A fuse holder with a wrap-around pin

Abstract

This utility model relates to a fuse holder with a wrap-around pin, comprising a holder body with three sockets, each socket containing a pin. Each pin includes a wrap-around cylindrical tube, a square ring seat, and a connecting terminal. The wrap-around cylindrical tube and the square ring seat are integrally connected by a connecting piece, and the connecting terminal is integrally formed at the end of the square ring seat. The wrap-around cylindrical tube wraps around the end post of the fuse box, providing stable clamping; the square ring seat has a clearance fit with a square receiving hole in the socket to prevent the pin from rotating; the square ring seat has an elastic retaining plate that abuts against a stop block in the socket to prevent the pin from dislodging forward; the limiting step in the socket abuts against the flared section at the rear end of the wrap-around cylindrical tube to prevent the pin from dislodging backward. The connecting terminal has a raised strip to improve the reliability of the electrical connection. This utility model, through optimization of the pin structure, effectively solves the problems of unstable terminal connection and easy loosening in existing fuse holders, and has the advantages of compact structure, reliable connection, and convenient assembly.

Description

Technical Field

[0001] This utility model relates to the field of electrical connector technology, and in particular to a fuse holder with a wrap-around pin. Background Technology

[0002] A fuse holder is an essential component in a circuit for assembling with a housing that holds fuses. Existing fuse holders (such as those shown in this utility model patent publication number CN216015268U) typically include a socket terminal assembly within the holder for forming an electrical connection with the positive and negative terminals on the housing.

[0003] In practical applications, the structure of the aforementioned socket terminal assembly (i.e., pins) is relatively simple, mostly consisting of a single sheet or columnar structure. This traditional pin structure has the following shortcomings when mating with the terminal posts (positive and negative) of the fuse box: First, the contact area between the pin and the terminal post is limited, mostly point or line contact, resulting in insufficient clamping force and poor connection stability. This can easily lead to loosening and poor contact after vehicle vibration or prolonged use, affecting circuit reliability. Second, the traditional pin's mounting and positioning method within the fuse holder is unreliable, prone to rotation or axial movement, further exacerbating the risk of poor contact. Finally, the connection structure between the tail end (connecting terminal) of the traditional pin and the circuit board is not optimized, and the holding force after soldering or insertion needs improvement. Therefore, it is necessary to improve the pin structure within the fuse holder to enhance the stability of the connection and the reliability of conductivity. Utility Model Content

[0004] This invention proposes a fuse holder with a wrap-around pin, which solves the aforementioned problems existing in the use of the prior art.

[0005] The technical solution of this utility model is implemented as follows: A fuse holder with a wrapped pin includes a base body. The base body has at least two insertion ports extending through its front and rear sides from left to right. Each insertion port is fitted with a pin. The pin includes a wrapped cylindrical tube, a square ring seat, and a connecting terminal. A connecting piece is integrally formed between the wrapped cylindrical tube and the upper side of the square ring seat. The connecting terminal is integrally formed on the end of the square ring seat away from the wrapped cylindrical tube. The wrapped cylindrical tube and the square ring seat are fixedly disposed in the insertion port. The connecting terminal is located on the front side of the base body.

[0006] Preferably, the insertion port includes a square receiving hole, a limiting groove located on the upper side of the square receiving hole, and a circular opening located at the rear end of the square receiving hole. The square receiving hole is used to accommodate the wrapping tube and the square ring seat. The square ring seat is fitted into the square receiving hole with a clearance. The seat body has a stop block integrally formed on the front side of the limiting groove. The square ring seat has a retaining plate integrally formed on the upper side. When the retaining plate is located in the limiting groove, its front side abuts against the stop block. There is a limiting step between the square receiving hole and the circular opening. The limiting step is used to abut against the rear end of the wrapping tube. The circular opening communicates with the internal space of the wrapping tube.

[0007] Preferably, the card plate is formed by cutting and bending the upper part of the square ring seat upwards, and the rear end of the card plate is connected to the square ring seat, while the front end is inclined upwards.

[0008] Preferably, the lower side of the wrapping tube has a deformation slit extending axially from front to back, and the deformation slit penetrates into the internal space of the wrapping tube.

[0009] Preferably, the connecting terminal is integrally formed on one side wall of the end of the square ring seat, bends from one side of the square ring seat toward the middle of the square ring seat and then extends forward, the forward-extending part of the connecting terminal has a raised strip protruding to one side, and the connecting terminal has a corresponding stamped notch on the other side of the raised strip.

[0010] Preferably, the rear end of the wrapping tube includes an outwardly expanding flared section, which is used to abut against the limiting step, and the seat has an insertion chamfer on the circular opening.

[0011] Preferably, the lower side of the square ring seat has a closing gap, and the wrapping round tube, the square ring seat, the connecting piece and the connecting terminal are all formed from the same piece of plate by cutting and bending.

[0012] Preferably, three sockets are provided on the base, and a positioning port is provided between each adjacent socket.

[0013] Preferably, the side wall of the base has a plurality of forward-extending mounting posts integrally formed thereon.

[0014] Preferably, the front end of the mounting column is integrally formed with a conical frustum, the conical frustum is necked from back to front, the conical frustum has deformation openings on both sides that extend through the side walls of the conical frustum, and the conical frustum has reinforcing blocks arranged facing each other on the inner walls on both sides of the deformation openings.

[0015] In summary, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model, by setting up a wrapping round tube, can form a circumferential wrapping contact with the positive and negative terminals of the fuse box when plugged in, which significantly increases the contact area, thereby providing a stable and reliable clamping force, effectively preventing the terminals from loosening or falling off, and ensuring the reliability of the circuit connection; the design of the square ring seat facilitates the matching with the square hole in the socket, and plays a role in preventing rotation and positioning; the integrated molding structure of the wrapping round tube, square ring seat, connecting piece and connecting terminal not only simplifies the manufacturing process and reduces costs, but also ensures the consistency of the overall structural strength and conductivity of the pin.

[0017] 2. When the pin is installed in the socket, the clearance fit between the square receiving hole and the square ring seat effectively restricts the circumferential rotation of the pin within the socket; the contact fit between the retaining plate and the front stop of the limiting groove restricts the forward displacement of the pin (i.e., towards the connecting terminal); simultaneously, the contact of the limiting step with the rear end of the encasing round tube restricts the backward displacement of the pin (i.e., towards the round opening). These structures together constitute a bidirectional axial limiting and circumferential anti-rotation structure for the pin within the socket, ensuring that the pin is securely and accurately installed in the socket, preventing pin position displacement due to vibration or insertion / removal force, and significantly improving the long-term stability of the product.

[0018] 3. The clamping plate is integrally formed with the square ring seat using a cutting and upward bending process, eliminating the need for additional parts. This simple process results in low cost. The upward-sloping design of the clamping plate's front end allows it to be naturally pressed down (elastic deformation) by the upper wall of the limiting groove as the pin is pushed into the socket from front to back. Once the clamping plate is fully inserted into the limiting groove, its front end elastically resets and tilts upward, effectively resisting the stop block. This structure achieves "one-way locking" of the pin, ensuring smooth installation and preventing it from easily coming out later, greatly improving assembly efficiency and reliability.

[0019] 4. The design of the embossed strip and stamped notch on the connecting terminal is essentially to form a locally raised contact point or reinforcing rib on the connecting terminal. When the connecting terminal is soldered to the circuit board or plugged into the mating terminal, the protrusion can increase the contact pressure and obtain better electrical connection performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure when observed from another angle;

[0023] Figure 3 This is a front view of the present invention;

[0024] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0025] Figure 5 This is a three-dimensional structural diagram of the pin in this utility model;

[0026] Figure 6 for Figure 5 A schematic diagram of the structure when observed from another angle;

[0027] Figure 7 This is a structural diagram showing the installation of this utility model with a fuse box.

[0028] In the diagram: 1. Base; 11. Socket; 12. Square receiving hole; 13. Limiting groove; 14. Circular opening; 15. Stop block; 16. Limiting step; 17. Insertion chamfer; 18. Positioning port; 2. Mounting post; 21. Conical frustum; 22. Deformation opening; 23. Reinforcing block; 3. Pin; 31. Wrapping round tube; 311. Deformation gap; 312. Flared section; 32. Square ring seat; 321. Clamping plate; 322. Closing gap; 33. Connecting terminal; 331. Embossed strip; 332. Stamped notch; 34. Connecting piece. Detailed Implementation

[0029] The following will refer to the appendix in the embodiments of this utility model. Figure 1-7 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Example:

[0031] like Figures 1 to 5As shown, this utility model discloses a fuse holder with a wrap-around pin, which is mainly used in circuit systems for mounting to a fuse box and achieving a stable electrical connection with the circuit board. The fuse holder includes a base 1 made of insulating material, which is generally rectangular in shape. At least two, and preferably three, insertion slots 11 extending through the front and rear sides of the base 1 are sequentially formed on the base 1 from left to right (i.e., along the length of the base 1). These insertion slots 11 are used to receive and position the pins 3, which will be described later, and also for connecting to an external fuse box (such as...). Figure 7 Insert the positive and negative end posts (as shown).

[0032] To accommodate the bidirectional insertion of the fuse box, the three sockets 11 are functionally designated as a first socket, a second socket, and a third socket. When the fuse box is inserted forward, its positive and negative terminals are inserted into the first and second sockets, respectively; when the fuse box is inserted backward, its positive and negative terminals are inserted into the second and third sockets, respectively. To ensure accurate positioning of the fuse box and the base 1, a positioning port 18 is provided between adjacent sockets 11. This positioning port 18 is used to engage with positioning feet on the fuse box.

[0033] Furthermore, the structural design of each socket 11 is one of the core features of this invention. Specifically, each socket 11 includes a square receiving hole 12, a limiting groove 13 located on the upper side of the square receiving hole 12 and communicating with it, and a circular opening 14 located at the rear end of the square receiving hole 12. The square receiving hole 12 is the main body of the socket 11, and its cross-section is rectangular. The circular opening 14 penetrates the rear sidewall of the base 1 and communicates with the rear end of the square receiving hole 12. At the connection between the square receiving hole 12 and the circular opening 14, since the diameters of the two holes are different (the diameter of the circular opening 14 is smaller than the width of the square receiving hole 12), an annular limiting step 16 is formed. At the same time, in order to facilitate the insertion of the external end post, an insertion chamfer 17 is also processed at the rear edge of the circular opening 14, and the diameter of the chamfer gradually decreases from back to front.

[0034] Each socket 11 is fitted with a pin 3. The pin 3 is integrally formed from a single piece of conductive metal sheet (such as copper alloy) through a series of processes including precision cutting, stamping, and bending. This manufacturing method not only ensures that the pin 3 has excellent structural strength and conductivity, but also greatly improves production efficiency and dimensional consistency.

[0035] The pin 3 mainly consists of four functional parts: a wrapping tube 31, a square ring seat 32, a connecting piece 34, and a connecting terminal 33. In terms of forming and connection, the connecting piece 34 is located between the upper sides of the wrapping tube 31 and the square ring seat 32, connecting the two as a single unit. The connecting terminal 33 is integrally formed on the end of the square ring seat 32 away from the wrapping tube 31.

[0036] When the pin 3 is installed into the socket 11 of the base 1, both the surrounding round tube 31 and the square ring seat 32 are located inside the square receiving hole 12. The square ring seat 32 and the square receiving hole 12 are fitted with a clearance fit, which effectively prevents the pin 3 from rotating around its own axis within the square receiving hole 12. Simultaneously, since the square ring seat 32 is formed by bending sheet metal, a closing gap 322 naturally forms on its lower side; this is a normal phenomenon in the manufacturing process and does not affect its function.

[0037] The wrapping tube 31 is a hollow cylindrical structure, with its rear end (the end closest to the circular opening 14 of the base 1) expanding outward to form a flared section 312. This flared section 312 serves multiple purposes: First, its outer diameter is larger than the main body of the wrapping tube 31, so after the pin 3 is installed, the flared section 312 will axially abut against the limiting step 16 inside the insertion port 11, thus preventing the pin 3 from dislodging backward (towards the rear of the base 1). Second, the flared section 312 also serves as a guide structure, allowing the external end post to be inserted more smoothly into the wrapping tube 31. Furthermore, to ensure that the wrapping tube 31 generates a uniform and controllable elastic clamping force when the end post is inserted, a deformation slot 311 is provided axially along the lower side of the wrapping tube 31, penetrating its front and rear ends and connecting to its internal space. The deformation gap 311 allows the wrapped tube 31 to expand moderately when the end post is inserted, thereby providing a radial elastic clamping force to ensure close contact with the end post.

[0038] To securely lock the pin 3 within the socket 11 and prevent it from dislodging forward (i.e., towards the front of the base 1), a retaining plate 321 is integrally formed on the square ring seat 32 of the pin 3. Specifically, the retaining plate 321 is formed by partially cutting the upper part of the plate of the square ring seat 32 and then bending the cut part upward. The rear end of the retaining plate 321 remains connected to the body of the square ring seat 32, while its front end is inclined upward, forming an elastic structure similar to a cantilever beam. Correspondingly, a stop block 15 is integrally formed within the socket 11 of the base 1, located in front of the limiting groove 13.

[0039] During the process of pushing the pin 3 into the socket 11 from front to back, the upward-curved front end of the retaining plate 321 will first contact the upper wall of the limiting groove 13 and be pressed downward under the pushing force, resulting in elastic deformation. As the pin 3 continues to move backward until the retaining plate 321 is fully inserted into the limiting groove 13, the retaining plate 321 is no longer pressed by the upper wall, and its front end bounces upward by its own elasticity, returning to the tilted state. At this time, the front side of the retaining plate 321 just abuts against the stop block 15 located in front of the limiting groove 13. In this way, the pin 3 achieves axial locking in the socket 11: backward, it is limited by the flared section 312 of the tube 31 and the limiting step 16; forward, it is limited by the retaining plate 321 and the stop block 15. At the same time, the cooperation between the square ring seat 32 and the square receiving hole 12 prevents circumferential rotation.

[0040] The last part of the pin 3 is the connecting terminal 33, which is located on the front side of the base 1. The connecting terminal 33 is integrally formed on one side wall (e.g., the left or right side wall) of the end of the square ring base 32.

[0041] To increase its flexibility for connection with the circuit board, the connection terminal 33 is first bent from the side wall of the square ring seat 32 toward the center of the square ring seat 32, and then extends forward (i.e., away from the square ring seat 32). On this section of the plate where the connection terminal 33 extends forward, an outwardly protruding embossed strip 331 is formed on one side surface by a stamping process. Correspondingly, on the other side surface of the connection terminal 33, a stamped notch 332 corresponding to the position of the embossed strip 331 is formed due to the stamping process itself. The purpose of the embossed strip 331 is that when the connection terminal 33 is inserted into the connection hole of the circuit board or contacts the mating terminal, the protrusion can increase the local contact pressure, effectively piercing any oxide layer that may be present, thereby obtaining a better and more reliable electrical connection. In addition to being an inevitable product of the manufacturing process, the stamped notch 332 can also serve as a feature for visual identification or mechanical positioning during automated assembly.

[0042] Furthermore, to facilitate the installation of the entire fuse holder on a circuit board or other equipment, several forward-extending mounting posts 2 are integrally formed on the side wall of the base 1. In this embodiment, there are three mounting posts 2, located on the three sides of the base 1, and each mounting post 2 has a conical frustum 21 integrally formed at its front end (i.e., free end). The conical frustum 21 is necked from back to front, meaning its front diameter is smaller than its root diameter. A deformation opening 22 is provided on the conical frustum 21, which starts from the front end face of the conical frustum 21, extends backward, and penetrates both side walls of the conical frustum 21. The presence of the deformation opening 22 allows the conical frustum 21 to elastically contract inward when subjected to radial pressure. On the inner walls on both sides of the deformation opening 22, a pair of reinforcing blocks 23 are also provided facing each other (i.e., face to face). When the mounting post 2 passes through the mounting hole on the circuit board, the conical frustum 21 first contracts, then springs open after passing through, using its larger diameter at the root to form an inverted buckle, thereby locking the base 1 onto the circuit board. The reinforcing block 23 compensates for the strength loss caused by the opening 22, ensuring that the conical frustum 21 maintains good elasticity and structural integrity even after long-term use or repeated insertion and removal.

[0043] In summary, this utility model provides a fuse holder with a wrap-around pin 3. By utilizing the elastic clamping of the wrap-around round tube 31, the dual anti-rotation and anti-disengagement structure of the square ring seat 32 and the clamping plate 321, and the optimized design of the connection terminal 33, it effectively solves the problems of unreliable connection and easy loosening between the pin 3 and the end post in the prior art. It significantly improves the electrical connection stability and mechanical installation reliability of the fuse holder, while also taking into account the convenience of manufacturing and assembly.

[0044] It should also be noted that the terms used in this utility model, such as "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fuse holder with a wraparound pin, comprising a housing, characterized in that: The base has at least two insertion ports extending through its front and rear sides from left to right. Each insertion port is fitted with a pin. The pin includes a wrapping tube, a square ring seat, and a connecting terminal. A connecting piece is integrally formed between the wrapping tube and the upper side of the square ring seat. The connecting terminal is integrally formed on the end of the square ring seat away from the wrapping tube. The wrapping tube and the square ring seat are fixedly disposed in the insertion port. The connecting terminal is located on the front side of the base.

2. The fuse holder with a wrapped pin according to claim 1, wherein: The insertion port includes a square receiving hole, a limiting groove located on the upper side of the square receiving hole, and a circular opening located at the rear end of the square receiving hole. The square receiving hole is used to accommodate the wrapping tube and the square ring seat. The square ring seat is fitted into the square receiving hole with a clearance fit. The seat body has a stop block integrally formed on the front side of the limiting groove. The square ring seat has a retaining plate integrally formed on the upper side. When the retaining plate is located in the limiting groove, its front side abuts against the stop block. There is a limiting step between the square receiving hole and the circular opening. The limiting step is used to abut against the rear end of the wrapping tube. The circular opening communicates with the internal space of the wrapping tube.

3. The fuse holder with a wrapped pin of claim 2, wherein: The card plate is formed by cutting and bending the upper part of the square ring seat upwards. The rear end of the card plate is connected to the square ring seat, and the front end is tilted upwards.

4. The fuse holder with a wrapped pin of claim 2, wherein: The lower side of the wrapping tube has a deformation slit that extends axially from front to back, and the deformation slit penetrates into the internal space of the wrapping tube.

5. A fuse holder with a wrap-around pin according to claim 1 or 2, characterized in that: The connecting terminal is integrally formed on one side wall of the end of the square ring seat, and bends from one side of the square ring seat toward the middle of the square ring seat and then extends forward. The forward-extending part of the connecting terminal has a raised strip protruding to one side, and the connecting terminal has a corresponding stamped notch on the other side of the raised strip.

6. The fuse holder with a wrapped pin of claim 2, wherein: The rear end of the enclosing circular tube includes an outwardly expanding flared section, which is used to abut against the limiting step, and the seat body has an insertion chamfer on the circular opening.

7. The fuse holder with a wrapped pin of claim 2, wherein: The square ring seat has a closing gap on its lower side. The wrapping round tube, the square ring seat, the connecting piece, and the connecting terminal are all formed from the same piece of plate by cutting and bending.

8. The fuse holder with a wrapped pin of claim 1, wherein: The socket has three openings on the base, and each adjacent socket is provided with a positioning port.

9. The fuse holder with a wrapped pin of claim 1, wherein: The side wall of the base has several forward-extending mounting posts integrally formed.

10. The fuse holder with a wrapped pin of claim 9, wherein: The front end of the mounting column is integrally formed with a conical frustum. The conical frustum is necked from back to front. The conical frustum has deformation openings on both sides that extend through the side walls of the conical frustum. Reinforcing blocks are arranged facing each other on the inner walls of the two sides of the deformation openings of the conical frustum.

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