Tamper-proof door switch and latch device

Closure fasteners – Bolts – Swinging

Patent

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Details

2922515, 292337, 2923417, 292DIG69, E05C 306

Patent

active

055204244

ABSTRACT:
In a door latching and switch contact controlling device, an actuator having first and second radially extending angularly spaced apart members is mounted on a common shaft in a housing with a latching member for the member and actuator to rotate together. A striker fastened to a door strikes the first radially extending member when the door closes to turn the actuator so the second member rotates into an opening in the striker to thereby conceal the first member. An electroresponsive device positions a latching element into the path of a stop on the latching member when the device is energized, thereby preventing the actuator from turning reversely if an attempt is made to open the door. The device locks the door if it is closed, if the actuator is rotated by the striker and the electroresponsive device is energized, whereupon a pair of contacts are compelled to make contact to complete a circuit for signalling a controller that it can initiate existence of a hazardous condition that is prevented from being accessed by the locked door.

REFERENCES:
patent: 2751053 (1956-06-01), Birkemeier
patent: 3890813 (1975-06-01), Cothron
patent: 4755647 (1988-07-01), Nishikawa et al.
patent: 5176417 (1993-01-01), Bauer

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