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Apparatus for measuring position of ball joint

  • US 5,712,478 A
  • Filed: 04/18/1996
  • Issued: 01/27/1998
  • Est. Priority Date: 04/20/1995
  • Status: Expired due to Fees
First Claim
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1. Device for measuring three dimensional movement in a joint about three mutually orthogonal axes, where the joint comprises two joint halves which are moveable in relation to each other around the three orthogonal axis, with a common centre for each joint half, which device comprises:

  • at least two signal emitters located at a predetermined distance from each other in a first joint half;

    at least two signal collectors located at a predetermined distance from each other in a second joint half;

    at least one additional signal emitter or signal collector, the additional emitter being located at a predetermined distance from said at least two signal emitters and in the same joint half, the additional signal collector being located at a predetermined distance from said at least two signal collectors and in the same joint half;

    a signal generating unit connected to each signal emitter for causing the signal emitters to emit signals having unique characteristics; and

    a signal processing unit connected to each signal collector for detecting signals from the signal emitters.

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