Rear wheel swing mechanism and stair climbing chair

Abstract

The utility model relates to the technical field of wheelchairs, and provides a rear wheel swinging mechanism which is installed on a 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 rear wheel swinging mechanism comprises a driving frame body and an inclined electric cylinder mounted on the chair frame, and a telescopic part of the inclined electric cylinder is rotationally connected to the driving frame body; the driving frame body comprises a cross beam rod; the two ends of the cross beam rod are each fixedly provided with an auxiliary swing arm, and a main swing arm fixedly connected with the cross beam rod is arranged between the two auxiliary swing arms. The main swing arm is fixedly connected with the spindle; the auxiliary swing arm is fixedly connected with a rear wheel leg. In this way, the auxiliary swing arm and the rotating shaft are fixedly connected with the rear wheel leg, and the auxiliary swing arm and the rotating shaft share the driving load of the rear wheel leg together. Compared with an existing structure, the rotating shaft and the driving frame jointly bear the torque for driving the rear wheel legs to rotate and the bending moment generated by supporting the weight of the stair climbing chair, and the stress structure is optimized; and the sectional area of the cross beam rod is greatly reduced. The utility model further provides a stair climbing chair.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wheelchair technical field, especially relate to a rear wheel swing mechanism and a stair climbing wheelchair. BACKGROUND

[0002] Chinese patent CN2024211970180 or CN2023101723967 respectively discloses a stair climbing wheelchair, both ends of the pivot are connected with a wheel frame respectively, and a walking wheel is installed on the wheel frame; an inclined drive assembly for driving the wheel frame to rotate is installed on the chair frame. Since the wheel frame is fixed on the pivot, the torque required for driving the walking wheel to swing is all applied to the connecting rod; at the same time, the walking wheel also needs to support the weight of the stair climbing wheelchair, and the supporting force generates a bending moment at the wheel frame to bend the pivot to the middle. Therefore, the connecting rod is relatively long, bears a large bending moment, and has a large bending stress, so it needs to have a large cross section or be made of high-strength material, which significantly increases the weight and cost of the connecting rod.

[0003] In summary, the prior art has obvious inconvenience and defects in actual use, and needs to be improved. CONTENT OF THE UTILITY MODEL

[0004] In view of the above defects, the utility model mainly provides a rear wheel swing mechanism to solve the technical problem of unreasonable force structure of the existing stair climbing wheelchair swing mechanism.

[0005] In order to solve the above problems, the utility model provides a rear wheel swing mechanism, which comprises a chair frame, the rear wheel swing mechanism is installed on the chair frame; a pivot is arranged on the chair frame; one rear wheel leg is fixedly connected to each end of the pivot, and a rear wheel is installed on the rear wheel leg;

[0006] The rear wheel swing mechanism comprises a driving frame body and an inclined electric cylinder installed on the chair frame, and the extension part of the inclined electric cylinder is rotatably connected to the driving frame body.

[0007] The driving frame body comprises 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 pivot; and the auxiliary swing arm is fixedly connected to the rear wheel leg.

[0008] According to the rear wheel swing mechanism of the utility model, the rear wheel swing mechanism further comprises a power-assisted elastic member; both ends of the power-assisted elastic member are fixedly connected to the chair frame and the cross beam.

[0009] According to the rear wheel swing mechanism of the utility model, the power-assisted elastic member is a spring or an elastic belt.

[0010] According to the rear wheel swing mechanism of the utility model, the auxiliary swing arm is rotatably sleeved with the pivot.

[0011] The rear wheel swing mechanism of the utility model, bearing seat is fixed to the auxiliary swing arm, the bearing is arranged in the bearing seat and is connected with the rotating shaft sleeve.

[0012] The rear wheel swing mechanism of the utility model, the rear wheel leg includes two pieces of wheel leg plates, one of which is fixed to the auxiliary swing arm, one end of the two wheel leg plates is connected with the rear wheel, and the other end is fixed to the shaft sleeve.

[0013] The utility model provides a stair climbing chair, which has the rear wheel swing mechanism, and comprises a chair frame, a seat plate and a backrest arranged on the chair frame, two groups of track frames arranged at the rear side of the chair frame, tracks arranged on the track frames, a stair climbing motor arranged on the chair frame and used for driving the two tracks to rotate synchronously, two front wheels arranged at the front end of the chair frame, and a battery box arranged at the rear side of the backrest.

[0014] The front wheels of the stair climbing chair are universal wheels or omnidirectional wheels.

[0015] The utility model provides a stair climbing chair, which has the rear wheel swing mechanism, and comprises a chair frame, a seat plate and a backrest arranged on the chair frame, two groups of track frames arranged at the rear side of the chair frame, tracks arranged on the track frames, a stair climbing motor arranged on the chair frame and used for driving the two tracks to rotate synchronously, two front wheels arranged at the front end of the chair frame, and a battery box arranged at the rear side of the backrest.

[0016] The utility model provides a stair climbing chair, which has the rear wheel swing mechanism, and comprises a chair frame, a seat plate and a backrest arranged on the chair frame, two groups of track frames arranged at the rear side of the chair frame, tracks arranged on the track frames, a stair climbing motor arranged on the chair frame and used for driving the two tracks to rotate synchronously, two front wheels arranged at the front end of the chair frame, and a battery box arranged at the rear side of the backrest.

[0017] The utility model provides a stair climbing chair, which has the rear wheel swing mechanism, and comprises a chair frame, a seat plate and a backrest arranged on the chair frame, two groups of track frames arranged at the rear side of the chair frame, tracks arranged on the track frames, a stair climbing motor arranged on the chair frame and used for driving the two tracks to rotate synchronously, two front wheels arranged at the front end of the chair frame, and a battery box arranged at the rear side of the backrest. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic diagram of the stair climbing chair of the utility model;

[0019] Figure 2 It is Figure 1 It is the internal structure schematic diagram of the stair climbing chair;

[0020] Figure 3 It is Figure 2 It is the partial sectional structure schematic diagram of the rear wheel swing mechanism in

[0021] Figure 4 It is the structure schematic diagram of the stair climbing preparation posture of the utility model;

[0022] Figure 5It is the structure schematic view of initial stage of climbing stairs of the utility model;

[0023] Figure 6 It is the structure schematic view of walking along the stair step of the utility model;

[0024] Figure 7 It is the structure schematic view of reaching stage of climbing stairs of the utility model;

[0025] Figure 8 It is the structure schematic view of reset stage of the utility model;

[0026] In the drawing: 1-chair frame, 11-handrail, 12-control knob, 13-seat plate, 14-backrest, 15-side baffle; 2-front wheel, 3-rear wheel, 31-wheel leg plate, 32-axle sleeve; 4-track frame, 41-track, 42-pressing belt wheel, 43-climbing motor; 5-battery box, 6-inclined cylinder, 61-rotating shaft, 611-transmission key; 62-cross beam rod, 63-main swing arm, 64-assistant swing arm, 641-connection sleeve; 65-assistance elastic member; 66-bearing seat; 100-flat ground. DETAILED DESCRIPTION

[0027] Referring to Figure 1 The utility model provides a rear wheel swing mechanism, including chair frame 1, rear wheel swing mechanism installs on chair frame 1,

[0028] Referring to Figure 2 Chair frame 1 is equipped with rotating shaft 61, the both ends of rotating shaft 61 are fixedly connected with rear wheel leg respectively, and rear wheel leg is installed with rear wheel 3,

[0029] Referring to Figure 3 Rear wheel swing mechanism includes drive frame body and the inclined cylinder 6 of installation on chair frame 1, and the telescopic portion of inclined cylinder 6 is rotatably connected on drive frame body,

[0030] Drive frame body includes cross beam rod 62, and the both ends of cross beam rod 62 are fixedly provided with assistant swing arm 64 respectively, and the main swing arm 63 of fixed connection with cross beam rod 62 is equipped between two assistant swing arms 64, main swing arm 63 is fixedly connected with rotating shaft 61, and assistant swing arm 64 is fixedly connected with rear wheel leg,

[0031] The utility model discloses rear wheel leg and rotating shaft 61 and drive frame body are all formed fixed connection, increase the stress point, and the overall stability is high. Cross beam rod 62 connects two assistant swing arms 64 and main swing arm 63, improves the carrying capacity of drive frame body, and simultaneously reduces the load borne by cross beam rod 62, makes its section area greatly reduce.

[0032] The tilt cylinder 6 can drive the driving frame body to reciprocating rotate, and then realize the rear wheel leg to swing around the rotating shaft 61. The auxiliary swing arm 64 and the rotating shaft 61 are fixedly connected with the rear wheel leg, and the driving load of the rear wheel leg is shared by the two. Compared with the prior art, the rotating shaft 61 and the driving frame body of the utility model jointly bear the torque for driving the rear wheel leg to rotate and the bending moment generated by supporting the weight of the stair climbing chair, and the stress structure is optimized. At the same time, the cross section area of the cross beam 62 is greatly reduced, and the weight and cost are reduced.

[0033] As an embodiment, the rear wheel swing mechanism further comprises a power assisting elastic member 65; two ends of the power assisting elastic member 65 are fixedly connected with the chair frame 1 and the cross beam 62 respectively;

[0034] During the folding process of the stair climbing chair, the telescopic part of the tilt cylinder 6 is pushed out; the rear wheel leg swings upward, and the power assisting elastic member 65 is elongated to store energy.

[0035] When the stair climbing chair is raised and reset, the power assisting elastic member 65 is contracted to release the elastic performance, so as to provide power assistance for the driving frame body, and reduce the load of the contraction of the tilt cylinder 6.

[0036] Preferably, the power assisting elastic member 65 of the utility model is a spring or an elastic belt.

[0037] As an embodiment, the auxiliary swing arm 64 is rotatably sleeved with the rotating shaft 61, so that the driving frame body and the rotating shaft 61 form a stable structure, the overall structure is optimized, and the load bearing capacity is improved.

[0038] Further, the auxiliary swing arm 64 is fixedly connected with a bearing seat 66; the bearing seat 66 is provided with a bearing sleeved with the rotating shaft 61; the auxiliary swing arm 64 is rotatably sleeved with the rotating shaft 61 through the bearing, and the stability is good.

[0039] As an embodiment, the rear wheel leg comprises two pieces of leg plates 31, one of which is fixedly connected with the auxiliary swing arm 64; one end of the two leg plates 31 is connected with the rear wheel 3, and the other end is fixedly connected with a shaft sleeve 32; the shaft sleeve 32 is fixedly sleeved with the rotating shaft 61;

[0040] Better, the auxiliary swing arm 64 is fixedly connected with the leg plate 31 through a connecting sleeve 641; the connecting sleeve 641 increases the distance between the auxiliary swing arm 64 and the leg plate 31, leaves installation space, and the side of the chair frame 1 can be provided with a side baffle 15. At the same time, the length of the cross beam 62 is reduced, and the bending stress borne by the cross beam 62 is reduced.

[0041] Referring to Figure 1The utility model also provides a stair -climbing chair, with the rear wheel swing mechanism, including the chair frame 1, be equipped with the seat board 13 and the backrest 14 on the chair frame 1, the rear portion of the chair frame 1 is fixedly installed with two groups of track frame 4 of inclined arrangement, the track frame 4 is installed with track 41, the chair frame 1 still is installed with the stair -climbing motor 43 for driving two tracks 41 synchronous rotation, the front end of the chair frame 1 is installed with two front wheels 2,

[0042] The rear wheel 3 is a driving wheel; for driving the forward movement or backward movement of the stair -climbing chair. The rear wheel 3 of the utility model can be selected and matched with the known structure product, such as the structure disclosed in Chinese patent CN100545029C.

[0043] The front wheel 2 is a driven wheel; optionally, the front wheel 2 of the utility model is a universal wheel or an omnidirectional wheel, for realizing the steering of the stair -climbing chair.

[0044] The stair -climbing chair of the utility model has a flat ground walking posture and a stair walking posture;

[0045] Combined Figure 4 , flat ground walking posture, the front wheel 2 and the rear wheel 3 all contact the flat ground surface 100, and the stair -climbing chair is supported on the flat ground surface 100 together; when the walking posture, the track 41 is in contact with the flat ground surface 100.

[0046] Referring to Figure 6 , stair walking posture, the track 41 contacts the stair step, and drives the stair -climbing chair to walk along the stair step; when the walking posture, the front wheel 2 and the rear wheel 3 are all in contact with the stair step.

[0047] The rear wheel swing mechanism drives the two rear wheels 3 to swing relative to the track frame 4, and switches the walking posture; specifically:

[0048] Combined Figure 5 , the stair -climbing chair is switched from the flat ground walking posture to the stair walking posture, the track frame 4 is inclined rearward, the track 41 contacts the flat ground surface 100, so that the front wheel 2 is lifted and is in contact with the flat ground surface 100; the stair -climbing chair is driven to move by the track 41.

[0049] Combined Figure 8 , the stair -climbing chair is switched from the stair walking posture to the flat ground walking posture, the track frame 4 is reset, so that the front wheel 2 contacts the flat ground surface 100, and then the track 41 is in contact with the flat ground surface 100.

[0050] As a preferred scheme, the end of the track frame 4 towards the rear has an upward bending structure; better, the track frame 4 is also installed with a belt pressing wheel 42 for pressing the track 41; the belt pressing wheel 42 is arranged at the bending transition position, so that the track 41 smoothly completes the bending transition.

[0051] Again combined Figure 6In the process that the stair climbing chair is switched from the walking posture on the flat ground to the walking posture on the steps, the front end of the crawler frame 4 is raised upward to ensure that the crawler belt 41 can be pressed on the stair steps, so that the action of the crawler belt 41 walking along the stair steps is smoothly realized.

[0052] Referring to Figure 7 When the stair climbing chair walks to the end of the steps, the rear wheel 3 is lowered and contacts the flat ground 100, so that the stair climbing chair is prevented from being greatly tilted backward at the top of the steps and the passenger is frightened. In the process that the stair climbing chair moves to the flat ground 100, the rear wheel 3 is gradually lowered, so that the wheelchair is stably lifted to ensure the safety of the passenger. Meanwhile, the rear wheel 3 provides power to pull the wheelchair to move to the flat ground 100, so that the load of the stair climbing motor 43 is reduced.

[0053] Referring to Figure 8 When the stair climbing chair is completely moved to the flat ground 100, the rear wheel 3 is continuously lowered, so that the front wheel 2 contacts the flat ground 100 again and the walking posture on the flat ground is restored.

[0054] As an embodiment, the rear side of the backrest 14 is provided with a battery box 5, the two sides of the chair frame 1 are provided with armrests 11, and the control knobs 12 are arranged on the armrests 11, so that the user can operate the stair climbing chair by himself.

[0055] As an embodiment, the lower sides of the two sides of the seat plate 13 are provided with side plates 15, the rear wheel swing mechanism is enclosed under the seat plate 13, the appearance of the stair climbing chair is more simple, the overall aesthetic feeling is improved, and the safety is improved because clothes are prevented from entering under the seat plate 13 and being entangled by the moving parts.

[0056] As an embodiment, the rotating shaft 61 is rotatably arranged on the two crawler frames 4, so that the overall bearing capacity of the stair climbing chair is increased and the stability is improved.

[0057] In summary, the rear wheel swing mechanism is provided, the auxiliary swing arm and the rotating shaft are fixedly connected with the rear wheel leg, and the driving load of the rear wheel leg is shared by the auxiliary swing arm and the rotating shaft. Compared with the prior art, the rotating shaft and the driving frame body of the utility model jointly bear the torque for driving the rear wheel leg to rotate and the bending moment generated by supporting the weight of the stair climbing chair, the stress structure is optimized, the cross beam rod is greatly reduced in sectional area, the weight and the cost are reduced, and the stair climbing chair is provided.

[0058] Of course, the utility model also has other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the utility model without departing from the spirit and essence of the utility model, but these corresponding changes and modifications should all belong to the protection scope of the claims attached to the utility model.

Claims

1. A rear wheel swing mechanism comprising a chair frame on which the rear wheel swing mechanism is mounted; characterized by, The chair frame is provided with a rotating shaft; two rear wheel legs are fixedly connected to the two ends of the rotating shaft, and a rear wheel is installed on each rear wheel leg; The rear wheel swinging mechanism comprises a driving frame and an inclined electric cylinder installed on the chair frame, and the telescopic part of the inclined electric cylinder is rotatably connected to the driving frame; The driving frame comprises a cross beam; two auxiliary swinging arms are fixedly arranged at the two ends of the cross beam, and a main swinging arm is fixedly connected to the cross beam between the two auxiliary swinging arms; the main swinging arm is fixedly connected to the rotating shaft; and the auxiliary swinging arms are fixedly connected to the rear wheel legs.

2. The rear wheel swing mechanism according to claim 1, characterized by A booster spring is further included, and the two ends of the booster spring are fixedly connected to the chair frame and the cross beam.

3. The rear wheel swing mechanism according to claim 2, wherein The booster spring is a spring or an elastic band.

4. The rear wheel swing mechanism according to claim 1, wherein The auxiliary swinging arms are rotatably sleeved with the rotating shaft.

5. The rear wheel swing mechanism according to claim 4, wherein A bearing seat is fixedly connected to the auxiliary swinging arm, and a bearing is arranged in the bearing seat and sleeved with the rotating shaft.

6. The rear wheel swing mechanism according to claim 1, wherein The rear wheel leg comprises two wheel leg plates, one of which is fixedly connected to the auxiliary swinging 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; and the shaft sleeve is fixedly sleeved with the rotating shaft.

7. A stair climbing chair having the rear wheel swing mechanism as claimed in any one of claims 1 to 6, characterized in that The chair frame is provided with a seat plate and a backrest; two groups of caterpillar track frames are fixedly installed on the rear part of the chair frame; caterpillar tracks are installed on the caterpillar track frames; a stair climbing motor for driving the two caterpillar tracks to synchronously rotate is further installed on the chair frame; two front wheels are installed on the front end of the chair frame; the front wheels are driven wheels; and the rear wheels are driving wheels.

8. The stair chair of claim 7, wherein, The front wheels are universal wheels or omni-directional wheels.

9. The stair chair of claim 7, wherein, A battery box is installed on the rear side of the backrest; armrests are arranged on the two sides of the chair frame; and control knobs are arranged on the armrests.

10. The stair chair of claim 7, wherein, The auxiliary swinging arms are fixedly connected to the wheel leg plates through connecting sleeves; and side plates are arranged below the two sides of the seat plate.

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