One-hand rope adjusting type shoe and adjusting buckle

The single-hand adjustable lace system addresses the stability and convenience issues of traditional laces by using a configuration with slots and lace elements for secure fixation and single-handed adjustment.

CN223094882UActive Publication Date: 2025-07-15NIFCO TAIWAN
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Patent Information

Application Number
CN202422565369.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-23
Publication Date
2025-07-15
Estimated Expiration
2034-10-23

AI Technical Summary

Technical Problem

The existing buckles are inconvenient to adjust the tightness of the rope, especially one-handed operation, which affects the user experience.

Method used

A one-hand rope adjustment shoe is designed, and the steps of the groove body, the first step buckle rope part and the second step buckle rope part are arranged in the adjustment buckle to achieve stable fixation and one-hand control, thereby improving operation convenience.

Benefits of technology

The stable fixation of the rope strap on the adjustment buckle is achieved, allowing the user to easily adjust the tightness with one hand, significantly improving the convenience of operation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a one-hand rope adjusting type shoe and an adjusting buckle. The adjusting buckle comprises a top surface and a bottom surface which are positioned on opposite sides; the adjusting buckle comprises a connecting part, two through groove bodies, two first step rope buckling parts and two second step rope buckling parts, wherein the two groove bodies are connected to the two opposite sides of the connecting part respectively, the two first step rope buckling parts are formed in the two groove bodies respectively, and the two second step rope buckling parts are formed in the two groove bodies respectively. The connecting part is provided with a first end and a second end which are respectively positioned at two opposite ends; the groove bottoms of the two groove bodies are adjacent to the first end, and the groove openings of the two groove bodies are adjacent to the second end. And the two first-step rope buckling parts are adjacent to the bottom surface and are respectively adjacent to the two groove bottoms. And the two second-step rope buckling parts are adjacent to the top surface and are respectively adjacent to the two notches. Therefore, by means of the structure of the adjusting buckle, a user can control the adjusting buckle with one hand conveniently, and the operation convenience of the adjusting buckle is obviously improved.
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Description

Technical Field

[0001] The utility model relates to a buckle, in particular to a single-handed rope-adjusting type shoe and an adjusting buckle. Background Art

[0002] A wearable object is often equipped with a buckle to adjust the tightness of a rope. Therefore, how to stably position the rope on the buckle and improve the operation convenience between the buckle and the rope has become one of the important development directions in this field. Thus, the applicant believes that the above defects can be improved, and thus has painstakingly studied and combined with the application of scientific principles, and finally proposed a utility model with reasonable design and effective improvement of the above defects. Summary of the Utility Model

[0003] The purpose of the embodiment of the utility model is to provide a single-handed rope-adjusting type shoe and an adjusting buckle, which can effectively improve the defects that may occur in the existing buckle.

[0004] The embodiment of the utility model discloses a single-handed rope-adjusting type shoe, which comprises: a shoe body, which includes a instep section and two heel sections respectively located on opposite sides of the instep section; an adjusting buckle, which has a top surface and a bottom surface located on opposite sides along a thickness direction, the adjusting buckle is installed on the instep section of the shoe body, and the bottom surface of the adjusting buckle faces the instep section; wherein, the adjusting buckle includes: a connecting part, which has a first end and a second end respectively located at opposite ends, and the second end is closer to any one of the heel sections than the first end; two slots, which are respectively connected to opposite sides of the connecting part; wherein, each slot is through along the thickness direction, and the slot bottoms of the two slots are close to the first end, and the slot openings of the two slots are close to the second end; two first-stage rope buckling parts, which are respectively formed inside the two slots and close to the bottom surface, and the two first-stage rope buckling parts are respectively close to the slot bottoms of the two slots; two second-stage rope buckling parts, which are respectively formed inside the two slots and close to the top surface, and the two second-stage rope buckling parts are respectively close to the slot openings of the two slots; and a rope, which is installed on the two heel sections and has two adjusting sections located above the instep section; wherein, the two adjusting sections respectively pass through the adjusting buckle from the bottom surface along the two first-stage rope buckling parts and the slot bottoms of the two slots to be in a to-be-adjusted position; wherein, when the two adjusting sections are in the to-be-adjusted position, the two adjusting sections can be pulled in a direction away from the adjusting buckle, and respectively pass through the two second-stage rope buckling parts from the top surface, and are respectively limited in the two first-stage rope buckling parts and respectively pass out of the slot openings of the two slots to be in a fixed-point position, so that each adjusting section is buckled on the corresponding first-stage rope buckling part and clamped between the corresponding first-stage rope buckling part and the second-stage rope buckling part.

[0005] Optionally, a threading hole is formed between each first-stage rope buckling portion and the corresponding bottom of the groove for the corresponding adjustment section to penetrate from the bottom surface; each first-stage rope buckling portion is recessed in a direction away from the corresponding bottom of the groove to form a rope embedding opening communicating with the threading hole; wherein, when any adjustment section is located at the fixed point position, the end of the adjustment section is deformed by compression and is embedded and positioned in the rope embedding opening of the corresponding first-stage rope buckling portion.

[0006] Optionally, the caliber of each rope embedding opening is tapered in a direction away from the corresponding bottom of the groove.

[0007] Optionally, in each groove body, a clamping gap smaller than the rope diameter of the rope belt is provided between the first-stage rope buckling portion and the second-stage rope buckling portion, so that when the corresponding adjustment section is located at the fixed point position, it is clamped between the first-stage rope buckling portion and the second-stage rope buckling portion.

[0008] Optionally, in each groove body, the clamping gap forms an arrangement angle of between 15 degrees and 60 degrees with the thickness direction.

[0009] Optionally, each groove body has two groove side walls respectively connected to both ends of the bottom of the groove, and the distance between the two groove side walls of each groove body is tapered from the bottom of the groove towards the groove opening.

[0010] Optionally, in each groove body, the first-stage rope buckling portion is connected to the two groove side walls, the second-stage rope buckling portion includes two protrusions respectively connected to the two groove side walls, and the two protrusions are spaced apart from each other.

[0011] Optionally, the adjustment buckle includes a mounting portion adjacent to the first end of the connecting portion; the shoe body includes a positioning webbing, and both ends of the positioning webbing are respectively mounted on the instep section and the mounting portion of the adjustment buckle.

[0012] Optionally, each groove body defines a middle dividing plane, and the middle dividing planes of the two groove bodies intersect on one side of the connecting portion away from the second end and adjacent to the first end, so that an included angle of between 15 degrees and 60 degrees is formed between the two middle dividing planes.

[0013] An embodiment of the present invention also discloses an adjustment buckle having a top surface and a bottom surface located on opposite sides along a thickness direction. The adjustment buckle includes: a connecting portion having a first end and a second end respectively located at opposite ends; two groove bodies respectively connected to opposite sides of the connecting portion; wherein, each groove body is through along the thickness direction, the bottoms of the two groove bodies are adjacent to the first end, and the openings of the two groove bodies are adjacent to the second end; two first-stage rope buckling portions are respectively formed within the two groove bodies and adjacent to the bottom surface, and the two first-stage rope buckling portions are respectively adjacent to the bottoms of the two groove bodies; two second-stage rope buckling portions are respectively formed within the two groove bodies and adjacent to the top surface, and the two second-stage rope buckling portions are respectively adjacent to the openings of the two groove bodies.

[0014] In summary, the single-handed rope-adjusting type shoes and adjusting fasteners disclosed in the embodiments of the present invention can, through the structural configuration among the two groove bodies, the two first-stage rope-fastening parts and the two second-stage rope-fastening parts (for example: the first-stage rope-fastening part and the second-stage rope-fastening part within each groove body are generally arranged in a stepped manner), enable the rope belt to be stably positioned on the adjusting fastener, and at the same time, facilitate the user to control its tightness in a single-handed manner, so as to significantly improve the operation convenience between the adjusting fastener and the rope belt.

[0015] For a further understanding of the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, these descriptions and drawings are only used to illustrate the present invention and do not impose any limitation on the protection scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the single-handed rope-adjusting type shoes according to the embodiment of the present invention.

[0017] Figure 2 It is a three-dimensional schematic diagram of the adjusting fastener according to the embodiment of the present invention.

[0018] Figure 3 It is Figure 2 a three-dimensional schematic diagram from another perspective.

[0019] Figure 4 It is Figure 2 a plan schematic diagram.

[0020] Figure 5 It is Figure 2 a sectional schematic diagram along the section line V-V.

[0021] Figure 6 It is a plan schematic diagram of the single-handed rope-adjusting type shoes according to the embodiment of the present invention when the rope belt is in the position to be adjusted.

[0022] Figure 7 It is Figure 6 a partial sectional schematic diagram.

[0023] Figure 8 It is Figure 6 a schematic diagram of the subsequent action.

[0024] Figure 9 It is a plan schematic diagram of the single-handed rope-adjusting type shoes according to the embodiment of the present invention when the rope belt is in the fixed position.

[0025] Figure 10 It is Figure 9 a partial sectional schematic diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following is to illustrate the implementation mode of the "single - hand rope - adjusting type shoes and adjusting fasteners" disclosed by the present utility model through specific specific embodiments. Those skilled in the art can understand the advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present utility model. Additionally, the drawings of the present utility model are only for simple schematic illustration and are not drawn according to actual dimensions, hereby stating in advance. The following implementation modes will further detail the relevant technical content of the present utility model, but the disclosed content is not used to limit the protection scope of the present utility model.

[0027] It should be understood that although terms such as "first", "second", "third", etc. may be used herein to describe various components or features, these components or features should not be limited by these terms. These terms are mainly used to distinguish one component from another, or one feature from another. Additionally, the term "or" used herein should, depending on the actual situation, possibly include any one or a combination of more of the associated listed items.

[0028] Please refer to Figures 1 to 10 as shown, which is an embodiment of the present utility model. As Figure 1 shown, this embodiment discloses a single - hand rope - adjusting type shoe 100, which includes a shoe body 2, an adjusting fastener 1 installed on the shoe body 2, and a cord 3 connecting the shoe body 2 and the adjusting fastener 1. It should be noted first that in this embodiment, the single - hand rope - adjusting type shoe 100 can, through the structural configuration of the adjusting fastener 1, enable the cord 3 to be stably positioned in the adjusting fastener 1 and at the same time facilitate the user to control its tightness with one hand, thereby significantly improving the operation convenience between the adjusting fastener 1 and the cord 3.

[0029] In addition, although the adjusting fastener 1 in this embodiment is described in combination with the shoe body 2 and the cord 3, the present utility model is not limited thereto. For example, in other embodiments not shown in the present utility model, the adjusting fastener 1 can be applied alone (such as for sale) or used in combination with other components according to actual needs; for example, the adjusting fastener 1 can be combined with clothing (such as clothes or pants), a bag (such as a backpack, leather bag, or handbag), or bicycle accessories (such as a water bottle, tool bucket, or storage bag).

[0030] In this embodiment, the shoe body 2 includes a dorsal foot section 21, two heel sections 22 respectively located on opposite sides of the dorsal foot section 21, and a positioning webbing 23 mounted on the dorsal foot section 21. Among them, the adjustment buckle 1 can be mounted on the dorsal foot section 21 of the shoe body 2 through the positioning webbing 23, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the adjustment buckle 1 can also be mounted on the dorsal foot section 21 of the shoe body 2 by other components according to actual needs.

[0031] Furthermore, in this embodiment, the cord 3 is an elastic cord, so that the cord diameter of the cord 3 can be compressed and reduced, and the cord diameter of the cord 3 returns to the initial value after being uncompressed, but the present invention is not limited thereto. The cord 3 is mounted on the two heel sections 22 and has two adjustment sections 31 located above the dorsal foot section 21, and the two adjustment sections 31 are equivalent to the parts of the cord 3 passing through the adjustment buckle 1, and the part of the cord 3 between each adjustment section 31 and a corresponding heel section 22 is defined as a restraint section 32. In addition, the ends of the two adjustment sections 31 can be fixed together according to actual needs to facilitate the user's operation, but the present invention is not limited thereto.

[0032] More specifically, as Figures 1 to 5 shown, the adjustment buckle 1 is an integrally formed single-piece structure, and the adjustment buckle 1 has a top surface 1a and a bottom surface 1b located on opposite sides along a thickness direction T. The bottom surface 1b of the adjustment buckle 1 faces the dorsal foot section 21 (such as: Figure 6 and Figure 7 ), and in this embodiment, the thickness direction T is described as perpendicular to the top surface 1a, but the present invention is not limited thereto.

[0033] In this embodiment, the adjustment buckle 1 includes a connecting portion 11, two groove bodies 12 respectively connected to opposite sides of the connecting portion 11, two first-stage cord buckling portions 13 respectively formed in the two groove bodies 12, two second-stage cord buckling portions 14 respectively formed in the two groove bodies 12, and a mounting portion 15 connected to the two groove bodies 12.

[0034] The connecting portion 11 has a first end 111 and a second end 112 respectively located at opposite ends, and the second end 112 is closer to any one of the heel sections 22 than the first end 111. In this embodiment, the top surface of the connecting portion 11 is generally trapezoidal, and the first end 111 is located at the upper base of the trapezoid, and the second end 112 is located at the lower base of the trapezoid.

[0035] In this embodiment, the two trough bodies 12 and their internal structures are symmetrically arranged with respect to the connecting portion 11 in a mirror image manner, and the two adjusting segments 31 of the cord 3 respectively pass through the two trough bodies 12. Furthermore, the mounting portion 15 is adjacent to the first end 111 of the connecting portion 11 (for example, the mounting portion 15 is generally U-shaped and its two ends are respectively connected to the outer sides of the two trough bodies 12), and the two ends of the positioning webbing 23 are respectively mounted on the instep segment 21 and the mounting portion 15 of the adjusting buckle 1.

[0036] Furthermore, in this embodiment, each trough body 12 defines a median plane P (parallel to the thickness direction T), and the median planes P of the two trough bodies 12 intersect on the side of the connecting portion 11 that is far from the second end 112 and adjacent to the first end 111, so that an included angle σ12 between 15 degrees and 60 degrees (such as 20 degrees to 45 degrees) is formed between the two median planes P, but the present invention is not limited thereto.

[0037] Furthermore, each trough body 12 is penetrating along the thickness direction T, and the trough bottoms 121 of the two trough bodies 12 are adjacent to the first end 111, while the trough openings 122 of the two trough bodies 12 are adjacent to the second end 112. Furthermore, each trough body 12 has two trough side walls 123 respectively connected to both ends of the trough bottom 121, and the distance between the two trough side walls 123 of each trough body 12 tapers from the trough bottom 121 towards the trough opening 122, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the two trough side walls 123 of each trough body 12 may also be substantially parallel to each other.

[0038] Each first-stage cord buckling portion 13 is connected to the two trough side walls 123 of the corresponding trough body 12, and the two first-stage cord buckling portions 13 are respectively adjacent to the trough bottoms 121 of the two trough bodies 12 and also adjacent to the bottom surface 1b of the adjusting buckle 1. That is to say, the first-stage cord buckling portions 13 and the second-stage cord buckling portions 14 within each trough body 12 are generally arranged in a stepped manner, so as to stably hold the adjusting segment 31 passing through the trough body 12.

[0039] In this embodiment, a cord threading hole 131 is formed by enclosing between each first-stage cord buckling portion 13 and the corresponding trough bottom 121, and the aperture of each cord threading hole 131 is larger than the cord diameter of the cord 3 (such as Figure 6 and Figure 7 ), for the corresponding adjusting segment 31 to penetrate into the corresponding trough body 12 from the bottom surface 1b.

[0040] Furthermore, each of the first-stage rope buckling portions 13 is recessed in a direction away from the corresponding bottom 121 of the groove to form a rope-inserting opening 132 communicating with the rope-passing hole 131. Wherein, the caliber of each rope-inserting opening 132 is tapered in a direction away from the corresponding bottom 121 of the groove, so that the caliber of each rope-inserting opening 132 can gradually shrink to be smaller than the rope diameter of the rope belt 3, but the present invention is not limited thereto.

[0041] Two of the second-stage rope buckling portions 14 are connected to at least one of the groove side walls 123 of the corresponding groove body 12, and the two second-stage rope buckling portions 14 are respectively adjacent to the groove openings 122 of the two groove bodies 12 and also adjacent to the top surface 1a of the adjusting buckle 1. In this embodiment, each of the second-stage rope buckling portions 14 includes two protrusions 141 respectively connected to the two groove side walls 123, and the two protrusions 141 of each second-stage rope buckling portion 14 are arranged at intervals and separated by a distance smaller than the rope diameter.

[0042] More specifically, in each groove body 12, there is a rope-clamping gap G smaller than the rope diameter between the first-stage rope buckling portion 13 and the second-stage rope buckling portion 14, and the rope-clamping gap G may optionally form an arrangement angle σ of between 15 degrees and 60 degrees with the thickness direction T, but the present invention is not limited thereto.

[0043] As described above, the two adjusting sections 31 respectively pass through the adjusting buckle 1 from the bottom surface 1b along the two first-stage rope buckling portions 13 and the bottom 121 of the two groove bodies 12 to be in a position to be adjusted (such as: Figure 6 and Figure 7 ). Furthermore, when the two adjusting sections 31 are in the position to be adjusted, the two adjusting sections 31 can be pulled in a direction away from the adjusting buckle 1 (such as Figure 8 : which is equivalent to increasing the length of each adjusting section 31 and shortening the length of each restraining section 32), and respectively pass through the two second-stage rope buckling portions 14 from the top surface 1a, and are respectively limited in the two first-stage rope buckling portions 13 and respectively pass out of the groove openings 122 of the two groove bodies 12 to be in a fixed-point position (such as: Figure 9 and Figure 10 ).

[0044] Wherein, such as Figure 9 and Figure 10As shown, when any one of the adjusting segments is at the fixed point position, each adjusting segment 31 is buckled to the corresponding first-stage rope buckling portion 13 (for example, the end of the adjusting segment 31 is deformed by pressing and is fitted and positioned at the rope embedding opening 132 corresponding to the first-stage rope buckling portion 13), and is clamped between the corresponding first-stage rope buckling portion 13 and the second-stage rope buckling portion 14 (for example, the adjusting segment 31 is clamped between the first-stage rope buckling portion 13 and the second-stage rope buckling portion 14).

[0045] [Technical effects of the embodiments of the present utility model]

[0046] In summary, for the single-handed rope-adjusting type shoes and adjusting fasteners disclosed in the embodiments of the present utility model, through the structural configuration among the two slots, the two first-stage rope buckling portions, and the two second-stage rope buckling portions (for example, the first-stage rope buckling portion and the second-stage rope buckling portion within each slot are generally distributed in a stepped manner), on the premise that the rope can be stably positioned at the adjusting fastener, it is also beneficial for the user to control the tightness in a single-handed manner, so as to significantly improve the operation convenience between the adjusting fastener and the rope.

[0047] The content disclosed above is only the optional and feasible embodiments of the present utility model, and does not limit the patent scope of the present utility model. Therefore, all equivalent technical changes made by using the content of the specification and drawings of the present utility model are included in the patent scope of the present utility model.

Claims

1. A single-handed rope-adjustable shoe, characterized in that, The single-handed rope-adjusting type shoes include: A shoe body, which includes a dorsal foot section and two heel sections respectively located on opposite sides of the dorsal foot section; An adjusting buckle, which has a top surface and a bottom surface located on opposite sides along a thickness direction. The adjusting buckle is installed on the dorsal foot section of the shoe body, and the bottom surface of the adjusting buckle faces the dorsal foot section; wherein, the adjusting buckle includes: A connecting portion, which has a first end and a second end respectively located at opposite ends, and the second end is closer to any one of the heel sections than the first end; Two slots, which are respectively connected to opposite sides of the connecting portion; wherein, each of the slots is in a through shape along the thickness direction, and the bottoms of the two slots are adjacent to the first end, while the openings of the two slots are adjacent to the second end; Two first-stage rope buckling portions, which are respectively formed inside the two slots and adjacent to the bottom surface, and the two first-stage rope buckling portions are respectively adjacent to the bottoms of the two slots; and Two second-stage rope buckling portions, which are respectively formed inside the two slots and adjacent to the top surface, and the two second-stage rope buckling portions are respectively adjacent to the openings of the two slots; and A rope, which is installed on the two heel sections and has two adjusting sections located above the dorsal foot section; wherein, the two adjusting sections respectively pass through the two first-stage rope buckling portions and the bottoms of the two slots from the bottom surface, and pass through the adjusting buckle to be in a position to be adjusted; Wherein, when the two adjusting sections are in the position to be adjusted, the two adjusting sections can be pulled in a direction away from the adjusting buckle, and respectively pass through the two second-stage rope buckling portions from the top surface, and are respectively limited in the two first-stage rope buckling portions and respectively pass out of the openings of the two slots to be in a fixed-point position, so that each adjusting section is buckled to the corresponding first-stage rope buckling portion and clamped between the corresponding first-stage rope buckling portion and the second-stage rope buckling portion.

2. The single-handed rope-adjusting type shoe according to claim 1, characterized in that A rope passing hole is formed between each first-stage rope buckling portion and the corresponding bottom of the slot for the corresponding adjusting section to penetrate into from the bottom surface; each first-stage rope buckling portion is recessed in a direction away from the corresponding bottom of the slot to form a rope embedding opening communicating with the rope passing hole; wherein, when any one of the adjusting sections is in the fixed-point position, the end of the adjusting section is pressed and deformed to be embedded and positioned in the rope embedding opening of the corresponding first-stage rope buckling portion.

3. The single-handed rope-adjusting type shoes according to claim 2, characterized in that, The caliber of each rope embedding opening is in a gradually shrinking shape in a direction away from the corresponding bottom of the slot.

4. The single-handed rope-adjusting type shoes according to claim 1, characterized in that, In each slot, a rope clamping gap smaller than the rope diameter of the rope is provided between the first-stage rope buckling portion and the second-stage rope buckling portion, so that when the corresponding adjusting section is in the fixed-point position, it is clamped between the first-stage rope buckling portion and the second-stage rope buckling portion.

5. The single-handed rope-adjusting type shoes according to claim 4, characterized in that, In each slot, the rope clamping gap forms an arrangement angle of between 15 degrees and 60 degrees with the thickness direction.

6. The single-handed rope-adjusting type shoes according to claim 1, characterized in that, Each of the groove bodies has two groove side walls respectively connected to two ends of the groove bottom, and the distance between the two groove side walls of each groove body tapers in a direction from the groove bottom towards the groove opening.

7. The single-handed rope-adjusting type shoe according to claim 6, wherein In each of the groove bodies, the first-stage rope buckling portion is connected to the two groove side walls, the second-stage rope buckling portion includes two protrusions respectively connected to the two groove side walls, and the two protrusions are arranged at intervals from each other.

8. The single-handed rope-adjusting type shoes according to claim 1, characterized in that, The adjusting buckle includes a mounting portion adjacent to the first end of the connecting portion; the shoe body includes a positioning webbing, and both ends of the positioning webbing are respectively mounted on the instep section and the mounting portion of the adjusting buckle.

9. The single-handed rope-adjusting type shoes according to claim 1, wherein Each of the groove bodies defines a middle dividing plane, and the middle dividing planes of the two groove bodies intersect at a side of the connecting portion away from the second end and adjacent to the first end, so that an included angle between the two middle dividing planes is between 15 degrees and 60 degrees.

10. An adjusting buckle, characterized in that, The adjusting buckle includes a top surface and a bottom surface located on opposite sides along a thickness direction, and the adjusting buckle includes: A connecting portion having a first end and a second end respectively located at opposite ends; Two groove bodies respectively connected to opposite sides of the connecting portion; wherein each of the groove bodies is through in the thickness direction, and the groove bottoms of the two groove bodies are adjacent to the first end, and the groove openings of the two groove bodies are adjacent to the second end; Two first-stage rope buckling portions respectively formed inside the two groove bodies and adjacent to the bottom surface, and the two first-stage rope buckling portions are respectively adjacent to the groove bottoms of the two groove bodies; and Two second-stage rope buckling portions respectively formed inside the two groove bodies and adjacent to the top surface, and the two second-stage rope buckling portions are respectively adjacent to the groove openings of the two groove bodies.