TWI829051B - Locking device and quick locking assembly applying the locking device - Google Patents

Abstract

A locking device includes a casing, a worm gear, a fine-tuning gear, a linkage gear, a positioning block and positioning post. The first plate of the casing is provided with a slot, and the first side wall is provided with an opening. The fine-turning gear is installed in the slot. The worm gear is meshed with the fine-turning gear and the linkage gear. The positioning block is provided with a sliding groove. The positioning post is penetrated in the through hole of the linkage gear and the sliding groove. One end of the positioning post contacts the first plate, and position of the other end is limited by the positioning block. Part of the positioning post is exposed to the opening. When the first fine-tuning gear is rotated under force, it drives the worm gear to rotate and moves the first interlocking gear to change the position in the sliding groove and the tilting angle of the positioning post.

Description

Locking firmware and quick locking assembly using the locking firmware

The invention relates to the field of display, and in particular to a locking component and a quick locking assembly using the locking component.

In the prior art, when assembling large panels, such as LED light panels, advertising billboards, etc., quick locking assemblies are often used for assembly. The quick locking assemblies include pairs of fasteners and hook locks. The fasteners It has a fixed shaft and a hook-lock part with a rotatable hook-lock part. The two are assembled and fixed, which can achieve the advantages of fast construction speed and easy assembly and disassembly.

However, with the current design changes, for example, LED display screens are often spliced with curved surfaces, such as arcs and spheres. If the quick locking assembly is used in multi-angle and three-dimensional applications, it may be affected by the angle. Restricted and loosened, it cannot be used. It must be changed to other types of hardware, or additional assembly tabs are added to the shell and cabinet of the quick-lock assembly, but such as corner frame locks or additional assembly tabs. There may be accuracy issues at different angles, and seams are easy to occur. In addition, even if the accuracy is improved, there are still problems such as time-consuming assembly and increased difficulty in assembly and disassembly.

In order to solve the problems faced by the prior art, a locking component is provided. The locking member includes a first housing, a first worm, a first fine-tuning gear, a first linking gear, positioning and positioning hook posts.

The first housing includes a first plate, a second plate, a first side wall and a second side wall. The first plate member and the second plate member are opposite to each other, the first side wall and the second side wall are opposite to each other, and are connected to the first plate member and the second plate member on both sides respectively. The first plate member is provided with a first slot, and the first side wall is provided with a first opening. An accommodation space is formed between the first plate member, the second plate member, the first side wall and the second side wall. The first worm is fixedly connected to the first side wall and the second side wall and is adjacent to the first plate. The first fine-tuning gear is installed in the first slot and meshes with the first side of the first worm. The first linkage gear is located in the accommodation space and meshes with the second side of the first worm, and the second side is generally orthogonal to the first side. The first connecting gear has a first through hole.

The positioning block extends from the first side wall toward the accommodation space and has a sliding groove. The positioning hook post is located in the accommodation space and penetrates the first through hole and the sliding groove. One end of the positioning hook post contacts the first plate, and the other end is limited by the positioning block. A part of the positioning hook post is exposed to the first opening. When the first fine-tuning gear rotates under force, it drives the first worm to rotate, and the first linkage gear moves, changing the position of the positioning hook post in the sliding groove and the inclination angle of the positioning hook post.

In some embodiments, the fastener further includes a first stopper. The first stopper is disposed on the outer surface of the first plate and can selectively contact the first fine-tuning gear. When the first stopper abuts the first fine-tuning gear, the first fine-tuning gear cannot rotate.

In some embodiments, the fastener further includes a first buffer washer. The first buffer washer is disposed in the first through hole of the first linkage gear, and the first buffer washer is in contact with the positioning hook post and the first linkage gear.

In some embodiments, the fastener further includes a buffer material, and the buffer material is configured on the outer surface of the first side wall.

In some embodiments, the positioning hook posts are made of metal. In other embodiments, the positioning hook posts are made of steel cables.

In some embodiments, the second side wall further defines a second slot. The locking member further includes a second worm, a second fine-tuning gear, and a second linking gear.

The second worm is fixedly connected to the first side wall and the second side wall and is adjacent to the second plate. The second fine-tuning gear is installed in the second slot and meshes with the third side of the second worm. The second linkage gear is located in the accommodation space and meshes with a fourth side of the second worm. The fourth side is generally orthogonal to the third side. The second interlocking gear has a second through hole, the positioning hook post is inserted into the first through hole, the second through hole and the sliding groove, and the other end of the positioning hook post is fixed to the second interlocking gear. When the second fine-tuning wheel rotates due to force, it drives the second worm to rotate and links the second linkage gear to move, thereby changing the position and inclination angle of the positioning hook post in the sliding groove.

Furthermore, in some embodiments, the fastener further includes a second stopper. The second stopper is disposed on the outer surface of the second plate and can selectively contact the second fine-tuning gear. When the second stopper is in contact with the second fine-tuning gear, the second fine-tuning gear cannot rotate.

Further, in some embodiments, the fastener further includes a second buffer washer. The second buffer washer is disposed in the second through hole of the second linkage gear, and the second buffer washer is in contact with the positioning hook post and the second linkage gear.

Here, a quick locking assembly is also provided. The quick locking assembly includes the aforementioned locking parts and hook locking parts. The hook and lock piece includes a second housing, a fixed base, a rotating shaft and a rotating piece. The second housing includes a third plate, a fourth plate, a third side wall and a fourth side wall. The third plate and the fourth plate are opposite to each other, and the third side wall and the fourth side wall are opposite to each other and connected on both sides respectively. The third plate member and the fourth plate member have a second opening on the third side wall. The fixed seat is located on the fourth plate. The rotating shaft is installed on the fixed base.

The rotating part is connected to the rotating shaft and is axially fixed on the fixed base. The rotating part includes a hooking part, and the length of the rotating part is greater than the distance between the third side wall and the fourth side wall. The second opening faces the first opening, and the rotating member can selectively rotate so that the hooking portion protrudes from the third side wall through the second opening, and enters the accommodation space through the first opening, so that the hooking portion and the positioning hook post Secure connection.

As described in the previous embodiments, through the first worm, the first fine-tuning gear, the first linkage gear and the mechanism of the positioning hook post of the locking member, the inclination angle of the positioning hook post can be finely adjusted. In this way, the assembly design of curved and spherical panels can be quickly assembled through quick locking assemblies and can be adjusted according to the actual structure, thus achieving the advantages of fast and simple assembly and large design margin.

1:Lock firmware

2:Hook lock piece

10:First shell

11:The first plate

111: First slot

13:Second plate

131: Second slot

15:First side wall

151:First opening

17:Second side wall

21:First worm

21A: First side

21B: Second side

23:Second worm

31: First trim gear

33: Second fine-tuning gear

35: First stop piece

41: First linkage gear

411: First piercing

43: Second linkage gear

431: Second piercing

45:First buffer washer

47:Second buffer washer

50: Positioning block

511:Sliding groove

60: Positioning hook column

65: Cushioning material

70:Second shell

71:Third plate

73:Fourth plate

75:Third side wall

751:Second opening

77:Fourth side wall

81: Fixed seat

83:Rotation axis

90: Rotating parts

91:Hook and lock part

100:Quick locking assembly

R: Accommodation space

Figure 1 is a partial perspective view of the first embodiment of the fastener.

Figure 2 is a partial perspective view of the second embodiment of the fastener.

Figure 3 is a partial perspective view of the quick lock assembly.

In the drawings, the widths of some elements, regions, etc. are exaggerated for clarity. Throughout this specification, the same reference numbers refer to the same elements. It will be understood that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements may also be present. On the contrary, when Yuan When an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present.

It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, components, regions, or sections, these elements, components, regions, and/or sections do not shall be limited by these terms. These terms are only used to distinguish one element, component, region, or section from another element, component, region, layer, or section. Thus, a "first element," "component," "region," or "section" discussed below could be termed a second element, component, region, or section without departing from the teachings herein.

Additionally, relative terms, such as "lower" or "bottom" and "upper" or "top," may be used herein to describe one element's relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation illustrated in the figures. For example, if the device in one of the figures is turned over, elements described as "below" other elements would then be oriented "above" the other elements. Thus, the exemplary term "lower" may include both "lower" and "upper" orientations, depending on the particular orientation of the drawing. Similarly, if the device in one of the figures is turned over, elements described as "below" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "below" or "lower" may include both upper and lower orientations.

Figure 1 is a partial perspective view of the first embodiment of the fastener. As shown in FIG. 1 , the lock 1 includes a first housing 10 , a first worm 21 , a first fine-tuning gear 31 , a first linkage gear 41 , a positioning block 50 and a positioning hook post 60 .

The first housing 10 includes a first plate 11 , a second plate 13 , a first side wall 15 and a second side wall 17 . It can be understood that the first housing 10 is essentially a hexahedral box. In the illustration, part of the wall is omitted only for clarity of presentation. Here, the first plate member 11 and the second plate member 13 are upper and lower wall surfaces in the figure, facing each other. The first side wall 15 and the second side wall 17 are opposite to each other, and are connected to the first plate member 11 and the second plate member 13 on both sides respectively. The first plate 11 is defined with a first slot 111 , and the first side wall 15 is defined with a first opening 151 . An accommodation space R is formed between the first plate 11 , the second plate 13 , the first side wall 15 and the second side wall 17 .

The first worm 21 is fixedly connected to the first side wall 15 and the second side wall 17 and is adjacent to the first plate 11 . In more detail, the first worm 21 is fixed to the inner surfaces of the first side wall 15 and the second side wall 17 . The first fine-tuning gear 31 is installed in the first slot 111 and meshes with the first side 21A of the first worm 21 . The first linkage gear 41 is located in the accommodation space R and meshes with the second side 21B of the first worm 21 . The second side 21B is generally orthogonal to the first side 21A. The first linkage gear 41 has a first through hole 411 . Here, "approximately" refers to what can be seen with the naked eye, and a slight error in angle is actually allowed.

The positioning block 50 extends from the first side wall 15 toward the accommodation space R, and has a sliding groove 511 . The positioning hook post 60 is located in the accommodation space R and penetrates the first through hole 411 and the sliding groove 511 . One end of the positioning hook post 60 contacts the first plate 11 , and the other end is limited by the positioning block 50 . A part of the positioning hook post 60 is exposed to the first opening 151 . When the first fine-tuning gear 31 is rotated under force, for example, by a finger, the first worm 21 is driven to rotate, and the first linking gear 41 is moved in a stepwise manner, changing the position of the positioning hook post 60 in the sliding groove 511 and Position the inclination angle of the hook post 60.

In more detail, the positioning hook post 60 changes its inclination angle through the mechanism of the first fine-tuning gear 31, the rotation of the first worm 21, and the first linkage gear 41, and the sliding groove 511 is used to limit the positioning hook post 60 to avoid excessive tilting. Move. Through the first fine-tuning gear 31 and the first worm 21 The first connecting gear 41 can be rotated and used to fine-tune the actual inclination angle when the hook lock part 2 (see Figure 3 for details) is locked, so that the splicing of the panels can achieve the effect of reducing gaps.

Furthermore, in some embodiments, the positioning hook posts 60 are made of dense metal posts, which can improve the rigidity of the assembly. In other embodiments, the positioning hook post 60 can also be made of a steel cable to provide some elasticity and allow a small amount of local deformation. In this way, it helps to achieve a tighter effect in arc-shaped and circular assembly methods.

Referring to FIG. 1 again, in some embodiments, the fastener 1 further includes a first stopper 35 . The first stopper 35 is disposed on the outer surface of the first plate 11 and can selectively contact the first fine-tuning gear 31. When the first stopper 35 abuts the first fine-tuning gear 31, the first fine-tuning gear 31 cannot be rotated. Thereby, the angle adjusted by the first fine-tuning gear 31 can be locked.

In some embodiments, the fastener 1 further includes a first buffer washer 45 . The first buffer washer 45 is disposed in the first through hole 411 of the first linkage gear 41 . The first buffer washer 45 has a hole coaxial with the first through hole 411 so that the positioning hook post 60 can penetrate. The first buffer washer 45 is in contact with the positioning hook post 60 and the first linkage gear 41 . The first buffer washer 45 can be a washer or other washer to provide buffering and lubrication functions, effectively extending the service life of the positioning hook post 60 and the first linkage gear 41 .

In some embodiments, the fastener 1 further includes a buffer material 65 disposed on the outer surface of the first side wall 15 . In this way, buffering is provided when locking with the hook locking component 2 (see Figure 3 for details).

Figure 2 is a partial perspective view of the second embodiment of the fastener. As shown in FIG. 2 , referring also to FIG. 1 , in addition to the structure of the first embodiment, the fastener 1 of the second embodiment further has a second slot 131 on the second plate 13 . The fastener 1 further includes a second worm 23 (relative to the first worm). At the rod 21 (only the external connection is shown), the second fine-tuning gear 33, and the second linkage gear 43.

The second worm 23 is fixedly connected to the first side wall 15 and the second side wall 17 and is adjacent to the second plate 13 . The second fine-tuning gear 33 is installed in the second slot 131 and meshes with the third side of the second worm 23 . The second linkage gear 43 is located in the accommodation space R and meshes with a fourth side of the second worm 23. The fourth side is generally orthogonal to the third side (the perspective is difficult to draw in this figure, please refer to the first worm to understand). The second linkage gear 43 has a second through hole 431 . The positioning hook post 60 is inserted into the first through hole 411 , the second through hole 431 and the sliding groove 511 . That is, one end of the positioning hook post 60 contacts the first plate 11 and passes through the sliding groove 511 to be limited, while the other end is fixed to the second linkage gear 43 . When the second fine-tuning gear 33 rotates due to force, the second worm 23 is driven to rotate, and the second linking gear 43 is moved, thereby changing the position and inclination angle of the positioning hook post 60 in the sliding groove 511 .

To put it simply, a linkage structure of worms (21, 23), fine-tuning gears (31, 33), and linkage gears (41, 43) are provided on opposite sides of the first housing 10, so that the positioning hook post 60 can Through fine-tuning on both sides, in general assembly, adjustments can be made from the front or rear of the splicing of panels, which is more conducive to the splicing and installation process of panels and can save assembly time.

Referring again to FIG. 2 , although the figure is not drawn due to perspective, it can be understood that corresponding to the position of the first stopper 35 , in some embodiments, the fastener 1 further includes a second stopper. The second stopper is disposed on the outer surface of the second plate 13 and selectively contacts the second fine-tuning gear 33 . When the second stopper contacts the second fine-tuning gear 33, the second fine-tuning gear 33 cannot rotate.

Referring to Figure 2 again, in some embodiments, the fastener 1 further includes. The second slowest The buffer washer 47 is disposed in the second through hole 431 of the second linkage gear 43 , and the second buffer washer 47 is in contact with the positioning hook post 60 and the second linkage gear 43 .

Figure 3 is a partial perspective view of the quick lock assembly. As shown in FIG. 3 , the quick locking assembly 100 includes a locking piece 1 and a hooking piece 2 . In this illustration, the fastener 1 of the first embodiment is used as an example, but this is only used as an example and not for limitation. The detailed structure of the fastener 1 is as described above and will not be described again here.

The hook 2 includes a second housing 70 , a fixed base 81 , a rotating shaft 83 and a rotating member 90 . The second housing 70 includes a third plate 71 , a fourth plate 73 , a third side wall 75 and a fourth side wall 77 . The third plate member 71 and the fourth plate member 73 are opposite to each other, the third side wall 75 and the fourth side wall 77 are opposite to each other, and are connected to the third plate member 71 and the fourth plate member 73 on both sides respectively. It can be understood that the second housing 70 is essentially a hexahedral box, and part of the wall is omitted in this illustration only for clear presentation.

The third side wall 75 defines a second opening 751 . The fixed seat 81 is located on the fourth plate 73 . The rotating shaft 83 is installed on the fixed base 81 . The rotating member 90 is connected to the rotating shaft 83 and is axially fixed on the fixed base 81 . Here, axial fixation only means fixed assembly through the rotating shaft 83, which may actually be coaxial or non-coaxial. In this embodiment, considering the fixation of the rotating member 90, it is fixed in an eccentric and non-coaxial manner. The rotating member 90 includes a hooking portion 91 located at one end of the rotating member 90 . And the length of the rotating member 90 is greater than the distance between the third side wall 75 and the fourth side wall 77 .

When the locking piece 1 and the hooking piece 2 are assembled, the inclination angle of the positioning hook post 60 in the locking piece 1 can be adjusted first, so that the second opening 751 of the hooking piece 2 faces the first opening 151 of the locking piece 1 . After the rotating member 90 is loosened, it is rotated so that the hooking portion 91 passes through the second opening. The opening 751 protrudes from the third side wall 75 and enters the accommodation space R through the first opening 151. The hooking portion 91 and the positioning hook post 60 are locked and connected, and then the rotating member 90 is stabilized and then fixed. On the contrary, the two can be loosened and separated by reverse operation, which can achieve the effect of quick assembly.

Furthermore, the buffering material 65 can be provided on at least one of the outer surfaces of the first side wall 15 and the third side wall 75 . This can avoid causing the first housing 10 or the third housing 10 or the first housing 10 to be damaged due to accidental impact during assembly. The deformation of the second housing 70 affects the overall operation. Furthermore, it can also achieve tightness, making the gaps between installed large panels smaller and the resolution effect higher.

To sum up, through the mechanism of the worm 21/23, the fine adjustment gear 31/33, the linkage gear 41/43 and the positioning hook post 60 of the locking member 1, the inclination angle of the positioning hook post 60 can be finely adjusted. In this way, the curved and spherical plate assembly design can be quickly assembled through the quick locking assembly 100 and can be adjusted according to the actual structure, thereby achieving the advantages of fast and simple assembly and large design margin.

Although the technical content of the present invention has been disclosed above in the form of preferred embodiments, it is not intended to limit the present invention. Any slight changes and modifications made by anyone skilled in the art without departing from the spirit of the present invention should be covered by the present invention. Within the scope of the present invention, the protection scope of the present invention shall be subject to the scope of the appended patent application.

1:Lock firmware

10:First shell

11:The first plate

111: First slot

13:Second plate

15:First side wall

151:First opening

17:Second side wall

21:First worm

21A: First side

21B: Second side

31: First trim gear

35: First stop piece

41: First linkage gear

411: First piercing

45:First buffer washer

50: Positioning block

511:Sliding groove

60: Positioning hook column

65: Cushioning material

R: Accommodation space

Claims (8)

A fastener, including: a first shell, including a first plate, a second plate, a first side wall and a second side wall, the first plate and the second plate facing each other, the The first side wall and the second side wall are opposite to each other and are connected to the first plate and the second plate on both sides respectively. The first plate has a first slot, and the first side wall has a first opening. , an accommodation space is formed between the first plate, the second plate, the first side wall and the second side wall; a first worm is fixedly connected to the first side wall and the second side wall, and is adjacent to The first plate; a first fine-tuning gear installed in the first slot and meshing with a first side of the first worm; a first linking gear located in the accommodation space and engaged with the third A second side of a worm meshes, and the second side is generally orthogonal to the first side. The first linkage gear has a first through hole; a positioning block extends from the first side wall toward the accommodation space. , the positioning block has a sliding groove; a positioning hook post is located in the accommodation space and penetrates the first through hole and the sliding groove. One end of the positioning hook post contacts the first plate member, and the other end Limited by the positioning block, a part of the positioning hook post is exposed in the first opening. When the first fine-tuning gear rotates under force, the first worm is driven to rotate, and the first linkage gear is moved to change the The position of the positioning hook post in the sliding groove and the position and inclination angle of the positioning hook post in the sliding groove; The first stopper is disposed on the outer surface of the first plate and can selectively contact the first fine-tuning gear. When the first stopper abuts the first fine-tuning gear, When the first fine-tuning gear cannot rotate; and a first buffer washer, the first buffer washer is arranged in the first through hole of the first linkage gear, the first buffer washer, the positioning hook post and the first Linkage gear contact. The fastener according to claim 1 further includes a buffer material disposed on the outer surface of the first side wall. The fastener according to claim 1, wherein the positioning hook post is made of metal. The fastener according to claim 1, wherein the positioning hook post is made of a steel cable. The fastener according to claim 1, wherein the second side wall is further provided with a second slot, and the fastener further includes: a second worm fixedly connected to the first side wall and the second side wall and adjacent to the first side wall and the second side wall. a second plate member; a second fine-tuning gear installed in the second slot and meshing with a third side of the second worm; a second linking gear located in the accommodating space and engaged with the second A fourth side of the worm meshes, and the fourth side is substantially orthogonal to the third side. The second linkage gear has a second through hole, in which the positioning hook post passes through the first through hole and the second through hole. Through the holes and the sliding groove, the other end of the positioning hook post is fixed to the second linkage gear, wherein when the second fine-tuning gear rotates under force, it drives the second worm to rotate and links the second linkage gear to move. , and change the position and inclination angle of the positioning hook post in the sliding groove; A second stopper, the second stopper is disposed on the outer surface of the second plate, and can selectively contact the second fine-tuning gear. When the second stopper abuts the second fine-tuning gear, When connected, the second fine-tuning gear cannot rotate; and a second buffer washer is provided in the second through hole of the second linkage gear, and the second buffer washer and the positioning hook post are in contact with the third The two linkage gears are in contact. A quick locking assembly, including: a fastener, including: a first shell, including a first plate, a second plate, a first side wall and a second side wall, the first plate and The second plate members are opposite to each other, the first side wall and the second side wall are opposite to each other, and are respectively connected to the first plate member and the second plate member on both sides, and the first plate member is provided with a first slot, The first side wall has a first opening, and a receiving space is formed between the first plate, the second plate, the first side wall and the second side wall; a first worm is fixedly connected to the first side wall and the second side wall, and adjacent to the first plate; a first fine-tuning gear, installed in the first slot, meshing with a first side of the first worm; a first linkage gear, located In the accommodating space, it meshes with a second side of the first worm, and the second side is generally orthogonal to the first side. The first linking gear has a first through hole; a positioning block is provided by the first One side wall extends toward the accommodation space, and the positioning block has a sliding groove; A positioning hook post is located in the accommodation space and penetrates the first through hole and the sliding groove. One end of the positioning hook post contacts the first plate member, and the other end is limited by the positioning block. The positioning hook post is A part of the column is exposed in the first opening, wherein when the first fine-tuning gear is forced to rotate, it drives the first worm to rotate, and moves the first linkage gear to change the position of the positioning hook column in the sliding groove and the inclination angle of the positioning hook post; a first stopper, which is disposed on the outer surface of the first plate and selectively contacts the first fine-tuning gear. When the first stopper When the component is in contact with the first fine-tuning gear, the first fine-tuning gear cannot rotate; and a first buffer washer is provided in the first through hole of the first connecting gear, the first buffer washer In contact with the positioning hook post and the first linkage gear; and a hook locking component including: a second housing including a third plate, a fourth plate, a third side wall and a fourth side wall, The third plate and the fourth plate are opposite to each other, the third side wall and the fourth side wall are opposite to each other, and are respectively connected to the third plate and the fourth plate on both sides, and the third side wall is provided with a the second opening; a fixed base located on the fourth plate; a rotating shaft installed on the fixed base; and a rotating member connected to the rotating shaft and axially fixed on the fixed base. The component includes a hooking portion, and the length of the rotating component is greater than the distance between the third side wall and the fourth side wall; The second opening faces the first opening, and the rotating member can selectively rotate so that the hooking portion protrudes from the third side wall through the second opening and enters the accommodating space through the first opening. , so that the hooking portion is firmly connected to the positioning hook post. The quick-locking assembly of claim 6 further includes a buffer material disposed on an outer surface of the first side wall or the third side wall. The quick locking assembly of claim 6, wherein the second side wall is further provided with a second slot, and the fastener further includes: a second worm fixedly connecting the first side wall and the second side wall, and adjacent to the second plate; a second fine-tuning gear, installed in the second slot, meshing with a third side of the second worm; a second linkage gear, located in the accommodation space, and A fourth side of the second worm meshes, and the fourth side is generally orthogonal to the third side. The second linkage gear has a second through hole, in which the positioning hook post passes through the first through hole. In the second through hole and the sliding groove, the other end of the positioning hook post is fixed to the second linkage gear. When the second fine-tuning gear rotates under force, it drives the second worm to rotate and links the second linkage gear. The two linkage gears move to change the inclination angle of the positioning hook column; a second stopper is provided on the outer surface of the second plate member and can selectively contact the second fine-tuning gear. , when the second stopper is in contact with the second fine-tuning gear, the second fine-tuning gear cannot rotate; and The fastener further includes a second buffer washer, which is disposed in the second through hole of the second linkage gear. The second buffer washer is in contact with the positioning hook post and the second linkage gear.

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