TWI852129B - Electrical connector - Google Patents

Abstract

An electrical connector can be matched with a docking member and has a pressing cantilever, a pressing side elastic arm, a non-pressing side elastic arm and a buckle structure. The pressing cantilever can be displaced by the action of the pressing force, and the pressing cantilever is connected to the pressing side elastic arm and the non-pressing side elastic arm, so that when the pressing cantilever is displaced by the pressing force, the pressing cantilever can cause elastic deformation of the pressing side elastic arm and the non-pressing side elastic arm, so that the pressing side elastic arm and the non-pressing side elastic arm can respectively provide elastic restoring force to the pressing cantilever, and force the pressing cantilever to return to the position before being displaced by the action of the pressing force. In this way, the actuating structure of the pressing cantilever can be prevented from being deformed due to excessive force and deformation, thereby increasing the service life of the electrical connector.

Description

Electrical connector

The present invention relates to an electrical connector, more specifically, an electrical connector that can prevent components from yielding and deforming due to excessive stress deformation.

According to the standard, electrical connectors are usually indispensable for electronic products. Generally speaking, electrical connectors are used to plug into mating components to achieve electrical connection and transmit electrical signals. Since the plug-in relationship between the electrical connector and the mating component is easily released by external impact, the electrical connection between the electrical connector and the mating component is easily damaged, thereby affecting the normal operation of the electronic product and even causing damage to the electronic product.

Therefore, the electrical connector is usually provided with a snap-on structure and an actuating structure. The electrical connector can snap-on the mating component by the snap-on structure to maintain the plug-in relationship between the electrical connector and the mating component, and the actuating structure can receive external force to actuate the snap-on structure to release the snap-on relationship between the snap-on structure and the mating component. However, when receiving external force, the actuating structure is often damaged due to excessive deformation, so that the electrical connector cannot be plugged into the mating component as expected.

Based on the above, how to prevent the actuating structure of the electrical connector from being damaged due to excessive deformation, and thus improve the service life of the electrical connector, has become an issue of urgent concern to people in the relevant technical field.

In view of the above-mentioned shortcomings of the prior art, the present invention provides an electrical connector, which is matched with a pair of connecting components. The electrical connector includes: an insulating rubber core, the insulating rubber core has a rubber core body, a push-down cantilever, a push-down side spring arm, a non-press-down side spring arm and a buckle structure; wherein the push-down cantilever has a push-down cantilever hanging end and a push-down cantilever joint. The pressing side elastic arm has a pressing side elastic arm connecting end and a pressing side elastic arm connecting end, the pressing side elastic arm connecting end is connected to the rubber core body, and the pressing side elastic arm connecting end is engaged with the buckle structure; the non-pressing side elastic arm has a non-pressing side elastic arm The spring arm connecting end is connected to a non-pressing side spring arm engaging end, the non-pressing side spring arm connecting end is connected to the rubber core body, and the non-pressing side spring arm engaging end is engaged with the buckle structure; when the cantilever end of the press cantilever is displaced by the press pressure, the press cantilever engaging end actuates the buckle structure, so that the buckle structure can be changed from a non-actuated state to an actuated state; and when the buckle structure is When the structure is in the actuated state, the buckling structure is movable to buckle the abutting component, and causes the pressing side elastic arm and the non-pressing side elastic arm to elastically deform, so that the pressing side elastic arm and the non-pressing side elastic arm can provide elastic restoring force to the buckling structure, and force the buckling structure to change from the actuated state to the non-actuated state, so as to maintain the buckling of the buckling structure to the abutting component.

Preferably, in the electrical connector of the present application, the engagement end of the push-side elastic arm also engages with the engagement end of the push-side cantilever arm, so that when the cantilever end of the push-side cantilever arm is displaced by the push pressure, the engagement end of the push-side cantilever arm can also cause the push-side elastic arm to elastically deform, so that the push-side elastic arm can provide an elastic restoring force to the push-side cantilever arm, thereby forcing the cantilever end of the push-side cantilever arm to return to the position before being displaced by the push pressure.

Preferably, in the electrical connector of the present application, the non-pressing side spring arm engagement end also engages the pressing cantilever arm engagement end, so that when the pressing cantilever arm suspension end is displaced by the pressing force, the pressing cantilever arm engagement end can also cause the non-pressing side spring arm to elastically deform, so that the non-pressing side spring arm can provide an elastic restoring force to the pressing cantilever arm, thereby forcing the pressing cantilever arm suspension end to return to the position before being displaced by the pressing force.

Preferably, in the electrical connector of the present application, the pressing cantilever and the non-pressing side elastic arm form an elastic cantilever structure, the pressing cantilever free end and the non-pressing side elastic arm connecting end are respectively located at the head and tail ends of the elastic cantilever structure, and the buckle structure is located at the belly of the elastic cantilever structure.

Preferably, in the electrical connector of the present application, the pressing side elastic arm and the non-pressing side elastic arm form an elastic ring structure, and the pressing cantilever arm engagement end also engages the belly position of the elastic ring structure, so that when the hanging end of the pressing cantilever arm is displaced by the pressing force, the pressing cantilever arm engagement end can also cause the elastic ring structure to deform elastically, so that the elastic ring structure can provide an elastic restoring force to the pressing cantilever arm, thereby forcing the hanging end of the pressing cantilever arm to return to the position before being displaced by the pressing force.

Preferably, in the electrical connector of the present application, the rubber core body is recessed with a displacement space, and the displacement space is provided for the cantilever end of the push cantilever to shift therein, and the push side spring arm extends below the push cantilever to avoid the displacement space.

Preferably, in the electrical connector of the present application, the push-side spring arm connection end avoids the push-side spring arm suspension end to prevent the push-side spring arm connection end from interfering with the displacement of the push-side spring arm suspension end.

Preferably, in the electrical connector of the present application, the pressing side spring arm and the non-pressing side spring arm have a U-shaped elastic structure, which can provide longitudinal and lateral elastic restoring force to the buckle structure.

Preferably, in the electrical connector of the present application, the rubber core body has a pressing side and a non-pressing side opposite to each other, the pressing cantilever arm cantilever end is displaced by the pressing force on the pressing side, the pressing side spring arm connecting end is connected to the rubber core body on the pressing side, and the non-pressing side spring arm connecting end is connected to the rubber core body on the non-pressing side.

Preferably, in the electrical connector of the present application, the pressing side spring arm connection end is connected to the rubber core body at a pressing side connection position, and the non-pressing side spring arm connection end is connected to the rubber core body at a non-pressing side connection position, and the pressing side connection position and the non-pressing side connection position have different heights.

Preferably, in the electrical connector of the present application, the pressing side spring arm engagement end is engaged with the buckle structure at a pressing side engagement position, and the non-pressing side spring arm connection end is engaged with the buckle structure at a non-pressing side engagement position, and the pressing side engagement position and the non-pressing side engagement position have different heights.

Compared with the prior art, the electrical connector provided by the present application is equipped with a docking structure and has a pressing cantilever, a pressing side spring arm, a non-pressing side spring arm and a buckle structure. The pressing cantilever can be displaced by the pressing force, and the pressing cantilever is connected to the pressing side elastic arm and the non-pressing side elastic arm, so that when the pressing cantilever is displaced by the pressing force, the pressing cantilever can cause the pressing side elastic arm and the non-pressing side elastic arm to elastically deform, so that the pressing side elastic arm and the non-pressing side elastic arm can respectively provide elastic restoring force to the pressing cantilever, and force the pressing cantilever to return to the position before being displaced by the pressing force. In this way, the actuating structure of the pressing cantilever can be prevented from being deformed by excessive force and yielding, thereby improving the service life of the electrical connector.

1:Electrical connector

11: Insulation rubber core

111: Rubber core body

112: Press the cantilever

1121: Press the cantilever arm to the empty end

1122: Press the cantilever joint end

113: Press the side arm

1131: Press the side arm connection end

1132: Press the side spring arm joint end

114: Non-pressing side arm

1141: Non-press side spring arm connection end

1142: Non-pressing side spring arm joint end

115: Buckle structure

2: Docking components

A: Elastic cantilever structure

B: Elastic ring structure

S: Shift space

L1: Press side

L2: Non-pressing side

P11: Press side connection position

P12: Non-pressing side connection position

P21: Press side engagement position

P22: Non-pressing side engagement position

The above and other aspects, features and other advantages of this application will be more clearly understood through the following description of embodiments in conjunction with the drawings.

Figure 1 is a schematic diagram of the use of the electrical connector of this application in combination with the docking components.

Figure 2 is a schematic diagram of the use of the electrical connector of this application in combination with the docking components.

Figure 3 is a three-dimensional schematic diagram of an embodiment of the electrical connector of this application.

Figure 4 is a top view schematic diagram of an embodiment of the electrical connector of this application.

Figure 5 is a bottom view of an embodiment of the electrical connector of the present application.

Figure 6 is a rear view schematic diagram of an embodiment of the electrical connector of the present application.

Figure 7 is a side view schematic diagram of an embodiment of the electrical connector of the present application.

FIG8 is a schematic cross-sectional view of some components of the electrical connector shown in FIG7 cut along line segment AA.

Figure 9 is a front view schematic diagram of an embodiment of the electrical connector of the present application.

FIG10 is a schematic cross-sectional view of some components of the electrical connector shown in FIG9 cut along line segment BB.

Figure 11 is a schematic cross-sectional view of some components of the electrical connector shown in Figure 9 cut along line segment CC.

Figure 12 is a schematic cross-sectional view of some components of the electrical connector shown in Figure 9 cut along line segment BB.

Figure 13 is a schematic cross-sectional view of some components of the electrical connector shown in Figure 9 cut along line segment CC.

The following content will be accompanied by drawings to illustrate the technical content of this application through specific concrete embodiments. People familiar with this technology can easily understand other advantages and functions of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the spirit of this application. In particular, the proportional relationship and relative position of each component in the drawings are only for exemplary purposes and do not represent the actual situation of the implementation of this application.

For the description of the embodiments disclosed in this application, please refer to Figures 1 to 13.

The electrical connector provided in this application can be used in electronic products, mainly to provide plug-in docking components to achieve electrical connection to transmit electrical signals. As shown in the embodiments of Figures 1 to 4, the electrical connector 1 is matched with the docking component 2 and includes an insulating rubber core 11. The insulating rubber core 11 has a rubber core body 111, a pressing cantilever 112, a pressing side elastic arm 113, a non-pressing side elastic arm 114 and a buckle structure 115.

The rubber core body 111 is made of, for example, an insulating rubber, and has a pressing side L1 and a non-pressing side L2 opposite to each other and is recessed with a displacement space S.

The head and tail of the pressing arm 112 have a pressing arm hanging end 1121 and a pressing arm engaging end 1122. The pressing arm engaging end 1122 engages with the buckle structure 115, so that the pressing arm engaging end 1122 can be linked with the buckle structure 115. The pressing arm hanging end 1121 is suspended at the pressing side L1, and has an actuating structure so that it can be displaced in the displacement space S under the action of the pressing force, and the buckle structure 115 is actuated by the pressing arm engaging end 1122. It should be noted that when the cantilever arm idle end 1121 is displaced by the pressing force, the cantilever arm joint end 1122 is actuated to activate the buckle structure 115, so that the buckle structure 115 can be changed from a non-actuated state to an actuated state. When the buckle structure 115 is in the actuated state, the buckle structure 115 can move and buckle with the connecting component 2 as shown in FIG. 1 .

The pressing side elastic arm 113 extends below the pressing suspension arm 112 to avoid the displacement space S, so as to prevent the pressing side elastic arm 113 from interfering with the displacement of the pressing suspension arm suspension end 1121, and the head and tail of the pressing side elastic arm 113 have a pressing side elastic arm connection end 1131 and a pressing side elastic arm joint end 1132. The pressing side elastic arm connection end 1131 is connected to the rubber core body 111 at the pressing side connection position P11 of the pressing side L1. The head and tail of the non-pressing side elastic arm 114 have a non-pressing side elastic arm connection end 1141 and a non-pressing side elastic arm joint end 1142. The non-pressing side elastic arm connection end 1141 is connected to the rubber core body 111 at the non-pressing side connection position P12 of the non-pressing side L2.

As shown in FIG8 , the pressing side elastic arm connection end 1131 avoids the pressing arm suspension end 1121 to prevent the pressing side elastic arm connection end 1131 from interfering with the displacement of the pressing arm suspension end 1121. Therefore, the pressing side connection position P11 and the non-pressing side connection position P12 have different heights.

In addition, as shown in FIG3 , the pressing side elastic arm joint end 1132 is engaged with the buckle structure 115 at the pressing side joint position P21, and the non-pressing side elastic arm joint end 1142 is engaged with the buckle structure 115 at the non-pressing side joint position P22. As shown in FIG3 , the pressing side joint position P21 and the non-pressing side joint position P22 have different heights, so that the pressing cantilever arm joint end 1122 and the non-pressing side elastic arm joint end 1142 can be respectively linked with the buckle structure 115 to ensure that the freedom of movement of the buckle structure 115 meets expectations.

Furthermore, as shown in FIG. 3 , the pressing side elastic arm engagement end 1132 is engaged with the pressing cantilever arm engagement end 1122, so that when the pressing cantilever arm idle end 1121 is displaced by the pressing force, the pressing cantilever arm engagement end 1122 can cause the pressing side elastic arm 113 to elastically deform, so that the pressing side elastic arm 113 can provide elastic restoring force to the pressing cantilever arm 112, and force the pressing cantilever arm idle end 1121 to return to the position before being displaced by the pressing force. In this way, the actuating structure of the pressing cantilever arm 112 can be prevented from being deformed by excessive force and yielding, thereby improving the service life of the electrical connector 1.

As shown in the embodiment of FIG. 3 , the non-pressing side elastic arm engagement end 1142 is engaged with the pressing cantilever arm engagement end 1122, so that when the pressing cantilever arm idle end 1121 is displaced by the pressing force, the pressing cantilever arm engagement end 1122 can cause the non-pressing side elastic arm 114 to elastically deform, so that the non-pressing side elastic arm 114 can provide elastic restoring force to the pressing cantilever arm 112, and force the pressing cantilever arm idle end 1121 to return to the position before being displaced by the pressing force. In this way, the actuating structure of the pressing cantilever arm 112 can be prevented from being deformed too much due to excessive force, thereby improving the service life of the electrical connector 1.

In addition, it should be noted that, as shown in the embodiment of FIG. 12 to FIG. 13, when the buckle structure 115 is in the actuated state, the buckle structure 115 is movable to buckle the docking member 2, and causes the pressing side elastic arm 113 and the non-pressing side elastic arm 114 to elastically deform, so that the pressing side elastic arm 113 and the non-pressing side elastic arm 114 can provide the buckle structure 115. The elastic restoring force is provided to force the buckle structure 115 to change from the actuated state to the non-actuated state. In this way, a retaining force can be provided for the plug-in state of the electrical connector 1 and the mating component 2 to maintain the buckle connection of the buckle structure 115 to the mating component 2, and prevent the electrical connector 1 from moving relative to the mating component 2, so as to prevent the electrical connector 1 from easily disengaging from the mating component 2.

In the above embodiment, the pressing side elastic arm 113 and the non-pressing side elastic arm 114 have a U-shaped elastic structure, which can provide longitudinal and lateral elastic restoring force to the buckle structure 115, so as to force the buckle structure 115 to change from the actuated state shown in Figures 12 to 13 to the non-actuated state shown in Figures 10 to 11.

In addition, as shown in the embodiment of FIG. 2 , the pressing suspension arm 112 and the non-pressing side elastic arm 114 constitute an elastic suspension structure A. In this embodiment, the pressing suspension arm hanging end 1121 and the non-pressing side elastic arm connecting end 1141 are respectively located at the head and tail ends of the elastic suspension structure A, and the buckle structure 115 is located at the belly position of the elastic suspension structure A.

In the embodiment shown in FIG. 3 , the pressing side elastic arm 113 and the non-pressing side elastic arm 114 constitute an elastic ring structure B, and the pressing suspension arm joint end 1122 is engaged with the abdomen of the elastic ring structure B, so that when the pressing suspension arm hanging end 1121 is displaced by the pressing pressure, the pressing suspension arm joint end 1122 can cause the elastic ring structure B to elastically move. The elastic ring structure B can provide elastic restoring force to the pressing cantilever arm 112, forcing the cantilever end 1121 of the pressing cantilever arm to return to the position before the displacement by the pressing force. In this way, the actuating structure of the pressing cantilever arm 112 can be prevented from deforming due to excessive force and yielding, thereby improving the service life of the electrical connector 1.

It should be noted that the aforementioned embodiments of the electrical connector of the present application may also omit some components or structures. For example, the electrical connector includes an insulating rubber core, and the insulating rubber core has a rubber core body, a push-down cantilever, a push-down side spring arm, a non-push-down side spring arm and a buckle structure. The push-down cantilever has a push-down cantilever suspended end and a push-down cantilever engagement end. The push-down cantilever suspended end is suspended and can be displaced by the action of a push pressure. The push-down cantilever engagement end is engaged with the buckle structure. The push-down side spring arm has a push-down side spring arm connecting end and a push-down side spring arm engagement end. The pressing side elastic arm connecting end is connected to the rubber core body. The pressing side elastic arm engaging end is engaged with the buckle structure. The non-pressing side elastic arm has a non-pressing side elastic arm connecting end and a non-pressing side elastic arm engaging end. The non-pressing side elastic arm connecting end is connected to the rubber core body. The non-pressing side elastic arm engaging end is engaged with the buckle structure. When the pressing cantilever arm hanging end is displaced by the pressing force, the pressing cantilever arm engaging end is to actuate the buckle structure, so that the buckle structure can be changed from a non-actuated state to an actuated state. When the buckle structure is in the actuated state, the buckle structure can move and buckle the connecting component, and cause the pressing side elastic arm and the non-pressing side elastic arm to elastically deform, so that the pressing side elastic arm and the non-pressing side elastic arm can provide elastic restoring force to the buckle structure, and force the buckle structure to change from the actuated state to the non-actuated state, so as to maintain the buckle structure to the connecting component.

In summary, the electrical connector provided by the present application is matched with a docking structure and has a pressing cantilever, a pressing side spring arm, a non-pressing side spring arm and a buckle structure. The pressing cantilever can be displaced by the pressing force, and the pressing cantilever is connected to the pressing side elastic arm and the non-pressing side elastic arm, so that when the pressing cantilever is displaced by the pressing force, the pressing cantilever can cause the pressing side elastic arm and the non-pressing side elastic arm to elastically deform, so that the pressing side elastic arm and the non-pressing side elastic arm can respectively provide elastic restoring force to the pressing cantilever, and force the pressing cantilever to return to the position before being displaced by the pressing force. In this way, the actuating structure of the pressing cantilever can be prevented from being deformed by excessive force and yielding, thereby improving the service life of the electrical connector.

In addition, the pressing cantilever arm can be displaced by the pressing force to actuate the buckle structure. When the buckle structure is in the actuated state, the buckle structure can move to buckle the mating component, and cause the pressing side elastic arm and the non-pressing side elastic arm to elastically deform, so that the pressing side elastic arm and the non-pressing side elastic arm can provide elastic restoring force to the buckle structure, and force the buckle structure to change from the actuated state to the non-actuated state, so as to maintain the buckle of the buckle structure to the mating component, and prevent the electrical connector from moving relative to the mating component, so as to prevent the electrical connector from easily detaching from the mating component.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present application. Anyone familiar with this technology may modify and alter the above embodiments without violating the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be as listed in the patent scope of the present invention application.

1                                                  Electrical connector 11                                               Rubber core body 112                                              Press-on cantilever arm 1121                                            Press-on cantilever arm cantilever end 1122                                            Press-on cantilever arm engagement end 113                                          Press-on side spring arm 1132                                                Press-on side spring arm engagement end 114                                              Non-press-on side spring arm 1141                                            Non-pressing side spring arm connection end 1142                                            Non-pressing side spring arm engagement end 115                                          Buckle structure B                                              Elastic ring structure S                                              Displacement space L1                                            Pressing side L2                                                Non-pressing side P12                                              Non-pressing side connection position P21                                          Pressing side engagement position P22                                            Non-pressing side engagement position

Claims (11)

An electrical connector is provided, which is matched with a pair of connecting components, and includes: an insulating rubber core, which has a rubber core body, a pressing cantilever, a pressing side spring arm, a non-pressing side spring arm and a buckle structure; wherein, the pressing cantilever has a pressing cantilever hanging end and a pressing cantilever engagement end, the pressing cantilever hanging end is suspended and can be displaced by the pressing force, and the pressing cantilever engagement end is engaged with the buckle structure; The pressing side elastic arm has a pressing side elastic arm connecting end and a pressing side elastic arm engaging end, the pressing side elastic arm connecting end is connected to the rubber core body, and the pressing side elastic arm engaging end is engaged with the buckle structure; The non-pressing side elastic arm has a non-pressing side elastic arm connecting end and a non-pressing side elastic arm engaging end, the non-pressing side elastic arm connecting end is connected to the rubber core body, and the non-pressing side elastic arm engaging end is engaged with the buckle structure; When the cantilever end of the pressing arm is displaced by the pressing force, the engaging end of the pressing arm actuates the buckling structure, so that the buckling structure can be changed from a non-actuated state to a uniformly actuated state; and When the buckling structure is in the actuated state, the buckling structure can be moved to buckle the abutting component, and the pressing side elastic arm and the non-pressing side elastic arm are elastically deformed, so that the pressing side elastic arm and the non-pressing side elastic arm can provide elastic restoring force to the buckling structure, and force the buckling structure to be changed from the actuated state to the non-actuated state, so as to maintain the buckling of the buckling structure to the abutting component. An electrical connector as described in claim 1, wherein the push-side spring arm engagement end also engages with the push-cantilever arm engagement end, so that when the push-side spring arm suspension end is displaced by the push pressure force, the push-side spring arm engagement end can also cause the push-side spring arm to elastically deform, so that the push-side spring arm can provide an elastic restoring force to the push-cantilever arm, thereby forcing the push-side spring arm suspension end to return to the position before it was displaced by the push pressure force. An electrical connector as described in claim 2, wherein the non-pressing side spring arm engagement end is also engaged with the pressing cantilever arm engagement end, so that when the pressing cantilever arm idle end is displaced by the pressing force, the pressing cantilever arm engagement end can also cause the non-pressing side spring arm to elastically deform, so that the non-pressing side spring arm can provide an elastic restoring force to the pressing cantilever, thereby forcing the pressing cantilever arm idle end to return to the position before it was displaced by the pressing force. As described in claim 3, the electrical connector, wherein the pressing cantilever and the non-pressing side elastic arm constitute an elastic cantilever structure, the pressing cantilever free end and the non-pressing side elastic arm connecting end are respectively located at the head and tail ends opposite to each other of the elastic cantilever structure, and the buckle structure is located at the belly position of the elastic cantilever structure. An electrical connector as described in claim 1, wherein the pressing side spring arm and the non-pressing side spring arm form an elastic annular structure, and the pressing cantilever arm engaging end also engages with the belly position of the elastic annular structure, so that when the hanging end of the pressing cantilever arm is displaced by the pressing force, the pressing cantilever arm engaging end can also cause the elastic annular structure to deform elastically, so that the elastic annular structure can provide an elastic restoring force to the pressing cantilever, thereby forcing the hanging end of the pressing cantilever arm to return to the position before it was displaced by the pressing force. As described in claim 1, the rubber core body is recessed with a displacement space, and the displacement space is provided for the cantilever end of the push cantilever to shift therein, and the push side spring arm extends below the push cantilever to avoid the displacement space. An electrical connector as described in claim 1, wherein the push-side spring arm connecting end avoids the push-side spring arm hanging end to prevent the push-side spring arm connecting end from interfering with the displacement of the push-side spring arm hanging end. As described in claim 1, the pressing side spring arm and the non-pressing side spring arm have a U-shaped elastic structure, which can provide longitudinal and lateral elastic restoring forces to the buckle structure. An electrical connector as described in claim 1, wherein the rubber core body has a pressing side and a non-pressing side opposite to each other, the cantilever end of the pressing arm is displaced by the pressing force on the pressing side, the pressing side spring arm connecting end is connected to the rubber core body at the pressing side, and the non-pressing side spring arm connecting end is connected to the rubber core body at the non-pressing side. An electrical connector as described in claim 1, wherein the pressing side spring arm connecting end is connected to the rubber core body at a pressing side connecting position, and the non-pressing side spring arm connecting end is connected to the rubber core body at a non-pressing side connecting position, and the pressing side connecting position is at a different height from the non-pressing side connecting position. An electrical connector as described in claim 1, wherein the pressing side spring arm engaging end engages the snap-on structure at a pressing side engaging position, and the non-pressing side spring arm connecting end engages the snap-on structure at a non-pressing side engaging position, and the pressing side engaging position and the non-pressing side engaging position have different heights.

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