JP2992806B2 - Portable wheelchair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable wheelchair which can be folded into a small size.

[0002]

2. Description of the Related Art Conventionally, a wheelchair pushed by a caregiver is
For example, a front wheel and a small-diameter rear wheel capable of freely turning around a vertical axis are provided, and when not in use, the front wheel and the rear wheel are folded close to each other.

FIG. 9 is a side view showing an example of such a wheelchair. The wheelchair 100 includes a seat frame 101
And a pair of arm pipes 102 are disposed in parallel above the seat frame 101. The rear end of the seat frame 101 and the rear end of the pair of arm pipes 102 are pivotally attached to the back frame 103, respectively.
The front end of the pair 1 and the front ends of the pair of arm pipes 102 are each pivotally attached to a front frame 106 to which a pair of front wheels 105 are attached. At the lower end of the front frame 106, a pair of pipes projecting forward in parallel is used as an axis.
Each of the footrests 107 is provided so as to be rotatable upward.

Further, a rear frame 109 to which a pair of rear wheels 108 is attached is pivotally mounted in the middle of the arm pipe 102, and a seat support pin 110 is provided in the middle of the rear frame 109, and a seat frame is provided. 101 is formed to support the lower surface. The seat support pins 110 are configured to engage with a lock mechanism 111 provided at the rear end of the seat frame 101 to fix the space between the seat frame 101 and the rear frame 109.

The seat frame 101 and the arm pipe 1
02, the back frame 103 and the front frame 106
A 4-bar link mechanism is formed and used (see Fig. 9)
, The lock mechanism 111 is released to release the seat frame 1
01 is rotated upward, the four-link mechanism is shifted to a flat parallelogram, and the front frame 106 is moved closer to the rear frame 109 to perform the folding operation (FIG. 10 shows the folding operation). Wheelchair 100 is shown).

[0006]

However, in such a conventional wheelchair, the wheelchair 100 is in a folded state.
Has a height (h2) of the rear frame 109 and the arm pipe 102 extending in a row. This height (h
2) is almost the same as the height (h1) of the wheelchair 100 in use, and when folded, the front wheel and the rear wheel are close to each other and are small in the front-rear direction but not small in the height direction. ,
It was difficult to store and transport the wheelchair itself.

[0007] The present invention has been made in view of the above, and an object of the present invention is to provide a portable wheelchair that can be folded in a very small size by being reduced in the front-rear direction and the up-down direction.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and a portable wheelchair according to the present invention has a pair of front wheels and a rear wheel which can be folded close to each other. And a rear frame having a pair of rear wheels, and a pair of left and right pivots provided at the upper end of the rear frame at a pivot shaft portion and rotatably provided about the pivot shaft portion. A rotating substrate, a back frame having a lower end fixed to the pair of rotating substrates, and a folded position substantially parallel to the back frame and a use position pivotally attached to the back frame and extending forward. A movable armrest,
A seat frame having a rear end pivotally attached to the pair of pivot substrates; a front frame having a pair of front wheels and an upper end pivotally attached to the pair of pivot substrates; and one end being the rear portion. A connecting bar pivotally connected to a frame and the other end pivotally connected to the front frame; a support bar having one end pivotally connected to the seat frame and the other end pivotally connected to the front frame; A portable wheelchair, comprising: a lock mechanism attached to a substrate and engaged with the rear frame so as to fix its use position.

The back frame includes a pair of handles rotatable through a handle mounting base having an engagement groove, and a ridge provided on the handle engages with the engagement groove so that the back position can be used. Is desirably formed so as to be able to hold.

It is desirable that the armrest is formed such that the projection of the horizontal plane is substantially U-shaped, and that the armrest is pivotally attached to the back frame so that the left and right arm rests can be integrally rotated.

[0011]

The present invention is constructed as described above. In use, when the back frame is tilted forward, the turning board turns about the turning shaft.

By the rotation of the rotary board, the upper end of the front frame moves upward and rearward, and the rear end of the seat frame moves upward and forward. As the front frame moves, the connecting bar pulls the rear end of the rear frame forward, the support bar pulls the front end of the seat frame downward, and both frames approach the front frame, respectively.

[0013] By further tilting the back frame forward, the back frame is substantially inverted and overlaps the seat frame, the upper end of the front frame moves to the highest position, and the back frame, the seat frame, the front frame, and the rear frame. The frame is
They lie substantially parallel and form a folded state.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

A portable wheelchair indicated by reference numeral 1 in FIG.
A rear frame 10 having a pair of rear wheels 13, a pair of pivot boards 20 having upper ends of the rear frame 10 pivotally attached to a pivot shaft 21, and a lower end fixed to the pair of pivot boards 20. A back frame 30, an armrest 45 pivotally attached to the back frame 30, a seat frame 47 having a rear end pivotally attached to the pair of pivot boards 20, and a pair of pivot boards 20 including a pair of front wheels 54; A connecting frame 56 having one end pivotally attached to the rear frame 10 and the other end pivotally attached to the front frame 50;
A support bar 60 pivotally attached to the front frame 50 at the other end, and a lock mechanism 65 attached to the rotating board 20.
The back frame 30 includes a pair of handles 38.

The rear frame 10 is formed in a U-shaped frame shape by a pair of rear pipes (not shown in the figure) and a horizontal support 12 which are disposed to face each other. Rear frame 1
A pair of relatively small-diameter rear wheels 13 are attached to the lower end of the rear frame 10, and the upper end of the rear frame 10 is pivotally connected to a pivot shaft 21 of a pivot board 20 by a shaft 15. Note that reference numeral 1
Reference numeral 4 denotes a brake for controlling the rotation of the rear wheel 13.

In the embodiment, the rotary substrate 20 is made of a deformed polygonal metal plate which is long in the vertical direction as shown in FIG.
A rotation shaft 21 for pivotally connecting the upper end of the rear frame 10 is formed at a predetermined position.

A stopper 23 for defining a use position of the rear frame 10 is provided on the rotation board 20 slightly below the rotation shaft 21 and behind the rotation shaft 21. 5
A fixing portion 24 is formed on the upper right hand side of the rotating shaft 21), and a pivot portion 25 is provided below the rotating shaft portion 21. A rear end of the seat frame 47 is pivotally mounted on the rear end of the pivot shaft 21 by a shaft 48, and a lock mechanism 65 is provided between the stopper 23 and the pivot hole 25. I have. A pair of rotating substrates 20 are provided symmetrically oppositely and integrally by a horizontal support 27.

The back frame 30 is formed in a substantially U-shaped frame shape by a pair of back pipes and a horizontal ridge 33 provided to face each other. A lower end portion of the back frame 30 is fixed to the fixing portion 24 of the rotating board 20, and a pair of handles 40 is attached to an upper end portion via a pair of handle mounts 34. At a predetermined position of the back frame 30, a stopper 32 that defines a use position of the armrest 44 is protruded.

As shown in FIG. 6, the handle mounting base 34 is provided at the upper end of the back frame 30 so as to protrude rearward, has an engagement groove 35 extending substantially vertically inside thereof, and has an axial line extending in the left-right direction. Is provided.

The handle 38 is formed of a cylindrical member. A ridge 40 is formed inside the base 39 so as to fit into the engagement groove 35, and a female screw 41 having an axis in the left-right direction is threaded. I have. The handle 38 engages the ridge 40 with the engagement groove 3.
5, the fixing screw 42 is passed through the through hole 36, and the fixing screw 42 is fastened to the female screw 41 and fixed to the back frame 30.

The armrest 44 is formed in a substantially U-shape in plan view, and has an arm rest 45 at opposite ends, and is pivotally attached to the back frame 30 by shafts 46, 46. And the armrest 45 is the stopper 3
2, a use position in which the arm rest 45 extends forward;
The arm rest 45 is formed so as to rotate left and right integrally with a folded position extending substantially parallel to the back frame 30.

The seat frame 47 is formed in a substantially U-shape, and its rear end is pivotally connected to the pair of rotating substrates 20 by a shaft 48. The seat frame 47 and the back frame 3
At 0, a seat 49 formed of a thick cloth material and forming a seat portion and a backrest portion is stretched.

The front frame 50 has a shaft 51 at the upper end, a footrest 52 at the lower end, and a pair of front wheels 55 made of caster wheels.
The front frame 50 has a pair of left and right pivot portions 54 having a horizontal axis in the middle thereof, and both ends of the shaft ridge 51 are pivotally attached to the pivot portions 25 of the rotating substrate 20 facing each other. I have. The foot rest 52 has a plurality of horizontal ridges 5.
3 are attached.

The connecting bar 56 is made of a linear member and has one end pivotally connected to the lower end of the rear frame 10 by a shaft 57.
The other end is pivotally connected by a shaft 58 near the pivot 54 of the front frame 50, and a pair of connecting bars 56 are provided to face left and right.

The support bar 60 has an inverted T having a horizontal shaft 61.
And the both ends of the horizontal shaft 61 are pivotally attached to the pivot 54 of the front frame 50, respectively.
The front end of the character is pivotally attached to the front end of the seat frame 47 by a shaft 62.

In the embodiment, the lock mechanism 65 is formed with a pair of lock pins 66 which are attached to the rotating board 20 and are urged to project to the side. Lock pin 6
6 is formed so as to protrude from the rotating board 20 and fit into a lock hole (not shown) of the rear frame 10 at the use position to lock the use position.
The lock pin 66 is operated by a release handle 67 made of a string or the like to release the engagement with the rear frame 10 to release the lock of the use position.

Next, the folding operation of the portable wheelchair thus configured will be described.

FIG. 1 shows a side view of the portable wheelchair 1 in use, and the seat frame 47 and the armrest 44 are
The back frame 30 is in a substantially upright state, being substantially horizontal and parallel, and the handle 38 is fixed by extending rearward with the ridge 40 engaged with the engagement groove 35.

The rear frame 10 is provided with a stopper 23
And the front frame 50 is locked by the lock mechanism 65, and the lower end of the front frame 50 projects obliquely downward and forward from the rotating board 20. The connecting bar 56 is connected between the rear frame 10 and the front frame 50. Are connected at the open angle in the use state to maintain the use position. At this time, the pivot 54 and the shaft 58 are located forward of a line connecting the shaft 57 and the shaft 62.

The pivot substrate 20 has a longitudinally extending longitudinal direction, the pivot portion 25 is located below the pivot shaft portion 21, and the shaft 48 is slightly above the pivot shaft portion 21 above. positioned.

To make the portable wheelchair 1 in a folded state,
First, the fixing of the handle 38 is loosened by operating the fixing screw 42, the engagement between the ridge 40 and the engagement groove 35 is released, and the handle 38 is brought into the folded position parallel to the back frame 30. In addition, the front end of the armrest 44 is lifted, and the armrest 45 is set to the folding position parallel to the back pipe 31.

Next, the release handle 67 is operated to unlock the use position of the rear frame 10, and the back frame 30 is tilted forward. At this time, the rotating board 20 rotates counterclockwise in FIG.
With this, the pivoting portion 25 (the shaft 5 of the front frame 50)
1) moves to the rear of the rotating shaft 21, and the shaft 48 (the rear end of the seat frame 47) moves diagonally upward and forward of the rotating shaft 21.

Then, the pivoting portions 54 of the front frame 50,
The shaft 58 moves on the line connecting the shaft 57 and the shaft 62 toward the rotating board 20, draws the front end of the seat frame 47 to the front frame 50 via the support bar 60, and The rear end of the rear frame 10 is pulled toward the front frame 50 via 56 (see FIG. 7).

Further, when the back frame 30 is inclined, the back frame 30 is in an inverted state and overlaps the seat frame 47, and the rotating board 20 is rotated.
The pivot 25 moves above the pivot shaft 21, and the shaft 48 moves obliquely downward and forward of the pivot shaft 21. As a result, the pivotal attachment portion 25 of the rotary board 20 is at the highest position, and the inverted back frame 30, the downward seat frame 47, the upright front frame 50, and the upright rear frame 10 are arranged in this order from the front side. The folded state is almost parallel and overlapped (see FIG. 8).

That is, the height H2 of the portable wheelchair 1 in the folded state corresponds to the length of the front frame 50. In the embodiment, the height H2 in the use state is approximately two.
/ 3. As a result, a wheelchair for a user with a height of about 170 cm could be formed within 115 cm in which the sum of the three sides of length, width, and depth could be carried in the aircraft. In the folded state, the shaft 51 or the horizontal member 27 can be used as a carrying hand.

In the folded portable wheelchair 1, the back frame 30 is separated from the seat frame 47, and the back frame 30 is turned substantially upright.
The seat frame 47, the front frame 50, and the rear frame 10 are moved to the use positions in the opposite manner to the above through the zero.
At this time, the use position of the rear frame 10 is locked by the lock mechanism 65, and the connecting bar 56 and the support bar 60 are locked.
Supports the space between the rear frame 10, the seat frame 47, and the front frame 50 in use. Then, the armrest 44 is rotated horizontally, and the handle 38 is fixed in a horizontal state to be in a use state.

[0038]

As described above, the portable wheelchair of the present invention has the above-mentioned structure, and when folded, the height (vertical dimension) of the wheelchair is equal to the length of the front frame. And can be reduced to approximately ／ of the height in use. Therefore, the height of the wheelchair can be reduced along with the reduction in the size in the front-rear direction, and the wheelchair can be folded extremely small.

Further, the front frame, the rear frame, and the seat frame are optionally folded through the rotating board by the rotating operation of the back frame, so that the folding operation can be performed with one hand. With the downsizing in the height direction, storage and transportation are facilitated, and handling is extremely easy.

[Brief description of the drawings]

FIG. 1 is a side view of a portable wheelchair according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a rear view of the same.

FIG. 5 is a side view of the rotating board.

FIG. 6 is a perspective view of a handle.

FIG. 7 is a side view showing the progress of folding.

FIG. 8 is a side view of the portable wheelchair in a folded state.

FIG. 9 is a side view showing an example of a conventional wheelchair.

FIG. 10 is a side view showing the folded state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Portable wheelchair 10 Rear frame 13 Rear wheel 20 Rotating board 21 Rotating shaft part 30 Back frame 34 Handle mounting base 35 Engagement groove 38 Handle 40 Ridge 44 Armrest 47 Seat frame 50 Front frame 55 Front wheel 56 Connection bar 60 Support bar 65 Lock pin

Claims (3)

(57) [Claims] 1. A portable wheelchair in which a pair of front wheels and a rear wheel are close to each other and can be folded, wherein a rear frame having a pair of rear wheels, and an upper end of the rear frame pivotally connected to a rotating shaft. A pair of left and right rotating substrates provided so as to be rotatable about the rotating shaft portion, a back frame having lower ends fixed to the pair of rotating substrates, and a pivotally attached to the back frame. An armrest pivotable between a use position extending forward and a folding position substantially parallel to the back frame; a seat frame having a rear end pivotally attached to the pair of pivot substrates; A front frame having a front wheel and an upper end pivotally connected to the pair of rotating substrates; a connection bar having one end pivotally connected to the rear frame and the other end pivotally connected to the front frame; The other end is pivotally attached to the seat frame and the other end is the front frame. A portable wheelchair, comprising: a support bar pivotally mounted; and a lock mechanism attached to the rotating board and engaged with the rear frame so as to fix the use position thereof. . 2. The portable wheelchair according to claim 1, wherein the back frame includes a pair of handles rotatable via a handle mount having an engagement groove, and a projection provided on the handle. A portable wheelchair, wherein a ridge is formed so as to be engaged with the engagement groove so as to be able to hold a use position. 3. The portable wheelchair according to claim 1, wherein said armrest has a substantially U-shaped projection on a horizontal plane, and is pivotally attached to a back frame so that left and right arm rests are provided. A portable wheelchair, which is provided so as to be integrally rotatable.