An adjustable center distance striker assembly

Abstract

The application discloses a slanted tongue assembly with adjustable center distance, which comprises a first shell in the shape of a long strip, a rotating handle provided with a first cylinder part, a second shell provided with a second cylinder part coaxial with the first cylinder part, a spiral guide groove formed around the central axis of the first cylinder part on one of the first cylinder part and the second cylinder part, a guide cylinder provided on the other of the first cylinder part and the second cylinder part and penetrating into the spiral guide groove, a tongue body telescopically provided at the end of the second shell away from the first shell, a linkage rod group with one end capable of driving the tongue body to retract into the second shell, and a driving member provided with a first driving part and a second driving part staggered along the length direction and the circumferential direction of the first cylinder part, wherein the distance between the first driving part and the tongue body is greater than the distance between the second driving part and the tongue body.

Description

Technical Field

[0001] This invention relates to the field of lock-related technology, and in particular to an adjustable center distance latch assembly. 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. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the object of the present invention is to provide a tongue assembly for adjusting the center distance with a very simple structure, which is simple to operate and convenient to use.

[0005] According to an embodiment of the present invention, an adjustable center distance tongue assembly includes: a first elongated housing, in which a dial wheel is rotatably disposed, and the first housing having a first cylindrical portion extending along its length; a second housing, the second housing having a second cylindrical portion coaxially disposed with the first cylindrical portion, wherein the first cylindrical portion is sleeved on the outside of the second cylindrical portion, or the second cylindrical portion is sleeved on the outside of the first cylindrical portion; a helical guide groove formed around the central axis of the first cylindrical portion on the circumferential wall of one of the first cylindrical portion and the second cylindrical portion; a guide cylinder disposed on the other of the first cylindrical portion and passing through the helical guide groove; a tongue body telescopically disposed at the end of the second housing away from the first housing; and a linkage rod assembly movably disposed between the second cylindrical portion and the first cylindrical portion. One end of the linkage assembly can drive the tongue to retract into the second housing; a driving member is disposed between the dial and the other end of the linkage assembly, the driving member having a first driving part and a second driving part offset along the length direction and circumferential direction of the first cylindrical portion, the distance between the first driving part and the tongue is greater than the distance between the second driving part and the tongue; when the second cylindrical portion rotates relative to the first cylindrical portion in a first clockwise direction to move the guide cylinder to one end of the spiral guide groove, the first driving part contacts the linkage assembly to put the oblique tongue assembly in a first working position; when the second cylindrical portion rotates relative to the first cylindrical portion in a second clockwise direction to move the guide cylinder to the other end of the spiral guide groove, the second driving part contacts the linkage assembly to put the oblique tongue assembly in a second working position.

[0006] An adjustable center distance tongue assembly according to an embodiment of the present invention has at least the following beneficial effects:

[0007] When the center distance of the above-described tongue assembly needs to be adjusted, the second cylindrical part only needs to be driven to rotate relative to the central axis of the first cylindrical part. The guide cylinder can then move from one end of the spiral guide groove to the other end. During this process, the overall length of the first and second housings increases or decreases, and the driving component also rotates and extends relative to the linkage group. This allows the first driving part to contact the linkage group to place the tongue assembly in a first working position with a smaller center distance, or the second driving part to contact the linkage group to place the tongue assembly in a second working position with a larger center distance. This allows for the adjustment of the center distance of the tongue assembly with a very simple structure. The operation is simple and convenient. Moreover, when the tongue assembly is stabilized in the first or second working position by combining the spiral guide groove and the guide cylinder, the first and second housings cannot move when subjected to external force along the axial direction of the first cylindrical part, thus ensuring the reliability of the tongue assembly during operation.

[0008] In some embodiments of the present invention, the first cylindrical portion is sleeved on the outside of the second cylindrical portion, the spiral guide groove is formed on the first cylindrical portion, the guide cylinder protrudes from the outer peripheral wall of the second cylindrical portion to extend into the spiral guide groove, and both ends of the spiral guide groove are connected to arc positioning grooves extending around the circumference of the second cylindrical portion.

[0009] In some embodiments of the present invention, the projection of the entire assembly of the spiral guide groove and the two arc positioning grooves on the axial direction of the first cylindrical portion is a semi-circle, and the first driving portion and the second driving portion are arranged symmetrically about the axial center of the first cylindrical portion.

[0010] In some embodiments of the present invention, 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 a direction parallel to the extension and retraction of the tongue. The linkage assembly includes a push rod slidably disposed in the second housing along a direction parallel to the extension and retraction of 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 portion capable of pushing the driving member to move toward the tongue.

[0011] In some embodiments of the present invention, 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.

[0012] In some embodiments of the present invention, the first housing includes a side plate and a cover integrally formed with the side plate, and 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.

[0013] In some embodiments of the present invention, the upper and lower sides of the flat plate near the end of 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 end of the tongue are each formed with a second side ear that bends toward the cover. The two second side ears respectively constitute the first drive portion and the second drive 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.

[0014] In some embodiments of the present invention, the side of the cover is provided with a guide hole parallel to the sliding direction of the drive member, and one of the first side ears, the second side ears, or the third side ears has a guide member passing through the guide hole, and a second elastic member is connected between the guide hole and the guide member to drive the guide member to reset and move.

[0015] In some embodiments of the present invention, the second housing is provided with a mounting base inside one end near the driving member, the rotating arm is rotatably mounted on the mounting base via a pivot orthogonal to the second cylindrical portion, the mounting base is provided with a clearance groove for the rotating arm to reciprocate, the second housing is provided with a guide channel matching the push rod at one end near the driving member, the guide channel is connected to the clearance groove, the rotating arm is provided with a hook at one end away from the clearance groove, and the tongue is provided with a hook groove corresponding to the hook.

[0016] Additional aspects and advantages of the 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

[0017] The above or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the second housing in the first working position of one embodiment of the tongue assembly of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the second housing in the second working position according to the embodiment;

[0020] Figure 3 for Figure 1 A schematic diagram of the tongue retracted into the second housing in the embodiment;

[0021] Figure 4 for Figure 1 Schematic diagram of the internal structure after removing the first and second housings in the embodiment;

[0022] Figure 5 for Figure 1 Schematic diagram of structural breakdown of the embodiment.

[0023] Figure label:

[0024] First housing 100; first cylindrical portion 110; side plate 120; cover 130; guide hole 131; dial wheel 200; cam portion 210; cylinder 220; transmission groove 230; drive plane 240; second housing 300; second cylindrical portion 310; mounting base 320; guide channel 330; spiral guide groove 410; arc positioning groove 411; guide cylinder 420; tongue 500; first elastic element 510; hook groove 520; linkage rod assembly 600; push rod 610; rotating arm 620; pivot 621; hook portion 622; drive element 700; first drive portion 710; second drive portion 720; notch groove 730; first abutment portion 740; second abutment portion 750; guide element 751; sliding guide portion 760. Detailed Implementation

[0025] Embodiments of the present invention 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 the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "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 the invention and simplifying the description, and 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 the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0028] Reference Figures 1 to 5 According to an embodiment of the present invention, an adjustable center distance tongue assembly includes: a first elongated housing 100, wherein a dial 200 is rotatably disposed within the first housing 100, and the first housing 100 has a first cylindrical portion 110 extending along its length direction; and a second housing 300, wherein the second housing 300 has a second cylindrical portion 310 coaxially disposed with the first cylindrical portion 110, wherein the first cylindrical portion 110 is sleeved on the outside of the second cylindrical portion 310, or the second cylindrical portion 310 is sleeved on the first cylindrical portion 110. Externally, a spiral guide groove 410 is formed around the central axis of the first cylindrical portion 110 on the circumferential wall of one of the first cylindrical portion 110 and the second cylindrical portion 310; a guide cylinder 420 is disposed in the other of the first cylindrical portion 110 and the second cylindrical portion 310, and passes through the spiral guide groove 410; a tongue 500 is telescopically disposed at the end of the second housing 300 away from the first housing 100; and a linkage rod assembly 600 is movably disposed between the second cylindrical portion 310 and the first cylindrical portion 110. One end of the linkage assembly 600 can drive the tongue 500 to retract into the second housing 300; a driving member 700 is disposed between the dial 200 and the other end of the linkage assembly 600, the driving member 700 having a first driving part 710 and a second driving part 720 offset along the length direction and circumferential direction of the first cylindrical portion 110, the distance between the first driving part 710 and the tongue 500 is greater than the distance between the second driving part 720 and the tongue 500; when the second cylindrical portion 310 is opposite to When the first cylindrical portion 110 rotates in a first clockwise direction to move the guide cylinder 420 to one end of the spiral guide groove 410, the first driving portion 710 contacts the linkage rod group 600 to put the tongue assembly in a first working position; when the second cylindrical portion 310 rotates relative to the first cylindrical portion 110 in a second clockwise direction to move the guide cylinder 420 to the other end of the spiral guide groove 410, the second driving portion 720 contacts the linkage rod group 600 to put the tongue assembly in a second working position.

[0029] When the center distance of the tongue assembly with the above structure needs to be adjusted, it is only necessary to drive the second cylindrical part 310 to rotate relative to the central axis of the first cylindrical part 110. The guide cylinder 420 can then move from one end of the spiral guide groove 410 to the other end. During this process, the overall length of the first housing 100 and the second housing 300 becomes longer or shorter. The driving member 700 also rotates and extends relative to the linkage group 600, thereby allowing the first driving part 710 to contact the linkage group 600 to place the tongue assembly in a first working position with a smaller center distance, or allowing the second driving part 720 to contact the linkage group 600 to place the tongue assembly in a second working position with a larger center distance. This allows for the adjustment of the center distance of the tongue assembly with a very simple structure. The operation is simple and convenient. Moreover, when the tongue assembly is stabilized in the first or second working position by combining the spiral guide groove 410 and the guide cylinder 420, the first housing 100 and the second housing 300 cannot move when subjected to an external force along the axial direction of the first cylindrical part 110, thus ensuring the reliability of the tongue assembly during operation.

[0030] Taking two specifications of latch assembly with a center distance of 60mm and 70mm as examples, specifically, when the second cylindrical part 310 rotates to its position relative to the first cylindrical part 110 in the first clockwise direction, 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 driving part 710 abuts against one end of the linkage rod group 600. When the dial 200 rotates, it pushes the driving 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 cylindrical part 310 rotates to its position relative to the first cylindrical part 110 in the second clockwise direction, 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 driving part 720 abuts against one end of the linkage rod group 600. When the dial 200 rotates, it pushes the driving 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.

[0031] See Figure 1 and Figure 2In some embodiments of the present invention, the first cylindrical portion 110 is sleeved on the outside of the second cylindrical portion 310, the spiral guide groove 410 is formed on the first cylindrical portion 110, and the guide cylinder 420 protrudes from the outer peripheral wall of the second cylindrical portion 310 to extend into the spiral guide groove 410. In order to further improve stability and reliability and avoid the first housing 100 and the second housing 300 from generating rotational component force when subjected to external force along the axial direction of the first cylindrical portion 110, both ends of the spiral guide groove 410 are connected to arc positioning grooves 411 extending around the circumference of the second cylindrical portion 310.

[0032] Of course, in some embodiments, the following structure can also be used instead: the second cylindrical portion 310 is sleeved on the outside of the first cylindrical portion 110, the spiral guide groove 410 is formed on the second cylindrical portion 310, and correspondingly, the guide cylinder 420 protrudes from the outer peripheral wall of the first cylindrical portion 110 to extend into the spiral guide groove 410.

[0033] See Figure 5 In some embodiments of the present invention, the projection of the entire assembly of the spiral guide groove 410 and the two arc positioning grooves 411 on the axial direction of the first cylindrical portion 110 is a semi-circle. The first driving portion 710 and the second driving portion 720 are arranged symmetrically about the axial center of the first cylindrical portion 110. That is, the user can switch the tongue assembly from the first working position to the second working position, or switch the tongue assembly from the second working position to the first working position, by rotating the second housing 300 relative to the first housing 100 by 180°. 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 cylinder 420 and spiral guide groove 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 cylinder 420 and spiral guide groove 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 the present invention cleverly solves the above problems by simplifying the structure and making the drive component 700 and push rod 610 separable.

[0034] See Figure 4 and Figure 5In some embodiments of the present invention, 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 telescopic direction parallel to the tongue 500. The linkage group 600 includes a push rod 610 slidably disposed in the second housing 300 along a telescopic 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 capable of pushing the driving member 700 to move toward the tongue 500. 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 adjustment is completed, 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, which 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.

[0035] See Figures 3 to 5In some embodiments of the present invention, 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.

[0036] See Figure 5In some embodiments of the present invention, the first housing 100 includes a side plate 120 and a cover 130 integrally formed with the side plate 120. The side plate 120 and the cover 130 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 120. The flat plate portion is provided with a sliding guide portion 760 abutting against the inner sidewall of the cover 130. 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 120 is the same as the width of the flat plate. With the sliding guide 760 abutting against the inner wall of the cover 130, the flat plate slides horizontally along the inner wall of the side plate 120, 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.

[0037] See Figure 4 and Figure 5 In some embodiments of the present invention, 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 130. The two first side ears respectively constitute the first abutment portion 740 and the second abutment portion 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 130. The two second side ears respectively constitute the first drive portion 710 and the second drive portion 720. The sliding guide portion 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.

[0038] See Figure 1 and Figure 3In some embodiments of the present invention, 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 member 700 from exceeding a preset range, a guide hole 131 parallel to the sliding direction of the drive member 700 is provided on the side of the cover 130. One of the first side ears, the second side ear, or the third side ear has a guide member 751 passing through the guide hole 131. The guide hole 131 and the guide member 751... A second elastic element (not shown in the figure) is connected between 51 to drive the guide 751 to reset and move. That is, when the guide 751 moves along the guide hole 131 in the direction of compressing the second elastic element, the drive 700 pushes the push rod 610 to move in the direction close to the tongue 500. The rotation of the rotating arm 620 drives the tongue 500 to retract into the second housing 300. When the user no longer applies force to the wheel, the combined action of the first elastic element 510 and the second elastic element helps to quickly and stably drive each component to reset.

[0039] See Figure 5 In some embodiments of the present invention, the second housing 300 is provided with a mounting base 320 at one end near the drive member 700. The rotating arm 620 is rotatably mounted on the mounting base 320 via a pivot 621 orthogonal to the second cylindrical portion 310. The mounting base 320 is provided with a clearance groove (not shown in the figure) for the rotating arm 620 to reciprocate. The second housing 300 is provided with a guide channel 330 matching the push rod 610 at one end near the drive member 700. The guide channel 330 is connected to the clearance groove. The rotating arm 620 is provided with a hook portion 622 at one end away from the clearance groove. The tongue 500 is provided with a hook groove 520 corresponding to the hook portion 622.

[0040] 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 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.

[0041] Although embodiments of the 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 invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An adjustable center distance tongue assembly, characterized in that, include: The first housing (100) is elongated and has a dial (200) rotatably mounted inside it. The first housing (100) has a first cylindrical portion (110) extending along its length. The second housing (300) has a second cylindrical portion (310) coaxially disposed with the first cylindrical portion (110), wherein the first cylindrical portion (110) is sleeved on the outside of the second cylindrical portion (310), or the second cylindrical portion (310) is sleeved on the outside of the first cylindrical portion (110); A spiral guide groove (410) is formed on the circumferential wall of one of the first cylindrical portion (110) and the second cylindrical portion (310) around the central axis of the first cylindrical portion (110); A guide cylinder (420) is disposed in the other of the first cylindrical portion (110) and the second cylindrical portion (310), and passes through the spiral guide groove (410); 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 cylindrical part (310) and the first cylindrical part (110), and one end of the linkage assembly (600) can drive the tongue (500) to 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 circumferentially offset along the length direction of the first cylindrical part (110). The distance between the first drive part (710) and the tongue (500) is greater than the distance between the second drive part (720) and the tongue (500). The first cylindrical part (110) is sleeved on the outside of the second cylindrical part (310). The spiral guide groove (410) is formed on the first cylindrical part (110). The guide cylinder (420) protrudes from the outer peripheral wall of the second cylindrical part (310) and extends into the spiral guide groove (410). Both ends of the spiral guide groove (410) are connected to arc positioning grooves (411) extending around the circumference of the second cylindrical part (310). The projection of the entire assembly of the spiral guide groove (410) and the two arc positioning grooves (411) on the axial direction of the first cylindrical part (110) is a semi-circle, and the first driving part (710) and the second driving part (720) are arranged symmetrically about the axial center of the first cylindrical part (110). When the second cylindrical portion (310) rotates relative to the first cylindrical portion (110) in a first clockwise direction to move the guide cylinder (420) to one end of the spiral guide groove (410), the first driving portion (710) contacts the linkage group (600) to put the tongue assembly in a first working position; when the second cylindrical portion (310) rotates relative to the first cylindrical portion (110) in a second clockwise direction to move the guide cylinder (420) to the other end of the spiral guide groove (410), the second driving portion (720) contacts the linkage group (600) to put the tongue assembly in a second working position.

2. The adjustable center distance 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. The adjustable center distance tongue 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 two notches on the side near the dial (200). The driving plane (240) corresponds to the first abutment (740) and the 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. The adjustable center distance tongue assembly according to claim 3, characterized in that, The first housing (100) includes a side plate (120) and a cover (130) integrally formed with the side plate (120). The side plate (120) and the cover (130) 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 wall of the side plate (120). The flat plate portion is provided with a sliding guide portion (760) abutting against the inner wall of the cover (130). 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. The adjustable center distance tongue assembly according to claim 4, characterized in that, The upper and lower sides of the flat plate near the dial (200) are both formed with first side ears that bend toward the cover (130). 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 both formed with second side ears that bend toward the cover (130). 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. The adjustable center distance tongue assembly according to claim 5, characterized in that, The side of the cover (130) is provided with a guide hole (131) parallel to the sliding direction of the drive member (700), and one of the first side ears, the second side ear, or the third side ear has a guide member (751) passing through the guide hole (131). A second elastic member is connected between the guide hole (131) and the guide member (751) to drive the guide member (751) to reset and move.

7. The adjustable center distance tongue assembly according to claim 2, characterized in that, The second housing (300) has a mounting base (320) inside the end near the drive member (700). The rotating arm (620) is rotatably mounted on the mounting base (320) via a pivot (621) orthogonal to the second cylindrical part (310). The mounting base (320) has a clearance groove inside for the rotating arm (620) to reciprocate. The second housing (300) has a guide channel (330) matching the push rod (610) at the end near the drive member (700). The guide channel (330) is connected to the clearance groove. The rotating arm (620) has a hook (622) at the end away from the clearance groove. The tongue (500) has a hook groove (520) corresponding to the hook (622).

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