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Chucking device for interchangeable holding of probe pins in a coordinate-measuring instrument

  • US 4,637,119 A
  • Filed: 05/31/1984
  • Issued: 01/20/1987
  • Est. Priority Date: 06/03/1983
  • Status: Expired due to Term
First Claim
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1. A clamping device for the interchangeable attachment of a work-contacting probe pin or probe-pin combination to the probe head of a coordinate-measuring instrument, wherein the probe pin or probe-pin combination has a connecting member of magnetic flux-conducting material, said clamping device comprising a reference support having means engageable with an applied connecting member in such manner as to unequivocally determine its position in the clamping device on the probe head, a permanent magnet and an electromagnet whose field is superposed on the field of the permanent magnet, the electromagnet being an electrical coil surrounding the permanent magnet and utilizing the permanent magnet as the central core of the electromagnet, the permanent magnet being movable toward and away from the reference support and being so positioned with respect to a connecting member applied to said support as to attract and retain the connecting member in its unequivocally determined position;

  • the electromagnet, when excited in polarized opposition to the permanent magnet, effectively neutralizing the attraction of the permanent magnet to the applied connecting member; and

    spring means reacting between the support and the permanent magnet and urging the magnet in the direction away from the support and with a force which is less than the force of permanent-magnet attraction to an applied connecting member.

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