# US 2014/0196509 A1 · Attack-Thwarting Cylindrical Lockset > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0196509 A1 - Document ID: US20140196509A1 - Status: Published application - Kind: A1 - Application number: 13/742,128 - Filed: 2013-01-15 - Published: 2014-07-17 - Earliest claimed: 2013-01-15 - Assignees: Townsteel, Inc. - Applicants: Townsteel, Inc. - Inventors: Charles W. Moon; Michael J. Wright - Web page: https://patentgrep.com/patent/US20140196509A1 ## CPC - E05B 63/16: with the handles on opposite sides moving independently - E05B 17/2092: {Means responsive to tampering or attack providing additional locking (for safes E05B65/0082)} - E05B 55/005: {Cylindrical or tubular locks} - E05C 1/163: {Cylindrical or tubular latches} - Y10T 70/20: Attack-actuated defeating mechanisms - E05B: LOCKS; ACCESSORIES THEREFOR; HANDCUFFS - E05C: BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS (latching means for sideboard or tailgate structures for vehicles B62D, {B62D33/02}; fastening devices for constructional or engineering elements E04, F16B; locks, fastening devices structurally or operatively combined or having significant cooperation with locks E05B; means for operating or controlling wing fasteners in conjunction with mechanisms for moving the wing E05F) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract 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. ## Claims ### Claim 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; and a 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 3) 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 a retractor assembly from translating into a latch-retracting position. ### Claim 5 (depends on 4) 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. ### Claim 6 (depends on 5) 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; and when 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. ### Claim 7 (depends on 1) 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. ### Claim 8 (depends on 7) 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. ### Claim 9 (depends on 1) 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. ### Claim 10 (depends on 9) 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. ### Claim 11 (depends on 1) 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. ### Claim 12 (depends on 11) 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. ### Claim 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; and a 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. ### Claim 14 (depends on 13) The cylindrical lockset designed to thwart an overtorquing attack of claim 13, wherein the trap is spring-loaded. ### Claim 15 (depends on 14) 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. ### Claim 16 (depends on 13) The cylindrical lockset designed to thwart an overtorquing attack of claim 13, wherein the refractor 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. ### Claim 17 (depends on 16) The cylindrical lockset designed to thwart an overtorquing attack of claim 16, wherein the trap, when activated, disables the outer cam-activated retractor. ### Claim 18 A cylindrical lockset comprising: inner and outer spindles configured to receive inside and outside door handles; a latch; a latchbolt assembly; 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 mounted in the lock cage and constrained for translational movement along a longitudinal axis of the latchbolt assembly, 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. ### Claim 19 (depends on 18) The cylindrical lockset of claim 18, wherein the inner cam-activated retractor has a cam engaging surface to convert rotary motion from the inside door handle into linear latch-retracting motion. ### Claim 20 (depends on 18) The cylindrical lockset of claim 18, wherein the outer cam-activated retractor has a cam engaging surface to convert rotary motion from the outside door handle into linear latch-retracting motion.