E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
70/55
E05B 27/00 (2006.01)
Patent
CA 1250150
12 ABSTRACT A cylinder lock (1) has a normal locking mode (12 o'clock position) and a service locking mode (10 o'clock position). When the cylinder plug (3) is left in the service mode of the lock, with the aid of standard key, the lock can be turned with the aid of a service key (9). The service key is latched against withdrawal in the normal mode of the lock, by means of an intermediate pin (7') of larger diameter than a corresponding upper pin (4) in the normal mode of the lock. The intermediate pin can be received in a widened part (3b') of a corresponding pin - channel (3a') in the cylinder plug, but is unable to enter the pin-channel (2a) of the cylinder housing of smaller diameter, hence latching the service key (9). Subsequent to using the service key (9), the cylinder is returned to the normal locking mode (12 o'clock position) with the aid of the standard key, whereafter the lock can only be opened with the aid of the standard key. Each of the two modes can be defined by a spring-biased ball disposed in a suitable pin-channel and arranged to snap-in a corres- ponding empty pin-channel in the plug. (Figures 3 and 6)
470398
Gkn-Stenman Ab
Kirby Eades Gale Baker
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