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TRANSDUCER DEVICE FOR ELECTRICALLY OPERATED BRAKES

  • US 3,823,985 A
  • Filed: 01/12/1973
  • Issued: 07/16/1974
  • Est. Priority Date: 01/12/1973
  • Status: Expired due to Term
First Claim
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1. A pressure responsive variable electrical resistance electric brake control device comprising, a flexible bellows having a chamber therein and capable of being contracted and expanded in a given direction in response to forces applied oppositely thereto generally in said given direction, a pair of electrically conductive contacts associated with said bellows disposed in spaced relation along said given direction, a powdered magnetic material received in said bellows chamber between and in engagement with both of said electrically conductive contacts, means providing a magnetic field having lines of magnetic force extending within said bellows chamber generally in said given direction, and force application means adapted to foreshorten said flexible bellows and thereby apply pressure to said powdered material in proportion to the force applied by an operator in actuating the brake system of a towing vehicle, whereby contraction of said bellows in response to said applied forces compresses said powdered magnetic material received in said bellows and thereby decreases the electrical resistance between said conductive contacts in proportion to the value of the applied forces.

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