CN220267420U - Transmission mechanism and lockset - Google Patents

Abstract

The utility model discloses a transmission mechanism and a lockset with the same, wherein the transmission mechanism comprises a protective cover and a transmission assembly; the protection cover is symmetrically provided with a first connecting structure and a second connecting structure, two protection covers are provided, an accommodating cavity is formed between the two protection covers, the first connecting structure of one protection cover is fixedly connected with the second connecting structure of the other protection cover, the cavity wall of the accommodating cavity is provided with an opening communicated with the outside, a driving shaft is arranged in the accommodating cavity, and the driving shaft is rotatably connected with the protection covers; the transmission component is arranged in the accommodating cavity. The first connecting structure and the second connecting structure are symmetrically arranged on the protective cover, so that the two protective covers can be arranged into the same part with the same structure, and further the two protective covers can be formed by processing the same die; meanwhile, the first connecting structure and the second connecting structure can reduce the number of connecting pieces between the two protective covers, so that the number of parts of the whole transmission mechanism can be reduced, and the manufacturing difficulty of the transmission mechanism is reduced.

Description

Transmission mechanism and lockset

Technical Field

The utility model relates to the technical field of locks, in particular to a transmission mechanism and a lock.

Background

A transmission mechanism is arranged in the lockset, and is driven by a key to work, and the transmission mechanism drives the movable rod to linearly move so as to realize the opening or closing of the door;

the transmission mechanism in the related art comprises an upper cover and a lower cover, wherein the middle parts of the upper cover and the lower cover are fixedly connected through rivets, a spring plate is arranged at the edge of the upper cover or the lower cover, and the spring plate is connected with the upper cover and the lower cover so as to realize the connection between the edge of the upper cover and the edge of the lower cover;

accordingly, the transmission mechanism in the prior art has a plurality of parts and is inconvenient to manufacture.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art, and a first aspect of the present utility model provides a transmission mechanism which is convenient to manufacture. A second aspect of the utility model provides a lock comprising the transmission mechanism of the first aspect of the utility model.

According to a first aspect of the utility model, a transmission mechanism is provided, comprising a protective cover and a transmission assembly; the protection cover is symmetrically provided with a first connecting structure and a second connecting structure, two protection covers are provided, an accommodating cavity is formed between the two protection covers, the first connecting structure of one protection cover is fixedly connected with the second connecting structure of the other protection cover, the cavity wall of the accommodating cavity is provided with an opening communicated with the outside, a driving shaft is arranged in the accommodating cavity, and the driving shaft is rotatably connected with the protection covers; the transmission assembly is arranged in the accommodating cavity and comprises a connecting rod structure and a movable rod, the movable rod is slidably arranged in the accommodating cavity and at least partially extends out to the outside through an opening, one end of the connecting rod structure is rotatably connected with the movable rod, the other end of the connecting rod structure is fixedly connected with the driving shaft, and the driving shaft can rotate under the action of external force so as to drive the movable rod to extend out of or retract into the accommodating cavity relatively through the connecting rod structure.

The transmission mechanism of the utility model has at least the following beneficial effects: the protection covers are symmetrically provided with a first connecting structure and a second connecting structure, and the first connecting structure of one protection cover is fixedly connected with the second connecting structure of the other protection cover. The first connecting structure and the second connecting structure are symmetrically arranged on the protective cover, so that the two protective covers can be arranged to be identical parts with identical structures, and further the two protective covers can be formed by machining with the same die, thereby reducing the types of parts in the transmission mechanism and reducing the manufacturing difficulty of the transmission mechanism.

According to the transmission mechanism disclosed by the embodiment of the first aspect of the utility model, the first connecting structure is a connecting groove, the notch end of the connecting groove is contracted towards the inside of the connecting groove to form a contracted opening, and the width of the contracted opening is smaller than that of the connecting groove; the second connection structure is a connection protrusion, the end part of the connection protrusion is provided with a protrusion part, the connection protrusion is inserted into the connection groove, and the width of the protrusion part is larger than that of the contraction opening.

According to the transmission mechanism of the embodiment of the first aspect of the utility model, a plurality of first connecting structures and second connecting structures are arranged, and the plurality of first connecting structures and the plurality of second connecting structures are arranged along the edge of the protective cover.

According to the transmission mechanism of the embodiment of the first aspect of the utility model, a plurality of fixed connecting pieces are arranged between the two protection covers, the fixed connecting pieces are respectively and fixedly connected with the middle parts of the two protection covers, and at least one fixed connecting piece is positioned on the moving path of the connecting rod structure.

According to the transmission mechanism of the embodiment of the first aspect of the utility model, the connecting rod structure comprises a first rod piece and a second rod piece, one end of the first rod piece is fixedly connected with the driving shaft, the other end of the first rod piece is rotatably connected with one end of the second rod piece, the other end of the second rod piece is rotatably connected with the movable rod, and at least one fixed connecting piece is positioned on the moving path of the first rod piece.

According to the transmission mechanism of the embodiment of the first aspect of the utility model, the connecting rod structure comprises a first rod piece, a second rod piece and a plurality of third rod pieces, the plurality of third rod pieces are sequentially and rotatably connected end to end, the middle part of each third rod piece is rotatably and slidably connected with the protective cover, the sliding direction of each third rod piece is parallel to the moving direction of the corresponding movable rod, one end of each first rod piece is fixedly connected with the driving shaft, the other end of each first rod piece is rotatably connected with the end part of each third rod piece close to the first rod piece, one end of each second rod piece is rotatably connected with the corresponding movable rod, the other end of each second rod piece is rotatably connected with the end part of each third rod piece close to the corresponding second rod piece, and at least one fixed connecting piece is located on the moving path of each first rod piece.

According to the transmission mechanism disclosed by the embodiment of the first aspect of the utility model, the middle part of the third rod piece is provided with the first strip hole, the extending direction of the first strip hole is parallel to the moving direction of the movable rod, the protective cover is provided with the limit rod, and the limit rod is movably arranged in the first strip hole in a penetrating manner.

According to the transmission mechanism of the embodiment of the first aspect of the utility model, the edges of the protective covers are provided with penetrating slots, and the slot walls of the penetrating slots of the two protective covers surround to form an opening.

According to the transmission mechanism disclosed by the embodiment of the first aspect of the utility model, openings are formed in two opposite cavity walls of the accommodating cavity, the transmission assembly is provided with two groups, and movable rods of the two groups of transmission assemblies are respectively arranged in the two openings in a penetrating manner.

According to a second aspect of the present utility model, a transmission mechanism includes a transmission mechanism provided by the first aspect of the present utility model, the lock further includes a mounting seat, the transmission assembly is disposed on the mounting seat, the mounting seat is provided with a socket hole, and the movable rod is inserted into the socket hole.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described below with reference to the drawings and examples;

FIG. 1 is a schematic diagram of a transmission mechanism according to an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of the structure at A of the transmission mechanism of FIG. 1;

FIG. 3 is a schematic view of the internal structure of the transmission mechanism shown in FIG. 1;

FIG. 4 is a schematic diagram showing a combination of two protective covers of the transmission mechanism shown in FIG. 1;

fig. 5 is a schematic structural view of a protective cover of the transmission mechanism shown in fig. 1.

Reference numerals:

a transmission mechanism 100; a receiving chamber 110; an opening 120; a drive shaft 130; a key hole 131; a fixed connection 140;

a protective cover 200; a first connection structure 210; a pinch portion 211; a second connection structure 220; a boss 221; a through slot 230; a stopper rod 240; a third elongated aperture 250;

a transmission assembly 300; a linkage structure 310; a first lever 311; a second lever 312; a third bar 313; a first elongated hole 313a; a movable lever 320; a guide bar 321.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

The transmission mechanism 100 and the lock of the present utility model are described in detail below with reference to fig. 1 to 5.

Referring to fig. 1, a transmission mechanism 100 according to an embodiment of the first aspect of the present utility model includes a protective cover 200 and a transmission assembly 300.

The protection covers 200 are symmetrically provided with a first connecting structure 210 and a second connecting structure 220, two protection covers 200 are provided, a containing cavity 110 is formed between the two protection covers 200, the first connecting structure 210 of one protection cover 200 is fixedly connected with the second connecting structure 220 of the other protection cover 200, an opening 120 communicated with the outside is formed in the cavity wall of the containing cavity 110, a driving shaft 130 is arranged in the containing cavity 110, and the driving shaft 130 is rotatably connected with the protection covers 200; the transmission assembly 300 is arranged in the accommodating cavity 110, the transmission assembly 300 comprises a connecting rod structure 310 and a movable rod 320, the movable rod 320 is slidably arranged in the accommodating cavity 110 and extends out to the outside at least partially through the opening 120, one end of the connecting rod structure 310 is rotatably connected with the movable rod 320, the other end of the connecting rod structure 310 is fixedly connected with the driving shaft 130, and the driving shaft 130 can rotate under the action of external force so as to drive the movable rod 320 to extend out or retract into the accommodating cavity 110 relatively through the connecting rod structure 310.

For example, as shown in fig. 1, 3 and 4, the transmission mechanism 100 includes a transmission assembly 300 and two protection covers 200, the two protection covers 200 are distributed along a vertical direction, a containing cavity 110 is formed between the two protection covers 200, the transmission assembly 300 is arranged in the containing cavity 110, a driving shaft 130 is arranged at a central position of the containing cavity 110, the driving shaft 130 is arranged to extend along the vertical direction, an upper end and a lower end of the driving shaft 130 are respectively rotatably connected with the two protection covers 200, and an opening 120 communicated with the outside is arranged on a side wall of the containing cavity 110; the two protection covers 200 have the same structure, the left and right ends of the protection covers 200 are symmetrically provided with a first connection structure 210 and a second connection structure 220, the first connection structure 210 of the protection cover 200 positioned above is fixedly connected with the second connection structure 220 of the protection cover 200 positioned below, and the second connection structure 220 of the protection cover 200 positioned above is fixedly connected with the first connection structure 210 of the protection cover 200 positioned below; the transmission assembly 300 comprises a connecting rod structure 310 and a movable rod 320, wherein the movable rod 320 extends along the horizontal direction, the movable rod 320 penetrates through the opening 120, one end of the connecting rod structure 310 is fixedly connected with the driving shaft 130, and the other end of the connecting rod structure 310 is rotatably connected with the movable rod 320.

It can be understood that, in the transmission mechanism 100 of the present utility model, the driving shaft 130 can rotate under the driving of the external force, and the driving shaft 130 can drive the movable rod 320 to move along the horizontal direction through the connecting rod structure 310, so that the movable rod 320 is far away from or near to the accommodating cavity 110; when the transmission mechanism 100 is applied to the lockset, the transmission mechanism 100 can be installed on the installation seat, a user can drive the driving shaft 130 to rotate through a key, and then, the driving shaft 130 can drive the movable rod 320 to move along the horizontal direction through the connecting rod structure 310, when the movable rod 320 is far away from the accommodating cavity 110 to extend into the inserting hole of the installation seat, locking of the lockset is achieved, and when the movable rod 320 is close to the accommodating cavity 110 to leave the inserting hole of the installation seat, unlocking of the lockset is achieved.

It can be understood that the first connection structure 210 and the second connection structure 220 are symmetrically disposed on the protective covers 200, wherein the first connection structure 210 of one protective cover 200 is fixedly connected with the second connection structure 220 of the other protective cover 200; the first connection structure 210 and the second connection structure 220 are both disposed on the protection covers 200, and the fixed connection between the two protection covers 200 is realized through the fixed connection between the first connection structure 210 and the second connection structure 220, so that the number of connecting pieces for connecting the two protection covers 200 can be reduced, and the manufacturing difficulty of the transmission mechanism 100 is reduced.

It can be appreciated that the first connection structure 210 and the second connection structure 220 are symmetrically disposed on the protection covers 200, wherein the first connection structure 210 of one protection cover 200 is fixedly connected with the second connection structure 220 of the other protection cover 200, so that the two protection covers 200 can be disposed in the same structure, and further the two protection covers 200 can be manufactured by the same mold, and further the manufacturing cost of the transmission mechanism 100 can be reduced.

Further, referring to fig. 4, the driving shaft 130 penetrates through the protection cover 200, and a key hole 131 adapted to a key is provided in the center of the driving shaft 130.

In some embodiments of the present utility model, the first connection structure 210 is a connection groove, and the notch end of the connection groove is shrunk inwards of the connection groove to form a shrinkage opening, and the width of the shrinkage opening is smaller than that of the connection groove; the second connection structure 220 is a connection protrusion, the end of the connection protrusion is provided with a protrusion 221, the connection protrusion is inserted into the connection groove, and the width of the protrusion 221 is larger than the width of the shrinkage port. For example, as shown in fig. 2, the first connection structure 210 is a connection groove, two shrinkage portions 211 are provided at the notch of the connection groove, the two shrinkage portions 211 extend into the connection groove, and a shrinkage opening is formed between the two shrinkage portions 211; the second connection structure 220 is a connection protrusion, and protruding portions 221 are respectively provided at both sides of the end of the connection protrusion in the horizontal direction; the connecting protrusion is inserted into the connecting groove, the two necking parts 211 are respectively abutted with the two protruding parts 221 so as to prevent the protruding parts 221 from being separated from the connecting groove, the side wall of the connecting protrusion is abutted with the side wall of the connecting groove, and the side wall of the connecting groove can limit the movement of the connecting protrusion in the horizontal direction.

Further, in order to enhance the connection firmness between the first connection structure 210 and the second connection structure 220, the side walls of the connection protrusions can be riveted with the side walls of the connection grooves, and the reduced portions 211 can be riveted with the protrusions 221.

In some embodiments of the present utility model, the first connection structure 210 and the second connection structure 220 are each provided in plurality, and the first connection structure 210 and the second connection structure 220 are each provided along the edge of the protection cover 200. For example, two first connection structures 210 and two second connection structures 220 are respectively disposed at the left and right ends of the protection cover 200, and two first connection structures 210 are respectively disposed at the front and rear edges of the protection cover 200, and two second connection structures 220 are respectively disposed at the front and rear edges of the protection cover 200. The first connection structure 210 and the second connection structure 220 are provided with a plurality of connection structures, so that the connection firmness between the two protection covers 200 can be improved.

In some embodiments of the present utility model, referring to fig. 3, a plurality of fixing connectors 140 are disposed between two protection covers 200, the fixing connectors 140 are respectively and fixedly connected with the middle portions of the two protection covers 200, and at least one fixing connector 140 is located on the moving path of the link structure 310. The fixing connection pieces 140 are respectively and fixedly connected with the middle parts of the two protective covers 200, so that the connection firmness between the two protective covers 200 can be improved; the at least one fixed connection piece 140 is located on the moving path of the connecting rod structure 310, and then the fixed connection piece 140 located on the moving path of the connecting rod structure 310 can limit the displacement travel of the connecting rod structure 310, and then limit the displacement travel of the movable rod 320, and a worker can correspondingly set the position of the fixed connection piece 140 according to the displacement travel of the movable rod 320; meanwhile, the displacement travel of the movable rod 320 is limited by the fixed connection 140, so that the setting of an additional limiting structure can be reduced, and the structure of the transmission mechanism 100 of the utility model is simplified.

In some embodiments of the present utility model, referring to fig. 3, the link structure 310 includes a first lever 311 and a second lever 312, one end of the first lever 311 is fixedly connected to the driving shaft 130, the other end of the first lever 311 is rotatably connected to one end of the second lever 312, the other end of the second lever 312 is rotatably connected to the movable lever 320, and at least one fixed connection 140 is located on a moving path of the first lever 311. Under the action of external force, the driving shaft 130 can rotate, the driving shaft 130 can drive the first rod piece 311 to rotate, the first rod piece 311 drives the second rod piece 312 to swing, and the second rod piece 312 drives the movable rod 320 to horizontally move, so that the movable rod 320 is close to or far from the accommodating cavity 110.

In other embodiments of the present utility model, referring to fig. 3, the link structure 310 includes a first rod 311, a second rod 312, and a plurality of third rods 313, the plurality of third rods 313 are rotatably connected end to end, a middle portion of each third rod 313 is rotatably and slidably connected to the protection cover 200, a sliding direction of each third rod 313 is parallel to a moving direction of the corresponding movable rod 320, one end of the first rod 311 is fixedly connected to the driving shaft 130, the other end of the first rod 311 is rotatably connected to an end portion of the third rod 313 adjacent to the first rod 311, one end of the second rod 312 is rotatably connected to the corresponding movable rod 320, the other end of the second rod 312 is rotatably connected to an end portion of the third rod 313 adjacent to the second rod 312, and at least one fixed connection member 140 is located on a moving path of the first rod 311. It will be appreciated that by providing the third lever 313 between the first lever 311 and the second lever 312, it is possible to accommodate a situation in which the distance between the driving shaft 130 and the movable lever 320 is long.

Further, referring to fig. 3, a first elongated hole 313a is formed in the middle of the third rod 313, the extending direction of the first elongated hole 313a is parallel to the moving direction of the movable rod 320, the protection cover 200 is provided with a limiting rod 240, and the limiting rod 240 is movably disposed in the first elongated hole 313a in a penetrating manner. The movable lever 320 can be extended in the left-right direction, the first elongated hole 313a can be extended in the left-right direction, and the movable lever 320 can be moved in the left-right direction. The first elongated hole 313a is simple in structure and easy to implement.

Optionally, a penetrating rod may be disposed in the middle of the third rod 313, and the protection cover 200 may be provided with a second elongated hole, where an extending direction of the second elongated hole is parallel to a moving direction of the movable rod 320, and the penetrating rods of the third rods 313 are all penetrating into the second elongated hole.

In some embodiments of the present utility model, referring to fig. 3, a third elongated hole 250 is provided on the protection cover 200, the extending direction of the third elongated hole 250 is parallel to the moving direction of the movable rod 320, a guiding rod 321 is provided on the movable rod 320, and the guiding rod 321 is slidably disposed in the third elongated hole 250. And the guide bar 321 can guide the second rod 312 to move along the third elongated hole 250.

Further, referring to fig. 3, in order to simplify the transmission mechanism 100 of the present utility model, the guide lever 321 may be a rotating shaft rotatably connected to the third lever 313 by the movable lever 320.

In some embodiments of the present utility model, referring to fig. 4 and 5, the edges of the protection covers 200 are provided with through slots 230, and the slot walls of the through slots 230 of the two protection covers 200 surround the opening 120. The opening 120 is formed by surrounding the groove walls of the insertion grooves 230 on the two protective covers 200, so that the two protective covers 200 are designed to be the same, and the protective covers 200 are convenient to manufacture; meanwhile, when the transmission assembly 300 is installed, the transmission assembly 300 can be placed on one protection cover 200, the movable rod 320 is penetrated into the penetrating slot 230, and the other protection cover 200 can be covered on the protection cover 200 with the transmission assembly 300, so that the installation difficulty of the transmission mechanism 100 is reduced.

Further, the two opposite cavity walls of the accommodating cavity 110 are respectively provided with an opening 120, the transmission assembly 300 is provided with two groups, and the movable rods 320 of the two groups of transmission assemblies 300 are respectively arranged in the two openings 120 in a penetrating manner. For example, as shown in fig. 5, an opening 120 is respectively provided on the cavity walls on the left and right sides of the accommodating cavity 110, two sets of transmission assemblies 300 are provided, the two sets are respectively located on the left and right sides of the driving shaft 130, the connecting rod structures 310 of the two sets of transmission assemblies 300 are fixedly connected with the driving shaft 130, and the movable rods 320 of the two sets of transmission assemblies 300 are respectively inserted into the two openings 120. And one drive shaft 130 can drive both sets of transmission assemblies 300 simultaneously.

The lock according to the second aspect of the present utility model includes the transmission mechanism 100 according to the first aspect of the present utility model, and the lock further includes a mounting seat, on which the transmission assembly 300 is disposed, and the mounting seat is provided with a socket, and the movable rod 320 is inserted into the socket.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A transmission (100), characterized by comprising:

the protective cover (200), the symmetry is equipped with first connection structure (210) and second connection structure (220) on protective cover (200), protective cover (200) are equipped with two, two between protective cover (200) form and hold chamber (110), one of them first connection structure (210) of protective cover (200) with wherein the second connection structure (220) of another protective cover (200) are fixed connection, be equipped with opening (120) of intercommunication external world on holding the chamber wall in chamber (110), be equipped with drive shaft (130) in holding chamber (110), drive shaft (130) with rotatable connection of protective cover (200);

the transmission assembly (300) is arranged in the accommodating cavity (110), the transmission assembly (300) comprises a connecting rod structure (310) and a movable rod (320), and the movable rod (320)

The movable rod is arranged in the accommodating cavity (110) in a sliding manner, at least part of the movable rod extends out to the outside through the opening (120), one end of the connecting rod structure (310) is rotatably connected with the movable rod (320), the other end of the connecting rod structure (310) is fixedly connected with the driving shaft (130), and under the action of external force, the driving shaft (130) can rotate so as to drive the movable rod (320) to extend out or retract into the accommodating cavity (110) through the connecting rod structure (310).

2. The transmission mechanism (100) of claim 1, wherein the first connection structure (210) is a connection slot, and a slot end of the connection slot is shrunk toward an inside of the connection slot to form a shrinkage opening, and a width of the shrinkage opening is smaller than a width of the connection slot; the second connecting structure (220) is a connecting protrusion, a protruding portion (221) is arranged at the end of the connecting protrusion, the connecting protrusion is inserted into the connecting groove, and the width of the protruding portion (221) is larger than that of the shrinkage opening.

3. A transmission mechanism (100) according to claim 1 or 2, wherein a plurality of first connection structures (210) and a plurality of second connection structures (220) are provided, and wherein a plurality of first connection structures (210) and a plurality of second connection structures (220) are provided along an edge of the protective cover (200).

4. A transmission mechanism (100) according to claim 1 or 2, wherein a plurality of fixed connection members (140) are provided between two protective covers (200), the fixed connection members (140) being fixedly connected to the middle portions of the two protective covers (200), respectively, at least one of the fixed connection members (140)

Is located in the path of movement of the linkage (310).

5. The transmission mechanism (100) according to claim 4, wherein the link structure (310) comprises a first rod member (311) and a second rod member (312), one end of the first rod member (311) is fixedly connected to the driving shaft (130), the other end of the first rod member (311) is rotatably connected to one end of the second rod member (312), the other end of the second rod member (312) is rotatably connected to the movable rod (320), and at least one of the fixed connection members (140) is located on a moving path of the first rod member (311).

6. The transmission mechanism (100) according to claim 4, wherein the link structure (310) comprises a first rod (311), a second rod (312) and a plurality of third rods (313), the plurality of third rods (313) are rotatably connected end to end, a middle portion of the third rod (313) is rotatably and slidably connected with the protective cover (200), a sliding direction of the third rod (313) is parallel to a moving direction of the movable rod (320), one end of the first rod (311) is fixedly connected with the driving shaft (130), the other end of the first rod (311) is rotatably connected with an end portion of the third rod (313) adjacent to the first rod (311), one end of the second rod (312) is rotatably connected with the movable rod (320), the other end of the second rod (312) is rotatably connected with an end portion of the third rod (313) adjacent to the second rod (312), and at least one fixed connection member (311) is located on the moving path (140).

7. The transmission mechanism (100) according to claim 6, wherein a first elongated hole (313 a) is provided in the middle of the third rod (313), the extending direction of the first elongated hole (313 a) is parallel to the moving direction of the movable rod (320), a limit rod (240) is provided on the protective cover (200), and the limit rod (240) is movably inserted into the first elongated hole (313 a).

8. A transmission mechanism (100) according to claim 1, wherein the edges of the protective covers (200) are provided with through slots (230), and the slot walls of the through slots (230) of two protective covers (200) surround the opening (120).

9. A transmission mechanism (100) according to claim 1 or 8, wherein the two opposite cavity walls of the accommodating cavity (110) are provided with the openings (120), the transmission assembly (300) is provided with two groups, and the movable rods (320) of the two groups of transmission assemblies (300) are respectively arranged in the two openings (120) in a penetrating manner.

10. A lock, characterized in that it comprises a transmission mechanism (100) according to any one of claims 1 to 9, and further comprises a mounting seat, said transmission assembly (300) is disposed on said mounting seat, a plug hole is disposed on said mounting seat, and said movable rod (320) is inserted into said plug hole.