Key switch with a locking arrangement on a rotating element

Details Key switch with a locking arrangement on a rotating element Key switch with a locking arrangement on a rotating element

1993-02-01

1996-01-30

Luebke, Renee S.

Electricity: circuit makers and breakers

Switch activation inhibitor

Removable actuator

200 4307, H01H 2700

Patent

active

054882079

ABSTRACT:
A key switch which could, for example, be used to switch a power supply for a machine tool on and off, has a locking mechanism on a rotating element of a key disengages the locking mechanism on the rotating element. The key also engages the guide on the rotating element, thereby initiating the rotation of that element and activating the switching element. If an object other than the key is inserted, the lock on the rotating element will not be released, and the rotating element will be prevented from moving, so that the switching element cannot be activated. Furthermore in another embodiment, a machine stop detection signal is fed to an internal solenoid which prevents removal of the key until the machine stops completely.

REFERENCES:
patent: 4904829 (1990-02-01), Berthaud et al.

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