Presence detector for mobile storage systems

Details Presence detector for mobile storage systems Presence detector for mobile storage systems

1995-08-31

1997-09-23

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340556, 312201, G01V 822

Patent

active

056707789

ABSTRACT:
The movable storage system includes a plurality of successive storage units, at least the intermediate storage units being mobile so as to form an access aisle between selected successive storage units. A detector system includes an array of infrared light sources on a lower edge of a first selected storage unit, a reflector on a lower edge of a second selected successive storage unit, and an array of corresponding infrared sensors on an upper edge of the first selected storage unit. Infrared light is directed from the light sources horizontally just above the floor to the reflector and reflected diagonally upward to the infrared sensors thereby detecting the presence or absence of obstructions both near the floor and at upper areas of the access aisle. The light sources and corresponding light sensors are sequentially activated and deactivated to eliminate cross-talk and interference between the various sensors.

REFERENCES:
patent: 4384280 (1983-05-01), Haag
patent: 5225689 (1993-07-01), Buckle et al.
patent: 5359191 (1994-10-01), Griesemer et al.
patent: 5408089 (1995-04-01), Bruno et al.

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