JP2579374Y2 - Electric wheelchair control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wheelchair control device used by physically handicapped persons and elderly people.

[0002]

2. Description of the Related Art An electric wheelchair, in which a steering shaft is erected in front of a seat provided on a vehicle body and operated by operating a steering wheel provided at an upper end of the steering shaft, is used as a means for moving a person who has difficulty walking. I have. Although the maximum running speed of this electric wheelchair is slightly higher than the normal walking speed of a person, there is a danger of falling if turning sharply at the maximum speed. I have. Also, the steered wheels are prevented from turning too much to prevent a sharp turn.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to simplify a mechanism for detecting that a steering shaft has been turned and a structure for preventing the steering shaft from rotating too much.

[0004]

An electric power steering system in which a steering front wheel 11 is provided at the front center of the vehicle body 10, a steering shaft 13 for changing the direction of the front wheel 11 is erected, and a seat 18 is provided at the rear of the vehicle body 10. In a wheelchair, a plate 3 having a sensor operating portion 2 for operating a sensor 1 for detecting a change in the direction of a front wheel 11 is provided at a lower end of a steering shaft 13. The rotation control part 5 which abuts on 4 was formed, and the steering device of the electric wheelchair was constituted.

[0005]

[Effects of the Invention] The person sitting on the seat 18 can control the steering wheel 1
In order to steer the steering shaft 13, the steering shaft 13 is rotated. The sensor operating unit 2 of the plate 3 provided at the lower end of the steering shaft 13
When the steering shaft 13 is further rotated, the rotation restricting portion 5 of the plate 3 contacts a part of the vehicle body frame 4 to prevent further rotation.

[0006] As described above, the plate 3 provided at the lower end of the steering shaft 13 is provided with the sensor operating portion 2 for the sensor 1 and the rotation regulating portion 5 for restricting the steering shaft 13 from turning too much. The structure of the rotation sensing mechanism and the overturn prevention is simple.

[0007]

Next, the schematic structure of an electric wheelchair will be described with reference to FIGS. In the lower part of the vehicle body 10, a single front steering wheel 11 is mounted at the left and right center of the front, and two driving rear wheels 12 are mounted at the rear left and right. On the upper part of the vehicle body 10, a steering shaft 13 directly connected to the front wheel 11 is erected, and an operation box 14 is provided in the center of the upper part, and a handle 15 is provided on the left and right to protrude left and right, and provided on a portion curved inward. By turning the steering shaft 13 with the grip 16, the front wheel 11 is steered by changing its direction.

The operation box 14 is provided with an accelerator lever 30 for changing the traveling speed on the right side, and the accelerator lever 3 is held while holding the grip 16 of the bar handle 15.
The running speed is adjusted by rotating the wheel 0. or,
On the upper surface of the operation box 14, a speed changeover switch 31 for switching the traveling speed between high, middle and low speed, a blinking changeover switch 32 of a direction indicator lamp for instructing a turning direction to the left and right, a buzzer switch 33 for sounding a buzzer, and a battery 19 An indicator 34 is provided to indicate the state of charge and the like.

A steering cylinder 35 is provided between the operation box 14 and the vehicle body 10 so as to wrap the steering shaft 13.
A steering foot cover 36 swelling downward is provided at the lower end, and a headlight 37 is provided on the foot cover 36 toward the front. On the front side of the steering cylinder 35, a basket 38 for storing small items is provided. A support leg 17 is erected in the center of the rear part of the vehicle body 10, and a seat 18 is mounted on the support leg 17.
Is attached so that it can be fixed to the right and left rotation.

A battery 19 and a motor 20 are disposed below the seat 18 from the front, and a traveling control box 21 is provided in a state sandwiched between the two batteries 19. Gear case 23 projecting right and left
Attached to. Further, a charging transformer 24 is mounted on the support leg 17 above the motor 20. The battery 19 is covered with a front cover 25, and the motor 20 and the like are covered with a rear cover 26. A trunk space 28 is provided at the rear end of the rear cover 26 so that the rear lid 29 can be opened and closed.

FIGS. 1 and 2 show a steering shaft 13 rotatably supported at a lower end of a steering shaft 13 through a boss 6 fixed to a vehicle body 10. The fork 7 is fixed. Boss part 6
The plate 3 is fixed to the steering shaft 13 between the lower end of the fork 7 and the fork 7. The plate 3 has a substantially semicircular shape with a recess formed on the front side, the front and side projections are the sensor operating portion 2, and the right and left ends are the rotation regulating portions 5 which abut against the frame 4 supporting the boss cylinder 6. It is.

A sensor mounting plate 8 projects obliquely forward from the lower end of the boss 6, and the sensor 1 is mounted below it. When the steering shaft 13 is turned to the left and right by about 15 ° from the position where the front wheels 11 are directed immediately before, the sensor operating unit 2 hits the sensor 1, and the vehicle is controlled to decelerate when traveling at high speed. Prevents 10 from falling into an unstable position or falling. When the steering shaft 13 is further turned by approximately 50 °, the rotation restricting portion 5 of the plate 3 hits the vehicle body frame 4 and cannot be further turned.

[Brief description of the drawings]

FIG. 1 is a partial sectional plan view.

FIG. 2 is a partial side view.

FIG. 3 is an overall side view.

FIG. 4 is a partial plan view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sensor 2 Sensor operation part 3 Plate 4 Body frame 5 Rotation restriction part 10 Body 11 Front wheel 13 Steering axis 18 Seat

Claims (1)

(57) [Scope of request for utility model registration] 1. A steering front wheel (11) is provided at the front center of a vehicle body (10), and a steering shaft (13) for changing the direction of the front wheel (11) is provided upright. In an electric wheelchair provided with a seat (18), a plate (3) formed with a sensor operating portion (2) for operating a sensor (1) for detecting a change in direction of a front wheel (11) is provided at a lower end of a steering shaft (13). Provide this plate (3)
A steering device for an electric wheelchair, further comprising a rotation restricting portion (5) abutting on a body frame (4) for restricting excessive rotation of the steering shaft (13).