CN109586061B

CN109586061B - Electrical connector

Info

Publication number: CN109586061B
Application number: CN201811232780.7A
Authority: CN
Inventors: 方飞龙
Original assignee: Lotes Guangzhou Co Ltd
Current assignee: Lotes Guangzhou Co Ltd
Priority date: 2018-10-23
Filing date: 2018-10-23
Publication date: 2021-04-23
Anticipated expiration: 2038-10-23
Also published as: CN109586061A

Abstract

The invention discloses an electric connector, which is arranged on a circuit board with a through hole and comprises a body, a first connecting piece and a second connecting piece, wherein the body is arranged on the circuit board; at least one fixed holding piece, which comprises a base fixed on the body, an elastic arm connected with the lower end of the base and accommodated in the through hole, and a buckling part connected with the lower end of the elastic arm, wherein the elastic arm is made of thermal bimetal, it includes an active layer and a passive layer which are mutually jointed, the thermal expansion rate of the active layer is greater than that of the passive layer, the buckling part is projected from the direction of the active layer to the passive layer, the elastic arm is heated and bent towards the passive layer, so that the buckling part buckles the circuit board, the elastic arm includes a first arm which is deviated from the base part and extends downwards in an inclined way, a second arm which extends oppositely relative to the first arm and is inclined downwards and a first bending part which connects the first arm and the second arm, the length and the elasticity of the elastic arm are increased, when the elastic arm is heated and then is bent towards the passive layer, large bending deformation can be generated to enable the buckling part to buckle the circuit board stably, and the body is prevented from being heated and deformed in a warping mode.

Description

Electrical connector

Technical Field

The present invention relates to an electrical connector, and more particularly, to an electrical connector with a deformable retainer.

Background

In the prior art, most of the electrical connectors need to weld the conductive terminals to the circuit board, and during the welding process, the electrical connector needs to be subjected to high temperature, and the insulating body of the electrical connector is easy to warp and deform due to thermal expansion. Chinese patent application No. 201710750719.0 discloses an electrical connector, which has an insulative housing and a plurality of conductive terminals disposed on the insulative housing, wherein two ends of the insulative housing are provided with first fixing devices, and a second fixing device is disposed in the middle of the insulative housing, wherein the second fixing device is made of thermal bimetal, and can be actively bent and deformed by heating, and includes a second fixing portion fixed in the insulative housing, a second elastic arm connected below the second fixing portion and inserted into a circuit board, and a second bending portion located at the end of the second elastic arm, wherein the second elastic arm is deformed by heating to drive the second bending portion to buckle the circuit board; the first fixing device and the second fixing device are similar in structure, but are made of common metal, can not be bent by heating, and are provided with first bending parts for buckling the circuit board, the first bending parts do not buckle the circuit board before heating, and when the insulating body is warped by heating, the insulating body drives the first fixing device to move so that the first bending parts buckle the circuit board, and the insulating body is prevented from being excessively warped by further heating. When the environmental temperature rises, the first and second fixing devices can clamp the circuit board, additionally increasing the fixing force at the two ends and the middle of the insulating body, and avoiding the excessive warping deformation of the insulating body.

The second elastic arm is in a vertical flat plate shape before being deformed by heat, so as to avoid the influence on other electronic elements caused by the fact that the second elastic arm extends beyond the circuit board too much, most of the second elastic arm is accommodated in the through hole of the circuit board, the length of the second elastic arm is limited by the thickness of the circuit board and does not have enough elasticity, so that enough deformation cannot occur, the bending amplitude of the second elastic arm is small, the buckling strength of the second bending part on the circuit board is insufficient, and the fixing effect is influenced.

Therefore, there is a need for an improved electrical connector that overcomes the above problems.

Disclosure of Invention

In view of the problems faced by the background art, the present invention provides an electrical connector with a holding member that is bent and extended and capable of deforming under heat.

In order to achieve the purpose, the invention adopts the following technical means:

an electrical connector mounted to a circuit board having at least one through hole, comprising: the body is arranged on the circuit board; at least one fixing piece, which comprises a base fixed on the body, an elastic arm connected to the lower end of the base and contained in the through hole, and a buckling part connected to the lower end of the elastic arm, wherein the elastic arm is made of thermal bimetal and comprises an active layer and a passive layer which are mutually attached, the thermal expansion rate of the active layer is greater than that of the passive layer, the buckling part is protruded from the direction of the active layer pointing to the passive layer, the elastic arm is heated to be bent towards the passive layer, so that the buckling part buckles the circuit board, and the elastic arm comprises a first arm which deviates from the base and obliquely extends downwards, a second arm which oppositely extends relative to the first arm and obliquely downwards, and a first bending part which connects the first arm and the second arm.

Furthermore, the elastic arm is also provided with a third arm which extends oppositely relative to the second arm and inclines downwards and a second bent part which connects the second arm and the third arm.

Furthermore, the elastic arm is provided with a fourth arm vertically extending from the lower end of the third arm, and the lower end of the fourth arm is connected with the buckling part.

Furthermore, the buckling part comprises a flat plate part, the upper end of the flat plate part is connected with the elastic arm, a hook part is formed by bending and extending at least one side of the flat plate part, and the hook part and the second bending part are positioned on the same side of the plane of the flat plate part in the horizontal direction.

Further, the first bending part and the second bending part are contained in the through hole and have gaps with the circuit board in the horizontal direction respectively.

Further, the base portion is in the shape of a vertical flat plate, and the first bending portion and the second bending portion are located on two opposite sides of a plane where the base portion is located respectively.

Furthermore, the buckling part comprises a flat plate part, the upper end of the flat plate part is connected with the elastic arm, and the elastic arm is bent and extended from at least one side of the flat plate part to form a hook part for buckling the bottom surface of the circuit board.

Furthermore, two sides of the flat plate part are bent and extended to form two hook parts, and the two hook parts are symmetrically arranged.

Further, the upper edge of the hook part is provided with a meshing edge in a saw-toothed shape.

Further, the engaging edge is obliquely arranged from top to bottom along the extending direction of the hook part.

Further, the holder is integrally made of thermal bimetal.

Furthermore, the body is sunken to be provided with a slot extending lengthwise for inserting an electronic card, a foolproof key is arranged in the slot, two mounting parts are formed by upwards protruding two lengthwise ends of the slot of the body, each mounting part is pivoted with an ear buckle for locking the electronic card, three mounting holes are sunken in the bottom of the body, two mounting holes are respectively and correspondingly located below the two mounting parts, the other mounting hole is located below the foolproof key, and each mounting hole accommodates one fixing piece.

Compared with the prior art, the invention has the following beneficial effects: the elastic arm is accommodated in the through hole of the circuit board, bent and extended and made of thermal bimetal and comprises an active layer and a passive layer which are mutually attached, wherein the thermal expansion rate of the active layer is greater than that of the passive layer, the elastic arm is also provided with a first arm which is deviated from the base part and extends obliquely downwards, a second arm which extends reversely relative to the first arm and extends obliquely downwards and a first bent part which is connected with the first arm and the second arm, the length and the elasticity of the elastic arm are increased, when the elastic arm is bent towards the passive layer after being heated, larger bending deformation can be generated in the thickness of the limited circuit board so as to enable the buckling part to buckle the circuit board stably, the buckling effect of the fixing piece for buckling the circuit board is enhanced, and the body is fixedly attached to the flat circuit board, the body is prevented from generating obvious warping deformation in the heating process.

A holder for holding a first device and a second device, the first device having a through hole, comprising: a base for holding the second device; the elastic arm is connected to the lower end of the base and is accommodated in the through hole, and the elastic arm comprises a first arm which deviates from the base and extends obliquely downwards, a second arm which extends oppositely relative to the first arm and extends obliquely downwards and a first bending part which is connected with the first arm and the second arm; the buckling part is connected to the lower end of the elastic arm; the elastic arm is made of thermal bimetal and comprises an active layer and a passive layer which are mutually attached, the thermal expansion rate of the active layer is greater than that of the passive layer, and the elastic arm is heated to bend towards the passive layer, so that the buckling part buckles the first device.

Further, the base, the elastic arm and the fastener are integrally formed, and the fixing piece is made of thermal bimetal.

Furthermore, the buckling part comprises a flat plate part which is vertically arranged, the upper end of the flat plate part is connected with the elastic arm, the elastic arm is bent and extended from two sides of the flat plate part to form a hook part, and the hook part and the second bending part are located on the same side of the plane where the flat plate part is located in the horizontal direction.

Compared with the prior art, the invention has the following beneficial effects: the elastic arm is accommodated in the through hole of the first device, bent and extended and made of thermal bimetal and comprises an active layer and a passive layer which are mutually attached, wherein the thermal expansion rate of the active layer is greater than that of the passive layer, the elastic arm is also provided with a first arm which is deviated from the base part and extends obliquely downwards, a second arm which extends reversely relative to the first arm and extends obliquely downwards and a first bent part which is connected with the first arm and the second arm, the length and the elasticity of the elastic arm are increased, when the elastic arm is bent towards the passive layer after being heated, larger bending deformation can be generated in the limited thickness of the first device so as to enable the buckling part to buckle the circuit board stably, the buckling effect of the fixing piece for buckling the circuit board is enhanced, and the body is fixedly attached to the flat circuit board, the body is prevented from generating obvious warping deformation in the heating process.

[ description of the drawings ]

FIG. 1 is a perspective view of an electrical connector of the present invention and an electronic card and a circuit board mated therewith;

fig. 2 is an exploded view of the electrical connector of fig. 1;

FIG. 3 is an inverted perspective view of the electrical connector of FIG. 1;

fig. 4 is a perspective view of a retainer of the electrical connector of fig. 2;

FIG. 5 is a partial cross-sectional view of the electrical connector of FIG. 1;

FIG. 6 is another partial cross-sectional view of the electrical connector of FIG. 1;

fig. 7 is a schematic view of the holder in fig. 6 deformed by heat.

Detailed description of the embodiments reference is made to the accompanying drawings in which:

electrical connector 100	Body 1	Card slot 11	Fool-proof key 111
				Mounting part 12	Terminal groove 13	Mounting hole 14	Positioning groove 141
Ear clip 2	Terminal 3	Holder 4	Base 41
				Spurs 411	Positioning part 412	Connecting part 413	Elastic arm 42
First arm 421	Second arm 422	The first bent portion 423	Third arm 424
				A second bent part 425	Fourth arm 426	First bent portion 427	Second bent portion 428
Latch 43	Flat plate part 431	Hook 432	Engaging edge 4321
				Active layer 4a	Passive layer 4b	Circuit board A	Through hole A1
Electronic card B

[ detailed description ] embodiments

For a better understanding of the objects, structure, features, and functions of the invention, reference should be made to the drawings and detailed description that follow.

Referring to fig. 1 to 3, an electrical connector 100 according to the present invention is soldered to a first device, which is a circuit board a having three through holes a 1. The electrical connector 100 includes a body 1 extending lengthwise, two ear buckles 2 assembled at two ends of the body 1, a plurality of conductive terminals 3 disposed on the body 1, and three retainers 4 mounted at the bottom of the body 1. The holding member 4 can be held in a second device, which can be the body 1 accommodating the conductive terminals 3, or other electrical components or non-electrical components. In other embodiments, the electrical connector 100 may be provided with only one holder 4.

As shown in fig. 1 and 2, the body 1 is made of an insulating material and is mounted on the circuit board a. The body 1 is recessed with a lengthwise extending card slot 11 for inserting an electronic card B, and the card slot 11 is provided with a fool-proof key 111 therein, so that the card slot 11 is divided into two parts with different lengths. The body 1 is formed by extending two mounting parts 12 upwards at two lengthwise ends of the card slot 11, and the ear buckles 2 are respectively pivoted to the corresponding mounting parts 12 for locking the electronic card B. The electrical connector 100 further includes a plurality of terminal grooves 13 arranged on both sides of the card insertion groove 11 in a transverse direction perpendicular to the longitudinal direction.

As shown in fig. 1 and 2, each of the conductive terminals 3 is fixed to the corresponding terminal slot 13 and partially extends into the card slot 11 to contact the electronic card B, and partially protrudes out of the bottom of the body 1 to be soldered to the circuit board a, so as to electrically connect the electronic card B and the circuit board a.

As shown in fig. 3, three mounting holes 14 are recessed in the bottom of the body 1, two of the mounting holes 14 are respectively located below the two mounting portions 12, another mounting hole 14 is located below the fool-proof key 111, and each mounting hole 14 correspondingly receives one of the retainers 4.

As shown in fig. 5, two positioning grooves 141 extending upward are formed at both sides of the mounting hole 14.

As shown in fig. 4, the holder 4 includes a base 41 in a vertical flat plate shape, an elastic arm 42 connected to a lower end of the base 41, and a locking portion 43 connected to a lower end of the elastic arm 42.

As shown in fig. 5, the base 41 is received in the mounting hole 14, two protruding spines 411 are formed by protruding two side edges of the base 41 to interfere with the body 1, two positioning portions 412 are formed by protruding the base 41 upward to be received in the two positioning slots 141, and the fixing member 4 plays a role of positioning and guiding in the bottom-up assembly process.

As shown in fig. 4, the base 41 further has two connecting portions 413 protruding downward for connecting an adhesive tape (not shown) during the process of manufacturing the retainers 4 by stamping, the retainers 4 are connected to the adhesive tape through the connecting portions 413, and the retainers 4 are mounted to the mounting holes 14 through the adhesive tape, and are broken off and removed after mounting.

As shown in fig. 4 and 6, the elastic arm 42 extends downward from the base 41 and protrudes into the through hole a1, and the elastic arm 42 includes a first arm 421 extending obliquely downward from the base 41 at the lower end of the base 41, a second arm 422 extending oppositely to the first arm 421 and obliquely downward, a first bent portion 423 connecting the first arm 421 and the second arm 422, a third arm 424 extending oppositely to the second arm 422 and obliquely downward, a second bent portion 425 connecting the second arm 422 and the third arm 424, and a fourth arm 426 extending vertically downward at the lower end of the third arm 424. The first bent portion 423 and the second bent portion 425 are both accommodated in the through hole a1, and have a gap with the circuit board a in the horizontal direction. In this embodiment, the base 41, the elastic arm 42 and the locking portion 43 are integrally formed. The resilient arm 42 further has a first bent portion 427 connecting the first arm 421 and the base 41 and a second bent portion 428 connecting the third arm 424 and the fourth arm 426.

As shown in fig. 4, 6 and 7, the latching portion 43 is connected to the lower end of the fourth arm 426 and protrudes downward beyond the through hole a1, the latching portion 43 has a flat plate portion 431, the upper end of the flat plate portion 431 is connected to the fourth arm 426, two sides of the flat plate portion 431 are bent and extended to form two symmetrical hook portions 432 for latching the bottom surface of the circuit board a, and the hook portions 432 and the second bent portion 425 are located on the same side of the plane of the flat plate portion 431 in the horizontal direction. The upper edge of hook portion 432 has a meshing edge 4321 that is the cockscomb structure, meshing edge 4321 follows hook portion 432's extending direction from top to bottom slope sets up, meshing edge 4321 slope sets up makes it be closer to through-hole A1's border, is changeed in the buckle circuit board A, is the cockscomb structure and has then increased hook portion 432 is to circuit board A's frictional force. In other embodiments, only one side of the flat plate portion 431 is bent and extended to form the hook portion 432, so that the purpose of fastening the circuit board a can be achieved.

As shown in fig. 4, the holder 4 is made of thermal bimetal and includes an active layer 4a and a passive layer 4b attached to each other, wherein the thermal expansion rate of the active layer 4a is greater than that of the passive layer 4b, and the extending direction of the hook portion 432 is directed from the active layer 4a to the passive layer 4 b. The whole fixing piece 4 is made of thermal bimetal, so that the fixing piece 4 is conveniently formed by integrally punching a single thermal bimetal plate. Further, the hook portion 432 and the second bent portion 425 are located on the same side of the plane where the flat plate portion 431 is located in the horizontal direction, and thus the elastic arm 42 can be more easily bent in the extending direction of the hook portion 432.

As shown in fig. 1 and 6, in the process of mounting the electrical connector 100 downward on the circuit board a, the plurality of conductive terminals 3 move toward a plurality of conductive sheets (not numbered) on the circuit board a, when the body 1 is attached to the circuit board a, each conductive terminal 3 is placed on the corresponding conductive sheet, the elastic arm 42 is inserted downward into the through hole a1 from above the circuit board a, and the elastic arm 42 does not interfere with the circuit board a.

As shown in fig. 2 and 7, the electrical connector 100 is placed in a reflow furnace (not shown) together with the circuit board a, and the conductive terminals 3 are soldered to the circuit board a by heating the reflow furnace. In the process of heat welding, the temperature rises, and since the thermal expansion amount of the active layer 4a is greater than that of the passive layer 4b, the elastic arm 42 bends and deforms toward the passive layer 4b, that is, the protruding direction of the hook part 432, and drives the hook part 432 to move toward the boundary corresponding to the through hole a1, so that the engagement edge 4321 abuts against the circuit board a. On the other hand, because the body 1 extends lengthwise, and the two mounting parts 12 located at the two lengthwise ends of the body 1 and the fool-proof key 111 located in the middle of the body 1 are not provided with the conductive terminals 3, the body 1 is easily warped and deformed at these parts when subjected to high temperature, and the holding pieces 4 mounted at these parts are just buckled on the circuit board a due to high-temperature deformation, so that an additional holding effect is generated between the body 1 and the flat circuit board a, and the warped deformation of the body 1 and the empty welding phenomenon of the conductive terminals 3 caused by the warped deformation of the body 1 are avoided.

The electric connector of the invention has the following beneficial effects:

1. the elastic arm 42 is made of thermal bimetal and comprises an active layer 4a and a passive layer 4b attached to each other, wherein the thermal expansion rate of the active layer 4a is greater than that of the passive layer 4b, the elastic arm further comprises a first arm 421 extending obliquely downward from the base 41 at the lower end of the base 41, a second arm 422 extending oppositely to the first arm 421 and obliquely downward, a first bent portion 423 connecting the first arm 421 and the second arm 422, a third arm 424 extending oppositely to the second arm 422 and obliquely downward and a second bent portion 425 connecting the second arm 422 and the third arm 424, and a fourth arm 426 extending vertically downward at the lower end of the third arm 424, so that the length and elasticity of the elastic arm 42 are increased, and the passive layer 4b is heated after the elastic arm 42 is bent, the buckling part 43 can be buckled with the circuit board A stably due to the fact that large bending deformation can be generated in the limited thickness of the circuit board A, the buckling effect of the fixing piece 4 for buckling the circuit board A is enhanced, the body 1 is fixed on the flat circuit board A in a fitting mode, and the body 1 is prevented from being subjected to obvious buckling deformation in the heating process.

2. The first bent portion 423 and the second bent portion 425 maintain a certain gap from the circuit board a, and provide a space for deformation of the elastic arm 42.

3. The engagement edge 4321 is serrated, which increases the friction between the engagement edge 4321 and the circuit board a, and further enhances the holding effect of the holder 4.

The above detailed description is only for the purpose of illustrating the preferred embodiments of the present invention, and not for the purpose of limiting the scope of the present invention, therefore, all technical changes that can be made by applying the present specification and drawings are included in the scope of the present invention.

Claims

1. An electrical connector mounted to a circuit board having at least one through hole, comprising:

the body is arranged on the circuit board;

at least one fixing piece, including being fixed in a basal portion of body, connect in the lower extreme of basal portion and accept in a bullet arm of through-hole and connect in a buckle portion of the lower extreme of bullet arm, bullet arm is made by hot bimetal, and it includes an initiative layer and a passive layer of laminating each other, wherein the thermal expansion rate on initiative layer is greater than the thermal expansion rate on passive layer, buckle portion by the initiative layer points to protruding the stretching in the direction on passive layer, bullet arm is heated to the passive layer is buckled, makes buckle portion buckle hold the circuit board, its characterized in that: the elastic arm comprises a first arm which deviates from the base and extends obliquely downwards, a second arm which extends oppositely relative to the first arm and extends obliquely downwards, and a first bent part which connects the first arm and the second arm, and the elastic arm does not interfere with the circuit board in the process of being inserted into the through hole.

2. The electrical connector of claim 1, wherein: the elastic arm is also provided with a third arm which extends oppositely relative to the second arm and inclines downwards and a second bending part which connects the second arm and the third arm.

3. The electrical connector of claim 2, wherein: the elastic arm is provided with a fourth arm vertically extending from the lower end of the third arm, and the lower end of the fourth arm is connected with the buckling part.

4. The electrical connector of claim 3, wherein: the buckling part comprises a flat plate part, the upper end of the flat plate part is connected with the elastic arm, a hook part is formed by bending and extending at least one side of the flat plate part, and the hook part and the second bending part are positioned on the same side of the plane of the flat plate part in the horizontal direction.

5. The electrical connector of claim 2, wherein: the first bending part and the second bending part are contained in the through hole and have gaps with the circuit board in the horizontal direction respectively.

6. The electrical connector of claim 2, wherein: the base part is in a vertical flat plate shape, and the first bending part and the second bending part are respectively positioned on two opposite sides of the plane where the base part is positioned.

7. The electrical connector of claim 1, wherein: the buckling part comprises a flat plate part, the upper end of the flat plate part is connected with the elastic arm, and the elastic arm is bent and extended from at least one side of the flat plate part to form a hook part for buckling the bottom surface of the circuit board.

8. The electrical connector of claim 7, wherein: two sides of the flat plate part are bent and extended to form two hook parts, and the two hook parts are symmetrically arranged.

9. The electrical connector of claim 7, wherein: the upper edge of the hook part is provided with a serrated engaging edge.

10. The electrical connector of claim 9, wherein: the engaging edge is arranged along the extending direction of the hook part in an inclined manner from top to bottom.

11. The electrical connector of claim 1, wherein: the holder is entirely made of thermal bimetal.

12. The electrical connector of claim 1, wherein: the electronic card connector comprises a body, and is characterized in that a slot extending lengthwise is formed in the body in a sunken mode for inserting an electronic card, a fool-proof key is arranged in the slot, two mounting parts are formed in the lengthwise two ends of the slot by protruding upwards, each mounting part is pivoted with an ear buckle for locking the electronic card, three mounting holes are formed in the bottom of the body in a sunken mode, the two mounting holes are correspondingly located below the two mounting parts, the other mounting hole is located below the fool-proof key, and each mounting hole accommodates one fixing piece.

13. A holder for holding a first device and a second device, the first device having a through hole, comprising:

a base for holding the second device;

the elastic arm is connected with the lower end of the base part and is accommodated in the through hole;

the buckling part is connected to the lower end of the elastic arm;

the elastic arm is made of thermal bimetal and comprises an active layer and a passive layer which are mutually attached, the thermal expansion rate of the active layer is greater than that of the passive layer, and the elastic arm is heated to bend towards the passive layer so that the buckling part buckles the first device;

the method is characterized in that: the elastic arm comprises a first arm which deviates from the base and extends obliquely downwards, a second arm which extends oppositely relative to the first arm and extends obliquely downwards, and a first bent part which connects the first arm and the second arm, and the elastic arm does not interfere with the first device in the process of being inserted into the through hole.

14. The holder of claim 13, wherein: the base part, the elastic arm and the buckling part are integrally formed, and the fixing piece is made of thermal bimetal.

15. The holder of claim 13, wherein: the elastic arm is also provided with a third arm which extends oppositely relative to the second arm and inclines downwards and a second bending part which connects the second arm and the third arm.

16. The holder of claim 15, wherein: the base part is in a vertical flat plate shape, and the first bending part and the second bending part are respectively positioned on two opposite sides of the plane where the base part is positioned.

17. The holder of claim 15, wherein: the buckling part comprises a flat plate part which is vertically arranged, the upper end of the flat plate part is connected with the elastic arm, the elastic arm is bent and extended from two sides of the flat plate part to form a hook part, and the hook part and the second bending part are located on the same side of the plane where the flat plate part is located in the horizontal direction.