Safety device for antitheft device

Claim 1

In a lock of the type having an elongated rotor and a stator, both being substantially coextensive axially and the rotor extending in the stator from an exposed end to an inner end of the rotor, for rotation by a key insertable and removable through the exposed end, by the user''s engaging the key head with his fingers, the improvement which comprises: a spring in the stator for selectively permitting and preventing said rotation of the rotor; an abutment mounted on the inner end of the rotor for rotation therewith, subject to engagement with said spring and for consequent blocking of further rotation of the rotor; and rod means axially displaceable in the stator, adjacent the periphery of the key head engaged by the user, and having one end protruding from the exposed end; the other end of the rod means and the spring being so constructed and arranged that, when the protruding end of the rod means is manually depressed the other end of the rod means urges the spring out of the normal position thereof, which blocks said further rotation, whereby user, when trying to remove the key from the rotor with fingers of one hand and at the same time to rotate the rotor, can effectively achieve such rotating only by first depressing the protruding end of the rod means with another finger of the same hand.