| 摘要 |
<p>A cylinder lock having a barrel (1) and a cylinder (2) and being actuable by a key (5) having a round shaft (51). The round shaft (51) has provided along its one longitudinally extending planar surface (512) a plurality of substantially rectangular recesses (52) which correspond with pin portions of lower tumblers (221) normally extending into the keyhole (22) of the cylinder (2) and biased by springs (142) and upper tumblers (141) in the barrel (1), such that when the key (5) is inserted into the keyhole (21) and rotated to a predetermined position to allow the pin portions (221) to be received in the corresponding recesses (52), the cylinder (2) can be driven to rotate relative to the barrel (1) by the turning force of the key (5) transmitted to the pin portions (221) through their contact with the side walls of the recesses (52) if the key (5) is further rotated, thereby locking or unlocking the cylinder lock. <IMAGE></p> |
