wheelchair

Abstract

The utility model provides a kind of wheelchair.The wheelchair includes backrest frame, handrail and connecting seat, the backrest frame has vertical pole, the handrail is connected to the vertical pole by the connecting seat;The connecting seat includes: seat body, it has through-hole, with the through-hole intercommunication's slot, first clamping arm and second clamping arm, the vertical pole is worn in the through-hole, the first clamping arm and second clamping arm are formed in the lateral opposite sides of the slot;And, locking piece, it movably connects the first clamping arm and second clamping arm, and has the locking state of tightening the slot and the relaxation state of loosening the slot;In the relaxation state, the seat body can vertically slide on the vertical pole;In the locking state, the seat body is fixed on the vertical pole.Such, it can make that connecting seat and backrest frame have slidable state or locking fixed state, and then facilitate handrail height adjustment, to adapt to the needs of different users.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a wheelchair. Background Technology

[0002] A wheelchair is a device used to help people with mobility impairments move around. It provides body support and balance, allowing users to move independently indoors or outdoors.

[0003] The wheelchair frame includes a seat frame, a backrest frame, and armrests. The seat frame is used to mount a cushion for the user to sit on. The backrest frame is used to mount a backrest for the user to lean against. Armrests are used to attach to the seat frame or backrest frame to support the user's arms.

[0004] However, the armrest height of existing wheelchairs is difficult to adjust, making it impossible to cater to the different needs of users. Utility Model Content

[0005] To address the problem of difficulty in adjusting armrest height, the purpose of this utility model is to provide a wheelchair.

[0006] To achieve the above objectives, one embodiment provides a wheelchair. The wheelchair includes a frame, the frame including a backrest, armrests, and a connecting seat, the backrest having a vertical bar, and the armrests being connected to the vertical bar via the connecting seat;

[0007] The connector includes:

[0008] A base having a through hole, a slot communicating with the through hole, a first clamping arm, and a second clamping arm, wherein the vertical rod passes through the through hole, and the first clamping arm and the second clamping arm are formed on opposite sides of the slot in the lateral direction; and,

[0009] A locking element is movably connected to the first clamping arm and the second clamping arm, and has a locked state that tightens the slot and a relaxed state that loosens the slot; in the relaxed state, the seat can slide vertically on the vertical rod; in the locked state, the seat is fixed on the vertical rod.

[0010] As a further preferred embodiment, the locking member includes:

[0011] An eccentric wheel is located on the side of the first clamping arm opposite to the second clamping arm; and,

[0012] A connecting rod having a first end and a second end that are laterally opposed, the first end being rotatably connected to the eccentric wheel about the spindle of the eccentric wheel, and the second end passing through a through hole on the first clamping arm and being connected to the second clamping arm.

[0013] As a further preferred embodiment, the second clamping arm has a threaded hole, and the second end of the connecting rod is threaded into the threaded hole;

[0014] Alternatively, the second clamping arm has a mounting hole, and the connecting seat further includes a nut, with the second end of the connecting rod passing through the mounting hole and threaded onto the nut.

[0015] As a further preferred embodiment, the vertical rod has a plurality of holes or slots spaced apart; the base has a receiving cavity that communicates with the through hole;

[0016] The connecting seat also includes a resilient pin disposed in the receiving cavity;

[0017] The end of the elastic pin protrudes into the through hole and is embedded in the hole or groove;

[0018] When the seat slides on the vertical rod, the elastic pin is pressed against the vertical rod and disengages from the hole or slot.

[0019] As a further preferred embodiment, the frame also includes a front wheel frame, a rear wheel frame, a seat frame, and a pivot assembly;

[0020] The backrest frame, seat frame, front wheel frame, and rear wheel frame are linked together by the pivot assembly to allow the frame to change between an unfolded state and a folded state.

[0021] The handrail and the connecting seat are rotatably connected via a fifth rotating shaft;

[0022] During the transition from the unfolded state to the folded state, the front wheel frame contacts the armrest to push the armrest to rotate relative to the backrest frame around the fifth pivot.

[0023] As a further preferred embodiment, the skeleton has an intermediate state between the unfolded state and the folded state;

[0024] During the transition from the unfolded state to the intermediate state, the backrest frame, seat frame, front wheel frame, and rear wheel frame are linked together through the pivot assembly, and the armrest does not contact the front wheel frame and does not rotate relative to the backrest frame.

[0025] During the transition from the intermediate state to the folded state, the backrest frame, seat frame, front wheel frame, and rear wheel frame continue to move in tandem through the pivot assembly, and the armrest rotates relative to the backrest frame around the fifth pivot under the push of the front wheel frame.

[0026] As a further preferred embodiment, one of the handrail and the connecting seat is provided with a guide groove, and the other is provided with a guide post;

[0027] The guide groove is an arc-shaped groove surrounding the fifth rotating axis;

[0028] The guide post is inserted into the guide groove and moves between the two ends of the arc of the guide groove;

[0029] In the unfolded state, the guide post is located at one end of the arc of the guide groove; in the folded state, the guide post is located at the other end of the arc of the guide groove.

[0030] As a further preferred embodiment, the wheelchair also includes:

[0031] Front and rear wheels;

[0032] Assisted rollers;

[0033] The bracket has a first end and a second end that are arranged opposite to each other; the first end is rotatably connected to the assist roller, and the second end is rotatably connected to the lower front part of the frame about the assist shaft. The bracket is further defined by a pin mechanism to form a first locking position, a second locking position and a third locking position that are fixed relative to the frame.

[0034] When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel;

[0035] When in the second and third positions, the bracket drives the assist roller to extend below the bottom plane, and the third position is located on the side of the second position away from the first position along the rotation path.

[0036] As a further preferred embodiment, the wheelchair also includes:

[0037] Front and rear wheels;

[0038] The bracket has a first end and a second end that are arranged opposite to each other; the second end is rotatably connected to the lower front part of the frame about a power-assisted pivot, and the bracket is defined by a pin mechanism to have a first locking position and a second locking position that are fixed relative to the frame.

[0039] The assisting roller includes a sub-bracket and three wheels. The sub-bracket is rotatably connected to the first end of the bracket around a central axis. The three wheels are all rotatably connected to the sub-bracket and are evenly arranged circumferentially around the central axis.

[0040] When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel;

[0041] When in the second locking position, the bracket drives the assist roller to extend below the bottom plane.

[0042] As a further preferred embodiment, the wheelchair further includes front wheels, rear wheels, and an anti-tilt assembly. The anti-tilt assembly is rotatably connected to the frame about an anti-tilt pivot and has an anti-tilt position and a support position that are fixed relative to the frame. When in the anti-tilt position, the anti-tilt assembly extends beyond the rear of the rear wheel; when in the support position, the anti-tilt assembly extends beyond the rear of the rear wheel.

[0043] Positioning pins and positioning holes, one of which is located on the anti-tilt assembly, and the other is located on the frame; and,

[0044] An elastic element is disposed between the anti-tilt assembly and the frame;

[0045] When in the anti-tilt position, the positioning pin and positioning hole engage to prevent the anti-tilt assembly and the frame from rotating relative to each other, and the elastic element applies an elastic force to the anti-tilt assembly toward the support position.

[0046] Compared with the prior art, the beneficial effect of one embodiment of this utility model is that by setting a connecting seat between the armrest and the backrest frame, and through the cooperation of the seat body (especially the through hole, slot, first clamping arm and second clamping arm) and the locking member of the connecting seat, the connecting seat and the backrest frame can be in a sliding state or a locked and fixed state, thereby facilitating the adjustment of the armrest height to meet the needs of different users. Attached Figure Description

[0047] Figure 1 This is a side view of a wheelchair according to one embodiment;

[0048] Figure 2 This is a structural schematic diagram of the backrest frame, armrests, and connecting base according to one embodiment;

[0049] Figure 3 yes Figure 2 Partial disassembly diagram of the G region;

[0050] Figure 4 yes Figure 2 Side view of region G in the middle;

[0051] Figure 5 yes Figure 4 Cross-sectional view of the DD line;

[0052] Figure 6 yes Figure 4 Cross-sectional view of the EE line;

[0053] Figure 7 This is an anatomical diagram of the handrail and connecting seat according to one embodiment;

[0054] Figure 8is a perspective structural view of a wheelchair according to one embodiment, wherein the exemplary wheelchair is in an unfolded state;

[0055] Figure 9 is a side view of the wheelchair according to one embodiment in an intermediate state;

[0056] Figure 10 is a side view of the wheelchair according to one embodiment in a folded state, wherein the exemplary power assist mechanism is at a first clamping position;

[0057] Figure 11 is a side view of the wheelchair according to one embodiment in a folded state, wherein the exemplary power assist mechanism is at a second clamping position;

[0058] Figure 12 is a side view of the wheelchair according to one embodiment in a folded state, wherein the exemplary power assist mechanism is at a third clamping position;

[0059] Figure 13 is Figure 8 a partially enlarged view of region H in;

[0060] Figure 14 is Figure 8 a variation view of the anti-tilting assembly in region H when the anti-tilting assembly is at the supporting position. DETAILED DESCRIPTION

[0061] Hereinafter, the present application will be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are only used to illustrate the present utility model, and do not limit the scope of the present application. All modifications in structure, method or function made by those of ordinary skill in the art based on these embodiments are included in the protection scope of the present application.

[0062] In the respective drawings of the present application, for convenience of illustration, some dimensions of structures or parts are exaggerated relative to other structures or parts, and therefore, are only used to illustrate the basic structure of the subject matter of the present application.

[0063] Referring to Figure 1 , an embodiment of the present utility model provides a wheelchair 100.

[0064] The wheelchair 100 comprises a frame, and the frame comprises a backrest frame 11, armrests 15 and a connecting base 80.

[0065] The backrest frame 11 can be used for mounting a back cushion for a user's back to lean against.

[0066] The armrests 15 can be used for a user to support arms.

[0067] The number of the armrests 15 can be set to two, which are respectively located on the left and right sides of the frame.

[0068] In this application, the backrest frame 11 has a vertical rod, and the armrest 15 is connected to the vertical rod via a connecting seat 80.

[0069] Furthermore, the armrest 15 can be moved vertically along the vertical rod via the connecting seat 80 to adjust the height of the armrest 15, thereby meeting the needs of different users.

[0070] Specifically, refer to Figures 2 to 6 The connecting seat 80 includes a seat body 81.

[0071] The base 81 has a through hole 810, a slot 8102 communicating with the through hole 810, a first clamping arm 811 and a second clamping arm 812.

[0072] The vertical rod passes through the through hole 810, so that the seat 81 is fitted onto the vertical rod.

[0073] The first clamping arm 811 and the second clamping arm 812 are formed on opposite sides of the slot 8102. Thus, the slot 8102 allows the first clamping arm 811 and the second clamping arm 812 to move relative to each other, for example, moving closer or further apart, thereby tightening or loosening the slot 8102. This, in turn, causes a corresponding change in the size of the through hole 810.

[0074] The connecting seat 80 also includes a locking element 82.

[0075] The locking member 82 is movably connected to the first clamping arm 811 and the second clamping arm 812, and has a locked state with the slot 8102 tightened and a relaxed state with the slot 8102 loosened.

[0076] In the relaxed state, the slot 8102 is loosened, thereby causing the size of the through hole 810 to be appropriately enlarged, and the seat 81 can slide vertically on the vertical rod.

[0077] In the locked state, the slot 8102 is tightened, thereby limiting the size of the through hole 810 and preventing it from expanding, thus fixing the seat 81 to the vertical rod.

[0078] Thus, by providing a connecting seat 80 between the armrest 15 and the backrest frame 11, and through the cooperation of the seat body 81 of the connecting seat 80 (especially the through hole 810, the slot 8102, the first clamping arm 811 and the second clamping arm 812) and the locking member 82, the connecting seat 80 and the backrest frame 11 can be in a sliding state or a locked and fixed state, thereby facilitating the adjustment of the height of the armrest 15 to meet the needs of different users.

[0079] Furthermore, the locking element 82 includes an eccentric wheel 822 and a connecting rod 823.

[0080] The eccentric wheel 822 is located on the side of the first clamping arm 811 opposite to the second clamping arm 812.

[0081] Link 823 has a first end and a second end that are laterally opposite each other.

[0082] The first end 8231 is rotatably connected to the eccentric wheel 822. Specifically, it is rotatably connected to the eccentric wheel 822 about the spindle of the eccentric wheel 822. That is, when the first end 8231 and the eccentric wheel 822 rotate relative to each other about the spindle of the eccentric wheel 822, the eccentric wheel 822 rotates eccentrically.

[0083] The second end passes through the through hole 8130 on the first clamping arm 811 and is connected to the second clamping arm 812.

[0084] Thus, when the height of the handrail 15 needs to be adjusted, the eccentric wheel 822 can be rotated to make the locking member 82 in the relaxed state, so that the connecting seat 80 can drive the handrail 15 to slide along the vertical rod; after the height of the handrail 15 is adjusted to the correct position, the eccentric wheel 822 can be rotated to make the locking member 82 in the locked state, thereby fixing the relative positions of the connecting seat 80 and the vertical rod.

[0085] Preferably, the side of the first clamping arm 811 opposite to the second clamping arm 812 has a groove 813 to stabilize the position of the eccentric wheel 822.

[0086] An eccentric wheel 822 is fixedly connected to a handle 821 for easy operation by the user. The eccentric wheel 822 and the handle 821 are integrated into one piece and constitute an eccentric wrench 820.

[0087] Furthermore, the second clamping arm 812 has a mounting hole, and the connecting seat 80 also includes a nut 84, through which the second end of the connecting rod 823 passes, and then the nut 84 is threadedly connected. This achieves the connection between the second end and the second clamping arm 812.

[0088] Of course, in a variation embodiment, the second clamping arm 812 may have a threaded hole, and the second end of the connecting rod 823 may be threaded into the threaded hole.

[0089] Furthermore, the vertical rod has a plurality of holes or slots 111 spaced apart.

[0090] The seat 81 has a receiving cavity 8101, which is connected to the through hole 810.

[0091] Correspondingly, the connecting seat 80 also includes an elastic pin 83 disposed in the receiving cavity 8101, which enables positioning during height adjustment.

[0092] Specifically, the end of the elastic pin 83 protrudes into the through hole 810 and is embedded in the hole or groove 111. When the seat 81 slides on the vertical rod, the elastic pin 83 is pressed against the vertical rod and disengages from the hole or groove 111. When the receiving cavity 8101 is aligned with the hole or groove 111, the end of the elastic pin 83 is embedded in the hole or groove 111 under its own elastic force.

[0093] In one embodiment, the resilient pin 83 includes an elastomer 832 and a ball 831, the ball 831 forming the end of the resilient pin 83 and being able to be inserted into a hole or groove 111 under the drive of the elastomer 831.

[0094] Furthermore, in this application, the armrest 15 can be integrally fixed with the seat 81, or it can be separately installed from the seat 81.

[0095] In the preferred embodiment shown in the accompanying drawings, the reference... Figure 7 The armrest 15 and the seat 81 are separate components, and the armrest 15 is designed to be rotatably connected to the connecting seat 80 via the fifth pivot 195. This allows the armrest 15 to be easily unfolded or folded as needed.

[0096] The wheelchair 100 also includes front wheels 20 and rear wheels 30.

[0097] The number of front wheels 20 is set to a pair, which are rotatably connected to the lower front part of the frame.

[0098] The number of rear wheels 30 is set to a pair, which are rotatably connected to the lower rear part of the frame.

[0099] When the wheelchair 100 is configured as an electric wheelchair, the rear wheel 30 can be configured as a drive wheel.

[0100] In one embodiment, the front wheel 20 and the rear wheel 30 can jointly define the bottom plane T of the wheelchair 100, which is a virtual plane.

[0101] If the wheelchair 100 is placed on the support platform and the front wheels 20 and rear wheels 30 are in contact with the support platform, the bottom plane T will also overlap with the support platform.

[0102] In this application, it is understood that the bottom plane T defined by the front wheel 20 and the rear wheel 30 is used as a reference, and the front-back and left-right directions are parallel to the bottom plane T; the height / vertical direction is perpendicular to the bottom plane T. It should be noted that in this application, only the bottom plane T is used to define the concepts of front-back, left-right, height, and vertical of the wheelchair 100, and the bottom plane T is not the same as the horizontal ground.

[0103] More preferably, in one embodiment, the reference Figures 8 to 10 The wheelchair 100 is configured as a foldable wheelchair 100, but of course, this application is not limited to this.

[0104] In this embodiment, the frame of the wheelchair 100 has an unfolded state and a folded state. It can be understood that... Figure 8 As shown, in its unfolded state, the frame can be used by a user to sit on; as Figure 10 As shown, in the folded state, the user cannot sit directly on the frame.

[0105] More specifically, the frame also includes a seat frame 12, a front wheel frame 13, a rear wheel frame 14, and a pivot assembly.

[0106] The seat frame 12 can be used to install a seat cushion for users to sit on.

[0107] The front part of the front wheel frame 13 is rotatably connected to the front wheel 20, for example, it can be rotatably connected about the front axle.

[0108] The rear part of the rear wheel frame 14 is rotatably connected to the rear wheel 30, for example, it can be rotatably connected around the rear axle.

[0109] When the wheelchair 100 is configured as an electric wheelchair, the rear wheel frame 14 may also integrate a power supply and a drive motor. Of course, this application is not limited to this.

[0110] The backrest frame 11, seat frame 12, front wheel frame 13 and rear wheel frame 14 are linked by the pivot assembly to allow the frame to change between an unfolded state and a folded state.

[0111] In this application, the armrest 15 may also move in conjunction with the frame during the folding process of the frame.

[0112] Specifically, as mentioned above, refer Figure 7 The rear part 150 of the armrest 15 is rotatably connected to the connecting seat 80 via the fifth rotating shaft 195, thereby realizing the rotation relative to the backrest frame 11.

[0113] During the transition from the unfolded state to the folded state, such as Figure 9 As shown, the front wheel frame 13 contacts the armrest 15 to push the armrest 15 to rotate relative to the backrest frame 11 around the fifth pivot 195.

[0114] Thus, during the process of the frame changing from the unfolded state to the folded state, there is no need to manually fold the armrest 15. The armrest 15 can be directly folded by the push of the front wheel frame 13, making the folding operation of the entire wheelchair 100 more convenient and simple.

[0115] Furthermore, the front part of the front wheel frame 13 has a pusher 131.

[0116] Specifically, the propulsion part 131 can be constructed as a high-strength flat surface or protrusion at the front of the front wheel frame 13.

[0117] The front part of the handrail 15 has a load-bearing part.

[0118] The force-bearing part can be specifically constructed as a flat surface, a pointed tip, or a protrusion on the lower front side of the handrail 15.

[0119] The pushing part 131 and the force-receiving part are positioned opposite each other. When the frame changes from the unfolded state to the folded state, the pushing part 131 contacts the force-receiving part to push the armrest 14 to rotate upward relative to the backrest frame 11 around the fifth pivot 195.

[0120] In one embodiment, the skeleton further has an intermediate state between the unfolded state and the folded state, such as... Figure 9 As shown.

[0121] During the transition from the unfolded state to the intermediate state, that is, from... Figure 8 State change to Figure 9 Before the initial folding, the backrest frame 11, seat frame 12, front wheel frame 13 and rear wheel frame 14 are linked by the pivot assembly to perform initial folding. The armrest 15 does not contact the front wheel frame 13, that is, the pushing part 131 has not yet contacted the force-bearing part, and the armrest 15 and the backrest frame 11 do not rotate relative to each other.

[0122] During the transition from the intermediate state to the folded state, that is, from... Figure 9 State change to Figure 10 During the folding process, the backrest frame 11, seat frame 12, front wheel frame 13, and rear wheel frame 14 continue to move in tandem through the pivot assembly to complete the folding. The armrest 15 rotates relative to the backrest frame 11 around the fifth pivot under the push of the front wheel frame 13 (specifically, the pusher 131 pushes the armrest 15).

[0123] Re-participation Figure 7 In one embodiment, one of the rear portion 150 of the handrail 15 and the connecting seat 80 is provided with a guide groove 151, and the other is provided with a guide post 85.

[0124] The guide groove 151 is configured as an arc-shaped groove around the fifth rotating axis 195.

[0125] The guide post 85 is inserted into the guide groove 151 and slides between the two ends of the arc of the guide groove 151.

[0126] When unfolded, the guide post 85 is located at one end of the arc of the guide groove 151, so that the armrest 15 is approximately 90° to 110°, for example 100°, with the backrest frame 11. Alternatively, the armrest 15 can be approximately parallel to the seat frame 12 to provide support for the user's arms.

[0127] In the folded state, the guide post 85 moves to the other end of the arc of the guide groove 151, so that the armrest 15 rotates to approximately rest against the side of the frame 110 of the backrest frame 11, in a folded state.

[0128] Next, continue to participate Figure 1 In one embodiment, the rotating shaft assembly includes a first rotating shaft 191, a second rotating shaft 192, a third rotating shaft 193, and a fourth rotating shaft 194.

[0129] The front wheel frame 13 and the rear wheel frame 14 are connected in a cross-shaped rotatable manner via the first rotating shaft 191.

[0130] The rear of the front wheel frame 13 is rotatably connected to the backrest frame 11 (specifically the frame 110) via the second pivot 192.

[0131] The front part of the rear wheel frame 14 is rotatably connected to the seat frame 12 via a third pivot 193.

[0132] The rear of the seat frame 12 is rotatably connected to the backrest frame 11 (specifically the frame 110) via a fourth pivot 194.

[0133] Thus, when the wheelchair 100 needs to be stored, the frame can be changed from an unfolded state to a folded state.

[0134] Specifically, by pushing the backrest frame 11 from back to front, the backrest frame 11 and the seat frame 12 rotate relative to each other via the fourth pivot 194 to gradually fold up. At the same time, the backrest frame 11 and the front wheel frame 13 rotate relative to each other via the second pivot 192, the seat frame 12 and the rear wheel frame 14 rotate relative to each other via the third pivot 193, and the front wheel frame 13 and the rear wheel frame 14 rotate relative to each other via the first pivot 191, so that the backrest frame 11 and the front wheel frame 13, the seat frame 12 and the rear wheel frame 14, and the front wheel frame 13 and the rear wheel frame 14 all gradually fold up.

[0135] Among them, the first rotating shaft 191, the second rotating shaft 192, the third rotating shaft 193 and the fourth rotating shaft 194 are parallel and all extend in the left and right direction.

[0136] Further, see figure Figure 8 The frame also includes a locking mechanism 16.

[0137] The locking mechanism 16 is used to lock the skeleton in the unfolded state.

[0138] Specifically, in the unfolded state, the backrest frame 11 (specifically the frame 110) and the front wheel frame 13 are connected by a locking mechanism 16 to restrict relative rotation between them.

[0139] For example, in the unfolded state, the locking mechanism 16 connects the lower part of the backrest frame 11 and the rear part of the front wheel frame 13 to prevent the lower part of the backrest frame 11 and the rear part of the front wheel frame 13 from moving away from each other, thereby restricting the backrest frame 11 and the front wheel frame 13 from rotating relative to each other about the second pivot 192. In this way, the frame can be locked in the unfolded state.

[0140] Furthermore, the skeleton also includes a second locking mechanism.

[0141] The second locking mechanism is used to lock the skeleton in a folded state.

[0142] Specifically, in the folded state, the front of the seat frame 12 and the front of the front wheel frame 13 are connected by a second locking mechanism to limit them from moving away from each other.

[0143] The locking mechanism 16 and the second locking mechanism can be implemented in any feasible manner in the art. Further details will not be provided in this application.

[0144] Furthermore, participants Figures 10 to 12 The wheelchair 100 also includes 40 assistive devices.

[0145] The assist mechanism 40 is used to provide assistance when moving the wheelchair 100 to a higher place (such as the trunk of a car).

[0146] Specifically, the assist mechanism 40 includes an assist roller 42 and a bracket 41.

[0147] One end of the bracket 41 (e.g.) Figure 11 The lower end of the middle is rotatably connected to a power-assisted roller 42.

[0148] The other end of bracket 41 (e.g.) Figure 11 The upper end of the bracket 41 is rotatably connected to the front of the front wheel frame 13 about the power steering shaft, and the bracket 41 has a first locking position and a second locking position that are fixedly connected to the frame.

[0149] When in the first card position, refer Figure 10 The bracket 41 drives the assist roller 42 to be housed between the front wheel 20 and the rear wheel 30, and is located above the bottom plane T.

[0150] In this way, when the frame is in the unfolded state, the support 41 is in the first locking position, and the front wheel 20 and rear wheel 30 are on the ground, the power assist mechanism 40 does not contact the ground, thus not affecting the normal use of the wheelchair 100.

[0151] When in the second card slot, refer Figure 11 The bracket 41 drives the assist roller 42 to unfold, so that the assist roller 42 extends below the bottom plane T. For example, it can be below (or below the front wheel 20).

[0152] In this way, when the frame is in a folded state and the wheelchair 100 needs to be moved into the trunk of the car, the bracket 41 is in the second locking position, so that the power assist roller 42 contacts the trunk of the car, changing the sliding friction into rolling friction, which makes it easier to move the wheelchair 100 into the trunk, thus saving effort.

[0153] In one embodiment, the bracket 41 also has a third locking position relative to the skeleton.

[0154] When in the third card slot, refer Figure 12 The bracket 41 drives the assist roller 42 to unfold, so that the assist roller 42 extends below the bottom plane T; and the third position is located on the side of the second position away from the first position along the rotation path.

[0155] That is, the third locking position is the position where the bracket 41 rotates further from the first locking position through the second locking position.

[0156] For example, when in the third position, the assist roller 42 extends to the lower front of the front wheel 20.

[0157] In this way, when the frame is in a folded state and the wheelchair 100 needs to be moved into the trunk of the car, the bracket 41 is in the third locking position, which not only allows the power rollers 42 to contact the trunk of the car for easy handling, but also can accommodate taller trunks.

[0158] In other words, by using the second and third locking positions, the bracket 41 can be selectively extended to the second or third locking position for car trunks of different heights, making handling more flexible, convenient, and labor-saving.

[0159] Preferably, the first and second locking positions have a first rotation angle, which is between 70° and 100°. For example, 80°, 85°, 90°, 95°, and 100° are preferred.

[0160] The first and third locking positions have a second rotation angle, which is between 90° and 140°. Preferably, it is between 110° and 140°. For example, it is 110°, 115°, 120°, 125°, 130°, 135°, or 140°.

[0161] The second rotation angle is greater than the first rotation angle.

[0162] Furthermore, the bracket 41 and the frame are connected by a pin mechanism to define the first locking position, the second locking position, and the third locking position.

[0163] For example, the pin mechanism includes three pin holes and a pin.

[0164] Three pin holes are provided on said frame (specifically the front wheel frame 13) and distributed circumferentially around the boosting rotating shaft, wherein the three pin holes respectively correspond to a first locking position, a second locking position and a third locking position.

[0165] The pin shaft is movably arranged on the support 41 in the left-right direction, and the end of the pin shaft can be inserted into one of the three pin holes to limit the relative rotation between the support 41 and said frame (specifically the front wheel frame 13).

[0166] That is, when the pin shaft is inserted into the three pin holes respectively, the support 41 is located at the first locking position, the second locking position and the third locking position respectively.

[0167] Further, the boosting roller 42 comprises a sub-support 422 and three wheels 421. Of course, in a modified embodiment, the boosting roller 42 may be configured as a single-wheel structure.

[0168] As Figure 11 , the sub-support 422 is rotatably connected to the support 41 around a central rotating shaft 420, and the three wheels 421 are each rotatably connected to the sub-support 422 and evenly distributed circumferentially around the central rotating shaft 420.

[0169] In this way, by adopting the structure of three wheels 421, when moving the wheelchair in an uneven trunk, the three wheels 421 alternately contact the trunk, so that the wheelchair 100 moves more smoothly, and the labor-saving effect can be further achieved.

[0170] Further, referring to Figures 13 to 14 , the wheelchair 100 further comprises an anti-tilting assembly 50.

[0171] The anti-tilting assembly 50 is rotatably connected to said frame (specifically the rear wheel frame 14) around an anti-tilting rotating shaft 500, and along the rotation path, the anti-tilting assembly 50 has an anti-tilting position and a supporting position fixed relative to said frame.

[0172] Wherein, referring to Figure 13 , when the anti-tilting assembly 50 is located at the anti-tilting position, the anti-tilting assembly 50 protrudes from the lower rear of the rear wheels 30 and is located above the bottom plane T.

[0173] In this way, when said frame is in the unfolded state, the anti-tilting assembly 50 is adjusted to the anti-tilting position, which does not affect the normal movement of the wheelchair 100, and once the wheelchair 100 tilts backward, the anti-tilting assembly 50 can be supported on the ground, thereby preventing the wheelchair 100 from tipping backward and improving the use safety of the wheelchair 100.

[0174] Referring to Figure 14 , when the anti-tilting assembly 50 is located at the supporting position, the anti-tilting assembly 50 protrudes from the upper rear of the rear wheels 30, and obviously, the anti-tilting assembly 50 is still located above the bottom plane T at this time.

[0175] In this way, when the frame is in a folded state, the anti-tilt component 50 is adjusted to the support position. If the wheelchair 100 is then erected, the rear wheels 30 and the anti-tilt component 50 can be used together to support the wheelchair 100, making it easier to move.

[0176] In one embodiment, the wheelchair 100 further includes a positioning pin 52, a positioning hole 53, and an elastic element.

[0177] One of the positioning pins 52 and the positioning holes 53 is provided on the anti-tilt assembly 50, and the other is provided on the frame.

[0178] Furthermore, the positioning pin 52 and the positioning hole 53 are inserted and engaged to prevent the anti-tilt component 50 from rotating relative to the frame, thereby defining one of the anti-tilt position and the support position.

[0179] An elastic element is disposed between the anti-tilt assembly 50 and the frame, and applies an elastic force to the anti-tilt assembly 50 toward the other of the anti-tilt position and the support position.

[0180] That is, by setting the elastic element, combined with the setting of the positioning pin 52 and the positioning hole 53, the anti-tilt component 50 can be easily changed between the anti-tilt position and the support position. For example, by pulling the positioning pin 52, the anti-tilt component 50 can be released, so that the anti-tilt component 50 can be rotated from one of the anti-tilt position and the support position to the other of the anti-tilt position and the support position.

[0181] For example, in one embodiment, the positioning pin 52 and the positioning hole 53 are engaged to prevent the anti-tilt assembly 50 from rotating relative to the frame, thereby defining the anti-tilt position; the elastic member applies an elastic force to the anti-tilt assembly 50 toward the support position. Thus, when the anti-tilt assembly 50 is in the anti-tilt position, the positioning pin 52 is inserted into the positioning hole 53. At this time, pulling the positioning pin 52 releases the anti-tilt assembly 50, allowing the anti-tilt assembly 50 to rotate from the anti-tilt position to the support position under the drive of the elastic member.

[0182] Of course, in a variation embodiment, the support position can also be defined by the insertion and engagement of the positioning pin 52 and the positioning hole 53, and correspondingly, the elastic element applies an elastic force toward the anti-tilt position to the anti-tilt assembly 50.

[0183] Furthermore, the positioning pin 52 is movably mounted on the anti-tilt assembly 50 or the frame.

[0184] The wheelchair 100 also includes a third elastic element for applying an elastic force to the positioning pin 52 to drive the positioning pin 52 into the positioning hole 53.

[0185] In one embodiment, the positioning pin 52 is movably disposed on the anti-roll component 50, and the positioning hole 53 is disposed on the frame (specifically, the rear wheel frame 14).

[0186] Wheelchair 100 also includes guide surface 55.

[0187] The guide surface 55 is disposed on the frame (specifically on the rear wheel frame 14) and adjacent to the positioning hole 53.

[0188] When the anti-tilt assembly 50 moves from the support position to the anti-tilt position, the guide surface 55 abuts against and pushes the locating pin 52 (e.g., overcoming the elastic force of the second elastic element) to guide the locating pin 52 into the locating hole 53.

[0189] For example, when the locating pin 52 moves to the locating hole 53, driven by the second elastic element, the locating pin 52 moves relative to the anti-tilt assembly 50 so that its end is inserted into the locating hole 53.

[0190] Of course, in alternative embodiments, the positioning pin 52 may be movably disposed on the frame (specifically the rear wheel frame 14), and the positioning hole 53 may be disposed on the anti-roll component 50.

[0191] Furthermore, the anti-tilt assembly 50 includes a support frame 511 and a support wheel 512.

[0192] One end of the support frame 511 is rotatably connected to the frame around the anti-tilt shaft 500, specifically the rear part of the rear wheel frame 14; the other end of the support frame 511 is equipped with a support wheel 512.

[0193] Correspondingly, the positioning pin 52 is movably mounted on the support frame 511, and the third elastic element is mounted between the positioning pin 52 and the support frame 511.

[0194] The elastic element is disposed between the support frame 511 and the frame, specifically between the support frame 511 and the rear wheel frame 14.

[0195] In one embodiment, the support frame 511 has a baffle 5111.

[0196] When the anti-tilt assembly 50 is in the supported position, the baffle 5111 abuts against the frame to limit the anti-tilt assembly 50 from rotating further away from the supported position.

[0197] That is, when the anti-tilt component 50 rotates from the anti-tilt position to the support position, the rotation of the anti-tilt component 50 is stopped and cannot continue to rotate due to the cooperation between the baffle 5111 and the frame.

[0198] In summary, the beneficial effects of this utility model include: by providing a connecting seat 80 between the armrest 15 and the backrest frame 11, and through the cooperation of the seat body 81 of the connecting seat 80 (especially the through hole 810, the slot 8102, the first clamping arm 811 and the second clamping arm 812) and the locking member 82, the connecting seat 80 and the backrest frame 11 can be in a sliding state or a locked and fixed state, thereby facilitating the adjustment of the height of the armrest 15 to meet the needs of different users.

[0199] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0200] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this utility model and are not intended to limit the scope of protection of this utility model. All equivalent implementation methods or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A wheelchair, comprising a frame, the frame including a backrest, armrests, and a connecting seat, the backrest having a vertical bar, the armrests being connected to the vertical bar via the connecting seat; characterized in that, The connector includes: A base having a through hole, a slot communicating with the through hole, a first clamping arm, and a second clamping arm, wherein the vertical rod passes through the through hole, and the first clamping arm and the second clamping arm are formed on opposite sides of the slot in the lateral direction; and, A locking element is movably connected to the first clamping arm and the second clamping arm, and has a locked state that tightens the slot and a relaxed state that loosens the slot; in the relaxed state, the seat can slide vertically on the vertical rod; in the locked state, the seat is fixed on the vertical rod.

2. The wheelchair according to claim 1, characterized in that, The locking element includes: An eccentric wheel is located on the side of the first clamping arm opposite to the second clamping arm; and, A connecting rod having a first end and a second end that are laterally opposed, the first end being rotatably connected to the eccentric wheel about the spindle of the eccentric wheel, and the second end passing through a through hole on the first clamping arm and being connected to the second clamping arm.

3. The wheelchair according to claim 2, characterized in that, The second clamping arm has a threaded hole, and the second end of the connecting rod is threaded into the threaded hole; Alternatively, the second clamping arm has a mounting hole, and the connecting seat further includes a nut, with the second end of the connecting rod passing through the mounting hole and threaded onto the nut.

4. The wheelchair according to claim 1, characterized in that, The vertical rod has a plurality of holes or slots spaced apart; the base has a receiving cavity, which is connected to the through hole. The connecting seat also includes a resilient pin disposed in the receiving cavity; The end of the elastic pin protrudes into the through hole and is embedded in the hole or groove; When the seat slides on the vertical rod, the elastic pin is pressed against the vertical rod and disengages from the hole or slot.

5. The wheelchair according to claim 1, characterized in that, The frame also includes a front wheel frame, a rear wheel frame, a seat frame, and a pivot assembly; The backrest frame, seat frame, front wheel frame, and rear wheel frame are linked together by the pivot assembly to allow the frame to change between an unfolded state and a folded state. The handrail and the connecting seat are rotatably connected via a fifth rotating shaft; During the transition from the unfolded state to the folded state, the front wheel frame contacts the armrest to push the armrest to rotate relative to the backrest frame around the fifth pivot.

6. The wheelchair according to claim 5, characterized in that, The skeleton has an intermediate state between the unfolded state and the folded state; During the transition from the unfolded state to the intermediate state, the backrest frame, seat frame, front wheel frame, and rear wheel frame are linked together through the pivot assembly, and the armrest does not contact the front wheel frame and does not rotate relative to the backrest frame. During the transition from the intermediate state to the folded state, the backrest frame, seat frame, front wheel frame, and rear wheel frame continue to move in tandem through the pivot assembly, and the armrest rotates relative to the backrest frame around the fifth pivot under the push of the front wheel frame.

7. The wheelchair according to claim 5, characterized in that, One of the handrail and the connecting seat is provided with a guide groove, and the other is provided with a guide post; The guide groove is an arc-shaped groove surrounding the fifth rotating axis; The guide post is inserted into the guide groove and moves between the two ends of the arc of the guide groove; In the unfolded state, the guide post is located at one end of the arc of the guide groove; in the folded state, the guide post is located at the other end of the arc of the guide groove.

8. The wheelchair according to claim 1, characterized in that, Also includes: Front and rear wheels; Assisted rollers; The bracket has a first end and a second end that are arranged opposite to each other; the first end is rotatably connected to the assist roller, and the second end is rotatably connected to the lower front part of the frame about the assist shaft; and the bracket is defined by a pin mechanism to have a first locking position, a second locking position and a third locking position that are fixed relative to the frame. When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel; When in the second and third positions, the bracket drives the assist roller to extend below the bottom plane, and the third position is located on the side of the second position away from the first position along the rotation path.

9. The wheelchair according to claim 1, characterized in that, Also includes: Front and rear wheels; The bracket has a first end and a second end that are arranged opposite to each other; the second end is rotatably connected to the lower front part of the frame about a power-assisted rotating shaft, and the bracket is defined by a pin mechanism to have a first locking position and a second locking position that are fixed relative to the frame. The assisting roller includes a sub-bracket and three wheels. The sub-bracket is rotatably connected to the first end of the bracket around a central axis. The three wheels are all rotatably connected to the sub-bracket and are evenly arranged circumferentially around the central axis. When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel; When in the second locking position, the bracket drives the assist roller to extend below the bottom plane.

10. The wheelchair according to claim 1, characterized in that, It also includes a front wheel, a rear wheel, and an anti-roll assembly. The anti-roll assembly is rotatably connected to the frame about an anti-roll pivot and has an anti-roll position and a support position that are fixed relative to the frame. When in the anti-roll position, the anti-roll assembly extends below the rear wheel; when in the support position, the anti-roll assembly extends above the rear wheel. Positioning pins and positioning holes, one of which is located on the anti-tilt assembly, and the other is located on the frame; and, An elastic element is disposed between the anti-tilt assembly and the frame; When in the anti-tilt position, the positioning pin and positioning hole engage to prevent the anti-tilt assembly and the frame from rotating relative to each other, and the elastic element applies an elastic force to the anti-tilt assembly toward the support position.

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