Abstract: A lock assembly has a lock barrel which slides in a housing so that a finger at the end of the barrel can release a latch. The lock barrel is prevented from sliding when the barrel is locked, by engagement of the finger with a blocking plate, but the barrel is freed when the key is inserted and turned. The finger is made so that it shortens if excessive axial force is applied while the barrel is locked. This shortening may be effected by including an easily rupturable connection between different sections of the finger. When the finger shortens, the connection ruptures and prevents the finger from getting near the latch to release it. Once the connection has ruptured, further movement of the barrel into the housing will bring the barrel into contact with the outer periphery of the blocking plate which is well supported.

Abstract: A lock and key set comprises two cylinder locks (1,2) each having a cylinder (3,3'), a barrel (4,4') rotatable in the cylinder, and a set of tumblers (9,9') radially movable in the cylinder into and out of engagement with the cylinder, and a key (20) having a bit (21) which can be inserted into the barrels of both locks and provided with two sets (23,24) of cam surfaces (22). The sets of tumblers (9,9') in each lock are movable by a respective one of the sets of cam surfaces in response to rotation of the key bit in clockwise and anticlockwise directions, so that when the two locks are incorporated in doors on opposite sides of a vehicle, they are actuated with opposite movements.