Abstract: An anti-theft device for an automotive vehicle includes a lock and key housed separately and remote from a bolt and its actuating mechanism. The bolt portion is located in an inaccessible housing and connected to the lock by means of a burglar-proof connection. The electronic lock arrangement employed permits of a large number of combinations and thereby increases the security of the anti-theft device. By placing the bolt in an inaccessible housing, direct tampering with the locking bolt is precluded.

Abstract: An anti-theft device for locking the steering of an automobile vehicle comprises a crown gear (3) which is rotatable with the steering shaft (1) and has teeth (8) separated by concave sections having a part-circular profile (9), and a locking element on a spindle positioned parallel to the steering shaft (1) and rotatable by a lock (17), the locking element comprising a finger (10) having a length substantially equal to the radius of the concave sections (9) of the crown gear (3) and an outer part-circular face (14) of the same radius as the concave sections (9). The face of the locking finger engages a concave section to prevent rotation of the crown gear and steering shaft in the locked position and the finger is completely out of engagement with the concave sections and gear teeth to allow rotation of the crown gear and steering shaft when in the unlocked position.

Abstract: A tumbler lock is disclosed comprising a body and a cylindrical plug having an axial key passage rotatably mounted in the body. The plug and the body have aligned radial holes containing respective sets of tumblers, the tumblers in the body holes being spring urged toward the plug. The holes in the body have an outer conically tapering portion into which the respective tumblers are wedged prior to assembly of the lock and during assembly the tumblers are pressed out of these conical portions by a tool inserted into an opening in the body.