the number of the connecting rods is small, the structure is simple, the original complex movement becomes simple, and the movement process is more fixed and programmed (more connecting rods which can only rotate with the base 5); the rod limiting parts at a plurality of positions in each state are eliminated, the footrest connecting piece 10 and the seat connecting piece 9 are jacked up by the jacking piece 13 and fall back by the spring, and the backrest connecting piece 8 locks the positions in different states by the actuator 6; thus greatly reducing production and assembly costs, but improving reliability.

The leg rest telescoping mechanism is a first push-pull rod 14, a lifting connecting rod 15, a seat connecting rod 12, a footrest push-pull rod 16, a first footrest connecting rod 17, a second footrest connecting rod 18, a third footrest connecting rod 19, a fourth footrest connecting rod 20 and a fifth footrest connecting rod 21; the backrest leaning mechanism is a second push-pull rod 22, a first backrest connecting rod 23, a second backrest connecting rod 24 and a driven connecting rod 25; the seat overturning and moving mechanism comprises a seat connecting rod 12, a driven connecting rod 25, a transmission connecting rod 7, a first push-pull rod 14 and a lifting connecting rod 15.

Claims (8)

1. The utility model provides a prevent bracket folding mechanism of tong which characterized in that includes:

a base being a frame structure and configured as a main body support of the mechanism;

the foot stool connecting piece is used for installing a foot placing part of the seat;

the footrest connecting rod assembly is arranged on the base, is connected with the footrest connecting rod assembly and is configured to drive the footrest connecting piece to fold or extend;

the footrest connecting rod assembly comprises two groups of connecting rod sets; each connecting rod group comprises two footstool connecting rods, and in the same connecting rod group, at least one footstool connecting rod comprises a shielding part integrally formed with the footstool connecting rod; the two foot stool connecting rods of the same connecting rod group are overlapped in a staggered mode when the foot stool connecting pieces are folded, and the shielding portions are always overlapped with the other foot stool connecting rod in a staggered mode when the foot stool connecting pieces are switched from the folded state to the extended state.

2. The pinch resistant leg rest fold out mechanism of claim 1 further comprising: the footrest connecting rod assembly comprises a first footrest connecting rod, a second footrest connecting rod, a third footrest connecting rod, a fourth footrest connecting rod and a fifth footrest connecting rod, the two connecting rods are a swinging connecting rod group and a driven connecting rod group, the swinging connecting rod group comprises the first footrest connecting rod and the second footrest connecting rod, the upper ends of the first footrest connecting rod and the second footrest connecting rod are rotatably connected with the base, the driven connecting rod group comprises the third footrest connecting rod and the fourth footrest connecting rod, the upper ends of the third footrest connecting rod and the fourth footrest connecting rod are rotatably connected with the fifth footrest connecting rod, the lower end of the first footrest connecting rod is rotatably connected with the lower end of the third footrest connecting rod, the lower end of the second footrest connecting rod is rotatably connected with the lower end of the fourth footrest connecting rod, and the third footrest connecting rod is also rotatably connected with the second footrest connecting rod; the footrest connecting piece is rotationally connected with the fifth footrest connecting rod.

3. The anti-pinch leg rest folding mechanism according to claim 2, characterized in that: the first footrest connecting rod comprises a first shielding portion protruding forwards, the second footrest connecting rod comprises a second shielding portion protruding backwards, the first footrest connecting rod and the second footrest connecting rod are arranged in a staggered and overlapped mode in the folded state of the footrest connecting piece, and when the footrest connecting piece is switched to the extended state from the folded state, the first shielding portion and the second shielding portion are always overlapped in a staggered mode.

4. The anti-pinch leg rest folding mechanism according to claim 3, characterized in that: the distance between the rotating point of the first footrest connecting rod and the base and the rotating point of the second footrest connecting rod and the base is less than the sum of the widths of the first footrest connecting rod and the second footrest connecting rod; the distance between the rotating point of the third footrest connecting rod and the first footrest connecting rod and the distance between the rotating point of the third footrest connecting rod and the second footrest connecting rod are smaller than the sum of the widths of the first footrest connecting rod and the second footrest connecting rod.

5. The pinch resistant leg rest fold out mechanism of claim 2 further comprising: the third footstool connecting rod comprises a third shielding part protruding forwards, the third footstool connecting rod and the fourth footstool connecting rod are arranged in a staggered and overlapped mode in the folding state of the footstool connecting piece, and when the footstool connecting piece is switched to the extending state from the folding state, the third shielding part and the fourth footstool connecting rod are always overlapped in a staggered mode.

6. The anti-pinch leg rest folding mechanism according to claim 5, characterized in that: the distance between the rotating points of the third footrest connecting rod and the fifth footrest connecting rod and the distance between the rotating points of the fourth footrest connecting rod and the fifth footrest connecting rod are smaller than the sum of the widths of the third footrest connecting rod and the fourth footrest connecting rod; the distance between the rotating points of the third footrest connecting rod and the second footrest connecting rod and the distance between the rotating points of the fourth footrest connecting rod and the second footrest connecting rod are smaller than the sum of the widths of the third footrest connecting rod and the fourth footrest connecting rod.

7. The anti-pinch leg rest folding mechanism according to claim 2, characterized in that: and a second spring fixing column is arranged on the fifth footstool connecting rod, when the footstool connecting piece is switched to an extending state from a furling state, the footstool connecting rod assembly extends, and the second spring fixing column jacks up the footstool connecting piece.

8. The anti-pinch leg rest folding mechanism according to claim 6, characterized in that: be equipped with third spring fixing column on the footrest connecting piece, be equipped with bracket return spring between second spring fixing column and the third spring fixing column.

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