Folding wheelchair

Abstract

The present invention discloses a folding wheelchair, comprising a base frame, a first support rod, a second support rod, a seat body and a third support rod; the lower end of the first support rod is pivotally connected to the front end of the base frame, and the upper end of the first support rod is pivotally connected to the lower end of the third support rod; the lower end of the second support rod is pivotally connected to the rear end of the base frame, the upper end of the second support rod is pivotally connected to the front end of the seat body, and the third support rod is pivotally connected to the rear end of the seat body; the first support rod and the second support rod are cross-arranged, and a slide groove is provided in the middle part of one of the first support rod and the second support rod along its length direction, and the other of the first support rod and the second support rod is provided with a central axis, and the central axis is slidably inserted into the slide groove, so that the first support rod and the second support rod can slide against each other to achieve folding or unfolding. The folding wheelchair of the present invention has the advantages of simple structure and convenient use.

Description

Technical Field

[0001] The invention relates to a folding wheelchair, in particular to a folding wheelchair with simple structure and convenient use. Background Art

[0002] Wheelchairs are generally large in size, and are usually folded to reduce their size for easy storage. However, the existing foldable wheelchair support structure is relatively complex in design, and the folding action is relatively complicated, and the operation is cumbersome. Therefore, for some people with limited mobility or older age, folding these wheelchairs requires a lot of effort; therefore, the existing foldable wheelchairs bring inconvenience to these people with limited mobility to a certain extent. Summary of the invention

[0003] The object of the present invention is to provide a folding wheelchair which has a simple structure and is easy to use.

[0004] In order to achieve the above-mentioned purpose, the foldable wheelchair provided by the present invention includes a base frame, a first support rod, a second support rod, a seat body and a third support rod; the lower end of the first support rod is pivotally connected to the front end of the base frame, and the upper end of the first support rod is pivotally connected to the lower end of the third support rod; the lower end of the second support rod is pivotally connected to the rear end of the base frame, the upper end of the second support rod is pivotally connected to the front end of the seat body, and the third support rod is pivotally connected to the rear end of the seat body; the first support rod and the second support rod are cross-arranged, and a sliding groove is opened in the middle part of one of the first support rod and the second support rod along its own length direction, and the other of the first support rod and the second support rod is provided with a central axis, and the central axis is slidably inserted in the sliding groove, so that the first support rod and the second support rod can slide against each other to achieve folding or unfolding.

[0005] The present invention provides a first support rod and a second support rod, and a slide groove is provided in the middle part of one of the two, and a central axis is provided in the middle part of the other, and the central axis is slidably provided in the slide groove, so that the first support rod and the second support rod can be cross-expanded or folded; in addition, the upper end of the first support rod is pivotally connected to the lower end of the third support rod, and the upper end of the third support rod is pivotally connected to the rear end of the seat body, and the upper end of the second support rod is pivotally connected to the front end of the seat body, so that a deformable and foldable quadrilateral structure can be formed among the first support rod, the second support rod, the third support rod and the seat body. Therefore, the entire wheelchair frame can be folded or unfolded, the structure is simple, and the various rods can be linked to each other. Only one of the first support rod and the second support rod needs to be driven to achieve the purpose of one-time folding or unfolding, which is very convenient to use.

[0006] Preferably, the foldable wheelchair further comprises an adjusting device, which is arranged between the first support rod and the second support rod to lock the first support rod and the second support rod in a folded state or an unfolded state. The adjusting device can be used to locate the relative position of the first support rod and the second support rod, thereby achieving the purpose of locking and ensuring the stability of the foldable wheelchair after unfolding.

[0007] Preferably, the adjustment device is a telescope, the extended end of which is pivotally connected to the lower end of the first support rod, and the other end of which is pivotally connected to the central axis. The telescope can be used to drive the first support rod and the second support rod to automatically adjust their positions without manual operation, thereby achieving automatic expansion and folding.

[0008] Specifically, the telescopic device is provided with a guide wheel, a guide rail is provided on one side of the first support rod along the length direction, and the guide wheel is rollingly arranged on the guide rail. The cooperation between the guide wheel and the guide rail can make the telescopic device, the first support rod and the second support rod run more stably.

[0009] Preferably, the front end of the chassis is provided with front wheels, and the rear end is provided with rear wheels.

[0010] Preferably, a bracket is slidably and telescopically provided at the front end of the chassis. The bracket can be extended from the chassis to accommodate the feet when in use, and can be retracted into the chassis when not in use, thereby reducing the occupied volume and making the folded frame structure more compact.

[0011] Specifically, foldable wings are provided on both sides of the bracket, which can be opened when in use to accommodate the feet, and can be folded up when not in use to reduce the occupied volume and make the folded frame structure more compact.

[0012] Preferably, the upper end of the third support rod extends upward to form a back support rod.

[0013] Specifically, the folding wheelchair further comprises a fourth support rod, the rear end of which is pivotally connected to the upper end of the back support rod.

[0014] Specifically, the folding wheelchair further comprises a support assembly, the upper end of the support assembly is pivotally connected to the fourth support rod, and the lower end of the support assembly is pivotally connected to the seat body. By providing the support assembly and the fourth support rod, the armrest can follow the opening or folding of the folding wheelchair without secondary operation, thereby improving the convenience of use.

[0015] Specifically, the support assembly includes an outer sleeve and an inner shaft, the inner shaft is telescopically sleeved on the outer sleeve, the lower end of the inner shaft is pivotally connected to the seat body, and the upper end of the outer sleeve is pivotally connected to the fourth support rod. Through the cooperation between the outer sleeve and the inner shaft, the height of the fourth support rod can be adjusted, thereby enhancing applicability and improving riding comfort.

[0016] Specifically, the support assembly includes a locking shaft, and locking holes are arranged on the side walls of the outer sleeve and the inner shaft. The locking shaft can be inserted into or withdrawn from the two locking holes to lock or release the outer sleeve and the inner shaft.

[0017] Specifically, a handrail is slidably provided on the fourth support rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the foldable wheelchair of the present invention when it is unfolded.

[0019] Figure 2 It is another stereoscopic view of the foldable wheelchair of the present invention when it is unfolded.

[0020] Figure 3 It is a side view of the foldable wheelchair of the present invention when it is unfolded.

[0021] Figure 4 yes Figure 2 Enlarged view of part a.

[0022] Figure 5 It is a motion state diagram of each rod of the foldable wheelchair of the present invention when it is folded.

[0023] Figure 6 It is a state diagram of the foldable wheelchair of the present invention after being folded. DETAILED DESCRIPTION

[0024] In order to explain the technical content, structural features and achieved effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0025] like Figures 1 to 3As shown, the folding wheelchair 100 of the present invention comprises a base frame 1, a first support rod 2, a second support rod 3, a seat body 4 and a third support rod 5; the first support rod 2, the second support rod 3 and the third support rod 5 are arranged between the seat body 4 and the base frame 1 and are located on both sides of the base frame 1, and the two sides of the folding wheelchair 100 are completely symmetrical. This application takes one side as an example for explanation. The lower end of the first support rod 2 is pivoted to the front end of the base frame 1 to form a first pivot point A; the upper end of the first support rod 2 is pivoted to the lower end of the third support rod 5 to form a second pivot point B; the lower end of the second support rod 3 is pivoted to the rear end of the base frame 1 to form a third pivot point C; the upper end of the second support rod 3 is pivoted to the front end of the seat body 4 to form a fourth pivot point D; the third support rod 5 is pivoted to the pivot seat at the rear end of the seat body 4 to form a fifth pivot point E. A deformable and foldable first quadrilateral structure is formed between the first support rod 2, the second support rod 3, the third support rod 5 and the seat body 4. The first support rod 2 and the second support rod 3 are arranged crosswise, and a slide groove 21 is provided on the side of one of the first support rod 2 and the second support rod 3 along its length direction, and a central axis 31 is provided on the other of the first support rod and the second support rod 3. In the present application, the slide groove 21 is provided on the first support rod 2, and the central axis 31 is provided on the second support rod 3. The central axis 31 is located between the two second support rods 3, and the middle part of the second support rod 3 is bent to protrude toward the inner side of the folding wheelchair 100, so that a structure with a narrow middle and wide ends is formed between the two second support rods 3, and the two ends of the central axis 31 are arranged at the protruding points of the two second support rods 3. The first support rod 2 is a U-shaped structure, and the rods on both sides are located between the two second support rods 3. The central axis 31 is slidably inserted into the slide groove 21, so that the first support rod 2 and the second support rod 3 can slide against each other to achieve folding or unfolding.

[0026] See also Figures 2 to 4The folding wheelchair 100 also includes an adjustment device, which is arranged between the first support rod 2 and the second support rod 3 so that the first support rod 2 and the second support rod 3 are locked in a folded state or an unfolded state. The relative position of the first support rod 2 and the second support rod 3 can be positioned by the adjustment device, so as to achieve the purpose of locking and ensure the stability of the folding wheelchair 100 after unfolding. The adjustment device described in the present application is a telescopic device 6, which is a telescopic driving device that automatically extends and retracts after power is turned on. The telescopic device 6 is located between the two rods of the first support rod 2. The extended end of the telescopic device 6 is pivotally connected to the lower end of the first support rod 2 through a rotating shaft 22, and the other end of the telescopic device 6 is connected to the central axis 31 so that it is pivotally connected to the second support rod 3. The telescopic device 6 described in the present application is an electric push rod, which is electrically connected to the power supply and circuit control board arranged on the base to realize automatic start and stop. The telescopic device 6 can be used to drive the first support rod 2 and the second support rod 3 to automatically adjust their positions without manual operation, thereby realizing automatic unfolding and folding. Guide wheels 61 are provided on both sides of the telescopic device 6, and the guide wheels 61 are coaxially arranged with the central axis 31. A guide rail 23 is provided on the inner side of the first support rod 2 along the length direction, and the guide wheels 61 are rollingly arranged on the guide rail 23. The cooperation between the guide wheels 61 and the guide rail 23 can make the operation of the telescopic device 6, the first support rod 2 and the second support rod 3 more stable. The front end of the base frame 1 has an ear 11 extending out of the base frame 1, and the ear 11 is provided with a front wheel 7, and the front wheel 7 is a universal wheel. The rear end of the base frame 1 is provided with a rear wheel 8, and the rear wheel 8 is driven by a motor.

[0027] Please see again Figure 1 The front end of the base frame 1 is provided with a bracket 9 in a sliding and telescopic manner. Foldable wings 91 are provided on both sides of the bracket 9, and the inner side of the wing 91 is pivotally connected to the bracket 9 through a rotating shaft 92, so that the wing 91 can be flipped relative to the bracket 9. The bracket 9 and the wing 91 can be opened when in use to accommodate the feet, and can be folded up when not in use to reduce the occupied volume and make the frame structure more compact after folding.

[0028] For example Figure 1 and Figure 3As shown, the upper end of the third support rod 5 extends upward to form a backrest support rod 51. The folding wheelchair 100 also includes a fourth support rod 110 and a support assembly 120. The rear end of the fourth support rod 110 is pivoted to the upper end of the backrest support rod 51 to form a sixth pivot point F. The upper end of the support assembly 120 is pivoted to the fourth support rod 110 to form a seventh pivot point G, and the lower end of the support assembly 120 is pivoted to the seat body 4 to form an eighth pivot point H. An armrest rod 130 is slidably provided on the fourth support rod 110. By providing the support assembly 120 and the fourth support rod 110, the armrest can follow the opening or folding of the folding wheelchair 100 without secondary operation, thereby improving the convenience of use. A deformable second quadrilateral structure is formed between the third support rod 5, the fourth support rod 110, the support assembly 120 and the seat body 4. The first quadrilateral structure and the second quadrilateral structure are linked to each other.

[0029] Please see again Figure 3 The support assembly 120 is telescopically adjustable, and includes an outer sleeve 121, an inner shaft 122, a fixed sleeve 123, an elastic member and a locking shaft. The inner shaft 122 is telescopically sleeved on the outer sleeve 121, the lower end of the inner shaft 122 is pivotally connected to the seat body 4, and the upper end of the outer sleeve 121 is pivotally connected to the fourth support rod 110. The fixed sleeve 123 is fixed to the outside of the outer sleeve 121, the locking shaft is arranged on the fixed sleeve 123, and the elastic member is arranged on the locking shaft and the fixed sleeve 123. The side walls of the outer sleeve 121 and the inner shaft 122 are provided with locking holes, and the locking shaft can be inserted into the two locking holes under the action of the elastic member to lock the outer sleeve 121 and the inner shaft 122. When the locking shaft is pulled out of the locking hole, the outer sleeve 121 and the inner shaft 122 can be released and adjusted. Through the cooperation between the outer sleeve 121 and the inner shaft 122, the height of the fourth support rod 110 can be adjusted, thereby enhancing applicability and improving riding comfort.

[0030] Combining the above and Figure 5 and Figure 6 The folding and unfolding process of the folding wheelchair 100 of the present invention is described in detail below:

[0031] When the folding wheelchair 100 needs to be folded, the telescopic device 6 is started to shrink the telescopic end of the telescopic device 6, and the telescopic device 6 drives the central axis 31 to move downward along the slide groove 21. At this time, the second support rod 3 moves relative to the first support rod 2 and moves toward the bottom frame 1. At the same time, the quadrilateral structure formed by the first support rod 2, the second support rod 3, the third support rod 5 and the seat body 4 is deformed, the lower end of the third support rod 5 swings backward, and the front end of the seat body 4 moves forward and downward, so that the seat body 4 moves downward as a whole and moves closer to the bottom frame 1. In addition, the upper end of the third support rod 5 swings forward, driving the fourth support rod 110 and the support assembly 120 to swing and move closer to the seat body 4. Finally, when the telescopic end of the telescope 6 is completely retracted, the central axis 31 slides from the upper end of the slide slot 21 to the lower end of the slide slot 21, and the first support rod 2, the second support rod 3, the third support rod 5, the seat body 4, the fourth support rod 110 and the support assembly 120 are completely folded together. When the folding wheelchair 100 needs to be unfolded, it is only necessary to control the telescopic end of the telescope 6 to open, so that the first support rod 2, the second support rod 3, the third support rod 5, the seat body 4, the fourth support rod 110 and the support assembly 120 can be fully unfolded. After the telescopic end of the telescope 6 is fully extended, the folding wheelchair 100 can be unfolded and locked in the unfolded state.

[0032] The present invention provides a first support rod 2 and a second support rod 3, so that a slide groove 21 is provided in the middle part of one of the two, and a central axis 31 is provided in the middle part of the other. By making the central axis 31 slidably set in the slide groove 21, the first support rod 2 and the second support rod 3 can be cross-expanded or folded; in addition, by making the upper end of the first support rod 2 pivotally connected to the lower end of the third support rod 5, and the upper end of the third support rod 5 pivotally connected to the rear end of the seat body 4, and the upper end of the second support rod 3 pivotally connected to the front end of the seat body 4, a deformable and foldable quadrilateral structure can be formed among the first support rod 2, the second support rod 3, the third support rod 5 and the seat body 4. Therefore, the entire wheelchair frame can be folded or unfolded, the structure is simple, and the various rods can be linked to each other. Only one of the first support rod 2 and the second support rod 3 needs to be driven to achieve the purpose of one-time folding or unfolding, which is very convenient to use.

[0033] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A folding wheelchair, characterized in that: The 3rd support rod is a support rod of the first embodiment of the present invention, and the 3rd support rod is a support rod of the second embodiment of the present invention. The foldable wheelchair further comprises an adjusting device, wherein the adjusting device is arranged between the first support rod and the second support rod, so that the first support rod and the second support rod are locked in a folded state or an unfolded state; the adjusting device is a telescope, the protruding end of the telescope is pivotally connected to the lower end of the first support rod, and the other end of the telescope is pivotally connected to the central axis; guide wheels are arranged on both sides of the telescope, and the guide wheels are arranged coaxially with the central axis; the first support rod is provided with a guide rail along the length direction, and the guide wheel is rollingly arranged on the guide rail.

2. The folding wheelchair according to claim 1, characterized in that: The front end of the chassis is provided with a front wheel, and the rear end is provided with a rear wheel.

3. The folding wheelchair according to claim 1, characterized in that: The front end of the base frame is provided with a bracket in a sliding and telescopic manner.

4. The folding wheelchair according to claim 3, characterized in that: Foldable wings are provided on both sides of the bracket.

5. The folding wheelchair according to claim 1, characterized in that: The upper end of the third support rod extends upward to form a back support rod.

6. The folding wheelchair according to claim 5, characterized in that: The folding wheelchair further comprises a fourth support rod, the rear end of which is pivotally connected to the upper end of the back support rod.

7. The folding wheelchair according to claim 6, characterized in that: The folding wheelchair further comprises a support assembly, the upper end of the support assembly is pivotally connected to the fourth support rod, and the lower end of the support assembly is pivotally connected to the seat body.

8. The folding wheelchair according to claim 7, characterized in that: The support assembly includes an outer sleeve and an inner shaft, wherein the inner shaft is telescopically sleeved on the outer sleeve, the lower end of the inner shaft is pivotally connected to the seat body, and the upper end of the outer sleeve is pivotally connected to the fourth support rod.

9. The folding wheelchair according to claim 8, characterized in that: The support assembly comprises a locking shaft, and locking holes are arranged on the side walls of the outer sleeve and the inner shaft. The locking shaft can be inserted into or withdrawn from the two locking holes to lock or release the outer sleeve and the inner shaft.

10. The foldable wheelchair according to claim 6, characterized in that: A handrail is slidably provided on the fourth support rod.

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