Lifting folding wheelchair

Abstract

The invention belongs to the technical field of wheelchairs, and particularly relates to a lifting folding wheelchair which comprises a wheel frame, a seat frame and a backrest frame, a first cross rod and a second cross rod are arranged between the wheel frame and the seat frame, the upper ends of the first cross rod and the second cross rod are movably connected with the seat frame, and the lower ends of the first cross rod and the second cross rod are directly or indirectly connected with the wheel frame. The middle ends of the first cross rod and the second cross rod are rotationally connected, the upper end of the second cross rod is rotationally arranged at the rear end of the seat frame, a sliding groove is formed in the front end of the seat frame, a sliding device is arranged at the upper end of the first cross rod, and the sliding device is arranged in the sliding groove and can move in the sliding groove along with movement of the first cross rod. A driving mechanism and an elastic mechanism are further arranged on the seat frame, one end of the elastic mechanism is connected with the driving mechanism, the other end of the elastic mechanism is directly or indirectly connected with the first cross rod, and the wheelchair is simple in structure and capable of being rapidly folded and changing the height through lifting.

Description

Technical Field

[0001] The present invention belongs to the technical field of wheelchairs, and in particular relates to a lifting and folding wheelchair. Background Art

[0002] A wheelchair is a tool that helps people with limited mobility to walk. In order to facilitate transportation and carrying, wheelchairs currently on the market adopt a folding design, which allows them to change their size for easy storage or transportation. However, the existing folding structure is relatively complex, and the folding steps are cumbersome and single. When folding, it is often necessary to control the folding through a switch or other unlocking mechanism, which requires people with limited mobility to walk behind the wheelchair to turn on the switch, and it is impossible to fold or open it directly at one time. Therefore, there is a need for a folding wheelchair that can be folded quickly and the height can be changed by lifting. Summary of the Invention

[0003] The purpose of the present invention is to provide a wheelchair which has a simple structure, can be folded quickly, and can change height by lifting.

[0004] The object of the present invention is achieved like this:

[0005] The foldable wheelchair is constructed of wood and is easily adjustable and can be adjusted to fit any size or range of applications. The foldable wheelchair is constructed of wood and is easily adjustable and can be adjusted to fit any size or range of applications. The foldable wheelchair is constructed of wood and is easily adjustable and can be adjusted to fit any size or range of applications.

[0006] Furthermore, the driving mechanism includes a gear set and a driving device, the driving device includes a retractable box, a pull wire and a driving rod, the driving rod is provided with a first through hole, the seat frame is provided with a second through hole compatible with the first through hole, the pull wire passes through the second through hole and the first through hole, one end of the pull wire is provided with a limiting portion for limiting the pull wire from detaching from the first through hole, and the other end is connected to the retractable box, the driving rod is provided with a connecting seat, and one end of the elastic mechanism is connected to the connecting seat.

[0007] Furthermore, the seat frame is provided with a guide rod, which is provided with a guide groove. The end of the driving rod is arranged in the guide groove and can slide along the guide groove.

[0008] Furthermore, the driving device includes a transmission rod, a driving gear and a driven gear arranged on the transmission rod. Both ends of the transmission rod are connected to the backrest frame, and the driving gear is engaged with the driven gear. When the backrest frame is driven to open or fold relative to the seat frame, the backrest frame can drive the driving gear to rotate through the transmission rod, thereby driving the driven gear to rotate. A linkage rod is provided on the retractable box, and the retractable box is rotationally connected to the driven gear through the linkage rod.

[0009] Furthermore, the elastic mechanism is a tension spring, one end of the tension spring is connected to the connecting seat, and the other end is directly or indirectly connected to the first cross rod.

[0010] Furthermore, the number of the first cross rods and the second cross rods is two, a connecting rod is provided between the two first cross rods, and the connecting seat is also provided on the connecting rod, and the two ends of the tension spring are respectively connected to the connecting seat on the drive rod and the connecting seat on the connecting rod, driving the backrest frame to rotate and open relative to the seat frame, and the transmission rod drives the driving gear to rotate, so that the driven gear rotates. When the driven gear rotates, the retractable box rotates with the driven gear to tighten the pull wire. At this time, the pull wire can drive the driving rod to move backward, and the driving rod moves backward and pulls the connecting rod through the tension spring, thereby rotating the first cross rod and the second cross rod. At this time, the seat frame is lifted relative to the wheel frame, and the backrest frame is controlled to fold relative to the seat frame. The driving gear rotates in the opposite direction to rotate the driven gear, retract and release the pull wire, and the driving rod contacts the pulled force and moves forward. At this time, the first cross rod and the second cross rod rotate, and the seat frame descends relative to the wheel frame.

[0011] Furthermore, the gear group is also provided with a limit device, which includes a limit box and a limit member. The gear group is arranged in the limit box, and the limit member is connected to the driven gear. The limit member is provided with an abutment hook, and the limit box is provided with a limit rod. When the wheelchair is in a folded state, the limit member is arranged horizontally, driving the wheelchair to open, and the driving gear drives the driven gear to rotate. The driven gear can drive the limit member to rotate until the abutment hook catches the limit rod, and the driven gear is restricted from rotating.

[0012] Furthermore, the number of the sliding devices is the same as the number of the first cross bars. When the first cross bar rotates relative to the second cross bar, the sliding devices move along the sliding grooves. The sliding devices are sliding wheels.

[0013] Furthermore, the wheel frame includes a front chassis and a rear chassis, the lower end of the first cross rod is connected to the rear chassis, and the lower end of the second cross rod is connected to the front chassis.

[0014] Furthermore, the front frame and the rear frame are provided with a pair of front wheels and a pair of rear wheels, the rear frame is provided with an auxiliary rod facing backward, the end of the auxiliary rod is provided with an auxiliary wheel, the front frame is provided with a buffer spring, the front frame is provided with a pedal, and the backrest frame is rotatably provided with an armrest frame, the front end of the armrest frame is provided with an armrest portion, and the armrest portion is provided with a control switch.

[0015] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0016] The foldable wheelchair is convenient to use for people with limited mobility. The foldable wheelchair comprises a wheel frame, a seat frame and a backrest frame. The user sits on the seat frame and leans against the backrest frame. The accompanying person pushes the wheelchair to move via the wheel frame. A first cross bar and a second cross bar are provided between the wheel frame and the seat frame. The upper end of the first cross bar is slidably connected to the sliding groove on the seat frame by a sliding device. When the first cross bar rotates relative to the second cross bar, the sliding device can move in the sliding groove. At this time, the upper end of the first cross bar is relatively close to or away from the upper end of the second cross bar. The user implements this method by a driving mechanism and an elastic mechanism. The two ends of the elastic mechanism are respectively connected to the driving mechanism and the first cross bar diameter or indirectly. The driving mechanism pulls the first cross bar through the elastic mechanism, so that the seat frame can be lifted or lowered relative to the wheel frame. The elastic mechanism also brings an elastic function, which plays a buffering role for the structure of the entire wheelchair during the folding process. Compared with the pin-type lifting and folding device on the market, the foldable wheelchair is stable in movement and can be easily placed in a place with small storage space such as a trunk after folding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is one of the three-dimensional diagrams of the present invention.

[0018] Figure 2 It is a side view of the present invention.

[0019] Figure 3 It is the second stereogram of the present invention.

[0020] Figure 4 It is a schematic diagram of the guide rod of the present invention being arranged on the seat frame.

[0021] Figure 5 It is a connection diagram of the seat frame, the first cross bar, the second cross bar, the front bottom frame and the rear bottom frame of the present invention.

[0022] Figure 6 The utility model is a connection diagram of the seat frame, the backrest frame, the first cross bar, the second cross bar, the front bottom frame and the rear bottom frame of the present invention.

[0023] Figure 7 Schematic diagram of the driving device of the present invention.

[0024] Figure 8 It is a schematic diagram of the connection between the driving device and the pull wire of the present invention.

[0025] Figure 9 This is a separation diagram of the gear set and the retractable box of the present invention.

[0026] Figure 10 It is a three-dimensional diagram of the transmission rod and the driving mechanism of the present invention.

[0027] Figure 11 It is a three-dimensional diagram of the driving device of the present invention.

[0028] Figure 12 It is a schematic diagram of the connection between the pull wire and the connecting rod through the tension spring of the present invention.

[0029] The meaning of the numbers in the figure:

[0030] 1-wheel frame; 2-seat frame; 3-backrest frame; 4-first cross bar; 5-second cross bar; 6-sliding slot; 7-sliding wheel; 8-driving mechanism; 9-tension spring; 10-gear set; 11-driving device; 12-storage box; 13-pull wire; 14-front chassis; 15-rear chassis; 17-front wheel;

[0031] 18-rear wheel; 19-auxiliary rod; 20-auxiliary wheel; 21-buffer spring; 22-pedal; 23-armrest; 24-armrest; 25-driving rod; 26-first insertion hole; 27-second insertion hole; 28-limiting part; 29-connecting seat; 30-guide rod; 31-guide groove; 32-transmission rod; 33-driving gear; 34-driven gear; 35-linkage rod; 36-limit box; 37-limiting member; 38-abutting hook; 39-limiting rod; 40-connecting rod. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with specific embodiments:

[0033] The folding wheelchair of claim 1 is a lifting wheelchair comprising a wheel frame 1, a seat frame 2 and a backrest frame 3. A first cross rod 4 and a second cross rod 5 are provided between the wheel frame 1 and the seat frame 2. The upper ends of the first cross rod 4 and the second cross rod 5 are movably connected to the seat frame 2, and the lower ends are directly or indirectly connected to the wheel frame 1. The middle ends of the first cross rod 4 and the second cross rod 5 are rotatably connected. The upper end of the second cross rod 5 is rotatably arranged at the rear end of the seat frame 2, and a sliding groove 6 is provided at the front end of the seat frame 2. The upper end of the first cross rod 4 is provided with a sliding device, and the sliding device is provided in the sliding groove 6 and can move in the sliding groove 6 with the movement of the first cross rod 4. The seat frame 2 is also provided with a driving mechanism 8 and an elastic mechanism. One end of the elastic mechanism is connected to the driving mechanism 8, and the other end is directly or indirectly connected to the first cross rod 4. The driving mechanism 8 can drive the first cross rod 4 and the second cross rod 5 to rotate relative to each other through the elastic mechanism. When the first cross rod 4 and the second cross rod 5 rotate relative to each other, the wheelchair can be folded or opened.

[0034] The present invention is a lifting and folding wheelchair, which is convenient for people with mobility difficulties to use. The present invention consists of a wheel frame 1, a seat frame 2 and a backrest frame 3. The user sits on the seat frame 2 and leans against the backrest frame 3. The accompanying person pushes the wheelchair to move through the wheel frame 1. A first cross rod 4 and a second cross rod 5 are provided between the wheel frame 1 and the seat frame 2. The upper end of the first cross rod 4 is slidably connected to the sliding groove 6 on the seat frame 2 through a sliding device. When the first cross rod 4 rotates relative to the second cross rod 5, the sliding device can move in the sliding groove 6. At this time, the upper end of the first cross rod 4 is aligned with the upper end of the second cross rod 5. To move closer or further away, the user implements this method through the driving mechanism 8 and the elastic mechanism. The two ends of the elastic mechanism are respectively connected to the driving mechanism 8 and the first cross rod 4 in diameter or indirectly. The driving mechanism 8 pulls the first cross rod 4 through the elastic mechanism, so that the seat frame 2 can be lifted or lowered relative to the wheel frame 1. The elastic mechanism also brings an elastic function, which plays a buffering role for the structure of the entire wheelchair during the folding process. Compared with the latch-type lifting and folding on the market, the present invention moves stably and is easy to place in a place with smaller storage space such as a trunk after folding.

[0035] Preferably, the driving mechanism 8 includes a gear set 10 and a driving device 11, the driving device 11 includes a storage box 12, a pull wire 13 and a driving rod 25, the driving rod 25 is provided with a first insertion hole 26, the seat frame 2 is provided with a second insertion hole 27 adapted to the first insertion hole 26, the pull wire 13 passes through the second insertion hole 27 and the first insertion hole 26, one end of the pull wire 13 is provided with a limiting portion 28 that limits the pull wire 13 from being separated from the first insertion hole 26, and the other end is connected to the storage box 12, the driving rod 25 is provided with a connecting seat 29, and the elastic mechanism One end is connected to the connecting seat 29. The driving mechanism 8 of the present invention is divided into a gear set 10 and a driving device 11. The driving device 11 consists of a storage box 12, a pull wire 13 and a driving rod 25. The storage box 12 can rotate and store the pull wire 13. The pull wire 13 is provided with a limiting part 28 at one end passing through the second insertion hole 27 and the first insertion hole 26 to connect the two. When the pull wire 13 is pulled backward, the limiting part 28 limits the pull wire 13 from being disengaged from the first insertion hole 26. At this time, the driving rod 25 can be pulled by the pull wire 13. The pull wire 13 can be a common locking rope on the market.

[0036] Preferably, the seat frame 2 is also provided with a guide rod 30, and a guide groove 31 is opened on the guide rod 30. The end of the driving rod 25 is arranged in the guide groove 31 and can slide along the guide groove 31 to play a guiding role. The front end of the guide rod 30 is provided with an abutting threaded rod, which can limit the driving rod 25 from completely disengaging from the guide groove 31.

[0037] The driving gear 33 on the transmission rod 32 is meshed with the driven gear 34, and the linkage rod 35 on the driven gear 34 is connected to the storage box 12. When the driven gear 34 rotates, the storage box 12 rotates with the transmission rod 32, thereby realizing the tightening and loosening of the pull wire 13.

[0038] Preferably, the elastic mechanism is a tension spring 9, one end of the tension spring 9 is connected to the connecting seat 29, and the other end is directly or indirectly connected to the first cross rod 4. The present invention realizes pulling and buffering by connecting the two ends through the tension spring 9. When the driving rod 25 moves, one end of the tension spring 9 is pulled with the driving rod 25. At this time, the tension spring 9 is in a tensioned state. As the driving rod 25 continues to move, the front end of the tension spring 9 will be pulled by the force of the rear end, and at this time the first cross rod 4 can follow the movement synchronously.

[0039] Preferably, the number of the first cross rod 4 and the second cross rod 5 is two, a connecting rod 40 is provided between the two first cross rods 4, and the connecting seat 29 is also provided on the connecting rod 40, and the two ends of the tension spring 9 are respectively connected to the connecting seat 29 on the driving rod 25 and the connecting seat 29 on the connecting rod 40, driving the backrest frame 3 to rotate and open relative to the seat frame 2, and the transmission rod 32 drives the driving gear 33 to rotate, so that the driven gear 34 rotates. When the driven gear 34 rotates, the retractable box 12 rotates with the driven gear 34 to tighten the pull wire 13. At this time, the pull wire 13 can drive the driving rod 25 to move backward, and the driving rod 25 moves backward and is tightened by the tension spring The spring 9 pulls the connecting rod 40, thereby rotating the first cross rod 4 and the second cross rod 5. At this time, the seat frame 2 is lifted relative to the wheel frame 1, and the backrest frame 3 is controlled to fold relative to the seat frame 2. The driving gear 33 rotates the driven gear 34 in the opposite direction, and the pull wire 13 is retracted and released. At this time, the driving rod 25 contacts the pulled force and moves forward. At this time, the first cross rod 4 and the second cross rod 5 rotate, and the seat frame 2 descends relative to the wheel frame 1. The symmetrical layout of the two first cross rods 4 and the second cross rod 5, combined with the lateral fixation of the connecting rod 40, forms a stable geometric frame, which effectively disperses the force, reduces single-point load, and avoids shaking or offset during lifting.

[0040] Preferably, the gear set 10 is further provided with a limiting device, which includes a limiting box 36 and a limiting member 37. The gear set 10 is arranged in the limiting box 36, and the limiting member 37 is connected to the driven gear 34. The limiting member 37 is provided with an abutting hook 38, and the limiting box 36 is provided with a limiting rod 39. When the wheelchair is in a folded state, the limiting member 37 is arranged horizontally to drive the wheelchair to open, and the driving gear 33 drives the driven gear 34 to rotate. The driven gear 34 can drive the limiting member 37 to rotate until the abutting hook 38 jams the limiting rod 39. At this time, the driven gear 34 is restricted from rotating, limiting the opening angle of the backrest frame 3.

[0041] Preferably, the number of the sliding devices is the same as the number of the first cross rods 4. When the first cross rod 4 rotates relative to the second cross rod 5, the sliding device moves along the sliding groove 6. The sliding device is a sliding wheel 7 with low friction and is more stable than the slider.

[0042] Preferably, the wheel frame 1 includes a front base frame 14 and a rear base frame 15 , the lower end of the first cross bar 4 is connected to the rear base frame 15 , and the lower end of the second cross bar 5 is connected to the front base frame 14 .

[0043] Preferably, the front base frame 14 and the rear base frame 15 are further provided with a pair of front wheels 17 and a pair of rear wheels 18, the rear base frame 15 is further provided with an auxiliary rod 19 facing backwards, and an auxiliary wheel 20 is provided at the end of the auxiliary rod 19, the front base frame 14 is further provided with a buffer spring 21, the front base frame 14 is further provided with a pedal 22, and the backrest frame 3 is further rotatably provided with an armrest frame 23, the front end of the armrest frame 23 is provided with an armrest portion 24, and the armrest portion 24 is provided with a control switch.

[0044] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lifting and folding wheelchair, comprising a wheel frame (1), a seat frame (2) and a backrest frame (3), wherein a first cross bar (4) and a second cross bar (5) are provided between the wheel frame (1) and the seat frame (2), wherein the upper ends of the first cross bar (4) and the second cross bar (5) are movably connected to the seat frame (2), and the lower ends are directly or indirectly connected to the wheel frame (1), characterized in that: The middle ends of the first cross rod (4) and the second cross rod (5) are rotatably connected, the upper end of the second cross rod (5) is rotatably arranged at the rear end of the seat frame (2), the front end of the seat frame (2) is provided with a sliding groove (6), the upper end of the first cross rod (4) is provided with a sliding device, the sliding device is arranged in the sliding groove (6), and can move in the sliding groove (6) with the movement of the first cross rod (4), the seat frame (2) is also provided with a driving mechanism (8) and an elastic mechanism, one end of the elastic mechanism is connected to the driving mechanism (8), and the other end is directly or indirectly connected to the first cross rod (4), the driving mechanism (8) can drive the first cross rod (4) and the second cross rod (5) to rotate relative to each other through the elastic mechanism, and when the first cross rod (4) and the second cross rod (5) rotate relative to each other, the wheelchair can be folded or opened.

2. The liftable and foldable wheelchair according to claim 1, characterized in that: The driving mechanism (8) includes a gear set (10) and a driving device (11), and the driving device (11) includes a storage box (12), a pull wire (13) and a driving rod (25). The driving rod (25) is provided with a first insertion hole (26), and the seat frame (2) is provided with a second insertion hole (27) adapted to the first insertion hole (26). The pull wire (13) passes through the second insertion hole (27) and the first insertion hole (26). One end of the pull wire (13) is provided with a limiting portion (28) for limiting the pull wire (13) from being separated from the first insertion hole (26), and the other end is connected to the storage box (12). The driving rod (25) is provided with a connecting seat (29), and one end of the elastic mechanism is connected to the connecting seat (29).

3. The liftable and foldable wheelchair according to claim 2, characterized in that: The seat frame (2) is further provided with a guide rod (30), the guide rod (30) is provided with a guide groove (31), the end of the driving rod (25) is arranged in the guide groove (31) and can slide along the guide groove (31).

4. A liftable and foldable wheelchair according to claim 2 or 3, characterized in that: The driving device (11) comprises a transmission rod (32), a driving gear (33) and a driven gear (34) arranged on the transmission rod (32); both ends of the transmission rod (32) are connected to the backrest frame (3); the driving gear (33) and the driven gear (34) are engaged with each other; when the backrest frame (3) is driven to be opened or folded relative to the seat frame (2), the backrest frame (3) can drive the driving gear (33) to rotate via the transmission rod (32), thereby driving the driven gear (34) to rotate; a linkage rod (35) is provided on the storage box (12); and the storage box (12) is rotationally connected to the driven gear (34) via the linkage rod (35).

5. The liftable and foldable wheelchair according to claim 4, characterized in that: The elastic mechanism is a tension spring (9), one end of the tension spring (9) is connected to the connecting seat (29), and the other end is directly or indirectly connected to the first cross rod (4).

6. The liftable and foldable wheelchair according to claim 5, characterized in that: There are two first cross rods (4) and two second cross rods (5). A connecting rod (40) is provided between the two first cross rods (4). The connecting rod (40) is also provided with the connecting seat (29). The two ends of the tension spring (9) are respectively connected to the connecting seat (29) on the driving rod (25) and the connecting seat (29) on the connecting rod, driving the backrest frame (3) to rotate and open relative to the seat frame (2). The transmission rod (32) drives the driving gear (33) to rotate, so that the driven gear (34) rotates. When the driven gear (34) rotates, the storage box (12) rotates with the driven gear (34) to tighten the pull wire (13). When the pull wire (13) is pulled, the driving rod (25) can be driven to move backward. The driving rod (25) moves backward and pulls the connecting rod (40) through the tension spring (9), thereby rotating the first cross rod (4) and the second cross rod (5). At this time, the seat frame (2) is lifted relative to the wheel frame (1), and the backrest frame (3) is folded relative to the seat frame (2). The driving gear (33) rotates the driven gear (34) in the opposite direction, and the pull wire (13) is retracted and released. At this time, the driving rod (25) contacts the pulled force and moves forward. At this time, the first cross rod (4) and the second cross rod (5) rotate, and the seat frame (2) descends relative to the wheel frame (1).

7. The liftable and foldable wheelchair according to claim 4, characterized in that: The gear set (10) is further provided with a limiting device, which includes a limiting box (36) and a limiting member (37). The gear set (10) is arranged in the limiting box (36). The limiting member (37) is connected to the driven gear (34). The limiting member (37) is provided with an abutting hook (38). The limiting box (36) is provided with a limiting rod (39). When the wheelchair is in a folded state, the limiting member (37) is arranged horizontally to drive the wheelchair to open, and the driving gear (33) drives the driven gear (34) to rotate. The driven gear (34) can drive the limiting member (37) to rotate until the abutting hook (38) blocks the limiting rod (39). At this time, the driven gear (34) is restricted from rotating.

8. The liftable and foldable wheelchair according to claim 1, characterized in that: The number of the sliding devices is the same as the number of the first cross bars (4). When the first cross bar (4) rotates relative to the second cross bar (5), the sliding devices move along the sliding grooves (6). The sliding devices are sliding wheels (7).

9. The liftable and foldable wheelchair according to claim 8, characterized in that: The wheel frame (1) comprises a front base frame (14) and a rear base frame (15), the lower end of the first cross rod (4) is connected to the rear base frame (15), and the lower end of the second cross rod (5) is connected to the front base frame (14).

10. The liftable and foldable wheelchair according to claim 9, characterized in that: The front chassis (14) and the rear chassis (15) are also provided with a pair of front wheels (17) and a pair of rear wheels (18); the rear chassis (15) is also provided with an auxiliary rod (19) facing backwards, and an auxiliary wheel (20) is provided at the end of the auxiliary rod (19); the front chassis (14) is also provided with a buffer spring (21); the front chassis (14) is also provided with a pedal (22); the backrest frame (3) is also rotatably provided with an armrest frame (23); the front end of the armrest frame (23) is provided with an armrest portion (24); and the armrest portion (24) is provided with a control switch.

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