JP2001204768A - Wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitte the attachment/detachment of a footrest 5 whenever the seat part 1a of a seat 1 in a wheelchair is elevated/lowered and also to relieve the burden to the leg of a user by permitting his or her legs to be naturally stretched when the seat part 1a of the seat 1 is lowered. SOLUTION: A mechanism for elevating/lowering the seat part 1a is arranged between a seat frame 1d for supporting the seat part 1a of the seat 1 and a wheel frame 4 for supporting wheels, and the footrest 5 is disposed in the front and lower part of the seat part 1a in the wheelchair. The wheelchair is provided with a linkage means between the footrest 5 and the elevating/lowering mechanism of the seat part 1a, which is operated by linking to the elevating/lowering operation of the seat part 1a to permit the footrest 5 to be nearly vertical when the seat part 1a is elevated and to be nearly horizontal by raising when the seat part 1a is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a wheelchair,
The present invention relates to a wheelchair having a vertically movable seat.

[0002]

2. Description of the Related Art A person sitting in a wheelchair and a person not sitting in a wheelchair have different eyes.

[0003] For example, when a person who is not sitting in a wheelchair stands, a person sitting in a wheelchair has a lower line of sight. Conversely, a person who is not sitting in a wheelchair directly touches the floor in a living room or the like. In the case of sitting, the gaze of a person sitting in a wheelchair is higher.

Therefore, when a person sitting in a wheelchair is in a living room or the like, a person not sitting in a wheelchair
It is difficult to talk with your eyes.

[0005] In addition, a television or the like cannot be seen with the same line of sight.

[0006] For this reason, conventionally, there has been a device in which a seat portion of a wheelchair seat can be moved up and down so that the seat portion can be lowered when in a living room or the like.

[0007]

By the way, in a wheelchair, a footrest for placing a foot is provided below a front end of a seat so as to hang substantially perpendicularly to a seat portion.

Therefore, as described above, in the case of a wheelchair in which the seat can be raised and lowered, it is necessary to remove the seat so as not to obstruct the footrest when lowering the seat. There was a problem that selfishness was bad.

Also, if the user sits in a wheelchair with the seat portion raised, the feet hang down almost perpendicularly to the seat portion. Is a person who does not have freedom of feet, and the descent of the seat may put an excessive burden on the feet and waist, and thus requires assistance such as stretching the legs.

Therefore, according to the present invention, there is no need to attach or remove the footrest each time the seat is lifted and lowered, and when the seat is lowered, the user's foot can be lifted. It is intended to extend naturally and not to burden the user's feet.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a seat lift mechanism between a seat frame for supporting a seat of a seat and a wheel frame for supporting wheels. In a wheelchair provided with a footrest in front of and below the seat, in conjunction with the raising and lowering operation of the seat, when the seat is raised, the footrest is made almost vertical, and when the seat is lowered, the footrest is raised almost horizontally, An interlocking means is provided between the footrest and the lifting mechanism of the seat.

By the interlocking means between the footrest and the seat elevating mechanism, when the seat is lowered, the footrest is lifted substantially horizontally, and when the seat is raised, the footrest hangs almost vertically. Therefore, there is no need to attach or remove the footrest each time the seat is raised and lowered, and when the seat is lowered, the user's feet naturally extend, No burden on your feet.

[0013]

1 to 5 show an embodiment of a wheelchair according to the present invention.

The seat 1a of the seat 1 of the wheelchair according to the present invention.
Is provided so as to be able to move up and down with respect to a wheel frame 4 on which the rear wheel 2 and the front wheel 3 are attached, by means of four telescopic pantograph link members.

The pantograph link member for supporting the seat 1a of the seat 1 so as to be able to move up and down is composed of a pair of left and right rear leg pantographs 11 and a pair of left and right front leg pantographs 21.

The rear leg pantograph 11 has four links 1
1a, 11b, 11c, and 11d, and the four links 11a, 11b, 11c, and 11d have four pins 1
2a, 12b, 12c, and 12d are rotatably connected to each other to form a parallelogram link.

The four links 11a, 11b, 11c, 1
1d, the lower links 11c and 11d extend below the lower pin 12b. The tip of the link 11c is rotatably connected to a base frame 4a supporting the rear wheel 2 of the wheel frame 4 by a pin 12e. On the other hand, the tip of the link 11d is connected to a slide frame 4b supporting the front wheel 3 of the wheel frame 4 by a pin 12f.
Are connected so as to be rotatable.

The pin 12a at the upper end of the rear leg pantograph 11 is connected to a seat frame 1d for supporting the seat 1a of the seat 1.
Is connected from the back.

The front leg pantograph 21 has four links 2
1a, 21b, 21c, and 21d, and the four links 21a, 21b, 21c, and 21d have four pins 2
2a, 22b, 22c, and 22d are rotatably connected to each other so as to form a parallelogram link.

The four links 21a, 21b, 21c, 2
Of 1d, lower links 21c and 21d extend below lower end pin 22b. The tip of the link 21c is rotatably connected to a base frame 4a supporting the rear wheel 2 of the wheel frame 4 by a pin 22e. On the other hand, the tip of the link 21d is attached to a slide frame 4b supporting the front wheel 3 of the wheel frame 4 by a pin 22f.
Are connected so as to be rotatable.

The pin 22a at the upper end of the front leg pantograph 21 is connected to a seat frame 1d for supporting the seat 1a of the seat 1.
Is connected to the front.

The rear leg pantograph 11 and the front leg pantograph 21 are linked to each other so as to interlock with each other.
1 link 11a and link 21 of front leg pantograph 21
a are connected by a leg side connection link 13.

The wheel frame 4 includes a base frame 4a for supporting the rear wheel 2 and a slide frame 4b for supporting the front wheel 3, and the slide frame 4 for supporting the front wheel 3.
b is configured to be slidable with respect to the base frame 4a, the rear leg pantograph 11 and the front leg pantograph 21 are folded up and down, and a link 1 of the rear leg pantograph 11 is formed.
The distance between the lower ends of 1c and 11d, and the front leg pantograph 21
When the distance between the links 21c and 21d increases, the distance between the rear wheel 2 and the front wheel 3 increases as the distance between the links 21c and 21d increases. Thereby, the interval between the rear wheel 2 and the front wheel 3 becomes narrower in a state where the rear leg pantograph 11 and the front leg pantograph 21 are extended, that is, as shown in FIG. The rotation and running of the wheelchair are not hindered. Conversely, when the rear leg pantograph 11 and the front leg pantograph 21 are folded up and down, and as shown in FIGS. 3 and 4, when the seat portion 1a of the seat 1 is lowered, the footrest 5 is raised in conjunction therewith. The distance between the rear wheel 2 and the front wheel 3 is widened and stabilized.

The left and right base frames 4a of the wheel frame 4 are connected to each other by a bottom frame 4c.

Between the left and right leg side linking links 13 for connecting the rear leg pantograph 11 and the front leg pantograph 21 to each other, a leg left and right linking link 14 is horizontally arranged so as to face the bottom frame 4c. Has been passed over.

An elevating drive pantograph 31 for extending and retracting the rear leg pantograph 11 and the front leg pantograph 21 between the bottom frame 4c and the leg left / right connecting link 14.
Is installed.

This elevating drive pantograph 31 is composed of four links 31a, 31b, 31c and 31d. The four links 31a, 31b, 31c, 31d form a parallelogram link, and the four links 31a, 31b,
Upper links 31a and 31b of 31c and 31d
Is connected to the left and right link 14 by a pin 32a, and the lower links 31c and 31d are connected to the bottom frame 4c by pins 32b. Also, four links 31a, 31b, 31c, 31
The link 31a and the link 31d are pins 32c.
The link 31b and the link 31c are rotatably connected to each other by a pin 32d.

Of the links 31a, 31b, 31c, 31d constituting the lifting drive pantograph 31, the lower link 31c and the link 31d are further fixed to the distal end of a telescopic rod 42a of a hydraulic cylinder 42 installed on the bottom frame 4c. Head link 43 and two links 44
a and 44b constitute a parallelogram link.

The telescopic rod 42a of the hydraulic cylinder 42
, The elevating drive pantograph 31 expands and contracts in conjunction with each other, and the elevating drive pantograph 31 expands and contracts, so that the rear leg pantograph 11 and the front leg pantograph 21 expand and contract.

The bottom frame 4c has a hydraulic cylinder 4
Hydraulic supply pedal 45 for extending and retracting the second telescopic rod 42a
When the hydraulic discharge pedal 46 is attached and the hydraulic supply pedal 45 is depressed, the hydraulic pump 47
When the hydraulic pressure is supplied to the hydraulic cylinder 42, the telescopic rod 42a is extended, and the hydraulic discharge pedal 46 is released.

At the front end of a seat frame 1d supporting the seat 1a of the seat 1, a footrest 5 is swingably mounted.

The footrest 5 includes a footrest frame 5a whose upper end is rotatably connected to a front end of the seat frame 1d by a pin 5d,
a of the foot rest 5b attached to the lower end of a.

A bracket 5e is fixed to the back surface of the footrest frame 5a near the upper end.
The bracket 5e of the footrest frame 5a and the front pin 21d of the front leg pantograph 21 are rotatably connected to each other by the interlocking link 6, so that the front leg pantograph 21 contracts flatly, and the front pin 21d of the front leg pantograph 21 is moved. As it is pushed forward, the footrest frame 5a rises via the bracket 5e. Conversely, as the front leg pantograph 21 is extended and the front pin 21d of the front leg pantograph 21 is pulled backward, the footrest frame 5a is pulled up. 5a descends.

The footrest frame 5a
Is a state in which the front leg pantograph 21 is in the most extended state, that is,
As shown in FIGS. 1 and 2, in a state where the seat 1 a of the seat 1 is at the highest height position, the seat 1 a hangs down substantially perpendicularly, and the front leg pantograph 21 is in the most contracted state. That is, as shown in FIGS. 3 and 4, the seat 1a of the seat 1 is substantially horizontal with respect to the seat 1a in a state where the seat 1a is at the lowest height position.

A foot belt 5c is mounted in the middle of the footrest frame 5a.

The seat 1 includes a seat 1a and a backrest 1b, and a headrest 1c is provided at an upper end of the backrest 1b. The backrest portion 1b is, with respect to the seat portion 1a,
It is provided so that it can recline, and beside the seat 1a,
A reclining lever 71 is provided. An air cylinder 7 is provided between the back of the backrest 1b and the seat 1a.
A reclining device including a backrest 2 and a backrest connecting link 73 is provided. The backrest connecting link 73 is a seat 1
The seat 73a is rotatably connected to the rear end of the seat frame 1d by a pin 73a. The tip of the rod of the air cylinder 72 is
The upper end of the air cylinder 72 is rotatably connected by a pin 72b to a bracket 74 fixed to the upper end of the backrest 1b. , Backrest part 1
As shown in FIGS. 1 and 2, b stands substantially perpendicular to the seat 1a. By operating the reclining lever 71, the air in the air cylinder 72 is released, the air cylinder 72 contracts, and as shown in FIG. 5, the backrest portion 1b can be tilted backward. When the seat 1a is lowered, the footrest 5 is raised, and the backrest 1b is lowered, as shown in FIG.
The seat 1a, the backrest 1b, and the footrest 5 can be in a state like a substantially flat cot.

An armrest 81 is provided at the middle of both sides of the backrest 1b.

Further, on the back of both sides of the backrest portion 1b,
A push handle 61 for an assistance vehicle is installed, and a brake lever 51 is installed on the push handle 61. When the brake lever 51 is gripped, the brake pad 51 hits the rear wheel 2 to apply a brake. .
Further, the brake pad 51 can be applied by operating a side brake 52 installed on the wheel frame 4.

In the wheelchair according to the present invention, as shown in FIG. 1, when the seat 1a of the seat 1 is raised, the footrest 5 hangs down substantially at right angles to the seat 1a. When the seat 1b is lowered, the footrest 5 is raised in conjunction with the lowering of the seat 1b, as shown in FIG.

[0040]

As described above, in the wheelchair according to the present invention, the footrest is lifted substantially horizontally in conjunction with the lowering of the seat portion of the seat, and when the seat portion of the seat is raised, the footrest is substantially vertically suspended. Therefore, there is no need to attach or remove the footrest each time the seat is raised or lowered, and when the seat is lowered, the user's feet naturally extend and This has the effect that no burden is placed on the feet of the person.

[Brief description of the drawings]

FIG. 1 is a perspective view of a wheelchair according to the present invention showing a state where a seat is raised.

FIG. 2 is a side view of the center longitudinal section of FIG. 1;

FIG. 3 is a central longitudinal side view of a wheelchair according to the present invention showing a state where a seat is lowered.

FIG. 4 is a side view of the wheelchair according to the present invention, showing a state in which the backrest is lowered from the state shown in FIG. 3;

FIG. 5 is a perspective view showing a lifting drive unit.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 seat 1a seat portion 1b backrest portion 1c headrest 1d seat frame 2 rear wheel 3 front wheel 4 wheel frame 4a base frame 4b slide frame 4c bottom frame 5 footrest 5a footrest frame 5b footrest 5c foot belt 11 rear leg pantograph 11a11b , 11c, 11d Link 12a, 12b, 12c, 12d, 12e, 12f Pin 13 Leg side connection link 14 Leg left and right connection link 21 Front leg pantograph 21a, 21b, 21c, 21d Link 22a, 22b, 22c, 22d, 22e, 22f Pin 31 Elevation drive pantograph 31a, 31b, 31c, 31d Link 32a, 32b, 32c, 32d Pin 42 Hydraulic cylinder 43 Head 44 Drive connection link 45 Hydraulic supply pedal 46 Hydraulic discharge pedal 5 Brake lever 52 side brake lever 53 the brake pads 61 handle 71 the reclining lever 72 an air cylinder 72a, 72b pin 73 back rest connecting link 74 bracket 81 Armrest

Claims (3)

[Claims] 1. A wheelchair provided with a mechanism for raising and lowering a seat between a seat frame supporting a seat of a seat and a wheel frame supporting wheels, the wheelchair moves to a raised position in conjunction with a lifting operation of the seat. A wheelchair characterized in that a footrest is provided at a front end of a seat portion, wherein the footrest is suspended substantially vertically in a certain state and is lifted substantially horizontally in a lowered position. 2. The seat elevation mechanism is a pantograph-shaped parallelogram link. The link of the parallelogram link and the frame of the footrest are connected by an interlocking link, and the footrest is moved up and down when the seat is elevated. The wheelchair according to claim 1, which is linked. 3. A base frame for supporting a rear wheel and a slide frame for supporting a front wheel are slidably formed, and a lower end of a pantograph-shaped parallelogram link constituting a lifting mechanism of a seat portion is defined as a base frame. The wheelchair according to claim 1 or 2, wherein the wheelchair is connected to a slide frame, and the distance between the rear wheel and the front wheel is made variable in conjunction with the raising / lowering operation of the seat.