Patent ID: 7360382

Claim:
A cylinder lock assembly comprising: a lock housing having an inner core extending between first and second ends, said inner core defining a core axis extending through said first and second ends; a lock cylinder received in said inner core for rotational and axial movement in said inner core, said lock cylinder including an axially extending key slot for receiving a key therein and a radially extending slot extending through said lock cylinder and intersecting said key slot, said lock cylinder being axially movable between a rearward position in said inner core and a forward position in said inner core, and a rotation plate assembly received in said radially extending slot and blocking at least a portion of said key slot, said rotation plate including first and second rotation plate members being movable relative to each other and a first biasing member engaging said first and second rotation plate members for urging said second rotation plate member radially away from said first rotation plate member said first and second rotation plate members defining a space therebetween having a variable radial dimension for receiving therethrough the key received in said key slot, wherein upon insertion of the key through said space and into said key hole, the key engages said first rotation plate member to urge said first rotation plate member radially toward said second plate member against the urging of said first biasing member to allow the key to enter said key slot through said space and lock said lock cylinder in said forward position.