Key operated safety interlock switch

Details Key operated safety interlock switch Key operated safety interlock switch

1999-03-30

2000-01-11

Friedhofer, Michael

Electricity: circuit makers and breakers

Switch activation inhibitor

Removable actuator

200 17R, 200 4307, 200 6162, H01H 2700

Patent

active

060138815

ABSTRACT:
An operating head assembly for a key operated safety switch contains within its housing two inwardly biased locking plates surrounding and locking an operating cam. A key with beveled faces forces the locking plates outward, freeing the cam to rotate. A cross bar on the key rotates the cam to the operating position. The safety switch is thus not easily defeated by simple devices.

REFERENCES:
patent: 4524251 (1985-06-01), Schulz
patent: 4658102 (1987-04-01), Seim et al.
patent: 4963706 (1990-10-01), Mohtasham
patent: 5464954 (1995-11-01), Kimura et al.
patent: 5473127 (1995-12-01), Falcon et al.
patent: 5516993 (1996-05-01), Wecke et al.
patent: 5703339 (1997-12-01), Rapp et al.
Honeywell, "GK Solenoid Key Operated Safety Interlock Switch", Product Sheet, Dec. 1997, Honeywell Micro Switch. Freeport. Illinois. 61032. USA.

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