Front wheel driving type stair climbing chair

Abstract

The utility model relates to the technical field of wheelchairs, and provides a front wheel driving type stair climbing chair which comprises a chair frame, and a seat plate and a backrest are arranged on the chair frame. Two groups of obliquely arranged track frames are fixedly mounted at the side rear part of the chair frame; a track is mounted on the track frame; the chair frame is further provided with a stair climbing motor used for driving the two crawler belts to rotate synchronously. Two front wheels are mounted at the front end of the chair frame; a rotating shaft is arranged on the chair frame; the two ends of the rotating shaft are fixedly connected with rear wheel legs respectively, and rear wheels are installed on the rear wheel legs. The front wheel is a driving wheel; and the rear wheel is a driven wheel. Therefore, the front wheels are arranged to be the driving wheels, the wheel tread width is small, and then the turning radius is reduced. The structure of the rear wheels is simplified, spacing is reduced, and access to the door frame is facilitated. When the stair climbing chair steers in a narrow space, one front wheel serves as a turning fulcrum, the back and the side faces of the stair climbing chair have enough space, steering operation is convenient and fast, and safety is good. The front wheel is a driving wheel, so that the risk that the stair climbing chair turns backwards during sudden acceleration is also avoided.

Description

Technical Field

[0001] This utility model belongs to the field of wheelchair technology, and in particular relates to a front-wheel drive stair-climbing chair. Background Technology

[0002] Chinese patent CN2024211970180 discloses a stair-climbing chair with rear wheels as drive wheels and front wheels as swivel wheels. The rear wheels provide driving force, while the front wheels assist in steering. The rear wheels, being drive wheels, require a power cord, resulting in a larger distance between the two rear wheels and increasing the difficulty of entering and exiting doorways. Simultaneously, the chair's center of gravity is close to the back, and the rear wheels as drive wheels increase the risk of tipping over when accelerating forward.

[0003] The large distance between the rear wheels of the stair-climbing chair increases the turning radius. While the rear wheels act as the drive wheels, turning is centered on the inner rear wheel. However, stair-climbing chair users are mostly residents of older apartment buildings with narrow stairwells and numerous obstacles such as water pipes and electricity meters. When turning, the limited space behind their backs requires multiple maneuvers, and the front wheels may extend beyond the stair steps, posing a risk of falling.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] To address the aforementioned shortcomings, this utility model provides a front-wheel drive stair-climbing chair, which solves the technical problems of inconvenience in operation and safety hazards caused by the two rear wheels being the driving wheels and the wheels being relatively wide in existing stair-climbing chairs.

[0006] To address the aforementioned problems, this utility model provides a front-wheel drive stair-climbing chair, comprising a chair frame, on which a seat and a backrest are provided; two sets of inclined track frames are fixedly installed on the rear side of the chair frame; tracks are installed on the track frames; a stair-climbing motor for driving the two tracks to rotate synchronously is also installed on the chair frame; and two front wheels are installed at the front end of the chair frame.

[0007] The chair frame is equipped with a pivot; a rear wheel leg is fixed to each end of the pivot, and a rear wheel is mounted on the rear wheel leg; the front wheel is the driving wheel; the rear wheel is the driven wheel;

[0008] The stair-climbing chair has both a flat-ground walking posture and a stair-step walking posture;

[0009] In the flat ground walking posture, both the front and rear wheels are in contact with the flat ground, jointly supporting the stair climbing chair to walk on the flat ground;

[0010] In the stair-walking posture, the tracks contact the stair steps, driving the stair-climbing chair to walk along the stair steps; both the front and rear wheels disengage from the stair steps.

[0011] A rear swing mechanism is also installed below the seat plate; the rear swing mechanism is configured to drive the two rear wheel legs to swing relative to the track frame, switching the walking posture; specifically:

[0012] When the stair-climbing chair switches from a flat-ground walking posture to a step-walking posture, the track frame tilts backward, the track contacts the flat ground, and the front wheel lifts up and loses contact with the flat ground.

[0013] When the stair-climbing chair switches from a stair-walking posture to a flat-ground walking posture, the track frame resets, allowing the front wheels to contact the flat ground, and then the tracks to disengage from the flat ground.

[0014] According to the front-wheel drive stair-climbing chair of this utility model, the rear wheel is an omnidirectional wheel.

[0015] According to the present invention, the front-wheel drive stair-climbing chair includes two wheel legs, one of which is fixedly connected to an auxiliary swing arm; one end of the two wheel legs is connected to the rear wheel, and the other end is fixedly connected to a bushing; the bushing is fixedly sleeved on the rotating shaft.

[0016] According to the front-wheel drive stair-climbing chair of this utility model, the rearward end of the track frame has an upward bending structure; the track frame is also equipped with a pressing wheel for pressing the track.

[0017] According to the present invention, a front-wheel drive stair-climbing chair has a battery box installed on the rear side of the backrest; armrests are provided on both sides of the chair frame; and control buttons are provided on the armrests.

[0018] According to the front-wheel drive stair-climbing chair of this utility model, the rear swing mechanism includes a drive frame and a tilting electric cylinder mounted on the chair frame, wherein the telescopic part of the tilting electric cylinder is rotatably connected to the drive frame.

[0019] The drive frame includes a crossbeam; an auxiliary swing arm is fixed to each end of the crossbeam, and a main swing arm is fixed to the crossbeam between the two auxiliary swing arms; the main swing arm is fixed to the rotating shaft; and the auxiliary swing arms are fixed to the rear wheel leg.

[0020] According to the front-wheel drive stair-climbing chair of this utility model, the rear swing mechanism further includes an assist spring; the two ends of the assist spring are respectively fixed to the chair frame and the crossbeam.

[0021] According to the front-wheel drive stair-climbing chair of this utility model, the assisting element is a spring or an elastic band.

[0022] According to the front-wheel drive stair-climbing chair of this utility model, the auxiliary swing arm is rotatably connected to the rotating shaft; the auxiliary swing arm is fixedly connected to the bearing seat; and the bearing seat is provided with a bearing that is connected to the rotating shaft.

[0023] According to the front-wheel drive stair-climbing chair of this utility model, the rear swing mechanism includes two wheel frames, which are respectively fixedly connected to the two ends of the rotating shaft; a connecting rod is fixedly connected between the two wheel frames; and the rear wheel leg is fixedly connected to the wheel frame.

[0024] It also includes a tilting electric cylinder installed on the chair frame, the telescopic part of the tilting electric cylinder being connected to a tilting slider, and the tilting slider being rotatably sleeved on the connecting rod.

[0025] In summary, this invention reduces the wheelbase by designating the front wheels as the driving wheels, thereby reducing the turning radius. Using the rear wheels as driven wheels simplifies the structure and reduces the distance between the two rear wheels, facilitating entry and exit from doorways. When turning in narrow spaces, using one of the front wheels as a turning fulcrum provides sufficient space on the back and sides of the stair-climbing chair, making turning convenient and safe. The driving nature of the front wheels also avoids the risk of the stair-climbing chair tipping over during sudden acceleration. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of the stair-climbing chair of this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of an embodiment of the rear swing mechanism of this utility model;

[0028] Figure 3 yes Figure 2 A partial cross-sectional view of the mid-rear swing mechanism;

[0029] Figure 4 This is a schematic diagram of the structure of an embodiment of the rear swing mechanism of this utility model;

[0030] Figure 5 This is a structural schematic diagram of the climbing preparation posture of this utility model;

[0031] Figure 6 This is a structural schematic diagram of the initial stage of climbing stairs according to this utility model;

[0032] Figure 7 This is a schematic diagram of the structure of this utility model for walking along stair steps;

[0033] Figure 8 This is a structural schematic diagram of the stair-climbing arrival stage of this utility model;

[0034] Figure 9 This is a structural schematic diagram of the reset stage of this utility model;

[0035] Figure 10 This is a schematic diagram of the turning principle of the stair-climbing chair of this utility model;

[0036] Figure 11 This is a schematic diagram illustrating the turning principle of existing stair-climbing chairs;

[0037] In the diagram: 1-Chair frame, 11-Armrest, 12-Control button, 13-Seat plate, 14-Backrest, 15-Side panel; 2-Front wheel, 3-Rear wheel, 31-Wheel leg plate, 32-Busset; 4-Track frame, 41-Track, 42-Pulley, 43-Stair climbing motor; 5-Battery box, 6-Tilting cylinder, 61-Shaft, 611-Transmission key; 62-Crossbeam, 63-Main swing arm, 64-Auxiliary swing arm, 641-Connecting sleeve; 65-Assist spring; 66-Bearing seat; 7-Wheel frame, 71-Connecting rod, 72-Tilting slider; 100-Flat ground. Detailed Implementation

[0038] See Figure 1 This utility model provides a front-wheel drive stair-climbing chair, including a chair frame 1, on which a seat plate 13 and a backrest 14 are provided; two sets of inclined track frames 4 are fixedly installed on the rear side of the chair frame 1; tracks 41 are installed on the track frames 4; a stair-climbing motor 43 for driving the two tracks 41 to rotate synchronously is also installed on the chair frame 1; two front wheels 2 are installed at the front end of the chair frame 1.

[0039] The front wheel 2 is a drive wheel; it is used to drive the stair-climbing chair forward or backward. The front wheel 2 of this utility model can be equipped with a suitable known structural product, such as the structure disclosed in Chinese Patent CN100545029C.

[0040] Combination Figure 2 The chair frame 1 is provided with a pivot 61; a rear wheel leg is fixed to each end of the pivot 61, and a rear wheel 3 is installed on the rear wheel leg;

[0041] The rear wheel 3 is a driven wheel; the rear wheel 3 as a driven wheel simplifies the structure, reduces the distance between the two rear wheels 3, and is beneficial for entering and exiting the door frame.

[0042] The front wheel 2 of this invention is a driving wheel, and the small distance between the two wheels reduces the turning radius.

[0043] As a working method, when the stair-climbing chair of this utility model turns, the two front wheels 2 can rotate in opposite directions, and the turning fulcrum is located between the two front wheels 2, so that the stair-climbing chair can complete the turning by self-rotation, with a small turning radius and flexible turning.

[0044] As a working method, when the stair-climbing chair of this utility model turns, the two front wheels 2 can rotate quickly to achieve steering.

[0045] Combination Figure 10When turning in narrow spaces such as stair corners, the stair-climbing chair uses one of its front wheels (2) as a turning fulcrum. Sufficient space on its back and sides prevents the chair from colliding with the wall after turning, making turning easy. Furthermore, during the turning process, the user only needs to ensure a safe distance between the front wheel (2) and the stair step. Without assistance, the rider can complete the turning operation independently. This reduces the difficulty of turning and improves safety.

[0046] See Figure 11 The existing stair-climbing chair has three rear wheels as its drive wheels. When turning in the same narrow space:

[0047] If the stair-climbing chair uses one of its rear wheels (3) as a turning pivot point, the back and outer side of the chair are prone to colliding with the wall, requiring multiple adjustments to complete the turn, which increases the difficulty of operation.

[0048] If the existing stair-climbing chair uses two rear wheels 3 that rotate in opposite directions, placing the turning point between the two rear wheels 3, the front end will move in an arc during rotation, posing a risk that one of the front wheels 2 may fall onto the stair steps, increasing safety hazards. Therefore, before turning, the stair-climbing chair needs to be moved back a sufficient distance on a flat surface 100° to keep the front wheels 2 away from the stair steps. If there is not enough space to move back in the stairwell, assistance from others is required, as it is difficult for the person riding the stair-climbing chair to complete the turning operation independently.

[0049] Preferably, the rear wheel 3 of this invention is an omnidirectional wheel, used to enable the stair-climbing chair to turn. When turning, the stair-climbing chair can rotate on the spot, further reducing the turning radius, allowing it to turn or adjust its orientation in narrow spaces.

[0050] The front wheel 2 of this invention is the driving wheel, which avoids the risk of the stair-climbing chair tipping over when accelerating suddenly.

[0051] The stair-climbing chair of this utility model has both flat ground walking posture and stair walking posture;

[0052] Combination Figure 5 In the flat ground walking posture, both the front wheel 2 and the rear wheel 3 are in contact with the flat ground 100, jointly supporting the stair-climbing chair to walk on the flat ground 100; in this walking posture, the track 41 is out of contact with the flat ground 100.

[0053] See Figure 7 In the stair-walking posture, the track 41 contacts the stair steps, driving the stair-climbing chair to walk along the stair steps; in this walking posture, both the front wheel 2 and the rear wheel 3 are out of contact with the stair steps.

[0054] A rear swing mechanism is also installed below the seat plate 13; the rear swing mechanism is configured to drive the two rear wheel legs to swing relative to the track frame 4, switching the walking posture; specifically:

[0055] Combination Figure 6 When the stair-climbing chair switches from a flat-ground walking posture to a step-walking posture, the track frame 4 tilts backward, the track 41 contacts the flat ground 100, causing the front wheel 2 to lift up and disengage from the flat ground 100; the stair-climbing chair is driven to move by the track 41.

[0056] Combination Figure 9 When the stair-climbing chair switches from a step-walking posture to a flat-ground walking posture, the track frame 4 resets, causing the front wheel 2 to contact the flat ground 100, thereby causing the track 41 to disengage from the flat ground 100.

[0057] As a preferred embodiment, the rearward end of the track frame 4 has an upward bending structure; more preferably, the track frame 4 is also equipped with a pressing roller 42 for pressing the track 41; the pressing roller 42 is located at the bending transition position, so that the track 41 can smoothly complete the bending transition.

[0058] Combined Figure 7 During the process of the stair-climbing chair switching from a flat-ground walking posture to a stair-step walking posture, the front end of the track frame 4 tilts upward to ensure that the track 41 can press on the stair steps; thus smoothly realizing the movement of the track 41 along the stair steps.

[0059] See Figure 8 When the stair-climbing chair reaches the end of the steps, the rear wheels 3 lower and contact the flat ground 100 to prevent the wheelchair from tipping backward sharply when it reaches the top of the steps, which could frighten the passengers. As the stair-climbing chair moves towards the flat ground 100, the rear wheels 3 gradually lower, allowing the wheelchair to rise smoothly and ensuring the safety of the passengers; at the same time, the tracks 41 provide power to propel the stair-climbing chair along the flat ground 100.

[0060] See Figure 9 Once the stair-climbing chair has moved completely onto the flat ground 100, the rear wheel 3 continues to lower, causing the front wheel 2 to re-contact the flat ground 100, thus restoring the walking posture on flat ground.

[0061] As one embodiment, a battery box 5 is installed on the rear side of the backrest 14; armrests 11 are provided on both sides of the chair frame 1; control buttons 12 are provided on the armrests 11; making it convenient for users to operate the stair-climbing chair independently.

[0062] As one embodiment, side baffles 15 are provided on the lower sides of both sides of the seat plate 13; the rear swing mechanism is sealed under the seat plate 13, making the appearance of the stair climbing chair simpler and improving the overall aesthetics; at the same time, it prevents clothing from entering under the seat plate 13 and getting tangled in the moving parts, thus improving safety.

[0063] As one embodiment, the pivot 61 is rotatably mounted on the two track frames 4; this increases the overall load-bearing capacity of the stair-climbing chair and improves its stability.

[0064] See Figure 2 and Figure 3 As an embodiment of the rear swing mechanism of this utility model, the rear swing mechanism includes a drive frame and a tilting electric cylinder 6 mounted on the chair frame 1, wherein the telescopic part of the tilting electric cylinder 6 is rotatably connected to the drive frame.

[0065] The drive frame includes a crossbeam 62; an auxiliary swing arm 64 is fixed at each end of the crossbeam 62, and a main swing arm 63 is fixedly connected to the crossbeam 62 between the two auxiliary swing arms 64; the main swing arm 63 is fixedly connected to the rotating shaft 61; and the auxiliary swing arms 64 are fixedly connected to the rear wheel leg.

[0066] In this invention, the rear wheel legs are fixedly connected to the axle 61 and the drive frame, increasing the number of stress points and improving overall stability. The crossbeam 62 connects the two auxiliary swing arms 64 and the main swing arm 63, improving the load-bearing capacity of the drive frame while reducing the load on the crossbeam 62, thus significantly reducing its cross-sectional area.

[0067] The tilting electric cylinder 6 drives the drive frame to rotate reciprocally, thereby enabling the rear wheel leg to swing back and forth around the pivot 61. Both the auxiliary swing arm 64 and the pivot 61 of this invention are fixedly connected to the rear wheel leg, and they jointly share the driving load of the rear wheel leg. Compared with existing structures, the pivot 61 and the drive frame of this invention jointly bear the torque driving the rear wheel leg to rotate, as well as the bending moment generated by supporting the weight of the stair-climbing chair, thus optimizing the stress structure; at the same time, it significantly reduces the cross-sectional area of ​​the crossbeam 62, reducing weight and cost.

[0068] As one embodiment, the rear swing mechanism further includes an assist spring 65; the two ends of the assist spring 65 are respectively fixed to the chair frame 1 and the crossbeam 62;

[0069] During the reclining of the stair-climbing chair, the telescopic part of the tilting electric cylinder 6 extends; the rear wheel legs swing up, and the power spring 65 extends to store energy.

[0070] When the stair-climbing chair rises and resets, the assist spring 65 contracts and releases its elastic energy, providing assistance to the drive frame and reducing the load on the tilting electric cylinder 6 during retraction.

[0071] Preferably, the assisting element 65 of this utility model is a spring or elastic band, etc.

[0072] As one embodiment, the auxiliary swing arm 64 is rotatably sleeved on the rotating shaft 61, so that the drive frame and the rotating shaft 61 form a stable structure, which optimizes the overall structure and improves the load-bearing capacity.

[0073] Furthermore, the auxiliary swing arm 64 is fixedly connected to the bearing seat 66; the bearing seat 66 is provided with a bearing that is sleeved with the rotating shaft 61; the auxiliary swing arm 64 is rotatably sleeved with the rotating shaft 61 through the bearing, which provides good stability.

[0074] As one embodiment, the rear wheel leg includes two wheel leg plates 31, one of which is fixedly connected to an auxiliary swing arm 64; one end of the two wheel leg plates 31 is connected to the rear wheel 3, and the other end is fixedly connected to a bushing 32; the bushing 32 is fixedly sleeved on the rotating shaft 61;

[0075] Even better, the auxiliary swing arm 64 is fixed to the wheel leg plate 31 via a connecting sleeve 641; the connecting sleeve 641 increases the distance between the auxiliary swing arm 64 and the wheel leg plate 31, leaving installation space so that a side baffle 15 can be installed on the side of the chair frame 1. At the same time, it reduces the length of the crossbeam 62, thereby reducing the bending stress it bears.

[0076] See Figure 4 As an embodiment of the rear swing mechanism of this utility model, the rear swing mechanism includes two wheel frames 7, which are respectively fixedly connected to the two ends of the rotating shaft 61; a connecting rod 71 is fixedly connected between the two wheel frames 7; and the rear wheel leg is fixedly connected to the wheel frame 7.

[0077] It also includes a tilting electric cylinder 6 installed on the chair frame 1, the telescopic part of the tilting electric cylinder 6 is connected to a tilting slider 72, and the tilting slider 72 is rotatably sleeved on the connecting rod 71;

[0078] The tilting electric cylinder 6 controls the reciprocating motion of the tilting slider 72, which in turn drives the two rear wheels 3 to swing back and forth.

[0079] In summary, this utility model provides a front-wheel drive stair-climbing chair. By designating the front wheels as the driving wheels, the wheelbase width is reduced, thereby decreasing the turning radius. Using the rear wheels as driven wheels simplifies the structure and reduces the distance between the two rear wheels, facilitating entry and exit from doorways. When turning in narrow spaces, using one of the front wheels as a turning fulcrum provides sufficient space on the back and sides of the chair, making turning convenient and safe. The driving front wheels also prevent the chair from tipping over during sudden acceleration.

[0080] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A front-wheel drive stair climbing chair, characterized by, The chair frame is provided with a seat plate and a backrest; two groups of inclined track frames are fixedly installed at the rear side of the chair frame; tracks are installed on the track frames; a stair climbing motor is installed on the chair frame for driving the two tracks to rotate synchronously; two front wheels are installed at the front end of the chair frame; A rotating shaft is installed on the chair frame; two rear wheel legs are fixedly connected to the two ends of the rotating shaft, and rear wheels are installed on the rear wheel legs; the front wheels are driving wheels; the rear wheels are driven wheels; The stair climbing chair has a flat ground walking posture and a stair walking posture; In the flat ground walking posture, the front wheels and the rear wheels are in contact with the flat ground to jointly support the stair climbing chair to walk on the flat ground; In the stair walking posture, the tracks are in contact with the stair steps to drive the stair climbing chair to walk along the stair steps; the front wheels and the rear wheels are both out of contact with the stair steps; A rear swing mechanism is further installed below the seat plate; the rear swing mechanism is configured to drive the two rear wheel legs to swing relative to the track frames to switch the walking postures; specifically: When the stair climbing chair is switched from the flat ground walking posture to the stair walking posture, the track frames are inclined backward, the tracks are in contact with the flat ground, and the front wheels are lifted to be out of contact with the flat ground; When the stair climbing chair is switched from the stair walking posture to the flat ground walking posture, the track frames are reset, the front wheels are in contact with the flat ground, and the tracks are out of contact with the flat ground.

2. The front-wheel drive stair climbing chair of claim 1, wherein, The rear wheels are omni-directional wheels.

3. The front-wheel drive stair climbing chair of claim 1, wherein, The rear wheel legs include two wheel leg plates, one of which is fixedly connected to an auxiliary swing arm; one end of the two wheel leg plates is connected to the rear wheel, and the other end is fixedly connected to a shaft sleeve; the shaft sleeve is fixedly sleeved on the rotating shaft.

4. The front-wheel drive stair climbing chair of claim 1, wherein, The end of the track frame towards the rear has an upwardly bent structure; a track pressing wheel is further installed on the track frame.

5. The front-wheel drive stair climbing chair of claim 1, wherein, A battery box is installed on the rear side of the backrest; handrails are provided on the two sides of the chair frame; control knobs are provided on the handrails.

6. The front-wheel-driven stair climbing chair according to any one of claims 1 to 5, wherein The rear swing mechanism includes a driving frame and an inclined electric cylinder installed on the chair frame; the extension part of the inclined electric cylinder is rotatably connected to the driving frame; The driving frame includes a cross beam; one auxiliary swing arm is fixedly arranged at each end of the cross beam; a main swing arm is fixedly connected to the cross beam between the two auxiliary swing arms; the main swing arm is fixedly connected to the rotating shaft; the auxiliary swing arm is fixedly connected to the rear wheel leg.

7. The front-wheel drive stair climbing chair of claim 6, wherein, The rear swing mechanism further includes a power assisting elastic member; the two ends of the power assisting elastic member are fixedly connected to the chair frame and the cross beam.

8. The front-wheel drive stair climbing chair of claim 7, wherein, The power assisting elastic member is a spring or an elastic band.

9. The front-wheel drive stair climbing chair of claim 6, wherein, The auxiliary swing arm is rotatably sleeved on the rotating shaft; the auxiliary swing arm is fixedly connected to a bearing seat; the bearing seat is provided with a bearing sleeved on the rotating shaft.

10. The front-wheel-driven stair climbing chair according to any one of claims 1 to 5, wherein The rear swing mechanism includes two wheel frames, each of which is fixedly connected to one end of the rotating shaft; a connecting frame rod is fixedly connected between the two wheel frames; the rear wheel leg is fixedly connected to the wheel frame; An inclined electric cylinder is further installed on the chair frame; the extension part of the inclined electric cylinder is connected to an inclined sliding block; the inclined sliding block is rotatably sleeved on the connecting frame rod.

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