E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
E05B 27/00 (2006.01) E05B 19/00 (2006.01)
Patent
CA 2097002
The invention relates to an improvement in a key-actuated pin tumbler lock of the type having: a cylindrical core rotatable in a lock housing via a rotational path, a plurality of pin tumblers received in bores journalled in the core and lock housing, each bore containing a set of pin tumblers comprising one core pin and one housing pin, biassed towards the core, and having a pin junction therebetween, and a key slot in the core, whereby insertion in the key slot of a key having thereon suitable bits is adapted to align the pin junctions with the rotational path of the core in the lock housing, and to permit the core to rotate within the housing. The improvement comprises a retaining mechanism adapted to bias at least one of the pin tumblers towards engagement with the rotational path of the core, the mechanism being adapted to restrain rotation of the core until release of the or each biassed pin tumbler upon insertion of a key including, as well as the suitable bits, means for disengaging the retaining mechanism from engagement with the or each biassed pin tumbler.
Preddey Brian
Master Locksmiths Association Of Australasia Limited
Shapiro Cohen
LandOfFree
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