CN221201681U

CN221201681U - Electric connector and elastic clamping piece

Info

Publication number: CN221201681U
Application number: CN202323176134.2U
Authority: CN
Inventors: 陈德法
Original assignee: Ningbo Defa Electronic Technology Co ltd
Current assignee: Ningbo Defa Electronic Technology Co ltd
Priority date: 2023-11-23
Filing date: 2023-11-23
Publication date: 2024-06-21
Anticipated expiration: 2033-11-23

Abstract

The utility model discloses an electric connector and an elastic clamping piece, wherein the elastic clamping piece is positioned in a containing cavity and is integrally bent by a sheet-shaped part to form a first support arm, a bending arm and a second support arm; the connection part of the first support arm and the bending arm forms a first corner structure, and the connection part of the second support arm and the bending arm forms a second corner structure; the bending arm comprises at least two parallel sub-walls, and a hollowed-out part is formed between every two adjacent sub-walls; two ends of the hollowed-out part extend to the first corner structure and the second corner structure respectively; the hollow part is arranged through the bending arm, so that the strength of the bending arm is properly reduced, the elasticity of the bending arm of the elastic clamping piece with a wide surface is reduced, the elastic force of the elastic clamping piece is resisted by the operation piece under a large downward pressure, the operation is more labor-saving and easy, the stability of wiring is ensured, and the rebound relaxation of the elastic clamping piece is avoided.

Description

Electric connector and elastic clamping piece

Technical Field

The present utility model relates to the field of wire connection, and more particularly, to an elastic clamping member and an electrical connector using the same.

Technical Field

The utility model of the authorized bulletin number CN219696718U discloses a labor-saving electric connector and a compression spring plate, wherein the compression spring plate comprises a first arm and a second arm, one end of the first arm is connected with the other end of the second arm, the other end of the first arm is separated from the other end of the second arm, and the second arm is outwards expanded away from the first arm; the first arm is provided with a plane abutting part; the first action part of the control head of the control piece acts on the plane abutting part to downwards extrude the compression spring piece when the control piece is pressed down, so that the second arm is close to the conductor; the second action part is used for acting on the lower surface of the first arm to rotate the compression elastic sheet upwards through the avoidance groove when the control piece is lifted, so that the second arm is far away from the conductor.

In a special case, a plurality of wires need to be inserted into one wiring channel of the electrical connector, which requires a wider width of the pressing spring. When the strip-shaped metal sheet is bent and prepared into the pressing spring sheet in the patent, the bending part is smaller in curvature and overlarge in width, so that bending is difficult, and the process difficulty is high.

After the wire is inserted, the second arm is abutted against the wire, the second arm deforms to enable the bending portion to correspondingly deform in an adaptive manner, and the elasticity of the bending portion of the wide surface is overlarge at the moment, so that the control piece needs larger downward pressure to resist the elasticity of the control piece, and therefore labor saving of operation and structural stability of the electric connector are both tested.

Disclosure of utility model

Based on the problems in the prior art, the utility model provides the electric connector with more labor-saving operation handle pressing and better structural stability, so that the wire connection is easier and more convenient.

The technical scheme adopted for solving the technical problems is as follows: an electrical connector, comprising: the insulation shell is provided with an accommodating cavity, and the accommodating cavity extends to the surface of the insulation shell to form a plug wire hole;

The operating rod is rotatably connected to the insulating shell, one end of the operating rod is positioned in the accommodating cavity, and the other end of the operating rod is positioned on the upper side of the insulating shell and forms a hand pulling part;

The elastic clamping piece is positioned in the accommodating cavity and is integrally bent by the sheet metal part to form a first support arm, a bending arm and a second support arm; the connection part of the first support arm and the bending arm forms a first corner structure, and the connection part of the second support arm and the bending arm forms a second corner structure; the bending arm comprises at least two parallel sub-walls, and a hollowed-out part is formed between every two adjacent sub-walls; two ends of the hollowed-out part extend to the first corner structure and the second corner structure respectively;

The electric conductor is positioned in the accommodating cavity and at the lower side of the elastic clamping piece, and the first support arm of the elastic clamping piece is lifted by the operating piece, so that the second support arm and the electric conductor form a plug wire channel; the first support arm of the elastic clamping piece is pressed by the operating piece, so that the second support arm is close to the electric conductor to press the conductor or close the wire insertion channel.

The preferred technical scheme adopted by the utility model for solving the technical problems is as follows: the tangent line of the first support arm and the bending arm at the connecting position forms an obtuse angle, and the tangent line of the second support arm and the bending arm at the connecting position forms an acute angle.

The preferred technical scheme adopted by the utility model for solving the technical problems is as follows: the bending arm is of an arc structure, and the arc length of the arc structure is greater than four fifths of the circumference of the circle in which the bending arm is located.

The preferred technical scheme adopted by the utility model for solving the technical problems is as follows: the electrical conductor includes a wire contact portion, and first and second pins extending outwardly from the wire contact portion; the wire contact part is used for being matched with the tail end of the second support arm to form a wire insertion channel, and the first pin and the second pin extend out of the surface of the insulating shell from the accommodating cavity.

The preferred technical scheme adopted by the utility model for solving the technical problems is as follows: the wire contact part is of a planar structure positioned on the lower side of the second support arm.

The preferred technical scheme adopted by the utility model for solving the technical problems is as follows: the wire contact part is of a bending structure and comprises a lower contact surface positioned at the lower side of the second support arm and a side extension surface which extends upwards from one side of the lower contact surface away from the wire insertion hole, and the first pin and the second pin extend outwards from the side extension surface.

The utility model solves the technical problems by adopting another technical scheme as follows: an electrical connector, comprising: the insulation shell is provided with an accommodating cavity, and the accommodating cavity extends to the surface of the insulation shell to form a plug wire hole;

The elastic clamping piece is positioned in the accommodating cavity and integrally bent by the sheet-shaped part to form a first support arm, a bending arm and a second support arm; the bending arm comprises at least two parallel sub-walls, and a hollowed-out part is formed between every two adjacent sub-walls;

The other technical scheme adopted by the utility model for solving the technical problems is as follows: the connection part of the first support arm and the bending arm forms a first corner structure, and the connection part of the second support arm and the bending arm forms a second corner structure; two ends of the hollowed-out part extend to the first corner structure and the second corner structure respectively.

The other technical scheme adopted by the utility model for solving the technical problems is as follows: the bending arm is of an arc structure, the arc length of the arc structure is greater than four fifths of the circumference of the circle where the arc structure is located, the tangent line of the first support arm and the bending arm at the joint is an obtuse angle, and the tangent line of the second support arm and the bending arm at the joint is an acute angle.

The other technical scheme adopted by the utility model for solving the technical problems is as follows: the electrical conductor includes a wire contact portion, and first and second pins extending outwardly from the wire contact portion; the wire contact part is used for being matched with the tail end of the second support arm to form a wire insertion channel, and the first pin and the second pin extend out of the surface of the insulating shell from the accommodating cavity.

The utility model solves the technical problems by adopting another technical scheme as follows: an elastic clamping member comprising: the elastic clamping piece is positioned in the accommodating cavity and integrally bent by the sheet-shaped part to form a first support arm, a bending arm and a second support arm; the bending arm comprises at least two parallel sub-walls, and a hollowed-out part is formed between every two adjacent sub-walls;

The bending arm is used for being rotatably connected in the insulating shell, and the free ends of the first support arm and the second support arm are separated from each other;

The first support arm is used for driving the elastic clamping piece to rotate in cooperation with the operating piece on the insulating shell; the second support arm is used for being matched with the electric conductor to form a plug wire channel.

The utility model solves the technical problems by adopting another technical scheme as follows: the elastic clamping piece comprises a first support arm, a bending arm and a second support arm which are formed by integrally bending a sheet metal part; the free ends of the first support arm and the second support arm are separated from each other; the connection part of the first support arm and the bending arm forms a first corner structure, and the connection part of the second support arm and the bending arm forms a second corner structure; the bending arm comprises at least two parallel sub-walls, and a hollowed-out part is formed between every two adjacent sub-walls; two ends of the hollowed-out part extend to the first corner structure and the second corner structure respectively.

Compared with the prior art, the utility model has the advantages that: the hollow part is arranged through the bending arm, so that the strength of the bending arm is properly reduced, the elasticity of the bending arm of the elastic clamping piece with a wide surface is reduced, the elastic force of the elastic clamping piece is resisted by the operation piece under a large downward pressure, the operation is more labor-saving and easy, the stability of wiring is ensured, and the rebound relaxation of the elastic clamping piece is avoided.

Drawings

The utility model will be described in further detail below in connection with the drawings and the preferred embodiments, but it will be appreciated by those skilled in the art that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the utility model. Moreover, unless specifically indicated otherwise, the drawings are merely schematic representations, not necessarily to scale, of the compositions or constructions of the described objects and may include exaggerated representations.

FIG. 1 is a schematic illustration of a single individual of an electrical connector in a preferred embodiment;

FIG. 2 is a schematic diagram II of a single unit of an electrical connector in a preferred embodiment;

FIG. 3 is a schematic view of a splice of an electrical connector in a preferred embodiment;

FIG. 4 is an exploded view of the electrical connector in a preferred embodiment;

FIG. 5 is a schematic view of the electrical connector in a depressed state of the control in a preferred embodiment;

FIG. 6 is a schematic view of the electrical connector in a lever up state in accordance with a preferred embodiment;

FIG. 7 is a schematic illustration of a single individual of an electrical connector in another preferred embodiment;

FIG. 8 is a schematic diagram II of a single unit of an electrical connector in another preferred embodiment;

FIG. 9 is a schematic view of a splice of an electrical connector in another preferred embodiment;

FIG. 10 is an exploded view of an electrical connector in another preferred embodiment;

FIG. 11 is a schematic view of the electrical connector in a depressed state of the control in another preferred embodiment;

FIG. 12 is a schematic view of the electrical connector in a lever up state in accordance with another preferred embodiment;

FIG. 13 is a schematic view of a resilient clamping member in a preferred embodiment;

FIG. 14 is a schematic diagram II of the resilient clamping member in the preferred embodiment;

FIG. 15 is a schematic view of an electrical conductor in a preferred embodiment;

fig. 16 is a schematic view of an electrical conductor in another preferred embodiment.

Detailed Description

Preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative, exemplary, and should not be construed as limiting the scope of the utility model.

It should be noted that: like reference numerals denote like items in the following figures, and thus once an item is defined in one figure, it may not be further defined and explained in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "front", "rear", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model. While the terms "first" and "second" are used for descriptive purposes only and not for purposes of limitation, there is no other directional meaning.

As shown in fig. 1-12, two preferred embodiments provide an electrical connector comprising an insulative housing 100, an operating member 200, a resilient clamping member 300 that deforms under the control of the operating member 200, and an electrical conductor 400 that cooperates with the resilient clamping member 300 to form a wire insertion path S that retains a wire.

As shown in fig. 1-12, the insulating housing 100 has a plurality of accommodating cavities Q, and the accommodating cavities Q extend to the surface of the insulating housing 100 to form a plurality of wire insertion holes K. The insulating housing 100 may be a stand-alone housing, that is, one insulating housing 100 corresponds to one accommodating cavity Q and one plug wire hole K.

And the integrated multi-interface type electric connector can be formed by combining and splicing the side connection structures.

As shown in fig. 1, 4, 6 and 10, preferably, the insulating housing 100 is composed of a housing body 101 and a lateral housing cover 102, and the housing body 101 and the housing cover 102 are detachably connected through a snap connection, so that the housing cover 102 is conveniently opened laterally, the accommodating cavity Q is opened, and the construction of the operating member 200, the elastic clamping member 300, the electrical conductor 400 and the like inside is conveniently assembled and maintained.

For the multi-interface type electrical connector, as shown in fig. 2-4 and 8-11, the insulating housing 100 is integrally formed by a plurality of housing bodies 101 and a housing cover 102, wherein a first side surface of the housing body 101 is provided with a plurality of concave holes e, and an opposite second side surface is provided with a plurality of protrusions f. The splicing structure is formed by inserting the concave holes e and the protrusions f, and the shell cover 102 is used for closing a shell body 101 with an open edge through the corresponding connecting structure to form an integral insulating shell with a plurality of parallel plug wire holes K with consistent height.

Preferably, the sealing surface of the housing body 101 is provided with a plurality of concave holes e, the opening surface of the housing body 101 is provided with a plurality of protrusions f matched with the concave holes e in position and size, the inner side surface of the housing cover 102 is provided with a through hole h matched with the protrusions f, the position relations of the concave holes e and the through hole h are opposite, and the inner diameters are generally basically consistent.

As shown in fig. 4 to 6 and 10 to 12, the operating member 200 is rotatably connected to the insulating housing 100 through a rotation shaft T so as to be rotatable with respect to the insulating housing 100, one end of the operating member 200 is located in the accommodating chamber Q to form an acting portion 201, and the other end is located on the upper side of the insulating housing 100 to form a hand plate portion 202. The free end of the lever 202 is located on the side near the wire insertion hole K.

The lever portion 202 and the action portion 201 are integrally formed, and are mutually influenced by force transmission. The lever 202 is a force application end of a user, and the rotation of the operating member 200 is realized by applying forces in different directions to the lever, that is, the acting portion 201 rotates around the pivot portion. While the action portion 201 applies a force to the elastic clamping member 300, it also receives a reverse force of the elastic clamping member 300, which is also transmitted to the user through the lever portion 202 by force transmission. As shown in fig. 3 to 8, the elastic clamping member 300 is provided in the insulating housing 100 at the lower side of the acting portion 201. The rotation of the action part 201 realizes the control of different forms of the elastic clamping piece 300.

As shown in fig. 5-6, 11-12, the resilient clamping member 300 is positioned within the receiving cavity.

As shown in fig. 5-6, 11-12, and 13-14, the elastic clamping member 300 includes a first arm 301, a bending arm 303, and a second arm 302 integrally bent from a sheet member. The free ends of the first arm 301 and the second arm 302 are remote from each other. When the first arm 301 is subjected to a downward force, and the second arm 302 is not limited by other forces, the downward force on the first arm 301 will drive the resilient clamping member 300 to rotate downward as a whole.

13-14, The junction of the first arm 301 and the flexure arm 303 forms a first corner formation r1 and the junction of the second arm 302 and the flexure arm 303 forms a second corner formation r2; the bending arm 303 includes at least two parallel sub-walls y, and a hollowed-out portion j is formed between the adjacent sub-walls y.

The strength of the bending arm is properly reduced by the arrangement of the hollowed-out part j, so that the elasticity of the bending arm 303 of the wide-surface elastic clamping piece 300 is reduced, the operation piece 200 needs a large downward pressure to resist the elasticity of the operation piece, the operation is more labor-saving and easy, the stability of wiring is ensured, and the elastic clamping piece 300 is prevented from rebounding and loosening.

Preferably, the elastic clamping member 300 is formed by punching a plurality of elongated holes extending in the longitudinal direction of the metal sheet member at intervals from the metal sheet member in a middle region, then performing a bending process, forming a bending arm 303 in the region having the elongated holes in the middle, and forming a first arm 301 and a second arm 302 at both end portions, respectively.

As shown in fig. 5-6, 11-12, and 15-16, the electrical conductor 400 is located in the accommodating cavity Q and is located at the lower side of the elastic clamping member 300, and the first arm 301 of the elastic clamping member 300 is lifted by the operation member 200, so that the second arm 302 and the electrical conductor 400 form a wire insertion channel S. The first arm 301 of the elastic clamping member 300 is pressed by the operating member 200, so that the second arm 302 approaches the electrical conductor 400 to press the conductor or close the wire insertion channel.

When the free end of the second arm 302, i.e., the end of the second arm 302, is blocked, the downward force on the first arm 301 will cause the first arm 301 to draw closer to the second arm 302 and deform, which is transmitted to the second arm 302, such that the second arm 302 will assume a downward tendency to expand and exert downward pressure on the member blocking the end of the second arm 302. The means for blocking the end of the second arm 302 may be a wire inserted into the wire insertion channel S or may be the electrical conductor 400 itself.

Preferably, the total width of the hollowed-out portion j accounts for 25% -50% of the width of the elastic clamping member 300. The first is to make the elastic clamping member 300 easy to be formed by a sheet metal bending process; secondly, the elastic clamping piece 300 keeps proper elasticity, so that the wire can be clamped and rebound relaxation is avoided; thirdly, the strength of the elastic clamping piece 300 can be ensured in the whole value range, and stress breakage caused by strength reduction due to the hollow structure in the repeated use process is avoided.

In this embodiment, as shown in fig. 13-14, the bending arm 303 includes two equally wide dividing walls y, and the width of the hollowed-out portion j between the two dividing walls y is slightly smaller than the width of the dividing wall y.

Preferably, both ends of the hollowed-out portion j extend to the first corner configuration r1 and the second corner configuration r2, respectively.

It should be noted that the first arm 301 is connected to the bending arm 303 at an angle, i.e. the angle is larger than 0 ° and smaller than 180 °, so that the connection between the first arm 301 and the bending arm 303 is a break point of the fold line in the longitudinal section, and the first corner structure r1 is actually a first strip structure extending along the width direction of the elastic clamping member 300, and the section of the first strip structure is preferably arc-shaped, i.e. the first arm 301 and the bending arm 303 are rounded.

Similarly, the second arm 302 is connected to the bending arm 303 at an angle greater than 0 ° and less than 180 °, so that the connection between the second arm 302 and the bending arm 303 is a break point of a broken line in the longitudinal section, and the second corner structure r2 is a second strip structure extending along the width direction of the elastic clamping member 300, and the section of the second strip structure is preferably arc-shaped, that is, the second arm 302 and the bending arm 303 are rounded.

Both ends of the hollowed-out portion j extend to the first corner structure r1 and the second corner structure r 2. But the first corner formation r1 and the second corner formation r2 still retain a strip-like formation partially along the through width. Such an arrangement avoids stress cracking caused by too low strength at the corners.

Preferably, the tangent line of the first arm 301 and the curved arm 303 at the connection is obtuse, and the tangent line of the second arm 302 and the curved arm 303 at the connection is acute.

As shown in fig. 4, 5, 10, and 11, the bending arm 303 has a circular arc structure. A cylindrical pivot R is disposed on the insulating housing 100, and the bending arm 303 is sleeved outside the cylindrical pivot, so that the cooperation of the two arc surfaces is more beneficial to the rotation of the elastic clamping member 300. The supporting effect of the pivot on the bending arm 303 can also weaken the influence of the hollowed-out portion j on the strength of the elastic clamping piece 300, so that the possibility of fracture of the bending arm 303 can be reduced.

Further, the arc length of the arc structure is more than four fifths of the circumference of the circle in which the arc structure is positioned. The bending arm winds the pivot shaft mostly therein, so that the elastic clamping member 300 is prevented from being separated and the support of the pivot shaft R is enhanced.

Preferably, as shown in fig. 1, 5, 6, 8, 9, 11, 12, 15, 16, the electrical conductor 400 comprises a wire contact 401 and a first pin 402 and a second pin 403 extending outwardly from the wire contact 401; the wire contact portion 401 is configured to cooperate with the end of the second arm 302 to form a wire insertion channel S, and the first pin 402 and the second pin 403 extend from the accommodating cavity Q to the surface of the insulating housing 100.

In one embodiment, as shown in fig. 1, 5, 6, and 15, the wire contact 401 is a planar structure located on the underside of the second arm 302. The first pin 402 and the second pin 403 extend downward from the wire contact portion 401 to be located at the lower side of the insulating housing 100 away from the operation member 200. The upper surface of the wire contact 401 is provided with a groove w having an arcuate bottom surface for mating engagement with the end of the second arm 302.

In another embodiment, as shown in fig. 8, 9, 11, 12 and 16, the wire contact portion 401 is a bent structure, and includes a lower contact surface a located on the lower side of the second arm 302 and a side extension surface b extending upward from the side of the lower contact surface a away from the wire insertion hole K, and the first pin 402 and the second pin 403 extend laterally outward from the side extension surface b and are located on the side of the insulating housing 100 away from the wire insertion hole K. The upper surface of the lower contact surface a of the wire contact portion 401 is provided with a groove w having an arcuate bottom surface for mating engagement with the end of the second arm 302.

The electrical connector and the elastic clamping member provided by the utility model are described above, and specific examples are applied to illustrate the principle and the implementation of the utility model, and the description of the examples is only used for helping to understand the utility model and the core idea. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims

1. An electrical connector, comprising:

The insulation shell is provided with an accommodating cavity, and the accommodating cavity extends to the surface of the insulation shell to form a plug wire hole;

The operating piece is rotatably connected to the insulating shell, one end of the operating piece is positioned in the accommodating cavity, and the other end of the operating piece is positioned on the upper side of the insulating shell and forms a hand pulling part;

The elastic clamping piece is positioned in the accommodating cavity and integrally bent by the sheet-shaped part to form a first support arm, a bending arm and a second support arm; the connection part of the first support arm and the bending arm forms a first corner structure, and the connection part of the second support arm and the bending arm forms a second corner structure; the bending arm comprises at least two parallel sub-walls, and a hollowed-out part is formed between every two adjacent sub-walls; two ends of the hollowed-out part extend to the first corner structure and the second corner structure respectively;

2. The electrical connector of claim 1, wherein the tangent of the first arm at the junction with the curved arm is at an obtuse angle and the tangent of the second arm at the junction with the curved arm is at an acute angle.

3. The electrical connector of claim 1, wherein the curved arms are in a circular arc configuration having an arc length greater than four fifths of the circumference of the circle in which they are located.

4. The electrical connector of claim 1, wherein the electrical conductor includes a wire contact and first and second pins extending outwardly from the wire contact; the wire contact part is used for being matched with the tail end of the second support arm to form a wire insertion channel, and the first pin and the second pin extend out of the surface of the insulating shell from the accommodating cavity.

5. The electrical connector of claim 4, wherein the wire contact is a planar structure on the underside of the second arm.

6. The electrical connector of claim 4, wherein the wire contact portion is of a bent configuration including a lower contact surface on the underside of the second arm and a side extension surface extending upwardly from a side of the lower contact surface remote from the wire insertion hole, the first and second pins extending laterally outwardly from the side extension surface.

7. An electrical connector, comprising:

8. The electrical connector of claim 7, wherein the connection of the first arm and the curved arm forms a first corner configuration and the connection of the second arm and the curved arm forms a second corner configuration; two ends of the hollowed-out part extend to the first corner structure and the second corner structure respectively.

9. The electrical connector of claim 7, wherein the curved arm has a circular arc configuration with an arc length greater than four fifths of the circumference of the circle in which the curved arm is positioned, the tangent line of the first arm at the junction with the curved arm is at an obtuse angle, and the tangent line of the second arm at the junction with the curved arm is at an acute angle.

10. The electrical connector of claim 9, wherein the electrical conductor includes a wire contact and first and second pins extending outwardly from the wire contact; the wire contact part is used for being matched with the tail end of the second support arm to form a wire insertion channel, and the first pin and the second pin extend out of the surface of the insulating shell from the accommodating cavity.

11. Elastic clamping piece, its characterized in that includes:

12. The spring clamp of claim 11, wherein the connection of the first arm to the flexure arm forms a first corner configuration and the connection of the second arm to the flexure arm forms a second corner configuration; two ends of the hollowed-out part extend to the first corner structure and the second corner structure respectively.

13. The spring clip of claim 12 wherein the curved arm has a circular arc configuration with an arc length greater than four fifths of the circumference of the circle in which the curved arm is positioned, the tangent line of the first arm at the junction with the curved arm being at an obtuse angle, and the tangent line of the second arm at the junction with the curved arm being at an acute angle.

14. The elastic clamping piece is characterized by comprising a first support arm, a bending arm and a second support arm which are formed by integrally bending a sheet metal part; the free ends of the first support arm and the second support arm are separated from each other; the connection part of the first support arm and the bending arm forms a first corner structure, and the connection part of the second support arm and the bending arm forms a second corner structure; the bending arm comprises at least two parallel sub-walls, and a hollowed-out part is formed between every two adjacent sub-walls; two ends of the hollowed-out part extend to the first corner structure and the second corner structure respectively.

15. The spring clip of claim 14 wherein the curved arm has a circular arc configuration with an arc length greater than four fifths of the circumference of the circle in which the curved arm is positioned, the tangent line of the first arm at the junction with the curved arm being at an obtuse angle, and the tangent line of the second arm at the junction with the curved arm being at an acute angle.