Wheelchair speed limiting protection device

Abstract

The present invention relates to a wheelchair speed limiting protection device. The wheelchair speed limiting protection device comprises a wheelchair base, wherein the left and right sides of the base are respectively fixedly connected with horizontal axes, the two horizontal axes are symmetrically arranged and respectively rotatably connected with wheel axles, the two horizontal axes are respectively installed with speed limiting devices, and the two wheel axles are respectively installed with triggering devices for triggering the speed limiting devices on the corresponding sides; the triggering device comprises straight rods symmetrical about the axis line fixedly connected to the upper and lower sides of the outer edge surface of each wheel axle, each straight rod is rotatably connected with a horizontal rod, the distance between the end of each horizontal rod away from the base and the rotation connection between it and the straight rod is much greater than the distance between the end of the horizontal rod close to the base and the rotation connection between it and the straight rod, each horizontal rod is fixedly connected with a weight block at the end away from the base, and each horizontal rod is fixedly connected with a vertical rod at the end close to the base. The invention has an autonomous braking speed limiting function, so that the speed of the wheelchair can be controlled within a safe range, and the speed of the wheelchair is prevented from being out of control when passing a steep slope, thereby preventing the wheelchair from causing harm to the passengers.

Description

Technical Field

[0001] The invention relates to the technical field of wheelchairs, in particular to a speed limiting protective device for wheelchairs. Background Art

[0002] Wheelchairs play a great auxiliary role for some special groups of people with limited mobility. Wheelchairs are not only a means of transportation for people with limited mobility, but also a means of support for them to exercise and participate in social activities. While wheelchairs provide great help to people with limited mobility, their use also involves certain risks. For example, when using a wheelchair to pass through a steep slope, if the person in the wheelchair loses control of the wheelchair due to human factors or force majeure factors such as failure of the brake system, this can easily cause great harm to the person in the wheelchair. Therefore, there is an urgent need for a wheelchair with autonomous braking and speed limiting, so that the speed of the wheelchair can be controlled within a safe range, to avoid the speed of the wheelchair losing control when passing through a steep slope, causing harm to the passengers. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a wheelchair speed limit protection device, which has an autonomous braking speed limit function, so that the speed of the wheelchair can be controlled within a safe range, avoiding the speed of the wheelchair getting out of control when passing a steep slope and causing harm to the passengers.

[0004] The present invention provides a wheelchair speed limiting protection device, and its technical solution is:

[0005] A wheelchair speed limiting protection device comprises a wheelchair base, wherein the left and right sides of the base are respectively fixedly connected with transverse axes, the two transverse axes are symmetrically arranged and respectively rotatably connected with wheel axles, the two transverse axes are respectively installed with speed limiting devices, and the two wheel axles are respectively installed with triggering devices for triggering the speed limiting devices on the corresponding sides;

[0006] The trigger device includes straight rods symmetrical about the axis line fixedly connected to the upper and lower sides of the outer edge surface of each wheel axle, each straight rod is rotatably connected to a cross rod, the distance between the end of each cross rod away from the base and the rotation connection between it and the straight rod is much greater than the distance between the end of the cross rod close to the base and the rotation connection between it and the straight rod, each cross rod is fixedly connected to a weight block at the end away from the base, and each cross rod is fixedly connected to a vertical rod at the end close to the base, each wheel axle is fixedly connected to a plurality of support springs fixedly connected to the corresponding side cross rods, and each wheel axle is fixedly connected to a plurality of support rods contacting and cooperating with the corresponding side cross rods.

[0007] Preferably, the speed limiting device includes two transverse axes with baffles coaxially fixedly connected thereto, a plurality of guide keys located on the inner side of the baffles and arranged laterally are evenly distributed on the outer edge surfaces of the two transverse axes, outer friction plates slidingly matched with the guide keys on the corresponding sides are respectively sleeved on the two transverse axes, the outer end surfaces of each outer friction plate are respectively in contact with the vertical rods on the corresponding sides, each outer friction plate is fixedly connected to the baffle on the corresponding side via a plurality of adjusting springs in a ring array, and inner friction plates that can match the outer friction plates on the corresponding sides are respectively coaxially fixedly connected to the two transverse axes.

[0008] Preferably, the inner end surface of each outer friction disk is coaxially fixedly connected with an outer friction plate, and the outer end surface of each inner friction disk is coaxially fixedly connected with an inner friction plate capable of contacting and cooperating with the outer friction plate on the corresponding side.

[0009] Preferably, the two wheel axles are coaxially and fixedly connected with rear wheels, and the front side of the base is rotatably connected with two front wheels that are symmetrically arranged on the left and right.

[0010] Preferably, the two transverse axes are coaxially fixedly connected with protective shells for protecting the trigger devices and speed limiters on the corresponding sides.

[0011] The present invention provides a wheelchair speed limiting protection device, which has the following beneficial effects compared with the prior art:

[0012] In the present invention, the trigger device can be activated by the walking speed of the rear wheels of the wheelchair to trigger the speed limiting device. When the walking speed of the rear wheels exceeds the set safety speed, the weight is acted upon by the centrifugal force to overcome the pulling force of the supporting spring, thereby causing the vertical rod to push the outer friction plate to cooperate with the inner friction plate, so that the rotation speed of the axle and the rear wheel fixedly connected to the axle is reduced to within the safety speed, thereby ensuring that the speed of the wheelchair is always within the safety speed. The outer friction plate and the inner friction plate cooperate to ensure that the friction force is sufficient, thereby reducing the speed of the wheelchair quickly. The protective shell can protect the components of the trigger device and the speed limiting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a partial cross-sectional view of the present invention.

[0014] Figure 2 It is an enlarged view of area A in the local cross-sectional view of the present invention.

[0015] Figure 3 It is a three-dimensional cross-sectional view of a part of the present invention.

[0016] Figure 4 It is an enlarged view of the B area in the local stereoscopic cross-sectional view of the present invention.

[0017] Figure 5 It is the front view of the present invention.

[0018] Figure 6 This is a practical three-dimensional view.

[0019] In the figure: 1. base, 2. transverse axis, 3. wheel axle, 4. straight rod, 5. transverse rod, 6. weight block, 7. vertical rod, 8. support spring, 9. support rod, 10. baffle plate, 11. guide key, 12. outer friction plate, 13. adjustment spring, 14. inner friction plate, 15. outer friction plate, 16. inner friction plate, 17. rear wheel, 18. front wheel, 19. protective shell. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0021] A specific embodiment of the wheelchair speed limiting protection device of the present invention is as follows: Figures 1 to 6 As shown, the wheelchair comprises a base 1, wherein the base 1 has transverse axes 2 fixedly connected to the left and right sides thereof respectively, the two transverse axes 2 are symmetrically arranged and are rotatably connected to wheel axles 3 respectively, the two transverse axes 2 are respectively installed with speed limiting devices, and the two wheel axles 3 are respectively installed with triggering devices for triggering the speed limiting devices on the corresponding sides thereof.

[0022] In this embodiment, the trigger device includes straight rods 4 symmetrical about the axis line fixedly connected to the upper and lower sides of the outer edge surface of each wheel axle 3, each straight rod 4 is rotatably connected to a cross rod 5, the distance between the end of each cross rod 5 away from the base 1 and the rotational connection between it and the straight rod 4 is much greater than the distance between the end of the cross rod 5 close to the base 1 and the rotational connection between it and the straight rod 4, each cross rod 5 is fixedly connected to a weight block 6 at the end away from the base 1, and each cross rod 5 is fixedly connected to a vertical rod 7 at the end close to the base 1, each wheel axle 3 is fixedly connected to a plurality of support springs 8 fixedly connected to the corresponding side cross rods 5, and each wheel axle 3 is fixedly connected to a plurality of support rods 9 that contact and cooperate with the corresponding side cross rods 5.

[0023] In this embodiment, the speed limiting device includes two transverse axes 2, both of which are coaxially fixedly connected to a baffle plate 10, and the outer edge surfaces of the two transverse axes 2 are evenly distributed with a plurality of guide keys 11 located on the inner side of the baffle plate 10 and arranged laterally. The two transverse axes 2 are respectively sleeved with outer friction plates 12 that slide and cooperate with the guide keys 11 on the corresponding side, and the outer end surfaces of each outer friction plate 12 are respectively in contact with the vertical rod 7 on the corresponding side. Each outer friction plate 15 is fixedly connected to the baffle plate 10 on the corresponding side via a plurality of adjusting springs 13 in a ring array, and the two transverse axes 2 are respectively coaxially fixedly connected with inner friction plates 14 that can cooperate with the outer friction plates 12 on the corresponding side.

[0024] In this embodiment, the inner end surface of each outer friction disc 12 is coaxially fixedly connected with an outer friction plate 15, and the outer end surface of each inner friction disc 14 is coaxially fixedly connected with an inner friction plate 16 that can contact and cooperate with the outer friction plate 15 on the corresponding side. The two wheel axles 3 are coaxially fixedly connected with rear wheels 17, and the front side of the base 1 is rotatably connected with two front wheels 18 arranged symmetrically on the left and right. The two transverse axes 2 are coaxially fixedly connected with a protective shell 19 for protecting the trigger device and the speed limiter on the corresponding side.

[0025] While wheelchairs provide great help to people with limited mobility, there are still certain risks and limitations in their use. For example, when passing a steep slope, the wheelchair may lose control due to excessive speed due to the personal strength of the person in the wheelchair or the failure of the brake system due to force majeure, causing harm to the person in the wheelchair. The present invention is designed to prevent this phenomenon.

[0026] When the wheelchair moves at a normal speed under the cooperation of the front wheel 18 and the rear wheel 17, the cross bar 5 is maintained in a stable state under the limiting effect of the straight bar 4 and the support spring 8 and the supporting effect of the support bar 9, the trigger device and the speed limiter will not be activated, and the wheelchair will move at a normal speed. When the wheelchair speed exceeds the safe speed, the rotation speed of the axle 3 fixedly connected to the rear wheel 17 will also exceed the safe speed. At this time, the centrifugal force of the weight block 6 integrally connected to the axle 3 through the straight bar 4 and the cross bar 5 will overcome the pulling force of the support spring 8 and make the weight block 6 move away from the axle 3. The weight block 6 moving away from the axle 3 will drive the cross bar 5 to rotate around its rotation connection with the straight bar 4, thereby causing the vertical bar 7 to push the outer friction disc 12. Since the distance between the end of the cross bar 5 away from the base 1 and the rotation connection between it and the straight rod 4 is much greater than the distance between the end of the cross bar 5 close to the base 1 and the rotation connection between it and the straight rod 4, and the weight block 6 is at the end of the cross bar 5 away from the base 1, according to the force balance principle: the thrust of the vertical rod 7 pushing the outer friction disc 12 will be much greater than the centrifugal force exerted on the weight block 6, ensuring that the thrust can overcome the tension of the adjustment spring 13 between the baffle plate 10 and the outer friction disc 12, and push the outer friction disc 12 to move along the guide key 11 on the horizontal axis 2 close to the inner friction disc 14, so that the inner friction disc 14 contacts the outer friction disc 12 and thus reduces the walking speed of the wheelchair. In order to increase the friction effect between the outer friction disc 12 and the inner friction disc 14, the outer friction plate 15 and the inner friction plate 16 are provided to increase the friction damping, so that the deceleration effect is efficient and obvious.

[0027] When the inner friction plate 16 and the outer friction plate 15 are in contact and rubbed, the rotation speed of the wheel axle 3 is rapidly reduced due to the friction force. As the rotation speed of the wheel axle 3 is rapidly reduced, the centrifugal force on the weight 6 and the thrust of the vertical rod 7 pushing the outer friction disc 12 will also be reduced synchronously until the rotation speed of the wheel axle 3 is reduced to a safe speed. At this time, the centrifugal force on the weight 6 will be less than the tension of the support spring 8. At this time, the cross bar 5 will restore the horizontal rotation state under the support of the spring tension and the support rod 9. Similarly, the outer friction disc 12 will also restore the separation state from the outer friction disc 12 due to the tension of the adjustment spring 13. The protective shell 19 can protect the components of the trigger device and the speed limiter.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wheelchair speed limiting protection device, comprising a wheelchair base, characterized in that: The left and right sides of the base are respectively fixedly connected with transverse axes, the two transverse axes are symmetrically arranged and are rotatably connected with wheel axles, the two transverse axes are respectively installed with speed limiting devices, and the two wheel axles are respectively installed with triggering devices for triggering the speed limiting devices on the corresponding sides; The trigger device comprises straight rods symmetrical about the axis fixedly connected to the upper and lower sides of the outer edge surface of each wheel axle, each straight rod is rotatably connected to a cross rod, the distance between the end of each cross rod away from the base and the rotation connection between it and the straight rod is much greater than the distance between the end of the cross rod close to the base and the rotation connection between it and the straight rod, each cross rod is fixedly connected to a weight block at the end away from the base, each cross rod is fixedly connected to a vertical rod at the end close to the base, each wheel axle is fixedly connected to a plurality of support springs fixedly connected to the corresponding side cross rods, and each wheel axle is fixedly connected to a plurality of support rods contacting and cooperating with the corresponding side cross rods; The speed limiting device comprises two baffles coaxially fixedly connected to the two transverse axes, a plurality of guide keys located on the inner side of the baffles and arranged transversely are evenly distributed on the outer edge surfaces of the two transverse axes, an outer friction disk slidably matched with the guide keys on the corresponding side is sleeved on the two transverse axes, the outer end surface of each outer friction disk is respectively in contact with the vertical rod on the corresponding side, each outer friction plate is fixedly connected to the baffle on the corresponding side via a plurality of adjusting springs in an annular array, and an inner friction disk capable of matching with the outer friction disk on the corresponding side is coaxially fixedly connected to the two transverse axes; The inner end surface of each outer friction disc is coaxially fixedly connected with an outer friction plate, and the outer end surface of each inner friction disc is coaxially fixedly connected with an inner friction plate capable of contacting and cooperating with the outer friction plate on the corresponding side.

2. A wheelchair speed limiting protection device according to claim 1, characterized in that: The two wheel axles are respectively coaxially and fixedly connected with rear wheels, and the front side of the base is rotatably connected with two front wheels which are arranged symmetrically on the left and right.

3. A wheelchair speed limiting protection device according to claim 1, characterized in that: The two transverse axes are coaxially fixedly connected with protective shells for protecting the trigger devices and speed limit devices on the corresponding sides.

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