Anti-barricade assembly

A lockset, comprising:

• a housing;
• a bolt mounted in the housing for movement between an extended position and a retracted position;
• a turnhub rotatably mounted in the housing and engaged with the bolt, wherein rotation of the turnhub in a bolt-extending direction drives the bolt toward the extended position, and wherein rotation of the turnhub in a bolt-retracting direction opposite the bolt-extending direction drives the bolt toward the retracted position;
• and
• a spindle engaged with the turnhub, wherein the spindle is operable to exert torque on the turnhub in the bolt-retracting direction and is selectively operable to exert torque on the turnhub in the bolt-extending direction;
• wherein the housing includes a pair of stops configured to limit rotation of the spindle to a predetermined angular range;
• wherein the housing comprises an opening defined in part by the pair of stops;
• wherein the spindle comprises a boss and a spline extending along the boss;
• and
• wherein the boss is received in the opening, and the spline is operable to engage the stops.

An anti-barricade mechanism, comprising:

• a turnhub;
• a spindle rotatably mounted in the turnhub;
• a collar rotatably mounted on the spindle, wherein the collar is rotationally coupled with the turnhub and is axially movable relative to the turnhub;
• and
• a clutch mechanism, comprising:
• a first clutch component, wherein the first clutch component comprises a first ramp, and wherein one of the spindle or the collar comprises the first clutch component;
• and
• a second clutch component, wherein the other of the spindle or the collar comprises the second clutch component;
• and
• a bias member urging the clutch mechanism toward an engaged state in which the first clutch component and the second clutch component are engaged with one another;
• wherein the clutch mechanism is configured to selectively transmit a first torque in a first direction from the spindle to the collar to thereby rotate the turnhub in the first direction;
• wherein, when the first torque is below a threshold torque value, the first ramp causes transmission of the first torque from the spindle to the collar;
• and
• wherein, when the first torque exceeds the threshold torque value, the first ramp causes axial movement of the collar against the urging of the bias member to thereby permit relative rotation of the spindle and the turnhub.

A method of operating a lockset comprising a bolt, a turnhub, and a spindle, the method comprising:

• selectively transmitting a first torque in a bolt-extending direction from the spindle to the turnhub, wherein the selectively transmitting comprises:
• transmitting the first torque when the first torque is below a threshold torque, thereby causing rotation of the turnhub in the bolt-extending direction;
• and
• allowing relative rotation of the spindle and the turnhub when the first torque exceeds the threshold torque;
• extending the bolt in response to rotation of the turnhub in the bolt-extending direction;
• and
• limiting rotation of the spindle to a predetermined angular range.