Lock cylinder with locking member

A lock cylinder comprising:

• a housing including a cylindrical wall defining a cylindrical cavity, an outer pin chamber communicating with the cavity and defining a vertical axis, and a recess communicating with the cavity, the recess being angularly spaced from the vertical axis of the outer pin chamber;
• 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 movably mounted on the plug, the lock member being movable into the recess in response to partial rotation of the plug from the locked position without an appropriate key in the key slot.

A lock cylinder comprising:

• a housing including a cylindrical wall defining a cylindrical 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• a lock member mounted on the plug for movement between a blocking position and a withdrawn position, the lock member being engageable with the inner pin such that the lock member is held in the withdrawn position by the inner pin during rotation of the plug to the unlocked position with an appropriate key in the key slot, the lock member movable into the blocking position and configured to disable the lock cylinder when no outer pin and no inner pin are engaged with the lock member.

A lock cylinder comprising:

• a housing including a cylindrical wall defining a cylindrical cavity, an outer pin chamber communicating with the cavity, and a recess defined in the cylindrical wall and in communication with the cavity, the recess defined by a wall sloping generally downward away from 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 with a groove defined by a bottom wall coplanar and aligned with the wall defining the recess in response to partial rotation of the plug toward the unlocked position, the plug further 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 slidable within the groove along the bottom wall between a withdrawn position and a blocking position, the lock member engageable with the inner pin such that the lock member is held in the withdrawn position by the inner pin during rotation of the plug to the unlocked position with an appropriate key in the key slot, the lock member moving into the recess such that the lock member is in the blocking position without an appropriate key in the key slot.