Counter locking device and door lock

Abstract

The utility model discloses a back locking device and a door lock, the back locking device comprises a knob, a square shaft, a lock seat and a transmission assembly, and the square shaft is used for being connected with a spring bolt in a lock body; the lock seat is provided with a containing space, a mounting hole and a through hole, the mounting hole and the through hole are communicated with the containing space, the knob is mounted on the mounting hole from the outer side of the lock seat, and the square shaft is located outside the containing space and close to the through hole. The transmission assembly comprises a first gear and a second gear, the first gear is located in the containing space, the first gear is connected with the rotary knob and can rotate along with the rotary knob, one end of the second gear is located in the containing space and rotationally installed on the lock seat, the other end of the second gear penetrates through the through hole and then is fixedly connected with the square shaft, and the second gear is connected with the first gear in an engaged mode. When the rotary knob is rotated, the rotary knob can drive the square shaft to rotate forwards or backwards through the transmission assembly, a traditional clamp spring is replaced by the first gear, a clamp spring clamp is not needed in the installation process, installation is convenient and fast, the tolerance gap between the rotary knob and the inner wall of the installation hole can be smaller, and the clamping stagnation phenomenon is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of door lock structures, in particular to an anti-locking device and a door lock. Background Art

[0002] At present, smart door locks, as a smart home product, are favored by more and more consumers because of their greater intelligence and simplicity in terms of security, identification, and management.

[0003] However, the anti-locking knobs designed in the existing industry are all raised structures, which are mainly fixed to the mounting holes of the middle frame by retaining rings. Retaining ring pliers are required during the installation process, which is very inconvenient. In addition, this structural design requires a large tolerance, which will result in a large gap between the anti-locking knob and the mounting hole after being fixed. If the gap is too small, the anti-locking knob will get stuck during rotation, resulting in a poor user experience. Utility Model Content

[0004] The purpose of the utility model is to provide an anti-locking device and a door lock to solve the technical problem that the existing anti-locking knobs are all raised structures and are mainly fixed to the mounting holes of the middle frame by means of retaining springs. Retaining spring pliers are needed during the installation process, which is very inconvenient. In addition, this structural design requires a large tolerance, which will result in a large gap between the anti-locking knob and the mounting hole after being fixed. If the gap is too small, the anti-locking knob will get stuck during rotation.

[0005] The utility model provides an anti-locking device, comprising:

[0006] knob;

[0007] The square shaft is used to connect with the lock tongue in the lock body;

[0008] A lock base is provided with an accommodating space, and a mounting hole and a through hole communicating with the accommodating space, the knob is mounted on the mounting hole from the outside of the lock base, and the square shaft is located outside the accommodating space and close to the through hole;

[0009] The transmission assembly includes a first gear and a second gear. The first gear is located in the accommodating space. The first gear is connected to the knob and can rotate with the knob. One end of the second gear is located in the accommodating space and is rotatably mounted on the lock seat, and the other end is fixedly connected to the square shaft after passing through the through hole. The second gear is meshed with the first gear. When the knob is rotated, the knob can drive the square shaft to rotate forward or reverse through the transmission assembly.

[0010] Furthermore, the lock seat includes a middle frame and a bottom plate, the middle frame includes a supporting plate, a protrusion, a stud and two side plates, the two side plates are respectively protruded from the two side ends of the supporting plate, the two ends of the bottom plate are respectively connected to the two side plates, the protrusion is protruded from the side of the supporting plate facing the bottom plate, the stud is protruded on the protrusion, the mounting hole passes through the supporting plate and the protrusion in sequence, the through hole is provided on the bottom plate, and the second gear is rotatably mounted on the stud.

[0011] Furthermore, the knob includes a grip plate and a rotating shaft, the mounting hole includes a first hole section, a second hole section and a third hole section connected in sequence, the inner diameter of the first hole section and the inner diameter of the third hole section are both larger than the inner diameter of the second hole section, the first hole section is arranged on a side of the supporting plate away from the base plate, the third hole section is connected to the accommodating space, the grip plate is located in the first hole section, one end of the rotating shaft is connected to the grip plate, and the other end passes through the second hole section and the third hole section in sequence and then is connected to the first gear.

[0012] Furthermore, the transmission assembly also includes a first fastener, the rotating shaft includes a first shaft rod, a second shaft rod and a third shaft rod connected in sequence, the outer diameters of the first shaft rod, the second shaft rod and the third shaft rod decrease in sequence, the first shaft rod is connected to the grip plate, the first gear is provided with a receiving groove and a first through-hole connected to the receiving groove, one end of the first shaft rod is located in the second hole section and the other end is located in the third hole section, the second shaft rod is located in the receiving groove, the third shaft rod is located in the first through-hole, and the third shaft rod is recessed with a first threaded hole on a side of the grip plate away from the grip plate, and the first fastener is connected to the first threaded hole and presses against part of the first gear.

[0013] Furthermore, the first gear includes a first toothed disc, a boss and a first meshing portion arranged in an annular manner, the first meshing portion is connected to the edge of the first toothed disc, the boss is arranged on a side of the first toothed disc away from the grip plate, the accommodating groove is recessed and extends from a side of the first toothed disc close to the grip plate toward the side of the boss, the first through-hole penetrates from the bottom wall of the accommodating groove toward the side of the boss to the outer wall of the boss, and the first meshing portion is meshed and connected with the second gear.

[0014] Furthermore, the transmission assembly also includes a pin located outside the lock seat, the second gear is provided with a square groove, a first pin hole and a second pin hole, the first pin hole and the second pin hole are both connected to the square groove, the square shaft is provided with a second through-hole, the square shaft is inserted into the square groove, one end of the pin is located in the first pin hole, and the other end is located in the second pin hole after passing through the second through-hole.

[0015] Furthermore, the transmission assembly also includes a second fastener, and the second gear is also provided with a third through-hole connected to the square groove, the stud is inserted into the third through-hole, and the stud is provided with a second threaded hole, one end of the second fastener is located in the square groove, and the other end is connected to the second threaded hole, and the second fastener covers a portion of the second gear.

[0016] Furthermore, the second gear includes a second toothed disc, an annular plate, a pillar and a second meshing portion arranged in an annular manner, the second meshing portion is fixedly arranged on the edge of the second toothed disc, the annular plate and the pillar are respectively protruded on two opposite sides of the second toothed disc, the protruding portion is also provided with an annular groove, the stud is located in the annular groove and is spaced apart from the annular groove, the annular plate is inserted into the annular groove, the square groove is recessed on the side of the pillar away from the annular plate, the third through-hole penetrates from the bottom wall of the square groove toward the side of the annular plate to the outer wall of the second toothed disc, the pillar passes through the through hole, the first pin hole and the second pin hole are both provided on the pillar, and the second meshing portion is meshed and connected with the first gear.

[0017] Furthermore, the outer diameter of the first gear is greater than the outer diameter of the second gear; and / or,

[0018] A side of the knob away from the transmission assembly is provided with at least one slot for inserting a finger.

[0019] The utility model also provides a door lock, comprising the anti-locking device as described above.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The utility model installs the first gear and the knob on the inner and outer sides of the mounting hole of the lock base respectively, so that the knob can be rotatably installed on the lock base, and the first gear replaces the traditional retaining ring. The entire installation process does not require retaining ring pliers, and the installation is convenient and quick. The second gear is rotatably installed in the lock base, the second gear is meshed with the first gear, and the square shaft is fixed on the second gear. The transmission assembly between the knob and the square shaft adopts gear transmission. The precision required for the gear transmission during the installation process is not high, so that the installation design between the first gear and the knob can be made as needed, and the tolerance gap between the knob and the inner wall of the mounting hole can be made smaller to avoid the jamming phenomenon of the knob during rotation, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the anti-locking device provided in the embodiment of the utility model Figure 1 ;

[0023] Figure 2 Schematic diagram of the structure of the anti-locking device provided in the embodiment of the utility model Figure 2 ;

[0024] Figure 3 A cross-sectional view of the anti-locking device provided in an embodiment of the present utility model;

[0025] Figure 4 An exploded view of the anti-locking device provided in an embodiment of the present utility model;

[0026] Figure 5 A schematic structural diagram of the middle frame provided in an embodiment of the present utility model;

[0027] Figure 6 A cross-sectional view of a middle frame provided in an embodiment of the present utility model;

[0028] Figure 7 A schematic diagram of the structure of a knob provided in an embodiment of the present utility model;

[0029] Figure 8 A schematic structural diagram of the first gear provided in an embodiment of the present utility model;

[0030] Figure 9 A cross-sectional view of a first gear provided in an embodiment of the present utility model;

[0031] Figure 10 A schematic structural diagram of the second gear provided in an embodiment of the present utility model;

[0032] Figure 11 A cross-sectional view of the second gear provided in an embodiment of the present utility model.

[0033] In the picture:

[0034] 10. Knob; 11. Grip; 12. Rotating shaft; 121. First shaft; 122. Second shaft; 123. Third shaft; 124. First threaded hole; 125. Slot; 20. Square shaft; 21. Second through-hole; 30. Lock seat; 31. Accommodation space; 32. Mounting hole; 321. First hole section; 322. Second hole section; 323. Third hole section; 33. Through hole; 34. Middle frame; 341. Loading plate; 342. Protrusion; 3421. Annular groove; 343. Stud; 3431. Second screw Perforations; 344, side panels; 35, bottom panels; 40, transmission assembly; 41, first gear; 411, receiving slot; 412, first through-hole; 413, first toothed disc; 414, boss; 415, first meshing portion; 42, second gear; 421, square slot; 422, first pin hole; 423, second pin hole; 424, third through-hole; 425, second toothed disc; 426, annular plate; 427, pillar; 428, second meshing portion; 43, first fastener; 44, latch; 45, second fastener. DETAILED DESCRIPTION

[0035] Below, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0036] See also Figures 1 to 9 As shown, an embodiment of the present invention discloses an anti-locking device, which is mainly used in smart door locks. The anti-locking device includes a knob 10, a square shaft 20, a lock seat 30 and a transmission assembly 40. The square shaft 20 is used to connect with the lock tongue in the lock body; the lock seat 30 is provided with a accommodating space 31, a mounting hole 32 and a through hole 33. The accommodating space 31 is arranged inside the lock seat 30, and the mounting hole 32 and the through hole 33 are both connected to the accommodating space 31. The mounting hole 32 and the through hole 33 are respectively passed through the inner wall of the accommodating space 31 to the front and back sides of the lock seat 30. The knob 10 is installed on the mounting hole 32 from the outside of the lock seat 30. The knob 10 is used to be twisted by hand. The square shaft 20 is located outside the accommodating space 31 and is arranged close to the through hole 33.

[0037] The transmission assembly 40 includes a first gear 41 and a second gear 42. The first gear 41 is located in the accommodating space 31. The first gear 41 is connected to the knob 10 and can rotate with the knob 10. One end of the second gear 42 is located in the accommodating space 31 and is rotatably installed on the lock base 30. The other end passes through the through hole 33 and is fixedly connected to the square shaft 20. The second gear 42 is meshed with the first gear 41. When the knob 10 is rotated, the knob 10 can drive the square shaft 20 to rotate forward or reverse through the transmission assembly 40, thereby driving the lock tongue to extend or retract. The tolerance gap between the knob 10 and the inner wall of the mounting hole 32 can be made smaller to avoid the knob 10 from getting stuck during rotation, thereby improving the user experience.

[0038] In some embodiments, the outer diameter of the first gear 41 is larger than the outer diameter of the second gear 42 so that when the finger gently twists the knob 10, the square shaft 20 can be accelerated to rotate forward or reverse, thereby achieving a quick locking and unlocking function.

[0039] In this embodiment, the lock seat 30 includes a middle frame 34 and a bottom plate 35. The middle frame 34 includes a supporting plate 341, a protrusion 342, a stud 343 and two side plates 344. The two side plates 344 are respectively protruded from the two side ends of the supporting plate 341. The two ends of the bottom plate 35 are respectively connected to the two side plates 344. The bottom plate 35 is used to connect with the door panel. The protrusion 342 is protruded from the side of the supporting plate 341 facing the bottom plate 35. The stud 343 is protruded from the protrusion 342. The mounting hole 32 passes through the supporting plate 341 and the protrusion 342 in sequence. The through hole 33 is provided on the bottom plate 35. The through hole 33 and the mounting hole 32 are not on the same axis. The second gear 42 is rotatably mounted on the stud 343 so as to engage with the first gear 41.

[0040] The knob 10 includes a grip plate 11 and a rotating shaft 12. The mounting hole 32 includes a first hole section 321, a second hole section 322 and a third hole section 323 connected in sequence. The inner diameter of the first hole section 321 and the inner diameter of the third hole section 323 are both larger than the inner diameter of the second hole section 322. The first hole section 321, the second hole section 322 and the third hole section 323 are coaxially arranged. The first hole section 321 is arranged on the side of the supporting plate 341 away from the bottom plate 35. The third hole section 323 is connected to the accommodating space 31. The grip plate 11 is located in the first hole section 321. One end of the rotating shaft 12 is connected to the grip plate 11, and the other end passes through the second hole section 322 and the third hole section 323 in sequence and then is connected to the first gear 41, thereby fixing the knob 10 on the lock base 30.

[0041] The transmission assembly 40 also includes a first fastener 43. The rotating shaft 12 includes a first shaft rod 121, a second shaft rod 122 and a third shaft rod 123 connected in sequence. The outer diameters of the first shaft rod 121, the second shaft rod 122 and the third shaft rod 123 decrease in sequence. The first shaft rod 121 is connected to the grip plate 11. The first gear 41 is provided with a receiving groove 411 and a first through-hole 412 connected to the receiving groove 411. One end of the first shaft rod 121 is located in the second hole section 322 and the other end is located in the third hole section 323. The second shaft rod 122 is located in the receiving groove 411. The third shaft rod 123 is located in the first through-hole 412. The side of the third shaft rod 123 away from the grip plate 11 is recessed with a first threaded hole 124 toward the side of the grip plate 11. The first fastener 43 is connected to the first threaded hole 124 and presses against part of the first gear 41, so that the first gear 41 can rotate with the knob 10. The first fastener 43 is a screw.

[0042] In some embodiments, the outer wall of the grip plate 11, which is one side of the knob 10 away from the transmission assembly 40, is provided with at least one slot 125 for inserting a finger. There are two slots 125, so that a person's fingers can be placed in the slot 125 to grasp the grip plate 11. Lightly twisting the knob 10 can achieve locking and unlocking, which is simple to operate. The surface of the knob 10 is in the same plane as the supporting plate 341, which can improve the aesthetics of the locking device. The knob 10 has a unique shape and strong versatility. It can be quickly compatible with various security door brands, and the shape of the knob 10 can be diversified.

[0043] In this embodiment, the first gear 41 includes a first toothed disc 413, a boss 414 and a first meshing portion 415 arranged in an annular manner. The first meshing portion 415 is connected to the edge of the first toothed disc 413. The boss 414 is arranged on the side of the first toothed disc 413 away from the grip plate 11. The receiving groove 411 is recessed and extends from the side of the first toothed disc 413 close to the grip plate 11 toward the side of the boss 414. The first through hole 412 penetrates from the bottom wall of the receiving groove 411 toward the side of the boss 414 to the outer wall of the boss 414. The first through hole 412 and the receiving groove 411 are coaxially arranged. The first meshing portion 415 is meshed and connected with the second gear 42 so that when the first gear 41 rotates, it can drive the second gear 42 to rotate.

[0044] In some embodiments, the cross-sections of the second shaft 122 and the accommodating groove 411 are both square structures to prevent the first gear 41 from idling relative to the knob 10, and the cross-sections of the mounting hole 32, the first through hole 412, the first shaft 121, the third shaft 123 and the through hole 33 are all circular structures.

[0045] Please see further Figures 3 to 6 ,as well as Figures 10 and 11 The transmission assembly 40 also includes a latch 44 located outside the lock seat 30. The second gear 42 is provided with a square groove 421, a first pin hole 422 and a second pin hole 423. The first pin hole 422 and the second pin hole 423 are both connected to the square groove 421. The square shaft 20 is penetrated by a second through-hole 21. The square shaft 20 is inserted into the square groove 421. The first pin hole 422, the second pin hole 423 and the second through-hole 21 are coaxially arranged. The axis of the first pin hole 422 is perpendicular to the axis of the square groove 421. One end of the latch 44 is located in the first pin hole 422, and the other end passes through the second through-hole 21 and is located in the second pin hole 423, so that the square shaft 20 can rotate with the second gear 42.

[0046] The transmission assembly 40 also includes a second fastener 45. The second gear 42 is also provided with a third through-hole 424 connected to the square groove 421. The third through-hole 424 is coaxially arranged with the square groove 421. The stud 343 is inserted into the third through-hole 424. The stud 343 is provided with a second threaded hole 3431. One end of the second fastener 45 is located in the square groove 421 and the other end is connected to the second threaded hole 3431. The second fastener 45 covers a portion of the second gear 42 to prevent the second gear 42 from disengaging from the stud 343. The second fastener 45 does not rotate with the second gear 42.

[0047] The second gear 42 includes a second toothed disc 425, an annular plate 426, a pillar 427 and a second meshing portion 428 arranged in an annular manner. The second meshing portion 428 is fixed to the edge of the second toothed disc 425. The annular plate 426 and the pillar 427 are respectively protruded on two opposite surfaces of the second toothed disc 425. The protruding portion 342 is also provided with an annular groove 3421. The stud 343 is located in the annular groove 3421 and is spaced apart from the annular groove 3421. The annular plate 426 is inserted into the annular groove 3421. The square groove 421 is recessed on the side of the pillar 427 away from the annular plate 426. The third through-hole 424 penetrates from the bottom wall of the square groove 421 toward the side of the annular plate 426 to the outer wall of the second toothed disc 425. The pillar 427 passes through the through-hole 33. The first pin hole 422 and the second pin hole 423 are both provided on the pillar 427. The second meshing portion 428 is meshed and connected with the first gear 41, thereby fixing the second gear 42 on the lock base 30.

[0048] The utility model also discloses a door lock, comprising the anti-locking device as described above, which is installed on the door panel and located on one side of the room. The anti-locking device can be easily installed, thereby improving the installation efficiency of the smart door lock.

[0049] The assembly method of the anti-locking device includes the following steps:

[0050] Step S101: Fix the knob 10 and the transmission assembly 40. First, the knob 10 is mounted on the mounting hole 32 of the middle frame 34 from one side of the middle frame 34. The first gear 41 is mounted on the knob 10 from the other side of the middle frame 34 via the first fastener 43. Then, the second gear 42 is mounted on the stud 343 of the middle frame 34 via the second fastener 45. The first gear 41 and the second gear 42 are meshed and connected.

[0051] Step S102 , fixing the bottom plate 35 , installing the bottom plate 35 on the middle frame 34 of step S101 , wherein the support 427 of the second gear 42 passes through the through hole 33 of the bottom plate 35 ;

[0052] Step S103 , fix the square shaft 20 , insert the square shaft 20 into the square groove 421 of the support 427 in step S102 , and then use the latch 44 to fix the square shaft 20 on the support 427 , thereby completing the assembly.

[0053] To sum up, the utility model installs the first gear 41 and the knob 10 on the inner and outer sides of the mounting hole 32 of the lock base 30 respectively, so as to rotatably install the knob 10 on the lock base 30, and uses the first gear 41 to replace the traditional retaining spring. The entire installation process does not require retaining spring pliers, and the installation is convenient and quick. The second gear 42 is rotatably installed in the lock base 30, and the second gear 42 is meshed with the first gear 41. The square shaft 20 is fixed on the second gear 42. The transmission assembly 40 between the knob 10 and the square shaft 20 adopts gear transmission. The precision required for gear transmission during the installation process is not high, so that the first gear 41 and the knob 10 can be installed and designed as needed, and the tolerance gap between the knob 10 and the inner wall of the mounting hole 32 can be made smaller to avoid the knob 10 from getting stuck during rotation, thereby improving the user experience.

[0054] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. An anti-locking device, characterized in that: include: knob; The square shaft is used to connect with the lock tongue in the lock body; A lock base is provided with an accommodating space, and a mounting hole and a through hole communicating with the accommodating space, the knob is mounted on the mounting hole from the outside of the lock base, and the square shaft is located outside the accommodating space and close to the through hole; The transmission assembly includes a first gear and a second gear. The first gear is located in the accommodating space. The first gear is connected to the knob and can rotate with the knob. One end of the second gear is located in the accommodating space and is rotatably mounted on the lock seat, and the other end is fixedly connected to the square shaft after passing through the through hole. The second gear is meshed with the first gear. When the knob is rotated, the knob can drive the square shaft to rotate forward or reverse through the transmission assembly.

2. The anti-locking device according to claim 1, characterized in that: The lock seat includes a middle frame and a bottom plate, the middle frame includes a bearing plate, a protrusion, a stud and two side plates, the two side plates are respectively protruded from the two side ends of the bearing plate, the two ends of the bottom plate are respectively connected to the two side plates, the protrusion is protruded from the side of the bearing plate facing the bottom plate, the stud is protruded on the protrusion, the mounting holes pass through the bearing plate and the protrusion in sequence, the through hole is provided on the bottom plate, and the second gear is rotatably mounted on the stud.

3. The anti-locking device according to claim 2, characterized in that: The knob includes a grip plate and a rotating shaft. The mounting hole includes a first hole section, a second hole section, and a third hole section connected in sequence. The inner diameters of the first hole section and the third hole section are both larger than the inner diameter of the second hole section. The first hole section is provided on a side of the bearing plate away from the base plate. The third hole section is connected to the accommodating space. The grip plate is located in the first hole section. One end of the rotating shaft is connected to the grip plate, and the other end passes through the second hole section and the third hole section in sequence and then is connected to the first gear.

4. The anti-locking device according to claim 3, characterized in that: The transmission assembly also includes a first fastener, and the rotating shaft includes a first shaft rod, a second shaft rod and a third shaft rod connected in sequence, the outer diameters of the first shaft rod, the second shaft rod and the third shaft rod decrease in sequence, the first shaft rod is connected to the grip plate, the first gear is provided with a receiving groove and a first through-hole connected to the receiving groove, one end of the first shaft rod is located in the second hole section and the other end is located in the third hole section, the second shaft rod is located in the receiving groove, the third shaft rod is located in the first through-hole, and the third shaft rod is recessed with a first threaded hole on a side of the third shaft rod away from the grip plate and facing the grip plate, the first fastener is connected to the first threaded hole and presses against part of the first gear.

5. The anti-locking device according to claim 4, characterized in that: The first gear includes a first toothed disc, a boss and a first meshing portion arranged in an annular manner. The first meshing portion is connected to the edge of the first toothed disc. The boss is provided on a side of the first toothed disc away from the grip plate. The accommodating groove is recessed and extends from a side of the first toothed disc close to the grip plate toward the side of the boss. The first through-hole penetrates from the bottom wall of the accommodating groove toward the side of the boss to the outer wall of the boss. The first meshing portion is meshed and connected with the second gear.

6. The anti-locking device according to claim 2, characterized in that: The transmission assembly also includes a latch located outside the lock seat, the second gear is provided with a square groove, a first pin hole and a second pin hole, the first pin hole and the second pin hole are both connected to the square groove, the square shaft is penetrated by a second through hole, the square shaft is inserted into the square groove, one end of the latch is located in the first pin hole, and the other end is located in the second pin hole after passing through the second through hole.

7. The anti-locking device according to claim 6, characterized in that: The transmission assembly also includes a second fastener, and the second gear is further provided with a third through-hole connected to the square groove. The stud is inserted into the third through-hole, and the stud is provided with a second threaded hole. One end of the second fastener is located in the square groove, and the other end is connected to the second threaded hole. The second fastener covers a portion of the second gear.

8. The anti-locking device according to claim 7, characterized in that: The second gear includes a second toothed disc, an annular plate, a pillar and a second meshing portion arranged in an annular manner. The second meshing portion is fixedly provided at the edge of the second toothed disc, the annular plate and the pillar are respectively protruded on two opposite sides of the second toothed disc, the protruding portion is also provided with an annular groove, the stud is located in the annular groove and is spaced apart from the annular groove, the annular plate is inserted into the annular groove, the square groove is recessed on a side of the pillar away from the annular plate, the third through-hole penetrates from the bottom wall of the square groove toward the side of the annular plate to the outer wall of the second toothed disc, the pillar passes through the through-hole, the first pin hole and the second pin hole are both provided on the pillar, and the second meshing portion is meshed and connected with the first gear.

9. The anti-locking device according to claim 1, characterized in that: The outer diameter of the first gear is greater than the outer diameter of the second gear; and / or, A side of the knob away from the transmission assembly is provided with at least one slot for inserting a finger.

10. A door lock, characterized in that: The invention comprises an anti-locking device as described in any one of claims 1 to 9.

Images