Metal and plastic combined male buckle and combined inserting buckle thereof

Abstract

The utility model relates to a metal and plastic combined male buckle and a combined plug buckle thereof, and belongs to the technical field of design of plug buckles, the combined male buckle comprises a male buckle base and two plug pins which are rotatably connected to the male buckle base within a certain angle, the male buckle base is provided with a mounting part which extends and protrudes towards the position between the plug pins on the two sides, and the plug pins are arranged on the two sides of the male buckle base. The front end of the mounting part is connected with a plastic elastic piece, and the plastic elastic piece is provided with an elastic arm continuously extending towards the pins on the two sides; in a static state, the elastic arms partially abut against the two sides of the mounting part, and one ends of the two elastic arms respectively abut against the pins on the two sides, so that the pins on the two sides always have a trend of being relatively far away from each other. The combined inserting buckle comprises the male buckle and the corresponding female buckle which are connected in an inserted mode. The design requirement of the light-weight combined type inserting buckle is met, and meanwhile it can be guaranteed that the male buckle has the good service life and structural strength on the basis of the light structural design.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of inserts, in particular to a metal and plastic combined male buckle and a combined insert thereof. BACKGROUND

[0002] The insert is a kind of connecting component widely used in the belt, which realizes the detachable connection between the belt and the belt through the mutual buckling of the male buckle and the female buckle. Generally speaking, the insert can be divided into metal insert and plastic insert according to the material of the insert, and each has different advantages. The metal insert has strong connection strength, and the plastic insert has lighter weight. However, the disadvantages of the metal insert and the plastic insert are also obvious. The installation of the spring sheet of the metal insert is not easy; although the plastic insert has lighter weight, the connection strength of the male buckle and the female buckle is far less than that of the metal insert, and there is a great risk of fracture in the case of high strength use.

[0003] Therefore, the market gradually shows the metal and plastic combined insert. The parts such as the male buckle base and the insertion foot which need to ensure the structural strength are made of metal, and the part providing elastic force to the insertion foot begins to be made of plastic. For example, the applicant discloses CN109222342A metal and plastic combined insert, which provides elastic force to the insertion foot through the elastic arms of the plastic elastic piece extending on both sides of the intermediate convenient installation. Compared with the metal insert, the overall weight can be reduced, and the assembly steps of the insert can be greatly simplified.

[0004] However, in the process of further lightweight design of the insert, the applicant finds that the structure of the plastic elastic piece in the original design limits the structure of the male buckle, so that it is difficult to provide a more lightweight insert structure on the basis of this structure. CONTENT OF THE UTILITY MODEL

[0005] In order to meet the design requirements of the lightweight combined insert, ensure the service life of the male buckle on the basis of the relatively lightweight structure design, the present application provides a metal and plastic combined male buckle and a combined insert thereof.

[0006] In the first aspect, the metal and plastic combined male buckle provided by the present application adopts the following technical scheme:

[0007] A metal and plastic combined male buckle, comprising a male buckle base and two insertion feet rotatably connected in a certain angle on the male buckle base, the male buckle base has an installation part extending and protruding between the two insertion feet, the front end of the installation part is connected with a plastic elastic piece, the plastic elastic piece has elastic arms continuously extending to the two insertion feet; in the static state, the elastic arms partially abut on both sides of the installation part, and one end of each of the two elastic arms abuts on the two insertion feet so that the two insertion feet always have a tendency to move away from each other.

[0008] In this scheme, the protrusion of the mounting portion occupies most of the original middle part of the male buckle, which can be hollowed out for lightweight design. The corresponding plastic elastic piece is designed as an arch structure similar to W type, which can meet the demand of providing elasticity to the prongs in a small space. At the same time, the structure will deform the part of the elastic arm against the mounting portion during use, effectively dispersing stress concentration, and enabling the light structure of the male buckle to have a good service life.

[0009] Preferably, the elastic arm comprises an integral deformation arm and an abutting arm, the deformation arm extends from the middle of the plastic elastic piece to both sides and abuts the two sides of the mounting portion, and the abutting arm extends in the opposite direction at one end of the deformation arm and abuts the prong.

[0010] Preferably, the width of the deformation arm is smaller than the width of the abutting arm, and the thickness of the deformation arm is greater than the thickness of the abutting arm.

[0011] Preferably, the two sides of the mounting portion are provided with limiting grooves for the deformation arm to partially pass through.

[0012] Preferably, the length of the abutting arm is greater than the length of the deformation arm, and the abutting arm extends out of the side of the deformation arm away from the mounting portion.

[0013] Preferably, the inside of the prong has a cavity for the elastic arm to pass through, and the abutting arm is contained in the cavity.

[0014] Preferably, the distance between the inner walls of the two prongs abutting the elastic arm gradually decreases in the direction away from the male buckle base.

[0015] Preferably, the plastic elastic piece further comprises a fixed block, and the two elastic arms are connected to the two sides of the fixed block, the front end of the mounting portion extends out of two clamping pieces, and the fixed block is clamped between the two clamping pieces.

[0016] Preferably, the side of the clamping piece towards the fixed block is provided with a plurality of convex strips abutting the fixed block.

[0017] Preferably, the mounting portion is provided with a positioning column passing into the fixed block.

[0018] Preferably, the distance between the two sides of the mounting portion gradually decreases in the direction away from the male buckle base.

[0019] Preferably, the distance between the openings of the two prongs allows the plastic elastic piece in the compressed state to pass through.

[0020] Preferably, the mounting portion and the male buckle base have a trapezoidal space.

[0021] Preferably, the plastic elastic member is made of nylon or POM plastic material.

[0022] Preferably, the pin and the male buckle base are made of zinc alloy or aluminum alloy metal material.

[0023] In a second aspect, the application provides a metal and plastic combined plug-in buckle using the following technical solutions:

[0024] A metal and plastic combined plug-in buckle, comprising a male buckle and a female buckle which are inserted and matched with each other, wherein the male buckle is the combined male buckle described above.

[0025] Preferably, the female buckle has an insertion space for the insertion of the male buckle, the end of the pin is provided with a guide block, and the inner wall of the insertion space of the female buckle is provided with a guide groove which penetrates in the insertion direction, so that the guide block is guided by the groove walls on both sides of the guide groove to approach each other.

[0026] In summary, the application has at least one of the following beneficial technical effects:

[0027] 1. The corresponding structure can better meet the needs of lightweight design, so that the male buckle as a whole is more portable, while the service life of the male buckle is not affected, and the service life of the designed plastic elastic member is better, the structural strength is higher, and the pin also has a larger holding force;

[0028] 2. The installation between the components is relatively convenient, the plastic elastic member can be assembled after the assembly of the metal components is completed, and the production process flow of the plug-in buckle as a whole is better optimized, and the installation operation is more convenient than the traditional metal plug-in buckle.

[0029] 3. The appearance is good, and the outer side of the pin is not easy to be worn after multiple uses, thereby improving the service life. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is an exploded schematic view of the male buckle in the embodiment of the application.

[0031] Figure 2 is a sectional view of the male buckle in the embodiment of the application.

[0032] Figure 3 is a sectional view of the connection between the plastic elastic member and the male buckle base in the embodiment of the application.

[0033] Figure 4 is a front view of the plastic elastic member in the embodiment of the application.

[0034] Figure 5 is a top view of the plastic elastic member in the embodiment of the application.

[0035] Figure 6 Fig. 1 is a structural schematic diagram of a male buckle base in an embodiment of the present application.

[0036] Figure 7 Fig. 2 is a front view of an insert buckle when the male buckle and the female buckle are connected in an embodiment of the present application.

[0037] Figure 8 Fig. 3 is a structural schematic diagram of a female buckle in an embodiment of the present application, which focuses on a guide groove.

[0038] Figure 9 Fig. 4 is a structural schematic diagram of an insert pin in an embodiment of the present application.

[0039] Figure 10 Fig. 5 is a structural schematic diagram of a female buckle in an embodiment of the present application, which focuses on a clamping space.

[0040] Figure 11 Fig. 6 is a structural schematic diagram of an insert buckle when the male buckle and the female buckle are connected in an embodiment of the present application.

[0041] Legend: 1, male buckle base; 2, insert pin; 3, plastic elastic piece; 11, mounting portion; 31, fixed block; 32, elastic arm; 321, deformation arm; 322, abutting arm; 12, positioning column; 311, positioning hole; 13, clamping sheet; 14, convex strip; 15, limiting groove; 21, cavity; 4, guide groove; 22, guide block; 5, clamping space; 6, shielding surface; 221, guide inclined surface; 222, clamping surface; 223, arc angle; 7, thickening block; 71, guide inclined surface. DETAILED DESCRIPTION

[0042] The following will be described in detail with reference to the accompanying drawings. Figures 1-11 The present application will be further described in detail.

[0043] An embodiment of the present application discloses a metal and plastic combined male buckle, which is used for connection with an adapted female buckle. Referring to Figure 1 and Figure 2 An embodiment of the present application discloses a metal and plastic combined male buckle, which is used for connection with an adapted female buckle. Referring to Figure 1The combined male buckle comprises a male buckle base 1, two prongs 2 and a plastic elastic piece 3. The male buckle base 1 and the prongs 2 are made of metal material. The male buckle base 1 has a mounting portion 11 protruding outwardly in the middle of one side. The two prongs 2 are rotatably connected to the male buckle base 1 at one end and are located on both sides of the mounting portion 11. The prongs 2 and the male buckle base 1 have a limited structure to limit the rotation of the two prongs 2 within a certain angle. The two sides of the mounting portion 11 are inclined from the front end of the protruding male buckle base 1 to both sides, so that the mounting portion 11 is approximately triangular in shape. The plastic elastic piece 3 is partially fixed to the front end of the mounting portion 11, and the two sides of the plastic elastic piece 3 abut against the two prongs 2 respectively, so that the two prongs 2 always have a tendency to move away from each other. In the static state, the plastic elastic piece 3 forces the two prongs 2 to remain relatively static due to the limited opening and closing angle of the limited structure. During use, the user pinches the two prongs 2 to make the prongs 2 overcome the elastic force of the plastic elastic piece 3 and move closer to each other.

[0044] Referring to Figure 2 and Figure 3 The plastic elastic piece 3 comprises a fixed block 31 for connecting with the mounting portion 11 and elastic arms 32 located on both sides of the fixed block 31. The elastic arms 32 are used to abut against the two prongs 2 and provide elastic force for resetting the prongs 2. In an implementable manner, the elastic arms 32 comprise integral deformation arms 321 and abutting arms 322. One end of the deformation arm 321 is connected to the fixed block 31, and the other end of the deformation arm 321 is integrally connected with the abutting arm 322. The deformation arm 321 extends outwardly from both sides of the fixed block 31 and along the outer side walls of both sides of the mounting portion 11. The abutting arm 322 extends from the other end of the deformation arm 321 and is opposite to the extension direction of the deformation arm 321. Overall, the two deformation arms 321 and the abutting arms 322 are continuously connected to form an arc structure similar to a "W" type, and are installed and abut against the front end of the mounting portion 11 and both sides of the mounting portion 11. The two outer ends of the abutting arms 322 are used to abut against the two prongs 2 and always provide a certain pressure to the prongs 2.

[0045] In the process of exerting force on the two side prongs 2, the two side prongs 2 will be inwardly retracted to cause certain deformation of the plastic elastic member 3. Specifically, the portion of the abutting arm 322 abutting against the prong 2 will move along the surface of the prong 2 in a direction away from the male coupling base 1, while the deformed arm 321 as a whole will be bent to provide the required restoring elastic force, at this time, the deformed arm 321 will be slightly separated from the mounting portion 11 to meet the deformation needs of the deformed arm 321. When the external force is removed, the restoring force generated by the deformed arm 321 will force the two side prongs 2 to expand outwardly to restore the original state. It can be seen that in the original state, through the abutment of the deformed arm 321 on both sides of the mounting portion 11, the effect of the abutting arm 322 abutting against the prong 2 can be better supported, so that the strength of the prong 2 in the original state can be better guaranteed. In a preferred embodiment, the deformed arm 321 also has a certain deformation in the original state, so that the abutting arm 322 can always exert an elastic force on the prong 2, so that the prong 2 can always be kept in the original state through the cooperation of the limiting structure.

[0046] The structure of the plastic elastic member 3 in this W type can have a longer service life and meet the required elastic force needs for a longer period of time. Compared with the traditional V type structure, the stress is usually concentrated at the connection during continuous twisting, which can make the V type structure be affected by material fatigue and have a risk of breaking earlier, while the W type structure can disperse the stress generated during the twisting process on the deformed arm 321, so that the W type structure can have a longer service life under the same material.

[0047] Further, as shown in Figure 4 and Figure 5 , the width A1 of the deformed arm 321 is smaller than the width A2 of the abutting arm 322, and the thickness B1 of the deformed arm 321 is greater than the thickness B2 of the abutting arm 322. The smaller width of the deformed arm 321 can make the deformed arm 321 more easily deformed as a whole, while the greater thickness can improve the structural strength of the deformed arm 321 to some extent, thereby increasing the number of bending of the deformed arm 321 to improve the service life. The abutting arm 322 with a larger width can make the abutting arm 322 itself not easily deformed, so that the deformation is concentrated on the deformed arm 321.

[0048] Referring to the drawings Figure 5 and Figure 6, the front end of the mounting portion 11 is integrally provided with a positioning column 12, the fixing block 31 is provided with a positioning hole 311 for the positioning column 12 to pass through, the front end of the mounting portion 11 is provided with a clamping piece 13 extending along both sides of the fixing block 31, both clamping pieces 13 clamp the fixing block 31 therebetween, on this basis, the clamping piece 13 is integrally provided with at least one convex strip 14 abutting against the fixing block 31 on the side facing the fixing block 31, and both sides of the mounting portion 11 are provided with a limiting groove 15 for the deformed arm 321 to pass through for limiting. During installation, the positioning hole 311 in the center of the fixing block 31 is aligned with the positioning column 12, and both sides of the elastic arm 32 are aligned with both sides of the mounting portion 11, the fixing block 31 is pressed into both clamping pieces 13 by extruding the mounting portion 11, and the relative fixation between the fixing block 31 and the mounting portion 11 is completed by the further fastening action of the convex strip 14. This way can better achieve the quick installation of the fixing block 31, and can also quickly replace the plastic elastic piece 3 as a whole when the plastic elastic piece 3 is fatigued and broken.

[0049] It is also because of this quick and fastening way, in a preferred embodiment, as shown in Figure 2 , the length of the abutting arm 322 is greater than the length of the deformed arm 321, and the abutting arm 322 extends away from the side of the deformed arm 321 away from the mounting portion 11. Whether in the original state or in the extruded state, the abutting arm 322 always has a tendency to fold inward due to the extrusion of the pin 2, so that the plastic elastic piece 3 as a whole has a tendency to approach the mounting portion 11, so that the fixing block 31 is difficult to be separated from the male buckle base 1. Further, this arrangement can also improve the effect of the abutting arm 322 abutting against the pin 2 to some extent.

[0050] At the same time, an opening is formed between the two pins 2 away from the male buckle base 1, which can allow the plastic elastic piece 3 in the compressed state to pass through, and cooperate with the quick installation structure of the plastic elastic piece 3 and the male buckle base 1, so that the plastic elastic piece 3 can be installed under the condition that the pin 2 is connected with the male buckle base 1. Specifically, the bending portions of the abutting arm 322 and the deformed arm 321 are located within the projection range of the opening formed between the two pins 2 (for example Figure 2The dotted line indicates the range of the plug 2. Generally, since the plug 2 and the male buckle base 1 are made of metal material by die casting, after the preliminary polishing and processing of the parts are completed, the plug 2 and the male buckle need to be electroplated. This design can uniformly perform single electroplating process after the plug 2 and the male buckle base 1 are assembled, and then assemble with the plastic elastic piece 3, without electroplating the plug 2 and the male buckle base 1 respectively and then assembling, which can save the repeated electroplating operation of multiple parts from the electroplating process and better save the cost. From the general structure, the plug 2 and the male buckle base 1 are usually connected by metal rivets to realize the rotary connection of the two, and this way of assembling first and then electroplating can also prevent scratching the product during assembly and improve the qualification rate of the product.

[0051] The plug 2 has a cavity 21 for the elastic arm 32 to pass through, and the cavity 21 makes the side of the plug 2 form a thinner wall. The distance between the inner walls of the two plugs 2 abutting against the elastic arm 32 gradually decreases in the direction away from the male buckle base 1, which also makes the end of the plug 2 away from the male buckle base 1 form an inclined guide surface. The abutting arm 322 of the plastic elastic piece 3 is accommodated in the cavity 21, and the clamping piece 13 on the mounting portion 11 also extends in the circumferential direction to cover the area where the deformation arm 321 is located, so that when the male buckle is viewed from the front surface of the male buckle, the plastic elastic piece 3 cannot be directly seen, and only the electroplated metal part can be seen from the appearance, thereby improving the quality of the appearance and also meeting the lightweight demand of the plug 2. Further, as can be seen from the figure, the positions of the male buckle base 1 and the mounting portion 11 occupy most of the volume of the male buckle, and by cooperating with the aforementioned plastic elastic piece 3, a larger trapezoidal space can be dug out between the mounting portion 11 and the male buckle base 1, which does not affect the structural strength of the male buckle base 1, and makes the male buckle base 1 cooperate with the thin-walled structure of the plug 2 to better meet the lightweight demand.

[0052] In the embodiment of the present application, the plastic elastic piece 3 can be made of nylon or POM plastic material, and the plug 2 and the male buckle base 1 can be made of zinc alloy or aluminum alloy metal material.

[0053] The embodiment of the present application also discloses a metal and plastic combined plug buckle, referring to Figure 7 which is composed of a male buckle and a female buckle that are inserted and cooperated with each other, and the male buckle adopts the aforementioned combined male buckle. As can be seen from the figure, the volume occupied by the male buckle and the female buckle with this structure is smaller, and the hollow area is larger. The main parts (such as the plastic elastic piece 3 and the plug 2) are concentrated at X in the middle of the plug buckle, and there is no need for an additional guide tongue structure, which results in that the overall weight of the plug buckle is lighter than that of the usual combined plug buckle, and the plastic elastic piece 3 hidden inside will not be exposed when the female buckle and the male buckle are cooperated.

[0054] wherein, referring to Figure 8 andFigure 9 The female buckle has an insertion space for the male buckle to be inserted into, and a guide groove 4 is arranged on the inner wall of the insertion space in the insertion direction, and the guide groove 4 is arranged on the two end faces of the inner wall of the female buckle. The side of the guide groove 4 facing the insertion direction of the male buckle is a trumpet-shaped opening, and the two side walls of the guide groove 4 gradually shrink towards the insertion direction of the male buckle. The end of the pin 2 of the male buckle is integrally provided with a guide block 22, and during the connection of the male buckle and the female buckle, the guide block 22 on the pin 2 will abut against the groove wall of the trumpet-shaped opening of the guide groove 4, and with the insertion of the male buckle, the guide blocks 22 on the two pins 2 will gradually approach through the guidance of the guide groove 4.

[0055] Referring to Figure 10 and Figure 11 and combining Figure 7 , the side of the female buckle facing away from the insertion direction of the male buckle is provided with a clamping space 5 for the guide block 22, the guide groove 4 communicates with the clamping space 5, and the width of the clamping space 5 is greater than the width of the end of the guide groove 4, so that after passing through the guide groove, the guide block 22 is moved outward by the elastic opening of the plastic elastic piece 3 to be clamped into the clamping space 5. At this time, the guide block 22 cannot be retracted into the guide groove 4 without external force. In order to improve the quality of the appearance, a shielding surface 6 can be arranged on the front surface of the female buckle to shield the clamping space 5, so that the guide block 22 can be shielded by the shielding surface 6, so that the guide block 22 cannot be seen on the front surface of the female buckle.

[0056] Referring to Figure 9 , further, the guide block 22 has a guide inclined surface 221 and a clamping surface 222, the guide inclined surface 221 is located on the side of the guide block 22 away from the base 1 of the male buckle, and the clamping surface 222 is located on the side of the guide block 22 close to the base 1 of the male buckle, the guide inclined surface 221 and the clamping surface 222 of the guide block 22 are configured in a substantially triangular shape, wherein the transition between the guide inclined surface 221 and the clamping surface 222 has an arc corner 223. Wherein, when the guide inclined surface 221 just contacts the inclined surface of the trumpet-shaped opening of the guide groove, the guide inclined surface 221 is substantially in contact with the groove wall of the guide groove, and when the guide block 22 is clamped into the clamping space 5, the clamping surface 222 is opposite to the wall of the clamping space 5. Therefore, this design not only makes the male buckle and the female buckle more stable after insertion and connection, but also reduces the contact area during sliding by the abutment of the arc corner 223 of the guide block 22 and the groove wall of the guide groove 4 during the process of the guide block 22 passing through the guide groove 4, thereby reducing the resistance during the assembly of the male buckle and the female buckle. This way can avoid scratches on the side of the pin 2 caused by repeated insertion and removal, and improve the appearance quality of the product

[0057] In a preferred embodiment, referring to Figure 8 and Figure 9The two sides of the same pin 2 are provided with guide blocks 22, so the guide groove 4 is also provided on the inner side of the insertion space of the female buckle. On this basis, the female buckle is provided with thickening blocks 7 on the inner wall of the insertion space, the thickening blocks 7 are provided with guide inclined surfaces 71 on the side facing the insertion direction of the male buckle, the thickening blocks 7 are located on both sides of the guide groove and close to the clamping space 5, so the female buckle is provided with four thickening blocks 7 in total, when the male buckle is connected with the female buckle, each pin 2 is limited between two corresponding thickening blocks 7, so as to improve the stability of the male buckle and the female buckle after connection.

[0058] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A metal and plastic composite male buckle, comprising a male buckle base (1) and two pins (2) rotatably connected to the male buckle base (1) within a certain angle, characterized in that: The male buckle base (1) has a mounting portion (11) extending and protruding between the two side pins (2). The front end of the mounting portion (11) is connected to a plastic elastic element (3). The plastic elastic element (3) has elastic arms (32) extending continuously to the two side pins (2). In a static state, the elastic arms (32) partially abut against the two sides of the mounting portion (11), and one end of each elastic arm (32) abuts against the two side pins (2) so that the two side pins (2) always tend to move away from each other.

2. The combined male buckle according to claim 1, characterized in that: The elastic arm (32) includes an integrally formed deformable arm (321) and an abutment arm (322). The deformable arm (321) extends from the middle of the plastic elastic member (3) to both sides and abuts against both sides of the mounting part (11). The abutment arm (322) extends in the opposite direction at one end of the deformable arm (321) and abuts against the pin (2).

3. The combined male buckle according to claim 2, characterized in that: The width of the deformable arm (321) is smaller than the width of the abutting arm (322), and the thickness of the deformable arm (321) is greater than the thickness of the abutting arm (322).

4. The combined male buckle according to claim 2, characterized in that: The mounting part (11) has limiting grooves (15) on both sides for the deformation arm (321) to pass through.

5. The combined male buckle according to claim 2, characterized in that: The length of the abutment arm (322) is greater than the length of the deformation arm (321), and the abutment arm (322) extends from the side of the deformation arm (321) away from the mounting part (11).

6. The combined male buckle according to claim 1, characterized in that: The plastic elastic element (3) also includes a fixing block (31), and the elastic arms (32) on both sides are connected to the two sides of the fixing block (31). Two clips (13) extend from the front end of the mounting part (11), and the fixing block (31) is clamped between the two clips (13). Several protrusions (14) that abut against the fixing block (31) are provided on the side of the clips (13) facing the fixing block (31). A positioning post (12) that passes through the fixing block (31) is provided on the mounting part (11).

7. The combined male buckle according to claim 1, characterized in that: The distance between the two sides of the mounting part (11) gradually decreases in the direction away from the male fastener base (1).

8. The combined male buckle according to claim 1, characterized in that: The spacing of the opening between the two pins (2) allows the plastic elastic element (3) in a compressed state to pass through.

9. The combined male buckle according to claim 1, characterized in that: There is a trapezoidal space between the mounting part (11) and the male buckle base (1).

10. A metal and plastic composite snap fastener, comprising a male and female snap fastener that interlock, characterized in that: The male buckle is a combined male buckle as described in any one of claims 1-9.

11. The metal and plastic combined snap fastener according to claim 10, characterized in that: The female buckle has an insertion space for the male buckle to be inserted. The end of the pin (2) is provided with a guide block (22). The female buckle is provided with a guide groove (4) that runs through the insertion direction on the inner wall of the insertion space. The male buckle is inserted into the female buckle so that the guide block (22) is guided by the groove walls on both sides of the guide groove (4) to move closer to each other.

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