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Building elevator door restrictor

  • US 5,918,705 A
  • Filed: 11/10/1997
  • Issued: 07/06/1999
  • Est. Priority Date: 11/10/1997
  • Status: Expired due to Fees
First Claim
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1. Apparatus for preventing opening of a door of an elevator car by persons inside the car when the car is between unlocking zones situated at landings along a vertical path of travel of the car which apparatus comprises:

  • an elevator car having a door and being travelable between unlocking zones,a locking member carried by the car that is movable between a first position at which the member blocks opening of the door and a retracted position at which the member releases the door, said apparatus further having a photoelectric unlocking zone detector carried by said car and an actuator which moves said locking member to said retracted position thereof in response to detection of an unlocking zone,said unlocking zone detector having a light emitting component and a light detecting component which are secured to said elevator car and which are spaced apart in a horizontal direction and which are separated by an open region that is outside of said car, said light emitting component being positioned to direct light to said light detecting component along a light path which extends across said region that is outside of said car, anda plurality of vertically spaced apart stationary opaque door zone vanes disposed along the path of travel of said car, said door zone vanes being positioned to interrupt said light path and to block the passage of light from said light emitting component to said light detecting component when said car is within said unlocking zones.

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