Safety switch

Details Safety switch Safety switch

2006-03-03

2009-12-15

Friedhofer, Michael A (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Actuators

C200S043040

Reexamination Certificate

active

07633029

ABSTRACT:
A safety switch capable of detecting withdrawal of an actuator from a switch main unit in a sure and reliable manner even when the safely switch, including a lock mechanism, is in a locked condition and an attempt is made to forcibly withdraw the actuator from the switch main unit. Even when a drive cam becomes capable of rotation since not less than one of a notch cut-out section and a lock member is broken by forcibly extracting an actuator with rotation of the drive cam locked, a cam curve section of the drive cam and an operating rod are in a normal condition and free of breakage. Accordingly, if the drive cam rotates in a counter-clockwise direction, normally-closed contacts of a contact section adopt an open condition normally, and even in situations where the actuator is withdrawn from the switch main unit with a force equal to or greater than the fracture strength of the safety switch, withdrawal of the actuator from the switch main unit can be detected in a sure and reliable manner.

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U.S. Appl. No. 11/919,375, Komori et al., filed Oct. 25, 2007.

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