CN212297151U

CN212297151U - Connecting fastener

Info

Publication number: CN212297151U
Application number: CN202021188929.9U
Authority: CN
Inventors: 蒯家波; 任永亮
Original assignee: Anhui Jincen Composites Co ltd
Current assignee: Anhui Jincen Composites Co ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-01-05
Anticipated expiration: 2030-06-23

Abstract

The utility model belongs to the technical field of machinery, in particular to connect fastener, including the base plate, be equipped with the connecting hole that runs through the plate body on the base plate, the bottom hole of connecting hole constitutes the expansion link along downwardly extending, and the cross-section outline of expansion link is whole to be multilateral shape. The utility model discloses an expansion link can constitute the spacing cooperation of circumferential direction with treating the connecting hole to avoid connecting the fastener and rotate in step with it when rotatory screw, make the installation and the dismantlement of screw more convenient.

Description

Connecting fastener

Technical Field

The utility model belongs to the technical field of machinery, in particular to connect fastener.

Background

In the prior art, an expansion nut is usually clamped into a connection hole reserved on a sheet metal part of an automobile body, and then a screw is adopted to penetrate through connection holes of a bumper and a fender to be matched with the expansion nut, so that an expansion part of the expansion nut is expanded, and fastening and installation of parts are realized. However, the expansion part of the conventional expansion nut is generally cylindrical or conical, and when the screw is rotated, the expansion nut is rotated, which makes it difficult to detach the components.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a be connected fastener convenient to installation and dismantlement.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the connecting clamping piece comprises a base plate, wherein a connecting hole penetrating through a plate body is formed in the base plate, a hole in the bottom of the connecting hole extends downwards to form an expansion rod, and the outer contour of the cross section of the expansion rod is integrally polygonal.

Compared with the prior art, the utility model discloses there are following technological effect: the expansion rod can form circumferential rotation limiting fit with the connecting hole to be connected, so that the connecting clamping piece is prevented from rotating synchronously with the rotating screw when the screw rotates, and the screw is more convenient to install and disassemble.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

fig. 1 and 2 are schematic perspective views of the present invention;

fig. 3 is a front view of the present invention;

FIG. 4 is a cross-sectional view B-B of FIG. 3;

FIGS. 5 and 6 are schematic diagrams showing the fitting of the split and the hole to be connected in embodiment 1;

FIGS. 7 and 8 are schematic diagrams showing the matching of the split and different holes to be connected in embodiment 2;

in the figure: A. the connecting structure comprises a to-be-connected hole, a base plate 10, a connecting hole 11, an expansion rod 20, a clamping section 20a, a leading-in section 20b, a butting wall surface 21, an anti-rotation wall surface 22, a split 23 and a conical surface 25.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.

A connecting clamping piece comprises a base plate 10, a connecting hole 11 penetrating through a plate body is formed in the base plate 10, a hole in the bottom of the connecting hole 11 extends downwards to form an expansion rod 20, and the outer contour of the cross section of the expansion rod 20 is polygonal overall. The connecting hole 11 is used for being in threaded fit with a screw, the expansion rod 20 with the overall polygonal outer contour and the hole A to be connected form circumferential limiting fit, and therefore when the screw is installed or disassembled, the wall body of the expansion rod 20 is in abutting fit with the hole wall of the hole A to be connected, and therefore the connecting clamping piece and the screw are prevented from rotating synchronously to affect the assembly and disassembly efficiency of parts.

As shown in fig. 4 to 8, the expansion link 20 includes an abutting wall surface 21 which is in abutting engagement with the hole wall of the hole a to be connected and an anti-rotation wall surface 22 which is in contact with or separate from the hole wall of the hole a to be connected, and the abutting wall surface 21 and the anti-rotation wall surface 22 are arranged at an included angle. When the connecting clamp is used, the abutting wall surface 21 is abutted and matched with the hole wall of the hole A to be connected, and therefore the connecting clamp is matched with the hole A to be connected. When the screw is rotated, the anti-rotation wall surface 22 or the connecting edges of the abutting wall surface 21 and the anti-rotation wall surface 22 are in contact with the hole wall of the hole A to be connected and form anti-rotation force with opposite directions, and the expansion rod 20 is limited to rotate relative to the hole A to be connected, so that the connecting clamping piece is prevented from continuously and synchronously rotating with the screw.

Preferably, as shown in fig. 5 to 8, the abutment wall surface 21 is formed of parallel wall surfaces correspondingly disposed on both sides of the connection hole 11, and further, the abutment wall surface 21 is formed of two parallel wall surfaces symmetrically disposed on both sides of the connection hole 11.

As shown in fig. 5-8, in a natural state, the outer contour dimension of the abutting wall surface 21 is larger than the dimension of the wall surface corresponding to the hole a to be connected, and when the connecting clip is clamped into the hole a to be connected, the abutting wall surface 21 will contract inwards under the squeezing action of the hole a to be connected, so as to realize the clamping fit of the two.

In order to ensure the concentricity of the connecting clamping piece and the hole A to be connected and ensure that the stress is more uniform when the connecting clamping piece is connected with the hole A to be connected, the vertical surfaces of the abutting wall surfaces 21 are intersected at the hole core line of the connecting hole 11.

Preferably, the expansion rod 20 is composed of a plurality of segments 23, and the adjacent surface of each segment 23 is arranged in an open shape with a small distance from the side adjacent to the base plate 10 and a large distance from the side far from the base plate 10. This state is the natural state, and when using, the split 23 is close to and constitutes the spacing cooperation of leaning on of circumference with treating connecting hole A under treating connecting hole A's effect.

The expansion rod 20 comprises a clamping section 20a arranged close to the substrate 10, the rod body of the clamping section 20a is arranged in a claw shape expanding outwards, the rod length of the clamping section 20a is larger than the plate thickness of the plate to be connected, namely the rod length of the clamping section 20a is larger than the axial size of the plate to be connected A, so that the connecting clamp and the plate to be connected are reliably clamped. The outer contour of the rod body of the clamping section 20a close to the substrate 10 is small, and the outer contour of the rod body far away from the substrate 10 is large, so that the expansion rod 20 can be prevented from being easily separated from the to-be-connected hole A when in use.

The outer end of the clamping section 20a is connected with a leading-in section 20b, the thickness of the rod body of the leading-in section 20b is gradually reduced from the base part to the outside, and the end part is in smooth transition. When in use, the expansion rod 20 is matched with the hole wall of the hole A to be connected, and the expansion rod can be conveniently guided into the hole A to be connected.

In order to facilitate the matching of the connecting clamping piece and the screw, the inner wall surface of each split 23 is provided with a conical surface 25 with a large upper part and a small lower part, and the central line of each conical surface 25 is superposed with the hole core line of the connecting hole 11.

In embodiment 1, the cross-sectional outer contour of the expansion rod 20 is a quadrilateral with rounded transition of adjacent sides, and is composed of two split segments 23, the outer wall surface of the split segment 23 is a contact wall surface 21, the side wall surface is a rotation-preventing wall surface 22, and the middle part of the inner wall is provided with a conical surface 25. As shown in fig. 5 and 6, when the embodiment 1 is used for matching with a square round hole, the radius of the transition round of the abutting wall surface 21 and the rotation-preventing wall surface 22 should be larger than that of the round of the hole a to be connected, so as to facilitate the assembly of the connecting clip.

Claims

1. The utility model provides a connect fastener, includes base plate (10), is equipped with connecting hole (11) that run through the plate body on base plate (10), and the bottom hole of connecting hole (11) constitutes expansion link (20), its characterized in that along downwardly extending: the expansion rod (20) has a polygonal cross-sectional outer contour as a whole.

2. The connection clip of claim 1, wherein: the expansion rod (20) comprises an abutting wall surface (21) which is abutted to and matched with the hole wall of the to-be-connected hole (A) and an anti-rotation wall surface (22) which is contacted with or separated from the hole wall of the to-be-connected hole (A), and the abutting wall surface (21) and the anti-rotation wall surface (22) are arranged at an included angle.

3. The connection clip of claim 2, wherein: the perpendicular surfaces of the abutment wall surfaces (21) intersect at the hole core line of the connection hole (11).

4. The connection clip of claim 2, wherein: the expansion rod (20) is composed of a plurality of segments (23), and the adjacent surfaces of the segments (23) are arranged in an opening shape with small side distance adjacent to the substrate (10) and large side distance away from the substrate (10).

5. The connection clip of claim 4, wherein: the expansion rod (20) comprises a clamping section (20a) arranged adjacent to the base plate (10), the rod body of the clamping section (20a) is arranged in a claw shape expanding outwards, and the rod length of the clamping section (20a) is larger than the plate thickness of the plate to be connected.

6. The connection clip of claim 5, wherein: the outer end of the clamping section (20a) is connected with a leading-in section (20b), the thickness of the rod body of the leading-in section (20b) is gradually reduced from the base part to the outside, and the end part is in smooth transition.

7. The connection clip of claim 6, wherein: the inner wall surface of each split (23) is provided with a conical surface (25) with a large top and a small bottom, and the center line of each conical surface (25) is superposed with the hole core line of the connecting hole (11).

8. The connection clip of claim 7, wherein: the outer profile of the section of the expansion rod (20) is a quadrangle with round corner transition of adjacent sides, and the expansion rod is composed of two split parts (23), the outer wall surface of each split part (23) is a butting wall surface (21), the side wall surface is an anti-rotation wall surface (22), and the middle part of the inner wall is provided with a conical surface (25).