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 Title: |
US3990319:
Electrical control device for electric motor driven, electrically turnable wheelchairs for invalids and other patients
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Hofer, Bjorn; Jarfalla, Sweden
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| Assignee: |
Landstingens Inkopscentral Lic., Solna, Sweden
other patents from LANDSTINGENS INKOPSCENTRAL (328320) (approx. 17)
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| Published / Filed: |
1976-11-09
/ 1974-07-01
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| Application Number: |
US1974000484565
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| IPC Code: |
Advanced:
A61G 5/04;
H01H 25/06;
IPC-7:
G05G 9/00;
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| ECLA Code: |
A61G5/04; H01H25/06; K61G203/14; Y02T10/72D;
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| U.S. Class: |
Current:
074/471.XY;
Original:
074/471.XY;
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| Field of Search: |
074/523,471 R,471 XY,473,565
180/77 H,77 HT,99,DIG. 3
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| Priority Number: |
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| Abstract: |
An electrical control or operation device for wheelchairs for invalids is provided, the wheelchair being driven and steered electrically. The device comprises two control means, each preferably consisting of two potentiometers, one of the control means controlling the speed forward and backward of the wheelchair, and the other control means controlling the direction of motion of the wheelchair. The two control means may be potentiometers or similar means and can be adjusted individually by one single lever. The body or casing of one of the two control means is fixed to the frame of the control device, and that of the other control means is mechanically connected to the control shaft of the first control means, whereas the control shaft of the second control means is mechanically connected to the lever. At the neutral position of the lever corresponding to zero speed and straight course of the wheelchair, the axes of the lever and of the two said shafts are at substantially right angles each in a different coordinate direction. The device is mounted on the wheelchair such that when moving the lever forward or backward in the longitudinal direction of the chair, the chair will move forward or backward, respectively. Similarly, when moving the lever laterally, the chair will turn into the corresponding direction. The lever may be operated by only two fingers or even by only one finger of the hand, or by the cupped palm thereof.
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| Attorney, Agent or Firm: |
Colvin, Arthur B. ;
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| Primary / Asst. Examiners: |
Scott, Samuel; McKenzie, Jr., Frank H.
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 6 known family members
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First Claim:
Show all 9 claims |
What I claim is:
1. In an electric motor driven and steered wheelchair of the type in which motive power and steering are effected responsive to the selective energization of electric motor means connected to the wheels of said wheelchair, an improved control mechanism comprising a casing secured to said wheelchair, a first voltage varying means fixed to said casing and having a first control shaft rotatable about a first axis of rotation, an operator lever adapted to be grasped by the user mounted to said shaft and adapted to rotate said shaft responsive to movement of said lever in a first plane, a second voltage varying means movably mounted in said casing and having a second control shaft, said second control shaft being connected to said lever and rotatable about a second axis normal to said first axis responsive to movements of said lever in a direction normal to said first plane, one of said voltage varying means being connected to control the propulsion speed of said motor means and the other of said voltage varying means being connected to control the steering function of said motor means.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 3 U.S. patent(s) that reference this one
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