CN115177450A - Wheelchair speed limit protector - Google Patents

Abstract

The invention relates to a wheelchair speed-limiting protection device. The wheelchair speed-limiting protection device comprises a wheelchair base body, wherein the left side and the right side of the wheelchair base body are respectively and fixedly connected with a cross shaft, the two cross shafts are symmetrically arranged and are respectively and rotatably connected with wheel shafts, speed-limiting devices are respectively arranged on the two cross shafts, and triggering devices for triggering the speed-limiting devices on the corresponding sides of the two wheel shafts are respectively arranged on the two wheel shafts; the trigger device comprises straight rods which are respectively and fixedly connected with the upper side and the lower side of the outer edge surface of each wheel shaft and are symmetrical about the axis of the straight rods, each straight rod is connected with a cross rod in a rotating mode, the distance from one end of each cross rod far away from the base body to the rotating connection position of the base body and the straight rods is far greater than the distance from one end of each cross rod close to the base body to the rotating connection position of the cross rod and the straight rods, a heavy block is fixedly connected with one end of each cross rod far away from the base body, and a vertical rod is fixedly connected with one end of each cross rod close to the base body. The speed limiting device has an autonomous braking speed limiting function, so that the speed of the wheelchair can be controlled within a safety range, and the injury to passengers due to out-of-control speed of the wheelchair when the wheelchair passes through a steep slope is avoided.

Description

A wheelchair speed limit protection device

technical field

The invention relates to the technical field of wheelchairs, in particular to a wheelchair speed limit protection device.

Background technique

Wheelchairs have a great auxiliary role for some special groups of people with disabilities. Wheelchairs are not only a means of transportation for people with disabilities, but also their support for physical exercise and social activities. Wheelchairs provide great help to people with disabilities. , its use also has certain risks. For example, when using a wheelchair to pass a steep slope, if the person in the wheelchair loses control when passing through the steep slope due to human factors or force majeure factors such as the failure of the braking system, it will easily cause huge damage to the person in the wheelchair. Therefore, there is an urgent need for a wheelchair with an autonomous braking speed limit, so that the speed of the wheelchair can be controlled within a safe range, so as to prevent the wheelchair from going out of control when going over a steep slope and causing injury to the passengers.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a wheelchair speed-limiting protection device, which has an autonomous braking and speed-limiting function, so that the wheelchair speed can be controlled within a safe range, and the speed of the wheelchair can be prevented from running out of control when passing a steep slope. Injury to passengers.

The invention provides a wheelchair speed-limiting protection device, the technical scheme of which is:

A wheelchair speed-limiting protection device, comprising a wheelchair base body, the left and right sides of the base body are respectively fixedly connected with horizontal shafts, the two horizontal shafts are symmetrically arranged and are respectively rotatably connected with wheel shafts, the speed-limiting devices are respectively installed on the two horizontal shafts, and the two wheel shafts are respectively A triggering device for triggering its corresponding side speed limiting device is installed;

The triggering device includes a straight rod symmetrical about its axis is fixedly connected on the upper and lower sides of the outer edge of each axle, each straight rod is rotatably connected with a cross rod, and one end of each cross rod away from the base body is away from its rotational connection with the straight rod. The distance is far greater than the distance between the end of the crossbar near the base and the rotational connection between it and the straight rod. Each crossbar is fixedly connected with a weight at one end away from the base, and each crossbar is fixedly connected with one end of the base. Vertical rods are fixed on each axle. A plurality of support springs which are fixedly connected with the corresponding side rails are connected, and each wheel axle is fixedly connected with a plurality of support rods which are in contact with and cooperate with the corresponding side rails.

Preferably, the speed limiting device includes a baffle plate fixedly connected to the two horizontal shafts coaxially, and a plurality of guides located on the inner side of the baffle plate and arranged laterally are evenly distributed on the outer edge surfaces of the two lateral shafts. key, the two horizontal shafts are respectively sleeved with outer friction discs that are slidably matched with their corresponding side guide keys, the outer end faces of each outer friction disc are in contact and fit with the vertical rods on their corresponding sides respectively, and each outer friction plate is in contact with the corresponding side of the vertical rods. The baffle plates are fixedly connected by a plurality of adjusting springs in an annular array, and the two horizontal shafts are respectively coaxially fixedly connected to the inner friction discs which can be matched with the outer friction discs on the corresponding sides.

Preferably, the inner end surfaces of each of the outer friction discs are respectively coaxially and fixedly connected with outer friction plates, and the outer end surfaces of each of the inner friction discs are respectively coaxially and fixedly connected with inner friction plates that can contact and cooperate with the outer friction plates on the corresponding side. piece.

Preferably, rear wheels are fixedly connected to the two wheel axles coaxially, respectively, and two front wheels arranged symmetrically on the left and right are rotatably connected to the front side of the base body.

Preferably, a protective casing for protecting the corresponding side triggering device and the speed limiting device is fixedly connected to the two horizontal shafts coaxially.

The present invention provides a wheelchair speed-limiting protection device. Compared with the prior art, its beneficial effects are:

In the present invention, the triggering device provided can act by the walking speed of the rear wheel of the wheelchair to trigger the speed limiting device. When the walking speed of the rear wheel exceeds the set safe speed, the weight is affected by the centrifugal force and overcomes the tension of the support spring. The action occurs, and then the vertical rod pushes the outer friction disc to cooperate with the inner friction disc, so that the rotation speed of the axle and the rear wheel fixedly connected with the axle is reduced to within the safe speed, ensuring that the wheelchair speed is always within the safe speed, and the outer friction plate provided with The cooperation of the inner friction plates ensures that the friction force is sufficient to quickly reduce the speed of the wheelchair, and the provided protective shell can protect the components of the trigger device and the speed limit device.

Description of drawings

FIG. 1 is a partial cross-sectional view of the present invention.

FIG. 2 is an enlarged view of area A in the partial cross-sectional view of the present invention.

FIG. 3 is a partial perspective sectional view of the present invention.

FIG. 4 is an enlarged view of region B in the partial perspective cross-sectional view of the present invention.

Figure 5 is a front view of the present invention.

FIG. 6 is a perspective view of the utility model.

In the picture: 1. Base body, 2. Horizontal shaft, 3. Wheel shaft, 4. Straight rod, 5. Horizontal rod, 6. Weight, 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 ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:

The specific embodiment of the wheelchair speed limit protection device of the present invention, as shown in FIG. 1 to FIG. 6 , includes a base body 1 of a wheelchair. The left and right sides of the base body 1 are respectively fixedly connected with horizontal shafts 2, and the two horizontal shafts 2 are symmetrically arranged and rotated respectively. A wheel shaft 3 is connected, a speed limiting device is respectively installed on the two horizontal shafts 2, and a triggering device for triggering the corresponding side speed limiting device is respectively installed on the two wheel shafts 3.

In this embodiment, the triggering device includes straight rods 4 which are fixedly connected to the upper and lower sides of the outer edge of each wheel shaft 3 with respect to its axis. The distance from its rotational connection with the straight bar 4 is far greater than the distance from the end of the cross bar 5 close to the base 1 from its rotational connection with the straight bar 4, and each cross bar 5 is fixedly connected with a weight 6 at one end away from the base 1. One end of the rod 5 close to the base body 1 is fixedly connected with a vertical rod 7, each wheel axle 3 is fixedly connected with a plurality of supporting springs 8 that are fixedly connected with its corresponding side cross rod 5, and each wheel axle 3 is fixedly connected with a plurality of its corresponding side cross rods. The rod 5 contacts the mating support rod 9 .

In this embodiment, the speed-limiting device includes a baffle plate 10 fixedly connected to the two horizontal shafts 2 coaxially, and a plurality of guides located inside the baffle plate 10 and arranged laterally are evenly distributed on the outer edge surfaces of the two lateral shafts 2 . The keys 11 and the two horizontal shafts 2 are respectively sleeved with outer friction discs 12 which are slidably matched with the guide keys 11 on their corresponding sides. 15 and the baffle plate 10 on the corresponding side are fixedly connected by a plurality of adjusting springs 13 in an annular array, and the two horizontal shafts 2 are respectively coaxially fixedly connected to the inner friction plate 14 which can cooperate with the outer friction plate 12 on the corresponding side.

In this embodiment, the inner end surfaces of each outer friction disc 12 are respectively coaxially and fixedly connected with the outer friction plates 15, and the outer end surfaces of each inner friction disc 14 are respectively coaxially and fixedly connected with the outer friction plates 15 on the corresponding side that can be in contact and fit. Internal friction plate 16. Rear wheels 17 are coaxially and fixedly connected to the two axles 3 respectively, and two front wheels 18 that are symmetrically arranged on the front side of the base body 1 are rotatably connected. A protective shell 19 for protecting the corresponding side triggering device and the speed limiting device is fixedly connected to the two horizontal shafts 2 coaxially.

While wheelchairs provide great help to people with limited mobility, there are still certain risks and limitations in their use. The wheelchair is very likely to lose control due to excessive speed, causing injury to the person in the wheelchair. The present invention is designed to prevent this phenomenon from occurring.

When the wheelchair walks 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 restriction action of the straight bar 4 and the support spring 8 and the support action of the support bar 9, and the trigger device And the speed limiter will not move, the wheelchair will walk at normal speed. When the speed of the wheelchair exceeds the safe speed, the rotational 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 6 integrally connected with the axle 3 through the straight rod 4 and the cross bar 5 will overcome the support spring 8 The pulling force makes the weight 6 away from the axle 3, and the weight 6 away from the axle 3 will drive the cross bar 5 to rotate around its rotational connection with the straight bar 4, thereby making the vertical bar 7 push the outer friction disc 12. Since the distance from the end of the cross bar 5 away from the base body 1 from its rotational connection with the straight bar 4 is much greater than the distance from the end of the cross bar 5 close to the base body 1 from its rotational connection with the straight bar 4, and the weight 6 is far away from the base body when the cross bar 5 is far away from the base body 1 one end, according to the principle of force balance: the thrust of the vertical rod 7 to push the outer friction disc 12 will be much greater than the centrifugal force received by the weight 6, ensuring that the thrust can overcome the tension of the adjusting spring 13 between the baffle plate 10 and the outer friction disc 12, And push the outer friction disc 12 to move close to the inner friction disc 14 along the guide key 11 on the horizontal axis 2, so that the inner friction disc 14 contacts with the outer friction disc 12 to reduce 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 friction damping, so that the deceleration effect is efficient and obvious.

When the inner friction plate 16 is in contact with the outer friction plate 15, the rotational speed of the axle 3 decreases rapidly due to the frictional force. As the rotational speed of the axle 3 decreases rapidly, the centrifugal force received by the weight 6 and the vertical rod 7 push the outer friction plate 12. The thrust will also be reduced synchronously until the rotational speed of the axle 3 is reduced to a safe speed. At this time, the centrifugal force received by the weight 6 will be less than the pulling force of the support spring 8. At this time, the cross bar 5 is under the support of the spring tension and the support rod 9. The transverse state will be restored. Similarly, the outer friction disc 12 will also be restored to the separation state from the outer friction disc 12 under the tension of the adjusting spring 13. The protective shell 19 provided can protect the trigger device and the speed limiting device.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection of the present invention. within the range.

Claims (5)

1. A wheelchair speed limit protection device, comprising a base body (1) of a wheelchair, characterized in that the left and right sides of the base body (1) are respectively fixedly connected with transverse shafts (2), and the two transverse shafts (2) are symmetrically arranged and rotated respectively. A wheel shaft (3) is connected, a speed limiting device is respectively installed on the two horizontal shafts (2), and a triggering device for triggering the corresponding side speed limiting device is respectively installed on the two wheel shafts (3); The triggering device comprises a straight rod (4) symmetrical about its axis is fixedly connected on the upper and lower sides of the outer edge of each wheel shaft (3), each straight rod (4) is rotatably connected with a cross rod (5), and each cross rod (5) The distance from the end away from the base (1) from its rotational connection with the straight rod (4) is much greater than the distance from the end of the crossbar (5) close to the base (1) from its rotational connection with the straight rod (4). A weight (6) is fixedly connected to one end of the crossbar (5) away from the base body (1), and a vertical rod (7) is fixedly connected to one end of each crossbar (5) close to the base body (1). A plurality of support springs (8) fixedly connected to the corresponding side rails (5) are fixedly connected, and each wheel axle (3) is fixedly connected with a plurality of support rods (9) that are in contact with the corresponding side rails (5). 2. A wheelchair speed limiting protection device according to claim 1, characterized in that, the speed limiting device comprises a baffle plate (10) fixedly connected to the two transverse shafts (2) coaxially, and two A plurality of guide keys (11) located on the inner side of the baffle plate (10) and arranged laterally are respectively uniformly distributed on the outer edge surface of the horizontal shaft (2), and corresponding to the two horizontal shafts (2) are respectively sleeved on the two horizontal shafts (2). The outer friction discs (12) are slidably fitted with the side guide keys (11). The baffle plates (10) are fixedly connected by a plurality of adjusting springs (13) in an annular array, and the two transverse shafts (2) are respectively coaxially fixedly connected to the outer friction plates (12) on the corresponding sides thereof. Internal friction disc (14). 3 . The wheelchair speed limit protection device according to claim 2 , wherein the inner end surfaces of each of the outer friction discs ( 12 ) are respectively coaxially and fixedly connected with outer friction plates ( 15 ), and each of the inner friction discs ( 12 ). The outer end surfaces of the disk (14) are respectively coaxially and fixedly connected with inner friction plates (16) which can be contacted and matched with the outer friction plates (15) on the corresponding sides thereof. 4 . The wheelchair speed limit protection device according to claim 1 , wherein the two wheel axles ( 3 ) are respectively coaxially and fixedly connected with rear wheels ( 17 ), and the front side of the base body ( 1 ) is rotatably connected with a rear wheel ( 17 ). 5 . Two front wheels (18) are arranged symmetrically on the left and right. 5 . The wheelchair speed limit protection device according to claim 1 , wherein the two horizontal shafts ( 2 ) are both coaxially and fixedly connected with a protective shell for protecting the corresponding side trigger device and the speed limit device. 6 . (19).

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