Miniaturized elastic contact

Abstract

The invention discloses a miniaturized elastic contact which comprises an elastic spring coil, the elastic spring coil is composed of an elastic part in the middle and connecting parts at the two ends, and a plurality of air gaps are formed in the elastic part in a staggered mode; when the elastic contact element is subjected to inward axial extrusion force, the elastic spring coil shrinks towards the inner side, the elastic part of the elastic spring coil is integrally shortened through deformation of an air gap, the extrusion force is converted into the elastic force of the elastic spring coil, and after the external axial extrusion force disappears, the ejector pins at the two ends of the elastic spring coil are in contact with the elastic contact element under the action of the elastic force of the elastic spring coil. And an initial state is recovered by bouncing outwards. The overall length size of the elastic pin contact element can be adjusted according to needs, and the axial length change of the elastic spring coil and the design of different shapes in the elastic spring coil can enable the miniaturized elastic contact element to have different compression amounts and compression forces, so that the elastic contact element is ensured to have stable compression forces and compression strokes, and the applicability of the elastic contact element is higher.

Description

Technical Field

[0001] The invention belongs to the technical field of connector accessories, and in particular relates to a miniaturized elastic contact piece. Background Art

[0002] As electronic devices develop towards miniaturization, modularization and low cost, the interconnection plug-ins used inside the equipment are required to be smaller and smaller, higher in density and lower in cost. Therefore, the internal connection carriers - contacts - are also required to be miniaturized and micro-miniaturized.

[0003] As the contact spacing gradually decreases, the more mature through-hole soldering and fisheye crimping termination methods commonly used in connectors can no longer meet the needs of miniaturization and high density. Summary of the invention

[0004] The present invention aims at solving the problems in the prior art and proposes the following technical solutions:

[0005] A miniaturized elastic contact piece comprises: an elastic spring coil, the elastic spring coil comprises an elastic part in the middle and connecting parts at both ends, the elastic part is staggered with a plurality of air gaps;

[0006] When the elastic contact piece is subjected to an inward axial extrusion force, the elastic spring coil contracts inward, and its elastic part is deformed by the air gap and shortened as a whole, converting the extrusion force into the elastic force of the elastic spring coil itself. After the external axial extrusion force disappears, the ejectors at both ends bounce outward under the elastic force of the elastic spring coil and return to their initial state.

[0007] As a preferred embodiment of the above technical solution, the elastic spring coil is a cylindrical hollow structure, and the elastic spring coil is formed by bending a metal sheet. The elastic part includes a plurality of extension arms, and a connecting arm is provided between two adjacent extension arms and between the extension arm and the connecting part. After the elastic spring coil is bent and formed, the gap between the connecting arm and the extension arm or the gap between the connecting arm and the connecting part forms an air gap.

[0008] As a preferred embodiment of the above technical solution, two adjacent connecting arms are arranged in a staggered manner, and after the elastic spring coil is bent and formed, the projections of the two adjacent connecting arms in the axial direction of the elastic spring coil are symmetrically arranged.

[0009] As a preferred embodiment of the above technical solution, the connecting portion includes a plane area, an air cavity is formed in the middle of the plane area when the elastic spring coil is bent into the connecting portion, and a ejector pin is movably inserted in the middle of the air cavity.

[0010] As a preferred embodiment of the above technical solution, the ejector pin is composed of a front end contact area, a middle limiting area and a tail end connecting area, and a plurality of convex ribs are designed on the surface of the connecting area. The ejector pin is connected to the inner wall of the air cavity of the elastic spring leaf through the plurality of convex ribs in the connecting area, and a guide groove is designed at the head of the connecting area, and the guide groove is used to install the guide ejector pin.

[0011] As a preferred embodiment of the above technical solution, a plurality of contact convex humps are evenly arranged on the circumference of the front part of the contact area, and the contact convex humps are used for crimping contact with the plane to increase the contact points.

[0012] As a preferred embodiment of the above technical solution, the limiting area is provided with a positioning step, and the positioning step is used for axial positioning with the elastic spring leaf.

[0013] The beneficial effects of the present invention are:

[0014] 1. The elastic contact is a cylindrical structure. The ejector pin can be axially compressed and rebounded. The overall length of the elastic pin contact can be adjusted as needed. The axial length of the elastic spring coil and the different internal shapes can be designed to make the miniaturized elastic contact have different compression amounts and compression forces. While ensuring that the elastic contact has stable compression force and compression stroke, the elastic contact has the characteristics of low cost, vertical elastic contact, miniaturization, and convenient installation. It is suitable for high-speed signal, small current and low-frequency signal transmission between parallel plates, and can also be used for vertical interconnection of high-density signals inside modules;

[0015] 2. The elastic spring coil is formed by a thin sheet of metal that is punched into a certain shape through a die and then rolled into a round shape. The elastic part in the middle area is used to play an elastic role. The elastic changes of the connecting arms at the two space gap positions provide elastic deformation and reset for the elastic contact, which increases the elastic strength of the elastic contact and improves its fatigue life.

[0016] 3. The connecting parts at both ends of the elastic spring coil are fitted by interference fit, and the circumference is wrapped around the tail end connection area of ​​the ejector pin to achieve mutual connection. The connection performance between the elastic spring coil and the ejector pin is better, which prevents the ejector pin from detaching from the elastic spring coil during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 What is shown is a schematic diagram of the overall structure of an embodiment;

[0018] Figure 2 Shown is an exploded schematic diagram of an embodiment;

[0019] Figure 3 Shown is a front view of the elastic spring coil in the embodiment;

[0020] Figure 4 What is shown is a flattened state diagram of the elastic spring coil in the embodiment;

[0021] Figure 5 Shown is a front view of the ejector pin in the embodiment;

[0022] Figure 6 Shown is a diagram showing the change in compression state of the elastic contact member in the embodiment.

[0023] In the figure: 10, elastic spring coil; 11, elastic part; 111, extension arm; 112, connecting arm; 12, connecting part; 121, plane area; 122, air cavity; 13, air gap; 20, ejector pin; 21, contact area; 211, contact bulge; 22, limiting area; 221, positioning step; 23, connecting area; 231, convex rib; 232, guide groove; F1, small axial pressure; F2, large axial pressure; X1, small displacement; X2, large displacement; a, small angle; b, large angle. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings of the specification.

[0025] Example

[0026] Figure 1-Figure 6 In the embodiment, the miniaturized elastic contact element comprises: an elastic spring coil 10, wherein the elastic spring coil 10 comprises an elastic portion 11 in the middle and connecting portions 12 at both ends, wherein the elastic portion 11 is staggered with a plurality of air gaps 13;

[0027] When the elastic contact piece is subjected to an inward axial extrusion force, the elastic spring coil 10 contracts inwardly, and its elastic portion 11 is deformed and shortened as a whole through the air gap 13, thereby converting the extrusion force into the elastic force of the elastic spring coil 10 itself. After the external axial extrusion force disappears, the ejector pins 20 at both ends are bounced outwardly under the elastic force of the elastic spring coil 10 and return to their initial state.

[0028] The elastic contact piece has an overall cylindrical structure, and the ejector pin 20 can be axially compressed and rebounded. The overall length of the elastic needle contact piece can be adjusted as needed. The change in the axial length of the elastic spring coil 10 and the different shape designs inside it can make the miniaturized elastic contact piece have different compression amounts and compression forces, ensuring that the elastic contact piece has a stable compression force and compression stroke while making it more applicable.

[0029] Figure 1-Figure 4In the embodiment, the elastic spring coil 10 is a cylindrical hollow structure, and the elastic spring coil 10 is formed by bending a metal sheet. The elastic portion 11 includes a plurality of extension arms 111, and a connecting arm 112 is provided between two adjacent extension arms 111 and between the extension arm 111 and the connecting portion 12. After the elastic spring coil 10 is bent and formed, the gap between the connecting arm 112 and the extension arm or the gap between the connecting arm 112 and the connecting portion 12 forms an air gap 13.

[0030] The two adjacent connecting arms 112 are arranged in a staggered manner. After the elastic spring coil 10 is bent and formed, the projections of the two adjacent connecting arms 112 on the axial direction of the elastic spring coil 10 are symmetrically arranged.

[0031] The elastic spring coil 10 as a whole is made of a thinner metal sheet that is punched into a certain shape by a die and then formed by a rolling process. The whole is a cylindrical hollow structure. The elastic part 11 in the middle area is used to play an elastic role. The elastic changes of the connecting arms 112 at the two spatial gap positions provide elastic deformation and reset for the elastic contact piece, thereby increasing the elastic strength of the elastic contact piece and improving its fatigue life.

[0032] Figure 3-Figure 5 In the embodiment, the connecting portion 12 comprises a plane area 121 , and an air cavity 122 is formed in the middle of the plane area 121 when the elastic spring coil 10 is bent into the connecting portion 12 , and a ejector pin 20 is movably inserted in the middle of the air cavity 122 .

[0033] The ejector pin 20 is composed of a front end contact area 21, a middle limiting area 22 and a rear end connecting area 23. A plurality of convex ribs 231 are designed on the surface of the connecting area 23. The ejector pin 20 is connected to the inner wall of the air cavity 122 of the elastic spring leaf through the plurality of convex ribs 231 of the connecting area 23. A guide groove 232 is designed at the head of the connecting area 23. The guide groove 232 is used to install the guide ejector pin 20.

[0034] A plurality of contact bumps 211 are evenly arranged on the front circumference of the contact area 21 , and the contact bumps 211 are used for crimping contact with a plane to increase contact points.

[0035] The limiting area 22 is provided with a positioning step 221, and the positioning step 221 is used for axial positioning with the elastic spring.

[0036] The connecting parts 12 at both ends of the elastic spring coil 10 are fitted by interference fit and circumferentially wrapped around the tail end connecting area 23 of the ejector pin 20 to achieve mutual connection. The connection performance between the elastic spring coil 10 and the ejector pin 20 is better, and the ejector pin 20 is prevented from being separated from the inside of the elastic spring coil 10 during use.

[0037] Working principle: When receiving axial extrusion force, the ejector pin 20 at one end of the elastic contact piece usually does not move. When the ejector pin 20 at the other end is subjected to the small axial pressure F1, the elastic contact piece as a whole will shrink toward the middle, which is specifically manifested as the elastic spring piece being compressed toward the middle, the air gap 13 gradually becoming smaller and absorbing the pressure, and the two adjacent extension arms being compressed toward the middle with the middle connecting arm 112 as the fulcrum, forming a smaller small angle a, and the ejector pin 20 forming an axial compression small displacement X1; when the ejector pin 20 at the other end is subjected to the large axial pressure F2, the elastic contact piece as a whole will further shrink toward the middle, the air gap 13 will further become smaller to absorb the pressure, and the two adjacent extension arms on the elastic spring piece will continue to be compressed toward the middle with the connecting arm 112 as the fulcrum, forming a larger large angle b, and the ejector pin 20 forming an axial compression large displacement X2. When the external axial pressure disappears, the ejector pins 20 at both ends will bounce outward under the elastic force of the elastic spring coil 10 and return to their initial state.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. Miniaturized elastic contact, including: The elastic spring coil (10) is characterized in that the elastic spring coil (10) consists of a middle elastic part (11) and two end connecting parts (12), and the elastic part (11) is staggered with a plurality of air gaps (13); When the elastic contact piece is subjected to an inward axial squeezing force, the elastic spring coil (10) contracts inwardly, and its elastic portion (11) is deformed through the air gap (13) and shortened as a whole, thereby converting the squeezing force into the elastic force of the elastic spring coil (10) itself. After the external axial squeezing force disappears, the ejector pins (20) at both ends are ejected outwardly under the elastic force of the elastic spring coil (10) and return to their initial state.

2. The miniaturized elastic contact according to claim 1, characterized in that: The elastic spring coil (10) is a cylindrical hollow structure, and the elastic spring coil (10) is formed by bending a metal sheet. The elastic part (11) includes a plurality of extension arms (111), and a connecting arm (112) is provided between two adjacent extension arms (111) and between the extension arm (111) and the connecting part (12). After the elastic spring coil (10) is bent and formed, a gap between the connecting arm (112) and the extension arm or a gap between the connecting arm (112) and the connecting part (12) forms an air gap (13).

3. The miniaturized elastic contact member according to claim 2, characterized in that: Two adjacent connecting arms (112) are arranged in a staggered manner, and after the elastic spring coil (10) is bent and formed, the projections of the two adjacent connecting arms (112) in the axial direction of the elastic spring coil (10) are symmetrically arranged.

4. The miniaturized elastic contact member according to claim 2, characterized in that: The connecting portion (12) comprises a plane area (121), an air cavity (122) is formed in the middle of the plane area (121) when the elastic spring coil (10) is bent into the connecting portion (12), and a pin (20) is movably inserted in the middle of the air cavity (122).

5. The miniaturized elastic contact member according to claim 4, characterized in that: The ejector pin (20) is composed of a front end contact area (21), a middle limiting area (22) and a rear end connecting area (23); a plurality of convex ribs (231) are designed on the surface of the connecting area (23); the ejector pin (20) is connected to the inner wall of the air cavity (122) of the elastic spring leaf through the plurality of convex ribs (231) of the connecting area (23); and a guide groove (232) is designed at the head of the connecting area (23); the guide groove (232) is used to install the guide ejector pin (20).

6. The miniaturized elastic contact member according to claim 5, characterized in that: A plurality of contact convex bumps (211) are evenly arranged on the front circumference of the contact area (21), and the contact convex bumps (211) are used for crimping contact with a plane to increase contact points.

7. The miniaturized elastic contact member according to claim 5, characterized in that: The limiting area (22) is provided with a positioning step (221), and the positioning step (221) is used for axial positioning with the elastic spring sheet.

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