DEVICE FOR MONITORING THE STATE OF A SAFETY DEVICE ON A MACHINE
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United States of America Patent
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Issued Date -
Jun 2, 2011
app pub date -
Nov 5, 2009
filing date -
Nov 6, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a device (1) for monitoring the state of a safety device (2) of a machine (4), in particular a safety switch for monitoring the closed state of a safety door or the like, the device (1) having a switch housing (22, 24) and an actuator (8), which, when the safety device (2) is closed, cooperates with a switch actuating element (14) movably mounted in the switch housing (22, 24) and the closed state of the safety device (2) can be signaled thereby, and the device (1) having a locking device by which the closed state of the safety device (2) can be releasably locked, characterized in that by applying excessive force to the actuator (8) against the action of the locking device, the switch actuating element (14) can be brought into a fail-safe position, from which the switch actuating element (14) can no longer be transferred by the actuator (8) into a position in which the device (1) signals the locked state of the safety device (2), and the device (1) signals the unlocked state of the safety device (2) in this fail-safe position of the switch actuating element.
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