Stair climbing chair with auxiliary support legs

Abstract

This invention relates to the field of wheelchair technology and provides a stair-climbing chair with auxiliary support legs. The chair includes a frame with two track frames on the back, each with a track. Two front wheels are mounted at the front of the frame. Two reciprocating rear wheel legs are mounted on each side of the frame, each with a rear wheel. A support leg is rotatably mounted on the outer side of each track frame, with a support wheel at its lower end. The two support legs have a supporting posture and a retracted posture, and can synchronously rotate to switch between these postures. In the supporting posture, the two support legs are extended to their maximum angle towards the back of the frame. Thus, by providing two extendable support legs on the back of the frame, this invention allows the stair-climbing chair to lean back when crossing a threshold or a single step, with the support legs touching the ground to assist in supporting the chair and preventing it from tipping over. The support legs also work in conjunction with the track to help the chair cross thresholds. Users can operate the stair-climbing chair independently, expanding its usage scenarios.

Description

Technical Field

[0001] This invention belongs to the field of wheelchair technology, and in particular relates to a stair-climbing chair with auxiliary support legs. Background Technology

[0002] For example, the stair-climbing chair disclosed in Chinese patent CN223731640U can climb stairs independently and can also be used outdoors to climb steps.

[0003] The ability to traverse thresholds or single, high steps is essential for stair-climbing chairs. Currently, existing stair-climbing chairs can directly overcome high thresholds or steps by increasing the torque of the drive wheels. However, this requires significant structural modifications, such as increasing the diameter of the drive wheels or omnidirectional wheels, increasing the overall dimensions, and increasing the weight of the chair. Furthermore, the height of steps that existing stair-climbing chairs can overcome is limited, typically not exceeding 15cm, affecting portability and accessibility to stair platforms.

[0004] When using the tracks to cross a threshold, the stair-climbing chair needs to switch to a climbing posture. However, since both sides of the threshold are flat and lack height difference, the center of gravity of the wheelchair is already behind the threshold before the tracks of the stair-climbing chair cross it. This causes the stair-climbing chair to tilt backward with the threshold as a fulcrum, which can lead to danger for the user.

[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0006] To address the aforementioned shortcomings, this invention provides a stair-climbing chair with auxiliary support legs, solving the technical problem that existing stair-climbing chairs cannot pass thresholds independently.

[0007] To address the aforementioned problems, this invention provides a stair-climbing chair with auxiliary support legs. The core idea is to add an additional support point beyond the two sets of support points (tracks and rear wheels) to facilitate crossing thresholds and single high thresholds. The chair includes a chair frame with two track frames on its back, each track frame having tracks. Two front wheels are mounted on the front end of the chair frame. A reciprocating rear wheel leg is mounted on each side of the chair frame, with a rear wheel mounted on each rear wheel leg. A support leg is rotatably mounted on the outer side of each track frame, with a support wheel at its lower end. The two supporting legs have a supporting posture and a retracted posture, and the two supporting legs can rotate synchronously to switch between the supporting posture and the retracted posture. The supporting posture is such that the two supporting legs are spread out to their maximum angle towards the back of the chair frame.

[0008] According to the stair-climbing chair with auxiliary support legs of the present invention, a stop block is fixed on the support leg, and a limiting block for abutting and cooperating with the stop block is fixed on the outer side of the track frame.

[0009] According to the stair-climbing chair with auxiliary support legs of the present invention, the limiting block and the track frame are detachably connected; the track frame is provided with multiple installation positions for the limiting block.

[0010] According to the stair-climbing chair with auxiliary support legs of the present invention, a linkage shaft is rotatably connected between the two track frames, and the two ends of the linkage shaft are respectively fixedly sleeved with the support legs on the corresponding side; a swing leg motor for driving the linkage shaft to rotate is also installed on the track frame.

[0011] According to the stair-climbing chair with auxiliary support legs of the present invention, the leg-swinging motor is driven and connected to a gearbox; the gearbox is provided with a drive gear that is connected to the leg-swinging motor through gear transmission, and the linkage shaft is fixedly sleeved on the drive gear.

[0012] According to the present invention, the stair-climbing chair with auxiliary support legs is wherein the linkage shaft is connected to the support legs via a key drive.

[0013] According to the stair-climbing chair with auxiliary support legs of the present invention, the support legs include a first support section fixedly sleeved with the linkage shaft and a second support section on which the support wheel is installed; the first support section and the second support section are provided with a plurality of bolt holes at equal intervals; the bolt holes facing each other on the first support section and the second support section are fixed by through bolts.

[0014] According to the stair-climbing chair with auxiliary support legs of the present invention, the support legs include a first support section fixedly sleeved with the linkage shaft and a second support section on which the support wheel is installed; the first support section and the second support section are respectively provided with a row of teeth that can mesh; the first support section is provided with an elongated hole, and the second support section is provided with a plurality of bolt holes at equal intervals; the bolt holes and the elongated holes can be fixed by bolts.

[0015] According to the present invention, a stair-climbing chair with auxiliary support legs has a distance detection sensor fixed on the support legs.

[0016] According to the stair-climbing chair with auxiliary support legs of the present invention, the distance detection sensor is an infrared proximity photoelectric switch.

[0017] In summary, this invention features two extendable support legs on the back of the chair frame. When the stair-climbing chair tilts backward, the support legs can touch the ground to assist in supporting the chair and prevent it from tipping over. They can also work with the tracks to help the chair cross thresholds. Users can operate the stair-climbing chair independently, expanding its usage scenarios. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Internal structure diagram; Figure 3 This is a schematic diagram of the structure of one embodiment of the support leg of the present invention; Figure 4 This is a schematic diagram of the structure of one embodiment of the support leg of the present invention; Figure 5 This is a schematic diagram of the structure of one embodiment of the support leg of the present invention; Figure 6 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention is moving through steps; Figure 7 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention is moving through steps; Figure 8 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention is moving through steps; Figure 9 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention is moving through steps; Figure 10 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention is moving through steps; Figure 11 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention passes through a threshold; Figure 12 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention passes through a threshold; Figure 13 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention passes through a threshold; Figure 14 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention passes through a threshold; Figure 15 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention passes through a threshold; Figure 16 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention passes through a threshold; Figure 17 This is a schematic diagram of a scenario where the stair-climbing chair of the present invention passes through a threshold; In the diagram: 1-Chair frame, 11-Strap; 2-Front wheel, 3-Rear wheel, 31-Rear wheel leg; 4-Track frame, 41-Track; 5-Support leg, 51-Swing leg motor, 52-Gearbox, 53-Linkage shaft, 54-Stop block, 55-Support wheel, 56-Shaft hole, 561-Keyway; 57-First support section, 571-Elongated hole; 58-Second support section, 59-Bolt, 591-Tooth; 6-Limit block, 100-Flat ground, 101-Step, 102-Sill. Detailed Implementation

[0019] See Figure 1 and Figure 2The present invention provides a stair-climbing chair with auxiliary support legs, including a chair frame 1, two track frames 4 on the back side of the chair frame 1, and track 41 on the track frames 4; two front wheels 2 are installed at the front end of the chair frame 1; and a rear wheel leg 31 capable of reciprocating swing is installed on each side of the chair frame 1, and a rear wheel 3 is installed on each rear wheel leg 31. The stair-climbing chair of the present invention can switch its working posture by swinging the rear wheel leg 31, enabling it to perform flat-ground walking and stair-climbing actions. Those skilled in the art can use known technologies and structures to achieve the switching of working postures, such as the front-wheel drive stair-climbing chair solution disclosed in Chinese Patent CN223731640U.

[0020] Combination Figure 3 Each track frame 4 has a support leg 5 rotatably mounted on its outer side, and the lower end of each support leg 5 is provided with a support wheel 55; the two support legs 5 can rotate synchronously to switch between a supporting posture and a retracted posture; specifically: Combination Figure 6 and Figure 7 In the supporting posture, the two supporting legs 5 are spread out towards the back of the chair frame 1; when the chair frame 1 tilts backward to a certain extent, the supporting wheels 55 of the two supporting legs 5 can contact the ground and play a supporting role.

[0021] See Figure 2 The support leg 5 retracts and stops on the outside of the track frame 4; As one embodiment, a stop block 54 is fixed on the support leg 5, and a limiting block 6 is fixed on the outer side of the track frame 4 for abutting and cooperating with the stop block 54; when the support leg 5 is in a supporting posture, the limiting block 6 abuts against the stop block 54, limiting the maximum opening angle of the support leg 5.

[0022] After the support leg 5 opens, the stop block 54 abuts against the bottom of the limiting block 6, bearing the pressure of the support wheel 55 on the support leg 5, thereby reducing the pressure on the linkage shaft 53. This invention, by setting the stop block 54 on the support leg 5 to cooperate with the limiting block 6, bears the support load, reduces the load on the linkage shaft 53, can reduce the diameter of the linkage shaft 53, and thus reduce the size of the gearbox that cooperates with the linkage shaft 53, optimizing the overall structure while also reducing the risk of damage to the linkage shaft 53.

[0023] Optionally, the limiting block 6 is detachably connected to the track frame 4 and has multiple mounting positions on the track frame 4. By changing the mounting position of the limiting block 6 on the track frame 4, the maximum opening angle of the support leg 5 is changed, so that when the two support legs 5 are in a supporting posture, they can stably support the backward-leaning stair-climbing chair, while keeping the stair-climbing chair at an appropriate backward-leaning angle.

[0024] See Figure 2As one embodiment, a linkage shaft 53 is rotatably connected between the two track frames 4, and the two ends of the linkage shaft 53 are respectively fixedly sleeved on the corresponding side of the support leg 5; the track frame 4 is also equipped with a swing leg motor 51 for driving the linkage shaft 53 to rotate. Furthermore, the leg-swinging motor 51 is connected to a gearbox; the gearbox contains a drive gear that is connected to the leg-swinging motor 51 via gear transmission, and the linkage shaft 53 is fixedly sleeved on the drive gear. More preferably, the drive gear and the linkage shaft 53 are connected via a key transmission.

[0025] Furthermore, the linkage shaft 53 is connected to the support leg 5 via a key drive sleeve.

[0026] Optionally, the support leg 5 is provided with a shaft hole 56 for connecting the linkage shaft 53, and the edge of the shaft hole 56 is provided with a keyway 561 for placing a key. See Figure 4 In one embodiment, the support leg 5 includes a first support section 57 that is fixedly sleeved on the linkage shaft 53 and a second support section 58 on which the support wheel 55 is installed; the first support section 57 and the second support section 58 are provided with a plurality of bolt holes at equal intervals; the bolt holes facing each other on the first support section 57 and the second support section 58 can be fixed by through bolts 59; By adjusting the bolt holes that face the first support section 57 and the second support section 58, the length of the support leg 5 can be adjusted to adapt to different models of stair climbing chairs or different usage scenarios.

[0027] As one embodiment, the first support section 57 and the second support section 58 are respectively provided with a row of teeth that can mesh together; the first support section 57 is provided with an elongated hole 571, and the second support section 58 is provided with a plurality of bolt holes at equal intervals; the bolt holes and the elongated hole 571 can be fixed together by a through bolt 59; After bolt 59 is tightened, a large static friction force is generated between the interlocking teeth of the first support section 57 and the second support section 58, improving the tightness of their fit. Bolt 59 has a certain adjustment range within the elongated hole 571, and the distance of at least one tooth can be adjusted each time, improving the accuracy of the length adjustment of the support leg 5.

[0028] As one embodiment, a distance detection sensor is fixed on the support leg 5; when the support leg 5 is in the open state and tilts backward with the stair-climbing chair, it can detect the distance to the ground. Based on the detected distance value, it can determine whether the support wheel 55 of the support leg 5 is in contact with the ground.

[0029] Optionally, a threshold range can be set based on the distance between the distance detection sensor and the support wheel 55. When the stair-climbing chair tilts backward, if the distance value fed back by the distance detection sensor enters the threshold range, it can be determined that the support wheel 55 is in contact with the ground, and then the stair-climbing chair can proceed to the next action.

[0030] Preferably, the distance detection sensor is an infrared proximity photoelectric switch.

[0031] As one application scenario of the stair-climbing chair of the present invention, the process of climbing over a large span of steps 101 is as follows: See Figure 6 When the rear wheel 3 contacts the vertical surface of step 101, the two supporting legs 5 switch to the supporting posture. See Figure 7 Then the rear wheel leg 31 swings up, and the stair-climbing chair tilts backward until the support wheel 55 contacts the higher flat ground 100; See Figure 8 The rear wheel leg 31 continues to swing until the rear wheel 3 and the front wheel 2 are completely lifted off the ground, and the track 41 and the support leg 5 together support the stair climbing chair. See Figure 9 Track 41 drives the stair-climbing chair to complete the climb and allows the stair-climbing chair to continue moving on the flat ground 100, leaving a safe distance; See Figure 10 The stair-climbing chair returns to its original position, and the two supporting legs switch to the folded-up position.

[0032] As one application scenario of the stair-climbing chair of the present invention, the process of crossing threshold 102 is as follows: See Figure 11 When the rear wheel 3 contacts one side of the sill 102, the two support legs 5 switch to the support posture. See Figure 12 Then the rear wheel leg 31 swings up, and the stair-climbing chair tilts backward until the support wheel 55 touches the flat ground 100 on the other side of the threshold 102. See Figure 13 The rear wheel leg 31 continues to swing until the rear wheel 3 and the front wheel 2 are completely lifted off the ground, and the track 41 and the support leg 5 together support the stair climbing chair. See Figure 14 The track 41 drives the stair-climbing chair to move until it touches the threshold 102; See Figure 15 Track 41 continues to drive the stair-climbing chair, crossing threshold 102; See Figure 16 After completing the crossing, the track 41 continues to drive the stair-climbing chair to move on the flat ground 100; after moving away from the threshold 102, the stair-climbing chair returns to its original posture, and the two supporting legs 5 switch to the retracted posture.

[0033] In this application scenario, threshold 102 can be the threshold of a resident's security door, the threshold of a community gate, or the threshold of a Buddhist hall or Taoist temple in a scenic area.

[0034] See Figure 12 When the support wheel 55 and the rear wheel 3 of the present invention are in contact with the ground at the same time, the distance between them is not less than 10cm; it can cross the threshold 102 of a household and meet the daily use needs of users.

[0035] Preferably, this distance is 10-15cm, which is suitable for most outdoor scenarios and meets the user's travel needs.

[0036] Optionally, the present invention can adjust the distance by adjusting the length of the support leg 5 or the maximum angle of its opening, making it convenient to use.

[0037] In summary, this invention provides a stair-climbing chair with auxiliary support legs, which features two extendable support legs on the back of the chair frame. When the chair tilts backward, the support legs can touch the ground to assist in supporting the chair and prevent it from tipping over. Furthermore, the support legs can work in conjunction with the tracks to cross thresholds or individual steps. Users can operate the chair independently, expanding its usage scenarios.

[0038] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A stair-climbing chair with auxiliary support legs, comprising a chair frame, two track frames provided on the back of the chair frame, the track frames being provided with tracks; two front wheels installed at the front end of the chair frame; and a reciprocatingly swinging rear wheel leg installed on each side of the chair frame, each rear wheel leg being provided with a rear wheel; characterized in that, Each of the track frames is rotatably provided with a support leg on its outer side, and the lower end of the support leg is provided with a support wheel; The two supporting legs have a supporting posture and a retracted posture, and the two supporting legs can rotate synchronously to switch between the supporting posture and the retracted posture. The supporting posture is such that the two supporting legs are spread out to their maximum angle towards the back of the chair frame.

2. The stair-climbing chair with auxiliary support legs as described in claim 1, characterized in that, A stop block is fixed on the support leg, and a limiting block for abutting and cooperating with the stop block is fixed on the outer side of the track frame.

3. The stair-climbing chair with auxiliary support legs as described in claim 2, characterized in that, The limiting block and the track frame are detachably connected; the track frame has multiple installation positions for the limiting block.

4. The stair-climbing chair with auxiliary support legs as described in claim 1, characterized in that, A linkage shaft is rotatably connected between the two track frames, and the two ends of the linkage shaft are respectively fixedly sleeved with the corresponding support legs on one side; a swing leg motor for driving the linkage shaft to rotate is also installed on the track frame.

5. The stair-climbing chair with auxiliary support legs as described in claim 4, characterized in that, The leg swing motor is connected to a gearbox; the gearbox contains a drive gear that is connected to the leg swing motor via gear transmission, and the linkage shaft is fixedly sleeved on the drive gear.

6. The stair-climbing chair with auxiliary support legs as described in claim 4, characterized in that, The linkage shaft and the support leg are connected by a key drive.

7. The stair-climbing chair with auxiliary support legs as described in claim 1, characterized in that, The support leg includes a first support section that is fixedly sleeved on the linkage shaft and a second support section on which the support wheel is installed; the first support section and the second support section are provided with a plurality of bolt holes at equal intervals; the bolt holes facing each other on the first support section and the second support section are fixed by through bolts.

8. The stair-climbing chair with auxiliary support legs as described in claim 1, characterized in that, The support leg includes a first support section fixedly sleeved on the linkage shaft and a second support section on which the support wheel is installed; the first support section and the second support section are respectively provided with a row of teeth that can mesh; the first support section is provided with an elongated hole, and the second support section is provided with multiple bolt holes at equal intervals; the bolt holes and the elongated holes can be fixed by bolts.

9. The stair-climbing chair with auxiliary support legs as described in any one of claims 1 to 8, characterized in that, A distance detection sensor is fixed on the support leg.

10. The stair-climbing chair with auxiliary support legs as described in claim 9, characterized in that, The distance detection sensor is an infrared proximity photoelectric switch.

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