Minimum turning radius measuring instrument for all-wheel differential control electric wheelchair

Abstract

The invention relates to the technical field of measuring tools, in particular to an all-wheel differential control electric wheelchair minimum turning radius measuring instrument which comprises a first measuring mechanism and a second measuring mechanism. Wherein the first measuring mechanism comprises a hollow first measuring rod and two extension rods arranged in the hollow part of the first measuring rod in a sliding manner, the two extension rods are symmetrically arranged on the two sides of the first measuring rod, and the first measuring rod is provided with a mounting hole and is provided with a driving unit for simultaneously driving the two extension rods to move; a clamping and positioning unit is further arranged on the end face of one side of each extension rod; the second measuring mechanism comprises a connecting plate rotationally arranged at the center of the side face of the first measuring rod and a second measuring rod connected with the connecting plate in an inserted mode, and an extending measuring rod is arranged on the second measuring rod in a sliding mode; the central point between the two rear wheels of the wheelchair is determined through the first measuring mechanism, and then the length between the central point and the most protruding position of the wheelchair is determined through the second measuring mechanism, so that the minimum turning radius of the wheelchair is measured.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring tools, in particular to an instrument for measuring the minimum turning radius of an all-wheel differential-controlled electric wheelchair. Background Art

[0002] All-wheel differential control electric wheelchairs, with their flexible steering performance, provide a more convenient way of moving for people with limited mobility. However, accurately measuring the minimum turning radius of all-wheel differential control electric wheelchairs is crucial for evaluating their performance, optimizing their design, and ensuring user safety. According to industry standards, the turning radius of a wheelchair generally refers to the straight-line distance from the axle center to the outermost protruding point when the wheelchair turns on the spot. For a full-differential steering wheelchair, the axle center is usually located at the midpoint of the line connecting the two drive wheels, that is, the geometric center of the two wheels. Therefore, the minimum turning radius of the wheelchair can be measured by measuring the length from the midpoint of the line connecting the two drive wheels of the all-wheel differential control electric wheelchair to the most protruding point of the wheelchair. Traditional measurement methods rely on simple tools, which have the problems of low measurement accuracy and cumbersome operation. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an instrument for measuring the minimum turning radius of an all-wheel differential control electric wheelchair, which is easy to operate and has accurate measurement.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: a minimum turning radius measuring instrument for an all-wheel differential control electric wheelchair, comprising: a first measuring mechanism, the first measuring mechanism comprising a hollow first measuring rod and two extension rods slidably arranged in the hollow part of the first measuring rod, the cross-sectional shape of the hollow part of the first measuring rod is non-circular, the two extension rods are symmetrically arranged on both sides of the first measuring rod, the first measuring rod is provided with a mounting hole and is equipped with a driving unit for simultaneously driving the two extension rods to move, and a clamping and positioning unit is also provided on one end face of each extension rod; a second measuring mechanism, the second measuring mechanism comprising a connecting plate rotatably arranged at the center of the side surface of the first measuring rod and a second measuring rod plugged into the connecting plate, an extension measuring rod being slidably provided on the second measuring rod; the center point between the two rear wheels of the wheelchair is determined by the first measuring mechanism, and the length of the center point from the most protruding position of the wheelchair is determined by the second measuring mechanism, thereby measuring the minimum turning radius of the wheelchair.

[0005] Preferably, the driving unit includes an adjusting screw rotatably arranged in the hollow part of the first measuring rod, the threads on both sides of the adjusting screw are arranged in opposite directions, a first bevel gear is provided with a key-fitting sleeve on the adjusting screw, a second bevel gear is rotatably provided on the first measuring rod and meshes with the first bevel gear, and the rotating shaft of the second bevel gear passes through the side wall of the first measuring rod and is connected to a turntable.

[0006] Preferably, the clamping and positioning unit includes a first clamping plate fixedly arranged on the end surface of the extension rod, an adjusting rod is threadedly connected to the first clamping plate, and a second clamping plate arranged opposite to the first clamping plate is sleeved on the adjusting rod.

[0007] Preferably, a laser is provided at the center of the bottom surface of the first clamping plate.

[0008] Preferably, anti-slip lines are provided on opposite sides of the first clamping plate and the second clamping plate.

[0009] Preferably, a slot is provided on the connecting plate, and the second measuring rod is inserted into the slot.

[0010] Preferably, the second measuring rod is provided with a slot extending to one end face thereof, the extended measuring rod is slidably arranged in the slot, the extended measuring rod and the second measuring rod are statically friction-fitted, and the top surfaces of the extended measuring rod and the second measuring rod are both provided with scale lines.

[0011] After adopting the above structure, the present invention has the following advantages:

[0012] The driving unit of the present invention cooperates with a turntable, a bevel gear and an adjusting screw. By rotating the turntable, the two extension rods can be moved synchronously, so that the length of the first measuring mechanism can be adjusted quickly and conveniently to adapt to the measurement requirements of wheelchairs of different sizes. The connecting plate is arranged at the side center of the first measuring rod, which can directly locate the center position between the two wheels. Then, the distance between the center and the most protruding position of the wheelchair is measured through the cooperation of the second measuring rod and the extended measuring rod, that is, the minimum turning radius is measured, which reduces the steps of manually determining the center point, is easy to use, and improves measurement efficiency.

[0013] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic diagram of the structure of the present invention Figure 1 .

[0016] Figure 2 This is a schematic diagram of the structure of the present invention Figure 2 .

[0017] Figure 3 It is a front view of the present invention.

[0018] Figure 4 It is a schematic diagram of the use state of the present invention.

[0019] As shown in the figure:

[0020] 1. First measuring rod; 2. Second measuring rod; 3. Second bevel gear; 4. First clamping plate; 5. Adjusting rod; 6. Second clamping plate; 7. Connecting plate; 8. Extension rod; 9. Extended measuring rod; 10. Turntable; 11. Laser; 12. First bevel gear; 13. Adjusting screw. DETAILED DESCRIPTION

[0021] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0023] Combine Figure 1 As shown, a minimum turning radius measuring instrument for an all-wheel differential-controlled electric wheelchair includes a first measuring mechanism and a second measuring mechanism.

[0024] Among them, the first measuring mechanism includes a hollow first measuring rod 1 and two extension rods 8 slidably arranged in the hollow part of the first measuring rod 1. The cross-sectional shape of the hollow part of the first measuring rod 1 is non-circular, and the two extension rods 8 are symmetrically arranged on both sides of the first measuring rod 1. The first measuring rod 1 is provided with a mounting hole and is equipped with a driving unit for simultaneously driving the two extension rods 8 to move. A clamping and positioning unit is also provided on one end face of each extension rod 8; the second measuring mechanism includes a connecting plate 7 rotatably arranged at the center of the side of the first measuring rod 1 and a second measuring rod 2 plugged into the connecting plate 7, and an extension measuring rod 9 is slidably provided on the second measuring rod 2; the center point between the two rear wheels of the wheelchair is determined by the first measuring mechanism, and then the length of the center point from the most protruding position of the wheelchair is determined by the second measuring mechanism, that is, the minimum turning radius of the wheelchair is measured.

[0025] In one embodiment of the present invention, the driving unit includes an adjusting screw 13 rotatably arranged in the hollow portion of the first measuring rod 1, and the threads on both sides of the adjusting screw 13 are arranged in opposite directions. The two extension rods 8 are respectively provided with threaded holes that match the adjusting screw 13, and the adjusting screw 13 is threadedly connected to the two extension rods 8 through the threaded holes. A first bevel gear 12 is provided on the adjusting screw 13 with a key fitting sleeve, and a second bevel gear 3 that meshes with the first bevel gear 12 is rotatably provided on the first measuring rod 1, and the rotating shaft of the second bevel gear 3 passes through the side wall of the first measuring rod 1 and is connected to a turntable 10. Specifically, as Figure 3 As shown, the turntable 10 is rotatably installed in the through hole opened on the side wall of the first measuring rod 1 through a bearing. The outer surface of the turntable 10 is provided with anti-slip grooves to facilitate the operator to apply force to rotate. The second bevel gear 3 is coaxially fixedly connected to the turntable 10. When the turntable 10 is rotated, the second bevel gear 3 rotates accordingly, and drives the adjusting screw 13 to rotate through the engagement transmission with the first bevel gear 12. Since the threads on both sides of the adjusting screw 13 are reversed, during the rotation process, the two extension rods 8 can be driven to extend or retract synchronously to both sides along the hollow part of the first measuring rod 1, thereby quickly adjusting the overall length of the first measuring mechanism to adapt to the distance between the two rear wheels of wheelchairs of different sizes.

[0026] In one embodiment of the present invention, the clamping and positioning unit includes a first clamping plate 4 fixedly mounted on the end surface of the extension rod 8, an adjusting rod 5 is threadedly connected to the first clamping plate 4, and a second clamping plate 6 is sleeved on the adjusting rod 5 and arranged opposite to the first clamping plate 4. Specifically, Figure 1As shown, the first clamping plate 4 is in the shape of a rectangular plate, which is fixed to the end face of the extension rod 8 by welding or bolt connection. The adjusting rod 5 vertically passes through the first clamping plate 4 and is provided with a knob at one end. The second clamping plate 6 is arranged parallel to the first clamping plate 4, and the shapes of the opposite sides of the two are adapted to each other. When in use, the rear wheel of the wheelchair is placed between the first clamping plate 4 and the second clamping plate 6. The adjusting rod 5 is driven to rotate by rotating the knob. The second clamping plate 6 is moved closer to or away from the first clamping plate 4 along the adjusting rod 5 by utilizing the principle of thread transmission, thereby clamping and fixing the rear wheel of the wheelchair, thereby realizing the positioning connection between the measuring device and the wheelchair.

[0027] In one embodiment of the present invention, a laser 11 is provided at the center of the bottom surface of the first clamping plate 4. Specifically, Figure 2 As shown, the laser 11 is embedded in the mounting groove opened in the center of the bottom surface of the first clamping plate 4. The size of the mounting groove is adapted to the laser 11. The laser 11 is fixed in the mounting groove by screws or glue. The emitting end of the laser 11 faces downward and can project a clear laser marking line downward. When the first measuring mechanism is fixed on the wheelchair, the laser marking line can intuitively indicate whether the installation of the first measuring mechanism is aligned with the center of the wheel.

[0028] In one embodiment of the present invention, anti-slip patterns are provided on the opposing sides of the first clamping plate 4 and the second clamping plate 6. Specifically, the anti-slip patterns are formed using a knurling process and are distributed in a grid pattern on the opposing sides of the first clamping plate 4 and the second clamping plate 6. These anti-slip patterns effectively increase the friction between the clamping plates and the rear wheels of the wheelchair, preventing relative displacement between the measuring device and the wheelchair due to slight movement of the wheelchair or external interference during measurement, thereby ensuring the stability of the measurement process and the reliability of the measurement results.

[0029] In one embodiment of the present invention, a slot is provided on the connecting plate 7, and the second measuring rod 2 is inserted into the slot. Figure 1 As shown, the connecting plate 7 is in the shape of a rectangular plate, and the slot is a rectangular through slot, the length direction of which is consistent with the length direction of the connecting plate 7, and the width and depth of the slot are adapted to the size of the second measuring rod 2. When the angle of the second measuring rod 2 needs to be adjusted, the second measuring rod 2 can be rotated and adjusted to the appropriate angle by directly rotating the connecting plate 7.

[0030] In one embodiment of the present invention, a slot extending to one end surface of the second measuring rod 2 is provided, in which an extension measuring rod 9 is slidably arranged. The extension measuring rod 9 and the second measuring rod 2 are in a static friction fit, and scale lines are provided on the top surfaces of the extension measuring rod 9 and the second measuring rod 2. Specifically, Figure 4As shown, the slot on the second measuring rod 2 is a rectangular slot, and its width is adapted to the width of the extended measuring rod 9. After the extended measuring rod 9 is inserted into the slot, there is a certain static friction between the two, so that the extended measuring rod 9 can maintain its current position when no external force is applied. The scale lines on the top surfaces of the extended measuring rod 9 and the second measuring rod 2 are both in millimeters, and the scales are clear and accurate. When measuring, according to actual measurement requirements, pull the extended measuring rod 9 to extend it from the slot of the second measuring rod 2 to an appropriate length. By observing the scale lines on the top surfaces of the extended measuring rod 9 and the second measuring rod 2, the total length of the two can be accurately read, thereby accurately measuring the minimum turning radius of the wheelchair.

[0031] In summary, the all-wheel differential control electric wheelchair minimum turning radius measuring instrument provided by the present invention realizes rapid positioning of the wheelchair and accurate measurement of the turning radius through the cooperation between the first measuring mechanism and the second measuring mechanism, as well as the various components. The device has a simple structure and is easy to operate. It can adapt to the measurement needs of all-wheel differential control electric wheelchairs of different sizes and types, and effectively improves the measurement efficiency and accuracy.

[0032] All standard parts used in the present invention can be purchased commercially, and special-shaped parts can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as bolts, rivets, welding, etc. that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. In addition, the circuit connections adopt conventional connection methods in the prior art and will not be described in detail here. Any matters not described in detail in this specification belong to the prior art known to professionals in this field.

[0033] The present invention and its embodiments are described above. This description is not restrictive. What is shown in the full text is only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without creatively designing, they shall all fall within the scope of protection of the present invention.

Claims

1. An all-wheel differential control electric wheelchair minimum turning radius measuring instrument, characterized in that: include: A first measuring mechanism, comprising a first hollow measuring rod and two extension rods slidably arranged in the hollow portion of the first measuring rod, wherein the hollow portion of the first measuring rod has a non-circular cross-sectional shape, and the two extension rods are symmetrically arranged on both sides of the first measuring rod. The first measuring rod is provided with a mounting hole and is equipped with a driving unit for simultaneously driving the two extension rods to move. A clamping and positioning unit is also provided on one end surface of each extension rod; A second measuring mechanism, the second measuring mechanism comprising a connecting plate rotatably arranged at the center of the side surface of the first measuring rod and a second measuring rod plug-connected to the connecting plate, an extension measuring rod being slidably provided on the second measuring rod; The first measuring mechanism is used to determine the center point between the two rear wheels of the wheelchair, and the second measuring mechanism is used to determine the distance from the center point to the most protruding position of the wheelchair to measure the turning radius of the wheelchair.

2. The all-wheel differential control electric wheelchair minimum turning radius measuring instrument according to claim 1, characterized in that: The driving unit includes an adjusting screw rotatably arranged in the hollow part of the first measuring rod, the threads on both sides of the adjusting screw are arranged in opposite directions, a first bevel gear is provided on the adjusting screw with a key fitting sleeve, a second bevel gear is rotatably provided on the first measuring rod and meshes with the first bevel gear, and the rotating shaft of the second bevel gear passes through the side wall of the first measuring rod and is connected to a turntable.

3. The all-wheel differential control electric wheelchair minimum turning radius measuring instrument according to claim 2, characterized in that: The clamping and positioning unit includes a first clamping plate fixedly arranged on the end surface of the extension rod, an adjusting rod is threadedly connected to the first clamping plate, and a second clamping plate is sleeved on the adjusting rod and arranged opposite to the first clamping plate.

4. The all-wheel differential control electric wheelchair minimum turning radius measuring instrument according to claim 3, characterized in that: A laser is provided at the center of the bottom surface of the first clamping plate.

5. The all-wheel differential control electric wheelchair minimum turning radius measuring instrument according to claim 4, characterized in that: Anti-slip patterns are provided on opposite sides of the first clamping plate and the second clamping plate.

6. The all-wheel differential control electric wheelchair minimum turning radius measuring instrument according to claim 5, characterized in that: The connecting plate is provided with a slot, and the second measuring rod is inserted into the slot.

7. The all-wheel differential control electric wheelchair minimum turning radius measuring instrument according to claim 6, characterized in that: The second measuring rod is provided with a slot extending to one end face thereof, in which the extended measuring rod is slidably arranged, and the extended measuring rod and the second measuring rod are in static friction fit, and the top surfaces of the extended measuring rod and the second measuring rod are both provided with scale lines.

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