Anti-barricading turn hub assembly for a door lockset

A turn hub assembly, comprising:

• a spindle rotatable in each of a locking direction and an unlocking direction opposite the locking direction;
• a turn hub mounted to the spindle for rotation in each of the locking direction and the unlocking direction;
• and
• a clutch engaged between the spindle and the turn hub, the clutch having an engaged condition in which the clutch permits rotation of the turn hub by the spindle in the unlocking direction and at least selectively prevents rotation of the turn hub by the spindle in the locking direction, the clutch having a disengaged condition in which the clutch rotationally decouples the spindle from the turn hub;
• wherein the clutch comprises a sidebar having a coupling position in the engaged condition of the turn hub assembly and a decoupling position in the disengaged condition of the turn hub assembly;
• and
• wherein, with the clutch in the engaged condition:
• rotation of the spindle in the unlocking direction does not drive the sidebar from the coupling position to the decoupling position such that the clutch remains in the engaged condition;
• and
• rotation of the spindle in the locking direction urges the sidebar from the coupling position toward the decoupling position, thereby moving the clutch to the disengaged condition.

A lockset, comprising:

• a bolt having an extended position and a retracted position;
• a spindle;
• a thumb turn engaged with the spindle;
• a turn hub releasably engaged to the spindle, wherein rotation of the turn hub in an unlocking direction drives the bolt toward the retracted position, and wherein rotation of the turn hub in a locking direction drives the bolt toward the extended position;
• a lock cylinder including a keyway and operable to rotate the turn hub in each of the locking direction and the unlocking direction by a key;
• and
• a clutch selectively coupling the spindle and the turn hub for joint rotation in an unlocking direction;
• wherein the clutch has a coupling state in response to the thumb turn being free to rotate in the unlocking direction, the clutch in the coupling state coupling the spindle and the turn hub for joint rotation in the unlocking direction by either of the key or the thumb turn;
• wherein the clutch is configured to move from the coupling state to a decoupling state in response to rotation of the turn hub in the unlocking direction by the key when the thumb turn is blocked from rotating in the unlocking direction, the clutch in the decoupling state permitting the key to rotate the turn hub in the unlocking direction while the thumb turn remains stationary;
• wherein the clutch in the coupling state is configured to remain in the coupling state in response to rotation of the thumb turn in the unlocking direction such that the thumb turn remains operable to rotate the turn hub in the unlocking direction;
• and
• wherein the clutch is configured to continuously transmit torque in the unlocking direction from the spindle to the turn hub.

An anti-barricading turn hub assembly for use with a lockset including a movable bolt, the turn hub assembly comprising:

• a spindle engaged to a thumb turn of the lockset;
• a turn hub releasably engaged to the spindle, wherein the turn hub is rotatable by a key;
• and
• a clutch selectively coupling the spindle and the turn hub for joint rotation in an unlocking direction;
• wherein the clutch has a coupling state in response to the thumb turn being free to rotate in the unlocking direction, the clutch in the coupling state coupling the spindle and the turn hub for joint rotation in the unlocking direction by either of the key or the thumb turn;
• wherein the clutch is configured to move from the coupling state to a decoupling state in response to rotation of the turn hub in the unlocking direction by the key when the thumb turn is blocked from rotating in the unlocking direction, the clutch in the decoupling state permitting the key to rotate the turn hub in the unlocking direction while the thumb turn remains stationary;
• wherein the clutch in the coupling state is configured to remain in the coupling state in response to rotation of the thumb turn in the unlocking direction such that the thumb turn remains operable to rotate the turn hub in the unlocking direction;
• and
• wherein the clutch comprises:
• a slot formed in one of the turn hub or the spindle;
• a groove formed in the other of the turn hub or the spindle, the groove having a straight sidewall and a tapered sidewall;
• and
• a side bar seated in the slot, a nose of the side bar including a flat surface and a tapered surface;
• wherein with the clutch in the coupling state, the nose is received in the groove such that the flat surface faces the straight sidewall and the tapered surface faces the tapered sidewall;
• and
• wherein with the clutch in the decoupling state, the nose is removed from the groove.