A butterfly clasp

Abstract

The application discloses a butterfly buckle, and relates to the technical field of building reinforcing parts, which comprises a buckle body, a sleeve, a plurality of friction blocks and an adjusting assembly, the buckle body is provided with a first end and a second end which are oppositely distributed, and the first end is provided with a fixing part; the sleeve penetrates through the buckle body, and the sleeve is arranged along the first end towards the second end; the plurality of friction blocks are uniformly distributed around the circumference of the sleeve, and one end of the friction blocks towards the center of the sleeve can penetrate into the inner side of the sleeve; the adjusting assembly is connected with the plurality of friction blocks, and the adjusting assembly can drive the friction blocks to move along the radial direction of the sleeve to a first position or a second position, and in the first position, the plurality of friction blocks all penetrate into the inner side of the sleeve. The butterfly buckle is more convenient to disassemble and assemble, and is more fixed when connecting a support formwork.

Description

Technical Field

[0001] This invention relates to the field of building reinforcement technology, and in particular to a butterfly buckle. Background Technology

[0002] In construction engineering, formwork is needed for concrete pouring and other construction operations. The formwork is secured using butterfly clips and steel pipes. Specifically, the steel pipes are positioned horizontally and vertically against the formwork, and a fixing rod is installed perpendicular to the formwork surface. The fixing rod passes through the butterfly clip, which abuts against the steel pipe and uses the steel pipe to support the formwork. Some existing butterfly clips use threaded connections between the fixing rod and the butterfly clip, making installation and removal cumbersome. Other butterfly clips, such as those described in document CN215107368U, use rotatable pins to abut against the surface of the fixing rod for installation. However, the force between the pin and the fixing rod is limited, and a spring is needed to maintain contact, making the butterfly clip prone to loosening under heavy loads. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a butterfly buckle, which is easier to assemble and disassemble, and provides a more secure fixation when connecting support templates.

[0004] According to an embodiment of the present invention, a butterfly buckle includes a buckle body having a first end and a second end that are distributed opposite to each other, and the first end is provided with a fixing part; A sleeve that penetrates the buckle body and is disposed along the first end toward the second end; Multiple friction blocks are evenly distributed around the circumference of the sleeve, and one end of each friction block facing the center of the sleeve can penetrate into the inside of the sleeve. An adjustment assembly is connected to a plurality of friction blocks. The adjustment assembly is capable of driving the friction blocks to move radially along the sleeve to a first position or a second position. In the first position, the plurality of friction blocks are inserted into the inner side of the sleeve.

[0005] The butterfly buckle according to embodiments of the present invention has at least the following beneficial effects: the butterfly buckle mainly includes a buckle body, a fixing part is provided at the first end of the buckle body for contacting and fixing a steel pipe, and the buckle body is provided with a sleeve for the fixing pull rod to pass through; the fixing pull rod passes through the sleeve, and multiple friction blocks are moved to a first position using an adjusting component, the friction blocks penetrate into the inner side of the sleeve and make frictional contact with the surface of the fixing pull rod, thereby achieving the fixation between the buckle body and the fixing pull rod, making it more convenient to install or remove the buckle body; at the same time, the frictional contact between the multiple friction blocks and the fixing pull rod can generate greater frictional force, and the buckle body is not easy to loosen even under greater load.

[0006] According to some embodiments of the present invention, the sidewall of the sleeve is provided with a plurality of guide grooves, the plurality of guide grooves are distributed around the circumference of the sleeve, the guide grooves penetrate the sidewall of the sleeve, and each friction block is disposed in one of the guide grooves, the friction block sliding in the guide groove.

[0007] According to some embodiments of the present invention, the side of the friction block facing the center of the sleeve is a friction surface, and the side of the friction block away from the center of the sleeve is a guide slope. Along the direction from the first end to the second end, the guide slope gradually moves away from the center of the sleeve. The adjusting assembly includes a limiting member and a control member. The limiting member is fitted onto the friction block and contacts the guide slope. The control member is connected to the limiting member to drive the limiting member to move axially along the sleeve.

[0008] According to some embodiments of the present invention, the control member includes a first rod portion and a second rod portion, the first rod portion and the second rod portion intersecting to form an angle, the intersection point of the first rod portion and the second rod portion being hinged to the buckle body, the first rod portion extending to the outside of the buckle body, the second rod portion being movably connected to the limiting member, when the first rod portion rotates around the hinge point to approach the buckle body, the second rod portion drives the limiting member to move towards the first end, when the first rod portion rotates around the hinge point to move away from the buckle body, the second rod portion drives the limiting member to move towards the second end, the first rod portion is provided with a slot, when the first rod portion moves away from the buckle body, the slot is located on the outside of the buckle body, the slot is fitted with a locking block, and the locking block is located between the first rod portion and the buckle body.

[0009] According to some embodiments of the present invention, the guide groove is provided with a margin along the axial direction of the sleeve, and the friction block is movable in the guide groove along the axial direction of the sleeve.

[0010] According to some embodiments of the present invention, a spring is provided between the second rod and the buckle body, the spring being configured to drive the second rod to rotate in order to maintain the limiting member having a tendency to move toward the second end.

[0011] According to some embodiments of the present invention, the guide slope of the friction block is provided with flanges on both sides, and the flanges are able to abut against the outer surface of the sleeve to prevent the guide slope from extending into the inner side of the sleeve.

[0012] According to some embodiments of the present invention, the roughness of the friction surface is greater than the roughness of the guide ramp.

[0013] According to some embodiments of the present invention, the friction block has a chamfer on the side facing the first end, and the chamfer is located on one side of the friction surface.

[0014] According to some embodiments of the present invention, the fixing part includes two arc-shaped slots, which are symmetrically arranged on the buckle body with the central axis of the sleeve as the axis of symmetry.

[0015] 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

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 A schematic diagram illustrating the structure for securing the template by connecting the butterfly buckle to the fixing rod; Figure 2 This is a schematic diagram of the butterfly buckle structure according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the butterfly buckle according to an embodiment of the present invention; Figure 4 This is a partially enlarged schematic diagram of the butterfly buckle according to an embodiment of the present invention.

[0017] Icon labels: Fixed tie rod 001, steel pipe 002, formwork 003; Buckle body 100, fixing part 110, arc-shaped groove 111, sleeve 200, guide groove 210, friction block 300, friction surface 301, guide slope 302, flange part 310, adjusting component 400, limiting part 410, control part 420, first rod part 421, second rod part 422, groove 423, locking block 430, spring 440. Detailed Implementation

[0018] 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.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0020] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] As described in the background section... Figure 1 This diagram illustrates the connection between the butterfly buckle and the fixing rod 001. The butterfly buckle abuts against the steel pipe 002, and the template 003 is reinforced through the contact between the steel pipe 002 and the template 003. It should be understood that the structure and installation structure of the template, fixing rod, and steel pipe are existing technologies and will not be described in further detail here. The main improvement of this invention lies in the butterfly buckle used in conjunction with the template, fixing rod, and steel pipe; therefore, the structure of the butterfly buckle will be further explained.

[0023] Reference Figure 2 As shown, a butterfly buckle according to an embodiment of the present invention includes a buckle body 100, a sleeve 200, a plurality of friction blocks 300 and an adjustment component 400.

[0024] The buckle body 100 has a first end and a second end that are relatively distributed. The first end is provided with a fixing part 110. The sleeve 200 passes through the buckle body 100 and is arranged from the first end toward the second end. The sleeve 200 is for the fixing rod to pass through. When using the butterfly buckle to fix the template, the first end of the buckle body 100 is oriented toward the template position, that is, the fixing part 110 is oriented toward the steel pipe on the template surface. At the same time, the fixing rod is inserted into the sleeve 200 and passes through the sleeve 200.

[0025] Multiple friction blocks 300 are evenly distributed around the circumference of the sleeve 200, and one end of the friction block 300 facing the center of the sleeve 200 can penetrate into the inner side of the sleeve 200; the adjusting component 400 is connected to the multiple friction blocks 300, and the adjusting component 400 can drive the friction blocks 300 to move radially along the sleeve 200 to a first position or a second position. In the first position, the multiple friction blocks 300 are all inserted into the inner side of the sleeve 200.

[0026] After the fixed tie rod extends out of the sleeve 200, the friction block 300 moves towards the center of the sleeve 200 to contact the surface of the fixed tie rod. Therefore, by using the adjusting assembly 400 to drive the friction block 300 to move radially towards the inside of the sleeve 200, i.e., to the first position where the friction block 300 makes frictional contact with the surface of the fixed tie rod, the buckle body 100 is thus fixed to the fixed tie rod via the friction block 300.

[0027] It is important to understand that the friction block 300, driven by the adjusting assembly 400, can move to either a first position or a second position. The first position is defined as the friction block 300 penetrating the inner side of the sleeve 200. Since the friction block 300 can only exist in either the first or second position, when the friction block 300 is not in the first position, it is defined as being in the second position. In other words, when the friction block 300 is not penetrating the inner side of the sleeve 200, it is in the second position.

[0028] When the butterfly buckle needs to be removed, use the adjusting component 400 to move the friction block 300 to the second position, that is, the friction block 300 is away from the inside of the sleeve 200, the friction block 300 no longer rubs against the surface of the fixed pull rod, and the buckle body 100 can be pulled out from the fixed pull rod.

[0029] It is understood that a specific embodiment is provided to realize the installation connection between the friction block 300 and the sleeve 200. Specifically, the side wall of the sleeve 200 is provided with a plurality of guide grooves 210, which are distributed around the circumference of the sleeve 200 and penetrate through the side wall of the sleeve 200. Each friction block 300 is disposed in one guide groove 210 and slides in the guide groove 210.

[0030] The guide groove 210 guides and restricts the movement path of the friction block 300, that is, the guide groove 210 restricts the movement path of the friction block 300 to radial movement along the sleeve 200. This allows the friction block 300 to move and penetrate into the center of the sleeve 200, making contact with the surface of the fixed tie rod inside the sleeve 200.

[0031] It is understood that an adjustment component 400 is provided to adjust the position of the friction block 300. Specifically, the side of the friction block 300 facing the center of the sleeve 200 is a friction surface 301, and the side of the friction block 300 away from the center of the sleeve 200 is a guide slope 302. Along the direction from the first end to the second end, the guide slope 302 gradually moves away from the center of the sleeve 200. The adjustment component 400 includes a limiting member 410 and a control member 420. The limiting member 410 is fitted onto the friction block 300 and contacts the guide slope 302. The control member 420 is connected to the limiting member 410 to drive the limiting member 410 to move axially along the sleeve 200.

[0032] When the control component 420 drives the limiting component 410 to move from the first end to the second end, as the guide slope 302 gradually moves away from the center of the sleeve 200, the limiting component 410 is fitted onto the friction block 300. Since the size of the limiting component 410 remains constant, it contacts the guide slope 302, pressing the friction block 300 into the inner side of the sleeve 200. It should be understood that the greater the distance the limiting component 410 moves from the first end to the second end, the greater the distance the friction block 300 penetrates into the inner side of the sleeve 200. This means the contact force between the friction block 300 and the surface of the fixed tie rod is greater, resulting in greater friction between the friction block 300 and the fixed tie rod, and a more secure fixation.

[0033] When the control element 420 drives the limiting element 410 to move from the second end to the first end, the limiting element 410 no longer restricts the guide slope 302, so the friction block 300 can exit toward the second position, that is, the friction block 300 can move toward the outside of the sleeve 200, the contact force between the friction block 300 and the surface of the fixed pull rod decreases, the friction between the friction block 300 and the fixed pull rod will also decrease, and the buckle 100 can be pulled out from the fixed pull rod.

[0034] It should be understood that when the control element 420 drives the limiting element 410 to move from the first end toward the second end, the limiting element 410 moves to the locked position; when the control element 420 drives the limiting element 410 to move from the second end toward the first end, the limiting element 410 moves to the unlocked position.

[0035] Reference Figure 3As shown, it can be understood that the control element 420 includes a first rod portion 421 and a second rod portion 422. The first rod portion 421 and the second rod portion 422 intersect to form an angle. The intersection point of the first rod portion 421 and the second rod portion 422 is hinged to the buckle body 100. The first rod portion 421 extends to the outside of the buckle body 100, and the second rod portion 422 is movably connected to the limiting member 410. When the first rod portion 421 rotates around the hinge point to approach the buckle body 100, the second rod portion 421... 22 drives the limiting member 410 to move toward the first end. When the first rod 421 rotates around the hinge point to move away from the buckle body 100, the second rod 422 drives the limiting member 410 to move toward the second end. The first rod 421 is provided with a slot 423. When the first rod 421 moves away from the buckle body 100, the slot 423 is located on the outside of the buckle body 100. The slot 423 is fitted with a locking block 430, and the locking block 430 is located between the first rod 421 and the buckle body 100.

[0036] The control component 420 is hinged to the buckle body 100. Rotating the control component 420 drives the limiting component 410 to move. Since the limiting component 410 is fitted onto the friction block 300, the friction block 300 also restricts the direction of movement of the limiting component 410, i.e., the limiting component 410 moves along the axial direction of the sleeve 200. It should be understood that since the moving direction of the limiting component 410 is linear, while the control component 420 rotates, a relative displacement perpendicular to the axial direction of the sleeve 200 will occur between the control component 420 and the limiting component 410. Therefore, a movable connection is required between the control component 420 and the limiting component 410. Furthermore, for example, the control component 420 may have a slot, and the limiting component 410 may have a connecting rod that slides through the slot. Figure 4 The structure shown.

[0037] The control component 420 includes a first rod portion 421 and a second rod portion 422. The first rod portion 421 and the second rod portion 422 intersect to form an angle, which can reduce the distance that the first rod portion 421 extends to the outside of the buckle body 100, making the first rod portion 421 closer to the buckle body 100, and facilitating manual operation of rotating the first rod portion 421.

[0038] It is important to understand that in the above structure, when the second rod 422 drives the limiting member 410 to move from the first end toward the second end, that is, when the limiting member 410 moves to the locked position, the first rod 421 rotates around the hinge point to move away from the buckle body 100. Furthermore, the slot 423 is located on the outside of the buckle body 100, and a locking block 430 can be inserted into the slot 423. The locking block 430, located between the first rod 421 and the buckle body 100, will prevent the first rod 421 from rotating closer to the buckle body 100. In other words, the cooperation between the locking block 430 and the slot 423 can keep the limiting member 410 in the locked position.

[0039] It is understandable that the guide groove 210 has a margin along the axial direction of the sleeve 200, and the friction block 300 can move in the guide groove 210 along the axial direction of the sleeve 200.

[0040] The friction block 300 moves along the axial direction of the sleeve 200 in the guide groove 210, that is, the friction block 300 can move from the first end toward the second end, or from the second end toward the first end. When the buckle 100 is inserted into the fixed pull rod, the fixed pull rod moves inside the sleeve 200 in the direction from the first end toward the second end. At this time, the friction block 300 may be pushed by the contact of the fixed pull rod, or it may move from the first end toward the second end along the axial direction of the sleeve 200 in the guide groove 210 until it is blocked by the guide groove 210 and cannot move further.

[0041] When the control element 420 drives the limiting element 410 to move from the first end toward the second end, the limiting element 410 moves to the locked position. The limiting element 410 will also push the friction block 300 to move along the axial direction of the sleeve 200 from the first end toward the second end until it is blocked by the guide groove 210 and can no longer move.

[0042] After the butterfly buckle is fixed to the fixing rod, if the load on the template increases, the butterfly buckle tends to come off the fixing rod, that is, the fixing rod tends to move from the second end toward the first end relative to the buckle body 100. When the buckle body 100 is assembled, the friction block 300 moves along the axial direction of the sleeve 200 from the first end to the second end until it is blocked by the guide groove 210. When the fixed pull rod moves relative to the buckle body 100 from the second end to the first end, it will drive the friction block 300 to move along the axial direction of the sleeve 200 from the second end to the first end. At this time, the limiting member 410 is restricted by the control member 420 and remains relatively stationary with respect to the buckle body 100. However, relative movement will occur between the limiting member 410 and the friction block 300. That is, the limiting member 410 has a displacement relative to the friction block 300 from the first end to the second end. In other words, the limiting member 410 will further push the friction block 300 towards the inside of the sleeve 200 to increase the friction between the friction block 300 and the fixed pull rod, thereby achieving the effect of preventing detachment.

[0043] Understandably, a spring 440 is provided between the second rod portion 422 and the buckle body 100. The spring 440 is configured to drive the second rod portion 422 to rotate so as to maintain the limiting member 410 having a tendency to move toward the second end.

[0044] When installing the butterfly buckle, the first rod 421 needs to be rotated to move closer to the buckle body 100. At this time, the second rod 422 drives the limiting member 410 to move from the second end to the first end, and the friction block 300 will not obstruct the fixing rod from passing through the sleeve 200. After the butterfly buckle moves to the predetermined position, the first rod 421 needs to be rotated to move away from the buckle body 100. At this time, the second rod 422 drives the limiting member 410 to move from the first end to the second end. Therefore, the spring 440 is used to assist in driving the second rod 422 to rotate, so as to maintain the tendency of the limiting member 410 to move towards the second end. In actual operation, pressing the first rod 421 close to the buckle 100 and passing the buckle 100 through the fixed pull rod releases the force acting on the first rod 421. The spring 440 can then drive the second rod 422 to move toward the second end, causing the limiting member 410 to push the friction block 300 toward the inside of the sleeve 200, thus completing the contact between the friction block 300 and the fixed pull rod.

[0045] It is understandable that the guide slope 302 of the friction block 300 is provided with flanges 310 on both sides. The flanges 310 can abut against the outer surface of the sleeve 200 to prevent the guide slope 302 from extending into the inner side of the sleeve 200.

[0046] In some embodiments, the friction block 300 can be designed to be relatively long along the radial direction of the sleeve 200. Even if the friction block 300 is inserted into the sleeve 200, a portion of it will remain on the outside of the sleeve 200, preventing the friction block 300 from falling into the sleeve 200. In other embodiments, if the friction block 300 can be designed to be relatively long along the radial direction of the sleeve 200, the corresponding limiting member 410 also needs to be designed to be larger to fit onto the friction block 300. Therefore, the size of the friction block 300 can be shortened. At the same time, flange portions 310 are provided on both sides of the guide slope 302 of the friction block 300. The flange portions 310 abut against the outer surface of the sleeve 200 to prevent the friction block 300 from falling into the sleeve 200.

[0047] It is understandable that the roughness of the friction surface 301 is greater than that of the guide slope 302.

[0048] Since the guide slope 302 of the friction block 300 needs to have relative displacement with the limiting member 410 to control the movement of the friction block 300 toward the inside of the sleeve 200, in order to reduce the external force required for the movement of the limiting member 410, the roughness of the guide slope 302 can be reduced to be less than the roughness of the friction surface 301. It should be understood that the friction block 300 can be assembled from components of two different materials to form guide slope 302 and friction surface 301 with different roughnesses. Alternatively, the friction surface 301 and guide slope 302 can be made of the same material, but a corrugated pattern can be added to the friction surface 301 to increase its roughness, ultimately increasing the friction between the friction block 300 and the fixed tie rod.

[0049] It is understandable that the friction block 300 has a chamfer on the side facing the first end, and the chamfer is located on one side of the friction surface 301.

[0050] Since the limiting member 410 drives the friction block 300 to move by contacting the guide inclined surface 302, the limiting member 410 can easily drive the friction block 300 to move towards the inside of the sleeve 200. Conversely, the limiting member 410 cannot drive the friction block 300 away from the inside of the sleeve 200 and retract it. When the fixing rod is inserted into the sleeve 200, part of the friction block 300 may have already penetrated into the inside of the sleeve 200, blocking the fixing rod from passing through. A chamfer is provided on the side of the friction block 300 facing the first end. When the fixing rod is inserted into the sleeve 200, it passes out from the first end towards the second end. The fixing rod contacts the chamfer, squeezing the friction block 300 out of the sleeve 200. After the buckle body 100 moves to the predetermined position, the limiting member 410 is moved again to push the friction block 300 into contact with the fixing rod, completing the installation of the butterfly buckle.

[0051] It is understood that the fixing part 110 includes two arc-shaped slots 111, which are symmetrically arranged on the buckle body 100 with the central axis of the sleeve 200 as the axis of symmetry.

[0052] The arc-shaped groove 111 can be adapted to the steel pipe on the surface of the template, increasing the contact area between the buckle 100 and the steel pipe, which can better fix the steel pipe on the surface of the template and provide support and reinforcement for the template.

[0053] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A butterfly clasp, characterized in that, include: The buckle body (100) has a first end and a second end that are distributed opposite to each other, and the first end is provided with a fixing part (110). A sleeve (200) penetrates the buckle body (100) and is arranged from the first end toward the second end. The side wall of the sleeve (200) is provided with a plurality of guide grooves (210), which are distributed around the circumference of the sleeve (200) and penetrate the side wall of the sleeve (200). Multiple friction blocks (300) are evenly distributed around the circumference of the sleeve (200), and one end of each friction block (300) facing the center of the sleeve (200) can penetrate into the inner side of the sleeve (200). Each friction block (300) is disposed in a guide groove (210) and slides in the guide groove (210). The side of the friction block (300) facing the center of the sleeve (200) is a friction surface (301), and the side of the friction block (300) away from the center of the sleeve (200) is a guide slope (302). Along the direction from the first end to the second end, the guide slope (302) gradually moves away from the center of the sleeve (200). An adjustment assembly (400) includes a limiting member (410) and a control member (420). The limiting member (410) is fitted onto a plurality of friction blocks (300) and contacts the guide slope (302). The control member (420) is connected to the limiting member (410) to drive the limiting member (410) to move axially along the sleeve (200), so that the limiting member (410) can drive the friction blocks (300) to move radially along the sleeve (200) to a first position or a second position. In the first position, the plurality of friction blocks (300) are inserted into the inner side of the sleeve (200).

2. The butterfly clasp according to claim 1, characterized in that, The control element (420) includes a first rod portion (421) and a second rod portion (422). The first rod portion (421) and the second rod portion (422) intersect to form an angle. The intersection point of the first rod portion (421) and the second rod portion (422) is hinged to the buckle body (100). The first rod portion (421) extends to the outside of the buckle body (100). The second rod portion (422) is movably connected to the limiting member (410). When the first rod portion (421) rotates around the hinge point to approach the buckle body (100), the second rod portion (422) drives the limiting member. (410) When the first rod (421) moves toward the first end and rotates around the hinge point to move away from the buckle (100), the second rod (422) drives the limiting member (410) to move toward the second end. The first rod (421) is provided with a slot (423). When the first rod (421) moves away from the buckle (100), the slot (423) is located outside the buckle (100). The slot (423) is fitted with a locking block (430), and the locking block (430) is located between the first rod (421) and the buckle (100).

3. The butterfly clasp according to claim 2, characterized in that, Along the axial direction of the sleeve (200), the guide groove (210) is provided with a margin, and the friction block (300) is able to move in the guide groove (210) along the axial direction of the sleeve (200).

4. The butterfly clasp according to claim 2, characterized in that, A spring (440) is provided between the second rod (422) and the buckle (100), the spring (440) being configured to drive the second rod (422) to rotate so as to maintain the limiting member (410) having a tendency to move toward the second end.

5. The butterfly clasp according to claim 4, characterized in that, The friction block (300) has flanges (310) on both sides of the guide slope (302). The flanges (310) can abut against the outer surface of the sleeve (200) to prevent the guide slope (302) from extending into the inner side of the sleeve (200).

6. The butterfly clasp according to claim 1, characterized in that, The roughness of the friction surface (301) is greater than the roughness of the guide slope (302).

7. The butterfly clasp according to claim 1, characterized in that, The friction block (300) has a chamfer on one side facing the first end, and the chamfer is located on one side of the friction surface (301).

8. The butterfly clasp according to claim 1, characterized in that, The fixing part (110) includes two arc-shaped slots (111), which are symmetrically arranged on the buckle body (100) with the central axis of the sleeve (200) as the axis of symmetry.

Images