Front and rear four-claw equal-force wheelchair tightening and fixing device
By designing a front and rear four-claw isometric wheelchair tightening fixing device, and using the wire rope guide mechanism and the four-link mechanism to achieve equal force stress at the four fixing points of the wheelchair, the problems of unsafe and complex operation of wheelchair fixing in the prior art are solved, and riding comfort and safety are improved.
Patent Information
- Application Number
- CN202411733363.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-02-28
AI Technical Summary
The existing welfare wheelchair cannot be fixed during the process of getting on and off the vehicle, the operation is complicated and unsafe, and the existing fixture cannot achieve equal force stress at four fixed positions, resulting in poor riding comfort.
A front and rear four-claw isoforce wheelchair tightening fixing device is designed, and two symmetrically arranged wheelchair fixed wire ropes are used to realize the movement of the pulley assembly through the wire rope guide mechanism and the four-link mechanism. The double-head left and right rotating screws are used to drive the nut to rotate, adjust the position of the slider and pulley assembly, and ensure that the four fixed points of the wheelchair are subjected to equal force.
The four fixed points of the wheelchair are used to achieve the force under pressure, simplify the fixing operation, improve ride comfort and safety, and fixing can be implemented without the need for on-board operation.
Smart Images
Figure CN119527180A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of automation technology, and in particular relates to a front and rear four-claw equal-force wheelchair tightening and fixing device. Background Art
[0002] At present, the wheelchairs of welfare vehicles are not fixed during the process of getting on and off the vehicle, but are allowed to get on and off the vehicle in a state of free movement. Even in the welfare vehicle, personnel are required to operate the wheelchair fasteners at the rear and front of the vehicle respectively to fasten the wheelchair, and then put on the three-point safety belt for the passengers. During this process, it is not safe to get the wheelchair on and off the vehicle, and the operation process is very complicated and inconvenient; even if the wheelchair is fixed by a wheelchair fastener, the force at the four fixed positions cannot be consistent, resulting in extremely poor riding comfort for people with limited mobility during the driving of the welfare vehicle. Summary of the invention
[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a front and rear four-claw equal-force wheelchair tightening and fixing device.
[0004] In order to solve the above technical problems, the present invention provides a front and rear four-claw equal-force wheelchair tightening and fixing device, comprising two symmetrically arranged wheelchair fixing steel ropes, each wheelchair fixing steel rope having two ends respectively provided with hooks for fixing the wheelchair, the middle part of each wheelchair fixing steel rope is connected to a steel rope guiding mechanism, the steel rope guiding mechanism cooperates with the wheelchair fixing steel rope to form a pulley assembly, the pulley assembly is connected to a four-bar linkage, the four-bar linkage is cooperated with a double-headed left and right rotating screw, the two ends of the double-headed left and right rotating screw have threaded sections with opposite rotation directions, each threaded section is arranged with a movable nut, and the nut is hinged to one end of the four-bar linkage.
[0005] The present invention uses two steel wires with hooks to fix the wheelchair from both sides, and the steel wires and the guide mechanism form a pulley assembly. On the same pulley assembly, according to the principle of force balance, the forces exerted on the two hooks on the same wheelchair fixing wire are equal, and each wheelchair fixing wire acts on the fixing position of the front and rear wheelchair shafts on one side of the wheelchair through the hook at the same time, ensuring that the front and rear forces on the same side of the wheelchair are the same.
[0006] The optimized technical solution of the present invention is as follows: Furthermore, the wire rope guiding mechanism includes a connecting plate, a slider, a pressure plate and a U-shaped guide wheel. The slider is installed on a guide rail extending forward and backward and can move forward and backward along the guide rail. The connecting plate is installed on the slider, and the U-shaped guide wheel is installed on the connecting plate. The wheelchair fixing wire rope passes through the U-shaped guide wheel, and the pressure plate is arranged on the U-shaped guide wheel.
[0007] With the above structure, the rotation of the double-headed left and right spiral screws can drive the two nuts to rotate left and right, and then drive the four-bar linkage to close in the middle or open to both sides. During the movement of the four-bar linkage, the four-bar linkage can drive the slider to move forward and backward along the guide rail, and then adjust the wire rope.
[0008] Furthermore, the front and rear diagonal joint points of the four-bar linkage are fixedly mounted on the connecting plate of the slider by means of drilled hole screws.
[0009] Furthermore, washers are provided at the connection points between the reaming hole screw and the front and rear diagonal joints of the four-bar linkage.
[0010] Furthermore, the four-bar linkage is composed of four connecting rods connected end to end, and the four-bar linkage has four joint points, namely front, rear, left and right, wherein the left and right diagonal joint points are respectively provided with nuts, and the nuts are sleeved on the threaded sections of the double-headed left and right rotating screws, and the front and rear diagonal joint points are respectively connected to the sliders through drilled hole screws.
[0011] Furthermore, the double-headed left-right rotating screw is driven by a motor, and both ends of the double-headed left-right rotating screw are respectively installed in bearing seats, the bearing seats are installed on a fixed bracket, and the fixed bracket is installed on a base plate.
[0012] Furthermore, the cross-section of the fixed bracket is an isosceles triangle, the bearing seat is installed at the vertex of the fixed bracket, and guide wheels are respectively provided at two points of the bottom edge of the fixed bracket. The wheelchair fixing wire rope passes through the guide wheels and is connected to the wheelchair set on the fixed bracket.
[0013] Furthermore, the bottom plate is provided with a cover shell to play a role in dust prevention, safety protection and decoration.
[0014] Furthermore, the width of the bottom plate is smaller than the width of the wheelchair.
[0015] The device of the present invention is used for fixing a wheelchair, and plays the role of fixing the four fixing points of the wheelchair with equal force. The device of the present invention can be installed in a vehicle or on other devices for getting on and off the wheelchair. When fixing the wheelchair in a vehicle, it can be implemented without getting on the vehicle for operation. Not only is the operation convenient, but also, since the fixing forces of the four fixing points of the wheelchair are the same, during the driving of the vehicle, the wheelchair occupant will not feel uncomfortable due to the different fixing forces of the four points of the wheelchair. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is the front view of the present invention.
[0017] Figure 2 It is a top view of the present invention.
[0018] Figure 3It is a partial cross-sectional enlarged view of the fixing method of the two ends of the double-headed left-right rotating screw rod of the present invention.
[0019] Figure 4 It is a schematic diagram of the connection relationship between the nut and the four-bar linkage in the present invention.
[0020] Figure 5 It is a structural schematic diagram of the wire rope guiding mechanism in the present invention.
[0021] In the figure: 1, base plate, 2, fixing bracket, 3, bearing seat, 4, connecting plate, 5, wheelchair fixing wire rope, 6, wheelchair, 7, double-headed left and right rotating screw, 8, slider, 9, four-bar linkage, 10, motor, 11, controller, 12, nut, 13, gasket, 14, guide rail, 15, reamed hole screw, 16, pressure plate, 17, U-shaped guide wheel, 18, cover. DETAILED DESCRIPTION Example 1
[0022] This embodiment provides a front and rear four-claw equal-force wheelchair tightening and fixing device, the structure of which is as follows: Figures 1 to 5 As shown, it includes two wheelchair fixing wire ropes 5 arranged symmetrically in front and back, and hooks for fixing the wheelchair 6 are respectively arranged at both ends of each wheelchair fixing wire rope 5, and the middle part of each wheelchair fixing wire rope 5 is connected to a wire rope guide mechanism, and the wire rope guide mechanism cooperates with the wheelchair fixing wire rope 5 to form a pulley assembly. On the same pulley assembly, according to the principle of force balance, the forces exerted on the two hooks on the same wheelchair fixing wire rope 5 are equal, and each wheelchair fixing wire rope 5 acts on the fixed position of the front and rear wheelchair shafts on one side of the wheelchair 6 through the hook at the same time, which can ensure that the front and rear forces on the same side of the wheelchair 6 are equal. The pulley assembly is connected to the four-bar linkage 9, and the four-bar linkage 9 is arranged in cooperation with the double-headed left and right screw rod 7. The two ends of the double-headed left and right screw rod 7 have threaded sections with opposite rotation directions, and each threaded section is arranged with a movable nut 12, and the nut 12 is hinged to one end of the four-bar linkage.
[0023] The wire rope guide mechanism includes a connecting plate 4, a slider 8, a pressure plate 16 and a U-shaped guide wheel 17. The slider 8 is mounted on a guide rail 14 extending forward and backward and can move forward and backward along the guide rail 14. The connecting plate 4 is mounted on the slider 8. The U-shaped guide wheel 17 is mounted on the connecting plate 4. The wheelchair fixing wire rope 5 passes through the U-shaped guide wheel 17. The pressure plate 16 is arranged on the U-shaped guide wheel 17. The U-shaped guide wheel 17 is a nylon wheel with a U-shaped groove, a bearing in the middle and a U-shaped groove around it. The wheelchair fixing wire rope 5 passes through the U-shaped groove. The U-shaped guide wheel 17 is mounted on the connecting plate 4 and fixed by the pressure plate 16. The pressure plate 16 not only has the function of fixing the U-shaped guide wheel 17, but also has the function of restraining the wheelchair fixing wire rope 5. The front and rear diagonal joints of the four-bar linkage 9 are fixedly mounted on the slider 8 through the connecting plate 4 by the reaming hole screw 15. A gasket 13 is provided at the connection between the reaming hole screw 15 and the front and rear diagonal joints of the four-bar linkage 9.
[0024] The four-bar linkage 9 is composed of four connecting rods connected end to end. The four-bar linkage 9 has four joints: front, rear, left, and right. The left and right diagonal joints are respectively connected to the left and right rotating nuts 12. The nuts 12 are sleeved on the left and right rotating threaded sections of the double-headed left and right rotating screw rod 7. The front and rear diagonal joints are respectively connected to the slider 8 through the reaming screws 15. The double-headed left and right rotating screw rod 7 is connected to two nuts 12. Through the rotation of the screw rod, the distance between the front and rear joints of the four-bar linkage 9 can be controlled, thereby adjusting the distance between the two sliders 8, pulling the pulley assembly installed on the slider 8, so as to achieve the purpose of tightening the wheelchair fixing wire rope 5.
[0025] The double-headed left and right screw rod 7 is driven to rotate by the motor 10, and the motor 10 is connected to the controller 11. A bearing seat 3 is installed at each end of the double-headed left and right screw rod 7, and the bearing seat 3 is installed on the fixed bracket 2. There are two fixed brackets 2, which are symmetrically installed on the bottom plate 1. The width of the bottom plate 1 is smaller than the width of the wheelchair 6. The bottom plate 1 is provided with a cover 18, which plays a role in dust prevention, safety protection and decoration for the bottom plate 1 and the structure thereon. The cross section of the fixed bracket 2 is an isosceles triangle, and the bearing seat 3 is installed at the vertex of the fixed bracket 2. A steering guide wheel is provided at two points on the bottom edge of the fixed bracket 2. The wheelchair fixing wire rope 5 passes through the steering guide wheel to achieve steering and is connected to the wheelchair 6 set on the fixed bracket 2. The outer side of the fixed bracket 2 has a certain slope, which can limit the movement of the wheelchair 6.
[0026] The present invention has two sets of pulley assemblies, each set of pulley assemblies is installed on the guide rail 14 through the slider 8, and the two sets of pulley assemblies are connected by a four-bar linkage 9 in the middle. The controller 11 controls the motor 10 to drive the double-headed left and right screw rods 7 to rotate, and then drives the two nuts 12 installed on the double-headed left and right screw rods 7 to move, so as to adjust the relative position of the slider 8. The two ends of the double-headed left and right screw rods 7 are respectively fixed by a group of bearing seats 3, and the bearing seats 3 are fixed on the fixed bracket 2. When the tension of the wheelchair fixing wire rope 5 on one side is large, the slider 8 on the side with less tension of the wheelchair fixing wire rope 5 moves more, and the side with greater tension moves less. According to the principle of force balance, it is finally positioned at a position where the forces on both sides are equal, so as to achieve the goal of equal tension at the four fixed points on both sides.
[0027] The wheelchair fixing mechanism of the present invention has equal pulling forces at four points, and the wheelchair fixing operation is more convenient than the traditional one, thereby improving the riding comfort, stability and reliability of the wheelchair user, and has a simple structure and is convenient for use on vehicles or other mechanisms.
[0028] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.
Claims
1. A front and rear four-claw equal-force wheelchair tightening and fixing device, characterized in that: The invention comprises two symmetrically arranged wheelchair fixing steel wire ropes, each of which is provided with hooks for fixing the wheelchair at both ends, a steel wire rope guiding mechanism is connected to the middle part of each wheelchair fixing steel wire rope, the steel wire rope guiding mechanism cooperates with the wheelchair fixing steel wire rope to form a pulley assembly, the pulley assembly is connected to a four-bar linkage, the four-bar linkage is cooperated with a double-headed left and right rotating screw rod, the two ends of the double-headed left and right rotating screw rod have threaded sections with opposite rotation directions, each threaded section is provided with a movable nut, and the nut is hinged to one end of the four-bar linkage.
2. According to claim 1, a front and rear four-claw equal-force wheelchair tightening and fixing device is characterized in that: The wire rope guiding mechanism includes a connecting plate, a slider, a pressure plate and a U-shaped guide wheel. The slider is installed on a guide rail extending forward and backward and can move forward and backward along the guide rail. The connecting plate is installed on the slider, and the U-shaped guide wheel is installed on the connecting plate. The wheelchair fixing wire rope passes through the U-shaped guide wheel, and the pressure plate is arranged on the U-shaped guide wheel.
3. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 1, characterized in that: The front and rear diagonal joint points of the four-bar linkage are fixedly mounted on the connecting plate of the slider by means of drilled hole screws.
4. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 3, characterized in that: Gaskets are provided at the connection points between the reaming hole screw and the front and rear diagonal joints of the four-bar linkage.
5. According to claim 1, a front and rear four-claw equal-force wheelchair tightening and fixing device is characterized in that: The four-bar linkage is composed of four connecting rods connected end to end, and has four joint points: front, rear, left and right. The left and right diagonal joint points are respectively provided with nuts, and the nuts are sleeved on the threaded sections of the double-headed left and right screw rods. The front and rear diagonal joint points are respectively connected to the sliders through drilled hole screws.
6. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 1, characterized in that: The double-headed left-right screw rod is driven by a motor, and the two ends of the double-headed left-right screw rod are respectively installed in the bearing seat, the bearing seat is installed on the fixed bracket, and the fixed bracket is installed on the bottom plate.
7. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 6, characterized in that: The cross section of the fixed bracket is an isosceles triangle, the bearing seat is installed at the vertex of the fixed bracket, and guide wheels are respectively provided at two points of the bottom edge of the fixed bracket. The wheelchair fixing wire rope passes through the guide wheel and is connected to the wheelchair arranged on the fixed bracket.
8. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 7, characterized in that: The bottom plate is provided with a cover shell.
9. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 7, characterized in that: The width of the bottom plate is smaller than the width of the wheelchair.