Elastic contact with pawl spring structure

Abstract

An elastic contact with a pawl spring structure comprises a pin, a spring and a sleeve, the sleeve is an integrally rolled pawl spring sleeve formed by winding a metal sheet, a pawl spring integrally formed with the sleeve is arranged at one end, used for connecting the pin, of the integrally rolled pawl spring sleeve, the root of the pawl spring is connected with the side face of the sleeve, and the pawl spring is in interference contact with the connected pin; the spring is sleeved on the contact pin, and two ends of the spring respectively abut against the contact pin and the integrally rolled pawl spring sleeve. According to the utility model, the number of parts is small, the assembly is simple, the anti-vibration performance is good, the contact reliability of a product is improved, and high-density node arrangement can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of spring pins, and in particular relates to an elastic contact piece with a claw spring structure. Background Art

[0002] At present, domestic spring pins are mainly used in the field of consumer electronics, and the contact diameter is above 1.0mm, and the test probe diameter is between 0.1mm and 1.0mm. The spring pins of the above specifications are widely used in the field of domestic consumer electronics. Since spring pins have solder-free contact, are easy to clean, and have a larger tolerance than traditional contacts, they have great advantages in flat applications.

[0003] The spring pins currently on the market mainly have the following structures:

[0004] The first structure: the spring needles are composed of a needle tube, a spring, and a contact, as described in EP3627630A1. In order to ensure that the contact can move freely in the needle tube, the spring needles of this type of structure have a clearance fit. Under vibration conditions, there is a clearance fit between the contact and the needle tube, which causes current to flow through the spring. The spring resistance is large, which can easily cause spring erosion. In addition, the contact point and contact state of this type of structure change during each compression and rebound process, which can lead to unstable contact resistance.

[0005] The second structure: The spring pin adopts a claw spring structure, which is composed of a pin, a spring, a sleeve, a spring claw and a sheath. This type of structure is described in CN216055285U. This type of product requires the spring claw to be assembled with the sleeve by interference fit, which increases the assembly cost. At the same time, improper interference fit between the spring claw and the sleeve can easily cause poor contact between the spring claw and the sleeve, abnormal contact resistance, and the product diameter cannot be made smaller, and cannot be used in the field of high-density node arrangement. Utility Model Content

[0006] The purpose of the utility model is to provide an elastic contact piece with a claw spring structure, which is composed of three parts: a pin, a spring, and an integrally rolled claw spring sleeve. It has a small number of parts, simple assembly, good vibration resistance, improved contact reliability of the product, and is conducive to achieving high-density node arrangement, thereby solving the above-mentioned technical problems.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a claw spring structure elastic contact piece, including a pin, a spring and a sleeve, the sleeve is an integrally wound claw spring sleeve formed by winding a metal sheet, and the end of the integrally wound claw spring sleeve for connecting the pin is provided with a claw spring integrally formed with the sleeve, the root of the claw spring is connected to the side of the sleeve, and the claw spring is in interference contact with the connected pin; the spring is sleeved on the pin, and the two ends of the spring are respectively pressed against the pin and the integrally wound claw spring sleeve.

[0008] The beneficial effect is that the plug pin is compressed when the utility model is used, and the plug pin can float backward due to the support of the spring, and the current is transmitted to the claw spring at the end of the sleeve through the plug pin, and the claw spring and the plug pin are in interference contact, and the current is transmitted to the wire connected to the tail end of the sleeve. Since the claw spring and the plug pin are transmitted through positive pressure, it has high vibration resistance and ensures reliable contact between the claw spring and the plug pin.

[0009] Since the integrally rolled claw spring sleeve is integrally stamped and rolled, a smaller outer diameter size can be achieved, thereby achieving a high-density node arrangement.

[0010] A side opening is provided on the side of the integrally wound claw spring sleeve, and the claw spring is located in the side opening and is bent toward the center of the integrally wound claw spring sleeve.

[0011] The beneficial effect is that a specific implementation method of the integrated structure of the claw spring and the sleeve is proposed, which can reduce the risk of plastic deformation of the claw spring.

[0012] The claw spring is symmetrically arranged on the integrally rolled claw spring sleeve.

[0013] The beneficial effect is that the symmetrical arrangement of the claw springs can ensure that the pressure acting on the pins is more balanced, further ensuring the vibration resistance of the product.

[0014] A plurality of strong installation barbs are arranged on the side surface of the integrally wound claw spring sleeve. When a plurality of strong installation barbs are arranged, the plurality of strong installation barbs are arranged at intervals along the circumferential direction.

[0015] The beneficial effect is that when the contact piece is installed into the insulator, the barbs are strongly installed and stuck on the inner wall of the insulator to prevent the contact piece from retreating.

[0016] The side surface of the integrally wound claw spring sleeve is also provided with an assembly positioning step, and the assembly positioning step is a reduced diameter section, or the assembly positioning step is a step block protruding from the side surface of the integrally wound claw spring sleeve.

[0017] The beneficial effect is that during the assembly process of the contact piece and the insulator, it can be indicated that the contact piece is assembled in place, thereby preventing the assembly position from being too deep.

[0018] A blocking film is also arranged in the integrally wound claw spring sleeve.

[0019] The beneficial effect is to prevent the glue from flowing back when the tail of the contact is filled with glue, thereby ensuring the floating function of the pin.

[0020] A limiting step is arranged on the insertion pin, and the end surface of the end of the integrally wound claw spring sleeve is a spring supporting surface, and the two ends of the spring are respectively pressed against the limiting step and the spring supporting surface.

[0021] The beneficial effect is that the end of the spring is provided with positioning, and at the same time, the limiting step can also press against the stop surface in the insulator after the contact piece is installed in the insulator, so as to prevent the contact piece from falling off.

[0022] The limiting step is a circle of annular protrusions extending circumferentially, or the limiting step is a plurality of protrusions arranged at intervals in the circumferential direction.

[0023] The beneficial effect is that two easily implementable structural forms of limiting steps are proposed, and implementers have stronger selectivity.

[0024] The tail end of the plug pin is provided with a plug pin chamfer.

[0025] The beneficial effect is that when the pin is installed into the integrally rolled claw spring sleeve, the chamfer of the pin can play a role in guiding the assembly.

[0026] The tail end of the pin is provided with a pin chamfer and a root cleaning step, the root cleaning step is located in front of the pin chamfer, the end of the claw spring extends to the rear end of the integrally rolled claw spring sleeve, and is interference fit with the pin at the root cleaning step.

[0027] The beneficial effects are as follows: the setting of the root cleaning step can prevent the pin from being inserted too deeply into the integrated rolled claw spring sleeve, avoid affecting the floating of the pin, and prevent the pin from being separated from the integrated rolled claw spring sleeve before the contact piece is installed into the insulator.

[0028] The principle of the utility model is: the contact piece of the utility model is used between printed boards or assembled in a plug and used in conjunction with a socket. When in use, the printed board compresses the pin, and the pin can float backward due to the support of the spring, and the current is transmitted to the claw spring at the end of the sleeve through the pin. The claw spring and the pin are in interference contact and transmitted to the tail end of the sleeve. The tail end of the sleeve can be welded with a wire or crimped with a wire to achieve current transmission. Since the claw spring and the pin are transmitted through positive pressure, it has a high vibration resistance, so the contact piece of the utility model can be used in vibration and impact occasions.

[0029] Since the integrally rolled claw spring sleeve is integrally stamped and rolled, a smaller outer diameter size can be achieved, thereby achieving a high-density node arrangement.

[0030] The claw spring and the sleeve in the utility model are an integrated structure, which can reduce the risk of plastic deformation of the claw spring.

[0031] The beneficial effects of the utility model are as follows: the utility model has a small number of parts, is easy to assemble, has good anti-vibration performance, improves the contact reliability of the product, and is conducive to achieving high-density node arrangement. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the utility model in Example 1;

[0033] Figure 2 It is a structural cross-sectional view of the utility model in Example 1;

[0034] Figure 3 This is a schematic diagram of the assembly of the utility model and the insulator in Example 1;

[0035] Figure 4 It is a schematic diagram of the structure of the utility model in Example 2;

[0036] Figure 5 It is a structural cross-sectional view of the utility model in Example 2;

[0037] Figure 6 This is a schematic diagram of the assembly of the utility model and the insulator in Example 2;

[0038] Markings in the figure: 1, pin, 11, limit step, 12, pin chamfer, 13, root cleaning step;

[0039] 2. Spring;

[0040] 3. One-piece rolled claw spring sleeve, 31. Spring support surface, 32. Claw spring, 33. Strongly installed barbs, 34. Assembly positioning step, 35. Blocking film;

[0041] 4. Insulator. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention in any way.

[0043] The directional descriptions of “front” and “rear” in the present invention are based on the fact that when the contact of the present invention is in use, the end of the pin that contacts another contact is the “front”, and the direction opposite to the end is the “rear”.

[0044] Embodiment 1: refer to the attached Figure 1-3As shown, a claw spring structure elastic contact piece comprises a pin 1, a spring 2 and an integrally wound claw spring sleeve 3; the tail end of the pin 1 is inserted into the front end of the integrally wound claw spring sleeve 3, and a limiting step 11 is provided on the pin 1 near its front end; the spring 2 is sleeved on the pin 1, the front end of the spring 2 is pressed against the limiting step 11, and the rear end of the spring 2 is pressed against the spring supporting surface 31 of the integrally wound claw spring sleeve 3; the front end surface of the integrally wound claw spring sleeve 3 serves as the spring supporting surface The support surface 31, the side of the integrally wound claw spring sleeve 3 is provided with at least a pair of symmetrical side openings, and a claw spring 32 is arranged in the side opening, the root of the claw spring 32 and the integrally wound claw spring sleeve 3 are an integral structure, the end of the claw spring 32 extends toward the direction of the spring support surface 31, and the claw spring 32 is interference fit with the pin 1; the outer side of the integrally wound claw spring sleeve 3 is also provided with a forced barb 33, which is used for forced assembly with the insulator 4, and the forced barb 33 is stuck on the inner wall of the insulator 4 to prevent the contact piece from retreating.

[0045] Furthermore, in order to indicate that the present invention is assembled in place during the process of assembling the present invention in the insulator 4, an assembly positioning step 34 is provided at the rear of the integrally wound claw spring sleeve 3. In this embodiment, the assembly positioning step 34 is a reduced diameter section, that is, formed by a circle of inclined step surfaces. During assembly, the assembly tool cooperates with the assembly positioning step 34. When the assembly tool presses against the end surface of the insulator 4, it indicates that the contact has been assembled in place. The assembly positioning step 34 adopts an inclined surface structure to facilitate the assembly tool to push the contact to achieve forced assembly with the insulator 4. After the contact of this embodiment is forcibly installed into the insulator 4, the front end of the limiting step 11 presses against the stop surface in the insulator 4 to prevent the contact from coming out of the front end of the insulator 4.

[0046] As an option of this embodiment, the limiting step 11 is a circle of annular protrusions extending circumferentially, or the limiting step 11 is a plurality of protrusions arranged at intervals in the circumferential direction.

[0047] As an option of this embodiment, the claw springs 32 are arranged in two symmetrical groups, and a reverse bending portion is provided at the end of the claw spring 32, and the reverse bending portion is interference-fitted with the insertion pin 1.

[0048] As an option of this embodiment, the strong barbs 33 are provided in plurality and are arranged at intervals along the circumferential direction, preferably, are evenly arranged at equal intervals.

[0049] Preferably, the outer diameter of the spring 2 is not larger than the outer diameters of the limiting step 11 and the spring supporting surface 31 , so that after the contact piece is installed in the insulator 4 , the spring 2 is prevented from rubbing against the inner wall of the insulator 4 during compression, thereby ensuring smooth floating of the pin 1 .

[0050] Preferably, the tail end of the plug pin 1 is provided with a plug pin chamfer 12, which can be used to guide the plug pin 1 to be plugged and assembled with the integrally rolled claw spring sleeve 3, thereby improving the assembly efficiency.

[0051] Embodiment 2: Compared with Embodiment 1, this embodiment differs in the structure of the pin 1 and the integrally wound claw spring sleeve 3. Figure 4-6 As shown, in this embodiment, in addition to the pin chamfer 12, the tail end of the pin 1 is also provided with a root cleaning step 13 on the side of the tail end of the pin 1; a claw spring 32 that can be stuck in the root cleaning step 13 is provided at the side opening of the side of the integrally wound claw spring sleeve 3, and the claw spring 32 and the root cleaning step 13 are interference fit. Moreover, in this embodiment, the end of the claw spring extends to the rear end of the integrally wound claw spring sleeve 3 and presses on the root cleaning step 13, which can prevent the pin 1 from being inserted too deeply into the integrally wound claw spring sleeve 3, avoid affecting the floating of the pin 1, and prevent the pin 1 from being separated from the integrally wound claw spring sleeve 3 before the contact piece is installed into the insulator 4. When the pin 1 and the integrally rolled claw spring sleeve 3 are plugged in and assembled, the pin chamfer 12 can play a guiding role in the plugging. When the claw spring 32 passes over the pin chamfer 12 and enters the root clearing step 13, the claw spring 32 loses support, so that the elastic force generated by the outward expansion is released, and then the claw spring 32 shrinks inward and deforms and gets stuck on the root clearing step 13.

[0052] Furthermore, a raised assembly positioning step 34 is provided on the outer side of the integrally wound claw spring sleeve 3. When the contact is installed on the insulator 4, when the assembly positioning step 34 presses against the rear end of the insulator 4, it indicates that the contact is installed in place.

[0053] Furthermore, a blocking film 35 is provided inside the integrally rolled claw spring sleeve 3 to prevent glue from flowing back when the tail of the contact is filled with glue, thereby ensuring the floating function of the pin 1.

[0054] Other structures not described in detail are the same as those in Example 1.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can be modified or replaced by equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A claw spring structure elastic contact, comprising a pin, a spring and a sleeve, characterized in that: The sleeve is an integrally wound claw spring sleeve formed by winding a metal sheet, and one end of the integrally wound claw spring sleeve for connecting the pin is provided with a claw spring integrally formed with the sleeve, the root of the claw spring is connected to the side of the sleeve, and the claw spring is in interference contact with the connected pin; the spring is sleeved on the pin, and the two ends of the spring are respectively pressed against the pin and the integrally wound claw spring sleeve.

2. The claw spring structure elastic contact member according to claim 1, characterized in that: A side opening is provided on the side of the integrally wound claw spring sleeve, and the claw spring is located in the side opening and is bent toward the center of the integrally wound claw spring sleeve.

3. The claw spring structure elastic contact member according to claim 1, characterized in that: The claw spring is symmetrically arranged on the integrally rolled claw spring sleeve.

4. The claw spring structure elastic contact member according to claim 1, characterized in that: A plurality of strong installation barbs are arranged on the side surface of the integrally wound claw spring sleeve. When a plurality of strong installation barbs are arranged, the plurality of strong installation barbs are arranged at intervals along the circumferential direction.

5. The claw spring structure elastic contact member according to claim 1, characterized in that: The side surface of the integrally wound claw spring sleeve is also provided with an assembly positioning step, and the assembly positioning step is a reduced diameter section, or the assembly positioning step is a step block protruding from the side surface of the integrally wound claw spring sleeve.

6. The claw spring structure elastic contact member according to claim 1, characterized in that: A blocking film is also arranged in the integrally wound claw spring sleeve.

7. The claw spring structure elastic contact member according to claim 1, characterized in that: A limiting step is arranged on the insertion pin, the end surface of the end of the integrally wound claw spring sleeve is a spring supporting surface, and the two ends of the spring are respectively pressed against the limiting step and the spring supporting surface.

8. The claw spring structure elastic contact member according to claim 7, characterized in that: The limiting step is a circle of annular protrusions extending circumferentially, or the limiting step is a plurality of protrusions arranged at intervals in the circumferential direction.

9. The claw spring structure elastic contact member according to any one of claims 1 to 8, characterized in that: The tail end of the pin is provided with a pin chamfer.

10. The claw spring structure elastic contact member according to any one of claims 1 to 8, characterized in that: The tail end of the pin is provided with a pin chamfer and a root cleaning step, the root cleaning step is located in front of the pin chamfer, the end of the claw spring extends to the rear end of the integrally rolled claw spring sleeve, and is interference fit with the pin at the root cleaning step.

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