Patent ID: 7574883

Claim:
A lock cylinder comprising: a housing defining a cylindrical cavity, and an outer pin chamber communicating with the cavity, the outer pin chamber being adapted to house an outer pin; a plug disposed in the cavity and being rotatable within the cavity between a locked position and an unlocked position, the plug having an inner pin chamber that is aligned with the outer pin chamber when the plug is in the locked position; a key slot disposed at least partially through the plug, the key slot communicating with the inner pin chamber; an inner pin housed in the inner pin chamber for movement along an axis, the inner pin being engageable with a key inserted into the key slot, the inner pin being engageable with the outer pin when the plug is in the locked position, and the inner pin including an outer surface having therein two non-axial grooves; and an engagement member that is supported by the plug and that extends into one of the grooves.