Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-09-02
1995-04-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250561, 312201, 340541, G01V 904
Patent
active
054080894
ABSTRACT:
A storage system with movable units is equipped with emitters for providing a series of radiant energy beams directed along an array of parallel paths through passages beneath the movable units. A control computer stops movement of the movable units in response to blockage of any path. Additionally, the system compares the identities of paths blocked on one cycle with those blocked on a prior cycle to determine whether unblocking of a path is due to a person or other object leaving the work area or is due by a condition in which the system has lost track of the person or object. In the latter case, the system inhibits operation of the movable units even if all paths are unblocked.
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Brochure entitled "Spacesaver Tech Data," The Spacesaver Group, Spacesaver Corporation, 1993.
Bruno Gerald R.
Davidian Avner
Allen Stephone B.
Nelms David C.
White Storage & Retrieval Systems, Inc.
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