Patent ID: 7810365

Claim:
A lock cylinder comprising: a housing including a cylindrical wall defining a cylindrical cavity, a recess defined in the cylindrical wall and in communication with the cavity, and an outer pin chamber communicating with the cavity; an outer pin slidably housed in the outer pin chamber; a plug disposed in the cavity and being rotatable within the cavity between a locked position and an unlocked position, the plug having a generally cylindrical outer surface and 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 slidably housed in the inner pin chamber, the inner pin being engageable with a key inserted into the key slot, and the inner pin being engageable with the outer pin when the plug is in the locked position; and a lock member in communication with the housing and the plug, the lock member movable into engagement with the recess to inhibit rotation of the plug to the unlocked position in response to partial rotation of the plug from the locked position without an appropriate key in the key slot.