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Electric brake adjuster

  • US 3,917,035 A
  • Filed: 02/18/1975
  • Issued: 11/04/1975
  • Est. Priority Date: 02/18/1975
  • Status: Expired due to Term
First Claim
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1. In an electro-magnetically actuated brake having a field coil, an annular magnet, a friction element secured to and extending from said magnet, and a forwardly and reversibly rotatable member to be braked by frictional engagement of said friction element therewith under a force depending upon the strength of the magnetic field generated in said magnet and said rotatable member by energization of said field coil, mechanism forming a magnetic flux path between said magnet and said rotatable member and including means adjusting said mechanism as said friction element wears to prevent braking force engagement between said mechanism and said rotatable member while permitting braking force engagement between said friction element and said rotatable member, said mechanism comprising:

  • first and second annular threaded sections respectively provided on the inner and outer peripheries of said annular magnet;

    first and second annular magnet poles having threads thereon and threaded on said threaded sections for rotational movement relative to said annular magnet and resultant axial movement as said poles are threaded further onto said threaded section;

    said magnet poles having faces immediately adjacent said rotatable member and engageable therewith, upon wear of said friction element and brake energization, sufficiently to be rotated on said magnet in the direction of rotation of said rotatable member during forward rotation of said rotatable member, and by thread action being moved axially away from said rotatable member sufficiently that braking force is exerted on said rotatable member by said friction element and not by said magnet poles;

    said magnet and said threaded sections thereof and said magnet poles and said rotatable member providing the magnetic flux path for said brake; and

    selectively releasable means on said magnet and saId magnet poles preventing rotation of said magnet poles upon engagement with said rotatable member during reverse rotation of said rotatable member.

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