Three dimensional coordinate measuring apparatus

  • US 5,794,356 A
  • Filed: 11/18/1996
  • Issued: 08/18/1998
  • Est. Priority Date: 02/23/1993
  • Status: Expired due to Term
First Claim
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1. A three dimensional coordinate measuring system comprising:

  • a movable arm having opposed first and second ends, said arm including a plurality of joints with each joint corresponding to a degree of freedom such that said arm is movable within a selected volume, each of said joints comprising a rotational transfer housing, said transfer housing including a housing shoulder and a shaft shoulder for housing a position transducer, said transducer producing a position signal;

    a support base attached to said first end of said movable arm;

    a probe attached to said second end of said movable arm;

    an electronic circuit for receiving said position signals from said transducer and providing a digital coordinate corresponding to the position and orientation of said probe in a selected volume;

    a groove in both the transfer housing shoulder and the transfer shaft shoulder to allow a preselected rotation of each transfer housing; and

    a shear shuttle for preventing mechanical overload due to mechanical stressing of said transfer housing.

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