Override assembly for door lock systems having a clutch mechanism

1. A clutch mechanism for a door having a lockset with a lockable latch and actuator for operating the latch, the clutch mechanism comprising:

an input cam;

an output cam;

an engagement pin having an axis and being dimensioned and configured for axial movement between a first position, in which the engagement pin engages both the input cam so that the input cam and output cam rotate synchronously, and a second position, which allows independent rotational movement of the input cam and the output cam;

a movable camming surface cooperating with the engagement pin to move the axial position of the engagement pin between the first position and the second position;

override means biasing the position of the camming surface towards an override position to force the engagement pin to the first position; and

a removable interchangeable core, the core when installed blocking the override means from forcing the camming surface toward the override position, the core when not installed allowing the override means to bias the camming surface to the override position;

wherein the override means includes a coil spring.

2. A clutch mechanism for a door having a lockset with a lockable latch and actuator for operating the latch, the clutch mechanism comprising:

an input cam;

an output cam;

an engagement pin having an axis and being dimensioned and configured for axial movement between a first position, in which the engagement pin engages both the input cam so that the input cam and output cam rotate synchronously, and a second position, which allows independent rotational movement of the input cam and the output cam;

a movable camming surface cooperating with the engagement pin to move the axial position of the engagement pin between the first position and the second position;

override means biasing the position of the camming surface towards an override position to force the engagement pin to the first position; and

a removable interchangeable core, the core when installed blocking the override means from forcing the camming surface toward the override position, the core when not installed allowing the override means to bias the camming surface to the override position;

wherein the interchangeable core is elongated to define a longitudinal axis parallel to a drive axis.

3. A lock assembly for a door having a latch and an actuator for operating the latch, the lock assembly comprising:

a housing supported by the door;

a first body positioned in the housing and connected to the actuator for movement with the actuator relative to the door;

a second body positioned in the housing and operable to move the latch relative to the door, the second body being movable relative to the first body between a first position, in which the second body engages the first body, and a second position, in which the second body is disengaged from the first body;

a carriage supported in the housing;

a frame at least partially surrounding the carriage;

a core removably supportable on the base and being engageable with the frame; and

a spring positioned adjacent to the frame, and wherein, when the core is removed from the base, the spring is operable to move the frame relative to the housing, the carriage into engagement with the second body, and the second body toward the first position;

wherein the frame includes a first end and a second end, and wherein, when the core is supported in the housing, the first end is engageable with the core and the second end is engageable with the carriage.