Patent ID: 7978458

Claim:
A locking device for an electrical switch, displaceably guidable in a withdrawable rack by converting a rotation movement, exerted by way of an actuating crank into a rotation of a traveling shaft by way of an actuating shaft, the actuating shaft and the traveling shaft are at right angles with respect to one another and movable, with the switch located in a position, from a release position, in which the switch is displaceable in the withdrawable rack, into a locking position, the locking device in the locking position blocking a displacement of the switch in the withdrawable rack in a direction, and the actuating shaft being operatively connected to the actuating crank by being fitted onto an end of the actuating crank, wherein the locking device is only movable into the locking position if the actuating crank is blocked against actuation, the actuating crank remaining in operational contact with the actuating shaft when the locking device is in the release position and in the locking position, the locking device further including a querying device that queries the position of the switch, the querying device only being movable from an open position into a blocking device position if the actuating crank is blocked against actuation, and a blocking device that blocks the actuating shaft, the blocking device being coupled to the querying device and being provided to block the displacement of the switch, an actuating element, movable from a free position into a blocking position, being provided to block the actuation of the actuating crank; a sensing device, movable from a first position corresponding to the blocking position of the actuating element into a second position corresponding to the free position of the actuating element, for sensing the position of the actuating element; and a first blocking device, coupled to the sensing device by a coupling section, for blocking the querying device, the first blocking device only releasing the querying device such that it can be moved into its blocking position if the actuating element is located in its blocking position.