Multi-function control system

• US 4,281,734 A
• Filed: 10/29/1979
• Issued: 08/04/1981
• Est. Priority Date: 10/29/1979
• Status: Expired due to Term

• Current Assignee: Gary D. Johnston
• Original Assignee: Gary D. Johnston
• Inventors: Johnston, Gary D.
• Primary Examiner(s): Peters, Jr., Joseph F.
• Assistant Examiner(s): McGiehan, Donn
• Application Number:
  US06/089,194
• Time in Patent Office: 645 Days
• Field of Search: 180/6.5, 180/167, 180/DIG. 3, 318/16, 318/587, 250/201, 250/215, 250/221, 280/242 WC
• US Class Current: 180/167
• CPC Class Codes: A61F 4/00 Methods or devices enabling patients or disabled persons to operate an apparatus or a device not forming part of the body operating or control means for prostheses A61F2/48, A61F2/68
• CPC Class Codes: A61G 2203/18 by patient's head, eyes, facial muscles or voice
• CPC Class Codes: A61G 5/045 Rear wheel drive
• CPC Class Codes: A61G 5/1054 Large wheels, e.g. higher than the seat portion
• CPC Class Codes: Y10S 180/907 Motorized wheelchairs

Abstract

A multi-function control system for generating control signals in response to the movement of an operator'"'"'s body is disclosed.

An arrangement of the multi-function control system for controlling the speed and direction of a wheelchair (12) includes a mirror (16) for mounting on the head of the operator, a housing (20) attached to the wheelchair, a light source (26) within the housing for shining on the mirror, light sensors (30, 32, 34, and 36) for sensing the light reflected by the mirror, and a control circuit (38) for driving the wheelchair motors (70 and 72) in response to the output signals of the light sensors. The housing forms an opening facing toward the mirror when the operator'"'"'s head is in the normal forward position.

The control circuit includes an input (39) that responds to the output signals of the light sensors, a signal processing circuit (43), and an output (53) which responds to the signal processing circuit.

The multi-function control system allows the operator to control the speed and direction of the wheelchair using only slight head movements without bulky equipment being connected to the operator and without electrical connections between apparatus carried on the operator'"'"'s body and the wheelchair.

Claims

1. An apparatus for controlling the direction and speed of a vehicle in response to head movements of an operator, comprising in combination;

a mirror for mounting on the head of the operator;

a housing;

means for atttaching the housing to the vehicle, the housing forming an opening facing toward the mirror when the head of the operator is in the normal forward position;

a light source within the housing for shining substantially perpendicular to the mirror when the head of the operator is in the normal forward position;

means within the housing for sensing the light reflected by the mirror, for responding to the different components of movement of the mirror, and providing command signals operatively related to the particular directional components of movement of the mirror; and

a control circuit including an input responsive to the output signals of the light sensing means, means responsive to the input for processing signals, and an output responsive to the means for processing signals;

wherein the control circuit output signals provide the signals for controlling the direction and speed of the vehicle.

2. An apparatus according to claim 1 wherein the means for sensing the light reflected by the mirror comprises, in combination:

two turn control light sensors, one sensor spaced apart from the light source to the operator'"'"'s right and the other sensor spaced apart from the light source to the operator'"'"'s left; and

first and second direction control light sensors, one direction control light sensor spaced apart from the light source in the direction of forward rotation of the operator'"'"'s head and the other direction control light sensor spaced apart from the light source in the direction of backward rotation of the operator'"'"'s head; and

wherein the apparatus further comprises, in combination;

a motor for driving the right side of the vehicle, having a forward drive responsive through the control circuit to the left turn control light sensor and the first direction control light sensor and a reverse drive responsive through the control circuit to the right turn control light sensor and the second direction control light sensor; and

a motor for driving the left side of the vehicle, having a forward drive responsive through the control circuit to the right turn control light sensor and the first direction control light sensor and a reverse drive responsive through the control circuit to the left turn control light sensor and the second direction control light sensor.