A clutch mechanism and a door lock having the same

Abstract

The present invention discloses a clutch mechanism and a door lock having the clutch mechanism, belonging to the technical field of door locks. The clutch mechanism includes a sliding assembly and a toggle assembly. The sliding assembly includes a guide groove plate and a slide plate. The guide groove plate is provided with an arc-shaped guide rail. The toggle assembly is provided with a thumbwheel. The toggle assembly is located on the inner side of the guide rail, and the rotation center of the thumbwheel does not coincide with the center of the arc on which the guide rail is located. The thumbwheel is rotated to toggle the slide plate to slide within the guide rail, and the thumbwheel assembly and the slide plate are releasably coupled. The clutch mechanism operates according to the principle of the progressive approach and separation of non-concentric circular arcs. The toggle assembly toggles the sliding assembly to slide within the guide rail and releases it at the appropriate time. This cleverly solves the linkage problem between the gear lock bolt and the oblique bolt, making the gear lock more stable in operation and more labor-saving to unlock. The clutch mechanism has great commercial value.

Description

Technical Field

[0001] The present invention relates to the technical field of door locks, and in particular to a clutch mechanism and a door lock having the clutch mechanism. Background Art

[0002] Currently, most door locks on the market are gear locks with complex internal structures. Their clutch function often relies on the coordination of multiple gears and other components. This complex clutch structure also means that the lock bolt and latch bolt can only be retracted simultaneously, which can easily lead to excessive unlocking force and the key breaking during the unlocking process. This structure also makes it difficult to retract the lock bolt, especially the thickest one around 3mm, which relies entirely on spring force. Some two-speed locks on the market are even more complex and have multiple stuck points during use. If the lock bolt becomes stuck at a stuck point, the lock cylinder cannot be opened and can only be forced open, causing damage to the lock.

[0003] Gear locks on the market essentially all use a clutch mechanism. Existing application number CN108757854A discloses a lock body clutch mechanism that achieves a clutch function by shifting a slider using a boss on a clutch shift block. This process requires independent vertical and horizontal operation of the clutch shift block and coordinated movement of the slider in a single plane: first, the clutch shift block must be pulled vertically to release the latch at its lower end; then, the clutch shift block is rotated to shift the slider to either the first or second position, after which the latch must be reengaged. Because this clutch function is achieved by positioning the slider in two positions using the latch on the clutch shift column and two notches at the bottom of the clutch through-hole, it lacks flexibility, is complex to operate, and is prone to disengagement.

[0004] In view of the many shortcomings of existing gear locks on the market, a clutch mechanism was developed to solve the following problems: 1. The clutch mechanism has a simple, stable and efficient structure; 2. The use of the clutch structure can optimize the components within the lock, and the recovery of the lock tongue and the inclined tongue can be independently controlled, reducing the occurrence of the key being unable to unlock due to internal structure jamming; 3. The use of the clutch structure reduces the torque of the lock core and prevents the key from breaking. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a clutch mechanism to address the shortcomings of the existing technology. The clutch mechanism utilizes the principle of non-concentric arcs gradually approaching and separating. The sliding component is toggled by the toggle component to slide in the guide groove and released at the right time, thereby cleverly realizing unlocking and locking by toggling the component. At the same time, the linkage between the gear lock bolt and the oblique bolt is also solved, making the gear lock run more stably and unlocking more labor-saving.

[0006] The present invention adopts the following technical solutions:

[0007] A clutch mechanism is provided, comprising a sliding assembly and a toggle assembly, wherein the sliding assembly comprises a guide groove plate and a slider, wherein the guide groove plate is provided with an arc-shaped guide rail; the toggle assembly is provided with a dial wheel, and the dial wheel is provided with a dial tooth; the toggle assembly is located on the inner side of the guide rail, and the rotation center of the dial wheel does not coincide with the center of the arc of the guide rail; when the dial wheel rotates, the dial tooth toggle the slider to slide within the guide rail, and the dial tooth and the slider are releasably coupled. When the dial wheel is rotated, the dial tooth engages with the slider; if the dial wheel is continued to be rotated, the dial tooth pushes the slider to slide, and when the slider slides to the end of the guide rail, the dial wheel is continued to be rotated to separate the dial tooth from the slider; when the dial wheel is rotated in the reverse direction to return to the position where the dial tooth and the slider were previously separated, the dial wheel is continued to be rotated, and the dial tooth and the slider can be reengaged, and if the dial wheel is continued to be rotated, the dial tooth pushes the slider to slide in the reverse direction.

[0008] Preferably, the thumbwheel can rotate 360°, the rotation center of the thumbwheel is 1-38 mm away from the center of the arc where the guide rail is located, and the length of the thumbwheel is smaller than the radius of the arc where the guide rail is located.

[0009] Preferably, the dial assembly is a lock core including a dial wheel, a raised portion on the dial wheel is a dial tooth, and the dial wheel can be driven to rotate by a key.

[0010] Preferably, the dial assembly is rotated manually using a key or by a motor-driven dial wheel.

[0011] Preferably, the guide rail is a guide groove with an arc of 160-200 degrees and a depth of 2-8 mm; the slider is provided with at least one limit column adapted to the guide groove, the limit column limits the slider to slide in the guide groove, and the limit column can rotate freely in the slider.

[0012] Preferably, the guide rail is a ridge rail with an arc of 160-200 degrees and a height of 2-8 mm; the slider is provided with a groove matching the ridge rail.

[0013] Preferably, a tooth groove is provided on the slider, and when the dial wheel rotates, the dial tooth moves the groove column of the tooth groove, so that the slider slides in the guide rail.

[0014] Preferably, the slider is an arc structure, and the middle part of the inner arc surface is concave to form a U-shaped tooth groove.

[0015] Preferably, the slider is an arc structure, and an arc-shaped gear is provided on the inner arc surface, with an arc of 120-260 degrees.

[0016] Preferably, the guide groove plate is made by stamping a stamping part.

[0017] Preferably, a door lock includes the clutch mechanism described above.

[0018] Preferably, the door lock further comprises a bottom shell, a lock tongue assembly, a tilted tongue assembly and an upper cover plate, wherein the clutch mechanism, the lock tongue assembly and the tilted tongue assembly are respectively installed in the bottom shell of the lock body and covered by the upper cover plate, characterized in that the lock tongue assembly comprises a lock tongue, a lock tongue push plate and a drag plate, the drag plate and the lock tongue push plate are rotatably connected through a push plate guide pin, and the clutch mechanism extends or retracts the lock tongue by pushing and pulling the drag plate;

[0019] Preferably, the latch bolt assembly includes a handle shift shaft, a handle shift fork, a shoulder pole, and a latch bolt. The latch bolt is normally extended by a compression spring. The handle shift shaft is fixedly connected to the bottom shell. The handle shift fork is rotatably connected to the handle shift shaft. The shoulder pole is slidably connected to the bolt push plate by a pin. The clutch mechanism shifts the shoulder pole to push the handle shift fork to rotate, thereby driving the latch bolt to retract.

[0020] Preferably, the door lock further comprises a transmission gear, and the drag plate is rotationally connected to the transmission gear via a transmission pin, and when the transmission gear rotates, the drag plate is driven to move, and the lock tongue is extended or retracted.

[0021] Preferably, when the lock tongue is retracted, the transmission gear is automatically locked.

[0022] Preferably, the door lock also includes a limiting component and a stabilizing component, the limiting component includes a limiting block, a limiting plate and a limiting torsion spring; the stabilizing component includes a shift shaft gear and a shift shaft tooth plate, the shift shaft gear, the limiting plate and the transmission gear are coaxially stacked and linked, the shift shaft gear is meshed with the gear of the shift shaft tooth plate, and the limiting block is fixed by limiting the limiting plate.

[0023] Preferably, the door lock also includes an auxiliary lock tongue assembly and a top and bottom rod, the top and bottom rod is fixed with an auxiliary lock tongue guide pin that cooperates with the oblique push-pull groove on the auxiliary lock tongue assembly, and the lock tongue push plate is provided with a top and bottom rod guide pin that cooperates with the oblique sliding groove of the top and bottom rod; the lock tongue assembly drives the top and bottom rod to move, and then drives the auxiliary lock tongue to extend or retract.

[0024] Working principle:

[0025] When the dial wheel rotates, since it rotates around its rotation center (axis), it is equivalent to the dial teeth making a circular motion. Since its center of circle does not coincide with the center of the arc-shaped guide rail, when the dial wheel rotates until the dial teeth are close to the arc-shaped guide rail, if the dial wheel continues to be rotated, the dial teeth will get closer and closer to the guide rail, and then farther and farther away. By using this principle, the clutch can be achieved by cleverly cooperating with the dial teeth and the slider, and the dial teeth can push the slider to slide in the guide rail.

[0026] The beneficial effect of the present invention is that, according to the principle of progressive approach and separation of non-concentric circular arcs, the sliding component is driven by the toggle component to slide in the guide rail and released at the right time, thereby simplifying the internal structure of the lock body, and very cleverly solving the unlocking and locking of the gear lock, as well as the linkage between the lock tongue and the oblique tongue, making the gear lock run more stably and unlocking more labor-saving, and having very great commercial value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Attachment Figure 1 1 is a schematic structural diagram of the clutch mechanism in state 1 according to an embodiment of the present invention; Figure 2 1 is a schematic structural diagram of the clutch mechanism in state 2 according to an embodiment of the present invention; Figure 3 Schematic diagram of the structure of the slider of the embodiment of the present invention (with arc gear); Figure 4 yes Figure 3 Bottom view of the middle slider; Figure 5 Schematic diagram of the guide plate structure according to an embodiment of the present invention; Figure 6 FIG1 is a schematic diagram of the door lock unlocking state according to an embodiment of the present invention; ... Figure 7 1 is a schematic diagram of the structure of the door lock in the locked state according to the embodiment of the present invention; Figure 8 Schematic diagram of the working structure of the clutch mechanism and the driving gear according to an embodiment of the present invention; Figure 9 1 is a schematic structural diagram of a lock tongue assembly according to an embodiment of the present invention; Figure 10 1 is an exploded view of a gear lock according to an embodiment of the present invention; in the accompanying drawings, 11 a lock bolt, 12 a lock bolt push plate, 13 a drag plate, 14 a push plate guide pin, 15 a guide pin for a top and bottom rod, 21 a tilted bolt, 22 a handle fork, 23 a shoulder pole, 24 a pin shaft, 25 a handle shaft, 31 a lock core, 311 a dial wheel, 312 a dial tooth, 313 a lock hole, 32 a guide groove plate, 321 a guide groove, 322 a pad, 33 a slider, 331 a circular arc rack, 332 a slot, 333 a limit column, 41 a transmission gear , 411 transmission pin, 51 auxiliary tongue, 52 auxiliary tongue panel, 521 panel slide, 522 panel guide pin, 53 auxiliary tongue pick, 531 pick pin hole, 532 oblique push-pull groove, 533 pick slide, 54 auxiliary tongue pin, 61 sky and earth rod, 611 auxiliary tongue guide pin, 612 sky and earth rod oblique slide, 71 limit shift block, 72 limit plate, 73 limit torsion spring, shift shaft gear, 75 shift shaft gear plate, 81 bottom shell, 82 upper cover. DETAILED DESCRIPTION

[0028] The following embodiments are provided in conjunction with the accompanying drawings to further illustrate the specific implementation of the present application. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other, and the present invention is not limited to the description of the following embodiments.

[0029] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "bottom", "top", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] Example 1

[0031] like Figure 1-5 As shown, embodiment 1 of the present invention provides a clutch mechanism, including a sliding assembly and a toggle assembly, the sliding assembly including a guide groove plate 32 and a slider 33, the guide groove plate 32 is provided with an arc-shaped guide groove 321, the curvature of the guide groove 321 is 160-200 degrees, and the depth of the guide groove 321 is 2-8 mm; the middle part of the inner arc of the slider 33 is concave to form a U-shaped tooth groove 332, and a circular arc gear 331 is fixed on the outer arc, with an curvature of 120-260 degrees; in this embodiment, the toggle assembly is a lock cylinder 31 with a dial wheel 311, and the protrusion on the dial wheel 311 is a dial Tooth 312, when the key rotates the lock cylinder 31, the thumbwheel 311 rotates, and the thumbwheel 312 and the tooth groove 332 of the slider can be released and engaged. After engagement, the thumbwheel 312 pushes the slider 33 to slide; the lock cylinder 31 is arranged on the inner side of the guide groove 321, that is, the part of the lock cylinder 31 close to the guide groove 321 is surrounded by the guide groove 321, and the rotation center (center) of the thumbwheel 311 does not coincide with the center of the arc where the guide groove 321 is located; as a preferred solution of this embodiment, the distance between the rotation center (center) of the thumbwheel 311 and the center of the arc where the guide groove 321 is located is 1-38 mm.

[0032] Specific implementation: When the lock core 31 is rotated, the teeth 312 on the dial wheel 311 of the lock core 31 will engage with the tooth groove 332 of the slider 33, and then the slider 33 is driven to slide in the guide groove 321; the teeth 312 and the slider 33 are releasably engaged, that is, when the slider 33 slides to the lower end along the guide groove 321, the engagement between the teeth 312 and the slider 33 is released ( Figure 1 ), continue to rotate the key clockwise, the slider 33 will not slide further. Turn the lock cylinder 31 counterclockwise (reverse direction), the tooth 312 and the slider 33 will engage at the lower end of the guide groove 321, continue to rotate the lock cylinder 31 counterclockwise, and the slider 33 will slide along the guide groove 321. When it slides to the upper end of the guide groove 321, the tooth 312 and the slider 33 are released ( Figure 2 ).

[0033] As a preferred solution of this embodiment, the slider is fixed with at least one limiting column 333 adapted to the guide groove 321 to limit the slider 33 from sliding in the guide groove 321 .

[0034] In addition, in this embodiment, a key with a dial wheel 311 is used to drive the lock cylinder 31 to move the slider 33 to slide in the guide groove 321. In actual applications, a motor can also be used to drive the dial wheel 311 to achieve the same function.

[0035] Example 2

[0036] like Figure 6-10 As shown, an embodiment of the present invention provides a door lock, including a bottom shell, a lock tongue assembly, a tilted tongue assembly, an auxiliary lock tongue assembly, a top and bottom rod, a clutch mechanism and an upper cover plate, wherein the lock tongue assembly, the tilted tongue assembly, the auxiliary lock tongue assembly, the top and bottom rod, and the clutch mechanism are respectively installed in the matching positions of the lock body bottom shell and covered by the upper cover plate, specifically: the lock tongue assembly includes a lock tongue 11, a lock tongue push plate 12 and a drag plate 13, the drag plate 13 is rotatably connected to the lock tongue push plate 12 through the push plate guide pin 14, the drag plate 13 is rotatably connected to the transmission gear 41 through the transmission pin 411, the clutch mechanism drives the transmission gear 41 to rotate through the arc-shaped rack 331, and pushes and pulls the drag plate 13 to extend or retract the lock tongue 11.

[0037] The inclined bolt assembly includes a handle shaft 25, an inclined bolt 21, a handle fork 22, and a shoulder pole 23. The inclined bolt 21 is normally extended by a compression spring. The handle shaft 25 is fixedly connected to the bottom shell 81. The handle fork 22 is rotatably connected to the handle shaft 25. The shoulder pole 23 is slidably connected to the lock bolt push plate 12 through a pin shaft 24. The clutch drive mechanism drives the shoulder pole 23 and then drives the handle fork 22 to rotate, thereby driving the inclined bolt 21 to retract.

[0038] The auxiliary tongue assembly includes an auxiliary tongue 51, an auxiliary tongue panel 52, and an auxiliary tongue pick 53. The auxiliary tongue panel 52 is fixedly provided with a panel slide 521 and a panel guide pin 522. The auxiliary tongue pick 53 is fixedly provided with a pick pin hole 531, an oblique push-pull groove 532, and a pick slide 533. The pick pin hole 531 and the panel slide 521 are movably connected via the auxiliary tongue pin shaft 54. The oblique push-pull groove 532 cooperates with the auxiliary tongue guide pin 611, and the pick slide 533 cooperates with the panel guide pin 522. The auxiliary tongue panel 52 is fixedly provided with a panel guide pin 522 that cooperates with the pick slide.

[0039] The top and bottom rods 61 are fixed with a sub-tongue guide pin 611 that cooperates with the oblique push-pull groove 532 on the sub-tongue paddle 53, and the lock tongue push plate 12 is provided with a top and bottom rod guide pin 15 that cooperates with the oblique sliding groove 612 of the top and bottom rod. When the lock tongue push plate 12 moves, it pushes the top and bottom rod 61 to slide left and right, thereby driving the sub-tongue 51 to extend and retract synchronously.

[0040] The clutch mechanism includes a lock core 31, a guide groove plate 32 and a slider 33. In this embodiment, the lock core 31 is used as the dial wheel in this application. The bottom shell and the upper cover of the lock body are both provided with lock holes that match the lock core. In actual use, other dial wheels can also be used, such as motor-driven dial wheels. As long as they include dial teeth that can rotate freely around the center, the functions of this application can be achieved; the guide groove plate 32 is on the periphery of the lock core 31 and is riveted to the bottom shell 81 and the upper cover 82 respectively. In this embodiment, two guide groove plates 32 are used. The guide groove plates 32 are made by stamping. A circular arc guide groove 321 is fixed on the guide groove plate 32. The guide groove plate 32 is riveted to the bottom shell and the upper cover through a pad 322. The slider 33 is fixed with an arc-shaped rack 331 on the outside, with an arc of 120-260 degrees, preferably 160 degrees, and the arc-shaped rack 331 is engaged with the transmission gear 41; a U-shaped slot 38 is provided on the inside of the slider, and when the dial wheel 3 rotates, the shifting tooth 312 shifts the side wall of the slot 38, so that the slider 33 slides in the guide groove 321; the slider is also provided with two limiting posts 333 adapted to the guide groove 321, and the limiting posts 333 limit the sliding of the slider 33 in the guide groove 321, and the limiting posts 333 can rotate freely in the slider 33. The rotation center of the lock cylinder 31, that is, the center of the circle formed by the rotation of the shift tooth 312, does not coincide with the center of the arc of the guide groove 321. This ensures that the shift tooth 312 and the slider 33 are releasably engaged. That is, the shift tooth 312 of the lock cylinder 31 is engaged when it rotates within the arc of the guide groove 321 and is released when it rotates out of this angle. At this time, the shift tooth 312 is disengaged from the slot 38 of the slider 33.

[0041] When the gear lock of this embodiment is in use:

[0042] If the lock is closed ( Figure 2 ), the key rotates clockwise, driving the dial wheel 3 to rotate. When it rotates upward, the shifting tooth 312 engages with the slot 38 of the slider 33. Continued rotation causes the shifting tooth 312 to move the slider 33 along the guide slot 321. The arc-shaped rack 331 of the slider 33 drives the transmission gear 41 to rotate, which in turn drives the drag plate 13 downward, causing the lock bolt 11 to retract. At this point, the key is further rotated, and the shifting tooth 312 disengages from the slot 38 of the slider 33. When it continues to rotate upward, the shifting tooth 312 engages with the shoulder pole 23. The shifting tooth 312 shifts the shoulder pole 23 to slide rightward, which in turn pushes the handle fork 22 to rotate, thereby retracting the oblique bolt 21. Because the top and bottom rods 61 are fixedly provided with an auxiliary bolt guide pin 611 that mates with the oblique push-pull groove 532 on the auxiliary bolt assembly, and the lock bolt push plate 12 is provided with a top and bottom rod guide pin 15 that mates with the oblique slide groove 612 of the top and bottom rod, the lock bolt 11 and auxiliary bolt 51 can be retracted synchronously.

[0043] If the lock is open ( Figure 1), the key rotates counterclockwise, driving the dial wheel 3 to rotate, and when it rotates to the bottom, the tooth 312 engages with the slot 38 of the slider 33. Continuing to rotate, the tooth 312 will drive the slider 33 to slide along the guide groove 321, and the arc-shaped rack 331 of the slider 33 drives the transmission gear 41 to rotate, thereby driving the drag plate 13 to move upward, and the lock tongue 11 extends. At this time, the transmission gear 41 can automatically lock into place. Specifically, a protruding structure is fixedly provided in the toothless area on the opposite side of the transmission gear 41, which can be engaged with the limit stop column next to it when locked. Since the top and bottom rod 5 is fixed with an auxiliary tongue guide pin 611 that cooperates with the oblique push-pull groove 532 on the auxiliary tongue assembly, the lock tongue push plate 12 is provided with a top and bottom rod guide pin 15 that cooperates with the oblique slide groove 612 of the top and bottom rod, so that the lock tongue and the auxiliary tongue can be extended synchronously.

[0044] The lock bolt 11 and the latch bolt 21 extend or retract independently of each other through the clutch mechanism. That is, when the lock bolt 11 is opened or closed, the latch bolt 21 does not move with it. Since the latch bolt 21 is normally extended, when the latch bolt 21 retracts or is released from retraction, the lock bolt 11 does not move with it either. They move independently.

[0045] As a preferred embodiment of the present invention, in order to make the lock run more smoothly, a limiting component and a stabilizing component are also provided. The limiting component includes a limiting shift block 71, a limiting plate and a limiting torsion spring; the stabilizing component includes a shift shaft gear and a shift shaft tooth plate. The shift shaft gear, the limiting plate and the transmission gear are coaxially stacked and linked. The shift shaft gear is meshed with the gear of the shift shaft tooth plate, and the limiting shift block is fixed by limiting the limiting plate.

[0046] As a preferred solution of this embodiment, the curvature of the guide groove is 160-200 degrees, and the depth of the guide groove is 2-8 mm;

[0047] As a preferred solution of this embodiment, the rotation center of the thumbwheel is 1-38 mm away from the center of the arc where the guide groove is located.

[0048] Example 3

[0049] In this embodiment, a ridge rail is fixed on the guide groove plate, and the curvature of the ridge rail is 160-200 degrees; a groove matching the ridge rail is provided on the slider, and other components and installation and connection methods are the same as those in Example 2.

[0050] The embodiment of the present application provides a gear lock with a lock tongue, a tilted lock tongue, an auxiliary lock tongue, and a top and bottom rod. In practical applications, a gear lock without the auxiliary lock tongue and the top and bottom rod can be made according to actual needs and installed and used on an interior door.

[0051] In addition, in this embodiment, a key with a dial wheel is used to drive the lock cylinder to move the slider to unlock or lock. In actual applications, a motor can also be used to drive the dial wheel to unlock or lock.

[0052] Preferably, a door lock including any of the above-mentioned clutch mechanisms further comprises a bolt assembly, a latch bolt assembly, and a drive mechanism. A thumbwheel is used to move a slider, causing the slider's arc-shaped gear to mesh with a gear of the drive assembly, thereby opening or closing the bolt. After the thumbwheel is rotated to open the bolt, it continues to rotate, separating from the slider. When the thumbwheel is rotated to a certain degree, the latch bolt assembly is moved to open the latch bolt.

[0053] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A door lock, comprising a clutch mechanism, a bottom shell, a lock tongue assembly, a latch tongue assembly and an upper cover plate, wherein the clutch mechanism, the lock tongue assembly and the latch tongue assembly are respectively installed in the bottom shell of the lock body and covered by the upper cover plate, characterized in that: The clutch mechanism includes a sliding assembly and a toggle assembly, the sliding assembly including a guide groove plate and a slider, the guide groove plate is provided with an arc-shaped guide rail, the slider is an arc structure, and the middle part of the inner arc surface is concave to form a U-shaped tooth groove; the toggle assembly is provided with a dial wheel, and the dial wheel is provided with a dial tooth; the toggle assembly is located on the inner side of the guide rail, and the rotation center of the dial wheel does not coincide with the center of the arc on which the guide rail is located; when the dial wheel rotates, the dial tooth toggle the slider to slide in the guide rail, and the dial tooth and the slider are releasably combined; The lock tongue assembly includes a lock tongue, a lock tongue push plate and a drag plate. The drag plate and the lock tongue push plate are rotatably connected through a push plate guide pin. The clutch mechanism extends or retracts the lock tongue by pushing and pulling the drag plate. The inclined bolt assembly includes a handle shift shaft, a handle shift fork, a shoulder pole, and an inclined bolt. The inclined bolt is normally extended by a compression spring. The handle shift shaft is fixedly connected to the bottom shell. The handle shift fork is rotatably connected to the handle shift shaft. The shoulder pole is slidably connected to the lock bolt push plate through a pin shaft. The clutch mechanism shifts the shoulder pole to push the handle shift fork to rotate, thereby driving the inclined bolt to retract.

2. A door lock according to claim 1, characterized in that: It also includes a transmission gear, and the drag plate is rotatably connected to the transmission gear through a transmission pin. When the transmission gear rotates, the drag plate is driven to move, and the lock tongue is extended or retracted.

3. A door lock according to claim 2, characterized in that: When the lock tongue is retracted, the transmission gear is automatically locked.

4. A door lock according to claim 2, characterized in that: It also includes a limiting component and a stabilizing component, the limiting component includes a limiting block, a limiting plate and a limiting torsion spring; the stabilizing component includes a shift shaft gear and a shift shaft tooth plate, the shift shaft gear, the limiting plate and the transmission gear are coaxially stacked and linked, the shift shaft gear is meshed with the gear of the shift shaft tooth plate, and the limiting block is fixed by limiting the limiting plate.

5. The door lock according to any one of claims 1 to 4, characterized in that: It also includes an auxiliary lock tongue assembly and a top and bottom rod, wherein the top and bottom rod is fixed with an auxiliary lock tongue guide pin that matches the oblique push-pull groove on the auxiliary lock tongue assembly, and the lock tongue push plate is provided with a top and bottom rod guide pin that matches the oblique slide groove of the top and bottom rod; The lock tongue assembly drives the top and bottom rods to move, thereby driving the auxiliary lock tongue to extend or retract.

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