Optical door lock

Details Optical door lock Optical door lock

1997-08-15

1999-09-14

Noland, Kenneth W.

Elevator, industrial lift truck, or stationary lift for vehicle

With barrier for regulating access to load support

Including slideably mounted barrier on load support

187280, B66B 1306

Patent

active

059507675

ABSTRACT:
A safety chain of an elevator system utilizes optical fiber to verify mechanical locking of elevator doors. The elevator doors have locks which incorporate the optical fiber to determine if each of the doors has been locked. The optical safety chain provides the necessary feedback to the elevator controller for safe operation of the elevator system.

REFERENCES:
patent: 5454447 (1995-10-01), Kulak et al.
patent: 5487448 (1996-01-01), Schollkopf et al.
patent: 5616895 (1997-04-01), Spiess
U.K. Search Report dated Sep. 12, 1997; Serial No. GB 9713687.3.
U.S. Patent application Serial No. 08/672,680 filed Jun. 28, 1996 entitled "Car Door Lock"; Marc F. Chevilliard, et al. (OT-2707).
U.S. Patent application Serial No. 08/893,430 filed Jul. 11, 1997 entitled "Car Door Locking System"; Ali Bozorgzadeh, et al.

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