Protective device for movable shelves

Details Protective device for movable shelves Protective device for movable shelves

1984-03-30

1986-12-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340556, G01V 904

Patent

active

046298835

ABSTRACT:
A protective device for movable mechanical shelves, such as paternoster shelves, discontinues movement of the shelves when obstructions are located in their path. The protective device includes light barriers positioned at the boundaries of an opening at which the shelves can be selectively positioned. Electric circuitry connects the light barriers and the motor for driving or moving the shelves. The electric circuitry permits the testing of the operational readiness of the overall protective device during the movement of the shelves.

REFERENCES:
patent: 3242341 (1965-06-01), Woodward
patent: 3360654 (1967-12-01), Muller
patent: 3612884 (1971-10-01), Linardos et al.
patent: 3842260 (1974-10-01), Christensen et al.
patent: 4266124 (1981-05-01), Weber et al.
patent: 4309696 (1982-01-01), Nagai et al.

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