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VANE LOCAL CONTROL SYSTEM FOR ELEVATORS

  • US 3,815,711 A
  • Filed: 02/08/1973
  • Issued: 06/11/1974
  • Est. Priority Date: 02/08/1973
  • Status: Expired due to Term
First Claim
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1. In a system for controlling the approach of an elevator cab to a selected floor level, said system including means for commanding a pre-determined cab speed for discreet intervals of distance away from a floor level of intended landing, motor drive control means for causing a drive motor to operate at said commanded speed, and car velocity sensor means for determining actual car velocity, wherein the improvement comprises:

  • a plurality of position sensing means carried on said elevator cab, said position sensing means for providing a plurality of discreet signals in response to the elevator reaching a predetermined distance above or below said floor level, said position sensing means comprising spaced radiation emitting and radiation sensing elements, vane means mounted in said elevator shaft for interrupting said radiation from reaching successive radiation sensors during the approach of said cab to said floor level, logic means for combining the outputs of said sensors close to a position corresponding to the floor level to produce a pOsition output signal only when both sensors are covered by said vane.

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