An expansion nut

Abstract

The present invention discloses an expansion nut. It includes a nut body and a bushing installed into a non-circular installation hole. An activity groove is axially provided at the inner end of the bushing, and the nut body is movably arranged in the activity groove. A through hole is axially provided at the outer end of the bushing, and the through hole is communicated with the activity groove. Elastic protrusions are provided on the outer circumference of the bushing. When the nut body moves in the activity groove to a position corresponding to the elastic protrusions, the nut body causes the elastic protrusions to tightly buckle the side wall of the installation hole. The structure of the present invention is simple and the design is reasonable. The nut body is installed into the installation hole through the bushing, the screw is locked with the nut body, and the nut body causes the elastic protrusions of the bushing to tightly buckle the step surface, achieving the purpose of fastening the screw. The installation is simple and the applicable range is wide. The installation hole and the outer wall of the bushing are in non-circular fit to avoid slipping when screwing the screw.

Description

Technical Field

[0001] The present invention relates to the technical field of expansion bolts, and specifically to an expansion nut. Background Art

[0002] At present, expansion bolts need to have a certain length, and the carrier used needs to have a certain thickness. Therefore, they are mostly used on walls. However, they cannot be used at positions with a thin thickness such as furniture boards and kitchen stove boards, and there is room for further improvement. Summary of the Invention

[0003] The purpose of the present invention is to provide an expansion nut with a wide range of applications.

[0004] The purpose of the present invention is achieved as follows.

[0005] An expansion nut includes a nut body and also includes a bushing installed in a non-round installation hole. The corresponding bushing is a non-round bushing. An activity groove is provided along the axial direction at the inner end of the bushing. The nut body is movably arranged in the activity groove. A through hole is provided along the axial direction at the outer end of the bushing. The through hole is communicated with the activity groove. Elastic protrusions are provided on the outer periphery of the bushing. When the nut body moves in the activity groove to a position corresponding to the elastic protrusions, the nut body causes the elastic protrusions to tightly buckle the side wall of the installation hole.

[0006] The above technical solution can be further improved as follows.

[0007] In a more specific solution, a plurality of slotted holes are provided at the inner end of the bushing. The slotted holes are communicated with the activity groove. The slotted holes divide the inner end of the bushing into at least two first support feet and at least two second support feet. The first support feet and the second support feet are arranged in an annular and alternating interval. A clamping protrusion for restricting the nut body is formed on the inner side of the first support feet. The inner sides of all the first support feet constitute the activity groove. The elastic protrusions are provided on the outer sides of the second support feet.

[0008] In a more specific solution, the length of the first support feet is greater than the length of the second support feet. A first inner guiding inclined surface and a first outer guiding inclined surface are formed at the end of the first support feet. A second outer guiding inclined surface is formed between the outer side of the end of the second support feet and the elastic protrusions. An elastic protrusion corresponding protrusion is provided on the inner side of the end of the second support feet. A second inner guiding inclined surface is formed between the inner side of the second support feet and the protrusion.

[0009] In a more specific solution, the axis of the through hole and the screw hole of the nut body are on the same straight line.

[0010] In a more specific solution, a plurality of grooves are provided on the side wall of the through hole.

[0011] In a more specific solution, the installation hole includes an inner section hole and an outer section hole. A step surface for the elastic protrusions to hook and buckle is formed between the inner section hole and the outer section hole.

[0012] In a more specific solution, the mounting hole is a non-round hole, and the corresponding ferrule is a non-cylindrical ferrule.

[0013] In a more specific solution, the outer periphery of the ferrule is adapted to the hole wall of the mounting hole. The outer periphery of the ferrule is provided with concave portions and convex portions, which are arranged in an annular and alternating interval between the concave portions and the convex portions. The maximum distance between the convex portion and the axis of the through hole is equal to the maximum distance between the elastic protrusion and the axis of the through hole.

[0014] In a more specific solution, the ferrule is made of an elastic material.

[0015] The structure of the present invention is simple and reasonable in design. The nut body is installed into the mounting hole through the ferrule, the screw is locked with the nut body, and the nut body makes the elastic protrusion of the ferrule buckle on the step surface, achieving the purpose of fastening the screw. The installation is simple and the applicable range is wide. The first leg and the second leg are elastic, and in cooperation with the first inner guiding inclined surface, the first outer guiding inclined surface and the second outer guiding inclined surface, it is convenient for the nut body to be installed into the ferrule and the ferrule to be installed into the mounting hole. The second inner guiding inclined surface is convenient for the nut body to limit the rebound of the elastic protrusion through the protruding portion, ensuring that the elastic protrusion tightly buckles on the step surface. The mounting hole and the outer wall of the ferrule are in non-round fit to avoid slipping when screwing the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural view of Embodiment 1.

[0017] Figure 2 It is a schematic structural view of another perspective of Embodiment 1.

[0018] Figure 3 It is a top view of Embodiment 1.

[0019] Figure 4 It is a bottom view of Embodiment 1.

[0020] Figure 5 It is a schematic structural view of the ferrule.

[0021] Figure 6 It is a schematic structural view of the mounting hole on the plate in Embodiment 1.

[0022] Figure 7 It is a schematic structural view of the installation of the nut body, the mounting hole and the ferrule in Embodiment 1.

[0023] Figure 8 For Figure 7 the sectional structural view in the A-A direction in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described below in conjunction with the drawings and embodiments:

[0025] Embodiment 1, see Figures 1-8As shown in the figure, an expansion nut includes a nut body 1 and a ferrule 2. A through hole 21 is provided axially at the outer end of the ferrule 2. Six grooves 25 are provided on the side wall of the through hole 21. Six slots 22 are provided at the inner end of the ferrule 2. The slots 22 divide the inner end of the ferrule 2 into three first feet 3 and three second feet 4. The first feet 3 and the second feet 4 are arranged in an annular and alternating interval. The inner sides of all the first feet 3 and the second feet 4 form a movable groove 20, and the movable groove 20 is communicated with the through hole 21.

[0026] The length of the first foot 3 is greater than the length of the second foot 4. A first inner guiding inclined surface 31 and a first outer guiding inclined surface 32 are formed at the end of the first foot 3. A clamping projection 33 is formed on the inner side of the first foot 3. An elastic projection 41 is formed on the outer side of the second foot 4. A second outer guiding inclined surface 42 is formed between the outer side of the end of the second foot 4 and the elastic projection 41. A convex portion 43 corresponding to the elastic projection 41 is provided on the inner side of the end of the second foot 4. A second inner guiding inclined surface 44 is formed between the inner side of the second foot 4 and the convex portion 43. The ferrule 2 is preferably made of elastic plastic. The convex portion 43 and the clamping projection 33 limit the position of the nut body 1 in the movable groove 20, preventing the nut body 1 from moving to the position corresponding to the elastic projection 41.

[0027] The nut body 1 is a hexagonal nut. The nut body 1 is installed in the movable groove 20 from the inner end of the ferrule 2, that is, the six faces of the nut body 1 are respectively abutted against the inner side faces of the first feet 3 and the second feet 4. The clamping projection 33 prevents the nut body 1 from disengaging from the movable groove 20. The axes of the through hole 21 and the screw hole of the nut body 1 are on the same straight line.

[0028] See Figure 6 , an installation hole 5 is formed on a carrier 6 such as a wall, a plate or a stove top panel. The installation hole 5 includes an inner section hole 51 and an outer section hole 52. A step surface 53 for hooking the elastic projection 41 is formed between the inner section hole 51 and the outer section hole 52. The thickness of the carrier 6 is more than 10 mm, preferably more than 16 mm. The installation hole 5 is milled on a plate such as a resin foam density board or a metal sandwich board (such as composed of upper and lower metal plates and a foaming layer in the middle) or a stone slab.

[0029] In this embodiment, see Figure 3 , Figure 4 and Figure 6 , the installation hole 5 is a non-round hole. The outer periphery of the ferrule 2 and the hole wall of the installation hole 5 are in concave-convex fit. The outer periphery of the ferrule 2 is provided with concave portions 23 and convex portions 24. The concave portions 23 and the convex portions 24 are arranged in an annular and alternating interval. The maximum distance between the convex portion 24 and the axis of the through hole 21 is equal to the maximum distance between the elastic projection 41 and the axis of the through hole 21 (that is, as Figure 3As shown by the dashed line in the figure, the arc surfaces outside all the elastic protrusions 41 are on the cylindrical surface with the same diameter as the highest point of the convex part 24, and the arc surfaces outside all the concave parts 23 are on the cylindrical surface with the same diameter). The six grooves 25 are arranged in a ring and are respectively arranged corresponding to the centers of the concave parts 23 or the convex parts 24, so that the ferrule 2 has better elasticity and avoids the alignment of the grooves 25 with the slots 22, resulting in a reduction in the structural strength of the ferrule 2 and making the ferrule 2 not easily damaged.

[0030] The nut body 1 and the ferrule 2 are pressed into the mounting hole 5 together, and a screw or a hook with an external thread passes through the through hole 21 and is threadedly connected to the nut body 1. During this process, the nut body 1 moves towards the through hole 21, and the nut body 1 presses the protruding part 43, that is, applies an outward force to the elastic protrusion 41, so as to ensure that the elastic protrusion 41 hooks the step surface 53 and ensure that the nut body 1 and the ferrule 2 will not be disengaged from the mounting hole 5.

Claims

1. An expansion nut, comprising a nut body, characterized in that: The ferrule is also provided with a ferrule that is installed in the non-circular mounting hole, wherein the inner end of the ferrule is provided with a movable groove along the axial direction, the nut body is movably arranged in the movable groove, the outer end of the ferrule is provided with a through hole along the axial direction, the through hole is connected to the movable groove, an elastic protrusion is provided on the outer periphery of the ferrule, the nut body moves in the movable groove to a position corresponding to the elastic protrusion, and the nut body causes the elastic protrusion to buckle the side wall of the mounting hole; The ferrule is made of an elastic material; a plurality of slots are provided on the inner end of the ferrule, the slots being connected to the movable slot, and the slots dividing the inner end of the ferrule into at least two first legs and at least two second legs, the first legs and the second legs being arranged in an annular shape and alternately spaced, a retaining protrusion for limiting the nut body being formed on the inner side of the first legs, so that the inner sides of all the first legs form movable slots, and an elastic protrusion is provided on the outer side of the second legs; The mounting hole comprises an inner hole and an outer hole, and a step surface for the elastic protrusion to hook is formed between the inner hole and the outer hole.

2. The expansion nut according to claim 1, characterized in that: The length of the first leg is greater than that of the second leg, and a first inner guide slope and a first outer guide slope are formed at the end of the first leg. A second outer guide slope is formed between the outer side of the end of the second leg and the elastic protrusion. An elastic protrusion corresponding to the protrusion is provided on the inner side of the end of the second leg, and a second inner guide slope is formed between the inner side of the second leg and the protrusion.

3. The expansion nut according to claim 1, characterized in that: The through hole and the screw hole axis of the nut body are on the same straight line.

4. The expansion nut according to claim 1, characterized in that: The side wall of the through hole is provided with a plurality of grooves.

5. The expansion nut according to claim 1, characterized in that: The outer periphery of the ferrule is adapted to the hole wall of the mounting hole, and the outer periphery of the ferrule is provided with recesses and protrusions, which are arranged in a ring shape and alternately spaced apart. The maximum distance between the protrusion and the axis of the through hole is equal to the maximum distance between the elastic protrusion and the axis of the through hole.

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