Detection device having energy transmitters located at verticall

Details Detection device having energy transmitters located at verticall Detection device having energy transmitters located at verticall

1988-01-29

1988-12-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

187 56, G01V 904, H01J 4014

Patent

active

047942487

ABSTRACT:
In the entranceway between an elevator car and a floor are two oppositely sliding doors. The approach of these doors is controlled by a detection system that senses the presence of objects between the doors. This system includes, on each door, a plurality of emitters which are vertically spaced apart the door edge, for radiating noncollimated light towards the edge of the other door. At the top and bottom portions of each door edge there is a sensor which can receive the radiation from the emitters on the other door edge. The emitters on each door edge are sequentially turned on and the sensors on the opposite door edge provide a corresponding signal as they are turned on, unless an obstruction is in the way, causing the detection system to generate a signal that thus indicates that an object is between the doors.

REFERENCES:
patent: 3746863 (1973-07-01), Pronovost
patent: 3805064 (1974-04-01), Kornylak
patent: 4247767 (1981-02-01), O'Brien et al.

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