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Multi-function input device and system

  • US 4,910,503 A
  • Filed: 06/15/1987
  • Issued: 03/20/1990
  • Est. Priority Date: 06/15/1987
  • Status: Expired due to Fees
First Claim
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1. A switch which can indicate an infinite number of positions about a rotary axis for use in providing position selection inputs to a computer comprising:

  • (a) a multi-lobed cam member rotatable about the axis and having a switch position between each adjacent pair of said lobes;

    (b) first and second switches disposed for sequential operation by said lobes as said cam member is rotated, the sequence of operation of said switches being a function of the direction said cam member is rotated; and

    ,(c) logic means connected to said switches for determining the direction of rotation of said cam member from the sequence of operation of said switches and for counting positions from a known starting point as said switches are closed and opened by said lobes a presently selected position count being output to the computer whereby the presently selected position as input by the computer is equal to the number of positions said cam member is presently rotated about the axis from said known starting point.

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