TWI674888B - Guiding and anti-backlash structure for connecting a wheelchair and a control stem of the wheelchair - Google Patents

Abstract

The invention provides a guide anti-backlash structure for combining a wheelchair and a control lever thereof. The control lever system uses the guide anti-backlash structure to be assembled on a wheelchair. The guide anti-backlash structure mainly includes: an assembly positioning frame, On the front side of the wheelchair; a limit recess is provided at the front of the assembly positioning frame; a snap bar is provided on the control lever, and the latch bar is selectively pivoted in the limit recess and constitutes the control The lever is rotatable and swingable relative to the assembly positioning frame; and a pair of anti-backlash positioning members are respectively provided at both ends of the clamping rod to prevent the control lever from swinging left and right relative to the assembly positioning frame and guide the The card post quickly corresponds to the effect of being set in the limiting recess.

Description

Guide anti-backlash structure for combining wheelchair with control lever

The present invention relates to a wheelchair; in particular, to an innovative structure type revealer that conveniently and quickly detaches and assembles a joystick through a guide anti-backlash structure.

According to the general wheelchair is available for disabled users, but because the general wheelchair is a manual wheelchair, it means that the user must push the wheel body by himself or by the push of others to achieve the purpose of advancement, not only It is troublesome and laborious to use, and it is also laborious for users.

Based on the above problems, some auxiliary power structures that can be added to existing manual wheelchairs have been developed by the industry to make the manual wheelchairs a new type of self-propelled structure. In response, the manual wheelchairs are Equipped with an auxiliary power structure, when a disabled user uses it, the wheelchair can be driven forward by driving the motor of the auxiliary power structure, which not only saves the trouble of pushing the wheelchair by hand, but also saves labor and convenience. In addition, the use of The user can also use the handle to control the direction of the wheel body, and the overall operation mode is simple and convenient.

However, in a comprehensive overview of wheelchairs with auxiliary power structures, most of the auxiliary power structures have a handlebar and a motor. The handlebar set is located on the front side of the manual wheelchair and is electrically driven by the motor, which can be transformed into The self-propelled control structure allows the user to control the steering of the wheelchair by controlling the handlebar.

However, the conventional manual wheelchair and the handlebar are still incomplete for the design of the connection structure, and there are still a lot of overall assembly components, which are inconvenient and time-consuming to assembly. Furthermore, in order to quickly and easily assemble the handlebar on the On a wheelchair, a predetermined gap must be left between the corresponding assembly structures of the two. After assembly, the predetermined gap makes the handlebar and the wheelchair not tightly connected, which is likely to cause instability and shaking, and further It may affect the actual operation feeling of the handlebar.

In addition, when assembling, the control lever needs to be away from the manual wheelchair a predetermined distance, and then the control lever is moved toward the front of the manual wheelchair and combined, but this assembly method requires the user to extend his arm to operate, and at the same time Lifting an operating lever with a considerable weight, in addition to making it difficult and easy for the user to assemble, also directly faces the problem that the manual wheelchair and the handlebar cannot be easily and accurately aligned.

Therefore, there is still considerable room for development and improvement, and this is what this creation wants to explore further.

The main object of the present invention is to provide a guide anti-backlash structure for combining a wheelchair with a control lever thereof.

Based on the foregoing object, the present invention provides a guide anti-backlash structure combining a wheelchair and a control lever thereof. The control lever system uses the guide anti-backlash structure to be assembled on a wheelchair. The guide anti-backlash structure includes: an assembly positioning frame, On the front side of the wheelchair; a limiting recess is provided at the front end of the assembly positioning frame in the form of a tiger mouth section, and the limiting recess has a concave arc segment; a clip post is transverse to the limiting recess. The control lever is arranged on the control lever, and the clip lever is selectively pivoted in the limiting recess, and constitutes a rotatable swinging motion of the control lever relative to the assembly positioning frame, and has an assembly position and a lock position; In another aspect, at least a part of the peripheral edge of the cross section of the clip pole is matched with the limiting recess to have a circular arc segment, and a tangent line formed by two ends of the circular arc segment to the center point of the clip pole is along the circle. The clamping angle of the arc segment is greater than the clamping angle along the concave arc segment formed by the tangent line formed by the two ends of the concave arc segment and the center point of the limiting recess; and a pair of anti-backlash positioning members are respectively provided on the card. Both ends of the post, and each of the anti-backlash positioning member packages : A clip portion extends from the radial direction of the clip pole. When the clip rod pivot group is in the limit recess, the clip portion is forced to abut the assembly positioning frame near the limit position. The position of the recessed portion prevents the control lever from swinging left and right with respect to the assembly positioning frame; a guide portion is extended outward from the other end of the clip portion and has a tapered structure to form a guide inclined surface for guiding The card connecting rod is quickly set correspondingly into the limiting recess; and a turning portion connects the guide portion and the clip portion so that the guide portion and the clip portion extend in different directions.

The main effect and advantage of the present invention is that the anti-backlash positioning member is used to guide and limit the clamping rod pivot group in the limiting recess, thereby avoiding the difficulty of precise alignment between the conventional manual wheelchair and the handle bar, which causes assembly. Inconvenient and time-consuming problems; and can effectively eliminate the gap between the joystick and the assembled positioning frame, so that the joystick is tightly connected to the wheelchair, and is particularly practical and progressive.

Please refer to FIG. 1 to FIG. 6, which are preferred embodiments of the present invention for a guide and anti-backlash structure combining a wheelchair and a control lever thereof. However, these embodiments are for illustrative purposes only and are not subject to this in patent applications. Structural restrictions; the guide anti-backlash structure for combining a wheelchair with its control lever, the control lever 10 is used in the guide anti-backlash structure 20 to match the wheelchair 30, and the guide anti-backlash structure 20 includes: an assembly positioning A frame 21 is provided on the front side of the wheelchair 30; a limit recess 22 is provided at the front end of the assembly and positioning frame 21 in the form of a tiger mouth section, and the limit recess 22 has a concave arc section 221; a clip post 23, which is horizontally arranged on the control lever 10 corresponding to the limit recess 22, and the latching lever 23 is selectively pivoted in the limit recess 22 and constitutes the control lever 10 relative to the assembly positioning frame 21. It has a rotatable pendulum dynamic pattern, and has an assembly position and a locked position; and a pair of anti-backlash positioning members 24 are respectively provided at both ends of the clamping rod 23, and each of the anti-backlash positioning members 24 includes: a clip The latching portion 25 extends from the radial direction of the latching rod 23, and when the latching rod 23 is pivoted at the limit position When in the recessed portion 22, the clamping portion 25 abuts against the position of the assembly positioning frame 21 adjacent to the limit recessed portion 22, thereby preventing the control lever 10 from shaking left and right relative to the assembly positioning frame 21; a guide portion 26 Is extended outward from the other end of the clip portion 25 and has a tapered structure to form a guide slope 261 for guiding the latching rod 23 to be quickly and correspondingly set into the limit recess 22; and A turning portion 27 connects the guiding portion 26 and the clamping portion 25 so that the guiding portion 26 and the clamping portion 25 extend in different directions (as shown in FIG. 4). Each of the anti-backlash positioning members 24 is made of a compressible material.

In this example, each of the anti-backlash positioning members 24 has a circular structure, which is used for guiding the clamping rods 23 to be accurately aligned and pivoted in the limiting recess 22. As shown in FIGS. 7 and 8, in other embodiments, at least a part of the periphery of each of the anti-backlash positioning members 24 has a convex arc segment 241 that cooperates with the limit recess 22, and the convex arc segment 241 has a convex arc segment 241. The two tangent lines 243 formed by the two end points 242 and the center point of the anti-backlash positioning member 24 are formed along the convex arc segment 241 at a greater angle than the two end points 222 of the concave arc segment 221 and the center point of the limit recess 22 The two tangent lines 223 are along the included angle of the concave arc segment 221, and each of the anti-backlash positioning members 24 is similarly provided for guiding the clamping rods 23 to be accurately aligned and pivoted to the limiting recess 22. Accordingly, each of the anti-backlash positioning members 24 has a fan-shaped structure.

In addition, each of the anti-backlash positioning members 24 is further provided with an indicating portion (not shown) for a user to judge the direction and position of the corresponding pivot group of the latching rod 23 on the limiting recessed portion 22.

With the above structural composition design, the operation of the present invention is described as follows: As shown in Figures 2 and 5, when the control lever 10 is set away from the wheelchair 30 for a predetermined distance, the control lever 10 is directed toward The wheelchair 30 moves in the front direction. Next, the guide inclined surface 261 (as shown in FIG. 4) of each of the anti-backlash positioning members 24 contacts the assembly positioning frame 21 first, and is used to guide the clamping rods 23 to be quickly and correspondingly set to the limiting recesses. Within 22. Therefore, in the present invention, the anti-backlash positioning member 24 is used to guide and limit the latching rod 23 to the limiting recess 22, thereby avoiding the difficulty of accurate alignment between the conventional manual wheelchair and the handle bar, which causes inconvenient assembly. Time-consuming problems.

Finally, as shown in FIG. 6, when the latching rod 23 is pivoted in the limiting recess 22, the distance between the two clamping portions 25 (as shown in FIG. 4) is equal to the assembly. The distance between the two ends of the positioning frame 21 makes each of the clamping portions 25 abut tightly against the position of the assembly positioning frame 21 near the limit recess 22, thereby preventing the control lever 10 from swinging left and right relative to the assembly positioning frame 21. The gap between the control lever 10 and the assembly positioning frame 21 can be effectively eliminated, so that the control lever 10 can be tightly connected to the wheelchair 30.

As shown in FIG. 9, in other embodiments, at least a part of the peripheral edge of the cross section of the latching rod 23 is fitted with the limiting recess 22 to have a circular arc segment 231, and two ends of the circular arc segment 231 The tangent line 233 formed from the point 232 to the center point of the post 23 is greater than the tangent line 223 formed by the arc 231 along the circular arc segment 231, which is greater than the two end points 222 of the concave arc segment 221 to the center of the limit recess 22 Along the clamping angle of the concave arc segment 221, the latching rod 23 can also be correspondingly assembled in the limiting recess 22.

10‧‧‧ joystick

20‧‧‧Guide anti-backlash structure

21‧‧‧Assembled positioning frame

22‧‧‧ limit recess

221‧‧‧ concave arc

23‧‧‧Card Post

231‧‧‧arc segment

24‧‧‧ Anti-backlash positioning member

241‧‧‧ convex arc

25‧‧‧clamping part

26‧‧‧Guide

261‧‧‧Guide slope

27‧‧‧ turning section

30‧‧‧ Wheelchair

Endpoints 222, 232, 224‧‧‧

223, 233, 243‧‧‧tangent

FIG. 1 is a schematic diagram of a preferred embodiment of the present invention. Figure 2 is an exploded view following Figure 1. FIG. 3 is an exploded view of the corresponding anti-backlash structure of the present invention and the corresponding control lever of the clamping rod. FIG. 4 is a cross-sectional view of the guide anti-backlash structure and the clamping rod of the present invention. Fig. 5 is a side view of Fig. 2; Fig. 6 is an action diagram following Fig. 5; FIG. 7 is a schematic diagram of an assembling process according to another embodiment of the present invention. Figure 8 is a side view after assembly of Figure 7; Fig. 9 is a schematic diagram of another embodiment of the present invention.

Claims (6)

A guide anti-backlash structure for combining a wheelchair with a control lever, the control lever is assembled on a wheelchair by using the guide anti-backlash structure, and the guide anti-backlash structure includes: an assembly positioning frame, which is arranged on the wheelchair Front side; a limiting recess is provided at the front end of the assembly positioning frame in the form of a tiger mouth section, and the limiting recess has a concave arc segment; a snap bar corresponding to the limiting recess is arranged laterally on the On the control lever, the latching lever is selectively pivoted in the limiting recess, and constitutes a rotatable swinging motion of the control lever relative to the assembly positioning frame, and has an assembly position and a locking position; and further, At least a part of the peripheral edge of the cross section of the clip pole is matched with the limiting recess to have a circular arc segment, and a tangent line formed by two ends of the circular arc segment to the center point of the clip pole is formed along the circular arc segment. The clamping angle is greater than the clamping angle formed by the tangent line formed by the two ends of the concave arc segment to the center point of the limiting recessed portion along the concave arc segment; and a pair of anti-backlash positioning members are respectively provided on the clamping posts. Both ends, and each of the anti-backlash positioning members includes: a clip The clamping portion extends from the radial direction of the clamping rod. When the clamping rod is pivoted in the limiting recess, the clamping portion is forced to abut the position of the assembly positioning frame adjacent to the limiting recess. Thereby, the control lever is prevented from shaking left and right with respect to the assembly positioning frame; a guide portion is extended outward from the other end of the clip portion and has a tapered structure to form a guide slope for guiding the snap connection The lever is quickly and correspondingly set into the limiting recess; and a turning portion connects the guide portion and the clip portion so that the guide portion and the clip portion extend in different directions. The guide anti-backlash structure for combining a wheelchair with a control lever as described in item 1 of the scope of the patent application, wherein each of the anti-backlash positioning members is a compressible material. According to the guide anti-backlash structure for combining a wheelchair and a control lever thereof described in Item 2 of the scope of the patent application, wherein at least a part of the periphery of each of the anti-backlash positioning members has a convex arc segment that cooperates with the limiting recess, The angle formed by the two ends of the convex arc segment to the center point of the anti-backlash positioning member along the convex arc segment is greater than the angle formed by the two ends of the concave arc segment to the center point of the limit recess. The clamping angle of the concave arc segment, and each of the anti-backlash positioning members is used to guide the precise alignment of the clamping rod and pivotally set in the limiting concave portion. As described in item 3 of the scope of the patent application, a guide anti-backlash structure for combining a wheelchair with a control lever thereof, wherein each of the anti-backlash positioning members has a fan-shaped structure. As described in item 3 of the scope of the patent application, a guide anti-backlash structure for combining a wheelchair with a control lever thereof, wherein each of the anti-backlash positioning members has a circular structure. As described in item 4 or 5 of the scope of the patent application, a guide anti-backlash structure for combining a wheelchair with a control lever thereof, wherein each of the anti-backlash positioning members is provided with an indicating portion for a user to judge the corresponding pivot group of the card connecting rod The direction and position of the limiting recess.