Latch bolt assembly and lock

Abstract

The utility model discloses a latch bolt assembly and a lockset, both comprising: a strip-shaped first housing, which is rotatably provided with a dial wheel; the second shell can telescopically move in the length direction of the first shell and rotate around the axis of the first shell, the second shell retracts relative to the first shell and rotates in the first hour hand direction so as to be located at the first working position, and the second shell stretches out relative to the first shell and rotates in the second hour hand direction so as to be located at the second working position; the rotary positioning mechanism can stabilize the second shell at the first working position or the second working position; the tongue body is telescopically arranged on the second shell; the linkage rod group is used for driving the tongue body to stretch out and draw back in the second shell; the driving piece is provided with a first driving part and a second driving part which are arranged in a staggered manner; the second shell rotates and telescopically moves relative to the first shell to adjust the overall length of the latch bolt assembly, meanwhile, the driving piece rotates to the first driving part or the second driving part to make contact with the linkage rod set, the center distance is very easily adjusted, operation is easy, and use is convenient.

Description

Technical Field

[0001] This utility model relates to the field of lock-related technology, and in particular to a latch assembly and a lock. Background Technology

[0002] The latch assembly is the main mechanism for opening and closing a door lock. Different center distances between the latch wheel and the latch body result in different installation specifications for the latch assembly. Currently, the commonly used center distances for latch assemblies are 60mm and 70mm. In existing lock latches, the length is generally fixed and cannot be adjusted, making it unsuitable for installations with different center distance requirements.

[0003] Among them, the tongue of the oblique tongue assembly has two types: oblique tongue and rigid tongue. Since the rigid tongue does not use a spring mechanism, an adjustment mechanism for adjusting the center distance of the rigid tongue has appeared in related technologies. However, the structure of the adjustment mechanism is complicated, often requiring professional personnel to install and debug it, making it troublesome to use. It is also prone to jamming during adjustment and has poor stability. Moreover, since the oblique tongue uses a spring mechanism, this adjustment mechanism cannot be adapted to the oblique tongue assembly. Therefore, there is currently no oblique tongue assembly that can adjust the center distance of the oblique tongue. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of this utility model is to provide a latch assembly with a very simple structure for adjusting the center distance of the latch, which is simple to operate and convenient to use; the second objective is to provide a lock using the above-mentioned latch assembly.

[0005] A tongue assembly according to a first aspect of the present invention includes: a first elongated housing, the first housing being rotatably provided with a dial wheel; a second housing, capable of telescopic movement along the length direction of the first housing and rotation about the axis of the first housing, the second housing being retracted relative to the first housing and rotating in a first clockwise direction to a first working position, and the second housing being extended relative to the first housing and rotating in a second clockwise direction to a second working position; a rotation positioning mechanism disposed between the second housing and the first housing, capable of stabilizing the second housing in the first working position or the second working position; a tongue, telescopically disposed at one end of the second housing away from the first housing; a linkage group movably disposed between the second housing and the first housing, one end of the linkage group being used to drive the tongue to extend out of or retract into the second housing; a driving member disposed between the dial wheel and the other end of the linkage group, the driving member having a first driving part and a second driving part offset along the length direction and circumferentially of the first housing; when the second housing is in the first working position, the first driving part contacts the linkage group; when the second housing is in the second working position, the second driving part contacts the linkage group.

[0006] A tongue assembly according to an embodiment of the present utility model has at least the following beneficial effects:

[0007] When the center distance of the above-described tongue assembly needs to be adjusted, the overall length of the tongue assembly is adjusted by driving the second housing to rotate relative to the first housing and to move telescopically. At the same time, the drive unit rotates until the first drive part or the second drive part contacts the linkage group, which can drive the tongue to move telescopically. Thus, the center distance of the tongue assembly can be adjusted in a very simple structure. It is easy to operate and convenient to use. Moreover, when the second housing is stabilized in the first or second working position by the rotation positioning mechanism, the second housing cannot move when it is only subjected to external force in the telescopic direction, thereby ensuring the reliability of the tongue assembly during operation.

[0008] In some embodiments of this utility model, the tongue is connected to a first elastic member that drives it to extend out of the second housing. The driving member is slidably disposed in the first housing along the extension and retraction direction parallel to the tongue. The linkage assembly includes a push rod slidably disposed in the second housing along the extension and retraction direction parallel to the tongue and a rotating arm rotatably disposed in the second housing. One end of the rotating arm is movably connected to the tongue, and the other end of the rotating arm abuts against one end of the push rod. The other end of the push rod abuts against the first driving part or the second driving part. The dial has a cam part that can push the driving member to move toward the tongue.

[0009] In some embodiments of this utility model, the dial wheel includes a cylinder with a transmission groove in the middle. The cam portion is formed on the outer peripheral wall of the cylinder and is in the shape of a small cut circle. The cam portion and the cylinder have two coplanar driving planes at their two junctions. The driving member has a notch corresponding to the cylinder. The side of the driving member near the dial wheel has a first abutment portion and a second abutment portion corresponding to the two driving planes respectively. The first driving portion is located on the side of the driving member opposite to the first abutment portion, and the second driving portion is located on the side of the driving member opposite to the second abutment portion. The distance between the first driving portion and the first abutment portion is smaller than the distance between the second driving portion and the second abutment portion.

[0010] In some embodiments of this utility model, the first housing includes a side plate and a cover integrally formed with the side plate. The side plate and the cover define an accommodating space for accommodating the dial and the drive member. The drive member includes a flat plate portion abutting against the inner sidewall of the side plate. The flat plate portion is provided with a sliding guide portion abutting against the inner sidewall of the cover. The first abutting portion and the second abutting portion are respectively formed on the upper and lower sides of the flat plate portion near the end of the dial. The first drive portion and the second drive portion are respectively formed on the upper and lower sides of the flat plate portion near the end of the tongue.

[0011] In some embodiments of this utility model, the upper and lower sides of the flat plate near the dial are each formed with a first side ear that bends toward the cover. The two first side ears respectively constitute the first abutment portion and the second abutment portion. The upper and lower sides of the flat plate near the tongue are each formed with a second side ear that bends toward the cover. The two second side ears respectively constitute the first driving portion and the second driving portion. The sliding guide portion is a third side ear formed between the first side ear and the second side ear. The flat plate, the first side ear, the second side ear and the third side ear are an integral structure.

[0012] In some embodiments of this utility model, one of the first housing and the second housing has a first cylindrical portion, and the other has a second cylindrical portion coaxially sleeved on the first cylindrical portion. The rotation positioning mechanism includes a spiral guide groove formed on the outer peripheral wall of the second cylindrical portion and a guide post protruding from the outer peripheral wall of the first cylindrical portion and extending into the spiral guide groove. The guide post moves to one end of the spiral guide groove so that the second housing is in the first working position or the second working position.

[0013] In some embodiments of this utility model, both ends of the spiral guide groove are connected to arc positioning grooves extending around the circumference of the second cylindrical part. The projection of the spiral guide groove and the two arc positioning grooves as a whole on the axial direction of the second cylindrical part is a semi-circle. The first driving part and the second driving part are arranged symmetrically about the axis of the second cylindrical part.

[0014] In some embodiments of this utility model, one of the first housing and the second housing has a first cylindrical portion, and the other has a second cylindrical portion coaxially sleeved on the first cylindrical portion. The rotation positioning mechanism includes a stepped guide groove formed on the outer peripheral wall of the second cylindrical portion and a guide protrusion protruding from the outer peripheral wall of the first cylindrical portion and extending into the stepped guide groove. The stepped guide groove includes a first arc groove and a second arc groove extending around the circumference of the second cylindrical portion. The first arc groove and the second arc groove are arranged at intervals along the length direction of the second cylindrical portion. One end of the first arc groove and one end of the second arc groove are connected by a straight connecting groove arranged parallel to the second cylindrical portion. The other end of the first arc groove and the other end of the second arc groove are arranged opposite to each other in the circumferential direction of the second cylindrical portion.

[0015] In some embodiments of this utility model, the projection of the stepped guide groove on the axial direction of the second cylindrical part is a semi-circle, and the first driving part and the second driving part are arranged symmetrically about the axis of the second cylindrical part.

[0016] According to a second aspect embodiment of the present invention, a lock includes a latch assembly employing any of the above-described technical solutions. The lock using the latch assembly adjusts the center distance by rotating and extending / retracting. While the second housing rotates relative to the first housing, the linkage group is switched to contact the first or second driving part. The structure is very simple, operation is straightforward, and it is convenient to use. Furthermore, the latch assembly cannot move when subjected only to external force in the extension / retraction direction, thus ensuring the reliability of the latch assembly during operation.

[0017] Additional aspects and advantages of this invention 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 invention. Attached Figure Description

[0018] The above or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the second housing in the first working position of the first embodiment of the tongue assembly of this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the second housing in the second working position according to the embodiment;

[0021] Figure 3 for Figure 1 A schematic diagram of the tongue retracted into the second housing in the embodiment;

[0022] Figure 4 for Figure 1 Schematic diagram of the internal structure after removing the first and second housings in the embodiment;

[0023] Figure 5 for Figure 1 Schematic diagram of the structural breakdown of the embodiment;

[0024] Figure 6 This is a schematic diagram of the second housing in the first working position of the second embodiment of the oblique tongue assembly of this utility model;

[0025] Figure 7 for Figure 6 A schematic diagram of the second housing in the second working position according to the embodiment.

[0026] Figure label:

[0027] First housing 100; side plate 110; cover 120; second cylindrical part 130; dial wheel 200; cam part 210; cylinder 220; transmission groove 230; drive plane 240; second housing 300; first cylindrical part 310; rotary positioning mechanism 400; spiral guide groove 410; arc positioning groove 411; guide post 420; stepped guide groove 430; first arc groove 431; second arc groove 432; straight connecting groove 433; guide protrusion 440; tongue 500; first elastic element 510; linkage rod assembly 600; push rod 610; rotating arm 620; drive element 700; first drive part 710; second drive part 720; notch groove 730; first abutment part 740; second abutment part 750; sliding guide part 760. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Reference Figures 1 to 4According to an embodiment of the present invention, a tongue assembly includes: a long, narrow first housing 100, the first housing 100 being rotatably provided with a dial 200; a second housing 300, capable of telescopic movement along the length of the first housing 100 and rotation about the axis of the first housing 100, wherein the second housing 300 is retracted relative to the first housing 100 and rotates in a first clockwise direction to a first working position, and the second housing 300 is extended relative to the first housing 100 and rotates in a second clockwise direction to a second working position; a rotation positioning mechanism 400, disposed between the second housing 300 and the first housing 100, capable of stabilizing the second housing 300 in the first working position or the second working position; and a tongue 500, telescopically disposed at the distance from the second housing 300. One end of the first housing 100 is located away from the second housing 300; a linkage rod assembly 600 is movably disposed between the second housing 300 and the first housing 100, one end of the linkage rod assembly 600 is used to drive the tongue 500 to extend out of or retract into the second housing 300; a driving member 700 is disposed between the dial 200 and the other end of the linkage rod assembly 600, the driving member 700 has a first driving part 710 and a second driving part 720 that are offset along the length direction and circumferential direction of the first housing 100; when the second housing 300 is in the first working position, the first driving part 710 contacts the linkage rod assembly 600; when the second housing 300 is in the second working position, the second driving part 720 contacts the linkage rod assembly 600.

[0032] When the center distance of the above-described tongue assembly needs to be adjusted, the overall length of the tongue assembly is adjusted by driving the second housing 300 to rotate relative to the first housing 100 and to move telescopically. At the same time, the drive member 700 rotates until the first drive part 710 or the second drive part 720 contacts the linkage rod group 600, which can drive the tongue 500 to move telescopically. Thus, the center distance of the tongue assembly can be adjusted in a very simple structure. It is easy to operate and convenient to use. Moreover, when the second housing 300 is stabilized in the first working position or the second working position by the rotation positioning mechanism 400, the second housing 300 cannot move when it is only subjected to external force in the telescopic direction, thereby ensuring the reliability of the tongue assembly during operation. Taking two specifications of latch assembly with a center distance of 60mm and 70mm as examples, specifically, when the second housing 300 rotates relative to the first housing 100 in a first clockwise direction to the first working position, the second housing 300 retracts relative to the first housing 100, adjusting the center distance of the latch assembly to 60mm. At this time, the first drive unit 710 abuts against one end of the linkage rod group 600. When the dial 200 rotates, it pushes the drive member 700 to move towards the tongue body 500, thereby driving the tongue body 500 to retract through the linkage rod group 600, thus achieving unlocking. When the second housing 300 rotates relative to the first housing 100 in a second clockwise direction to the second working position, the second housing 300 extends relative to the first housing 100, adjusting the center distance of the latch assembly to 70mm. At this time, the second drive unit 720 abuts against one end of the linkage rod group 600. When the dial 200 rotates, it pushes the drive member 700 to move towards the tongue body 500, thus achieving unlocking. Among them, one of the first and second clockwise directions is clockwise, and the other is counterclockwise.

[0033] See Figure 4 and Figure 5In some embodiments of this utility model, the tongue 500 is connected to a first elastic member 510 that drives it to extend out of the second housing 300. The driving member 700 is slidably disposed in the first housing 100 along a direction parallel to the extension and retraction of the tongue 500. The linkage assembly 600 includes a push rod 610 slidably disposed in the second housing 300 along a direction parallel to the extension and retraction of the tongue 500 and a rotating arm 620 rotatably disposed in the second housing 300. One end of the rotating arm 620 is movably connected to the tongue 500, and the other end of the rotating arm 620 abuts against one end of the push rod 610. The other end of the push rod 610 abuts against the first driving part 710 or the second driving part 720. The dial 200 has a cam part 210 capable of pushing the driving member 700 toward the tongue 500. In this embodiment, the end of the rotating arm 620 away from the push rod 610 is provided with a hook, and the tongue 500 has a hook groove adapted to the hook. Understandably, when the dial 200 is not rotating, the tongue 500 remains extended beyond the second housing 300 under the action of the first elastic member 510. When the second housing 300 rotates relative to the first housing 100, the drive member 700 also rotates relative to the linkage group 600. If the push rod 610 was originally in contact with the first drive part 710, it can be moved to the second drive part 720 after rotation. After the center distance is adjusted, the various components remain in contact. Specifically, when the dial 200 rotates, the cam part 210 pushes the drive member 700 to move towards the tongue 500. The drive member 700 pushes the push rod 610 towards the tongue 500 through the first drive part 710 or the second drive part 720. The push rod 610 then drives the rotation of the rotating arm 620. The hook of the rotating arm 620 hooks the groove of the tongue 500 and drags the tongue 500 back. The above-mentioned drive component 700 and linkage rod group 600 have a very simple structure and simple linkage method. Moreover, during the rotation and extension of the second housing 300 relative to the first housing 100, the drive component 700 and the push rod 610 first separate and then contact each other. There is no need to configure a locking and unlocking structure, which greatly simplifies the structural design that can realize center distance adjustment.

[0034] See Figure 4 and Figure 5In some embodiments of this utility model, the dial 200 includes a cylinder 220, a transmission groove 230 is provided in the middle of the cylinder 220, the cam portion 210 is formed on the outer peripheral wall of the cylinder 220 and is in the shape of a small cut circle, the two junctions of the cam portion 210 and the cylinder 220 are respectively provided with coplanar driving planes 240, the driving member 700 has a notch 730 corresponding to the cylinder 220, the driving member 700 is provided with a first abutting portion 740 and a second abutting portion 750 corresponding to the two driving planes 240 on the side near the dial 200, the first driving portion 710 is provided on the side of the driving member 700 opposite to the first abutting portion 740, the second driving portion 720 is provided on the side of the driving member 700 opposite to the second abutting portion 750, and the distance between the first driving portion 710 and the first abutting portion 740 is less than the distance between the second driving portion 720 and the second abutting portion 750. It is understandable that when the tongue 500 extends out of the second housing 300, the first abutment 740 and the second abutment 750 simultaneously contact the two driving surfaces 240, preventing the dial 200 from rotating easily. The square rod of the door lock passes through the transmission groove 230. When the square rod drives the dial 200 to rotate clockwise or counterclockwise, the cam 210 contacts the first abutment 740 or the second abutment 750 to push the drive member 700 and the push rod 610 to move, thereby driving the tongue 500 to retract and unlock. That is, the dial 200 can unlock by rotating a small angle clockwise or counterclockwise. In this embodiment, in order to limit the rotation angle of the dial 200, the side wall of the first housing 100 is provided with an arcuate hole surrounding the cylinder 220 along its axial direction and a protrusion provided on the dial 200 and sliding back and forth in the arcuate hole.

[0035] See Figure 4 and Figure 5In some embodiments of this utility model, the first housing 100 includes a side plate 110 and a cover 120 integrally formed with the side plate 110. The side plate 110 and the cover 120 define an accommodating space for accommodating the dial 200 and the drive member 700. The drive member 700 includes a flat plate portion abutting against the inner sidewall of the side plate 110. The flat plate portion is provided with a sliding guide portion 760 abutting against the inner sidewall of the cover 120. The first abutting portion 740 and the second abutting portion 750 are respectively formed on the upper and lower sides of the flat plate portion near the end of the dial 200. The first drive portion 710 and the second drive portion 720 are respectively formed on the upper and lower sides of the flat plate portion near the end of the tongue 500. Specifically, the width of the side plate 110 is the same as the width of the flat plate. With the sliding guide 760 abutting against the inner wall of the cover 120, the flat plate slides horizontally along the inner wall of the side plate 110, thus eliminating the need for a separate slide rail structure. Furthermore, the first abutting part 740, the second abutting part 750, the first driving part 710, and the second driving part 720 are respectively formed on the flat plate, which helps to further reduce the number of parts and simplify the production process.

[0036] See Figure 4 and Figure 5 In some embodiments of this utility model, the upper and lower sides of the flat plate near the end of the dial 200 are formed with first side ears that bend toward the cover 120. The two first side ears respectively constitute the first abutment 740 and the second abutment 750. The upper and lower sides of the flat plate near the end of the tongue 500 are formed with second side ears that bend toward the cover 120. The two second side ears respectively constitute the first drive part 710 and the second drive part 720. The sliding guide part 760 is a third side ear formed between the first side ear and the second side ear. The flat plate, the first side ear, the second side ear and the third side ear are an integral structure. The drive member 700 composed of the flat plate, the first side ear, the second side ear and the third side ear can be obtained by integral stamping of sheet metal parts, integral injection molding of plastic parts, integral casting, etc.

[0037] See Figure 3 and Figure 4In some embodiments, when the user no longer applies force to rotate the dial 200, in order to automatically reset the rotation angle of the dial 200 and prevent the sliding stroke of the drive component 700 from exceeding the preset range, the side of the cover 120 is provided with a guide hole parallel to the sliding direction of the drive component 700. One of the first side ears, the second side ear, or the third side ear has a guide component passing through the guide hole. A second elastic component is connected between the guide hole and the guide component to drive the guide component to reset. That is, when the guide component moves along the guide hole in the direction of compressing the second elastic component, the drive component 700 pushes the push rod 610 to move towards the tongue 500. The rotation of the rotating arm 620 drives the tongue 500 to retract towards the second housing 300. When the user no longer applies force to the dial, under the action of the first elastic component 510 and the second elastic component, each component resets.

[0038] See Figure 1 and Figure 2 In some embodiments of this utility model, one of the first housing 100 and the second housing 300 has a first cylindrical portion 310, and the other has a second cylindrical portion 130 coaxially sleeved on the first cylindrical portion 310. The rotary positioning mechanism 400 includes a spiral guide groove 410 formed on the outer peripheral wall of the second cylindrical portion 130 and a guide post 420 protruding from the outer peripheral wall of the first cylindrical portion 310 and extending into the spiral guide groove 410. The guide post 420 moves to one end of the spiral guide groove 410 so that the second housing 300 is in the first working position or the second working position. Understandably, when the center distance of the tongue assembly needs to be adjusted, the user grasps the first housing 100 and the second housing 300 with both hands, and then drives the first housing 100 and the second housing 300 to rotate relative to each other around the central axis of the first cylindrical portion 310. At this time, the guide post 420 moves from one end of the spiral guide groove 410 to the other end. During this process, the first housing 100 and the second housing 300 not only rotate relative to each other, but also extend and retract relative to each other, thereby conveniently adjusting the center distance of the tongue assembly. Furthermore, when the first housing 100 or the second housing 300 is not subjected to torque, the relative position between the guide post 420 and the spiral guide groove 410 remains unchanged.

[0039] See Figure 1 and Figure 2In some embodiments of this utility model, in order to further improve stability and reliability and avoid the generation of rotational component force when the first housing 100 and the second housing 300 are subjected to external force along the axial direction of the first cylindrical portion 310, both ends of the spiral guide groove 410 are connected to arc positioning grooves 411 extending around the circumference of the second cylindrical portion 130. The projection of the spiral guide groove 410 and the two arc positioning grooves 411 on the axial direction of the second cylindrical portion 130 is semi-circular. The first driving part 710 and the second driving part 720 are symmetrically arranged about the axis of the second cylindrical portion 130, that is, rotating 180° can switch the second housing 300 from the first working position to the second working position, or switch the second housing 300 from the second working position to the first working position. Furthermore, it is particularly important to note that in traditional technology, the latch does not employ a spring mechanism. Some latches also use a combination of guide posts 420 and spiral guide grooves 410 to achieve center distance adjustment. However, in order to ensure that the internal transmission structure of the latch can move, another set of guide posts 420 and spiral guide grooves 410 needs to be set between the latch body 500 and the second housing 300, which leads to problems such as complex assembly, high precision requirements, and easy jamming. The technical solution of this utility model solves the above problems by simplifying the structure and making the drive component 700 and the push rod 610 separable.

[0040] See Figure 6 and Figure 7In some embodiments of this utility model, one of the first housing 100 and the second housing 300 has a first cylindrical portion 310, and the other has a second cylindrical portion 130 coaxially sleeved on the first cylindrical portion 310. The rotary positioning mechanism 400 includes a stepped guide groove 430 formed on the outer peripheral wall of the second cylindrical portion 130 and a guide protrusion 440 protruding from the outer peripheral wall of the first cylindrical portion 310 and extending into the stepped guide groove 430. The stepped guide groove 430 includes a guide protrusion 440 surrounding the second cylindrical portion 310. A first arc groove 431 and a second arc groove 432 extend in the circumferential direction of the cylindrical portion 130. The first arc groove 431 and the second arc groove 432 are arranged at intervals along the length direction of the second cylindrical portion 130. One end of the first arc groove 431 and one end of the second arc groove 432 are connected by a straight connecting groove 433 provided parallel to the second cylindrical portion 130. The other end of the first arc groove 431 and the other end of the second arc groove 432 are arranged opposite to each other in the circumferential direction of the second cylindrical portion 130. Compared to the previous embodiment where only the spiral guide groove and guide post are replaced with a stepped guide groove and a guide protrusion respectively, it can be understood that when the center distance of the tongue assembly needs to be adjusted, the user holds the first housing 100 and the second housing 300 with both hands respectively, and then drives the first housing 100 and the second housing 300 to rotate relative to each other around the central axis of the first cylindrical portion 310 by a small angle. At this time, the guide protrusion 440 moves from the first arc groove 431 to the direct connecting groove 433, and then moves the guide protrusion 440 from the direct connecting groove 433 to the second arc groove 432. Then, the first housing 100 and the second housing 300 continue to be driven to rotate relative to each other around the central axis of the first cylindrical portion 310 until the guide protrusion 440 moves to the end of the second arc groove 432. At this time, the center distance of the tongue assembly can be adjusted.

[0041] In some embodiments of this utility model, the projection of the stepped guide groove 430 on the axial direction of the second cylindrical part 130 is semi-circular. The first driving part 710 and the second driving part 720 are symmetrically arranged about the axis of the second cylindrical part 130. That is, rotating 180° can switch the second housing 300 from the first working position to the second working position, or switch the second housing 300 from the second working position to the first working position. At this time, the transmission groove 230 of the dial 200 is still in a horizontal arrangement so that the square bar of the door lock can pass through.

[0042] This utility model also discloses a lock, including a latch assembly employing any of the above-mentioned technical solutions. The lock employing the above latch assembly adjusts the center distance by rotating and extending / retracting. While the second housing 300 rotates relative to the first housing 100, the linkage group 600 is switched to contact with the first drive unit 710 or the second drive unit 720. The structure is very simple, operation is straightforward, and use is convenient. Furthermore, the latch assembly cannot move when subjected only to external force in the extension / retraction direction, thus ensuring the reliability of the latch assembly during operation.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A tongue-and-groove assembly, characterized in that, include: A long, narrow first housing (100) is provided with a rotatable dial (200); The second housing (300) is capable of telescopic movement along the length direction of the first housing (100) and rotation about the axis of the first housing (100). The second housing (300) is retracted relative to the first housing (100) and rotated in a first clockwise direction to be in a first working position. The second housing (300) is extended relative to the first housing (100) and rotated in a second clockwise direction to be in a second working position. A rotary positioning mechanism (400) is disposed between the second housing (300) and the first housing (100), which can stabilize the second housing (300) in the first working position or the second working position; The tongue (500) is telescopically located at the end of the second housing (300) away from the first housing (100); A linkage assembly (600) is movably disposed between the second housing (300) and the first housing (100). One end of the linkage assembly (600) is used to drive the tongue (500) to extend out of the second housing (300) or retract into the second housing (300). A drive member (700) is disposed between the dial (200) and the other end of the linkage group (600). The drive member (700) has a first drive part (710) and a second drive part (720) that are offset along the length direction and circumferential direction of the first housing (100). When the second housing (300) is in the first working position, the first drive unit (710) contacts the linkage group (600); when the second housing (300) is in the second working position, the second drive unit (720) contacts the linkage group (600).

2. The oblique tongue assembly according to claim 1, characterized in that, The tongue (500) is connected to a first elastic member (510) that drives it to extend out of the second housing (300). The driving member (700) is slidably disposed in the first housing (100) along the extension and retraction direction parallel to the tongue (500). The linkage group (600) includes a push rod (610) slidably disposed in the second housing (300) along the extension and retraction direction parallel to the tongue (500) and a rotating arm (620) rotatably disposed in the second housing (300). One end of the rotating arm (620) is movably connected to the tongue (500), and the other end of the rotating arm (620) abuts against one end of the push rod (610). The other end of the push rod (610) abuts against the first driving part (710) or the second driving part (720). The dial (200) has a cam part (210) that can push the driving member (700) to move toward the tongue (500).

3. A tongue-and-groove assembly according to claim 2, characterized in that, The dial (200) includes a cylinder (220) with a transmission groove (230) in the middle. The cam portion (210) is formed on the outer peripheral wall of the cylinder (220) and is small-circular. The cam portion (210) and the cylinder (220) have coplanar driving planes (240) at their two junctions. The driving member (700) has a notch (730) corresponding to the cylinder (220). The driving member (700) has a notch (730) on the side near the dial (200) corresponding to the two cylinders. The driving plane (240) corresponds to a first abutment (740) and a second abutment (750). The first driving part (710) is located on the side of the driving member (700) opposite to the first abutment (740), and the second driving part (720) is located on the side of the driving member (700) opposite to the second abutment (750). The distance between the first driving part (710) and the first abutment (740) is smaller than the distance between the second driving part (720) and the second abutment (750).

4. A tongue-and-groove assembly according to claim 3, characterized in that, The first housing (100) includes a side plate (110) and a cover (120) integrally formed with the side plate (110). The side plate (110) and the cover (120) define an accommodating space for accommodating the dial (200) and the drive member (700). The drive member (700) includes a flat plate portion abutting against the inner sidewall of the side plate (110). The flat plate portion is provided with a sliding guide portion (760) abutting against the inner sidewall of the cover (120). The first abutting portion (740) and the second abutting portion (750) are respectively formed on the upper and lower sides of the flat plate portion near the end of the dial (200). The first drive portion (710) and the second drive portion (720) are respectively formed on the upper and lower sides of the flat plate portion near the end of the tongue (500).

5. A tongue-and-groove assembly according to claim 4, characterized in that, The upper and lower sides of the flat plate near the dial (200) are each formed with a first side ear that bends toward the cover (120). The two first side ears respectively constitute the first abutment (740) and the second abutment (750). The upper and lower sides of the flat plate near the tongue (500) are each formed with a second side ear that bends toward the cover (120). The two second side ears respectively constitute the first drive part (710) and the second drive part (720). The sliding guide part (760) is a third side ear formed between the first side ear and the second side ear. The flat plate, the first side ear, the second side ear and the third side ear are an integral structure.

6. A tongue-and-groove assembly according to claim 1, characterized in that, One of the first housing (100) and the second housing (300) has a first cylindrical portion (310), and the other has a second cylindrical portion (130) coaxially sleeved on the first cylindrical portion (310). The rotary positioning mechanism (400) includes a spiral guide groove (410) formed on the outer peripheral wall of the second cylindrical portion (130) and a guide post (420) protruding from the outer peripheral wall of the first cylindrical portion (310) and extending into the spiral guide groove (410). The guide post (420) moves to one end of the spiral guide groove (410) so that the second housing (300) is in the first working position or the second working position.

7. A tongue-and-groove assembly according to claim 6, characterized in that, Both ends of the spiral guide groove (410) are connected to arc positioning grooves (411) extending around the circumference of the second cylindrical part (130). The projection of the spiral guide groove (410) and the two arc positioning grooves (411) on the axial direction of the second cylindrical part (130) is a semi-circle. The first driving part (710) and the second driving part (720) are arranged symmetrically about the axis of the second cylindrical part (130).

8. A tongue-and-groove assembly according to claim 1, characterized in that, One of the first housing (100) and the second housing (300) has a first cylindrical portion (310), and the other has a second cylindrical portion (130) coaxially sleeved on the first cylindrical portion (310). The rotary positioning mechanism (400) includes a stepped guide groove (430) formed on the outer peripheral wall of the second cylindrical portion (130) and a guide protrusion (440) protruding from the outer peripheral wall of the first cylindrical portion (310) and extending into the stepped guide groove (430). The stepped guide groove (430) includes a portion surrounding the second cylindrical portion (130). The first arc groove (431) and the second arc groove (432) extend in the circumferential direction. The first arc groove (431) and the second arc groove (432) are arranged at intervals along the length direction of the second cylindrical part (130). One end of the first arc groove (431) and one end of the second arc groove (432) are connected by a straight connecting groove (433) provided parallel to the second cylindrical part (130). The other end of the first arc groove (431) and the other end of the second arc groove (432) are arranged opposite to each other in the circumferential direction of the second cylindrical part (130).

9. A tongue-and-groove assembly according to claim 8, characterized in that, The projection of the stepped guide groove (430) onto the axial direction of the second cylindrical part (130) is semi-circular, and the first driving part (710) and the second driving part (720) are arranged symmetrically about the axis of the second cylindrical part (130).

10. A lock, characterized in that, Includes a tongue assembly according to any one of claims 1-9.

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