Mechanisms are provided to thwart an overtorquing attack on a cylindrical lockset. The cylindrical lockset comprises a lock cage, a split retractor assembly, and a torque-attack-activated spring-loaded blocker assembly coupled to the lock cage. The blocker assembly is set to a default non-blocking c
Mechanisms are provided to thwart an overtorquing attack on a cylindrical lockset. The cylindrical lockset comprises a lock cage, a split retractor assembly, and a torque-attack-activated spring-loaded blocker assembly coupled to the lock cage. The blocker assembly is set to a default non-blocking configuration. An overtorquing attack triggers the blocking assembly into a blocking setting. When in the blocking setting, the blocking assembly blocks movement of at least an outside door portion of a retractor assembly from translating into a latch-retracting position, but does not block the inside door handle from retracting the latch. A new split retractor assembly is also provided.
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1. A cylindrical lockset designed to thwart an overtorquing attack, the cylindrical lockset comprising: a latch;a lock cage configured to be mounted inside a cylindrical bore of a door that passes from an outside door face to an inside door face;a retractor assembly housed in the lock cage and confi
1. A cylindrical lockset designed to thwart an overtorquing attack, the cylindrical lockset comprising: a latch;a lock cage configured to be mounted inside a cylindrical bore of a door that passes from an outside door face to an inside door face;a retractor assembly housed in the lock cage and configured to enable inside and outside door handles to retract the latch;a lock housed in the lock cage and operative, when activated, to prevent a person from using the outside door handle to open the door; anda torque-attack-activated blocker assembly coupled to the lock cage, the blocker assembly being coupled in a default non-blocking setting and operative to be activated by an overtorquing attack into a blocking setting;wherein the blocker assembly, when in the blocking setting, blocks the outside door handle from causing the retractor assembly to retract the latch. 2. The cylindrical lockset designed to thwart an overtorquing attack of claim 1, wherein the blocker assembly, when in the blocking setting, does not block the inside door handle from retracting the latch. 3. The cylindrical lockset designed to thwart an overtorquing attack of claim 1, wherein the retractor assembly is constrained for translational movement along or parallel to a longitudinal axis defined by extended and retracted positions of the latch. 4. The cylindrical lockset designed to thwart an overtorquing attack of claim 3, wherein the blocker assembly, when in the blocking setting, blocks movement of at least an outside door portion of the retractor assembly from translating into a latch-retracting position. 5. The cylindrical lockset designed to thwart an overtorquing attack of claim 4, wherein the retractor assembly comprises an inner cam-activated retractor and an outer cam-activated retractor, the outer cam-activated retractor configured, when activated and not blocked by the blocker assembly, to press the inner cam-activated retractor to retract the latch. 6. The cylindrical lockset designed to thwart an overtorquing attack of claim 5, wherein: the blocker assembly comprises a pair of stopping tabs, and the outer cam-activated retractor comprises a pair of stop elbows; andwhen the blocker assembly is in a blocking setting, the stopping tabs interfere with the stop elbows to block the outer cam-activated retractor from moving into a latch-retracting position. 7. The cylindrical lockset designed to thwart an overtorquing attack of claim 1, further comprising a spindle bearing staked to the lock cage, the spindle bearing coupled to the blocker assembly and maintaining it in the non-blocking setting as long as the outside door handle is not subjected to an overtorquing attack. 8. The cylindrical lockset designed to thwart an overtorquing attack of claim 7, wherein the spindle bearing is configured to rotate, relative to the lock cage, when the outside door handle is subjected to an overtorquing attack. 9. The cylindrical lockset designed to thwart an overtorquing attack of claim 1, further comprising a holder assembly positioned on an inside of the lock cage, the holder assembly holding the blocker assembly in the non-blocking setting as long as the outside door handle is not subjected to an overtorquing attack, wherein an overtorquing attack causes rotation of the holder assembly, causing the blocker assembly to move into the blocking setting. 10. The cylindrical lockset designed to thwart an overtorquing attack of claim 9, wherein the holder assembly comprises posts situated on a cage retaining flange of a spindle bearing staked to the lock cage, the posts holding corresponding trigger tabs of the blocker assembly in the non-blocking setting. 11. The cylindrical lockset designed to thwart an overtorquing attack of claim 1, wherein the blocker assembly is spring-loaded to spring from its non-blocking setting to its blocking setting when the outside door handle is subjected to an overtorquing attack. 12. The cylindrical lockset designed to thwart an overtorquing attack of claim 11, wherein the blocker assembly comprises a pair of blockers, each blocker comprising a trigger tab and a stopping tab, each blocker being spring loaded by a spring. 13. A cylindrical lockset designed to thwart an overtorquing attack, the cylindrical lockset comprising: inner and outer spindles configured to receive inside and outside door handles;a latch;a lock cage configured to be mounted inside a cylindrical lock door bore that passes from an outside door face to an inside door face;a retractor assembly housed in the lock cage and configured to enable the inside and outside door handles to retract the latch; anda trap coupled to the lock cage, the trap operable to be activated by an overtorquing attack to prevent the outer spindle from causing the retractor assembly to retract the latch. 14. The cylindrical lockset designed to thwart an overtorquing attack of claim 13, wherein the trap is spring-loaded. 15. The cylindrical lockset designed to thwart an overtorquing attack of claim 14, further comprising an outer spindle bearing mounted to the lock cage, wherein the spring-loaded trap is triggered by rotation of the outer spindle bearing relative to the lock cage. 16. The cylindrical lockset designed to thwart an overtorquing attack of claim 13, wherein the retractor assembly is constrained for translational movement along a longitudinal axis along which the latch retracts, the retractor assembly comprising an inner cam-activated retractor and an outer cam-activated retractor, the outer cam-activated retractor configured to press the inner cam-activated retractor to retract the latch. 17. The cylindrical lockset designed to thwart an overtorquing attack of claim 16, wherein the trap, when activated, disables the outer cam-activated retractor.
Nunez Paul (Fairfield CT) Sorensen David (Hamden CT) Slusarski Ronald S. (Narragansett RI) Alexander Arnon (North Haven CT) Haq Mohammed A. (Newington CT), Motorized lock actuators.
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