Folding wheelchair

Abstract

The utility model discloses a folding wheelchair. The rear part of a seat of the folding wheelchair is movably hinged with the middle section of a backrest frame; the front bottom of the seat is movably hinged with the top of the front foot stool; the front foot stool is movably hinged with the front end of the supporting device; the rear end of the supporting device is movably hinged with the lower part of the backrest frame; the front bottom of the seat is connected with a locking device; the front bottom of the seat is transversely and movably connected with a positioning frame; the middle of the front foot stand is movably connected with the bottom of an elastic damping device, and the top of the elastic damping device is fixedly connected with the positioning frame. The lock catch device is connected with the positioning frame in a lockable and openable manner; the product is convenient for people to open the lock catch device from the front side for unlocking and folding the wheelchair; and the elastic damping device is arranged between the front foot stand and the seat, so that the shock absorption capability is better, the patient can sit more comfortably, the vibration sense is reduced, and the compression and shock absorption are more balanced.

Description

Technical Field

[0001] The utility model relates to a wheelchair, in particular to a foldable wheelchair. Background Art

[0002] 1. Chinese patent document publication number CN215652131U discloses a folding wheelchair with shock absorption function, a folding wheelchair with shock absorption function, comprising a backrest frame, a seat frame, a front frame, a rear frame, a first shock absorption assembly and a second shock absorption assembly; the front frame is hinged to the middle position of the lower end of the backrest frame, the rear frame is hinged to the end position of the lower end of the backrest frame, the seat frame is located above the front frame and one end is hinged to the backrest frame, the front frame comprises a front fork arranged at the lower end, the upper end of the first shock absorption assembly is connected to the front frame, and the lower end is connected to the front fork; the upper end of the second shock absorption assembly is hinged to the seat frame, and the lower end is hinged to the front frame. The first shock absorption assembly comprises a shock absorption lower support tube and a shock absorption upper support rod, the shock absorption upper support rod is slidably connected in the shock absorption lower support tube, a shock absorption spring is arranged in the shock absorption lower support tube, and the shock absorption spring is located between the shock absorption lower support tube and the shock absorption upper support rod. The second shock-absorbing assembly includes a connecting shaft, a flat spring is sleeved on the connecting shaft, a step nut is provided at the upper end of the connecting shaft, the step nut is embedded and installed on the front frame, the front fork is provided with an assembly hole, and the lower end of the connecting shaft is connected to the assembly hole; locking devices are provided on the left and right sides between the front frame and the rear frame for unfolding and fixing the wheelchair.

[0003] The above-mentioned product is provided with a first shock-absorbing assembly and a second shock-absorbing assembly, and the first shock-absorbing assembly and the second shock-absorbing assembly are separately arranged from the locking device, and are inconvenient to fold and unlock; the two shock-absorbing assemblies are arranged on the left and right sides of the wheelchair. After long-term use, if the elasticity of one of the shock-absorbing assemblies weakens and becomes unbalanced, when a person sits on it, the seat frame will tilt and sink to one side, making the sitting situation unbalanced and uncomfortable.

[0004] 2. Chinese patent document announcement number CN210250325U discloses a foldable wheelchair, which comprises a left front foot rod, a right front foot rod, a left rear foot rod, a right rear foot rod, a chair back frame and a chair seat; the bottom end of the chair back frame is movably connected to the rear end of the chair seat; the bottom ends of the left front foot rod, the right front foot rod, the left rear foot rod and the right rear foot rod are all connected to casters; a front cross bar is connected between the left front foot rod and the right front foot rod, the upper end of the left front foot rod is movably connected to the left front end of the back side of the chair seat, and the upper end of the right front foot rod is movably connected to the right front end of the back side of the chair seat; the left rear foot rod and the right rear foot rod are inclined from the back to the front, and the upper end of the left rear foot rod is movably connected to the left front end of the back side of the chair seat. The left end of the backrest frame is movably connected to the left front end of the back of the seat, and the upper end of the right rear foot rod is movably connected to the right front end of the back of the seat; the left and right sides of the bottom end of the backrest frame are movably connected to the left front hinge piece and the right front hinge piece, respectively, and the other ends of the left and right hinge pieces are movably connected to the corresponding lower sections of the left front foot rod and the right front foot rod; the left and right sides of the bottom end of the backrest frame are movably connected to the left rear hinge piece and the right rear hinge piece, respectively, and the left rear hinge piece and the right rear hinge piece are movably connected to the corresponding lower ends of the left rear foot rod and the right rear foot rod; the left rear foot rod and the right rear foot rod are both connected and fixed with a left support member and a right support member supporting the corresponding left rear hinge piece and the right rear hinge piece. A locking member is connected to the left support member or the right support member.

[0005] The above wheelchair is mainly shock-absorbing through four rubber casters, and its shock-absorbing capacity is limited and the shock-absorbing effect is not good; secondly, locking fasteners are arranged at the lower sections of the left rear foot rod and the right rear foot rod, which is inconvenient to lock and unlock. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a foldable wheelchair with reasonable structural design, which is convenient for locking and fixing the wheelchair after unfolding, convenient for manual unlocking and folding, and has a shock-absorbing effect.

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

[0008] A foldable wheelchair comprises a rear caster assembly, a backrest frame, a seat, a front foot frame, a front caster assembly, and a supporting device; the rear caster assembly is installed and connected to the left and right sides of the bottom of the backrest frame; the rear part of the seat is movably hinged to the middle section of the backrest frame; the front bottom of the seat is movably hinged to the top of the front foot frame; the front caster assembly is installed and connected to the left and right sides of the bottom of the front foot frame; the front foot frame is movably hinged to the front end of the supporting device, and the rear end of the supporting device is movably hinged to the lower part of the backrest frame. After the wheelchair is unfolded, the supporting device uses the backrest frame as a base frame to support and stabilize the front foot frame forward; and the wheelchair further comprises a spring The invention relates to a wheelchair comprising a locking device, a positioning frame, and a front bottom portion of the seat. The locking device is connected to the front bottom portion of the seat. The front bottom portion of the seat is laterally movably connected to the positioning frame. The middle portion of the front leg frame is movably connected to the bottom portion of the elastic shock absorbing device, and the top portion of the elastic shock absorbing device is connected and fixed to the positioning frame. The locking device and the positioning frame are lockably and openably connected. When the seat, the front leg frame, and the supporting device are linked and unfolded, the locking device is locked and connected to the positioning frame, that is, the wheelchair is fixed and cannot be folded after being unfolded. When the locking device is opened, the seat, the front leg frame, and the supporting device can be linked and hinged and folded, that is, the wheelchair can be folded.

[0009] The beneficial effects of a folding wheelchair of the utility model are as follows: 1. A locking device is connected to the front bottom of the seat of this product, which is convenient for people to open the locking device from the front to unlock it, and it is convenient for the wheelchair to be folded and used; 2. An elastic shock-absorbing device is formed between the front foot frame and the seat of this product. When the wheelchair encounters potholes, bumps, and uneven roads during the rolling process of the road, the elastic shock-absorbing device provides shock absorption for the seat. The elastic shock-absorbing device can weaken larger shock waves, greatly reducing the shock waves of the front foot frame that bears gravity, making the patient sit more comfortably and reducing the sense of shock; smaller shock waves can be basically eliminated, so that the patient does not feel shock when sitting in the wheelchair, and the shock absorption effect is good. 3. An elastic shock-absorbing device is set in the middle between the front foot frame and the seat, and its compression shock absorption is relatively balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 , Figure 2 A three-dimensional diagram of the product of the utility model;

[0011] Figure 3 , Figure 4 This is a disassembled diagram of the utility model product;

[0012] Figure 5 This is a disassembled diagram of the seat of the utility model product;

[0013] Figure 6 This is a disassembled diagram of the locking device of the utility model product;

[0014] Figure 7 This is a disassembled diagram of the elastic shock absorbing device and the positioning frame of the utility model product;

[0015] Figure 8 This is a three-dimensional diagram of the elastic shock absorbing device of the utility model product;

[0016] Fig. 9 , Fig.10 , Fig.11 , Fig.12 A three-dimensional diagram of the chair frame of the utility model product;

[0017] Fig.13 This is a cross-sectional view of the elastic shock absorbing device of the utility model;

[0018] Fig.14 , Fig.15 , Fig.16 , Fig.17 A reference diagram of the folded state of the product of the utility model;

[0019] Fig.18 , Fig.19 A three-dimensional diagram of the product of the utility model;

[0020] Fig. 20 It is a side view of the product of the utility model;

[0021] Fig.21 , Fig. 22 This is a disassembled diagram of the utility model product;

[0022] Fig.23 , Fig.24 , Fig.25 This is a reference diagram of the folded state of the product of the utility model.

[0023] Rear caster assembly 1, backrest frame 2, seat 3, front leg frame 4, front caster assembly 5, support device 6, elastic shock absorbing device 7, locking device 8, positioning frame 9, left rear cart handle A, right rear cart handle B, left handrail C, right handrail D, left bottom support rod E, left bottom caster E1, right bottom support rod F, right bottom caster F1, left backrest vertical rod 21, upper backrest cross bar 22, lower backrest cross bar 23, rear support ear assembly 231, right backrest vertical rod 24, backrest cushion 25, seat board 31, bottom support bent rod frame 32, left side connection Ear 33, right side connecting ear 34, left front foot rod 41, front cross foot rod 42, front ear assembly 421, right front foot rod 43, first ear 44, left support plate 61, right support plate 62, support stabilizing frame 601, lock connecting lower protrusion 81, torsion spring 82, cross nail rod 83, lock hook 84, left positioning connecting head piece 91, positioning cross rod 92, right positioning connecting head piece 93, base 71, pressure spring 72, inverted T-shaped positioning shaft core 73, upper seat 74, shaft core through hole 711T, shaped positioning cavity 731. DETAILED DESCRIPTION

[0024] A foldable wheelchair comprises a rear caster assembly 1, a backrest frame 2, a seat 3, a front foot frame 4, a front caster assembly 5, and a supporting device 6; the supporting device 6 is made of aluminum and is light in weight; the rear caster assembly 1 is installed and connected to the left and right sides of the bottom of the backrest frame 2, and the rear caster assembly 1 and the front caster assembly 5 are used to push the wheelchair for walking; the rear part of the seat 3 is movably hinged with the middle section of the backrest frame 2, and a hinge point at a suitable position is set to facilitate the hinged folding wheelchair; the front bottom of the seat 3 is movably hinged with the top of the front foot frame 4, and a hinge point at a suitable position is set to facilitate the hinged folding wheelchair; the left and right sides of the bottom of the front foot frame 4 are installed A front caster assembly 5 is installed and connected; the front leg frame 4 is movably hinged with the front end of the support device 6, and the rear end of the support device 6 is movably hinged with the lower part of the backrest frame 2. After the wheelchair is unfolded, the support device 6 uses the backrest frame 2 as a base frame to support and stabilize the front leg frame 4 forward to prevent the seat 3 and the front leg frame 4 from shaking, and prevent the seat 3 and the front leg frame 4 from shifting left and right, and the unfolded span of the front leg frame 4 is positioned and fixed, so that the vehicle body is more stable and the vehicle body structure is more solid; when the wheelchair is folded, the support device 6 is linked and hinged to be folded; the main technical improvement of this product is that the foldable wheelchair also includes an elastic shock absorbing device 7, a locking device 8, and a positioning frame 9;

[0025] The front bottom of the seat 3 is connected to a locking device 8, which is convenient for people to open the locking device 8 from the front to unlock it, making it convenient for the wheelchair to be folded and used;

[0026] The front bottom of the seat 3 is laterally movably connected with a positioning frame 9, which is convenient for hinged folding and can be folded along with the front leg frame 4 and the elastic shock absorbing device 7; the positioning frame 9 is used to center the elastic shock absorbing device 7 to prevent the elastic shock absorbing device 7 from shaking left and right and shifting, so that the elastic shock absorbing device 7 can only move elastically upward and downward; the positioning frame 9 is made of aluminum and is light in weight;

[0027] The middle part of the front foot frame 4 is movably connected to the bottom of the elastic shock absorbing device 7, and the top of the elastic shock absorbing device 7 is connected and fixed to the positioning frame 9; after the wheelchair is unlocked, during the folding process, the positioning frame 9 movably follows the front foot frame 4 as it flips and folds, and the elastic shock absorbing device 7 changes position with the front foot frame 4;

[0028] The locking device 8 is connected to the positioning frame 9 in a lockable and openable manner; when the seat 3, the front leg frame 4, and the supporting device 6 are linked and unfolded, the locking device 8 is locked and connected to the positioning frame 9, that is, the wheelchair is fixed and cannot be folded after being unfolded, and can be sat on and used normally; when the locking device 8 is opened, the seat 3, the front leg frame 4, and the supporting device 6 can be linked and hinged and folded, that is, the wheelchair can be folded and cannot be sat on and used normally. The locking device 8 cooperates with the positioning frame 9 to facilitate unlocking and locking.

[0029] This product is provided with an elastic shock absorbing device 7 between the front leg frame 4 and the seat 3. When the wheelchair is in the unfolded state and in use, a person sits on the seat 3. When the wheelchair encounters potholes, bumps, or uneven roads during its rolling process, the elastic shock absorbing device 7 provides shock absorption for the seat 3. The elastic shock absorbing device 7 can weaken larger shock waves, greatly reducing the shock waves of the front leg frame 4 that bears gravity, making the patient sit more comfortably and reducing the sense of vibration; it can basically eliminate smaller shock waves, making the patient feel no vibration when sitting on the wheelchair, and the shock absorption effect is good.

[0030] Folding process:

[0031] When the wheelchair is in the unfolded state, the front edge of the seat 3 is grasped by hand and the locking device 8 is operated manually to open the locking device 8 so that the locking device 8 no longer locks the positioning frame 9, and then the seat 3 is flipped up by hand. The seat 3 flips up, the locking device 8 disengages from the positioning frame 9, the seat 3 moves closer to the backrest frame 2, the supporting device 6 flips up accordingly, the front leg frame 4 moves closer to the backrest frame 2 and flips toward the back side of the seat 3, the seat 3, the front leg frame 4, and the supporting device 6 are hinged and folded at the same time, the elastic shock absorbing device 7 and the positioning frame 9 change their positions with the flipping movement of the front leg frame 4, the seat 3 is stopped after being pressed against the backrest frame 2, and the front leg frame 4 is stopped after being pressed against the back side of the seat 3, and the folding is completed.

[0032] Unfolding process:

[0033] When the wheelchair is in the folded state, the front edge of the seat 3 is grasped by hand and turned forward, or the front leg frame 4 is grasped by hand and turned and unfolded, the seat 3, the front leg frame 4, and the supporting device 6 are simultaneously linked and unfolded, and the locking device 8 moves closer to the positioning frame 9. When unfolded to the full extent, the positioning frame 9 falls into the locking device 8 and is locked so that it cannot fall out naturally. The unfolding is completed and the wheelchair is firmly locked and can be used normally.

[0034] Preferably: the front foot frame 4 is made of aluminum tube, light in weight, and the surface can be painted to change color; the front foot frame 4 includes a left front foot rod 41, a front horizontal foot rod 42, a right front foot rod 43, and a first ear 44; the lower section between the left front foot rod 41 and the right front foot rod 43 is horizontally welded and fixedly connected to the front horizontal foot rod 42; the bottom of the left front foot rod 41 and the right front foot rod 43 is installed and connected with a front caster assembly 5 (the front caster assembly 5 includes a left front caster and a right front caster; that is: the bottom of the left front foot rod 41 and the right front foot rod 43 is correspondingly installed and connected with a left front caster and a right front caster); the left and right sides of the front bottom of the seat 3 are respectively movably hinged with the corresponding tops of the left front foot rod 41 and the right front foot rod 43;

[0035] The middle inner wall of the front horizontal foot rod 42 is welded with a first ear 44, and the first ear 44 is movably connected to the bottom of the elastic shock absorbing device 7, so as to facilitate the vertical setting of the elastic shock absorbing device 7 and balance the shock absorption.

[0036] This is to further refine the specific structure of the front tripod 4, which is reasonably arranged, easy to produce, firm, simple and uncomplicated, and has a good appearance.

[0037] Preferably: the positioning frame 9 includes a left positioning connector 91, a positioning cross bar 92, and a right positioning connector 93; the front ends of the left positioning connector 91 and the right positioning connector 93 are welded or fixedly connected to the corresponding two ends of the positioning cross bar 92 through a threaded structure; the top of the elastic shock absorbing device 7 is connected and fixed to the middle section of the positioning cross bar 92 by a through-connection or a screw assembly; the rear parts of the left positioning connector 91 and the right positioning connector 93 are movably connected to the left and right sides of the front bottom of the corresponding seat 3 respectively.

[0038] This is to further refine the specific structure of the positioning frame 9. The structure is reasonably arranged, easy to produce, simple and uncomplicated, and can perform centering, stabilizing, and balanced positioning work on the elastic damping device 7.

[0039] Preferably: the elastic shock absorbing device 7 includes a base 71, a pressure spring 72, an inverted T-shaped positioning shaft core 73, and an upper seat 74. A T-shaped positioning cavity is provided inside the base 71, and an axis core through hole 711 is provided in the middle of the top of the base 71 to communicate with the T-shaped positioning cavity. The axis core rod of the inverted T-shaped positioning shaft core 73 is connected to the axis core through hole, and the bottom section of the inverted T-shaped positioning shaft core 73 is connected to the T-shaped positioning cavity 731. The bottom of the inverted T-shaped positioning shaft core 73 is hooked with the T-shaped positioning cavity to limit and prevent slipping (because the large diameter of the bottom of the inverted T-shaped positioning shaft core 73 is set in the T-shaped positioning cavity, the bottom diameter of the inverted T-shaped positioning shaft core 73 is larger than the axis core through hole, so Therefore, the bottom of the inverted T-shaped positioning shaft core 73 cannot escape from the shaft core through hole; the bottom diameter of the inverted T-shaped positioning shaft core 73 is equivalent to the diameter of the T-shaped positioning cavity, which is just right, and the T-shaped positioning cavity also utilizes the top narrowing to prevent the inverted T-shaped positioning shaft core 73 from escaping). The top of the inverted T-shaped positioning shaft core 73 is integrated with the upper seat 74 or welded and fixedly connected, and a pressure spring 72 is clamped and connected between the base 71 and the upper seat 74, and the pressure spring 72 is connected to the outside of the inverted T-shaped positioning shaft core 73; during the compression or extension of the pressure spring 72, the inverted T-shaped positioning shaft core 73 can slide up and down in the T-shaped positioning cavity, thereby forming elastic shock absorption, so that the seat 3 has a shock absorption effect.

[0040] The middle section of the positioning cross bar 92 is connected and fixed to the upper seat 74 in a through-connection manner; the first ear 44 is movably connected to the base 71 through a screw assembly, that is, a screw is used to cross the bottom of the first ear 44 and the base 71 to form a movable connection.

[0041] This is to further refine the specific structure of the elastic shock absorbing device 7. The structure is reasonably arranged, the upper and lower elastic compression is stable, the clamping pressure spring 72 is stable, and the shock absorbing effect is good.

[0042] Preferably, the seat 3 comprises a seat plate 31, a bottom supporting bent rod frame 32, a left connecting lug 33, and a right connecting lug 34; the seat plate 31 is made of a plastic plate or a plastic plate wrapped with leather or a hard plate wrapped with fabric. The bottom supporting bent rod frame 32 is made of aluminum or iron pipe; the left connecting lug 33 and the right connecting lug 34 are made of aluminum sheet or iron sheet;

[0043] The bottom of the seat plate 31 is fixedly connected to the top of the bottom supporting bent rod frame 32 by tightening a number of screws; the left and right middle parts of the bottom supporting bent rod frame 32 are welded and fixedly connected with corresponding left connecting ears 33 and right connecting ears 34 downwardly, and the left connecting ear 33 is movably connected with the top of the left front foot rod 41 and the rear of the left positioning connecting head 91 (that is, the screw assembly is used to cross the left connecting ear 33, the top of the left front foot rod 41, and the rear of the left positioning connecting head 91 to lock and connect as a whole to prevent falling off); the right connecting ear 34 is movably connected with the top of the right front foot rod 43 and the rear of the right positioning connecting head 93 (that is, the screw assembly is used to cross the right connecting ear 34, the top of the right front foot rod 43, and the rear of the right positioning connecting head 93 to lock and connect as a whole to prevent falling off); the front bottom of the bottom supporting bent rod frame is connected with a locking device 8;

[0044] The left and right rear parts of the bottom supporting bent rod frame 32 are movably hinged with the left and right sides of the middle section of the backrest frame 2 (that is, a left screw is crossed through the left rear part of the bottom supporting bent rod frame 32 and the left side of the middle section of the backrest frame 2 to lock and connect as an integrated anti-slipping and form a movable connection; a right screw is crossed through the right rear part of the bottom supporting bent rod frame 32 and the right side of the middle section of the backrest frame 2 to lock and connect as an integrated anti-slipping and form a movable connection).

[0045] This is to further refine the specific structure of the seat 3. The structure is reasonably arranged and easy to assemble, so that the bottom supporting bent rod frame 32 can be flexibly connected with the backrest frame 2, and the left connecting ear 33 and the right connecting ear 34 can be flexibly connected with the corresponding left front foot rod 41 and the right front foot rod 43. The whole structure is easy to be hinged, folded and unfolded for use.

[0046] Preferably: the backrest frame 2 includes a left backrest vertical rod 21, an upper backrest cross bar 22, a lower backrest cross bar 23, and a right backrest vertical rod 24. The left backrest vertical rod 21, the upper backrest cross bar 22, the lower backrest cross bar 23, and the right backrest vertical rod 24 are made of aluminum tubes and are light in weight; the upper section between the left backrest vertical rod 21 and the right backrest vertical rod 24 is welded and fixedly connected to the upper backrest cross bar 22, and the bottom section between the backrest vertical rod and the right backrest vertical rod 24 is welded and fixedly connected to the lower backrest The back cross bar 23, the upper section between the left backrest vertical bar 21 and the right backrest vertical bar 24 is sewn or nailed to the backrest pad 25, and the backrest pad 25 is made of woven cloth or leather; the rear caster assembly 1 is installed and connected to the outer side of the bottom of the left backrest vertical bar 21 and the right backrest vertical bar 24; the rear caster assembly 1 includes a left rear caster and a right rear caster, and the outer side of the bottom of the left backrest vertical bar 21 and the right backrest vertical bar 24 are respectively installed and connected to the corresponding left rear caster and right rear caster;

[0047] The left rear portion of the bottom supporting bent rod frame 32 is movably hinged to the middle section of the left backrest vertical rod 21 (i.e., the left rear portion of the bottom supporting bent rod frame 32 and the middle section of the left backrest vertical rod 21 are jointly crossed by the left screw for locking connection to prevent falling off as a whole, and a movable connection is formed); the right rear portion of the bottom supporting bent rod frame 32 is movably hinged to the middle section of the right backrest vertical rod 24 (i.e., the right rear portion of the bottom supporting bent rod frame 32 and the middle section of the right backrest vertical rod 24 are jointly crossed by the right screw for locking connection to prevent falling off as a whole, and a movable connection is formed).

[0048] This is to further refine the specific structure of the backrest frame 2, which has a reasonable structure, a firm structure, is easy to produce, and has a simple structure.

[0049] Preferably, the support device 6 comprises a left support piece 61 and a right support piece 62; the left support piece 61 and the right support piece 62 are made of aluminum or iron; the left support piece 61 and the right support piece 62 can also be replaced by metal pipes; the front ends of the left support piece 61 and the right support piece 62 are movably connected with the middle and upper sections of the corresponding left front foot rod 41 and the right front foot rod 43 (that is, the front end of the left support piece 61 and the middle and upper section of the left front foot rod 41 are connected and fixed together through the screw assembly to prevent them from falling off; The front end of the right support piece 62 and the middle upper section of the right front foot rod 43 are jointly traversed through the screw assembly to be connected and fixed to prevent falling off. The rear ends of the left support piece 61 and the right support piece 62 are movably hinged with the corresponding lower sections of the left backrest vertical rod 21 and the right backrest vertical rod 24 (i.e., the rear end of the left support piece 61 and the lower section of the left backrest vertical rod 21 are jointly traversed through the screw assembly to be connected and fixed to prevent falling off; the rear end of the right support piece 62 and the lower section of the right backrest vertical rod 24 are jointly traversed through the screw assembly to be connected and fixed to prevent falling off).

[0050] This is to further refine the specific structure of the supporting device 6. The structure is reasonably arranged, has good supporting force, is easy to produce, has a simple structure, is easy to assemble, has one piece on each side, and is reasonably arranged.

[0051] Preferably: the locking device 8 is made of metal; the locking device 8 includes a locking connection lower protrusion 81, a torsion spring 82, a cross nail rod 83, and a locking hook 84; the front bottom of the bottom supporting the bent rod frame 32 is welded downward and fixedly connected with the locking connection lower protrusion 81; the cross nail rod 83 crosses the locking connection lower protrusion 81, the torsion spring 82, and the locking hook 84 to connect the three as a whole; one leg of the torsion spring 82 presses on the locking connection lower protrusion 81, and the other leg presses on the locking hook 84; the torsion spring 82 is clamped between the locking hook 84 and the locking connection lower protrusion 81, and the locking hook 84 forms an elastic locking hook 84 through the torsion spring 82; under normal conditions, the locking hook 84 is in a hooked state; this is to further refine the specific structure of the locking device 8, which is reasonably arranged, has good elastic reset ability, is simple in structure, and is easy to open, lock, and assemble.

[0052] The locking hook 84 is connected to the positioning frame 9 in a lockable and openable manner (i.e., the locking hook 84 is connected to the positioning cross bar 92 in a lockable and openable manner). After the locking hook 84 is locked and connected to the positioning frame 9, the wheelchair is fixed and cannot be folded after being unfolded; when the locking hook 84 is opened from the positioning frame 9 (i.e., when the locking hook 84 is opened from the positioning cross bar 92, the positioning cross bar 92 is separated from the locking hook 84), the wheelchair can be folded.

[0053] When the wheelchair is unfolded and in place, the positioning cross bar 92 automatically falls into the locking hook 84 and is locked, and the wheelchair is automatically locked, so that the wheelchair is fixed and cannot be folded after being unfolded; when the wheelchair is to be folded, the locking hook 84 is flipped by hand to disengage it from the positioning cross bar 92, and the wheelchair can be folded at this time.

[0054] Another preferred support device technical solution: Figure 18 to Figure 25 As shown: the support device 6 is an integrated support and stabilizing frame 601, which is made of metal; a rear support ear assembly 231 extends from the inner wall of the lower backrest cross bar 23; a front support ear assembly 421 is connected to the inner wall of the middle section of the front cross foot rod 42; the front end of the support and stabilizing frame 601 is movably connected to the front support ear assembly 421 (that is, the front end of the support and stabilizing frame 601 and the front support ear assembly 421 are connected and fixed to prevent falling off together through a screw assembly), and the rear end of the support and stabilizing frame 601 is movably connected to the rear support ear assembly 231 (that is, the rear end of the support and stabilizing frame 601 and the rear support ear assembly 231 are connected and fixed to prevent falling off together through a screw assembly).

[0055] The above structure can also realize the connection and support between the backrest frame 2 and the front leg frame 4, so that the front leg frame 4 can be supported stably after being unfolded.

[0056] Preferably: the tops of the left backrest vertical rod 21 and the right backrest vertical rod 24 are respectively rotatably connected to the corresponding left rear cart handle A and right rear cart handle B (that is, the lower section of the left rear cart handle A is inserted into the top rod hole of the left backrest vertical rod 21, and the left rear cart handle A is rotatable; the lower section of the right rear cart handle B is inserted into the top rod hole of the right backrest vertical rod 24, and the right rear cart handle B is rotatable.), the left rear cart handle A and the right rear cart handle B can be rotatably folded to form the same setting, so that the left rear cart handle A and the right rear cart handle B are not protruded backward, and the left rear cart handle A and the right rear cart handle B are arranged horizontally to compress the space, which is convenient for the handles to be folded and packed more tightly; the middle part of the front horizontal foot rod 42 is movably connected to the footrest frame through the screw assembly, and the footrest frame can be flipped and folded upward to compress the packaging volume.

[0057] Preferably: a left armrest C is hinged to the middle and upper section of the left backrest vertical rod 21. After the wheelchair is unfolded, the left armrest C is flipped open for use. When folded, the left armrest C is flipped and folded to compress the packaging volume; a right armrest D is hinged to the middle and upper section of the right backrest vertical rod 24. After the wheelchair is unfolded, the right armrest D is flipped open for use. When folded, the right armrest D is flipped and folded to compress the packaging volume.

[0058] Preferably: the bottom rear wall of the left backrest vertical rod 21 is fixedly connected to a left bottom support rod E connected backwards, and a left bottom caster E1 is installed at the bottom end of the left bottom support rod E; the bottom rear wall of the right backrest vertical rod 24 is fixedly connected to a right bottom support rod F connected backwards, and a right bottom caster F1 is installed at the bottom end of the right bottom support rod F; when a person sits in a wheelchair, if he lies back or leans back, the gravity moves backwards, the center of gravity moves backwards, and the left bottom support rod E and the right bottom support rod F play a role in preventing the wheelchair from tipping over / overturning backwards, and increase the supporting stability of the rear part of the wheelchair; when a person sits in the wheelchair and pushes uphill, the supporting stability of the rear part of the wheelchair is increased to prevent the wheelchair from tipping over / overturning backwards; when the wheelchair is folded, the left bottom caster E1, the right bottom caster F1, and the rear caster assembly 1 form four fulcrums, so that the wheelchair can be placed upright after being folded for easy storage.

Claims

1. A foldable wheelchair, comprising a rear caster assembly, a backrest frame, a seat, a front leg frame, a front caster assembly, and a supporting device; the rear caster assembly is installed and connected to the left and right sides of the bottom of the backrest frame; the rear part of the seat is movably hinged to the middle section of the backrest frame; the front bottom of the seat is movably hinged to the top of the front leg frame; the front caster assembly is installed and connected to the left and right sides of the bottom of the front leg frame; the front leg frame is movably hinged to the front end of the supporting device, and the rear end of the supporting device is movably hinged to the lower part of the backrest frame. After the wheelchair is unfolded, the supporting device uses the backrest frame as a base frame to support and stabilize the front leg frame forward; it is characterized in that: It also includes an elastic shock absorbing device, a locking device, and a positioning frame; A locking device is connected to the front bottom of the seat; The front bottom of the seat is laterally movably connected with a positioning frame; The middle part of the front leg frame is movably connected to the bottom of the elastic shock absorbing device, and the top of the elastic shock absorbing device is connected and fixed to the positioning frame; The locking device is connected to the positioning frame in a lockable and openable manner; when the seat, the front leg frame and the supporting device are linked and unfolded, the locking device is locked and connected to the positioning frame, that is, the wheelchair is fixed and cannot be folded after being unfolded; when the locking device is opened, the seat, the front leg frame and the supporting device can be linked and hinged and folded, that is, the wheelchair can be folded.

2. A foldable wheelchair according to claim 1, characterized in that: The front foot frame comprises a left front foot rod, a front horizontal foot rod, a right front foot rod, and a first ear; the lower section between the left front foot rod and the right front foot rod is fixedly connected to the front horizontal foot rod; the bottom of the left front foot rod and the right front foot rod are installed and connected with a front caster assembly; the left and right sides of the front bottom of the seat are respectively movably hinged with the top of the corresponding left front foot rod and the right front foot rod; The inner wall of the middle section of the front horizontal foot rod is connected with a first ear, and the first ear is movably connected to the bottom of the elastic shock absorbing device.

3. A foldable wheelchair according to claim 2, characterized in that: The positioning frame includes a left positioning connecting head, a positioning cross bar, and a right positioning connecting head; the front ends of the left positioning connecting head and the right positioning connecting head are fixedly connected to the corresponding two ends of the positioning cross bar; the top of the elastic shock absorbing device is fixedly connected to the middle section of the positioning cross bar; the rear parts of the left positioning connecting head and the right positioning connecting head are movably connected to the left and right sides of the front bottom of the corresponding seat respectively.

4. A foldable wheelchair according to claim 3, characterized in that: The elastic shock absorbing device comprises a base, a pressure spring, an inverted T-shaped positioning shaft core, and an upper seat. A T-shaped positioning cavity is provided inside the base, and an shaft core through hole is provided in the middle of the top of the base to communicate with the T-shaped positioning cavity. The shaft core rod of the inverted T-shaped positioning shaft core is connected to the shaft core through hole, and the bottom section of the inverted T-shaped positioning shaft core is connected and installed in the T-shaped positioning cavity. The bottom of the inverted T-shaped positioning shaft core and the T-shaped positioning cavity are hooked and tightened with each other to limit and prevent slipping. The top of the inverted T-shaped positioning shaft core is fixedly connected to the upper seat. A pressure spring is clamped and connected between the base and the upper seat, and the pressure spring is connected to the outside of the inverted T-shaped positioning shaft core. The middle section of the positioning cross bar is fixedly connected to the upper seat; the first support ear is movably connected to the base.

5. A foldable wheelchair according to claim 3, characterized in that: The seat comprises a seat plate, a bottom supporting bent rod frame, a left connecting lug, and a right connecting lug; The seat plate is fixedly connected to the top of the bottom supporting bent rod frame; the left and right connecting ears are fixedly connected downwardly with corresponding left connecting ears and right connecting ears at the middle of the left and right sides of the bottom supporting bent rod frame; the left connecting ear is movably connected to the top of the left front foot rod and the rear of the left positioning connecting head piece; the right connecting ear is movably connected to the top of the right front foot rod and the rear of the right positioning connecting head piece; the front bottom of the bottom supporting bent rod frame is connected to a locking device; The rear parts of the left and right sides of the bottom supporting bent rod frame are movably hinged with the left and right sides of the middle section of the backrest frame.

6. A foldable wheelchair according to claim 5, characterized in that: The backrest frame comprises a left backrest vertical rod, an upper backrest cross rod, a lower backrest cross rod, and a right backrest vertical rod; the upper section between the left backrest vertical rod and the right backrest vertical rod is fixedly connected to the upper backrest cross rod; the lower section between the backrest vertical rod and the right backrest vertical rod is fixedly connected to the lower backrest cross rod; the upper section between the left backrest vertical rod and the right backrest vertical rod is fixedly connected to the backrest cushion; the rear caster assembly is installed and connected to the outer sides of the bottoms of the left backrest vertical rod and the right backrest vertical rod; The left rear part of the bottom supporting bent rod frame is movably hinged to the middle section of the left backrest vertical rod; the right rear part of the bottom supporting bent rod frame is movably hinged to the middle section of the right backrest vertical rod.

7. A foldable wheelchair according to claim 6, characterized in that: The supporting device includes a left supporting plate and a right supporting plate; the front ends of the left supporting plate and the right supporting plate are movably connected to the middle and upper sections of the corresponding left front foot rod and the right front foot rod, and the rear ends of the left supporting plate and the right supporting plate are movably hinged to the corresponding lower sections of the left backrest vertical rod and the right backrest vertical rod.

8. The foldable wheelchair according to claim 5, characterized in that: The lock device comprises a lock connection lower protrusion, a torsion spring, a cross nail rod, and a lock hook. The front bottom of the bottom supporting the bent rod frame is fixedly connected downward with a lock connection lower protrusion. The cross nail rod crosses the lock connection lower protrusion, the torsion spring, and the lock hook to connect the three as a whole. A torsion spring is clamped between the lock hook and the lock connection lower protrusion, and the lock hook forms an elastic lock hook through the torsion spring. The locking hook is connected to the positioning frame in a lockable and openable manner. After the locking hook is locked and connected to the positioning frame, the wheelchair is fixed and cannot be folded after being unfolded; when the locking hook is opened from the positioning frame, the wheelchair can be folded.

9. The foldable wheelchair according to claim 6, characterized in that: The supporting device is a supporting stabilizing frame; a rear supporting ear assembly is extended from the inner wall of the lower backrest cross bar; a front supporting ear assembly is connected to the inner wall of the middle section of the front cross foot bar; the front end of the supporting stabilizing frame is movably connected to the front supporting ear assembly, and the rear end of the supporting stabilizing frame is movably connected to the rear supporting ear assembly.

10. The foldable wheelchair according to claim 6, characterized in that: The tops of the left and right backrest vertical rods are rotatably connected to the corresponding left and right rear cart handles, respectively, and the left and right rear cart handles can be rotatably folded to form the same arrangement; the middle part of the front horizontal foot rod is movably connected to a footrest, and the footrest can be flipped and folded upwards.

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