JPH08215251A - Electric wheelchair - Google Patents

Abstract

PURPOSE: To facilitate mounting or alighting by turning an arm-rest attached on both left and right sides of a chair upward or downward to retract the chair at a proper interval or turn it sideways from frontward in an electric wheelchair with a handle rod for operation erected in front of the chair. CONSTITUTION: In an electric wheelchair, a chair is erected on a wheel base including a running device comprising a front wheel and a rear wheel for driving and an operation handle rod for steering the front wheel is erected at the front center of the chair. When the running of the wheel base is stopped, one of armrests attached on both sides of the chair is turned upward and when an armrest switch 10 is turned ON, it is judged whether a motor 21 for driving wheels rotates or not. When it does not, a drive motor 34 of an electric cylinder is driven to retract the chair. Thus, the handle rod is separated from the chair to facilitate mounting or alighting. Thereafter, when the switch 10 is turned OFF, the chair is returned to the original position with the driving of the drive motor 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wheelchair used by an elderly person or a physically handicapped person and the like, and makes it possible to easily get on and off a chair on a chassis.

[0002]

2. Description of the Related Art As an electric wheelchair, for example, the actual Kaihei 5-76
The structure described in Japanese Patent No. 424 has been widely used. In this electric wheelchair, a chair is erected on a chassis equipped with a three-wheel traveling device consisting of one front wheel arranged in the front left and right center and a pair of driving rear wheels provided on the rear left and right sides. A steering handlebar for steering the front wheels is erected from the chassis in the center of the front side so that a passenger sitting on a chair can drive at a speed (maximum 6 km / h) that a person can walk while operating the steering handlebar. ing.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Since the steering wheel rod is erected on the front side of the chair, it may be difficult for the elderly and the physically handicapped to get on and off. Therefore, it is an object of the present invention to make it easy to sit in or dismount from a chair in such an electric wheelchair.

[0004]

According to the present invention, in an electric wheelchair in which a steering handle rod 3 is erected in front of a chair 2 erected on a chassis 1, the left and right sides of the chair 2 are stopped when traveling of the chassis 1 is stopped. By rotating one or both of the armrests 4 and 4 provided upward or downward, the chair 2 is retracted by an appropriate distance, or the chair 2 is returned to the original state by rotating the armrest 4 horizontally from the front side. I tried to return it to the position.

[0005]

When the electric wheelchair having the above-mentioned structure is mounted, one or both of the armrests 4, 4 are rotated upward or downward. Then, the chair 2 moves rearward to widen the space between the chair 2 and the handle bar 3, or the chair 2 pivots from the front side to the side so that there is no obstacle in front of the chair and the armrest 4 It becomes easier to get on and off from the side where the was turned. When the armrest 4 is brought into a horizontal state after riding on the chair 2, the chair 2 returns to the normal position and the traveling operation becomes possible.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a side view of an electric wheelchair embodying the present invention, which is similar in appearance to a conventional electric wheelchair and is characterized by an armrest sensor 10 that senses the armrest 4 when it is rotated upward. Is provided, and the support portion 11 of the chair 2 is supported by the guide rail 12 so as to be slidable forward and backward, and the support portion 11 is supported by the electric cylinder 13.
Is to hold the position. The chassis 1 is provided with one front wheel 14 and a pair of left and right rear wheels 15 as in the conventional structure. There is. This operation head 1
6, a power switch 17, an accelerator lever 18, a speed change switch 19 and the like are provided, and a rear wheel drive motor 21, a battery 22, an arithmetic and control unit 23 and the like are provided inside a cover 20 at the rear of the chassis 1. The armrests 4, 4 provided on the left and right side portions of the chair 2 are rotatable from the horizontal to the upper side, and the armrest sensor 10 is turned on when the armrests 4 are rotated upward.

The control block diagram shown in FIG. 1 is for explaining the input and output of signals to and from the arithmetic and control unit 23. First, for the input of signals, an ON / OFF signal is input from the power switch 17, and the accelerator lever 18 is input. The amount of voltage change by the potentiometer is input from, the high / medium / low speed traveling set speed is input from the speed change switch 19, and the armrest switch 10
ON / OFF signal is input from the wheel drive motor 21
The rotation speed of the motor 21 is input from the encoder 24 attached to the
Is input via the battery voltage detection circuit 26.
The signal output from the arithmetic and control unit 23 is the main relay 27.
ON / OFF signal is output to the forward / reverse switching circuit 28, a forward / reverse rotation direction signal of the motor 21 is output to the forward / reverse switching circuit 28, a braking / deceleration signal of the motor 21 is output to the motor braking circuit 29, and the motor 21 is output to the motor drive circuit 30. The acceleration signal is output and the motor 2
An ON / OFF signal is output to the electromagnetic brake 31 attached to No. 1 via the electromagnetic brake drive circuit 32. Further, the motor 34 that drives the electric cylinder 13 that tilts the chair 2 back and forth is controlled via the electric cylinder drive circuit 33 by a signal output from the arithmetic and control unit 23.

FIG. 2 is a control flowchart of the electric cylinder 13. When the armrest 4 is turned upward and the armrest switch 10 is turned on, the wheel drive motor 21 is turned on.
Is rotating, that is, whether it is running or stopped, and if it is not driving, the drive motor 34 of the electric cylinder 13 is driven to move the chair backward. In this state, the handle bar 3 and the chair 2 are separated from each other, which facilitates getting on and off the chair 2. After that, when the armrest 4 is turned downward and the armrest switch 10 is turned off, the drive motor 34 is driven again to return the chair 2 to the original position. In the present embodiment, the chair 2 is retracted by rotating the armrest 4 upward, but the signal may be taken out by rotating the armrest 4 downward. When the armrest 4 is rotated upward by rotating 90 °, the chair 2 may be rotated laterally.

[Brief description of drawings]

FIG. 1 is a block diagram of control.

FIG. 2 is a partial flowchart of control.

FIG. 3 is an overall side view.

[Explanation of symbols]

 1 chassis 2 chair 3 handle rod 4 armrest

Claims (1)

[Claims] 1. In an electric wheelchair in which a steering handle rod (3) is erected in front of a chair (2) erected on the chassis (1), left and right of the chair (2) when the traveling of the chassis (1) is stopped. By rotating one or both of the armrests (4), (4) provided on both sides upward or downward, the chair (2) is retracted by a proper distance, or the chairrest (2) is rotated laterally from the front to move the armrest (4). An electric wheelchair characterized in that the chair (2) is returned to its original position by returning it horizontally.