Solid fisheye terminal

Abstract

The utility model provides a solid fisheye terminal, which comprises a fixed part, a press-in part and an insertion part, the press-in part comprises two symmetrically arranged side arms and a middle part connected between the two side arms, the middle part divides the two side arms up and down to form a first groove and a second groove, and the first groove and the second groove are connected with the insertion part. The middle portion is further bent from the first groove to the second groove to form a concave portion, the top face and the bottom face of the fixing portion extend towards the first groove and the second groove to form a rear end face, the rear end face is a slope with the included angle alpha ranging from 75 degrees to 85 degrees, the top face and the bottom face of the inserting portion extend towards the first groove and the second groove to form a front end face, and the front end face is a slope with the included angle alpha ranging from 75 degrees to 85 degrees. The front end face is a slope with the included angle b ranging from 10 degrees to 30 degrees. According to the solid fisheye terminal, the strength of the two side arms is enhanced through the middle part, and the concave part bent towards the groove on one side is preset on the middle part, so that the middle part can arch to generate regular deformation when being extruded by the hole wall of the PCB, and meanwhile, the structural elasticity and strength of the press-in part can be increased, and the deformation stress of the press-in part can be more uniformly dispersed.

Description

Technical Field

[0001] The utility model belongs to the technical field related to terminals, and particularly relates to a solid fisheye terminal. Background Art

[0002] Fisheye terminals are a type of press-fit terminal. Their two springs contract when squeezed, allowing them to be inserted smoothly into the conductive holes of a circuit board, thus establishing an electrical connection. Fisheye terminals are widely used due to their ease of assembly, lack of soldering requirements, and interchangeability, as well as their ability to fit smaller conductive holes on circuit boards.

[0003] Solid fisheye terminals, as one type of fisheye terminal, can have a variety of cross-sectional shapes, with the H-shaped solid fisheye being the most widely used. In existing technology, the H-shaped press-fit portion of a conventional solid fisheye terminal is easily squeezed into a circuit board through-hole by the through-hole wall, causing irregular deformation. In severe cases, the H-shaped press-fit portion can break, affecting the electrical connection between electrical components. Summary of the Invention

[0004] The utility model provides a solid fisheye terminal, which can solve the problem that the press-in portion is squeezed by the hole wall to produce irregular deformation and even breakage.

[0005] The technical solution adopted by this utility model is:

[0006] A solid fisheye terminal comprises a fixing portion, a pressing portion and an insertion portion connected in sequence, the pressing portion comprising two symmetrically arranged side arms and an intermediate portion connected between the two side arms, the ends of the two side arms being connected to the fixing portion and the insertion portion respectively, the intermediate portion separating the two side arms from top to bottom to form a first groove and a second groove, the intermediate portion further bending from the first groove to the second groove to form a recessed portion, the recessed portion being arranged along the insertion direction of the terminal, a circle of first transition arc surfaces being formed around the top surface of the intermediate portion, a circle of second transition arc surfaces being provided around the bottom surface of the intermediate portion, the top surface and bottom surface of the fixing portion extending toward the first groove and the second groove respectively to form a rear end surface connected to the first transition arc surface and the second transition arc surface, the rear end surface being a slope with an angle a of 75°-85°, the top surface and bottom surface of the insertion portion extending toward the first groove and the second groove respectively to form a front end surface connected to the first transition arc surface and the second transition arc surface, the front end surface being a slope with an angle b of 10°-30°.

[0007] Preferably, the outer surface of the side arm includes horizontal planes at the top and bottom, a flat plane at the outside, and an arcuate plane arranged between the horizontal plane and the flat plane; the inner upper surface of the side arm located in the first groove includes a first inclined plane A, a second inclined plane B, and a third inclined plane C extending from the top of the side arm toward the first transition arcuate plane respectively, the second inclined plane B and the third inclined plane C are located on both sides of the first inclined plane A, the second inclined plane B is connected to the rear end plane, and the third inclined plane C is connected to the front end plane; the inner lower surface of the side arm located in the second groove includes a first inclined plane A', a second inclined plane B', and a third inclined plane C' extending from the bottom of the side arm toward the second transition arcuate plane respectively, the second inclined plane B' and the third inclined plane C' are located on both sides of the first inclined plane A', the second inclined plane B' is connected to the rear end plane, and the third inclined plane C' is connected to the front end plane, and the widths of the first inclined plane A', the second inclined plane B', and the third inclined plane C' are respectively greater than the widths of the corresponding first inclined plane A, the second inclined plane B, and the third inclined plane C.

[0008] Preferably, the upper surface of the middle part includes the upper surface of the recessed part and the first transition surface arranged on the left and right sides of the upper surface of the recessed part, the front and rear ends of the upper surface of the recessed part are respectively connected to the first transition arcuate surface in the first groove, and the front and rear ends and the outer side of the first transition surface are connected to the first transition arcuate surface; the lower surface of the middle part corresponds to the upper surface of the recessed part, and includes an arc-shaped lower convex surface located in the middle and a second transition surface arranged on the left and right sides of the arc-shaped lower convex surface, the front and rear ends of the arc-shaped lower convex are connected to the second transition arcuate surface in the second groove, and the front and rear ends and the outer side of the second transition surface are connected to the second transition arcuate surface.

[0009] Preferably, the upper surface of the recessed portion includes a first arcuate concave surface located in the middle, a third transition surface located on both sides of the first arcuate concave surface, a second arcuate concave surface located outside the third transition surface, and an arcuate convex surface located outside the second arcuate concave surface. The first arcuate concave surface, the third transition surface, the second arcuate concave surface, and the arcuate convex surface are all arranged along the insertion direction of the terminal, and the front and rear ends of the first arcuate concave surface, the third transition surface, the second arcuate concave surface, and the arcuate convex surface are respectively connected to the first transition arcuate surface.

[0010] Preferably, the inserting portion includes a vertical portion connected to two side arms and a pin connected to the vertical portion. The vertical portion is a rounded rectangular body, and the pin is a quadrangular pyramid with chamfered corners on all sides.

[0011] Compared with the prior art, the beneficial effects of the present invention are: the solid fisheye terminal strengthens the strength of the two side arms through the middle part, which can effectively improve the plug-in and pull-out force of the terminal, and a recessed part bent toward one side groove is preset on the middle part. When the middle part is squeezed by the PCB hole wall, it will arch and produce regular deformation, which solves the problem that the H-shaped press-in part is easily squeezed by the hole wall of the through hole to produce irregular extrusion deformation and possible breakage. At the same time, it can also increase the structural elasticity and strength of the press-in part, so that the deformation stress of the press-in part can be more dispersed and uniform; further, the front end faces of the first and second grooves are designed to be longer slopes, which improve the elasticity of the two side arms at this point and facilitate the insertion and removal of the terminal; further, the recessed part is designed to be a symmetrical recessed surface composed of multiple continuous faces, which is convenient for processing and can also enable the press-in part to maintain good structural strength during the deformation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the present utility model.

[0013] Figure 2 This is a structural diagram of the utility model from another angle.

[0014] Figure 3 for Figure 1 main view.

[0015] Figure 4 for Figure 3 AA cross-sectional view in.

[0016] Figure 5 for Figure 3 BB cross-section diagram in.

[0017] Figure 6 for Figure 1 rear view.

[0018] In the figure: 1, fixing part; 2, insertion part; 3, side arm; 4, middle part; 5, first groove; 6, second groove; 7, recessed part; 8, first transition arc surface; 9, second transition arc surface; 10, rear end surface; 11, front end surface; 2-1, vertical part; 2-2, pin; 3-1, horizontal surface; 3-2, flat surface; 3-3, arc surface; 3-4, first inclined surface A; 3-5, second inclined surface B; 3-6, third inclined surface C; 3-4', first inclined surface A'; 3-5', second inclined surface B'; 3-6', third inclined surface C'; 4-1, first transition surface; 4-2, second transition surface; 4-3, arc-shaped lower convex surface; 7-1, first arc-shaped concave surface; 7-2, third transition surface; 7-3, second arc-shaped concave surface; 7-4, arc-shaped convex surface. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual drawings. They should not be construed as limiting the present invention. It is understandable that some well-known structures and their descriptions may be omitted from the accompanying drawings.

[0020] The utility model provides a solid fisheye terminal, comprising a fixing portion 1, a pressing portion and an inserting portion 2 connected in sequence, the pressing portion comprising two symmetrically arranged side arms 3, and an intermediate portion 4 connected between the two side arms 2, the two ends of the two side arms 3 being respectively connected to the fixing portion 1 and the inserting portion 2, the intermediate portion 4 separating the two side arms 2 from each other to form a first groove 5 and a second groove 6, the intermediate portion 4 further bends from the first groove 5 to the second groove 6 to form a recessed portion 7, the recessed portion 7 being arranged along the insertion direction of the terminal, and the top surface of the intermediate portion 4 is formed around A circle of first transition arc surface 8, a circle of second transition arc surface 9 is provided around the bottom surface of the middle part 4, the top surface and the bottom surface of the fixing part 1 extend toward the first groove and the second groove respectively to form a rear end surface 10 connected to the first transition arc surface and the second transition arc surface, and the rear end surface 10 is a slope with an angle a of 75°-85°, the top surface and the bottom surface of the insertion part 2 extend toward the first groove and the second groove respectively to form a front end surface 11 connected to the first transition arc surface and the second transition arc surface, and the front end surface 11 is a slope with an angle b of 10°-30°.

[0021] Here, the middle part 4 is equivalent to an irregular inverted trapezoidal elastic supporting surface when viewed along the insertion direction. The inner sides of the two side arms 3 are connected through the middle part 4, which enhances the strength of the side arms. When the terminal is inserted into the PCB hole, there will be no insufficient insertion and extraction force. Furthermore, a recessed portion 7 bent toward one side of the groove is preset on the middle part 4. When the middle part 4 is squeezed by the PCB hole wall, it will arch and produce regular deformation, which solves the problem that the H-shaped press-in part is easily squeezed by the hole wall of the through hole to produce irregular extrusion deformation and possible fracture. At the same time, it can also increase the structural elasticity and strength of the press-in part, so that the deformation stress of the press-in part can be more dispersed and uniform.

[0022] The rear end face 10 is a slope with an angle a of 75°-85°. This slope is a transition slope connected to the rear end inner walls of the two side arms. It is composed of a central triangular slope and transition surfaces located on both sides of the triangular slope that connect to the side arms. The angle a is the slope angle of the triangular slope. The front end face 11 is a slope with an angle b of 10°-30°. This slope is a transition slope connected to the front end inner walls of the two side arms. It can be considered that the rear end face is slightly tilted outward relative to the first and second grooves, and the slope length is relatively small, while the front end face is tilted outward at a large angle relative to the first and second grooves, and the slope length is relatively long. This design takes into account that the front end face first contacts the PCB hole, which is a pre-deformation position. If the terminal thickness is thinned here, the elasticity of the two side arms at this location can be improved without affecting the strength of the two side arms, facilitating the insertion and removal of the terminal.

[0023] The terminal is inserted into the PCB hole, and the insertion portion guides the terminal insertion, and then the pressing portion gradually inserts into the PCB hole. Since the width of the two outer sides of the two side arms first increases to a certain value and then gradually decreases, and the width of the two outer sides of the middle part of the two side arms is greater than the inner diameter of the PCB hole, when the pressing portion is pressed into the PCB hole and the two side arms are initially matched with the PCB hole, its pressure value will reach a first peak, and the corresponding part of the pressure value is at the front end surface. The thickness of the middle part of the front side of the pressing portion is thinned by the two front end surfaces, which can make the two side arms shrink in advance and reduce the pressure of the PCB hole. The pressing portion gradually enters and is forced to shrink inward. At the same time, the middle part is further arched along the direction of the recessed part under force to produce regular deformation. When 90% of the area of the pressing portion is located in the PCB hole, the insertion is completed by default. Under the action of the middle part, the two side arms tend to return to their original state, and two opposite outward forces are generated on the inner wall of the PCB hole, so that the terminal is better fixed in the through hole and provides better retention. In this way, the terminal is more firm and durable when used in environments such as vibration.

[0024] Furthermore, the outer surface of the side arm 3 includes horizontal surfaces 3-1 at the top and bottom, a flat surface 3-2 on the outside, and a curved surface 3-3 located between the horizontal and flat surfaces 3-1 and 3-2. The combination of the flat and curved surfaces in the middle of the side walls creates a smooth, free-from-edge surface, effectively enhancing the stability and reliability of contact between the side arms and the inner wall of the PCB hole.

[0025] The inner upper surface of the side arm 3 located in the first groove 5 includes a first inclined surface A 3-4, a second inclined surface B 3-5, and a third inclined surface C 3-6 extending from the top of the side arm toward the first transition arc surface 8. The second inclined surface B 3-5 and the third inclined surface C 3-6 are located on both sides of the first inclined surface A 2-4 and are each formed by two inclined surfaces arranged continuously. The second inclined surface B 3-5 is connected to the rear end surface 10, and the third inclined surface C 3-6 is connected to the front end face 11; the inner lower surface of the side arm 3 located in the second groove 6 includes a first inclined surface A'3-4', a second inclined surface B'3-5', and a third inclined surface C'3-6' extending from the bottom of the side arm toward the second transition arc surface 9, the second inclined surface B'3-5' and the third inclined surface C'3-6' are located on both sides of the first inclined surface A'3-4', and are both composed of two inclined surfaces arranged continuously, the second inclined surface B'3-5' is connected to the rear end face 10, and the third inclined surface C'3-6' is connected to the front end face 11, the widths of the first inclined surface A'3-4', the second inclined surface B'3-5', and the third inclined surface C'3-6' are respectively greater than the widths of the corresponding first inclined surface A, second inclined surface B, and third inclined surface C. Simply put, the inner surfaces of both arms are designed as inclined surfaces. This design is due to the relatively thick material thickness. The strong force required to stamp the first and second grooves, resulting in high material flow, facilitates material flow and achieves relatively good stamping results. Furthermore, the recessed portion arranged along the insertion direction of the terminal is relatively long and has a certain depth. The first groove is shallow, meaning the width of the inclined wall is slightly smaller, which also facilitates stamping of the recessed portion. The second groove is deeper, taking into account the depth of the recessed portion itself and its depth after deformation.

[0026] Furthermore, the top length of the middle portion 4 located within the first groove 5 is shorter than the bottom length of the middle portion 4 located within the second groove 6, and the top width of the middle portion 4 located within the first groove 5 is wider than the bottom width of the middle portion 4 located within the second groove 6. This design allows the concave portion of the middle portion to deform more regularly in a predetermined direction when subjected to compression, and the deformed middle portion can more evenly distribute stress.

[0027] Furthermore, the upper surface of the middle portion 4 includes a recessed upper surface and first transition surfaces 4-1 disposed on the left and right sides of the recessed upper surface. The front and rear ends of the recessed upper surface are respectively connected to the first transition arcuate surface 8 in the first groove 5. The front and rear ends and the outer side of the first transition surface 4-1 are connected to the first transition arcuate surface 8. The lower surface of the middle portion 4 corresponds to the recessed upper surface and includes a central arcuate lower convex surface 4-3 and second transition surfaces 4-2 disposed on the left and right sides of the arcuate lower convex surface. The front and rear ends of the arcuate lower convex surface 4-3 are connected to the second transition arcuate surface 9 in the second groove. The front and rear ends and the outer side of the second transition surface 4-2 are connected to the second transition arcuate surface 9. This design is intended to facilitate material flow during extrusion molding and facilitate stamping molding.

[0028] Furthermore, the upper surface of the recessed portion includes a first curved concave surface 7-1 located in the middle, third transition surfaces 7-2 located on both sides of the first curved concave surface 7-1, a second curved concave surface 7-3 located outside the third transition surface 7-2, and a curved convex surface 7-4 located outside the second curved concave surface 7-3. The first curved concave surface 7-1, the third transition surface 7-2, the second curved concave surface 7-3, and the curved convex surface 7-4 are all arranged along the insertion direction of the terminal, and the front and rear ends of the first curved concave surface, the third transition surface, the second curved concave surface, and the curved convex surface are respectively connected to the first transition curved surface 8. The outer side of the curved convex surface 7-4 is connected to the first transition surface 4-1. The design of multiple connected surfaces can ensure that the press-fit portion maintains good structural strength during deformation, thereby achieving a better electrical connection effect with the circuit board. Among them, the first transition surface, the second transition surface, and the third transition surface are all inclined surfaces.

[0029] Furthermore, the insert 2 comprises a vertical portion 2-1 connected to two side arms 3, and pins 2-2 connected to the vertical portion 2-1. The vertical portion 2-1 is a rounded rectangular body, while the pins 2-2 are quadrangular pyramids with chamfered corners. The insert has a smooth, no-edge design to ensure that the PCB hole is not damaged during pre-insertion. The length of the vertical portion is not specifically limited and can be adjusted based on the space available for the assembly.

[0030] The above describes in detail the optional implementation methods of the utility model examples in conjunction with the accompanying drawings. However, the implementation methods of the utility model are not limited to the specific details in the above implementation methods. Within the technical concept of the implementation methods of the utility model, various simple modifications can be made to the technical solutions of the implementation methods of the utility model. These simple modifications all fall within the protection scope of the implementation methods of the utility model.

Claims

1. A solid fisheye terminal comprising a fixed portion, a press-in portion, and an insert portion connected in sequence, wherein the press-in portion comprises two symmetrically arranged side arms and a middle portion connected between the two side arms, wherein the ends of the two side arms are respectively connected to the fixed portion and the insert portion, characterized in that: The middle part separates the two side arms up and down to form a first groove and a second groove, and the middle part is further bent from the first groove to the second groove to form a recessed part, and the recessed part is arranged along the insertion direction of the terminal. A circle of first transition arc surfaces is formed around the top surface of the middle part, and a circle of second transition arc surfaces is provided around the bottom surface of the middle part. The top surface and the bottom surface of the fixing part extend toward the first groove and the second groove respectively to form a rear end surface connected to the first transition arc surface and the second transition arc surface, and the rear end surface is a slope with an angle a of 75°-85°, and the top surface and the bottom surface of the insertion part extend toward the first groove and the second groove respectively to form a front end surface connected to the first transition arc surface and the second transition arc surface, and the front end surface is a slope with an angle b of 10°-30°.

2. The solid fisheye terminal according to claim 1, characterized in that: The outer surface of the side arm includes horizontal surfaces at the top and bottom, a flat surface at the outside, and an arcuate surface arranged between the horizontal surface and the flat surface; the inner upper surface of the side arm located in the first groove includes a first inclined surface A, a second inclined surface B, and a third inclined surface C extending from the top of the side arm toward the first transition arcuate surface respectively, the second inclined surface B and the third inclined surface C are located on both sides of the first inclined surface A, the second inclined surface B is connected to the rear end surface, and the third inclined surface C is connected to the front end surface; the inner lower surface of the side arm located in the second groove includes a first inclined surface A', a second inclined surface B', and a third inclined surface C' extending from the bottom of the side arm toward the second transition arcuate surface respectively, the second inclined surface B' and the third inclined surface C' are located on both sides of the first inclined surface A', the second inclined surface B' is connected to the rear end surface, and the third inclined surface C' is connected to the front end surface, and the widths of the first inclined surface A', the second inclined surface B', and the third inclined surface C' are respectively greater than the widths of the corresponding first inclined surface A, the second inclined surface B, and the third inclined surface C.

3. The solid fisheye terminal according to claim 1, characterized in that: The upper surface of the middle part includes the upper surface of the recessed part and the first transition surface arranged on the left and right sides of the upper surface of the recessed part, the front and rear ends of the upper surface of the recessed part are respectively connected to the first transition arcuate surface in the first groove, and the front and rear ends and the outer side of the first transition surface are connected to the first transition arcuate surface; the lower surface of the middle part corresponds to the upper surface of the recessed part, and includes an arc-shaped lower convex surface located in the middle and a second transition surface arranged on the left and right sides of the arc-shaped lower convex surface, the front and rear ends of the arc-shaped lower convex are connected to the second transition arcuate surface in the second groove, and the front and rear ends and the outer side of the second transition surface are connected to the second transition arcuate surface.

4. The solid fisheye terminal according to claim 1, characterized in that: The upper surface of the recessed portion includes a first arc-shaped concave surface located in the middle, a third transition surface located on both sides of the first arc-shaped concave surface, a second arc-shaped concave surface located outside the third transition surface, and an arc-shaped convex surface located outside the second arc-shaped concave surface. The first arc-shaped concave surface, the third transition surface, the second arc-shaped concave surface, and the arc-shaped convex surface are all arranged along the insertion direction of the terminal, and the front and rear ends of the first arc-shaped concave surface, the third transition surface, the second arc-shaped concave surface, and the arc-shaped convex surface are respectively connected to the first transition arc-shaped surface.

5. The solid fisheye terminal according to claim 1, characterized in that: The inserting portion includes a vertical portion connected to two side arms and a pin connected to the vertical portion. The vertical portion is a rounded rectangular body, and the pin is a quadrangular pyramid with chamfered corners on all sides.

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