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Contact device for delivering electrical signals corresponding to the position of a movable body

  • US 4,972,052 A
  • Filed: 07/14/1988
  • Issued: 11/20/1990
  • Est. Priority Date: 11/17/1986
  • Status: Expired due to Fees
First Claim
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1. A contact device for delivering electrical signals corresponding to the movement of a movable body, comprising:

  • two layers including a base layer and a flexible layer, said flexible layer being positioned in front of the base layer and spaced from the base layer by a spacing means, one of said two layers being provided with a first elongated electrical conductor and the other of said two layers being provided with a plurality of contact elements which are arranged so that at least a portion of each of said contact elements is positioned in front of a portion of said first conductor;

    a pressure means connected to a movable body and arranged to abut against said flexible layer, thereby pressing said flexible layer toward said base layer and to be moved on said flexible layer when said movable body is moved substantially along a path defined by said first conductor, so that electrical contact is provided between said first conductor and at least one of said contact elements over which said pressure means passes;

    a second elongated electrical conductor which is arranged to be in electrical contact with said at least one contact element when the pressure means passes over said at least one contact element, so that an electrically conducting path is formed between said first conductor and said second conductor through said at least one contact element; and

    a voltage source connected to one of said first and second conductors, whereby an electrical signal is transmitted through the other of said conductors each time said pressure means passes over a contact element and presses said contact element into electrical contact with at least one of said conductors.

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