# US 12,180,748 B2 · Electronic door lock and transmission mechanism thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,180,748 B2 - Document ID: US12180748B2 - Status: Granted - Kind: B2 - Application number: 18/109,173 - Filed: 2023-02-13 - Published: 2024-06-06 - Granted: 2024-12-31 - Earliest claimed: 2022-12-02 - Assignees: Primax Electronics Ltd. - Applicants: Primax Electronics Ltd. - Inventors: Li-Chun Wang; Meng-Chieh Liu - Web page: https://patentgrep.com/patent/US12180748B2 ## CPC - E05B 47/0012: {with rotary electromotors (actuators with rotary electromotors per se H02K7/06, H02K23/68)} - E05B 47/026: {the bolt moving rectilinearly} - E05B 2047/0017: {with rotary motion} - E05B 2047/002: {Geared transmissions} - E05B 2047/0026: {Clutches, couplings or braking arrangements} - E05B 2047/0036: {Reversible actuators} - E05B 2047/0058: {by batteries} - E05B 2047/0067: {Monitoring} - E05B 2047/0069: {bolt position} - E05B 2047/0091: {Retrofittable electric locks, e.g. an electric module can be attached to an existing manual lock} - E05B: LOCKS; ACCESSORIES THEREFOR; HANDCUFFS ## Abstract A transmission mechanism for an electronic door lock is provided. The transmission mechanism includes a gear box, a motor module, a transmission gear set, a transmission rod, a clutch transmission module and a motion detection circuit board. A returning detection module is installed on the motion detection circuit board. The returning detection module is used to detect the actuation state of the clutch transmission module. ## Claims ### Claim 1 An electronic door lock installed on a door panel, the electronic door lock comprising: a first lock body comprises a pedestal member and a covering member; a transmission mechanism installed on the first lock body, and comprising: a gear box comprising a lower cover and an upper cover, which are combined with each other, wherein the lower cover comprises a first opening and at least one or more detection holes, and the upper cover comprises a second opening corresponding to the first opening; a motor module installed on the lower cover; a transmission gear set pivotally coupled with the lower cover and engaged with the motor module; a transmission rod, wherein a first end and a second end of the transmission rod are respectively penetrated through the first opening and the second opening; a clutch transmission module comprising a clutch gear, a connection element and two stopping elements, wherein the clutch gear has a first surface and a second surface opposite to the first surface, wherein a concave structure is formed in the first surface, two push blocks are disposed within the concave structure, arranged along a same rotation path and opposed to each other, a first pivotal hole runs through a middle region of the concave structure, and two sensing points are formed on the second surface, arranged along a same rotation path and opposed to each other, wherein the transmission rod is penetrated through the first axial hole, so that the clutch gear is pivotally coupled with the transmission rod and engaged with the transmission gear set, wherein the connection element is rotatably embedded within the concave structure, and the connection element and the transmission rod are connected with each other, so that the connection element is linked with the transmission rod, wherein the two stopping elements are installed on two opposite sides of the connection element, and the two stopping elements comprise two stopping parts corresponding to the two push blocks, respectively; and a motion detection circuit board electrically connected with the motor module and installed on a lateral side of the lower cover away from the upper cover, wherein the motion detection circuit board has a third surface and a fourth surface opposite to the third surface, wherein a returning detection module is installed on the third surface, the returning detection module is installed in the at least one or more detection holes, the returning detection module comprises a first returning detection unit and a second returning detection unit, and the first returning detection unit and the second returning detection unit are aligned with a rotation path of the two sensing points; and a latch assembly comprising a latch mandrel, a latch bolt and a torque blade, wherein the latch bolt is received within the latch mandrel, the torque blade is penetrated through the latch mandrel, the torque blade is connected with the first end of the transmission rod, and the latch bolt is selectively protruded out or retracted back through the torque blade, wherein while the motor module drives a rotation of the clutch gear through the transmission gear set, the two push blocks are rotated to push the stopping parts of the corresponding stopping elements, and the transmission rod is correspondingly rotated, wherein while the transmission rod is rotated, the torque blade is correspondingly rotated, and the latch bolt is correspondingly protruded out of the latch mandrel, wherein after the latch bolt is protruded to a locking position, the motor module drives a reverse rotation of the clutch gear, and the two push blocks are detached from the corresponding stopping elements, wherein when the motion detection circuit board detects that one of the two sensing points is transferred across at least one of the first returning detection unit and the second returning detection unit, the reverse rotation of the clutch gear is stopped, and a returning process is completed. ### Claim 2 (depends on 1) The electronic door lock according to claim 1, wherein the first end of the transmission rod comprises a transmission body, and two protruded edges are formed on two opposite sides of the transmission body along a radial direction of the transmission rod. ### Claim 3 (depends on 2) The electronic door lock according to claim 2, wherein the electronic door lock further comprises a locking detection module, wherein the locking detection module is installed on the fourth surface of the motion detection circuit board, and the locking detection module comprises a first locking detection unit and a second locking detection unit corresponding to the two protruded edges. ### Claim 4 (depends on 3) The electronic door lock according to claim 3, wherein when the latch bolt is completely received within the latch mandrel, the second locking detection unit is pressed by a first protruded edge of the two protruded edges. ### Claim 5 (depends on 4) The electronic door lock according to claim 4, wherein while the latch bolt is protruded to the locking position, the first protruded edge is detached from the second locking detection unit, and a second protruded edge of the two protruded edges is correspondingly moved and then contacted with the first locking detection unit. ### Claim 6 (depends on 4) The electronic door lock according to claim 4, wherein while the latch bolt is protruded to the locking position, the first protruded edge is detached from the second locking detection unit and then contacted with the first locking detection unit. ### Claim 7 (depends on 3) The electronic door lock according to claim 3, wherein the locking detection module is a micro switch module. ### Claim 8 (depends on 1) The electronic door lock according to claim 1, wherein the returning detection module is a light detection module, and the two sensing points are light reflection points. ### Claim 9 (depends on 1) The electronic door lock according to claim 1, wherein the returning detection module is a Hall magnetic sensor module, and the two sensing points are magnetic elements. ### Claim 10 (depends on 1) The electronic door lock according to claim 1, wherein a polygonal coupling recess is formed in a surface of the connection element facing the clutch gear. ### Claim 11 (depends on 10) The electronic door lock according to claim 10, wherein the transmission rod further comprises a polygonal coupling block corresponding to the polygonal coupling recess, and the polygonal coupling block is protruded along a radial direction of the transmission rod, wherein the polygonal coupling block and the polygonal coupling recess are coupled with each other, so that the connection element is linked with the transmission rod. ### Claim 12 (depends on 10) The electronic door lock according to claim 10, wherein the connection element comprises a second axial hole, and the second axial hole is coaxial with the polygonal coupling recess. ### Claim 13 (depends on 12) The electronic door lock according to claim 12, wherein the electronic door lock further comprises an operation element, and the covering member comprises a mounting hole, wherein the operation element is installed in the mounting hole. ### Claim 14 (depends on 13) The electronic door lock according to claim 13, wherein the second end of the transmission rod is connected with the operation element through the mounting hole. ### Claim 15 (depends on 14) The electronic door lock according to claim 14, wherein the second end of the transmission rod comprises a fixing segment, and the operation element comprises a knob structure and a shaft part, wherein the shaft part is connected with the knob structure, the shaft part is installed in the mounting hole, and the shaft part is connected with the fixing segment. ### Claim 16 (depends on 1) The electronic door lock according to claim 1, wherein the motor module comprises a motor body and a worm screw, wherein the worm screw is connected with the motor body. ### Claim 17 (depends on 16) The electronic door lock according to claim 16, wherein the transmission gear set comprises a first composite gear and a second composite gear, wherein the first composite gear comprises a first large-diameter tooth part and a first small-diameter tooth part, and the first large-diameter tooth part and the first small-diameter tooth part are coaxial with each other, wherein the second composite gear comprises a second large-diameter tooth part and a second small-diameter tooth part, and the second large-diameter tooth part and the second small-diameter tooth part are coaxial with each other. ### Claim 18 (depends on 17) The electronic door lock according to claim 17, wherein the first small-diameter tooth part of the first composite gear and the clutch gear are engaged with each other, the first large-diameter tooth part of the first composite gear and the second small-diameter tooth part of the second composite gear are engaged with each other, and the second large-diameter tooth part of the second composite gear and the worm screw of the motor module are engaged with each other. ### Claim 19 (depends on 1) The electronic door lock according to claim 1, wherein the each of the two stopping elements is made of a material with rigidity and elasticity. ### Claim 20 A transmission mechanism for an electronic door lock, the transmission mechanism comprising: a gear box comprising a lower cover and an upper cover, which are combined with each other, wherein the lower cover comprises a first opening and at least one or more detection holes, and the upper cover comprises a second opening corresponding to the first opening; a motor module installed on the lower cover; a transmission gear set pivotally coupled with the lower cover and engaged with the motor module; a transmission rod, wherein a first end and a second end of the transmission rod are respectively penetrated through the first opening and the second opening; a clutch transmission module comprising a clutch gear, a connection element and two stopping elements, wherein the clutch gear has a first surface and a second surface opposite to the first surface, wherein a concave structure is formed in the first surface, two push blocks are disposed within the concave structure, arranged along a same rotation path and opposed to each other, a first pivotal hole runs through a middle region of the concave structure, and two sensing points are formed on the second surface, arranged along a same rotation path and opposed to each other, wherein the transmission rod is penetrated through the first axial hole, so that the clutch gear is pivotally coupled with the transmission rod and engaged with the transmission gear set, wherein the connection element is rotatably embedded within the concave structure, and the connection element and the transmission rod are connected with each other, so that the connection element is linked with the transmission rod, wherein the two stopping elements are installed on two opposite sides of the connection element, and the two stopping elements comprise two stopping parts corresponding to the two push blocks, respectively; and a motion detection circuit board electrically connected with the motor module and installed on a lateral side of the lower cover away from the upper cover, wherein the motion detection circuit board has a third surface and a fourth surface opposite to the third surface, wherein a returning detection module is installed on the third surface, the returning detection module is installed in the at least one or more detection holes, the returning detection module comprises a first returning detection unit and a second returning detection unit, and the first returning detection unit and the second returning detection unit are aligned with a rotation path of the two sensing points. ### Claim 21 (depends on 20) The transmission mechanism according to claim 20, wherein the first end of the transmission rod comprises a transmission body, and two protruded edges are formed on two opposite sides of the transmission body along a radial direction of the transmission rod. ### Claim 22 (depends on 21) The transmission mechanism according to claim 21, wherein the transmission mechanism further comprises a locking detection module, wherein the locking detection module is installed on the fourth surface of the motion detection circuit board, and the locking detection module comprises a first locking detection unit and a second locking detection unit, wherein the first locking detection unit and the second locking detection unit correspond to the two protruded edges, and the first locking detection unit or the second locking detection unit is permitted to be pressed by one of the two protruded edges. ### Claim 23 (depends on 22) The transmission mechanism according to claim 22, wherein the locking detection module is a micro switch module. ### Claim 24 (depends on 20) The transmission mechanism according to claim 20, wherein the returning detection module is a light detection module, and the two sensing points are light reflection points. ### Claim 25 (depends on 20) The transmission mechanism according to claim 20, wherein the returning detection module is a Hall magnetic sensor module, and the two sensing points are magnetic elements. ### Claim 26 (depends on 20) The transmission mechanism according to claim 20, wherein a polygonal coupling recess is formed in a surface of the connection element facing the clutch gear. ### Claim 27 (depends on 26) The transmission mechanism according to claim 26, wherein the transmission rod further comprises a polygonal coupling block corresponding to the polygonal coupling recess, and the polygonal coupling block is protruded along a radial direction of the transmission rod, wherein the polygonal coupling block and the polygonal coupling recess are coupled with each other, so that the connection element is linked with the transmission rod. ### Claim 28 (depends on 26) The transmission mechanism according to claim 26, wherein the connection element comprises a second axial hole, and the second axial hole is coaxial with the polygonal coupling recess. ### Claim 29 (depends on 20) The transmission mechanism according to claim 20, wherein the motor module comprises a motor body and a worm screw, wherein the worm screw is connected with the motor body. ### Claim 30 (depends on 29) The transmission mechanism according to claim 29, wherein the transmission gear set comprises a first composite gear and a second composite gear, wherein the first composite gear comprises a first large-diameter tooth part and a first small-diameter tooth part, and the first large-diameter tooth part and the first small-diameter tooth part are coaxial with each other, wherein the second composite gear comprises a second large-diameter tooth part and a second small-diameter tooth part, and the second large-diameter tooth part and the second small-diameter tooth part are coaxial with each other. ### Claim 31 (depends on 30) The transmission mechanism according to claim 30, wherein the first small-diameter tooth part of the first composite gear and the clutch gear are engaged with each other, the first large-diameter tooth part of the first composite gear and the second small-diameter tooth part of the second composite gear are engaged with each other, and the second large-diameter tooth part of the second composite gear and the worm screw of the motor module are engaged with each other. ### Claim 32 (depends on 20) The transmission mechanism according to claim 20, wherein the each of the two stopping elements is made of a material with rigidity and elasticity.