CN219835770U - Wheelchair with linkage adjustment backrest and foot rest - Google Patents

Abstract

The utility model discloses a wheelchair with a linkage adjusting backrest and a foot rest, wherein a backrest cushion is connected to a backrest frame of the wheelchair; the ground wheel device is connected to the lower part of the chair seat frame; the top of the chair seat frame is connected with a seat cushion; the lower part of the backrest frame is hinged with the rear part of the chair seat frame; the upper part of the front foot rest is hinged with the front top of the chair seat frame; a foot rest linkage adjusting device is movably hinged between the lower section of the backrest frame and the middle part of the front foot rest; when the backrest frame is adjusted in a anticlockwise backward overturning manner, the backrest frame synchronously drives the foot rest linkage adjusting device to push the front foot rest forward so as to upwards overturn and lift the front foot rest anticlockwise and adjust the inclination angle of the front foot rest in a follow-up manner; when the backrest frame is turned forwards clockwise for adjustment, the backrest frame synchronously drives the foot rest linkage adjusting device to pull the front foot rest backwards so as to turn downwards clockwise for lowering the front foot rest and adjusting the inclination angle of the front foot rest in a follow-up way; the front foot rest does not need to independently adjust the inclination angle, and can be realized in a linkage way by only adjusting the backrest frame, so that the operation and the adjustment are convenient.

Description

Wheelchair with linkage adjustment backrest and foot rest

Technical Field

The utility model relates to a wheelchair, in particular to a wheelchair with a linkage adjusting backrest and a foot rest.

Background

For example, 1: chinese patent literature publication No.: CN218529092U discloses a multifunctional wheelchair with an adjustable back rest angle, comprising a front wheel, a front foot rest, a rear wheel, a rear foot rest, a seat plate, a seat frame, a backrest and a hinged folding support device, wherein the front wheel is arranged at the bottom of the left side and the right side of the front foot rest, the rear wheel is arranged at the bottom of the left side and the right side of the rear foot rest, the seat plate is fixedly connected with the seat frame, the hinged folding support device is hinged with the rear foot rest, the backrest comprises a lower section backrest frame, an upper section backrest frame and a backrest cushion, the upper section backrest frame is fixedly connected with the backrest cushion, the upper section backrest frame is hinged with the lower section backrest frame, the backrest angle of 0-45 degrees can be adjusted by overturning the upper section backrest frame based on the lower section backrest frame, the hinge point is close to the rear top of the seat plate, and the left side and the right side rear part of the seat frame are hinged with the left side and the right side of the upper section backrest frame; the bottom of the lower section backrest frame is movably connected with the hinged folding supporting device; and a backrest angle adjusting, positioning and supporting device is hinged between the upper section backrest frame and the lower section backrest frame. A pedal frame is connected below the front foot rest; the pedal frame comprises a pedal, a front connecting pipe frame and a rear connecting pipe frame, wherein the pedal is fixedly arranged on the front connecting pipe frame, a pipe body of the rear connecting pipe frame is inserted into a pipe hole of the front connecting pipe frame, the front connecting pipe frame and the rear connecting pipe frame are in telescopic adjustment, and the telescopic length between the front connecting pipe frame and the rear connecting pipe frame is fixed through a locking device.

The above patent discloses that the wheelchair can adjust the back turning angle of the backrest so as to meet the requirement of lying back for rest; the pedal frame comprises pedals, a front connecting pipe frame and a rear connecting pipe frame, the front connecting pipe frame and the rear connecting pipe frame can be telescopically adjusted, and the pedal frame is not lifted or lowered in a turnover mode; when the back of the backrest is lowered and the person lies down for rest, the bending angle between the lower leg and the thigh is too small and too bending is felt to be uncomfortable, the rest is not good, and the blood circulation of the lower leg and the foot plate is not facilitated.

For example 2: chinese patent literature publication No.: CN212913602U discloses a wheelchair for nursing of cardiology department, including supporting seat (1), the bottom left and right sides of supporting seat (1) all fixedly connected with supporting leg (2), the bottom of supporting leg (2) is provided with universal wheel (3), the back of supporting leg (2) is provided with connecting rod (9), the equal swing joint in front left and right sides of supporting seat (1) has movable rod (5), be provided with first pneumatic cylinder (8) between movable rod (5) and connecting rod (9), the intermediate position of movable rod (5) is provided with puts leg board (6), the bottom of movable rod (5) is provided with footboard (7), the top of connecting rod (9) is provided with removes round (11), the top left and right sides of supporting seat (1) all is provided with universal wheel (12), the back left and right sides of supporting seat (1) all is provided with connecting rod (27), the top swing joint of movable shaft (27) has backplate (13), the intermediate position (20) are provided with between backplate (14) and cushion (19), the toilet bowl is characterized in that a bedpan (4) is arranged at the bottom relative movement plate (20) of the supporting seat (1), safety belts (18) are arranged on the left side wall and the right side wall of the back plate (13), a back cushion (15) is arranged on the front surface of the back plate (13), a headrest (17) is arranged at the top of the back cushion (15), a supporting frame (26) is arranged at the bottom of the rear side of the supporting seat (1), a second hydraulic cylinder (25) is arranged between the back plate (13) and the supporting frame (26), and pushing handles (21) are arranged on the left side and the right side of the back surface of the back plate (13).

A first hydraulic cylinder (8) is arranged between the pedal frame movable rod (5) of the wheelchair and the connecting rod (9) of the chair seat frame, the overturning angle of the pedal frame is adjusted through the first hydraulic cylinder (8), namely, the lifting or lowering of the pedal frame is adjusted, the first hydraulic cylinder (8) needs to be adjusted independently and manually, and the backboard (13) is independently adjusted after overturning relative to the supporting seat (1); the pedal frame and the back board (13) are separately and independently adjusted, the adjustment is inconvenient and troublesome, and the pedal frame is particularly not used by people with inconvenient actions such as the old, the weak, the sick and the disabled, and the hands and feet are inflexible.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the wheelchair with the linkage adjustment backrest and the foot rest, which has reasonable structure, is provided with the linkage adjustment device for the foot rest between the front foot rest and the backrest frame, and can synchronously adjust the front foot rest in a linkage way when adjusting the backrest frame, so that a user can conveniently use the wheelchair with the linkage adjustment backrest and the foot rest.

The scheme for solving the technical problems is as follows:

a wheelchair with a linkage adjustment backrest and a foot rest comprises a foot drop wheel device, a seat frame, a front foot rest, a seat cushion, a backrest frame and a backrest cushion; the backrest frame is connected with a backrest cushion; the ground wheel device is connected to the lower part of the chair seat frame; the ground wheel device is used for enabling the wheelchair to move in a rolling manner; the top of the chair seat frame is connected with a seat cushion; the lower part of the backrest frame is hinged with the rear part of the chair seat frame; the device also comprises a foot rest linkage adjusting device; the upper part of the front foot rest is hinged with the front top of the chair seat frame; the lower section of the backrest frame is hinged with one end of the foot rest linkage adjusting device, and the other end of the foot rest linkage adjusting device is hinged with the middle part of the front foot rest; the foot rest linkage adjusting device passes through or is arranged at one side of the seat frame; when the backrest frame is adjusted in a anticlockwise backward overturning manner, the backrest frame synchronously drives the foot rest linkage adjusting device to push the front foot rest forward so as to upwards overturn and lift the front foot rest anticlockwise and adjust the inclination angle of the front foot rest in a follow-up manner; when the backrest frame is turned forwards clockwise, the backrest frame synchronously drives the foot rest linkage adjusting device to pull the front foot rest backwards so as to turn downwards clockwise to lower the front foot rest and adjust the inclination angle of the front foot rest in a follow-up manner.

The wheelchair with the linkage adjusting backrest and the foot rest has the beneficial effects that: this product is when people overturn and adjust back frame, and preceding foot rest passes through foot rest linkage adjusting device and realizes synchronous regulation, and preceding foot rest need not independent adjustment inclination, and only adjusts back frame and can link and realize, and its operation is adjusted conveniently, and easy operation is convenient, and back frame is pressed after lying after the people can link adjustment and is raised preceding foot rest, makes things convenient for preceding foot rest to hold up people's foot in step, makes the upper body of people and foot more crooked coordinated rest, and rest is more comfortable after lying down.

Drawings

FIGS. 1, 2, 3 and 4 are perspective views of the product of the present utility model;

FIGS. 5 and 6 are perspective views of the product of the present utility model excluding the rear casters;

FIG. 7 is a disassembled view of the chair seat frame, front foot rest and foot rest linkage adjusting device of the utility model;

FIG. 8 is a perspective view of a chair seat of the product of the present utility model;

FIG. 9 is a perspective view of the back rest frame, back rest flip angle adjustment positioning support device of the present utility model;

FIG. 10 is a perspective view of the foot rest linkage adjustment device of the present utility model;

FIGS. 11 and 12 are perspective views of the product of the present utility model with the left and right armrest frames open;

Fig. 13, 14 and 15 are schematic views of the front foot rest of the product of the utility model, which is turned back and lowered and turned upwards and raised.

The foot rest device comprises a foot falling wheel device A, a seat frame B, a front foot rest C, a seat cushion D, a backrest frame E, a backrest cushion F, a foot rest linkage adjusting device G, a backrest overturning angle adjusting and positioning supporting device H, a left armrest frame I, a left elastic lock catch I1, a right armrest frame J, a right elastic lock catch J1, a headrest K, a left side braking device L, a right side braking device N, a backrest left adjusting hand brake H1, a backrest left air rod H2, a backrest right adjusting hand brake H3, a backrest right air rod H4, a left steel wire rope H5, a right steel wire rope H6, a backrest left vertical rod E1, a backrest right vertical rod E2, a backrest cross rod E3, a left lower U-shaped fork E11, a right lower U-shaped fork E21, a left front trundle A1, a right front trundle A2, a left rear trundle device A3, a right rear trundle device A4, a left rear trundle A31, a left rear shock absorbing device A32, a left transverse hinging piece A321, a left vertical cylinder A322, a right rear trundle A41, a backrest trundle A41 and a backrest right vertical rod E the left rear shock absorbing device A42, the right transverse hinge A421, the right vertical shock absorbing cylinder A422, the left rod penetrating hole B1, the right rod penetrating hole B2, the left upper U-shaped fork B3, the right upper U-shaped fork B4, the left locking hole B5, the right locking hole B6, the left pedal frame C1, the right pedal frame C2, the rear section curved plate power transmission device G1, the middle section transverse power synchronous transmission device G2, the front section power synchronous transmission device G3, the left rear inclined connecting plate G11, the left rear inclined connecting plate G12, the right rear inclined connecting plate G13, the right rear inclined connecting plate G14, the left transverse driving plate G21, the left transverse driving rod G22, the right transverse driving plate G23, the right transverse driving rod G24, the left foot rest connecting plate G31, the right foot rest connecting plate G32, the left L-shaped rod C11, the left calf support pad C12, the left pedal C13, the right L-shaped rod C21, the right calf support pad C22 and the right pedal C23.

Detailed Description

A wheelchair with a linkage adjustment backrest and a foot rest comprises a foot falling wheel device A, a seat frame B, a front foot rest C, a seat cushion D, a backrest frame E and a backrest cushion F; the backrest frame E and the backrest cushion F form a wheelchair backrest; the seat frame B and the seat cushion D form a wheelchair seat; the chair seat B belongs to the prior art; the backrest frame E and the chair seat frame B are made of aluminum or iron metal pipes; the seat cushion D and the backrest cushion F are made of cloth or leather or plastic plates or metal plates or wood plates or cloth-wrapped sponge or cloth-wrapped plastic plates or cloth-wrapped metal plates or cloth-wrapped wood plates or leather-wrapped plastic plates or leather-wrapped metal plates or leather-wrapped wood plates, and the like; the width of the wheelchair is 40 cm-80 cm; the front foot rest C is used for foot pedal/foot supporting of a person;

the backrest frame E is sleeved with or fixedly connected with a backrest cushion F through a connecting structure such as a nail body or a stitch joint; the ground wheel device A is fixedly connected to the lower part of the chair seat frame B, and is used for enabling the wheelchair to move in a rolling way and pushing the wheelchair to move forwards or backwards; the top of the seat frame B is sleeved or fixedly connected with a seat cushion D through a connecting structure such as a nail body or a stitch, when the seat cushion D is made of soft materials such as cloth or leather, the seat cushion D is connected to a cross rod of the seat frame B through the sleeved or stitch structure for fixation, when the seat cushion D is made of hard materials such as a plastic plate or a metal plate or a wood plate, the seat cushion D is riveted or screwed and connected to the cross rod of the seat frame B for fixation through the nail body, and the height from the seat cushion D to the ground is 40 cm-60 cm; the lower part of the backrest frame E is hinged with the rear part of the chair seat frame B, so that the backrest frame E can be adjusted in a backward overturning/lying way relative to the chair seat frame B, the overturning adjustment is 0-70 degrees, and a person can conveniently sit on the seat cushion D and then can recline after the backrest frame E is adjusted according to the requirement;

The main technical improvement of the product is as follows: the wheelchair with the linkage adjustment backrest and the foot rest also comprises a foot rest linkage adjustment device G;

the upper part of the front foot rest C is hinged with the front top of the chair seat frame B, so that the front foot rest C can be turned up and down for movable adjustment relative to the chair seat frame B;

the lower section of the backrest frame E is hinged/movably connected with one end of a foot rest linkage adjusting device G, and the other end of the foot rest linkage adjusting device G is hinged/movably connected with the middle part of a front foot rest C; the foot rest linkage adjusting device G passes through or is arranged on one side of the seat frame B, and a proper arrangement position is arranged for the foot rest linkage adjusting device G;

when the backrest frame E is adjusted in a anticlockwise backward overturning manner, the backrest frame E synchronously drives the foot rest linkage adjusting device G to push the front foot rest C forwards so as to upwards overturn and lift the front foot rest C anticlockwise and adjust the inclination angle of the front foot rest C in a follow-up manner;

when the backrest frame E is turned forwards clockwise for adjustment, the backrest frame E synchronously drives the foot rest linkage adjusting device G to pull the front foot rest C backwards so as to turn downwards clockwise for lowering the front foot rest C and adjusting the inclination angle of the front foot rest C in a follow-up manner.

According to the structure, when a person turns over and adjusts the backrest frame E, the foot rest linkage adjusting device G is used for transmitting driving force, the front foot rest C is synchronously adjusted through the foot rest linkage adjusting device G, the front foot rest C does not need to independently adjust the inclination angle, and can be in linkage with the backrest frame E, so that the operation and the adjustment are convenient, the operation are easy, the person can conveniently lie back and then press the backrest frame E to realize linkage adjustment and elevation of the front foot rest C, the front foot rest C is convenient for synchronously supporting the feet of the person, the upper body and the feet of the person are more bent and coordinated to rest, and the person can lie back and rest more comfortably; the back turning rotation inclination angle of the backrest frame E is coordinated with the turning lifting inclination angle of the front foot rest C, the inclination angle is coordinated, and the synchronous coordination work effect of the back turning rotation inclination angle and the front foot rest C is good, for example: the back rest E is inclined by 45 degrees, so that the lifting inclination angle of the front foot rest C is also 45 degrees; the front foot rest C is supported and lifted stably and motionless through the foot rest linkage adjusting device G, and the foot rest linkage adjusting device G is supported stably and prevented from retreating through the lower support of the backrest frame E.

The preferred technical scheme is as follows: the foot rest linkage adjusting device G is made of aluminum or iron metal; the foot rest linkage adjusting device G comprises a rear section curved plate power transmission device G1, a middle section transverse power synchronous transmission device G2 and a front section power synchronous transmission device G3, wherein the upper part of the rear section curved plate power transmission device G1 is hinged with the lower section of the backrest frame E, the lower part of the rear section curved plate power transmission device G1 is hinged with the rear part of the middle section transverse power synchronous transmission device G2, the front part of the middle section transverse power synchronous transmission device G2 is hinged with the rear part of the front section power synchronous transmission device G3, and the front part of the front section power synchronous transmission device G3 is hinged with the middle part of the front foot rest C; the specific structure of the foot rest linkage adjusting device G is further refined; the backrest frame E and the front foot rest C are far away, and are arranged at the front and rear parts of the chair seat frame B in a vertically staggered manner, the backrest frame E is arranged at the rear upper part of the chair seat frame B, and the front foot rest C is arranged at the front lower part of the chair seat frame B in a staggered manner; therefore, the foot rest linkage adjusting device G is divided into a plurality of sections, and the rear section curved sheet power transmission device G1 provides power bending steering transmission; the backrest frame E and the front foot rest C are arranged in front of the chair seat frame B, so that a middle section transverse power synchronous transmission device G2 is arranged for transverse power transmission; the front foot rest C is required to be overturned up and down to be lifted or lowered, so that the front foot rest C is required to be movably pushed or pulled by an independent front section power synchronous transmission device G3; the back rest E turns over the power to drive the back section and curved the power transmission device G1 to move up and down, the transmission power that the back section curved the power transmission device G1 moves up and down is changed into the horizontal transmission power through the horizontal power synchronous transmission device G2 of middle section, the horizontal transmission power of the horizontal power synchronous transmission device G2 of middle section is changed into the power that can turn over through the synchronous transmission device G3 of front section, in order to drive the front foot rest C to raise and lower in a turnover way; the whole power transmission and power conversion are convenient, and the structure design is reasonable, and the power transmission and conversion effect is good.

The preferred technical scheme is as follows: the rear section bent sheet power transmission device G1 comprises a left rear inclined connecting sheet G11, a left rear bending connecting sheet G12, a right rear inclined connecting sheet G13 and a right rear bending connecting sheet G14;

the middle section transverse power synchronous transmission device G2 comprises a left transverse driving piece G21, a left transverse driving rod G22, a right transverse driving piece G23 and a right transverse driving rod G24;

the front-section power synchronous transmission device G3 comprises a left foot rest connecting piece G31 and a right foot rest connecting piece G32, and the left foot rest connecting piece G31 and the right foot rest connecting piece G32 are obliquely arranged upwards, so that the front foot rest can be conveniently pushed/pulled, and the front foot rest can be prevented from being blocked;

the rear section curved piece power transmission device G1, the middle section transverse power synchronous transmission device G2 and the front section power synchronous transmission device G3 are reasonably arranged according to the actual condition and the structure of the wheelchair;

the upper end of the left back inclined connecting piece G11 is hinged with the left back side of the lower section of the backrest frame E (namely, a screw hole is formed at the left back of the lower section of the backrest frame E, a screw hole is formed at the upper end of the left back inclined connecting piece G11, the two screw holes jointly cross the screw holes for fixedly connecting and preventing the screw holes from falling off, the lower end of the left back inclined connecting piece G11 is hinged with the upper end of the left back bent connecting piece G12 (namely, the screw hole is formed at the lower end of the left back inclined connecting piece G11, the screw hole is formed at the upper end of the left back bent connecting piece G12, the screw holes jointly cross the screw holes for fixedly connecting and preventing the screw holes from falling off, the lower end of the left back bent connecting piece G12 is hinged with the rear end of the left transverse driving piece G21 (namely, the screw holes are formed at the lower end of the left back bent connecting piece G12, the screw holes are jointly cross the screw holes for fixedly connecting and preventing the screw holes for connecting and preventing the screw holes from falling off, the left transverse driving piece G21) are formed at the rear end of the left transverse driving piece G21, namely, the screw holes are jointly cross the front end of the left transverse driving piece G22 and the left transverse connecting piece G22 are formed at the front end of the left transverse connecting piece G22;

The upper end of the right rear inclined connecting piece G13 is hinged with the right rear side of the lower section of the backrest frame E (namely, a screw hole is formed at the right rear of the lower section of the backrest frame E, a screw hole is formed at the upper end of the right rear inclined connecting piece G13, the two screw holes jointly cross the screw holes for screwing the screw holes to fixedly connect the screw holes to form movable hinged connection), the lower end of the right rear inclined connecting piece G13 is hinged with the upper end of the right rear curved connecting piece G14 (namely, a screw hole is formed at the lower end of the right rear inclined connecting piece G13, a screw hole is formed at the upper end of the right rear curved connecting piece G14, the screw holes jointly cross the screw holes for fixedly connecting the screw holes to prevent the screw holes from falling off, the lower end of the right rear curved connecting piece G14 is hinged connection with the rear end of the right transverse driving piece G23 (namely, the screw holes are jointly screwed to form movable hinged connection between the screw holes of the right transverse driving piece G24 and the right transverse connecting piece G24) and the front end of the right transverse driving piece G24;

The front ends of the left foot rest connecting piece G31 and the right foot rest connecting piece G32 are hinged with the middle part of the front foot rest C (namely, the front end of the left foot rest connecting piece G31 is provided with a corresponding screw hole, the left side of the middle part of the front foot rest C is provided with a corresponding left screw hole, the screw hole of the left foot rest connecting piece G31 and the left side screw hole of the middle part of the front foot rest C are jointly crossed and screwed with screws so as to enable the left foot rest connecting piece G31 and the left side screw hole of the middle part of the front foot rest C to be fixedly connected and prevented from falling off, the front end of the right foot rest connecting piece G32 is provided with a corresponding screw hole, the right side screw hole of the middle part of the front foot rest C is jointly crossed and screwed with the right side screw hole of the middle part of the front foot rest C so as to enable the right foot rest connecting piece G32 and the right side screw hole of the middle part of the front foot rest C to jointly cross and screwed with screws so as to enable the left foot rest connecting piece C and the left side screw hole to be fixedly connected and prevented from falling off.

Because the height and the weight of people are different, the front foot rest C is pedal by the left foot and the right foot of people simultaneously, the left side and the right side are stressed, and for the stability and the balance of the stress of the left side and the right side simultaneously, the foot placement support is more stable and does not shake, so that the left side and the right side are symmetrically arranged: the left rear tilting linkage plate G11, the left rear bending linkage plate G12, the right rear tilting linkage plate G13, the right rear bending linkage plate G14, the left transverse driving plate G21, the left transverse driving rod G22, the right transverse driving plate G23, the right transverse driving rod G24, the left foot rest linkage plate G31 and the right foot rest linkage plate G32 synchronously transmit power on the left side and the right side, simultaneously support/support the front foot rest C, and push/pull the front foot rest C during power transmission.

The rear section curved piece power transmission device G1, the middle section transverse power synchronous transmission device G2 and the front section power synchronous transmission device G3 are composed of specific parts and connection structures among the specific parts, the parts are arranged according to the actual structure of the wheelchair, and the movable connection of the parts is convenient for power transmission and power conversion.

The preferred technical scheme is as follows: the front foot rest C comprises a left foot rest C1 and a right foot rest C2, and the left foot rest C1 and the right foot rest C2 are respectively and independently arranged; the left foot rest C1 and the right foot rest C2 are respectively used by corresponding left feet and right feet of a person, so that the use is more flexible;

the upper part of the left pedal frame C1 is hinged with the left front top of the chair seat frame B (namely, the left front top of the chair seat frame B is connected with a left upper U-shaped fork B3, the left upper U-shaped fork B3 is transversely provided with a screw hole, the top of the left pedal frame C1 is also transversely provided with a screw hole, a head of the top of the left pedal frame C1 is inserted into the U-shaped fork hole to prevent left and right shaking, and the two screw holes transversely penetrate through a screw joint so as to lead the screw joint to be fixedly connected and prevent the screw joint from falling off, so that the screw joint and the screw joint form movable hinged connection); the upper part of the right pedal frame C2 is hinged with the right front top of the chair seat frame B (namely, the right front top of the chair seat frame B is connected with a right upper U-shaped fork B4, the right upper U-shaped fork B4 is transversely provided with a screw hole, the top of the right pedal frame C2 is also transversely provided with a screw hole, a head of the top of the right pedal frame C2 is inserted into the U-shaped fork hole to prevent left and right shaking, and the two screw holes transversely penetrate through a screw joint so as to lead the screw joint to be fixedly connected and prevented from falling off, so that the screw joint and the screw joint form movable hinged connection);

The front end of the left foot rest connecting piece G31 is hinged with the middle part of the left foot rest frame C1 (namely, the front end of the left foot rest connecting piece G31 is provided with a corresponding screw hole, the middle part of the left foot rest frame C1 is provided with a corresponding left screw hole, the screw hole of the left foot rest connecting piece G31 and the left screw hole in the middle part of the left foot rest frame C1 are crossed and screwed with screws together so as to ensure that the screw holes are fixedly connected and prevented from falling off, so that the screw holes form movable hinged connection);

the front end of the right foot rest connecting piece G32 is hinged with the middle part of the right foot rest frame C2 (namely, the front end of the right foot rest connecting piece G32 is provided with a corresponding screw hole, the right side of the middle part of the right foot rest frame C2 is provided with a corresponding right screw hole, and the screw hole of the right foot rest connecting piece G32 and the right side screw hole of the middle part of the right foot rest frame C2 are jointly crossed and screwed with a screw so as to ensure that the screw hole and the right screw hole are fixedly connected and prevented from falling off, so that the screw hole and the right screw hole form movable hinged connection.

The backrest frame E is divided into two paths of power to respectively drive and control the corresponding left pedal frame C1 and right pedal frame C2 to turn and adjust, the left pedal frame C1 on the left side is controlled by the left rear inclined connecting piece G11, the left rear curved connecting piece G12, the left transverse driving piece G21, the left transverse driving rod G22 and the left foot rest connecting piece G31 in a linkage manner, and the right pedal frame C2 on the right side is controlled by the right rear inclined connecting piece G13, the right rear curved connecting piece G14, the right transverse driving piece G23, the right transverse driving rod G24 and the right foot rest connecting piece G32 in a linkage manner; when the backrest frame E is turned backwards anticlockwise, the left rear inclined connecting piece G11 and the right rear inclined connecting piece G13 obliquely push the corresponding left rear bending connecting piece G12 and right rear bending connecting piece G14 to turn upwards, the left rear bending connecting piece G12 and the right rear bending connecting piece G14 synchronously push the left transverse driving piece G21 and the right transverse driving piece G23 to move forwards, the left transverse driving piece G21 and the right transverse driving piece G23 synchronously push the left transverse driving rod G22 and the right transverse driving rod G24 to move forwards, the left foot rest connecting piece G31 and the right foot rest connecting piece G32 are turned upwards anticlockwise, and the left foot rest frame C1 and the right foot rest frame C2 are synchronously adjusted to be lifted; during adjustment, when the backrest frame E is turned clockwise, the left rear inclined connecting piece G11 and the right rear inclined connecting piece G13 obliquely pull the corresponding left rear bending connecting piece G12 and right rear bending connecting piece G14 to turn reversely, the left rear bending connecting piece G12 and the right rear bending connecting piece G14 synchronously pull the left transverse driving piece G21 and the right transverse driving piece G23 to move backwards, the left transverse driving piece G21 and the right transverse driving piece G23 synchronously pull the left transverse driving rod G22 and the right transverse driving rod G24 to move backwards, the left foot rest connecting piece G31 and the right foot rest connecting piece G32 are turned upwards and clockwise, and the left foot rest frame C1 and the right foot rest frame C2 are adjusted to be lowered.

The preferred technical scheme is as follows: the left side of the chair seat frame B is provided with a left rod penetrating hole B1, and a left transverse driving rod G22 movably penetrates through the left rod penetrating hole B1 and is used for supporting the left transverse driving rod G22, so that the transmission power is more stable; the right side of the seat frame B is provided with a right rod penetrating hole B2 for supporting a right transverse driving rod G24, the transmission power is more stable, and the right transverse driving rod G24 movably penetrates through the right rod penetrating hole B2.

The preferred technical scheme is as follows: the foot falling wheel device A comprises a left front castor A1, a right front castor A2, a left rear castor device A3 and a right rear castor device A4, wherein the left front castor A1 and the right front castor A2 are respectively connected with the left front bottom and the right front bottom corresponding to the chair seat frame B through screw nut components; the left rear caster device A3 and the right rear caster device A4 are respectively connected to the left rear lower part and the right rear lower part corresponding to the chair seat frame B; the left front castor A1 and the right front castor A2 are products in the prior art; the foot wheel is composed of the foot wheel falling device A, the wheelchair is convenient to push, the pushing is more stable, and the sitting of a person is more stable.

The preferred technical scheme is as follows: the left rear trundle device A3 comprises a left rear trundle A31 and a left rear shock absorbing device A32, the left rear trundle A31 is movably connected with the left rear shock absorbing device A32, so that the left rear trundle A31 can rotate, and the left rear trundle A31 is a product in the prior art; the left rear shock-absorbing device A32 is connected with the corresponding left rear lower part of the chair seat frame B, and the left rear shock-absorbing device A32 provides shock absorption/shock absorption function for the rolling of the left rear caster A31; the right rear trundle device A4 comprises a right rear trundle A41 and a right rear shock absorbing device A42, the right rear trundle A41 is movably connected with the right rear shock absorbing device A42, so that the right rear trundle A41 can rotate, and the right rear trundle A41 is a product in the prior art; the right rear shock-absorbing device A42 is connected with the corresponding right rear lower part of the chair seat frame B, and the right rear shock-absorbing device A42 provides shock absorption/shock absorption function for the rolling of the right rear caster A41;

The left rear shock-absorbing device A32, the left rear shock-absorbing device A32 provides the whole rolling pushing shock-absorbing/shock-absorbing function for the wheelchair, and people can sit on the wheelchair more comfortably.

The preferred technical scheme is as follows: the left rear shock absorbing device A32 comprises a left transverse hinging piece A321 and a left vertical shock absorbing cylinder A322, wherein the left transverse hinging piece A321 is transversely arranged, the left vertical shock absorbing cylinder A322 is vertically arranged, one end of the left transverse hinging piece A321 is movably connected with the left rear lower part of the seat frame B, the other end of the left transverse hinging piece A321 is movably connected with the telescopic rod end of the left vertical shock absorbing cylinder A322 (namely, a screw hole is formed at one end of the left transverse hinging piece A321, a screw hole is also formed at the left rear lower part vertical frame piece of the seat frame B, the two screw holes are jointly crossed and screwed to enable the screw holes to be fixedly connected with the left rear lower part of the seat frame B, namely, a screw hole is formed at one end of the left transverse hinging piece A321, a screw hole is formed at the left rear lower part of the seat frame B, a caster wheel assembly is fixedly connected with the left rear lower part of the seat frame A31, and the left transverse hinging piece A is fixedly connected with the left rear lower part of the seat frame B, the left transverse hinging piece A is fixedly connected with the left rear lower part of the caster assembly; the shock absorption/vibration absorption structure is specific, the left rear caster A31 realizes the shock absorption/vibration absorption function through the left vertical vibration absorption cylinder A322, and the shock absorption/vibration absorption effect is good;

The right rear shock absorbing device A42 comprises a right transverse hinging piece A421 and a right vertical shock absorbing cylinder A422, wherein the right transverse hinging piece A421 is transversely arranged, the right vertical shock absorbing cylinder A422 is vertically arranged, one end of the right transverse hinging piece A421 is movably connected with the right rear lower part of the seat frame B, the other end of the right transverse hinging piece A421 is movably connected with the telescopic rod end of the right vertical shock absorbing cylinder A422 (namely, a screw hole is formed at one end of the right transverse hinging piece A421, a screw hole is also formed at the right rear lower part of the seat frame B, the two screw holes are jointly crossed and screwed to enable the two screw holes to be fixedly connected with the anti-drop device, namely, a screw hole is formed at the right rear lower part of the seat frame B, a screw hole is formed at the right transverse hinging piece A422, a caster wheel assembly is also formed at the right rear lower part of the seat frame B, the two screw holes are jointly screwed to enable the two screw holes to be fixedly connected with the right rear lower part of the seat frame B, and the two screw holes are jointly screwed to enable the two screw holes to be fixedly connected with the anti-drop device A41 to form movable hinging connection. The shock absorption/vibration absorption structure is specific, the shock absorption/vibration absorption function of the right rear caster A41 is realized through the right vertical vibration absorption cylinder A422, and the shock absorption/vibration absorption effect is good;

The left and right vertical shock absorbing cylinders A422 provide shock absorption/shock absorption for the wheelchair, and the shock absorption/shock absorption is balanced.

The preferred technical scheme is as follows: the backrest overturning angle adjusting, positioning and supporting device H is movably connected between the rear middle part of the backrest frame E and the middle lower part of the chair seat frame B, and is an angle required by fixing the backrest frame E after overturning.

The preferred technical scheme is as follows: the backrest overturning angle adjusting, positioning and supporting device H comprises a backrest left adjusting hand brake H1, a backrest left air rod H2, a backrest right adjusting hand brake H3 and a backrest right air rod H4, wherein the backrest left air rod H2 and the backrest right air rod H4 are positioned at the left side and the right side of a backrest frame E and are longitudinally arranged, and the left side and the right side of the top of the backrest frame E are fixedly connected with the backrest left adjusting hand brake H1 and the backrest right adjusting hand brake H3 through screw assemblies;

the back middle part of the left side of the backrest frame E is movably connected with the top of the telescopic rod of the left backrest air rod H2 (namely, a screw hole is formed in the back middle part of the left side of the backrest frame E, a screw hole is also formed in the top of the telescopic rod of the left backrest air rod H2, the two screw holes are jointly crossed and screwed with screws to enable the screw holes to be fixedly connected and anti-drop, so that the screw holes form movable hinged connection), the bottom of the base of the left backrest air rod H2 is movably connected with the middle lower part of the left back side of the chair seat frame B (namely, the screw hole is formed in the bottom of the base of the left backrest air rod H2, the screw hole is also formed in the middle lower part of the left back side of the chair seat frame B, and the two screw holes are jointly crossed and screwed with the screw holes to enable the screw holes to be fixedly connected and anti-drop, so that the movable hinged connection is formed;

The rear middle part of the right side of the backrest frame E is movably connected with the top of the telescopic rod of the right backrest air rod H4 (namely, a screw hole is formed in the rear middle part of the right side of the backrest frame E, a screw hole is also formed in the top of the telescopic rod of the right backrest air rod H4, the two screw holes are mutually crossed and screwed with screws to enable the two screw holes to be fixedly connected and anti-drop, so that the two screw holes form movable hinged connection), the bottom of the base of the right backrest air rod H4 is movably connected with the middle lower part of the right rear side of the seat frame B (namely, the screw hole is formed in the bottom of the base of the right backrest air rod H4, the screw hole is also formed in the middle lower part of the right rear side of the seat frame B, and the two screw holes are mutually crossed and screwed with the screws to enable the screw holes to be fixedly connected and anti-drop, so that the two screw holes form movable hinged connection);

the backrest left adjusting hand brake H1 is connected with a valve of a backrest left air rod H2 through a left steel wire rope H5; the backrest right adjusting hand brake H3 is connected with a valve of a backrest right air rod H4 through a right steel wire rope H6; when the back rest is used, a person stands at the rear part of the wheelchair, holds the handles close to the back rest frame E by two hands respectively and grabs the corresponding back rest left-adjusting hand brake H1 and the back rest right-adjusting hand brake H3, when the hand is stressed and tightened, the back rest left-adjusting hand brake H1 and the back rest right-adjusting hand brake H3 synchronously pull the left steel wire rope H5 and the right steel wire rope H6 corresponding to the left side and the right side, the steel wire ropes are lifted upwards, the valves of the corresponding back rest left air rod H2 and the valves of the back rest right air rod H4 are opened, the internal air sources of the back rest left air rod H2 and the back rest right air rod H4 can circulate inside and outside, at the moment, the back rest frame E can be turned over to adjust the angle required to lie back, after the back rest frame E is fixed in a back lying turnover angle, the two hands loosen the back rest left-adjusting hand brake H1 and the back rest right-adjusting hand brake H3, the left steel wire rope H5 and the right steel wire rope H6 are loosened, the valves of the back rest left air rod H2 and the back rest right air rod H4 are closed by the elastic reset property of the valves, the valves of the back rest left air rod H4 are opened, and the internal air sources can not be turned over by the back rest left air rod H2, and the internal air source can be turned back and the back rest air rod and the back rest, and the back rest air rod can not be turned back and the back rest, and the rest air can be rotated by the back and the back rest.

The preferred technical scheme is as follows: the backrest frame E comprises a backrest left vertical rod E1, a backrest right vertical rod E2 and a backrest cross rod E3, wherein the left end and the right end of the backrest cross rod E3 are connected with the backrest left vertical rod E1 and the backrest right vertical rod E2 to form the backrest frame E in a fixed connection manner; the bottom of the backrest left vertical rod E1 is connected with a left lower U-shaped fork E11, and a left vertical rod lower screw hole is transversely formed in the left lower U-shaped fork E11; the left rear upper corner joint of the seat frame B is provided with a left rear upper corner screw hole of the seat frame; the left rear upper corner joint of the seat frame B is inserted into the left lower U-shaped fork E11, so that the backrest frame E is prevented from swinging left and right, and a positioning effect is achieved; the left vertical rod lower screw hole and the seat frame left rear upper angle screw rod are fixedly connected on the seat frame left rear upper angle screw hole in a penetrating way so that the backrest left vertical rod E1 is hinged with the seat frame B left rear upper end to form movable connection;

the bottom of the backrest right vertical rod E2 is connected with a right lower U-shaped fork E21, and a right vertical rod lower screw hole is transversely formed in the right lower U-shaped fork E21; the right rear upper corner joint of the seat frame B is provided with a right rear upper corner screw hole of the seat frame; the right rear upper corner joint of the seat frame B is inserted into the right lower U-shaped fork E21, so that the backrest frame E is prevented from shaking left and right, and a positioning effect is achieved; the right vertical rod lower screw hole and the seat frame right rear upper angle screw rod are fixedly connected on the seat frame right rear upper angle screw hole in a penetrating way so that the backrest right vertical rod E2 is hinged with the right rear upper part of the seat frame B.

The preferred technical scheme is as follows: the left pedal frame C1 comprises a left L-shaped rod C11, a left calf support cushion C12 and a left pedal plate C13, wherein the middle section of a vertical rod of the left L-shaped rod C11 is connected with the left calf support cushion C12, the left calf support cushion C12 is positioned on the inner side of the left L-shaped rod C11, and a bottom cross rod of the left L-shaped rod C11 is connected with the left pedal plate C13;

the front end of the left foot rest connecting piece G31 is provided with a corresponding screw hole, the middle section of the vertical rod of the left L-shaped rod C11 is provided with a corresponding left screw hole, the screw hole of the left foot rest connecting piece G31 and the left screw hole of the middle section of the vertical rod of the left L-shaped rod C11 are crossed and screwed with screws together so as to ensure that the screw holes are fixedly connected and prevented from falling off, and movable hinged connection is formed;

the left front top of the chair seat frame B is connected with an upper left U-shaped fork B3, the upper left U-shaped fork B3 is transversely provided with a screw hole, the top of a vertical rod of the left L-shaped rod C11 is also transversely provided with a screw hole, a head of the top of the vertical rod of the left L-shaped rod C11 is inserted into the U-shaped fork to prevent left and right shaking, the left L-shaped rod C11 can only turn up and down, and the two screw holes jointly cross the screwing screw to ensure that the screw holes are fixedly connected and prevented from falling off, so that the screw holes form movable hinged connection.

The right pedal frame C2 comprises a right L-shaped rod C21, a right shank support pad C22 and a right pedal plate C23, wherein the middle section of a vertical rod of the right L-shaped rod C21 is connected with the right shank support pad C22, the right shank support pad C22 is positioned at the inner side of the right L-shaped rod C21, and a bottom cross rod of the right L-shaped rod C21 is connected with the right pedal plate C23;

The front end of the right foot rest connecting piece G32 is provided with a corresponding screw hole, the middle section of the vertical rod of the right L-shaped rod C21 is provided with a corresponding left screw hole, the screw hole of the right foot rest connecting piece G32 and the right screw hole of the middle section of the vertical rod of the right L-shaped rod C21 are crossed and screwed with screws together so as to ensure that the screw holes are fixedly connected and prevented from falling off, and movable hinged connection is formed;

the right front top of the chair seat frame B is connected with a right upper U-shaped fork B4, the right upper U-shaped fork B4 is transversely provided with a screw hole, the top of a vertical rod of the right L-shaped rod C21 is also transversely provided with a screw hole, a head of the top of the vertical rod of the right L-shaped rod C21 is inserted into the U-shaped fork to prevent left and right rocking, the right L-shaped rod C21 can only turn up and down, and the two screw holes jointly cross the screwing screw to ensure that the screw holes are fixedly connected and prevented from falling off, so that the screw holes form movable hinged connection.

The preferred technical scheme is as follows: the left side left rear upper corner of the chair seat frame B is hinged with a left armrest frame I, the rear bottom of the left armrest frame I and the left side left rear upper corner of the seat frame are jointly crossed with a screw component, so that the rear bottom of the left armrest frame I and the left side left rear of the chair seat frame B form movable hinge; the left front bottom of the left armrest frame I is connected with a left elastic lock catch I1; a left locking hole B5 is formed in the left front upper part of the left side of the seat frame B; the left armrest frame I can be turned up and down to open and lock the left armrest frame I on the basis of the left upper left rear corner of the chair seat frame B; the left armrest frame I is turned downwards, and the left elastic lock catch I1 falls into the left lock catch hole B5 to realize automatic locking, so that the left armrest frame I is locked and immobilized, and old, weak, sick and disabled people are prevented from falling out from the left side of the wheelchair seat; the left armrest frame I can be unlocked and opened by pressing the left elastic lock catch I1; the left armrest frame I is opened to facilitate the old, weak, sick and disabled people to fall from the left front edge of the wheelchair seat;

The right upper right corner of the seat frame B is hinged with a right armrest frame J, and the rear bottom of the right armrest frame J and the right upper right corner of the seat frame B are jointly crossed with a screw assembly so as to form movable hinge joint between the rear bottom of the right armrest frame J and the right rear right of the seat frame B; the right front bottom of the right armrest frame J is connected with a right elastic lock catch J1; a right locking hole B6 is formed in the right front right part of the right side of the seat frame B; the right armrest frame J can be turned up and down to open and lock the right armrest frame J on the basis of the right rear upper corner of the chair seat frame B; the right armrest frame J is turned downwards, and the right elastic lock catch J1 falls into the right lock catch hole B6 to realize automatic locking, so that the right armrest frame J is locked and immobilized to prevent old, weak, sick and disabled people from falling out from the right side of the wheelchair seat; the right armrest frame J can be unlocked and opened by pressing the right elastic lock catch J1; the right armrest frame J is opened to facilitate the old, weak, sick and disabled people to fall from the right front side of the wheelchair seat.

The preferred technical scheme is as follows: the top of the backrest frame E is connected with a headrest K.

The preferred technical scheme is as follows: the left vertical rod E1 and the cross rod E3 are sleeved with a backrest cushion F.

The preferred technical scheme is as follows: the left side middle part of the chair seat frame B is provided with a left side braking device L, and the left side braking device L is used for performing braking control on the left rear caster A31; the right side middle part of the chair seat frame B is provided with a right side braking device N, and the right side braking device N is used for performing braking control on the right rear caster A41. The left side braking device L and the right side braking device N are products in the prior art.

The specific structure of the product is as follows:

a wheelchair with a linkage adjustment backrest and a foot rest comprises a foot rest wheel device A, a seat frame B, a front foot rest C, a seat cushion D, a backrest frame E, a backrest cushion F and a foot rest linkage adjustment device G;

the backrest frame E is connected with a backrest cushion F; the top of the chair seat frame B is connected with a seat cushion D;

the ground foot wheel device A comprises a left front trundle A1, a right front trundle A2, a left rear trundle A31, a right rear trundle A41, a left transverse hinging piece A321, a left vertical shock absorbing cylinder A322, a right transverse hinging piece A421 and a right vertical shock absorbing cylinder A422; the left front castor A1 and the right front castor A2 are respectively connected to the left front bottom and the right front bottom corresponding to the chair seat frame B; the left transverse hinging piece A321 is transversely arranged, the left vertical shock absorbing cylinder A322 is vertically arranged, one end of the left transverse hinging piece A321 is movably connected with the left rear lower vertical frame piece of the chair seat frame B, the other end of the left transverse hinging piece A321 is movably connected with the telescopic rod end of the left vertical shock absorbing cylinder A322, the cylinder seat of the left vertical shock absorbing cylinder A322 is movably connected with the left rear lower horizontal frame piece of the chair seat frame B, the central transverse axle center of the left rear trundle A31 is transversely and fixedly connected with the left transverse hinging piece A321, and the left rear trundle A31 is arranged on the left outer side of the chair seat frame B; the right transverse hinging piece A421 is transversely arranged, the right vertical shock absorbing cylinder A422 is vertically arranged, one end of the right transverse hinging piece A421 is movably connected with the right rear lower vertical frame piece of the seat frame B, the other end of the right transverse hinging piece A421 is movably connected with the telescopic rod end of the right vertical shock absorbing cylinder A422, the cylinder seat of the right vertical shock absorbing cylinder A422 is movably connected with the right rear lower horizontal frame piece of the seat frame B, the central transverse axle center of the right rear trundle A41 is transversely and fixedly connected with the right transverse hinging piece A421, and the right rear trundle A41 is arranged on the right outer side of the seat frame B;

The backrest frame E comprises a backrest left vertical rod E1, a backrest right vertical rod E2 and a backrest cross rod E3, wherein the left end and the right end of the backrest cross rod E3 are connected with the backrest left vertical rod E1 and the backrest right vertical rod E2 to form the backrest frame E in a fixed connection manner; the bottom of the backrest left vertical rod E1 is connected with a left lower U-shaped fork E11, and a left vertical rod lower screw hole is transversely formed in the left lower U-shaped fork E11; the left rear upper corner joint of the seat frame B is provided with a left rear upper corner screw hole of the seat frame; the left rear upper corner joint of the seat frame B is inserted into the left lower U-shaped fork E11, so that the backrest frame E is prevented from swinging left and right, and a positioning effect is achieved; the left vertical rod lower screw hole and the seat frame left rear upper angle screw rod are fixedly connected on the seat frame left rear upper angle screw hole in a penetrating way so that the backrest left vertical rod E1 is hinged with the left rear part of the seat frame B; the bottom of the backrest right vertical rod E2 is connected with a right lower U-shaped fork E21, and a right vertical rod lower screw hole is transversely formed in the right lower U-shaped fork E21; the right rear upper corner joint of the seat frame B is provided with a right rear upper corner screw hole of the seat frame; the right rear upper corner joint of the seat frame B is inserted into the right lower U-shaped fork E21, so that the backrest frame E is prevented from shaking left and right, and a positioning effect is achieved; the right vertical rod lower screw hole and the seat frame right rear upper angle screw rod are fixedly connected on the seat frame right rear upper angle screw hole in a penetrating way so that the backrest right vertical rod E2 is hinged with the right rear part of the seat frame B;

A backrest overturning angle adjusting and positioning supporting device H is movably connected between the rear middle part of the backrest frame E and the middle lower part of the chair seat frame B; the backrest overturning angle adjusting, positioning and supporting device H comprises a backrest left adjusting hand brake H1, a backrest right adjusting hand brake H3, a backrest left air rod H2 and a backrest right air rod H4, wherein the backrest left air rod H2 and the backrest right air rod H4 are positioned at the left side and the right side of the backrest frame E and are longitudinally arranged; the tops of the backrest left vertical rod E1 and the backrest right air rod H4 are fixedly connected with corresponding backrest left adjusting handbrake H1 and backrest right adjusting handbrake H3 through screw assemblies; the middle part of the left vertical rod E1 of the backrest is movably connected with the top of a telescopic rod of the left air rod H2 of the backrest; the bottom of the base of the backrest left air rod H2 is movably connected with the middle lower part of the left rear side of the seat frame B; the middle part of the backrest right air rod H4 is movably connected with the top of a telescopic rod of the backrest right air rod H4; the bottom of the base of the backrest right air rod H4 is movably connected with the middle lower part of the right rear side of the seat frame B; the backrest left adjusting hand brake H1 is connected with a valve of a backrest left air rod H2 through a left steel wire rope H5; the backrest right adjusting hand brake H3 is connected with a valve of a backrest right air rod H4 through a right steel wire rope H6;

the front foot rest C comprises a left foot rest C1 and a right foot rest C2, and the left foot rest C1 and the right foot rest C2 are respectively and independently arranged; the left pedal frame C1 comprises a left L-shaped rod C11, a left calf support cushion C12 and a left pedal plate C13, wherein the middle section of a vertical rod of the left L-shaped rod C11 is connected with the left calf support cushion C12, the left calf support cushion C12 is positioned on the inner side of the left L-shaped rod C11, and a bottom cross rod of the left L-shaped rod C11 is connected with the left pedal plate C13; the upper part of the left L-shaped rod C11 is hinged with the left front top of the chair seat frame B; the right pedal frame C2 comprises a right L-shaped rod C21, a right shank support pad C22 and a right pedal plate C23, wherein the middle section of a vertical rod of the right L-shaped rod C21 is connected with the right shank support pad C22, the right shank support pad C22 is positioned at the inner side of the right L-shaped rod C21, and a bottom cross rod of the right L-shaped rod C21 is connected with the right pedal plate C23; the upper part of the right L-shaped rod C21 is hinged with the right front top of the chair seat frame B;

The left side left rear upper corner of the chair seat frame B is hinged with a left armrest frame I, and the left front bottom of the left armrest frame I is connected with a left elastic lock catch I1; a left locking hole B5 is formed in the left front upper part of the left side of the seat frame B; the left armrest frame I can be turned up and down to open and lock the left armrest frame I on the basis of the left upper left rear corner of the chair seat frame B; the left armrest frame I is turned downwards, the left elastic lock catch I1 falls into the left lock catch hole B5 to realize automatic locking, and the left armrest frame I can be unlocked and opened by pressing the left elastic lock catch I1; the right upper rear corner of the right side of the chair seat frame B is hinged with a right armrest frame J, and the right front bottom of the right armrest frame J is connected with a right elastic lock catch J1; a right locking hole B6 is formed in the right front right part of the right side of the seat frame B; the right armrest frame J can be turned up and down to open and lock the right armrest frame J on the basis of the right rear upper corner of the chair seat frame B; the right armrest frame J is turned downwards, the right elastic lock catch J1 falls into the right lock catch hole B6 to realize automatic locking, and the right armrest frame J can be unlocked and opened by pressing the right elastic lock catch J1;

the foot rest linkage adjusting device G comprises a left rear inclined connecting piece G11, a left rear bending connecting piece G12, a right rear inclined connecting piece G13, a right rear bending connecting piece G14, a left transverse driving piece G21, a left transverse driving rod G22, a right transverse driving piece G23, a right transverse driving rod G24, a left foot rest connecting piece G31 and a right foot rest connecting piece G32; the upper end of the left rear inclined connecting piece G11 is hinged with the lower section of the left vertical rod E1 of the backrest, the lower end of the left rear inclined connecting piece G11 is hinged with the upper end of the left rear bending connecting piece G12, the lower end of the left rear bending connecting piece G12 is hinged with the rear end of the left transverse driving piece G21, the front end of the left transverse driving piece G21 is fixedly connected with the rear end of the left transverse driving rod G22, and the front end of the left transverse driving rod G22 is hinged with the rear end of the left foot rest connecting piece G31; the upper end of the right rear inclined connecting piece G13 is hinged with the lower section of the right vertical rod E2 of the backrest, the lower end of the right rear inclined connecting piece G13 is hinged with the upper end of the right rear bending connecting piece G14, the lower end of the right rear bending connecting piece G14 is hinged with the rear end of the right transverse driving piece G23, the front end of the right transverse driving piece G23 is fixedly connected with the rear end of the right transverse driving rod G24, and the front end of the right transverse driving rod G24 is hinged with the rear end of the right foot rest connecting piece G32; the front end of the left foot rest connecting piece G31 is hinged with the middle part of the left L-shaped rod C11; the front end of the right foot rest connecting piece G32 is hinged with the middle part of the right L-shaped rod C21. A left rod penetrating hole B1 is formed in the left side of the seat frame B, and a left transverse driving rod G22 movably penetrates through the right rod penetrating hole B2; right rod penetrating holes B2 are formed in the right side of the seat frame B, and right transverse driving rods G24 movably penetrate through the right rod penetrating holes B2.

Claims (10)

1. A wheelchair with a linkage adjustment backrest and a foot rest comprises a foot drop wheel device, a seat frame, a front foot rest, a seat cushion, a backrest frame and a backrest cushion; the backrest frame is connected with a backrest cushion; the ground wheel device is connected to the lower part of the chair seat frame; the ground wheel device is used for enabling the wheelchair to move in a rolling manner; the top of the chair seat frame is connected with a seat cushion; the lower part of the backrest frame is hinged with the rear part of the chair seat frame; the method is characterized in that: the device also comprises a foot rest linkage adjusting device;

the upper part of the front foot rest is hinged with the front top of the chair seat frame;

the lower section of the backrest frame is hinged with one end of the foot rest linkage adjusting device, and the other end of the foot rest linkage adjusting device is hinged with the middle part of the front foot rest; the foot rest linkage adjusting device passes through or is arranged at one side of the seat frame;

when the backrest frame is adjusted in a anticlockwise backward overturning manner, the backrest frame synchronously drives the foot rest linkage adjusting device to push the front foot rest forward so as to upwards overturn and lift the front foot rest anticlockwise and adjust the inclination angle of the front foot rest in a follow-up manner;

when the backrest frame is turned forwards clockwise, the backrest frame synchronously drives the foot rest linkage adjusting device to pull the front foot rest backwards so as to turn downwards clockwise to lower the front foot rest and adjust the inclination angle of the front foot rest in a follow-up manner.

2. A wheelchair with a linkage adjusting backrest and foot rest according to claim 1, characterized in that: the foot rest linkage adjusting device comprises a rear section crank power transmission device, a middle section transverse power synchronous transmission device and a front section power synchronous transmission device, wherein the upper part of the rear section crank power transmission device is hinged with the lower section of the backrest frame, the lower part of the rear section crank power transmission device is hinged with the rear part of the middle section transverse power synchronous transmission device, the front part of the middle section transverse power synchronous transmission device is hinged with the rear part of the front section power synchronous transmission device, and the front part of the front section power synchronous transmission device is hinged with the middle part of the front foot rest.

3. A wheelchair with a linkage adjusting backrest and foot rest according to claim 2, characterized in that: the rear section bent sheet power transmission device comprises a left rear inclined connecting sheet, a left rear bent connecting sheet, a right rear inclined connecting sheet and a right rear bent connecting sheet;

the middle section transverse power synchronous transmission device comprises a left transverse driving piece, a left transverse driving rod, a right transverse driving piece and a right transverse driving rod;

the front section power synchronous transmission device comprises a left foot rest connecting piece and a right foot rest connecting piece;

The upper end of the left rear inclined connecting piece is hinged with the left rear side of the lower section of the backrest frame, the lower end of the left rear inclined connecting piece is hinged with the upper end of the left rear curved connecting piece, the lower end of the left rear curved connecting piece is hinged with the rear end of the left transverse driving piece, the front end of the left transverse driving piece is fixedly connected with the rear end of the left transverse driving rod, and the front end of the left transverse driving rod is hinged with the rear end of the left foot rest connecting piece;

the upper end of the right rear inclined connecting piece is hinged with the right rear side of the lower section of the backrest frame, the lower end of the right rear inclined connecting piece is hinged with the upper end of the right rear curved connecting piece, the lower end of the right rear curved connecting piece is hinged with the rear end of the right transverse driving piece, the front end of the right transverse driving piece is fixedly connected with the rear end of the right transverse driving rod, and the front end of the right transverse driving rod is hinged with the rear end of the right foot rest connecting piece;

the front ends of the left foot rest connecting piece and the right foot rest connecting piece are hinged with the middle part of the front foot rest.

4. A wheelchair with a linkage adjusting backrest and foot rest according to claim 3, characterized in that: the front foot rest comprises a left foot rest and a right foot rest, and the left foot rest and the right foot rest are respectively and independently arranged;

The upper part of the left pedal frame is hinged with the left front top of the chair seat frame; the upper part of the right pedal frame is hinged with the right front top of the chair seat frame;

the front end of the left foot rest connecting piece is hinged with the middle part of the left foot rest;

the front end of the right foot rest connecting piece is hinged with the middle part of the right foot rest.

5. A wheelchair with a linkage adjusting backrest and foot rest according to claim 3, characterized in that: the left side of the chair seat frame is provided with a left rod penetrating hole, and the left transverse driving rod movably penetrates through the left rod penetrating hole; the right side of the chair seat frame is provided with a right rod penetrating hole, and the right transverse driving rod movably penetrates through the right rod penetrating hole.

6. A wheelchair with a linkage adjusting backrest and foot rest according to claim 1, characterized in that: the foot falling wheel device comprises a left front castor, a right front castor, a left rear castor device and a right rear castor device, and the left front castor and the right front castor are respectively connected to the left front bottom and the right front bottom corresponding to the chair seat frame; the left rear caster device and the right rear caster device are respectively connected to the left rear lower part and the right rear lower part corresponding to the chair seat frame.

7. The wheelchair with a linkage adjustment backrest and a foot rest according to claim 6, wherein: the left rear trundle device comprises a left rear trundle and a left rear shock absorbing device, the left rear trundle is movably connected with the left rear shock absorbing device, and the left rear shock absorbing device is connected with the left rear lower part corresponding to the seat frame; the right rear truckle device comprises a right rear truckle and a right rear shock-absorbing device, the right rear truckle is movably connected with the right rear shock-absorbing device, and the right rear shock-absorbing device is connected with the right rear lower part corresponding to the seat frame.

8. The wheelchair with a linkage adjustment backrest and foot rest of claim 7, wherein: the left rear shock absorber comprises a left transverse hinge piece and a left vertical shock absorbing cylinder, wherein the left transverse hinge piece is transversely arranged, the left vertical shock absorbing cylinder is vertically arranged, one end of the left transverse hinge piece is movably connected with the left rear lower part of the seat frame, the other end of the left transverse hinge piece is movably connected with the telescopic rod end of the left vertical shock absorbing cylinder, the cylinder seat of the left vertical shock absorbing cylinder is movably connected with the left rear lower part of the seat frame, the central transverse axle center of the left rear trundle is transversely and fixedly connected with the left transverse hinge piece, and the left rear trundle is arranged on the left outer side of the seat frame;

the right rear shock absorber comprises a right transverse hinge piece and a right vertical shock absorbing cylinder, wherein the right transverse hinge piece is transversely arranged, the right vertical shock absorbing cylinder is vertically arranged, one end of the right transverse hinge piece is movably connected with the right rear lower portion of the seat frame, the other end of the right transverse hinge piece is movably connected with the telescopic rod end of the right vertical shock absorbing cylinder, the cylinder seat of the right vertical shock absorbing cylinder is movably connected with the right rear lower portion of the seat frame, the center transverse axis of the right rear truckle is transversely fixedly connected with the right transverse hinge piece, and the right rear truckle is arranged on the right outer side of the seat frame.

9. A wheelchair with a linkage adjusting backrest and foot rest according to claim 1, characterized in that: the backrest overturning angle adjusting, positioning and supporting device is movably connected between the rear middle part of the backrest frame and the middle lower part of the chair seat frame.

10. A wheelchair having a linkage adjusting backrest and foot rest according to claim 9, wherein: the backrest overturning angle adjusting, positioning and supporting device comprises a backrest left adjusting hand brake, a backrest right adjusting hand brake, a backrest left air rod and a backrest right air rod, wherein the backrest left air rod and the backrest right air rod are positioned at the left side and the right side of a backrest frame and are longitudinally arranged;

the rear middle part of the left side of the backrest frame is movably connected with the top of the telescopic rod of the left backrest air rod, and the bottom of the base of the left backrest air rod is movably connected with the middle lower part of the left rear side of the seat frame;

the rear middle part of the right side of the backrest frame is movably connected with the top of the telescopic rod of the right backrest air rod, and the bottom of the base of the right backrest air rod is movably connected with the middle lower part of the right rear side of the seat frame;

the left backrest adjusting hand brake is connected with a valve of a left backrest air rod through a left steel wire rope; the backrest right adjusting hand brake is connected with a valve of a backrest right air rod through a right steel wire rope.