Failsafe sensing edge for automatic doors and gates

Details Failsafe sensing edge for automatic doors and gates Failsafe sensing edge for automatic doors and gates

1991-02-22

1992-01-07

Fields, Carolyn E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, 49 26, 49 27, E05F 1520

Patent

active

050794175

ABSTRACT:
A failsafe or self-monitoring sensing edge for an overhead door comprising a channel mounted on the bottom edge of the door having a pair of downwardly extending arms which are spaced. An outer covering of soft material is attached to said channel for enclosing the arms. The covering supports within a rigid member extending upwardly through said arms terminating in an actuating member. On one end of the channel is a light source and the other end is a photoswitch. When the covering is depressed upwardly as a result of an obstacle in the path of the door, the actuating member blocks the light beam and the photoswitch gives off a signal which can be used to terminate or reverse motion of the door.

REFERENCES:
patent: 3001038 (1961-09-01), Gessell
patent: 3003303 (1967-02-01), Miller
patent: 3462885 (1969-08-01), Miller
patent: 4115952 (1978-09-01), French
patent: 4452009 (1984-06-01), Baumeler et al.
patent: 4773183 (1988-09-01), Okushima et al.
patent: 4944116 (1990-07-01), Mewald
patent: 4953608 (1990-09-01), Larsson

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