Patent ID: 6925844
Filing Date: 2005-08-09
Classification: E05B,Y10T

Abstract:
1. A key comprising: a key head; a shank connected to said key head at a first end thereof and provided with a protrusion at a second end thereof, said shank having a pair of grooves extending oppositely laterally along a lengthwise direction thereof; a driving head movably mounted on said shank, said driving head having an inner opening in the center thereof and a cavity in one side thereof, the inner opening provided with a pair of protrusions oppositely located in an inner surface thereof; and a key blade portion rotatably movably mounted on said shank, said key blade portion comprising a blade head having an inner opening, a bearing assembly disposed between the blade head and the cavity of the driving head, and at least one helical key blade extending from a periphery of the inner opening of said blade head.