TWI555525B - Folding wheelchair - Google Patents

Description

Folding wheelchair

The present invention relates to a mobile assistive device, and more particularly to a folding wheelchair.

There is a folding wheelchair (US Pat. No. 3,758,150), in which a toggle member is pivotally connected between the bottoms of the two side frames, and an upper toggle member is also pivotally connected to the top of the side frame and corresponding to the rear end. In addition, a fabric seat is disposed between the tops of the side frames corresponding to the lower toggle members, and a pair of pivoting links are pivotally connected between the side frames below the fabric seats.

The pulleys are relatively unfolded, and the lower toggle member and the upper toggle member are in a deployed shape, so that the wheelchair can be deployed in a rideable state. When the connecting rods are relatively folded, and the lower toggle member and the upper toggle member are folded into a folded shape, the wheelchair can be folded into a smaller volume state.

Although the wheelchair has a folding function, the number of members providing the folding function is large, and the structure is complicated. When the folding or unfolding is to be performed, the operator separately separates the lower toggle member, the upper toggle member, and the like. The operation of the connecting rod is also cumbersome and not easy to operate.

In addition, another wheelchair (US 6,311,999 patent) is not The utility model has the function of folding, which connects the two inverted L-shaped side frames by using the transverse mandrel tube and the step frame, and forms a high rigidity and simple structure, which proposes a wheelchair with a folding function, and the pivoting point of the folding mechanism is excessive This will affect the rigidity of the support structure, as is the case with the folding wheelchair disclosed in the US Pat. No. 3,758,150.

Accordingly, it is an object of the present invention to provide a folding wheelchair that is simple in construction, easy to operate, and generally rigid.

Thus, the folding wheelchair of the present invention comprises a support unit, a pair of runners, a pair of front guide wheels, a toggle unit and a seat unit. The support unit has a pair of side frames each having a front end, a rear end opposite to the front end, a front axle seat disposed at the front end, and a rear axle seat corresponding to the rear end, the rear axle The seat has a shaft hole disposed along an axis, and the wheels are respectively axially disposed on the side frames, and the front guide wheels are respectively axially disposed on the side frames, and the toggle unit is pivotally connected to the support unit. Between the side frames, and having a pair of pivotally connected elbows and a pin disposed between the elbows, each of the elbows having a front side corresponding to the front ends, one corresponding to the rear a rear side of the end, a side edge portion pivotally connected to the corresponding side frame, a connecting portion opposite to the side edge portion and pivotally connected to the other leg frame, and a connecting portion disposed at the side edge portion and passing through the side edge portion a front pivot of the front axle seat and a rear pivot shaft disposed at the side edge portion and disposed in the corresponding rear axle hole, the pin axle is disposed between the connecting portions, the elbow bracket is The rear sides are gradually inclined downwardly toward the front sides, and the toggle unit can be operated in an unfolded state in which the side edges of the elbows are apart from each other. Such armrest side edge portions approaching each other collapsed state, the The seat unit is detachably mounted on the side frames of the support unit and includes a seat plate having a fixed contour shape, and the toggle unit is unfolded when the seat unit is mounted between the side frames The state is not foldable, and the toggle unit can be folded when the seat unit is detached from the side frames.

The effect of the present invention is that the elbows of the toggle unit are gradually inclined downwardly from the rear sides toward the front sides, so that the operation of the toggle unit in the unfolded state or the folded state is relatively easy and unfolded. It has sufficient support rigidity and simplifies the overall structure.

10‧‧‧Support unit

11‧‧‧Side frame

111‧‧‧ top

112‧‧‧ bottom

113‧‧‧ front end

114‧‧‧ Backend

12‧‧‧ pedal

13‧‧‧ Subject

131‧‧‧Axle hole

132‧‧‧ screw holes

14‧‧‧Main frame

141‧‧‧ Positioning film

142‧‧‧Positioning holes

15‧‧‧cantilever

16‧‧‧ front axle seat

17‧‧‧ rear axle seat

L‧‧‧ axis

171‧‧‧Axis hole

172‧‧‧Limited slot

174‧‧‧First stop

175‧‧‧second stop

20‧‧‧Runner

30‧‧‧ front wheel

40‧‧‧Toggle unit

41‧‧‧Elbow

411‧‧‧ front side

412‧‧‧ Back side

413‧‧‧lateral edge

414‧‧‧Connecting Department

415‧‧‧ front pivot

416‧‧‧ rear pivot

417‧‧‧ §

42‧‧‧ pin

43‧‧‧Sliding surface

44‧‧‧Limited side edges

45‧‧‧Abutment

50‧‧‧Seat unit

51‧‧‧ seat plate

511‧‧‧ latch

513‧‧‧ knob

52‧‧‧ by board

60‧‧‧Handrail unit

61‧‧‧ Positioning board

611‧‧‧ pivot end

612‧‧‧Swing end

613‧‧ ‧ guide slot

614‧‧‧ embedded card slot

62‧‧‧ by board

63‧‧‧Locking parts

631‧‧‧ Fixed Department

632‧‧‧Card Department

633‧‧ ‧ spring

P‧‧‧ water level

Θ‧‧‧ angle

The other features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention, wherein: FIG. 2 is a rear perspective view of a preferred embodiment of the present invention; FIG. 3 is an exploded perspective view of the preferred embodiment of the present invention; FIG. 4 is a side elevational cross-sectional view of the preferred embodiment of the present invention. Figure 5 is a cross-sectional view taken along line VV of Figure 4; Figure 6 is a cross-sectional view taken along line VI-VI of Figure 5; Figure 7 is a partial perspective view of a preferred embodiment of the present invention FIG. 8 is a schematic exploded view of a toggle unit according to the above preferred embodiment of the present invention, illustrating a stopper abutting against a limit retaining edge; FIG. 9 is along the same figure. 4 is a cross-sectional view of the line IX-IX; FIG. 10 is a schematic view showing the preparation of the first preferred embodiment of the present invention; And Figure 11 is a schematic view showing the folding of the above preferred embodiment of the present invention.

Referring to Figures 1, 2 and 3, a preferred embodiment of the folding wheelchair of the present invention comprises a support unit 10, a pair of runners 20, a pair of front guide wheels 30, a toggle unit 40, and a seat unit 50. And an armrest unit 60.

The support unit 10 has a pair of side frames 11 and a pair of pedals 12 pivotally connected to the side frames 11, respectively. The side frames 11 each have a top portion 111, a bottom portion 112 opposite to the top portion 111, a front end 113, and a rear end 114 opposite to the front end 113, a pair of main bodies 13 corresponding to the rear end 114, and a connection thereto. The main frame 13 is substantially an inverted L-shaped main frame 14 , and a cantilever 15 connected to the main body 13 and extending from the main body 13 toward the end of the main frame 14 is disposed at the front end 113 and approaches the same The front axle seat 16 of the bottom portion 112 and a rear axle seat 17 are disposed on the main body 13. The main body 13 has an axle hole 131 and a screw hole 132 disposed on the axle hole 131 and corresponding to the side of the rear end 114. The main frame 14 has a positioning piece 141 and a positioning piece 141 disposed thereon. The U-shaped positioning hole 142 is matched with reference to FIG. 5, FIG. 6 and FIG. 7. The rear axle seat 17 has a shaft hole 171 disposed along an axis L and a limit extending radially outside the shaft hole 171. a slot 172, the axis L is inclined, and gradually extends downwardly from the rear end 114 toward the front end 113. The limiting slot 172 has a first end 174 and a first block around the axis L. The second end 175 of the end 174. The pedals 12 are respectively pivotally connected to the front end 113 of the side frames 11 and approach the bottom portions 112. The pedals 12 are arranged to overlap each other and can be operated in a sway shape (see FIG. 1). Or The upper pivot is turned into an upright shape (see Figure 11).

The reels 20 are respectively disposed at the rear ends 114 of the side frames 11 . In the embodiment, the reels 20 are respectively axially disposed on the axle holes 131 of the main bodies 13 .

The front guide wheels 30 are respectively disposed at the front ends 113 of the side frames 11 and are adjacent to the bottom portions 112. In the embodiment, the front guide wheels 30 are respectively disposed at the ends of the cantilever arms 11.

Referring to FIG. 5, the toggle unit 40 is pivotally connected between the side frames 11 of the support unit 10, and has a pair of pivotally connected elbows 41 and a pin disposed between the elbows 41. Axis 42. The elbows 41 each have a front side 411 corresponding to the front end 113 and approaching the bottom portion 112, a rear side 412 corresponding to the rear end 114 and approaching the top portion 111, and a portion a side edge portion 413 pivotally connected to the corresponding side frame 11 , a connecting portion 414 opposite to the side edge portion 413 and pivotally connected to the other elbow frame 41 , and a side portion 413 disposed on the side edge portion 413 and corresponding to the front end portion a front pivot 415 of 113 and a rear pivot 416 disposed on the side edge portion 413 and passing through the corresponding rear axle hole 171. As shown in FIGS. 1 and 4, the elbows 41 are The rear side 412 is gradually inclined downwardly toward the front side 411. When the toggle unit 40 is in an unfolded state in which the side edge portions 413 of the elbows 41 are apart from each other, the elbows 41 and a horizontal plane P are There is an angle θ between 20 and 70 degrees, and the angle θ is about 30 degrees in this embodiment. The front pivots 415 are disposed in the corresponding front axle brackets 16, and each of the rear pivots 416 has a stop member 417 that can be respectively sleeved in the limiting slots 172. The pin shaft 42 is axially disposed on the Between the connecting portions 414, and as shown in FIG. 8, the connecting portion of one of the elbows 41 The 414 has a sliding surface 43 surrounding the outer portion of the pin 42 and a limiting side edge 44 disposed at one end of the sliding surface 43. The connecting portion 414 of the other bracket 41 has a limiting side edge 44. Abut against the positioned abutment surface 45.

The seat unit 50 is detachably mounted on the side frames 11 of the support unit 10, and includes a seat plate 51 having a fixed contour shape and a back plate extending from the rear side of the seat plate 51 and extending upward. 52. The seat plate 51 has two latches 511 protruding downwardly and having a narrow width and a narrow shape, and two knobs 513 which are close to the backing plate 52 and can lock the seat plate 51 to the support unit 10, the latches The 511 can be inserted into the positioning holes 142 of the side frames 11 , and the knobs 513 can be locked in the screw holes 132 of the side frames 11 . The above-mentioned fixed contour shape means a soft seat having a relatively high hardness and strength, which is different from the conventional fabric type. In the present embodiment, the seat plate 51 and the backing plate 52 are made of a fiber-reinforced composite material.

With reference to FIG. 4 and FIG. 9 , the armrest units 60 are mounted on the support unit 10 , and each has a positioning plate 61 adjustably mounted to the rear end 114 of the side frames 11 , and a connecting plate 61 connected to the positioning plate 61 . The backing plate 62 and a locking member 63 that can fix the positioning plate 61 to the main body 13 are provided. The positioning plates 61 each have a pivoting end portion 611 pivotally connected to the main frame rod 14 , a swinging end portion 612 opposite to the pivoting end portion 611 , and an arc shape around the pivoting end portion 611 . The guide groove 613 has a plurality of insertion grooves 614 which are connected to the guide groove 613 and have a diameter-expanding shape. The locking plates 63 are respectively connected to the top edges of the positioning plates 61. The locking members 63 each have a fixing portion 631 locked to the main body 13 and passing through the guiding grooves 613. a latching portion 632 of the fixing portion 631 and a mounting portion between the fixing portion 631 and the latching portion 632 a spring 633 having a potential energy for allowing the latch portion 632 to be nested in any of the latching slots 614. The latching portion 632 is moved out of the corresponding latching slot 614 to enable the positioning plate. 61 produces a wobble relative to the bodies 13.

Further, as shown in FIG. 1, FIG. 2, FIG. 4 and FIG. 5, the wheelchair of the present invention is shown in a state in which it can be seated, that is, the toggle unit 40 is in the deployed state, and the side frames 11 have The maximum separation distance, at this time, as shown by the solid line in FIG. 6, the first stoppers 174 are respectively positioned by the stoppers 417, and as shown in FIG. 8, the spacers 45 are used to abut. The armrests 41 can be held in a side-by-side, unfolded state on the limit retaining edges 44. The seat unit 50 is mounted between the side frames 11 and the pins 511 of the seat plate 51 are inserted into the positioning holes 142 of the side frames 11. The knobs 513 are also locked to the sides. In the screw hole 132 of the frame 11, the seat plate 51 can provide a user seat. As shown in FIG. 4 and FIG. 9, the latching portion 632 of the locking member 63 of the armrest unit 60 is nested in a card insertion slot 614 at the bottommost end, and the rest plates 62 are suspended on the runners. Above the 20, you can ride on the author's arm.

As shown in FIG. 10, when the wheelchair is temporarily not used, or is to be collected, transported, or packaged, the operator may first unscrew the knobs 513 from the screw holes 132 (refer to FIG. 3), and enable the same. The latch 511 is removed from the positioning holes 142 to detach the seat unit 50 from the support unit 10. Then, the operator only needs to lift the pin 42 of the toggle unit 40 upward, and the shaft pins 42 are pivotally connected to each other by the elbows 41, and the side edge portions 413 of the elbows 41 are used. The pivot 415 is pivotally connected to the front axle seat 16 The rear pivots 416 are pivotally connected to the rear axle seats 17, so that the toggle unit 40 can be operated in a folded state in which the side edge portions 413 of the elbows 41 approach each other. When the toggle unit 40 is in the folded state, as shown by the imaginary line in FIG. 6, the blocking members 417 are respectively positioned on the second end 175, and the elbows 41 are placed upright and utilized. The elbow frame 41 can also interlock the side frames 11 to each other, so that the wheelchair can be folded and the volume of the wheelchair can be reduced (see Figure 11).

As shown in FIG. 11, and in conjunction with FIG. 9, the toggle unit 40 is in a folded state, and when the wheels 20 are detached from the side frame 11 of the support unit 10, the locking members 63 are pulled. The positioning plate 61 is swayed relative to the main body 13 by being removed from the corresponding card slot 614, and the plate 62 is lowered downward until the locking portion 632 of the locking member 63 is nested. At the topmost one of the card slots 614, the height of the folded wheelchair can also be reduced by the adjustment of the height of the panel 62.

Therefore, the efficacy of the wheelchair of the present invention can be further summarized as follows:

1. The elbows 41 of the toggle unit 40 are gradually inclined downwardly from the rear side 412 toward the front side 411, so that when the toggle unit 40 is in the unfolded state, the top 111 can be generated. Extending to the bottoms 112, and supporting by the front ends 113 to the rear ends 114. That is to say, the toggle unit 40 extending in a single inclination can replace a conventionally extending lower toggle section and a vertically extending upper toggle section. The toggle unit 40 has a small number of components, a simple structure, and is easy to manufacture and can reduce the manufacturing cost.

2. The single toggle unit 40 has a minimum pivot The joint, and the seat plate 51 having a fixed contour shape is used to match the toggle unit 40, and the support unit 10 is provided with a relatively rigid rigid structure.

3. The operator only needs to lift the pin 42 of the toggle unit 40 upwards, so that the toggle unit 40 can be folded and interlocked with the side frames 11 to be engaged with each other. The pin 42 is pushed down again, so the folding and unfolding operation is quite simple.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

10‧‧‧Support unit

11‧‧‧Side frame

12‧‧‧ pedal

20‧‧‧Runner

30‧‧‧ front wheel

40‧‧‧Toggle unit

50‧‧‧Seat unit

51‧‧‧ seat plate

52‧‧‧ by board

60‧‧‧Handrail unit

61‧‧‧ Positioning board

62‧‧‧ by board

Claims (8)

A folding wheelchair includes: a supporting unit having a pair of side frames each having a front end, a rear end opposite to the front end, a front axle seat disposed at the front end, and a front axle seat corresponding to the rear end a rear axle seat having a shaft hole disposed along an axis; a pair of runners respectively disposed on the side frames; a pair of front guide wheels respectively disposed on the side frames; a toggle unit Anchored between the side frames of the support unit, and having a pair of pivotally connected elbows and a pin disposed between the elbows, each of the elbows having a corresponding one a front side of the front end, a rear side corresponding to the rear ends, a side edge portion pivotally connected to the corresponding side frame, a connecting portion opposite to the side edge portion and pivotally connected to the other one of the elbow frames, and a setting a front pivot shaft disposed at the side edge portion and passing through the front axle seat; and a rear pivot shaft disposed at the side edge portion and passing through the corresponding rear axle hole, the pin shaft being disposed at the connection Between the portions, the elbows are gradually inclined downwardly from the rear sides toward the front sides, and the toggle units may be provided with a side edge portion of the elbows The remotely unfolded state is operated in a folded state in which the side edges of the elbows approach each other; and a seat unit is detachably mounted on the side frames of the support unit, and includes a a seat plate having a fixed contour shape, when the seat unit is installed between the side frames, the toggle unit is in an unfolded state and cannot be folded, when the seat unit is detached from the side frames, The toggle unit can be folded. The folding wheelchair according to claim 1, wherein the side frames of the support unit each have a pair of main bodies that should be equal to the rear end, a main frame rod connected to the main body, and a cantilever connected to the main body. The equal-rotation wheels are respectively disposed on the main shafts, and the front guide wheels are respectively disposed on the cantilevers. The folding wheelchair according to claim 1, wherein the rear axle seats of the side frames of the support unit further have a limiting slot disposed radially outside the shaft hole, the axis being inclined, and Extending downwardly from the rear end toward the front end, the limiting slot has a first end and a second end spaced around the first end, the rear pivot of the toggle unit Each has a stop member that can be respectively sleeved in the limit slots. When the toggle unit is in the unfolded state, the stops are respectively positioned at the first stop ends, and the toggle unit is in a folded state. The stops are respectively positioned at the second stops. The folding wheelchair according to claim 3, wherein the connecting portion of one of the elbow units has a sliding surface surrounding the outer portion of the pin and a limiting side edge disposed at one end of the sliding surface. The connecting portion of the other elbow has an abutment surface on which the limiting side edge abuts. The folding wheelchair according to claim 2, further comprising a pair of armrest units mounted on the supporting unit, each of the armrest units having a positioning plate adjustably mounted at a rear end of the side frames, and a connecting plate coupled to the positioning plate a supporting plate for fixing the positioning plate to the main body, the positioning plates each having a pivoting end pivotally connected to the main frame bar and a swinging end opposite to the pivoting end portion When the toggle unit is in the unfolded state, the supporting plates are respectively disposed above the rotating wheels, and the toggle unit is in the folded state The locking member is operated and the positioning plates are oscillated relative to the body, the plates being lowered downwardly. The folding wheelchair according to claim 5, wherein the positioning plates of the armrest units further have a guide groove that is arc-shaped around the pivotal end portion, and a plurality of the guide plates that are connected to the guide groove and have an expanded diameter. a locking slot, each of the locking members has a fixing portion that is fixed to the main body and passes through the guiding slots, a set of a clamping portion disposed on the fixing portion, and a mounting portion and the locking portion a spring between the springs having a potential energy that allows the latch portion to be nested in any of the card slots, and the latch portion is moved out of the corresponding card slot to allow the positioning plate to be opposite to the The body is oscillated. The folding wheelchair according to claim 1, wherein when the toggle unit is in the unfolded state, the elbow has an angle between 20 and 70 degrees with a horizontal plane. The folding wheelchair according to claim 1, wherein the supporting unit further has a pair of pedals respectively pivotally connected to the side frames, the pedals being pivotally connected to the front ends of the side frames, the pedals being operable to be flat Swinging, or pivoting upwards into an upright shape.