Abstract: A key of which the longitudinally extending grooves which code the key for insertion into the key receiving passage of a lock, extend both through the stem of the key which is inserted into the passage, and through the manipulating head part of the key so that the key blank can be produced by a stamping or pressing operation. There is also described a method of making the key.

Abstract: An anti-theft device for a motorcycle helmet. Said helmet has a continuous rib on the periphery of the edge of its opening. There is pprovided means for gripping said edge of the opening of the helmet behind said rib, and a lock device for locking said gripping means in the gripping position.

Abstract: A cylinder lock which has a cylindrical barrel provided with radially slidable plates elastically biased to project from said barrel into at least one groove in the body of the lock. Said plates project slightly from the barrel in the position to which said plates are returned inside the barrel by the key of the lock, whereby picking of the lock is made more difficult.

Abstract: An anti-theft safety device for an automobile vehicle comprising a lock having a rotatable barrel cooperating with a key which has a cylindrical body and is provided with a driver of non-circular cross-sectional shape which cooperates with a cavity of complementary shape formed in the barrel. Said barrel actuates, in the course of its rotation, means for locking at least one device essential for the operation of the vehicle and means for closing electric circuits. A rotatable electric switch is provided therein which is driven by cooperation of an opening of the switch with a driver, of complementary profile, on the key, the last-mentioned driver having sufficient length to continue to cooperate with said opening when the key has been partially extracted from the barrel and the driver for the barrel no longer drives the barrel.

Abstract: A lock having a key-actuated rotary barrel. Said key comprises a holding head axially slidably mounted on a body which head has a radial abutment. The lock has a key entrance surface spaced from the key entrance of the barrel and said surface has a key inserting opening having at least one radial abutment cooperable with said radial abutment of the key head for an axial position of the key head with respect to the key body.

Abstract: A cylinder safety lock the rotor of which carries a plurality of longitudinally extending parallel resiliently flexible elongated longitudinal elements arranged in circumferentially spaced relationship about and at the same radial distance from the longitudinal center line axis of the lock and engageable in the absence of a key with corresponding grooves of an inner coaxially positioned core portion of the stator of the lock to hold said rotor against rotation; said elongated elements being engageable with an inserted key for being deflected radially outwards either into an annular space left between said stator and core for unlocking said rotor when the key is correct or beyond said intermediate space into corresponding grooves of said stator to still lock said rotor when the inserted key is wrong.

Abstract: A compact anti-theft device for a motor vehicle comprises a cylindrical lock, a rotary electrical switch and a bolt, a driving connection is made between the lock and the switch which includes gears and the axes about which the switch and lock rotate are parallel and offset or are disposed at angles to each other.

Abstract: A switch is disclosed which comprises a rockable switch actuating element having contacts and a fixed switch terminal means. The rockable element is moved by operation of a lock of which the rotor has an eccentric extension disposed within and cooperating with an opening in said rockable actuating member so that upon insertion of the key into the rotor and turning of that rotor, the actuating element is moved to effect switching.