System for counting persons in a high density mobile storage sys

Details System for counting persons in a high density mobile storage sys System for counting persons in a high density mobile storage sys

1996-11-20

1998-12-15

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2503381, 312201, G01V 810, G01V 820, A47B 5300

Patent

active

058500820

ABSTRACT:
High density mobile storage comprising a mobile carriage between two stationary end shelving structures. Photoelectric light beam emitters and receivers are installed in the stationary structures. The light beams emitted pass through a passage in the mobile carriage and through the aisles between the mobile carriage and stationary structures. The passage in the mobile carriage is shielded to prevent interference with the light beams. The photoelectric emitters and receivers cooperate with a control to prevent rolling of the mobile carriage in response to sensing the presence of a person in any aisle, and to enable rolling of the mobile carriage in response to sensing the absence of persons in all aisles. The light beams are located to produce reliable sensing of persons entering and leaving the aisles.

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