# US 12,006,735 B2 · Universal dogging and electronic latch retraction > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,006,735 B2 - Document ID: US12006735B2 - Status: Granted - Kind: B2 - Application number: 17/422,963 - Filed: 2020-01-28 - Published: 2022-05-12 - Granted: 2024-06-11 - Earliest claimed: 2019-01-28 - Assignees: Sargent Manufacturing Company - Applicants: Sargent Manufacturing Company - Inventors: Victor Bogdanov; Liza Alcala Escobar; Darren C. Eller - Web page: https://patentgrep.com/patent/US12006735B2 ## CPC - E05B 65/1093: {Dogging means for holding the actuation means, e.g. the actuating handle} - E05B 65/1053: {sliding towards and away form the door} - E05B 65/1073: {the pivot axis being substantially pependicular to the longitudinal axis of the bar} - E05B 47/0012: {with rotary electromotors (actuators with rotary electromotors per se H02K7/06, H02K23/68)} - E05B: LOCKS; ACCESSORIES THEREFOR; HANDCUFFS ## Abstract A dogging mechanism for an exit device may include a progressive latching arrangement to allow for dogging at a plurality of positions of a push bar. An electronic latch retraction device may include a camming arrangement configured to provide mechanical advantage when retracting a push bar of an exit device. ## Claims ### Claim 1 A dogging mechanism for an exit device, the exit device including a push bar configured to move between an extended position and a retracted position, the dogging mechanism comprising: a progressive blocking element including a plurality of locking regions; a catch configured to engage at least one of the plurality of locking regions, wherein when the catch is engaged with at least one of the plurality of locking regions the progressive blocking element blocks motion of the push bar from the retracted position toward the extended position, and wherein when the catch is disengaged with the plurality of locking regions the progressive blocking element is configured to allow motion of the push bar from the retracted position toward the extended position; and a camming element configured to rotate between a first camming position and a second camming position, wherein when the camming element is in the first camming position the catch is engaged with at least one of the plurality of locking regions, and wherein when the camming element is in the second camming position the catch is disengaged with the plurality of locking regions, wherein the camming element is configured to rotate about an axis transverse to a direction of travel of the push bar. ### Claim 2 (depends on 1) The dogging mechanism of claim 1, wherein the progressive blocking element is configured to allow motion of the push bar from the extended position toward the retracted position. ### Claim 3 (depends on 2) The dogging mechanism of claim 2, wherein the catch is configured to progressively engage the plurality of locking regions as the push bar moves from the extended position toward the retracted position. ### Claim 4 (depends on 1) The dogging mechanism of claim 1, wherein the progressive blocking element is configured as a linear ratchet. ### Claim 5 (depends on 1) The dogging mechanism of claim 1, wherein the progressive blocking element is configured as an arcuate ratchet. ### Claim 6 (depends on 1) The dogging mechanism of claim 1, further comprising an actuator configured to disengage the catch from the plurality of locking regions. ### Claim 7 (depends on 6) The dogging mechanism of claim 6, further comprising a catch biasing element, wherein the catch is biased to engage the progressive blocking element. ### Claim 8 A dogging mechanism for an exit device, the exit device including a push bar configured to move between an extended position and a retracted position, the dogging mechanism comprising: a blocking element configured to move between a first blocking position and a second unblocking position, wherein the blocking element is configured to block motion of the push bar from the retracted position toward the extended position when the blocking element is in the first position, and wherein the blocking element is configured to allow motion of the push bar from the retracted position toward the extended position; a ratchet and pawl configured to prevent movement of the blocking element towards the second unblocking position, wherein the ratchet includes a plurality of locking regions configured to prevent movement of the blocking element in a plurality of locking positions; an actuator configured to move the blocking element from the first blocking position to the second unblocking position; and a camming element configured to rotate between a first camming position and a second camming position, wherein the motion of the blocking element is controlled by the camming element, and wherein the camming element is configured to rotate about an axis transverse to a direction of travel of the push bar. ### Claim 9 (depends on 8) The dogging mechanism of claim 8, wherein the blocking element is configured to allow motion of the push bar from the extended position toward the retracted position. ### Claim 10 (depends on 9) The dogging mechanism of claim 9, wherein the pawl is configured to progressively engage the plurality of locking regions as the push bar moves from the extended position toward the retracted position. ### Claim 11 (depends on 8) The dogging mechanism of claim 8, wherein the ratchet is configured as a linear ratchet. ### Claim 12 (depends on 8) The dogging mechanism of claim 8, wherein the ratchet is configured as an arcuate ratchet. ### Claim 13 (depends on 8) The dogging mechanism of claim 8, wherein the actuator is configured to release the pawl from the ratchet. ### Claim 14 (depends on 13) The dogging mechanism of claim 13, further comprising a pawl biasing element, wherein the pawl is biased toward the ratchet. ### Claim 15 (depends on 8) The dogging mechanism of claim 8, further comprising a biasing member configured to bias the blocking member toward the second unblocking position. ### Claim 16 (depends on 15) The dogging mechanism of claim 15, wherein the ratchet and pawl are configured to resist a biasing force generated by the biasing member. ### Claim 17 (depends on 8) The dogging mechanism of claim 8, wherein the actuator is configured as one selected from the group of a hex key and linear actuator. ### Claim 18 (depends on 17) The dogging mechanism of claim 17, wherein the actuator is configured as a hex key, wherein the hex key is configured to move the blocking element between the first blocking position and the second unblocking position. ### Claim 19 (depends on 8) The dogging mechanism of claim 8, wherein the actuator includes both a hex key and a linear actuator, wherein the hex key and linear actuator are independently actuable to move the blocking element from the first blocking position to the second unblocking position. ### Claim 20 A dogging mechanism for an exit device, the exit device including a push bar configured to move between an extended position and a retracted position, the dogging mechanism comprising: a progressive blocking element including a plurality of locking regions, wherein the progressive blocking element is configured as an arcuate ratchet; and a catch configured to engage at least one of the plurality of locking regions, wherein when the catch is engaged with at least one of the plurality of locking regions the progressive blocking element blocks motion of the push bar from the retracted position toward the extended position, and wherein when the catch is disengaged with the plurality of locking regions the progressive blocking element is configured to allow motion of the push bar from the retracted position toward the extended position. ### Claim 21 A dogging mechanism for an exit device, the exit device including a push bar configured to move between an extended position and a retracted position, the dogging mechanism comprising: a blocking element configured to move between a first blocking position and a second unblocking position, wherein the blocking element is configured to block motion of the push bar from the retracted position toward the extended position when the blocking element is in the second position, and wherein the blocking element is configured to allow motion of the push bar from the retracted position toward the extended position; a ratchet and pawl configured to prevent movement of the blocking element towards the second unblocking position, wherein the ratchet includes a plurality of locking regions configured to prevent movement of the blocking element in a plurality of locking positions, and wherein the ratchet is configured as an arcuate ratchet; and an actuator configured to move the blocking element from the first blocking position to the second unblocking position.