CN217950907U - Fastening piece - Google Patents

Abstract

The present application provides a fastener comprising: a head, a rib, and a pair of retaining arms, the head having a lower surface; the rib extends from the lower surface of the head in the axial direction of the fastener, and the end of the rib away from the head is a distal end; the pair of retaining arms extending from the distal end of the rib toward the head and away from each other; wherein each of the pair of retaining arms includes a retaining portion and an insertion portion, the retaining portion being closer to the head portion than the insertion portion, an inner surface of the insertion portion including a portion that curves toward an outer surface of the insertion portion. The fastener in this application can be with first part and the firm connection of second part to have certain intensity, it is not fragile in installation and dismantlement process.

Description

Fastening piece

Technical Field

The present application relates to a fastener, in particular a fastener for joining two parts having a hole.

Background

The fastener is capable of connecting multiple components together, such as two components having holes. The first member and the second member can be connected by aligning the holes of the first member and the second member and inserting the fastener into the holes of the first member and the second member.

Disclosure of Invention

The present application provides a fastener comprising: a head having a lower surface; a rib extending from a lower surface of the head in an axial direction of the fastener, an end of the rib remote from the head being a distal end; a pair of retaining arms extending from a distal end of the rib toward the head and away from each other; wherein each of the pair of retaining arms includes a retaining portion and an insertion portion, the retaining portion being closer to the head portion than the insertion portion, an inner surface of the insertion portion including a portion that curves toward an outer surface of the insertion portion.

According to the above fastener, the insertion portion includes an upper section and a lower section, the lower section is connected to the rib portion, the upper section is located between the lower section and the holding portion, and an inner surface of the lower section is a curved surface curved toward an outer surface of the lower section.

According to the above fastener, in an axial cross section of the fastener, the contour of the inner surface of the upper section is linear.

According to the fastener described above, the thickness of the proximal end of the lower section is greater than the thickness of the distal end of the lower section.

According to the fastener described above, in an axial cross-section of the fastener, the inner surface of the lower section comprises an arcuate segment that is convex in a direction away from the head, and the profile of the outer surface of the lower section comprises an arcuate segment.

According to the above fastener, the angle of inclination of the inner surface of the lower section with respect to the central axis of the fastener is greater than the angle of inclination of the inner surface of the upper section with respect to the central axis of the fastener.

According to the above fastener, the holding portion includes a holding portion upper portion and a holding portion lower portion, the holding portion lower portion is connected to the tip of the insertion portion, and the holding portion upper portion is connected to the holding portion lower portion, extends from the inside of the holding portion lower portion toward the rib portion by a certain distance, and then extends toward the head portion beyond the holding portion lower portion; so that a step is formed between an outer surface of an upper portion of the holding part and an upper surface of a lower portion of the holding part; the upper surface of the lower portion of the holding portion extends obliquely from the inside to the outside in a direction away from the head portion.

According to the above fastener, in an axial cross section of the fastener, the respective outer contours of the pair of retaining arms are on the same circumference.

According to the fastener described above, the rib portion has a pair of first side surfaces, the pair of holding arms are respectively connected to the bottoms of the pair of first side surfaces, and the pair of first side surfaces extend parallel to each other at the distal end of the rib portion.

According to the fastener, the fastener can be used for stably connecting the first component and the second component, has certain strength, and is not easy to damage in the mounting and dismounting processes.

Drawings

FIG. 1A is a perspective view of a fastener of the present application;

FIG. 1B is a perspective view of the fastener of FIG. 1A at another angle;

FIG. 1C is a front view of the fastener of FIG. 1A;

FIG. 1D is a left side view of the fastener of FIG. 1A;

FIG. 2A isbase:Sub>A cross-sectional view of the fastener of FIG. 1D taken along line A-A;

FIG. 2B is a cross-sectional view of the fastener of FIG. 1D taken along line B-B;

FIG. 3 is a perspective view of the fastener of the present application and two components to be joined;

FIG. 4A is a cross-sectional view of the fastener of the present application in a pre-installed position;

FIG. 4B is a cross-sectional view of the fastener of the present application in a installed position;

FIG. 5 is a cross-sectional view of a second embodiment of a fastener of the present application.

Detailed Description

Various embodiments of the present application will now be described with reference to the accompanying drawings, which form a part hereof. It should be understood that although directional terms, such as "front," "rear," "upper," "lower," "left," "right," etc., may be used herein to describe various example features and elements of the disclosure, these terms are used herein for convenience of description and are intended to be based on the example orientations shown in the figures. Because the embodiments disclosed herein can be arranged in a variety of orientations, these directional terms are used for purposes of illustration only and are not to be construed as limiting.

FIG. 1A is a perspective view of a fastener of the present application, FIG. 1B is another perspective view of the fastener of FIG. 1A, FIG. 1C is a front view of the fastener of FIG. 1A, and FIG. 1D is a left side view of the fastener of FIG. 1A. Fig. 1A-1D show the external structure of the fastener.

As shown in fig. 1A-1D, fastener 100 includes a head 101, a rib 102, and a pair of retaining arms 104 and 105. The fastener 100 has an axial direction and a radial direction. The head 101 is substantially circular plate-shaped and extends in a radial direction of the fastener 100, the head 101 having an upper surface 111 and a lower surface 112. The rib 102 is connected to the lower surface 112 of the head 101 and extends downward from the lower surface 112 of the head 101 up to perpendicular to the lower surface 112. I.e., extending in the axial direction of the fastener 100. The rib portion 102 is generally flat plate-shaped having a certain thickness, and has a pair of first side surfaces 113 and 114, and a pair of second side surfaces 115 and 116. The pair of first side surfaces 113 and 114 are parallel to each other so that the rib 102 has a uniform thickness. The profile of the pair of second side surfaces 115 and 116 is arcuate in axial cross-section of the fastener. Each of the pair of second sides 115 and 116 has a second upper side 126 and a second lower side 127, wherein the second upper side 126 extends generally in a vertical direction and the second lower side 127 extends downward and toward the central axis 150 of the fastener 100. The outer surface of the second side lower portion 127 is a smooth and continuous curved surface and is convex in a direction away from the central axis 150. The second side lower portion 127 forms a tapered guide capable of guiding the fastener 100 into the hole of the member to be connected. A pair of retaining arms 104 and 105 extend upwardly and away from each other from the bottom of a pair of first sides 113 and 114, respectively, of the rib 102. The distal ends of the pair of retaining arms 104 and 105 are spaced from the rib 102 such that the pair of retaining arms 104 and 105 can flex toward the rib 102.

A pair of retaining arms 104 and 105 are symmetrical with respect to rib 102, the structure of which will be described below in connection with retaining arm 105. The holding arm 105 includes a holding portion 121 and an insertion portion 122 connected in this order. The holding portion 121 is connected to the insertion portion 122 and positioned above the insertion portion 122. The insertion portion 122 has one end connected to the first side surface 114 and the other end connected to the holding portion 121.

The insertion part 122 includes an upper section 131 and a lower section 132, the upper section 131 is located above the lower section 132, and both ends of the upper section 131 are connected to the lower section 132 and the holding part 121, respectively. Wherein the inner surface 141 of the upper section 131 is substantially planar and the inner surface 142 of the lower section 132 is substantially arcuate and convex downward. The outer surface 143 of the upper section 131 and the outer surface 144 of the lower section 132 are both curved surfaces that curve in the radial direction of the fastener.

The holder 121 includes a holder upper part 161 and a holder lower part 162, the holder lower part 162 is connected to the tip of the upper segment 131, and the holder upper part 161 is connected to the holder lower part 162. The holder lower part 162 continues to extend upward from the top end of the upper section 131 along the extension tendency of the upper section 131. The outer surface of the holder lower part 162 continuously extends from the outer surface of the upper section 131, so that the outer surface of the holder lower part 162 forms a continuous curved surface from the outer surface of the upper section 131. The upper holder portion 161 extends from the inner surface of the lower holder portion 162 toward the rib 102 for a distance and then extends toward the head 101 beyond the lower holder portion 162, so that a step is formed between the outer surface 165 of the upper holder portion and the upper surface 167 of the lower holder portion. In the axial direction of the fastener, the outer surface 165 of the upper portion of the retaining portion extends in a vertical direction, and the upper surface 167 of the lower portion of the retaining portion extends obliquely downward from the inside to the outside (i.e., in a direction away from the central axis of the fastener) toward a direction away from the head 101.

FIG. 2A isbase:Sub>A cross-sectional view of the fastener of FIG. 1D taken along line A-A, and FIG. 2B isbase:Sub>A cross-sectional view of the fastener of FIG. 1D taken along line B-B.

The distance between one side surface (inner surface) of the pair of holding arms 104 and 105 facing the rib 102 and one side surface (outer surface) thereof facing away from the rib 102 is referred to as the thickness of the holding wall.

As shown in fig. 2A, in an axial cross section of the fastener, the inner surface 141 and the outer surface 143 of the upper section 131 are contoured as straight lines extending obliquely inward from top to bottom. The profiles of the inner and outer surfaces 141, 143 of the upper section 131 are parallel to each other in the same axial cross-section of the fastener.

In an axial cross-section of the fastener, the inner surface 142 of the lower section 132 and the outer surface 144 of the lower section 132 are contoured in an outwardly convex curve. Wherein the inner surface 142 of the lower section 132 is generally downwardly convexly curved in profile. That is, the contour of the interior surface 141 is low in the middle and high on both sides. For the insert portion 122, the inner surface 142 of the lower section 132 of the insert portion 122 curves toward the outer surface 144 of the lower section 132. The profile of the outer surface 144 of the lower section 132 includes a linear portion 208 and an arcuate portion 209, wherein the linear portion is located at the bottom of the lower section 132 and extends generally horizontally. Such that the bottom of the lower section 132 and the bottom of the rib 102 form a continuously extending plane. The arcuate portion 209 is positioned above the linear portion 208 and is connected to the linear portion 208. The arc portion 209 extends from the linear portion 208 toward the upper section 131. The arcuate portion 209 is connected directly to the outer surface of the upper section 131 or is connected to the outer surface of the upper section 131 by a transition portion.

The distance between the inner and outer surfaces of the proximal end of the lower section 132 is greater than the distance between the inner and outer surfaces of the distal end of the lower section 132, i.e., the proximal thickness of the lower section 132 is greater than the thickness of the distal end of the lower section 132, i.e., the thickness of the lower section 132 is thicker near the ribs 102. This strengthens the joint between the holding arm 105 and the rib 102, and makes it less likely to break.

As shown in fig. 2B, in radial cross-section of the fastener, the outer profile of the retaining arms 104 and 105 is arcuate and on the same circumference 201. The center of the circle 201 is located on the central axis 150 of the fastener 100, and the size of the circle 201 matches the size of the mounting hole of the mounting member. The distance between a pair of second side surfaces of the rib 102 is smaller than the diameter of the circumference 201.

FIG. 3 is a perspective view of the fastener of the present application and two components to be joined. As shown in fig. 3, the first member 301 has a mounting hole 311, and the second member 302 has a mounting hole 312. When it is desired to connect two members, the mounting holes 311 of the first member 301 are aligned with the mounting holes 312 of the second member 302, and the fastener 100 is inserted into the two aligned mounting holes 311 and 312 and pushed to install the fastener 100 in place.

Fig. 4A is a cross-sectional view of the fastener of the present application in a pre-installed position, fig. 4B is a cross-sectional view of the fastener of the present application in an installed position, and fig. 4A and 4B illustrate the installation process of the fastener 100.

In the present application, the mounting hole 311 of the first member 301 is larger than the mounting hole 312 of the second member 302. In other embodiments, the mounting holes 311 may be the same size as the mounting holes 312. As shown in fig. 4A, when the fastener 100 is installed in the holes 311 and 312, the pair of holding arms 104 and 105 will come into contact with the edge of the installation hole 312. Application of a downward force to the fastener 100 forces the pair of retaining arms 104 and 105 to deform and flex inwardly so that they can pass through the apertures 312 through the retaining portion lower portion 162. As shown in fig. 4B, the pair of holding arms 104 and 105 are restored to be deformed so that the holding portion lower portion 162 is positioned below the peripheral portion of the mounting hole 312 of the second member 302 and the holding portion upper portion 161 is positioned inside the mounting hole 312. The upper surface of the holding portion lower portion 162 is blocked by the second member 302, so that the fastener 100 cannot move largely in the axial direction with respect to the first member 301 and the second member 302. The outer surface of the holder upper part 161 is blocked by the inner edge of the mounting hole 312 so that the fastener 100 cannot move substantially in the horizontal direction (radial direction) with respect to the first and second members 301 and 302, whereby the fastener 100 is mounted in place in the first and second members 301 and 302. The first member 301 and the second member 302 are stably connected and are not easily detached from each other.

Wherein in one embodiment of the present application, a gap is provided between the upper surface of the lower portion 162 of the retaining portion and the second member 302, which gap is determined by actual usage requirements. In some embodiments, the upper surface 167 of the retainer lower portion 162 may also be in contact with the second member 302.

The upper surface 167 of the retainer section lower portion 162 is sloped downwardly from the inside to the outside to facilitate removal of the fastener 100. When it is desired to extract fastener 100 from first and second members 301 and 302, an upward force is applied to fastener 100 and the slope of upper surface 167 of retainer segment lower portion 162 is able to guide fastener 100 through mounting hole 312 of second member 302.

During installation of the fastener 100, the pair of retaining arms 104 and 105 are deformed to bend toward the rib. The inner surface of the insertion portion of the retaining arm in the present application includes a curved portion, and the inner surface of the lower section 132 has an outwardly convex curved surface, so that in the process of bending the retaining arm, the external force applied to the fastener 100 can be relatively uniformly dispersed to multiple portions of the lower section 132, and the multiple portions of the lower section 132 are deformed, so that the mounting operation of the fastener does not exceed the yield strength of the retaining arms 104 and 105, and the fastener 100 is not easily damaged. If the inner surface of the retaining arm is a continuously extending surface, for example, the inner surface of the lower section 132 and the inner surface of the upper section 131 form a continuous surface, and the inner surfaces of the lower section 132 and the upper section 131 have the same inclination angle with respect to the central axis 150 of the fastener 100, when the fastener 100 is subjected to an external force to deform the retaining arm, the deformation is relatively concentrated at the connection between the retaining arms 104 and 105 and the rib 102, so that the connection is easily broken due to the excessive stress.

FIG. 5 is a cross-sectional view of a second embodiment of the fastener of the present application, similar to the embodiment shown in FIG. 1A, except that the inner surface 542 of the lower section 532 is planar. The angle of inclination of the inner surface of the lower section 532 relative to the central axis of the fastener 100 is greater than the angle of inclination of the inner surface of the upper section 531 relative to the central axis of the fastener 100 so that the junction of the inner surface of the upper section 531 and the inner surface of the lower section 532 bulges outwardly. That is, the junction of the inner surface of the upper section 531 and the inner surface of the lower section 532 is curved toward the outer surface of the insertion portion. The embodiment shown in fig. 5 also disperses the deformation of the retaining arms 104 and 105 when the fastener 100 is subjected to an external force, making the retaining arms of the fastener 100 less susceptible to damage. For example, a portion of the deformation is dispersed to the junction of the upper and lower segments 531, 532. The embodiment shown in fig. 5 is also capable of implementing the technical effects of the embodiment shown in fig. 1A to some extent.

In this application, the shape setting of the inboard surface of hypomere makes the retaining arm be difficult for receiving the damage, can improve the life of fastener.

The fastener of the present application is capable of accommodating smaller sizes, for example, head diameters between 3mm and 30mm and fastener heights between 8mm and 30 mm. In some embodiments of the present application, the head has a diameter of between 8mm and 12mm and the fastener has a height of between 3mm and 5mm. In one embodiment of the present application, the head has a diameter of about 10mm and the fastener has a height of about 4mm.

While only certain features of the application have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the application.

Claims (10)

1. A fastener, characterized by comprising:

a head having a lower surface;

a rib extending from a lower surface of the head in an axial direction of the fastener, an end of the rib remote from the head being a distal end;

a pair of retaining arms extending from a distal end of the rib toward the head and away from each other;

wherein each of the pair of retaining arms includes a retaining portion and an insertion portion, the retaining portion being closer to the head portion than the insertion portion, an inner surface of the insertion portion including a portion that curves toward an outer surface of the insertion portion.

2. The fastener of claim 1, wherein:

the insertion portion includes an upper section connected to the rib portion and a lower section located between the lower section and the holding portion, and an inner surface of the lower section is a curved surface curved toward an outer surface of the lower section.

3. The fastener of claim 2, wherein:

the profile of the inner surface of the upper section is linear in axial cross-section of the fastener.

4. The fastener of claim 2, wherein:

the thickness of the proximal end of the lower section is greater than the thickness of the distal end of the lower section.

5. The fastener of claim 2, wherein:

in an axial cross-section of the fastener, the inner surface of the lower section includes an arcuate segment that is convex in a direction away from the head, and the outer surface of the lower section is contoured to include an arcuate segment.

6. The fastener of claim 1, wherein:

the insertion portion includes an upper section connected to the rib portion and a lower section located between the lower section and the holding portion, and an inclination angle of an inner surface of the lower section with respect to a central axis of the fastener is larger than an inclination angle of an inner surface of the upper section with respect to the central axis of the fastener.

7. The fastener of claim 1, wherein:

the holding part comprises a holding part upper part and a holding part lower part, the holding part lower part is connected with the top end of the insertion part, the holding part upper part is connected with the holding part lower part, extends from the inner side of the holding part lower part to the rib part for a certain distance, and then extends to the head part and exceeds the holding part lower part; so that a step is formed between an outer surface of an upper portion of the holding part and an upper surface of a lower portion of the holding part;

the upper surface of the lower portion of the holding portion extends obliquely from the inside to the outside in a direction away from the head portion.

8. The fastener of claim 1, wherein:

in an axial cross section of the fastener, the respective outer profiles of the pair of retaining arms are on the same circumference.

9. The fastener of claim 1, wherein:

the rib has a pair of first sides, the pair of retaining arms being connected to the bottoms of the pair of first sides, respectively, the pair of first sides extending parallel to each other at the distal end of the rib.

10. The fastener of claim 1, wherein:

the height range of the fastener is 3mm-5mm.

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