E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
70/57
E05B 19/02 (2006.01)
Patent
CA 1135522
Abstract A flat key has laterally projecting ribs which extend along the key and which are adapted to enter slots in the key hole of a lock. The slots communicate with bores which receive locking pins which are pushed outwardly when engaged by the ribs. When not engaged by ribs of correct height or in the absence of ribs the locking pins are not pushed out to the extremities of the bores, thus leaving recesses into which a housing pin falls to prevent rotation of the central cylindrical part of the lock. According to the invention two additional ribs are provided which are provided with spaced discontinuities or depressions. The lock is provided with security pins in addition to the locking pins and these security pins are intended to be received in the discontinuities or depressions of the key. When the correct key is inserted the locking pins are pushed outwardly as before and the security pins are urged inwardly out of engagement with locking recesses provided in the housing. This permits rotation of the central cylinder. With the wrong key or if a tool is used to manipulate the lock, one or more of security pins is pushed outwardly into locking engagement with the housing thus preventing rotation even if all of the locking pins are successfully released.
361245
Smart & Biggar
Zeiss Ikon A.g.
LandOfFree
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