CN116892553A - Fastening piece - Google Patents

Abstract

The application relates to a fastener which is used for being inserted into a first through hole formed in a first plate and is rectangular, and the fastener comprises a head part, a main body, at least two elastic arms and at least two anti-rotation parts. The body is disposed below the head. At least two resilient arms are disposed on opposite first and second sides of the body, respectively, and connect the first and second sides of the body with the head, respectively. At least two anti-rotation portions protrude from the first side and the second side of the main body, respectively. Wherein the at least two anti-rotation portions are configured to be positioned in the first through hole when the fastener is inserted into the first plate for installation in place, each of the at least two anti-rotation portions engaging adjacent two edges of the first through hole to hinder rotation of the fastener relative to the first plate. The fastener of the application can prevent the fastener from rotating relative to the first plate during installation and can better clamp the first plate.

Description

Fastening piece

Technical Field

The present application relates to fasteners.

Background

When the first and second plates are connected, the operator snaps the fastener into the first plate, then places the second plate over the fastener, and screws into the connector (e.g., a screw). However, the fastener does not fit well with the first plate, and particularly when the connector is screwed in, the fastener may rotate relative to the first plate, causing problems such as slippage.

Disclosure of Invention

The application provides a fastener which is used for being inserted into a first through hole formed in a first plate and is rectangular, and the fastener comprises a head part, a main body, at least two elastic arms and at least two anti-rotation parts. The body is disposed below the head. The at least two resilient arms are disposed on opposite first and second sides of the body, respectively, and connect the first and second sides of the body with the head, respectively. The at least two anti-rotation portions protrude from the first side and the second side of the main body, respectively. Wherein the at least two anti-rotation portions are configured to be positioned in the first through hole when the fastener is installed in place in the first plate, each of the at least two anti-rotation portions engaging with adjacent two edges of the first through hole to hinder rotation of the fastener relative to the first plate.

According to the fastener, the body further includes third and fourth oppositely disposed sides. The third side, the first side of the first rotation preventing portion and the first side of the second rotation preventing portion are arranged to be located on the same plane and matched with one edge of the first through hole.

According to the fastener, the first rotation preventing portion further comprises a first rotation preventing portion second side face, and the second rotation preventing portion further comprises a second rotation preventing portion second side face. The first and second anti-rotation portions are configured such that when the fastener is installed in place in the first plate, the first anti-rotation portion first side engages with the first anti-rotation portion second side with two adjacent edges of one corner of the first through hole, and the second anti-rotation portion second side engages with two adjacent edges of the second anti-rotation portion first side with another corner of the first through hole. The distance between the first rotation preventing portion second side surface and the second rotation preventing portion second side surface is not smaller than the distance between the third side and the fourth side.

According to the fastener, the proximal ends of the at least two resilient arms are connected to the first and second sides of the body, respectively, and the distal ends of the at least two resilient arms are connected to the head. The at least two anti-rotation portions are located outside the distal ends of the resilient arms on the respective sides.

According to the fastener, the head is provided with a hollow part penetrating through the head. The body is movable relative to the head to gain access to the hollow.

According to the fastener described above, the main body has a pre-installation position and an installation position, and is movable between the pre-installation position and the installation position by movement. The fastener is configured to: the top surface of the body is a predetermined distance from the top surface of the head when the body is in the pre-installed position, and the top surface of the body is flush with the top surface of the head and is capable of abutting together against a second plate when the body is in the installed position.

According to the fastener, the main body is provided with the connecting hole, the connecting hole is formed by downwards sinking from the upper surface of the main body, and the inner surface of the connecting hole is provided with the internal thread for being matched with the external thread on the connecting piece.

According to the fastener described above, the at least two resilient arms are configured to: the cooperation of the external thread and the internal thread drives the main body to move from the pre-installation position to the installation position so as to enter the hollow part.

According to the fastener, a clamping portion is provided on each of the at least two elastic arms. The at least two resilient arms are configured to: the at least two resilient arms deform when the body moves from the pre-installation position to the installation position, the clamping portion clamping the first plate with the head.

According to the fastener, the clamping portion includes a plurality of stepped portions provided on an outer surface of the elastic arm.

The application also provides a fastener for insertion into a rectangular first through hole in a first plate, the fastener comprising a head, a body, two resilient arms and four anti-rotation portions. The body is disposed below the head. The two resilient arms are disposed on opposite first and second sides of the body, respectively, and connect the first and second sides of the body with the head, respectively. Two of the four anti-rotation portions protrude from a first side of the main body, and the other two of the four anti-rotation portions protrude from a second side of the main body. Wherein the four anti-rotation portions are configured to be positioned in the first through hole when the fastener is installed in place in the first plate, each of the four anti-rotation portions engaging with adjacent two edges of the first through hole to hinder rotation of the fastener relative to the first plate.

The fastener of the application can prevent the fastener from rotating relative to the first plate during installation and can better clamp the first plate.

The conception, specific structure, and technical effects of the present application will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present application.

Drawings

The application will become more readily understood when the following detailed description is read in conjunction with the accompanying drawings, wherein like reference numerals designate like parts throughout the views, and in which:

FIGS. 1A-1C are perspective views of the fastener of the present application from different directions;

FIG. 1D is a cross-sectional view of the fastener shown in FIG. 1A, with the body of the fastener in a pre-installed position;

FIG. 1E is a cross-sectional view of the fastener shown in FIG. 1A, with the body of the fastener in an installed position;

FIG. 2 is an exploded view of the fastener, first plate and second plate of the present application;

fig. 3A-3D are views of the fastener installation process.

Detailed Description

Various embodiments of the present application are described below with reference to the accompanying drawings, which form a part hereof. It is to be understood that, although directional terms, such as "upper", "lower", "left", "right", "front", "rear", etc., may be used in the present application to describe various example structural parts and elements of the present application, these terms are used herein for convenience of description only and are determined based on the exemplary orientations shown in the drawings. Since the disclosed embodiments of the application may be arranged in a variety of orientations, these directional terms are used by way of illustration only and are in no way limiting.

It will be understood that ordinal numbers such as "first" and "second" used in the present application are used for distinguishing and identifying only, and do not have any other meaning, and do not denote a particular order, nor have particular relevance, unless otherwise indicated. For example, the term "first resilient arm" does not itself imply the presence of "second resilient arm" nor does the term "second resilient arm" itself imply the presence of "first resilient arm".

Fig. 1A-1B are perspective views of the fastener of the present application from different directions. Fig. 1A is a perspective view of the fastener of the present application from the front, and fig. 1B is a perspective view of the fastener shown in fig. 1A from the rear. The fastener of the present application is capable of mating with the connector 302 (see fig. 3D) to connect the first plate 202 (see fig. 2) and the second plate 222 (see fig. 2). The first plate 202 is provided with a rectangular first through hole 204.

As shown in fig. 1A-1B, the fastener includes a body 102, a head 104, a first resilient arm 106, a second resilient arm 108, and four anti-rotation portions. In one embodiment of the application, the body 102, the head 104, the first resilient arm 106, the second resilient arm 108, and the four anti-rotation portions are integrally formed. Wherein the head 104 is generally rectangular plate-like. The main body 102 is substantially square, and is formed to extend in the up-down direction. The body 102 is disposed below the head 104. The body 102 has oppositely disposed first (i.e., left) and second (i.e., right) sides 126, 128, and oppositely disposed third (i.e., front) and fourth (i.e., rear) sides 122, 124. The first side 126, the third side 122, the second side 128, and the fourth side 124, in turn, surround four sides of the body 102. The four rotation preventing parts are a first rotation preventing part 141, a second rotation preventing part 142, a third rotation preventing part 143, and a fourth rotation preventing part 144, respectively. The four rotation prevention units are provided at four corners of the main body 102, respectively, and are provided at substantially an upper portion of the main body 102. The first and second resilient arms 106, 108 are disposed on the first and second sides 126, 128 and connect the first and second sides 126, 128 of the body 102 with the head 104, respectively. The head 104 is sized larger than the first through hole 204 on the first plate 202 (see fig. 2), and the head 104, the first resilient arm 106, the second resilient arm 108, and the four anti-rotation portions are sized to match the size of the first through hole 204 so that when a fastener is inserted into the first through hole 204 of the first plate 202 and installed in place, the head 104, the first resilient arm 106, the second resilient arm 108, and the four anti-rotation portions can pass through the first through hole 204 and be positioned in the first through hole 204, and the head 104 can remain above the first through hole 204 to block the fastener from moving downward out of the first through hole 204. When the fastener is inserted into the first through hole 204 of the first plate 202 and mounted in place, the four anti-rotation portions are located in the first through hole 204 and at the four corners of the first through hole 204, respectively, to mate with the four corners of the first through hole 204. More specifically, each of the four anti-rotation portions cooperates with adjacent two edges of the first through hole 204 to resist rotation of the fastener relative to the first plate 202.

Specifically, the first and fourth anti-rotation portions 141 and 144 protrude from the first side 126 of the body 102, and the second and third anti-rotation portions 142 and 143 protrude from the second side 128 of the body 102. The first rotation preventing part 141 includes a first rotation preventing part first side 151 and a first rotation preventing part second side 152. The first anti-rotation portion first side 151 and the first anti-rotation portion second side 152 are disposed at substantially right angles. The second anti-rotation portion 142 includes a second anti-rotation portion first side 153 and a second anti-rotation portion second side 154. The second anti-rotation portion first side 153 and the second anti-rotation portion second side 154 are disposed at substantially right angles. The first rotation preventing portion first side 151 and the second rotation preventing portion first side 153 are disposed toward the front, and are disposed to be in the same plane as the third side 122 of the main body 102 and are engaged with one edge (e.g., a front edge) of the first through hole 204. The third rotation preventing portion 143 includes a third rotation preventing portion first side 155 and a third rotation preventing portion second side 156. The third anti-rotation portion first side 155 and the third anti-rotation portion second side 156 are disposed at substantially right angles. The fourth anti-rotation portion 144 includes a fourth anti-rotation portion first side 157 and a fourth anti-rotation portion second side 158. The fourth anti-rotation portion first side 157 and the fourth anti-rotation portion second side 158 are disposed at substantially right angles. The third anti-rotation portion first side 155 and the fourth anti-rotation portion first side 157 are disposed toward the rear and are disposed to lie in the same plane as the fourth side 124 of the main body and are mated with one edge (e.g., a rear edge) of the first through hole 204. Further, the first rotation preventing portion second side 152 and the fourth rotation preventing portion second side 158 are disposed toward the left, are disposed to be on the same plane, and are engaged with one edge (e.g., left edge) of the first through hole 204. The second rotation preventing portion second side 154 and the third rotation preventing portion second side 156 are disposed toward the right, are disposed to be on the same plane, and are engaged with one edge (e.g., right edge) of the first through hole 204. Wherein, the distance between the first rotation preventing portion second side surface 152 and the second rotation preventing portion second side surface 154 is a first distance L1. The distance between the third side 122 and the fourth side 124 is a second distance L2 (see fig. 1C). The first distance L1 is not smaller than the second distance L2.

Fig. 1C is a perspective view of the fastener shown in fig. 1A from the right. As shown in fig. 1A-1C, the proximal ends (i.e., lower ends) of the first and second spring arms 106, 108 are connected to the first and second sides 126, 128, respectively, of the body 102, and the distal ends (i.e., upper ends) of the first and second spring arms 106, 108 are connected to the head 104, respectively. The first rotation preventing portion 141 and the fourth rotation preventing portion 144 are located outside the distal ends of the first elastic arms 106, respectively, and the second rotation preventing portion 142 and the third rotation preventing portion 143 are located outside the distal ends of the second elastic arms 108, respectively. Since the first distance L1 is not smaller than the second distance L2, the first elastic arm 106 and the second elastic arm 108 are provided on the shorter sides of the main body 102.

Further, a clamping portion is provided on each of the first and second resilient arms 106, 108 for clamping the first plate 202 together with the head 104. Specifically, the clamping portion includes a plurality of stepped portions 162 disposed on the outer surfaces of the first and second resilient arms 106, 108. In other words, the plurality of step portions 162 form a zigzag shape.

The body 102 of the fastener of the present application is movable relative to the head 104 and has a pre-installed position and an installed position. The body 102 is movable between a pre-installation position and an installation position by movement.

FIG. 1D is a cross-sectional view of the fastener shown in FIG. 1A, with the body 102 in a pre-installed position; FIG. 1E is a cross-sectional view of the fastener shown in FIG. 1A, with the body 102 in an installed position. As shown in fig. 1D-1E, the head 104 is provided with a hollow 112 extending through the head 104. The body 102 is movable relative to the head 104 to enter and exit the hollow 112. Wherein the first and second resilient arms 106, 108 are configured to deform (i.e., deform) to allow the body 102 to move relative to the head 104.

Specifically, the main body 102 is provided with a connection hole 114. The connection hole 114 penetrates the main body 102 in the up-down direction. The inner surface of the connection hole 114 is provided with an internal thread (not shown) for mating with an external thread (not shown) of the connection member 302 (see fig. 3D). When the connector 302 extends into the connection hole 114 and rotates relative to the body 102, the rotation of the connector 302 will drive the body 102 to move upward relative to the head 104 into the hollow 112 due to the engagement of the external threads of the connector 302 with the internal threads of the connection hole 114. As shown in fig. 1D, the body 102 is in a pre-installed position. The top surface of the body 102 is now a predetermined distance from the top surface of the head 104. As shown in fig. 1E, the body 102 is in the installed position. At this point the body 102 enters the hollow 112 and the top surface of the body 102 is flush with the top surface of the head 104. Further, during the movement of the main body 102 from the pre-installation position to the installation position, the middle portions of the first and second elastic arms 106 and 108 are respectively away from the main body 102, so that the plurality of stepped portions 162 are brought close to the head 104 in the up-down direction.

Fig. 2 is an exploded view of the fastener, first plate 202 and second plate 222 of the present application. As shown in fig. 2, the first plate 202 is substantially a flat plate. The first plate 202 is provided with a rectangular first through hole 204. The first through hole 204 has a first edge 211, a second edge 212, a third edge 213, and a fourth edge 214, which are respectively directed to the front, the rear, the left, and the right. The first edge 211, the fourth edge 214, the second edge 212, and the third edge 213 are sequentially enclosed, and four corners are formed at adjacent positions. Four of the anti-rotation portions of the fastener are capable of engaging four corners of the first through hole 204, thereby preventing the fastener from rotating relative to the first plate 202. The second plate 222 is a generally flat plate. The second plate 222 is provided with a second through hole 232 of a substantially circular shape for receiving the connection member 302 (see fig. 3D).

Fig. 3A-3D are views of the fastener installation process. Fig. 3A-3C, among others, illustrate the installation of the fastener with the first plate 202. Fig. 3A is a first cross-sectional view of the fastener and the first plate 202 to illustrate the positional relationship of the first and second resilient arms 106, 108 and the first through hole 204; fig. 3B is a second cross-sectional view of the fastener and the first plate 202 to show the positional relationship of the first and second rotation preventing parts 141 and 142 with the first through hole 204; fig. 3C is a third cross-sectional view of the fastener and the first plate 202 to show the positional relationship of the second rotation preventing portion 142 and the third rotation preventing portion 143 with the first through hole 204. As shown in fig. 3A-3C, the body 102, the first resilient arm 106, the second resilient arm 108, and the four anti-rotation portions of the fastener are located in the first through hole 204, with the body 102 in a pre-installed position. The first anti-rotation portion first side 151, the third side 122, and the second anti-rotation portion first side 153 are in the same plane and cooperate with the first edge 211 in common, and the third anti-rotation portion first side 155, the fourth side 124, and the fourth anti-rotation portion first side 157 are in the same plane and cooperate with the second edge 212 in common, such that the oppositely disposed first edge 211 and second edge 212 of the first through hole 204 are abutted by the fastener throughout the length. The first anti-rotation second side 152 and the fourth anti-rotation second side 158 are in the same plane and cooperate with a third edge 213, and the second anti-rotation second side 154 and the third anti-rotation second side 156 are in the same plane and cooperate with a fourth edge 214, such that the two ends of the third edge 213 and the fourth edge 214 are abutted by the fastener throughout the length of the oppositely disposed third edge 213 and fourth edge 214 of the first through hole 204. Thus, four anti-rotation portions are located at four corners of the first through hole 204, respectively, and each anti-rotation portion cooperates with two adjacent edges of the first through hole 204 to block rotation of the fastener relative to the first plate 202.

Fig. 3D shows the installation state of the fastener with the first plate 202, the connector 302, and the second plate 222 to show the positional relationship of the first and second elastic arms 106 and 108 with the first through hole 204. As shown in fig. 3D, the body 102 is in the installed position. The top surface of the body 102 abuts the top surface of the head 104 against the second plate 222. The distal ends (i.e., upper ends) of the first and second spring arms 106, 108 can abut against the third and fourth edges 213, 214, respectively, of the first through-hole 204. The bottom surface of the head 104 abuts the upper surface of the first plate 202 and one of the plurality of steps 162 abuts the lower surface of the first plate 202 such that the head 104 and the steps 162 grip the first plate 202 to prevent the first plate 202 from backing out of the fastener.

The installation process of the fastener and connector 302 to install the first plate 202 and the second plate 222 together is described below in connection with fig. 3A-3D:

first, as shown in fig. 3A-3C, the operator inserts the fastener into the first through hole 204 of the first plate 202 and brings the bottom surface of the head 104 into abutment with the upper surface of the first plate 202. The operator then places the second plate 222 over the head 104 with the second through hole 232 generally aligned with the connection hole 114 in the body 102. The operator then screws the connector 302 down into the second through hole 232 and the connection hole 114. The mating of the external threads of the connector 302 with the internal threads in the connector bore 114 will, on the one hand, move the body 102 upwardly relative to the head 104 such that the top surface of the body 102 abuts the lower surface of the second plate 222, and on the other hand, will move the middle portions of the first and second resilient arms 106, 108 outwardly away from the body 102 such that one of the stepped portions 162 abuts the lower surface of the first plate 202. Thus, the head 104 and the step 162 clamp the first plate 202 and the fastener and connector 302 clamp the second plate 222, thereby connecting the first plate 202 and the second plate 222 together.

It should be noted that, although the first rotation preventing portion first side 151, the third side 122, and the second rotation preventing portion first side 153 are shown to be on the same plane and the third rotation preventing portion first side 155, the fourth side 124, and the fourth rotation preventing portion first side 157 are shown to be on the same plane in the embodiment of the present application, in other embodiments, the first rotation preventing portion first side 151 and the second rotation preventing portion first side 153 are shown to be on the same plane and the third rotation preventing portion first side 155 and the fourth rotation preventing portion first side 157 are shown to be on the same plane.

It should be further noted that, although four anti-rotation portions are shown in the embodiment of the present application, the fastener including at least two anti-rotation portions is within the scope of the present application.

The fastener of the present application prevents rotation of the fastener relative to the first plate 202 during installation. Specifically, the fastener of the present application is configured to mate with adjacent two edges in the first through hole 204 by providing an anti-rotation feature. At least two corners of the first through hole 204 are blocked by the anti-rotation portion of the fastener, thereby preventing the fastener from rotating relative to the first plate 202. Furthermore, the fastener of the present application can also better grip the first plate 202. Specifically, the body 102 of the present application is capable of moving relative to the head 104 and accessing the hollow 112 on the head 104. The body 102 has a greater distance of movement in the up-down direction, which causes greater deformation of the first and second resilient arms 106, 108, thereby causing greater force of the deformed first and second resilient arms 106, 108 against the lower surface of the first plate 202 to hold the first plate 202 in place. Further, because the first and second resilient arms 106, 108 are capable of greater deformation, the fastener of the present application also maintains the first plate 202 in place when the thickness of the first plate 202 is thin, preventing it from backing out from under the fastener.

It should be noted that, although two elastic arms are shown in the embodiment of the present application, a fastener including at least two elastic arms is within the scope of the present application.

It should be noted that, although the embodiment of the present application shows that the connection hole 114 is provided through the main body 102, in other embodiments, the connection hole 114 may be formed to be recessed from the upper surface of the main body 102.

It should be noted that, although the embodiment of the present application has been described with reference to the plurality of stepped portions 162, it is understood by those skilled in the art that the clamping portion configured to abut against the first plate 202 from below is also within the scope of the present application.

While the present disclosure has been described in conjunction with the examples of embodiments outlined above, various alternatives, modifications, variations, improvements, and/or substantial equivalents, whether known or that are or may be presently or later be envisioned, may be apparent to those of ordinary skill in the art. Further, the technical effects and/or technical problems described in the present specification are exemplary rather than limiting; the disclosure in this specification may be used to solve other technical problems and to have other technical effects and/or may solve other technical problems. Accordingly, the examples of embodiments of the disclosure as set forth above are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit or scope of the disclosure. Accordingly, the present disclosure is intended to embrace all known or earlier developed alternatives, modifications, variations, improvements and/or substantial equivalents.

Claims (12)

1. A fastener for insertion into a first through-hole (204) of a first plate (202) having a rectangular shape, the fastener comprising:

a head (104);

-a body (102), the body (102) being arranged below the head (104);

-at least two elastic arms provided on opposite first (126) and second (128) sides of the body (102), respectively, and connecting the first (126) and second (128) sides of the body (102) with the head (104), respectively; and

at least two anti-rotation portions protruding from a first side (126) and a second side (128) of the body (102), respectively;

wherein the at least two anti-rotation portions are configured to be located in the first through hole (204) when the fastener is inserted into the first plate (202) for installation in place, each of the at least two anti-rotation portions cooperating with adjacent two edges of the first through hole (204) to hinder rotation of the fastener relative to the first plate (202).

2. The fastener according to claim 1, wherein:

the at least two anti-rotation parts comprise a first anti-rotation part (141) and a second anti-rotation part (142), the first anti-rotation part (141) comprises a first anti-rotation part first side surface (151), and the second anti-rotation part (142) comprises a second anti-rotation part first side surface (153);

wherein the first rotation preventing part first side surface (151) and the second rotation preventing part first side surface (153) are arranged to be located on the same plane and matched with one edge of the first through hole (204).

3. The fastener according to claim 2, wherein:

the body (102) further includes oppositely disposed third (122) and fourth (124) sides;

the third side (122), the first anti-rotation portion first side (151) and the second anti-rotation portion first side (153) are arranged to be located on the same plane and are matched with one edge of the first through hole (204).

4. A fastener according to claim 3, wherein:

the first rotation preventing part (141) further comprises a first rotation preventing part second side surface (152), and the second rotation preventing part (142) further comprises a second rotation preventing part second side surface (154);

the first anti-rotation portion (141) and the second anti-rotation portion (142) are configured such that when the fastener is inserted into the first plate (202) and installed in place, the first anti-rotation portion first side (151) mates with two adjacent edges of one corner of the first through hole (204) and the first anti-rotation portion second side (152) mates with two adjacent edges of the other corner of the first through hole (204), and the second anti-rotation portion second side (154) mates with the second anti-rotation portion first side (153) mates with two adjacent edges of the other corner of the first through hole (204);

the distance between the first anti-rotation portion second side surface (152) and the second anti-rotation portion second side surface (154) is not smaller than the distance between the third side (122) and the fourth side (124).

5. The fastener according to claim 1, wherein:

proximal ends of the at least two resilient arms are connected to a first side (126) and a second side (128) of the body (102), respectively, distal ends of the at least two resilient arms being connected to the head (104);

the at least two anti-rotation portions are located outside the distal ends of the resilient arms on the respective sides.

6. The fastener according to claim 1, wherein:

the head (104) is provided with a hollow part (112) penetrating through the head (104);

the body (102) is movable relative to the head (104) to gain access to the hollow (112).

7. The fastener as claimed in claim 6, wherein:

the body (102) having a pre-installation position and an installation position and being movable between the pre-installation position and the installation position by movement;

the fastener is configured to: the top surface of the body (102) is a predetermined distance from the top surface of the head (104) when the body (102) is in the pre-mounted position, and the top surface of the body (102) is flush with the top surface of the head (104) and is capable of abutting together against a second plate (204) when the body (102) is in the mounted position.

8. The fastener as claimed in claim 7, wherein:

the connecting device is characterized in that a connecting hole (114) is formed in the main body (102), the connecting hole (114) is formed by downwards sinking from the upper surface of the main body (102), and an inner thread is arranged on the inner surface of the connecting hole (114) and is used for being matched with an outer thread on the connecting piece (302).

9. The fastener as claimed in claim 8, wherein:

the at least two resilient arms are configured to: the cooperation of the external threads and the internal threads drives the body (102) to move from the pre-installation position to the installation position, thereby entering the hollow (112).

10. The fastener as claimed in claim 7, wherein:

a clamping part is arranged on each of the at least two elastic arms;

the at least two resilient arms are configured to: the at least two resilient arms deform when the body (102) moves from the pre-mounted position to the mounted position, the clamping portion clamping the first plate (202) with the head (104).

11. The fastener as claimed in claim 10, wherein:

the clamping portion includes a plurality of stepped portions (162) disposed on an outer surface of the resilient arm.

12. A fastener for insertion into a first through-hole (204) of a first plate (202) having a rectangular shape, the fastener comprising:

a head (104);

-a body (102), the body (102) being arranged below the head (104);

-two elastic arms provided on opposite first (126) and second (128) sides of the body (102), respectively, and connecting the first (126) and second (128) sides of the body (102) with the head (104), respectively; and

four anti-rotation portions, two of which protrude from a first side (126) of the body (102), and two of which protrude from a second side (128) of the body (102);

wherein the four anti-rotation portions are configured to be located in the first through hole (204) when the fastener is installed in place in the first plate (202), each of the four anti-rotation portions cooperating with adjacent two edges of the first through hole (204) to hinder rotation of the fastener relative to the first plate (202).