Rear wheel damping device of wheelchair

Abstract

The utility model discloses a rear wheel damping device of a wheelchair, which is characterized in that the middle of a left rear large wheel is movably connected with a left shaft core in a penetrating manner, and the middle of a right rear large wheel is movably connected with a right shaft core in a penetrating manner; the left inverted L-shaped vertical rod is integrally formed; the right inverted-L-shaped vertical rod is integrally formed; the left air rod and the right air rod are longitudinally arranged and located behind the corresponding left vertical rod and the corresponding right vertical rod. The inner section of the left shaft core is fixedly connected with a left movable component, the front end of the left movable component is movably connected to the middle section of the left vertical rod, the rear end of the left movable component is movably connected to the top of a telescopic rod of a left air rod, the bottom of a rod base of the left air rod is movably connected to a left rod base, and the left rod base is fixedly connected to a left rear bottom cross rod; the inner section of the right shaft core is fixedly connected with a right movable component, the front end of the right movable component is movably connected to the middle section of the right vertical rod, the rear end of the right movable component is movably connected to the top of a telescopic rod of a right air rod, the bottom of a rod base of the right air rod is movably connected to a right rod base, and the right rod base is fixedly connected to a right rear bottom transverse rod. The product is high in production efficiency, and the damping effect is good by adopting the left air rod and the right air rod.

Description

Technical Field

[0001] The utility model relates to a wheelchair caster shock absorbing component, in particular to a rear wheel shock absorbing device of the wheelchair. Background Art

[0002] For example 1: Chinese patent document announcement number: CN220714194U, discloses a folding wheelchair that is easy to transport, including a frame, driving wheels and a pedal assembly, wherein the left and right sides of the frame are rotatably connected to driving wheels, the frame includes a front bracket, and the pedal assembly is arranged on the front bracket; the pedal assembly includes a foot frame, a foot pedal, a first clamping arm, a first clamping member, a second clamping arm and a self-locking plate, the lower end of the foot frame is connected to the foot pedal, the first clamping arm and the second clamping arm are both connected to the upper end of the foot frame; one end of the first clamping member is connected to the first One end of the clamping arm away from the tripod is rotatably connected, and one end of the first clamping member is detachably connected to one end of the first clamping arm, and the other end of the first clamping member is fixed to the front bracket; one end of the second clamping arm away from the tripod is in contact with the front bracket, one end of the self-locking plate is rotatably connected to the second clamping arm, and the position where the self-locking plate is set and the position where the first clamping member is set are distributed on the left and right sides of the front bracket, a spring is provided between the self-locking plate and the second clamping arm, and the self-locking plate is pressed against the front bracket by the elastic force of the spring. One end of the first clamping member is provided with a connecting shaft perpendicular to the first clamping member itself, and one end of the first clamping arm is sleeved on the connecting shaft. The frame further includes a first I-beam and a second I-beam, the first I-beam and the second I-beam are arranged crosswise, and the middle part of the first I-beam is hinged with the middle part of the second I-beam, the left side of the first I-beam and the left side of the second I-beam are connected to the same front bracket, and the right side of the first I-beam and the right side of the second I-beam are connected to the same front bracket. The frame further includes a backrest support rod, which is arranged at the rear side of the first I-beam and / or the second I-beam, the left side of the first I-beam and the left side of the second I-beam are connected to the same backrest support rod, and the right side of the first I-beam and the right side of the second I-beam are connected to the same backrest support rod. The frame also includes a handle assembly, which is arranged at the upper end of the backrest support rod; the handle assembly includes a lower folding piece, an upper folding piece, a folding handle and a bayonet, the lower end of the lower folding piece is fixedly connected to the upper end of the backrest support rod, the upper folding piece is hinged to the lower folding piece, the lower end of the folding handle is fixedly connected to the upper folding piece, and the bayonet passes through the upper folding piece, the lower end of the folding handle and the lower folding piece in sequence. The folding wheelchair also includes a universal guide wheel, which is fixedly connected to the lower end of the front bracket. The folding wheelchair also includes a seat cushion and a back cushion, and the seat cushion and the back cushion are both arranged on the frame.

[0003] The above-mentioned products are of the same type of structure. There is no shock-absorbing function for the rear large casters at the rear of the left and right frames. The solid rubber tires are used as shock absorbers, and the shock-absorbing effect is not good. Secondly, the left and right frames are fixed by adjacent welding of longitudinal bars and transverse bars, and the production efficiency is low.

[0004] For example 2: Chinese patent document publication number: CN117257566A discloses a portable folding wheelchair, comprising a left frame (1) and a right frame (2), wherein a footrest frame (5), a seat folding frame (6), a wheelchair armrest (7) and an auxiliary wheel assembly (8) are arranged in sequence from front to back between the left frame (1) and the right frame (2), wherein a seat cushion (9) is detachably placed on the seat folding frame (6), and the outer sides of the left frame (1) and the right frame (2) are rotatable. The pedal frame (5) is rotatably connected to a front guide wheel (3) and a moving wheel (4) arranged front and rear, and the pedal frame (5) comprises a left detachable foot connecting rod group (51), a right detachable foot connecting rod group (52) and a foot pedal (53); a detachable foot connecting block (531) is arranged at the bottom of the foot pedal (53); one end of the left detachable foot connecting rod group (51) is rotatably hinged to one side of the detachable foot connecting block (531), and the other end is rotatably hinged to the left frame (1); one end of the right detachable foot connecting rod group (52) is rotatably hinged to the detachable foot connecting block (531). The other side and the other end of the connecting block (531) are rotatably hinged on the right frame (2); the wheelchair armrest (7) comprises a handrail rod (71) horizontally arranged on both sides of the seat folding frame (6) and a support rod (72) connected to the rear end of the handrail rod (71); the lower end of the support rod (72) is rotatably hinged on the left frame (1) and the right frame (2); the wheelchair armrest (7) can be flipped backwards along the hinge point as the central axis so that the handrail rod (71) avoids the lateral movement of the left and right sides of the sitting position. The auxiliary wheel assembly (8) comprises an anti-roll tube mounting seat (81) and an auxiliary wheel tube (82), wherein the anti-roll tube mounting seat (81) is fixedly connected to the left frame (1) or the right frame (2), the inner end of the auxiliary wheel tube (82) is rotatably connected to the anti-roll tube mounting seat (81), and the outer end of the auxiliary wheel tube (82) is rotatably connected to an auxiliary wheel (83), and the auxiliary wheel (83) rotates inward along with the auxiliary wheel tube (82) and is folded below the seat folding frame (6).

[0005] The above-mentioned products are of the same type of structure. There is no shock-absorbing function for the rear large casters at the rear of the left frame and the right frame. The solid rubber tires are used as shock absorbers, and the shock-absorbing effect is not good. Secondly, the left frame and the right frame are fixed by adjacent welding of longitudinal bars and transverse bars, and the production efficiency is low. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a rear wheel shock absorbing device for a wheelchair which has reasonable structural design, good shock absorbing effect, energy-saving production cost and high production efficiency.

[0007] The solutions to the above technical problems are:

[0008] A rear wheel shock absorbing device for a wheelchair comprises a left rear large wheel and a right rear large wheel, wherein the middle of the left rear large wheel is movably connected with a left axle core, and the middle of the right rear large wheel is movably connected with a right axle core, and further comprises a left movable member, a left inverted L-shaped vertical rod, a left gas rod, a left rod base, a right movable member, a right inverted L-shaped vertical rod, a right gas rod, and a right rod base, wherein the left inverted L-shaped vertical rod is integrally formed, comprising a left vertical rod and a left rear bottom cross rod; the right inverted L-shaped vertical rod is integrally formed, comprising a right vertical rod and a right rear bottom cross rod; the left gas rod and the right gas rod are longitudinally arranged and located behind the corresponding left vertical rod and right vertical rod; The inner section of the left shaft core is fixedly connected to the left movable component, and the front end of the left movable component is movably connected to the middle section of the left vertical rod; the rear end of the left movable component is movably connected to the top of the telescopic rod of the left gas rod, and the bottom of the rod seat of the left gas rod is movably connected to the left rod base, and the left rod base is fixedly connected to the left rear bottom cross bar; the inner section of the right shaft core is fixedly connected to the right movable component, and the front end of the right movable component is movably connected to the middle section of the right vertical rod; the rear end of the right movable component is movably connected to the top of the telescopic rod of the right gas rod, and the bottom of the rod seat of the right gas rod is movably connected to the right rod base, and the right rod base is fixedly connected to the right rear bottom cross bar.

[0009] The beneficial effects of the rear wheel shock absorbing device of a wheelchair of the utility model are as follows: 1. The left inverted L-shaped vertical rod and the right inverted L-shaped vertical rod of the product are integrally formed, which has high production efficiency, saves production costs, has no welding points, is more beautiful in one piece, and has better structural stress resistance; 2. The left gas rod and the right gas rod adopted by the product have a certain length, a small diameter, and longitudinal shock absorption, which is more suitable for use with the left rear large wheel and the right rear large wheel of a large-size wheelchair to enhance the shock absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 , Figure 2 , Figure 3 This is a three-dimensional diagram of the utility model product with an X-shaped seat frame;

[0011] Figure 4 , Figure 5 This is a three-dimensional diagram of the utility model product without the X-shaped seat frame;

[0012] Figure 6 This is a three-dimensional diagram of the left side frame of the wheelchair of the utility model;

[0013] Figure 7 This is a three-dimensional diagram of the right side frame of the wheelchair of the utility model;

[0014] Figure 8 , Fig. 9 This is a disassembled diagram of the utility model product;

[0015] Fig.10It is a stereoscopic diagram of the left rear large wheel, the left movable component, the left reverse L-shaped vertical rod, and the left gas rod of the utility model product;

[0016] Fig.11 It is a stereoscopic diagram of the right rear large wheel, the right movable component, the right inverted L-shaped vertical rod and the right gas rod of the utility model product.

[0017] Left rear big wheel A, left axle core A1, left movable component A2, left front fork A21, left rear fork A22, left reverse L-shaped vertical rod A3, left vertical rod A31, left rear bottom cross bar A32, left locking pin hole A33, left gas rod A4, left rod base A5, left rear wheel foot rod A6, left elastic locking pin A61, left rear anti-dumping small caster A7, left upper side rod A8, left lower side rod A9, left front vertical rod A10, left front caster A11, right rear Big wheel B, right axle core B1, right movable component B2, right front fork B21, right rear fork B22, right inverted L-shaped vertical rod B3, right vertical rod B31, right rear bottom cross rod B32, right locking pin hole B33, right gas rod B4, right rod base B5, right rear wheel foot rod B6, right elastic locking pin B61, right rear anti-dump caster B7, right upper side rod B8, right lower side rod B9, right front vertical rod B10, right front caster B11, X-shaped seat frame 1. DETAILED DESCRIPTION

[0018] like Figures 1 to 11 The rear wheel shock absorbing device of the wheelchair comprises a left rear large wheel A and a right rear large wheel B. The left rear large wheel A is movably connected in the middle with a left shaft core A1, which is made of stainless steel and is fixedly connected to the outer end of the left shaft core A1 through a nut assembly to prevent it from falling off; the right rear large wheel B is movably connected in the middle with a right shaft core B1, which is made of stainless steel and is fixedly connected to the outer end of the right shaft core B1 through a nut assembly to prevent it from falling off; the rear wheel shock absorbing device of the wheelchair also comprises a left Active component A2, left reverse L-shaped vertical rod A3, left gas rod A4, left rod base A5, right active component B2, right reverse L-shaped vertical rod B3, right gas rod B4, right rod base B5; Since the diameter of the left rear large wheel A and the right rear large wheel B is relatively large, the radius of the left rear large wheel A and the right rear large wheel B is large, and the support and shock absorption radius is large, it is necessary to use a longer left gas rod A4 and right gas rod B4; The height of the left reverse L-shaped vertical rod A3 and the right reverse L-shaped vertical rod B3 is 50 cm to 80 cm;

[0019] The left inverted L-shaped vertical rod A3 is integrally formed, including a left vertical rod A31 and a left rear bottom cross rod A32, and the bottom end of the left vertical rod A31 is integrally extended backward to connect with the left rear bottom cross rod A32; the left inverted L-shaped vertical rod A3 is integrally processed and bent by a metal pipe bending machine, which has high production efficiency, saves production costs, has no welding points, and is more beautiful in one piece, and has better structural stress resistance;

[0020] The right inverted L-shaped vertical rod B3 is integrally formed, including a right vertical rod B31 and a right rear bottom cross rod B32, and is integrally extended from the bottom end of the right vertical rod B31 to the rear to connect with the right rear bottom cross rod B32; the right inverted L-shaped vertical rod B3 is integrally processed and bent by a metal pipe bending machine, which has high production efficiency, saves production costs, has no welding points, and is more beautiful in one piece, and has better structural stress resistance;

[0021] The height of the left gas rod A4 and the right gas rod B4 is 30 cm to 50 cm; the left gas rod A4 and the right gas rod B4 are used for wheelchair pushing and shock absorption, and play a shock absorption role; since people sitting in wheelchairs generally weigh 40 kg to 75 kg, they have a certain weight, and it is most appropriate to select a gas rod or a cylinder at the rear of the wheelchair; the left gas rod A4 and the right gas rod B4 are arranged longitudinally and are located behind the corresponding left vertical rod A31 and right vertical rod B31; the left gas rod A4 and the right gas rod B4 have a certain length, a small diameter, and longitudinal shock absorption, and are more suitable for the left rear large wheel A and the right rear large wheel B of a large-sized wheelchair;

[0022] The inner section of the left shaft core A1 is fixedly connected to the left movable component A2, and the front end of the left movable component A2 is movably connected to the middle section of the left vertical rod A31; the rear end of the left movable component A2 is movably connected to the top of the telescopic rod of the left gas rod A4, and the bottom of the rod seat of the left gas rod A4 is movably connected to the left rod base A5, and the left rod base A5 is welded and fixedly connected to the left rear bottom cross bar A32; the left rod base A5 and the left rear bottom cross bar A32 are made of the same material; when the wheelchair encounters uneven, pothole-like, rugged and other road conditions during pushing, the vibration wave of the left rear large wheel A is transmitted to the left movable component A2 through the left shaft core A1. The left movable component A2 transmits the shock wave to the left gas rod A4, and the left gas rod A4 compresses the internal air pressure through its telescopic rod to achieve buffering and shock absorption. The left movable component A2 will float up and down as the telescopic rod of the left gas rod A4 stretches up and down. Therefore, the front end of the left movable component A2 should be movably connected to the middle section of the left vertical rod A31, the rear end of the left movable component A2 should be movably connected to the top of the telescopic rod of the left gas rod A4, and the bottom of the rod seat of the left gas rod A4 should be movably connected to the left rod base A5 to prevent hard contact between the above components, so that elastic buffering and shock absorption can be achieved, and the shock absorption efficiency of this structure is good;

[0023] The inner section of the right shaft core B1 is fixedly connected to the right movable member B2, and the front end of the right movable member B2 is movably connected to the middle section of the right vertical rod B31; the rear end of the right movable member B2 is movably connected to the top of the telescopic rod of the right gas rod B4, and the bottom of the rod seat of the right gas rod B4 is movably connected to the right rod base B5, and the right rod base B5 is welded and fixedly connected to the right rear bottom cross bar B32; the right rod base B5 and the right rear bottom cross bar B32 are made of the same material; when the wheelchair encounters uneven, pothole-like, rugged and other road conditions during pushing, the vibration wave of the right rear large wheel B is transmitted to the right movable member through the right shaft core B1 The right movable component B2 transmits the shock wave to the right gas rod B4, and the right gas rod B4 compresses the internal air pressure through its telescopic rod to achieve buffering and shock absorption. The right movable component B2 will float up and down as the telescopic rod of the right gas rod B4 extends and retracts. Therefore, the front end of the right movable component B2 should be movably connected to the middle section of the right vertical rod B31, the rear end of the right movable component B2 should be movably connected to the top of the telescopic rod of the right gas rod B4, and the bottom of the rod seat of the right gas rod B4 should be movably connected to the right rod base B5 to prevent hard contact between the above components, so that elastic buffering and shock absorption can be achieved, and the shock absorption efficiency of this structure is good;

[0024] The preferred technical solution is further improved as follows: the left rear bottom cross bar A32 is connected to the left rear wheel foot rod A6, and the rear end of the left rear wheel foot rod A6 is fixedly connected to the left rear anti-dumping small caster A7; the right rear bottom cross bar B32 is connected to the right rear wheel foot rod B6, and the rear end of the right rear wheel foot rod B6 is fixedly connected to the right rear anti-dumping small caster B7. When the wheelchair is pushed on a sloped road (for example: a road slope of 10 degrees to 30 degrees), the person sitting in the wheelchair will lean back a little, and the person's center of gravity will be transferred to the backrest at the back. With the left rear anti-dumping small caster A7 and the right rear anti-dumping small caster B7, when the person sitting in the wheelchair is pushed on the sloped road, the wheelchair will not tip over, and the left and right double supports ensure the safety of the person sitting in the wheelchair.

[0025] Further preferred technical solution: the left vertical rod A31 and the left rear bottom cross bar A32 are formed by bending a metal tube in one piece; a left locking pin hole A33 is provided at the top of the left rear bottom cross bar A32; a left elastic locking pin A61 is connected to the front section of the left rear wheel foot rod A6, and the front section of the left rear wheel foot rod A6 is inserted from the rear end tube hole of the left rear bottom cross bar A32, and the left elastic locking pin A61 falls into the left locking pin hole A33 for locking connection; when the left elastic locking pin A61 is pressed and withdrawn from the left locking pin hole A33, it can be pulled out by force The left rear wheel foot rod A6 is easy to disassemble; the left rear bottom cross bar A32 and the left rear wheel foot rod A6 are detachably connected through the left elastic locking pin A61 and the left locking pin hole A33; the left rear anti-dumping caster A7 is small and subjected to large forces, and is also a component with large mechanical wear and consumption. After a few months to a year of use, it may become a little loose, or be broken by excessive use by some users, and the detachable connection is convenient for replacement; furthermore, it can be used at home and in a flat place, or it can be disassembled and not used.

[0026] Further preferred technical solution: the right vertical rod B31 and the right rear bottom cross bar B32 are formed by bending a metal tube in one piece; a right locking pin hole B33 is provided at the top of the right rear bottom cross bar B32; a right elastic locking pin B61 is connected to the front section of the right rear wheel foot rod B6, and the front section of the right rear wheel foot rod B6 is inserted from the rear end tube hole of the right rear bottom cross bar B32, and the right elastic locking pin B61 falls into the right locking pin hole B33 for locking connection; when the right elastic locking pin B61 is pressed and retreated to the right locking pin hole B33, it can be pulled out by force The right rear wheel foot rod B6 is easy to disassemble; the right rear bottom cross bar B32 and the right rear wheel foot rod B6 are matched to form a detachable connection through the right elastic locking pin B61 and the right locking pin hole B33; the right rear anti-dumping caster B7 is small and subjected to large forces, and is also a component with large mechanical wear and consumption. After a few months to a year of use, it may become a little loose, or be broken by some users due to excessive use. The detachable connection makes it easy to replace; furthermore, it can be used at home or in a flat place, or it can be disassembled and not used.

[0027] Further preferred technical solution: the left movable component A2 is integrally formed by die-casting with an aluminum casting machine, which has high production efficiency, low cost and light weight; the left movable component A2 includes a left front fork A21 and a left rear fork A22, and the left front fork A21 and the left rear fork A22 are both U-shaped, so that clamping ears are formed on the left and right sides; the top of the telescopic rod of the left gas rod A4 is inserted into the left rear fork A22 to prevent left and right deviations, so that it is set in the center, so that the up and down lifting shock absorption and buffering effect is better, and the left rear The screw assembly crosses the rear of the left movable component A2 and the top of the telescopic rod of the left gas rod A4 to form a movable connection, which is fixed and prevented from falling off by screwing the left rear screw assembly; the middle section of the left vertical rod A31 is inserted into the left front fork A21 to prevent it from deviating to the left and right, so that it is set in the center, and the left front screw assembly is used to cross the front of the left movable component A2 and the middle section of the left vertical rod A31 to form a movable connection, which is fixed and prevented from falling off by screwing the left front screw assembly; the inner section of the left shaft core A1 crosses the middle section of the left movable component A2 and is fixed and connected with a nut assembly to prevent falling off.

[0028] The above-mentioned left movable component A2 is movably connected with the top of the telescopic rod of the left gas rod A4 and the middle section of the left vertical rod A31, with stable anti-slip ability and good up and down movable performance;

[0029] Further preferred technical solution: the right movable component B2 is integrally formed, and is integrally die-casted by an aluminum casting machine, which has high production efficiency, low cost and light weight; the right movable component B2 includes a right front fork B21 and a right rear fork B22, and the right front fork B21 and the right rear fork B22 are both U-shaped, so that clamping ears are formed on the left and right sides; the top of the telescopic rod of the right gas rod B4 is inserted into the right rear fork B22 to prevent left and right deviations, so that it is set in the center, so that the up and down lifting shock absorption and buffering effect is better, and the right The rear screw assembly crosses the rear of the right movable component B2 and the top of the telescopic rod of the right gas rod B4 to form a movable connection, which is fixed and prevented from falling off by screwing through the left rear screw assembly; the middle section of the right vertical rod B31 is inserted into the right front fork B21 to prevent it from deviating to the left or right, so that it is set in the center, and the right front screw assembly is used to cross the front of the right movable component B2 and the middle section of the right vertical rod B31 to form a movable connection, which is fixed and prevented from falling off by screwing through the left front screw assembly; the inner section of the right shaft core B1 crosses the right movable component B2 and is fixed and connected with a nut assembly to prevent falling off.

[0030] The above-mentioned right movable component B2 is movably connected with the top of the telescopic rod of the right gas rod B4 and the middle section of the right vertical rod B31, with stable anti-slip ability and good up and down movable performance;

[0031] Further preferred technical solution: the upper section of the left vertical rod A31 is welded forward and fixedly connected to the left upper side rod A8; the bottom section of the left vertical rod A31 is welded forward and fixedly connected to the left lower side rod A9; the front ends of the left upper side rod A8 and the left lower side rod A9 are welded and fixedly connected to the left front vertical rod A10; the left reverse L-shaped vertical rod A3, the left upper side rod A8, the left lower side rod A9, and the left front vertical rod A10 form the left side frame of the wheelchair; all are made of aluminum;

[0032] The upper section of the right vertical rod B31 is welded forward and fixedly connected to the right upper side rod B8; the lower section of the right vertical rod B31 is welded forward and fixedly connected to the right lower side rod B9; the front ends of the right upper side rod B8 and the right lower side rod B9 are welded and fixedly connected to the right front vertical rod B10. The right reverse L-shaped vertical rod B3, the right upper side rod B8, the right lower side rod B9, and the right front vertical rod B10 form the right side frame of the wheelchair; all are made of aluminum;

[0033] Further preferred technical solution: an X-shaped seat frame 1 is hinged between the left lower side rod A9 and the right lower side rod B9; the seat frame can be folded conveniently, and the left side frame and the right side frame of the wheelchair can be folded conveniently.

[0034] Further preferred technical solution: the bottom of the left front vertical rod A10 is connected to the left front caster A11; the bottom of the right front vertical rod B10 is connected to the right front caster B11.

[0035] Further improvement of the preferred technical solution: the left inverted L-shaped vertical rod A3 and the right inverted L-shaped vertical rod B3 are made of aluminum tubes, which are more universal and light in weight.

Claims

1. A rear wheel shock absorbing device for a wheelchair, comprising a left rear large wheel and a right rear large wheel, wherein the middle of the left rear large wheel is movably connected with a left axle core, and the middle of the right rear large wheel is movably connected with a right axle core, characterized in that: It also includes a left movable component, a left inverted L-shaped vertical rod, a left gas rod, a left rod base, a right movable component, a right inverted L-shaped vertical rod, a right gas rod, and a right rod base. The left reverse L-shaped vertical rod is integrally formed and includes a left vertical rod and a left rear bottom cross rod; The right inverted L-shaped vertical bar is integrally formed and includes a right vertical bar and a right rear bottom cross bar; The left gas rod and the right gas rod are arranged longitudinally and are located behind the corresponding left vertical rod and right vertical rod; The inner section of the left shaft core is fixedly connected to the left movable member, and the front end of the left movable member is movably connected to the middle section of the left vertical rod; The rear end of the left movable component is movably connected to the top of the telescopic rod of the left gas rod, the bottom of the rod seat of the left gas rod is movably connected to the left rod base, and the left rod base is fixedly connected to the left rear bottom cross bar; The inner section of the right shaft core is fixedly connected to the right movable member, and the front end of the right movable member is movably connected to the middle section of the right vertical rod; The rear end of the right movable component is movably connected to the top of the telescopic rod of the right gas rod, the bottom of the rod seat of the right gas rod is movably connected to the right rod base, and the right rod base is fixedly connected to the right rear bottom cross bar.

2. The rear wheel shock absorbing device of a wheelchair according to claim 1, characterized in that: The left rear bottom cross bar is connected to a left rear wheel foot rod, and the rear end of the left rear wheel foot rod is fixedly connected to a left rear anti-dumping caster; The right rear bottom cross bar is connected to a right rear wheel foot rod backwards, and the rear end of the right rear wheel foot rod is fixedly connected to a right rear anti-dumping small caster.

3. The rear wheel shock absorbing device of a wheelchair according to claim 2, characterized in that: The left vertical rod and the left rear bottom cross rod are integrally bent and formed by metal pipes; a left locking pin hole is opened at the top of the left rear bottom cross rod; the front section of the left rear wheel foot rod is connected with a left elastic locking pin, the front section of the left rear wheel foot rod is inserted from the rear end tube hole of the left rear bottom cross rod, and the left elastic locking pin falls into the left locking pin hole for locking connection; the left rear bottom cross rod and the left rear wheel foot rod are detachably connected through the left elastic locking pin and the left locking pin hole.

4. The rear wheel shock absorbing device of a wheelchair according to claim 2, characterized in that: The right vertical rod and the right rear bottom cross rod are integrally bent and formed with a metal tube; a right locking pin hole is opened at the top of the right rear bottom cross rod; the front section of the right rear wheel foot rod is connected with a right elastic locking pin, the front section of the right rear wheel foot rod is inserted from the rear end tube hole of the right rear bottom cross rod, and the right elastic locking pin falls into the right locking pin hole for locking connection; the right rear bottom cross rod and the right rear wheel foot rod are detachably connected through the right elastic locking pin and the right locking pin hole.

5. The rear wheel shock absorbing device of a wheelchair according to claim 1, characterized in that: The left movable component is integrally formed and includes a left front fork and a left rear fork. The top of the telescopic rod of the left gas rod is inserted into the left rear fork, and the left rear screw assembly is used to cross the rear of the left movable component and the top of the telescopic rod of the left gas rod to form a movable connection; the middle section of the left vertical rod is inserted into the left front fork, and the left front screw assembly is used to cross the front of the left movable component and the middle section of the left vertical rod to form a movable connection; the inner section of the left shaft core crosses the middle section of the left movable component for fixed connection.

6. The rear wheel shock absorbing device of a wheelchair according to claim 1, characterized in that: The right movable component is integrally formed, including a right front fork and a right rear fork. The top of the telescopic rod of the right gas rod is inserted into the right rear fork, and the right rear screw assembly is used to cross the rear of the right movable component and the top of the telescopic rod of the right gas rod to form a movable connection; the middle section of the right vertical rod is inserted into the right front fork, and the right front screw assembly is used to cross the front of the right movable component and the middle section of the right vertical rod to form a movable connection; the inner section of the right shaft core crosses the middle section of the right movable component for fixed connection.

7. The rear wheel shock absorbing device of a wheelchair according to claim 1, characterized in that: The upper section of the left vertical rod is fixedly connected to the left upper side rod forward; the lower section of the left vertical rod is fixedly connected to the left lower side rod forward; the front ends of the left upper side rod and the left lower side rod are fixedly connected to the left front vertical rod together; The upper section of the right vertical rod is fixedly connected to the right upper side rod forward; the bottom section of the right vertical rod is fixedly connected to the right lower side rod forward; the front ends of the right upper side rod and the right lower side rod are fixedly connected to the right front vertical rod together.

8. The rear wheel shock absorbing device of a wheelchair according to claim 7, characterized in that: An X-shaped seat frame is hinged between the left lower side rod and the right lower side rod.

9. The rear wheel shock absorbing device of a wheelchair according to claim 7, characterized in that: The bottom of the left front vertical rod is connected with a left front caster; the bottom of the right front vertical rod is connected with a right front caster.

10. The rear wheel shock absorbing device of a wheelchair according to claim 1, characterized in that: The left inverted L-shaped vertical rod and the right inverted L-shaped vertical rod are made of aluminum tubes.

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