Transmission device for door lock and door lock

Abstract

The utility model relates to a transmission device for a door lock and the door lock, and a linkage mechanism is arranged between a movable seat and a base, so that the movable seat can move upwards relative to the base. The linkage mechanism comprises a lock rod, compared with the prior art, the lock rod is divided into the first lock rod body and the second lock rod body which are separated, the first lock rod body is hollow, one end of the second lock rod body penetrates through the first lock rod body and then is connected to the movable base, and the first lock rod body and the second lock rod body can rotate relatively. The first lock rod can be driven to rotate by driving the movable seat to move upwards relative to the base, and the second lock rod can be driven to rotate by driving the movable seat to move upwards relative to the base. And the spring bolt assembly does not need to be limited on the joint of the first lock rod and the second lock rod, so that the adjusting range of the mounting position of the spring bolt assembly is effectively enlarged, the assembly is easier, and the practicability is good.

Description

Technical Field

[0001] The utility model relates to the field of door locks, in particular to a transmission device for door locks and a door lock. Background Art

[0002] Ordinary household indoor door locks are installed indoors and have low anti-theft requirements. For the convenience of users, they generally do not have a reverse locking function. Its structure usually mainly includes four parts: an inner handle assembly, an outer handle assembly driving device, and a lock tongue assembly. The lock rod arranged between the inner handle assembly and the outer handle assembly cooperates with the driving device so that the user can drive the lock rod through the front handle and the rear handle to drive the lock tongue assembly to achieve locking / unlocking.

[0003] Among them, when installing this type of door lock, the lock tongue assembly needs to be stacked and arranged along the thickness direction of the door panel and sleeved on the lock rod and driven by the lock rod. It must cooperate with the driving device and the lock rod to drive the lock tongue assembly to move. Due to the limited thickness of the door panel, in order to reserve a certain thickness distance for installing the lock tongue assembly, the length of the lock rod is limited to a shorter range, and the structure of the linkage mechanism of the existing lock rod is synchronous, that is, although the lock rods are separated, the first lock rod and the second lock rod rotate synchronously, and the lock tongue assembly must be installed in the middle of the connection between the first lock rod and the second lock rod of the lock rod to achieve the inside and outside door opening. This makes the existing door lock can only be installed on door panels of fixed thickness, and the setting position of the lock tongue assembly on the door panel is limited to a very small adjustment range, and can only be adjusted while keeping the lock tongue assembly and being able to link the first lock rod and the second lock rod, and cannot meet the demand of installing this type of door lock on door panels of different thicknesses.

[0004] Therefore, how to overcome the above-mentioned defects has become an important issue to be solved urgently by those skilled in the art. Utility Model Content

[0005] The utility model overcomes the shortcomings of the above-mentioned technology and provides a transmission device for a door lock and a door lock.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A transmission device for a door lock comprises a base, a movable seat is provided on the base, a linkage mechanism is provided between the movable seat and the base, the linkage mechanism comprises a locking rod, the locking rod comprises a first locking rod and a second locking rod, the first locking rod is hollow inside, one end of the second locking rod is inserted into the first locking rod and connected to the movable seat, the first locking rod and the second locking rod can rotate relative to each other, driving the movable seat to move upward relative to the base can drive the first locking rod to rotate, and driving the second locking rod to rotate can make the movable seat move upward relative to the base.

[0008] Furthermore, the linkage mechanism also includes a gear arranged in front of the movable seat and meshing with the movable seat, and a paddle arranged behind the movable seat. The movable seat is provided with a reset mechanism capable of resetting the movable seat downward relative to the base. A limiting structure is provided between the movable seat and the paddle to enable the paddle to drive the movable seat to move upward relative to the base.

[0009] Furthermore, a first mounting hole is provided on the movable seat, and gear teeth are provided on the hole wall of the first mounting hole of the movable seat. One end of the gear is arranged in the first mounting hole and meshes with the gear teeth. The gear includes a gear end and a connecting end. A first connecting hole is provided in the gear end, and a second connecting hole is provided in the connecting end. The first locking rod is in the second connecting hole and can rotate synchronously with the gear.

[0010] Furthermore, a second mounting hole is provided on the base, the first connecting hole is connected to the second connecting hole, a third connecting hole is provided on the paddle, the second locking rod comprises an inner rod and an outer rod, the inner rod passes through the first locking rod, the second connecting hole, the first connecting hole, and the third connecting hole in sequence, and rotating the second locking rod can drive the paddle to rotate synchronously.

[0011] Furthermore, it also includes a toggle member for pushing the movable seat upward relative to the base to drive the linkage mechanism to move, the base is also provided with a third mounting hole located at the lower end of the second mounting hole, the movable seat is also provided with a groove located at the lower end of the first mounting hole, the movable seat is also provided with a protrusion located above the groove and extending laterally outward from the third mounting hole, the toggle member includes a pressing portion and an abutting portion, the abutting portion passes through the groove and the third mounting hole in sequence and then abuts against the protrusion.

[0012] Furthermore, the base is connected to a cover plate that covers the movable seat, the cover plate is provided with a fourth mounting hole and a fifth mounting hole located below the fourth mounting hole, the inner rod passes through the fourth mounting hole, the fourth mounting hole is provided with a retaining spring for fixing the inner rod, and the abutment portion passes through the fifth mounting hole and then passes through the groove and the third mounting hole in sequence.

[0013] Furthermore, the reset mechanism comprises a limiting column arranged upward on the movable seat, a spring is sleeved in the limiting column, and an upper end of the spring abuts against an upper side wall of the base.

[0014] Furthermore, the limiting structure includes raised portions arranged on the movable seat and located at both ends of the first mounting hole, and extended portions arranged on the paddle and extending to both ends, wherein the extended portions abut against the raised portions upwards.

[0015] Furthermore, connecting rods are extended forward on the left and right sides of the base, and two connecting rods are symmetrically arranged. The first screw is connected to the inner thread of the connecting rod. Connecting parts are also symmetrically arranged on the left and right sides of the base, and a second screw is arranged in the connecting part. The threaded end of the second screw extends toward the rear of the base.

[0016] A door lock further includes an inner handle assembly, an outer handle assembly and a bolt assembly, wherein the outer handle assembly includes a handle, the bolt assembly is connected to a lock rod and a connecting rod, the front side of the base is connected and fixed to the outer handle assembly by a connecting rod and a first screw, and the rear side is connected and fixed to the inner handle assembly by a connecting portion and a second screw, the toggle member is rotatably connected to the inner handle assembly by a pin, and the other end of the second lock rod is connected to the handle and can rotate with the handle. The pressing portion extends outward from the inner handle assembly, and driving the lock rod can realize locking / unlocking of the bolt assembly.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The present invention provides a transmission device for a door lock and a door lock, wherein a linkage mechanism is arranged between a movable seat and a base, so that the movable seat can move upward relative to the base. The linkage mechanism includes a lock rod. Compared with the prior art, the present invention sets the lock rod into a separate first lock rod and a second lock rod, wherein the first lock rod is hollow inside, and one end of the second lock rod is inserted into the first lock rod and connected to the movable seat, and the first lock rod and the second lock rod can rotate relative to each other. The present invention sets a linkage mechanism to cooperate with the first lock rod and the second lock rod, respectively, so that the first lock rod can be driven to rotate by driving the movable seat to move upward relative to the base, and the second lock rod can be driven to rotate to make the movable seat move upward relative to the base, so that the user can open the door whether using the inner handle assembly from inside the door or using the outer handle assembly from outside the door. That is to say, using the transmission device of the present invention with such a structure, the lock tongue assembly can be assembled at any position on the first lock rod, and the lock tongue assembly does not need to be limited to the connection between the first lock rod and the second lock rod, so that the adjustment range of the installation position of the lock tongue assembly is effectively increased, which is easier to assemble and has good practicality. Through the above structure, when the user is targeting door panels of different thicknesses, he can manufacture the first locking rod and the second locking rod that meet the thickness requirements of the door panels according to the thickness of the door panels and then assemble them together. That is, the structure of this case achieves the technical effect of adjusting the length of the first locking rod according to the thickness of the door panels. The transmission device of this structure can meet the requirements of assembling on door panels of different thicknesses, has a simple structure and good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall assembly structure of the transmission device in this case.

[0020] Figure 2 This is an exploded view of the transmission device in this case.

[0021] Figure 3 It is a structural schematic diagram of the hidden base and cover plate of the transmission device in this case.

[0022] Figure 4 It is a structural schematic diagram of the hidden cover of the transmission device in this case.

[0023] Figure 5 It is a schematic diagram of the structure of the pick in this case.

[0024] Figure 6 It is a schematic diagram of the structure of the gear in this case.

[0025] Figure 7 It is a structural diagram of the movable seat in this case.

[0026] Figure 8 It is a structural diagram of the base of this case.

[0027] Fig. 9 It is a structural schematic diagram of the cover plate in this case.

[0028] Fig.10 It is a schematic diagram of the overall assembly structure of the door lock in this case. DETAILED DESCRIPTION

[0029] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0030] Figure 2 This is an exploded view of the transmission device in this case. For the description of the position relationship of the front, rear, upper and lower parts in this case, please refer to Figure 2 Directions shown in .

[0031] like Figures 1 to 10As shown, the present invention provides a transmission device for a door lock, including a base 1, on which a movable seat 2 is arranged. In a specific implementation, a mounting cavity is opened at the rear of the base 1, and the base 1 and the movable seat 2 are square as a whole. The volume of the movable seat 2 is smaller than that of the base 1 so that it can be movably arranged in the mounting cavity. A linkage mechanism is arranged between the movable seat 2 and the base 1, and the linkage mechanism includes a locking rod 3, and the linkage mechanism is used for the linkage between the locking rod 3 and the movable seat 2. In a specific implementation, the cross section of the locking rod 3 is non-circular, that is, the first locking rod 31 and the second locking rod 32 are both non-circular rods, and the locking rod 3 can be a square tube commonly seen in the art, so that it is easier to achieve the limited fit between the components, so as to facilitate circumferential fixation. Of course, the cross section of the locking rod 3 can also be a triangle, a pentagon, etc. The locking rod 3 includes a first locking rod 31 and a second locking rod 32, the first locking rod 31 is hollow inside, and one end of the second locking rod 32 is inserted into the first locking rod 31 and connected to the movable seat 2, and the first locking rod 31 and the second locking rod 32 can rotate relative to each other after being connected. That is to say, when the first locking rod 31 rotates, the second locking rod 32 does not rotate, and when the second locking rod 32 rotates, the first locking rod 31 does not rotate. In this case, the locking rod 3 is configured as a first locking rod 31 and a second locking rod 32 that are detachably separated from each other, so that driving the movable seat 2 to move upward relative to the base 1 can drive the first locking rod 31 to rotate, and driving the second locking rod 32 to rotate can make the movable seat 2 move upward relative to the base 1.

[0032] As described above, the user can open the door whether using the inner handle assembly 100 from inside the door or using the outer handle assembly 200 from outside the door. That is to say, using the transmission device of the present case structure, the lock tongue assembly 300 can be assembled at any position on the first lock rod 31, and there is no need to limit the lock tongue assembly 300 to the connection between the first lock rod 31 and the second lock rod 32, which effectively increases the adjustment range of the installation position of the lock tongue assembly 300, is easier to assemble, and has good practicality. Through the above structure, when targeting door panels of different thicknesses, the user can manufacture the first lock rod 31 and the second lock rod 32 that meet the thickness requirements of the door panels according to the thickness of the door panels and then assemble them together, that is, the structure of the present case realizes the technical effect of adjusting the length of the first lock rod 31 according to the thickness of the door panels. The transmission device of the present case structure can meet the requirements of assembly on door panels of different thicknesses, has a simple structure, and is good in practicality.

[0033] Specifically, Figure 2-Figure 6As shown, the linkage mechanism of this case also includes a gear 4 arranged in front of the movable seat 2 and meshing with the movable seat 2, and a paddle 5 arranged behind the movable seat 2. The movable seat 2 is provided with a reset mechanism capable of resetting the movable seat 2 downward relative to the base 1. By providing the reset mechanism, after the external force drives the movable seat 2 to move upward relative to the base 1, when the external force is released, the reset mechanism can reset the movable seat 2 to its original position. A limiting structure is provided between the movable seat 2 and the paddle 5 so that the paddle 5 drives the movable seat 2 to move upward relative to the base 1.

[0034] Specifically, Figure 1-Figure 7 As shown, a first mounting hole 21 is provided on the movable seat 2, and gear teeth 22 are provided on the hole wall of the first mounting hole 21 of the movable seat 2. One end of the gear 4 is arranged in the first mounting hole 21 and meshes with the gear teeth 22. The gear 4 includes a gear end 41 and a connecting end 42. A first connecting hole 411 is provided in the gear end 41, and a second connecting hole 421 is provided in the connecting end 42. The first locking rod 31 is connected to the second connecting hole 421 and can rotate synchronously with the gear 4. As described in the previous paragraph of this specific embodiment, the second connecting hole 421 is arranged to be conveniently fixed to the first locking rod 31 in the circumferential direction, so as to facilitate the synchronous rotation between the two. That is to say, when the cross section of the first locking rod 31 is a square, the second connecting hole 421 also needs to be arranged to be a square that matches the first locking rod 31. Thus, when the first locking rod 31 is inserted into the second connecting hole 421, when the user drives the movable seat 2 to move upward relative to the base 1, the movable seat 2 drives the gear 4 to rotate through the meshing relationship between the movable seat 2 and the gear 4, thereby driving the first locking rod 31 to rotate. In specific implementation, the teeth on the gear 4 and the gear teeth 22 on the movable seat 2 can be set according to demand. Since the door opening and closing stroke of this type of lock is generally short, the demand for gear teeth 22 is relatively small, so generally the gear teeth 22 on the inner side of the movable seat 2 are set less. In order to shorten the movable path of the movable seat 2, the gear 4 can be set as a sector gear 4.

[0035] Specifically, Figure 2-Figure 8As shown, the base 1 is provided with a second mounting hole 11. The second mounting hole 11 allows the connecting end 41 of the gear 4 to extend, and is also conducive to fixing the gear 4. The first connecting hole 411 is connected with the second connecting hole 421. The gear end 41 is provided with a first connecting hole 411 connected with the second connecting hole 421. The paddle 5 is provided with a third connecting hole 51. The second locking rod 32 includes an inner rod 321 and an outer rod 322. In specific implementation, the inner rod 321 and the outer rod 322 are integrally formed, and the cross section of the inner rod 321 is smaller than the cross section of the outer rod 322, that is, the inner rod 321 is recessed inwardly along the outer circumference of the outer rod 322 and then extends laterally, so as to facilitate the inner rod 321 to pass through the first locking rod 31, the second connecting hole 421, the first connecting hole 411, and the third connecting hole 51 in sequence. The cross section of the outer rod 322 is equal to the cross section of the first locking rod 31, so as to facilitate the assembly of the bolt assembly 300. When the second lock rod 32 is rotated by applying force, the paddle 5 can be driven to rotate synchronously. It should be noted that the inner rod 321 of the second lock rod 32 is fixedly arranged in the third connection hole 51, and it also drives the paddle 5 to move by cooperating with the circumferential fixing structure of the non-circular rod-shaped structure and the non-circular third connection hole 51. In specific implementation, the cross section of the first connection hole 411 is smaller than the second connection hole 421, which is conducive to the stability of the connection of the inner rod 321, and it is not easy to shake significantly when the second lock rod 32 rotates.

[0036] Furthermore, if Figure 1-Figure 4 , Fig.10 As shown, the transmission device of the present case also includes a toggle member 6 for pushing the movable seat 2 upward relative to the base 1 to drive the linkage mechanism to move. The setting of the toggle member 6 is convenient for the user to use the toggle member 6 from the outside to drive the linkage mechanism to move, thereby driving the movable seat 2 to move upward relative to the base 1 and then driving the first locking rod 31 to rotate. The base 1 is also provided with a third mounting hole 12 located at the lower end of the second mounting hole 11, the movable seat 2 is also provided with a groove 23 located at the lower end of the first mounting hole 21, and the movable seat 2 is also provided with a convex block 24 located above the groove 23 and extending outwardly from the third mounting hole 12. The toggle member 6 includes a pressing portion 61 and an abutting portion 62, and the abutting portion 62 passes through the groove 23 and the third mounting hole 12 in sequence and then abuts against the convex block 24. In specific implementation, the user can press the pressing portion 61 of the toggle member 6 to make the abutting portion 62 tilt upward, and the abutting portion 62 abuts against the convex block 24 to push upward, thereby driving the movable seat 2 to move upward.

[0037] Furthermore, if Figure 1-Figure 4 , Fig. 9As shown, the base 1 is connected with a cover plate 7 that covers the movable seat 2, and the cover plate 7 is provided with a fourth mounting hole 71 and a fifth mounting hole 72 located below the fourth mounting hole 71, and the inner rod 321 passes through the fourth mounting hole 71, and a retaining spring 8 for fixing the inner rod 321 is provided in the fourth mounting hole 71, and the retaining spring 8 is provided to fix the inner rod 321 in the fourth mounting hole 71 to stabilize the stability of the connection of the inner rod 321, and at the same time effectively ensure the stability of the connection between the inner rod 321 and the paddle 5, so as to prevent the paddle 5 from being displaced when the second locking rod 32 rotates. After passing through the fifth mounting hole 72, the abutment portion 62 passes through the groove 23 and the third mounting hole 12 in sequence.

[0038] Specifically, Figure 1-Figure 4 , Figure 7 As shown, the reset mechanism includes a limit column 25 disposed upward on the movable seat 2, and a spring 9 is sleeved in the limit column 25, and the upper end of the spring 9 abuts against the upper side wall of the base 1. In specific implementation, after the external force drives the movable seat 2 to move upward relative to the base 1, the spring 9 is compressed, and when the external force is released, the spring 9 is reset, thereby resetting the movable seat 2 to its original position. By setting up an elastic reset mechanism, the linkage mechanism always maintains its original state, so that the user can drive the movable seat 2 to move upward relative to the base 1 at any time, thereby driving the first locking rod 31 to rotate, driving the second locking rod 32 to rotate, thereby driving the movable seat 2 to move upward relative to the base 1, thereby performing corresponding unlocking inside and outside.

[0039] Specifically, Figure 4 , Figure 5 , Figure 7 As shown, the limiting structure of this case includes a protrusion 26 disposed on the movable seat 2 and located at both ends of the first mounting hole 21, and an extension 52 disposed on the paddle 5 and extending to both ends, and the extension 52 abuts against the protrusion 26 upward. When the user drives the second locking rod 32 to rotate, the paddle 5 is driven to rotate by the inner rod 321 of the second locking rod 32, and the extensions 52 at both ends of the paddle 5 abut against the protrusion 26 to push up the movable seat 2, thereby driving the movable seat 2 to move upward relative to the base 1.

[0040] like Figure 7 , Fig.10As shown, in order to facilitate the installation and fixing of the transmission device of this case on the door lock, a connecting rod 13 is provided on the left and right sides of the base 1 to extend forward, and two connecting rods 13 are symmetrically provided. The connecting rod 13 is internally threaded with a first screw 14. The arrangement of the connecting rod 13 and the first screw 14 facilitates the connection of the lock tongue assembly 300 and the outer handle assembly 200 on the door lock. The left and right sides of the base 1 are also symmetrically provided with a connecting portion 15, and a second screw 16 is arranged in the connecting portion 15, and the threaded end of the second screw 16 extends toward the rear of the base 1. In specific implementation, the connecting portion 15 is symmetrically provided with two or four, and in this case, it is preferably provided with four, which are respectively arranged at the four corners of the base 1. This threaded connection method has a simple structure, is easy to implement, and is easy to disassemble and assemble.

[0041] like Fig.10 As shown, the present invention also provides a door lock, which includes the above-mentioned transmission device, and also includes an inner handle assembly 100, an outer handle assembly 200 and a lock tongue assembly 300, wherein the outer handle assembly 200 includes a handle 201. It should be noted that the inner handle assembly 100, the outer handle assembly 200 and the lock tongue assembly 300 of the present invention can use commonly used structures on the market, and for the convenience of installation, it is sufficient to make minor adaptive structural improvements according to the transmission device of the present invention, and the detailed description of the specific structure is not given here. The lock tongue assembly 300 is connected to the lock rod 3 and the connecting rod 13. The front side of the base 1 is connected and fixed to the outer handle assembly 200 through the connecting rod 13 and the first screw 14, and the rear side is connected and fixed to the inner handle assembly 100 through the connecting portion 15 and the second screw 16. The toggle member 6 is rotatably connected to the inner handle assembly 100 through the pin 63. The other end of the second lock rod 32 is connected to the handle 201 and can rotate with the handle 201. Rotating the handle 201 can drive the second lock rod 32 to rotate to achieve locking / unlocking of the lock tongue assembly 300. It should be noted that, as described in the previous paragraph of this specific embodiment, the inside of the handle 201 is connected to the second lock rod 32 through a circumferentially fixed structure so that the two can rotate synchronously. This structure will not be repeated here. The pressing portion 61 extends outward from the inner handle assembly 100, and driving the lock rod 3 can achieve locking / unlocking of the lock tongue assembly 300.

[0042] The working principle of the door lock in this case is: during installation, the user installs the lock tongue assembly 300 at any position of the first lock rod 31.

[0043] The user presses down the toggle member 6 on the inner handle assembly 100, and by pressing the pressing portion 61 of the toggle member 6, the abutting portion 62 can be tilted upward, and the abutting portion 62 abuts against the protrusion 24 to push upward, thereby driving the movable seat 2 to move upward relative to the base 1, and then through the meshing relationship between the movable seat 2 and the gear 4, the movable seat 2 drives the gear 4 to rotate, thereby driving the first locking rod 31 to rotate, thereby unlocking the lock tongue assembly 300.

[0044] Correspondingly, when the user opens the door from the other side, the handle 201 on the outer handle assembly 200 is pressed to drive the second locking rod 32 to rotate, and the inner rod 321 of the second locking rod 32 drives the paddle 5 to rotate, and the extension portions 52 at both ends of the paddle 5 abut against the protrusion 26 to push the movable seat 2 upward, thereby driving the movable seat 2 to move upward relative to the base 1 to unlock the lock tongue assembly 300.

[0045] As mentioned above, this case protects a transmission device for a door lock and a door lock. All technical solutions that are the same or similar to this case should be shown to fall within the scope of protection of this case.

Claims

1. A transmission device for a door lock, comprising a base (1), wherein a movable seat (2) is provided on the base (1), and characterized in that: A linkage mechanism is provided between the movable seat (2) and the base (1), the linkage mechanism comprising a locking rod (3), the locking rod (3) comprising a first locking rod (31) and a second locking rod (32), the first locking rod (31) being hollow inside, one end of the second locking rod (32) being inserted into the first locking rod (31) and connected to the movable seat (2), the first locking rod (31) and the second locking rod (32) being rotatable relative to each other, driving the movable seat (2) to move upward relative to the base (1) can drive the first locking rod (31) to rotate, and driving the second locking rod (32) to rotate can cause the movable seat (2) to move upward relative to the base (1).

2. A transmission device for a door lock according to claim 1, characterized in that: The linkage mechanism further comprises a gear (4) arranged in front of the movable seat (2) and meshing with the movable seat (2), and a paddle (5) arranged behind the movable seat (2); a reset mechanism is provided on the movable seat (2) and is capable of resetting the movable seat (2) downward relative to the base (1); and a limiting structure is provided between the movable seat (2) and the paddle (5) so that the paddle (5) drives the movable seat (2) to move upward relative to the base (1).

3. A transmission device for a door lock according to claim 2, characterized in that: The movable seat (2) is provided with a first mounting hole (21), and a gear tooth (22) is provided on the hole wall of the first mounting hole (21) of the movable seat (2). One end of the gear (4) is arranged in the first mounting hole (21) and meshes with the gear tooth (22). The gear (4) comprises a gear end (41) and a connecting end (42). A first connecting hole (411) is provided in the gear end (41), and a second connecting hole (421) is provided in the connecting end (42). The first locking rod (31) is connected to the second connecting hole (421) and can rotate synchronously with the gear (4).

4. A transmission device for a door lock according to claim 3, characterized in that: The base (1) is provided with a second mounting hole (11), the first connecting hole (411) and the second connecting hole (421) are connected, the paddle (5) is provided with a third connecting hole (51), the second locking rod (32) comprises an inner rod (321) and an outer rod (322), the inner rod (321) passes through the first locking rod (31), the second connecting hole (421), the first connecting hole (411), and the third connecting hole (51) in sequence, and when the second locking rod (32) is rotated, the paddle (5) can be driven to rotate synchronously.

5. A transmission device for a door lock according to claim 4, characterized in that: The movable seat (2) further comprises a toggle member (6) for pushing the movable seat (2) upward relative to the base (1) so as to drive the linkage mechanism to move. The base (1) is also provided with a third mounting hole (12) located at the lower end of the second mounting hole (11). The movable seat (2) is also provided with a groove (23) located at the lower end of the first mounting hole (21). The movable seat (2) is also provided with a protrusion (24) located above the groove (23) and extending outwardly to form the third mounting hole (12). The toggle member (6) comprises a pressing portion (61) and an abutting portion (62). The abutting portion (62) passes through the groove (23) and the third mounting hole (12) in sequence and then abuts against the protrusion (24).

6. A transmission device for a door lock according to claim 5, characterized in that: The base (1) is connected to a cover plate (7) that covers the movable seat (2); the cover plate (7) is provided with a fourth mounting hole (71) and a fifth mounting hole (72) located below the fourth mounting hole (71); the inner rod (321) passes through the fourth mounting hole (71); a retaining spring (8) for fixing the inner rod (321) is provided in the fourth mounting hole (71); the abutment portion (62) passes through the fifth mounting hole (72) and then passes through the groove (23) and the third mounting hole (12) in sequence.

7. A transmission device for a door lock according to claim 2, characterized in that: The reset mechanism comprises a limit column (25) arranged upward on the movable seat (2), a spring (9) is sleeved in the limit column (25), and the upper end of the spring (9) abuts against the upper side wall of the base (1).

8. A transmission device for a door lock according to claim 2, characterized in that: The limiting structure comprises a protrusion (26) arranged on the movable seat (2) and located at both ends of the first mounting hole (21), and an extension (52) arranged on the paddle (5) and extending toward both ends, wherein the extension (52) abuts against the protrusion (26) upward.

9. A transmission device for a door lock according to any one of claims 1 to 8, characterized in that: Connecting rods (13) are provided on both sides of the base (1) extending forward, and two connecting rods (13) are symmetrically provided. A first screw (14) is connected to the inner thread of the connecting rod (13). Connecting parts (15) are also symmetrically provided on both sides of the base (1). A second screw (16) is provided in the connecting part (15), and the threaded end of the second screw (16) extends toward the rear of the base (1).

10. A door lock, comprising the transmission device for a door lock according to claim 9, characterized in that: The invention also comprises an inner handle assembly (100), an outer handle assembly (200) and a locking tongue assembly (300), wherein the outer handle assembly (200) comprises a handle (201), and the locking tongue assembly (300) is connected to a locking rod (3) and a connecting rod (13); the front side of the base (1) is connected and fixed to the outer handle assembly (200) through a connecting rod (13) and a first screw (14), and the rear side is connected and fixed to the inner handle assembly (100) through a connecting portion (15) and a second screw (16); the toggle member (6) is rotatably connected to the inner handle assembly (100) through a pin shaft (63); the other end of the second locking rod (32) is connected to the handle (201) and can rotate with the handle (201); the pressing portion (61) extends outward from the inner handle assembly (100); and the locking rod (3) is driven to realize locking / unlocking of the locking tongue assembly (300).

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