Power plug and cord securing structure

Abstract

The utility model discloses a power plug and wire fastening structure, it includes by bottom shell and shell cover constitute's plug shell body and three core wires, and the inner surface of bottom shell is equipped with lower tooth part, and the inner surface of shell cover is equipped with corresponding upper tooth part, and only through the buckle structure buckling locking between bottom shell and shell cover, make upper tooth part and lower tooth part bite three core wire sheath simultaneously, and rely on the sustained compression force of buckle and keep locking, thereby completely omitting screw, and lower tooth part is constituted by linear first tooth part and inner arc line second tooth part back and forth distribution, and upper tooth part is the outer arc line tooth part between the two, and forms self-locking wedge after occlusion, and the groove is equipped between two tooth tips of upper tooth part, and can provide sheath material and embed under pressure, and further increase the friction and prevent the loss of relief, and the buckle structure is symmetrically buckled by two recesses of bottom shell rear side and two hook parts of shell cover rear side, and also can add ring buckle around the shell body, to enhance the fatigue life.

Description

Technical Field

[0001] This utility model relates to a power plug, and more particularly to a wire fastening structure for a power plug. Background Technology

[0002] Power plugs typically consist of a male and a female power plug, and their structure generally comprises a plug and a three-core wire. The plug contains a housing and three metal pins within the housing. The red, yellow, and green wires of the power cord are each connected to one of the three metal pins and secured to the housing with screws. Furthermore, wire clamps and two screws are used at the rear of the housing to further secure the wires within the housing.

[0003] However, this traditional tightening method has some drawbacks. First, the screw-driving operation requires specialized tools, which undoubtedly increases the complexity and tediousness of the process. For ordinary users, it may require a significant amount of time and effort to complete the tightening work, reducing its convenience. Second, the screw may affect electrical performance during the tightening process. On the one hand, the screw installation requires high precision; if the screw is tightened too much or too little, it may lead to poor contact between the wire and the metal pin, thus affecting the efficiency and stability of current transmission. On the other hand, the screw itself may loosen or corrode due to long-term use or environmental factors, which can affect the electrical connection performance of the entire power plug and even pose safety hazards such as leakage or short circuit risks. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a wire fastening structure for a power plug that eliminates the need for screws.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a power plug, including a plug body and a three-core wire, wherein the plug body includes a plug shell and three metal guide pins inside the plug shell, and the plug shell is formed by a bottom shell and a shell cover being fixed to each other by a first screw;

[0006] The three-core wire includes a sheath and three internal wires. Each wire is connected to a metal guide pin in a corresponding manner by a second screw and is fixed to the bottom shell by the second screw to form an electrical connection area.

[0007] The bottom shell is provided with a lower toothed portion, and the shell cover is provided with an upper toothed portion. The upper toothed portion and the lower toothed portion engage with the sheath of the three-core wire to form a fastening area. The fastening area is located on the rear side of the electrical connection area.

[0008] The bottom shell and the rear side of the shell cover are provided with a snap-fit ​​structure to secure the biting force of the upper and lower teeth;

[0009] A further technical solution of this utility model is: the lower tooth portion includes a first tooth portion and a second tooth portion distributed front to back on the bottom shell, the first tooth portion and the second tooth portion extending in the width direction of the bottom shell;

[0010] The upper tooth is located between the first tooth and the second tooth.

[0011] A further technical solution of this utility model is: the first tooth is a straight tooth, the second tooth is an inner arc tooth, and the arc of the inner arc tooth faces the front of the plug;

[0012] The upper toothed portion is an outer arc toothed portion; the arc of the outer arc toothed portion faces the rear of the plug.

[0013] A further technical solution of this utility model is: the bottom shell includes a bottom wall and a first peripheral side wall, and the lower tooth is disposed on the first protrusion on the inner bottom surface of the bottom wall;

[0014] The shell cover includes a top wall and a second peripheral side wall, and the upper toothed portion is disposed on a second protrusion on the inner bottom surface of the top wall;

[0015] A further technical solution of this utility model is as follows: the first peripheral sidewall includes a first front sidewall, a first left and right sidewalls and a first rear sidewall; the second peripheral sidewall includes a second front sidewall, a second left and right sidewalls and a second rear sidewall;

[0016] The buckle structure includes two recesses symmetrically arranged on the first rear sidewall and two hooks symmetrically arranged on the second rear sidewall, the hooks hooking onto the recesses.

[0017] A further technical solution of this utility model is: the upper tooth portion includes two tooth tips on the left and right, and a groove is provided on the second protrusion located between the two tooth tips on the left and right.

[0018] Another technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: it includes a plug body and a three-core wire. The plug body includes a plug shell, the plug shell includes a bottom shell and a shell cover. The bottom shell includes a bottom wall and a first peripheral side wall. The inner surface of the bottom wall is provided with a first protrusion, and the first protrusion is provided with a lower tooth. The shell cover includes a top wall and a second peripheral side wall. The inner surface of the top wall is provided with a second protrusion, and the second protrusion is provided with an upper tooth.

[0019] The three-core conductor includes a sheath and three internal conductors;

[0020] The upper and lower teeth engage with the sheath of the three-core wire, and a snap-fit ​​structure is provided between the first peripheral wall of the bottom shell and the second peripheral wall of the shell cover to secure the engagement force of the upper and lower teeth.

[0021] A further technical solution of this utility model is as follows: the first peripheral sidewall includes a first front sidewall, a first left and right sidewalls and a first rear sidewall; the second peripheral sidewall includes a second front sidewall, a second left and right sidewalls and a second rear sidewall;

[0022] The buckle structure includes two recesses symmetrically arranged on the first rear sidewall and two hooks symmetrically arranged on the second rear sidewall, wherein the hooks hook onto the recesses;

[0023] A further technical solution of this utility model is: the lower tooth portion includes a first tooth portion and a second tooth portion distributed front to back on the bottom shell, the first tooth portion and the second tooth portion extending in the width direction of the bottom shell;

[0024] The upper tooth portion is located between the first tooth portion and the second tooth portion;

[0025] A further technical solution of this utility model is: the first tooth is a straight tooth, the second tooth is an inner arc tooth, and the arc of the inner arc tooth faces the front of the plug;

[0026] The upper toothed portion is an outer arc toothed portion; the arc of the outer arc toothed portion faces the rear of the plug;

[0027] A further technical solution of this utility model is: the middle position of the bottom shell and the shell cover is fixed by a first screw;

[0028] A further technical solution of this utility model is: the upper tooth portion includes two tooth tips on the left and right; a groove is provided on the second protrusion located between the two tooth tips on the left and right.

[0029] Compared with existing technologies, the advantages of this utility model are: the power plug design uses a snap-fit ​​structure between the bottom shell and the cover, replacing the traditional screw fixing method, thus achieving rapid assembly and fastening of the plug housing. This structural optimization not only simplifies the assembly process, reduces assembly steps and required tools, but also reduces the risk of poor contact caused by improper screw operation (such as overtightening or loosening), improving production efficiency and product quality. At the same time, the stability of the snap-fit ​​structure effectively prevents the housing from loosening during long-term use, enhancing the product's durability.

[0030] The interlocking technology of the upper and lower teeth, combined with the continuous clamping force provided by the snap-fit ​​structure, forms a firm and secure fastener for the sheath of the three-core conductor. This fastening method not only avoids the damage to the wire that may be caused by traditional screw tightening, but also further enhances the stability of the wire under various operating conditions through the stress dispersion effect of progressive wedging and elastic grooves. Even in usage scenarios involving long-term bending or high-frequency vibration, the wire can still maintain reliable fixation, effectively preventing electrical faults such as poor contact and short circuits caused by loose wires, significantly improving the safety and reliability of the power plug.

[0031] Furthermore, the screwless design eliminates the problem of increased contact resistance caused by loose screws, ensuring a long-term stable electrical connection between the wires and metal pins. This reduces the temperature rise of the plug, minimizing the risk of arcing and localized overheating, thereby improving electrical safety margins and service life. This structural optimization achieves cost reduction while meeting electrical performance requirements, providing a more competitive solution for the widespread application of power plugs. Attached Figure Description

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0033] Figure 1 This is a schematic diagram of the overall structure of the power plug in Embodiment 1. Figure 1 ;

[0034] Figure 2 This is a schematic diagram of the overall structure of the power plug in Embodiment 1. Figure 2 ;

[0035] Figure 3 This is a structural disassembly diagram of the power plug in Example 1;

[0036] Figure 4 This is a schematic diagram of the internal structure of the bottom shell in Embodiment 1;

[0037] Figure 5 This is a schematic diagram of the internal structure of the shell cover in Embodiment 1;

[0038] Figure 6 This is a schematic diagram of the overall structure of the power plug in Embodiment 2;

[0039] Figure 7 This is a schematic diagram of the internal structure of the power plug in Example 2. Detailed Implementation

[0040] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0041] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0042] Example 1:

[0043] like Figures 1 to 3 As shown, a power plug 100 includes a plug body 20 and a three-core wire 30. The plug body 20 includes a plug housing 21 and three metal guide pins L inside the plug housing 21. The plug housing 21 is formed by a bottom shell a and a cover b fixed to each other by a first screw 40. The three-core wire 30 includes a sheath 31 and three wires s inside. Each wire s is connected to the metal guide pins L one by one by a second screw 41 and is fixed to the bottom shell a by the second screw 41 to form an electrical connection area p1.

[0044] This technology integrates the "plug housing 21, metal guide pin L, and wire s" into a simplified structure. The bottom shell a and the cover b are locked together by only one first screw 40 arranged along the central axis of the plug, which can complete the shell closing process in one go. At the same time, the number of screws is reduced and the total number of parts is reduced compared to traditional plugs, which makes the overall structure simple and improves product quality.

[0045] like Figure 4 and Figure 5 As shown, the bottom shell a has a lower toothed portion m, and the cover b has an upper toothed portion n. The lower toothed portion m and the upper toothed portion n engage with the sheath 31 of the three-core wire 30 to form a fastening area p2. The fastening area p2 is located behind the electrical connection area p1. The bottom shell a and the cover b have a snap-fit ​​structure 60 on their rear sides to secure the engagement force between the upper toothed portion m and the lower toothed portion n. This technique uses a snap-fit ​​design for the bottom shell a and the cover b, which are locked together by a first screw 40 along the central axis of the plug housing 21 to form a closed metal guide needle L receiving cavity. This eliminates the need for lateral core pulling during injection molding of the plug housing 21, simplifying the mold structure. At the same time, the first screw 40, located on the central axis, can apply a balanced locking force, preventing housing warping due to uneven force and reducing eccentric wear during subsequent insertion and removal.

[0046] The power plug 100's wire fastening structure includes a plug body 20 and a three-core wire 30. The plug body 20 includes a plug housing 21, which includes a bottom shell a and a cover b. The three-core wire 30 includes a sheath 31 and three internal wires s. The bottom shell a includes a bottom wall w and a first peripheral side wall v1. The inner surface of the bottom wall w has a first protrusion h1, and the first protrusion h1 has a lower tooth m. The cover b includes a top wall u and a second peripheral side wall v2. The inner surface of the top wall u has a second protrusion h2, and the second protrusion h2 has an upper tooth n. The upper tooth n and the lower tooth m engage with the sheath 31 of the three-core wire 30. A snap-fit ​​structure 60 is provided between the first peripheral side wall v1 of the bottom shell a and the second peripheral side wall v2 of the cover b.

[0047] The technical effects of this technique have been explained in detail above: This technique achieves a triple progressive biting force by having the upper tooth n and lower tooth m engage with the snap-fit ​​structure 60 in a double-locking manner, thereby securing the three-core wire 30. Even if the three-core wire 30 is bent for a long time or vibrates at high frequency, it will remain firmly in place. At the same time, the snap-fit ​​structure 60 makes the bottom shell a and the cover b fit together better, achieving a secure fastening effect.

[0048] The above-mentioned technical means can complete the locking of the housing and the fastening of the wires. The entire process does not require screws, washers or any tools. The screwless structure eliminates the increase in contact resistance caused by loosening. At the same time, only one snapping action is needed to complete the closing of the housing and the fastening of the wires during assembly, which significantly reduces the number of processes and the complexity of assembly.

[0049] By eliminating all screws and taps used to clamp the housing and wire sheath in traditional plugs, and creating an elastic groove between the two tooth tips, the extruded material from the sheath can be accommodated and stress can be distributed during the clamping process. This eliminates the need for screws, washers, and taps, resulting in a reduction in both material and mold costs. At the same time, since there is no risk of screw loosening, the housing and wire maintain a constant clamping force, ensuring long-term stable contact resistance.

[0050] It should also be noted that the lower toothed portion m includes a first toothed portion m1 and a second toothed portion m2 distributed front to back on the bottom shell a. The first toothed portion m1 and the second toothed portion m2 extend in the width direction of the bottom shell a. The upper toothed portion n is located between the first toothed portion m1 and the second toothed portion m2. The first toothed portion m1 is a straight toothed portion, and the second toothed portion m2 is an inner arc toothed portion with the arc of the inner arc toothed portion facing the front of the plug. The upper toothed portion n is an outer arc toothed portion with the arc of the outer arc toothed portion facing the rear of the plug. This technical means locks the wires by the coordinated locking of the inner and outer arc toothed portions and the pre-tightening force of the buckle. The outer arc toothed portion n faces the rear and forms a mirror wedging with the front toothed portion, resulting in locking and achieving bidirectional tensile resistance. At the same time, the buckle applies a constant pre-tightening force at one time, making the wire fixing method more reliable than the traditional method.

[0051] Meanwhile, the bottom shell a includes a bottom wall w and a first peripheral side wall v1. The lower tooth m is provided on the first protrusion h1 on the inner bottom surface of the bottom wall w. The shell cover b includes a top wall u and a second peripheral side wall v2. The upper tooth n is provided on the second protrusion h2 on the inner bottom surface of the top wall u. The first peripheral side wall v1 includes a first front side wall v1-1, a first left and right side wall v1-2, and a first rear side wall v1-3. The second peripheral side wall v2 includes a second front side wall v2-1, a second left and right side wall v2-2, and a second rear side wall v2-3. The snap-fit ​​structure 60 includes two recesses 601 symmetrically provided on the first rear side wall v1-3 and two hooks 602 symmetrically provided on the second rear side wall v2-3. The hooks 602 hook onto the recesses 601. The upper tooth n includes two tooth tips n01 on the left and right sides. The second protrusion h2 located between the two tooth tips n01 is provided with a groove n02. This technology uses the raised inner surfaces of the bottom wall (w) and top wall (u) to obtain lateral support for the circumferential retaining wall, preventing cracking during engagement. At the same time, the raised grooves (n02) are used to engage larger wire diameters, facilitating force release from the teeth on both sides. Furthermore, a portion of the protective sheath can be squeezed into the groove to make the wire more securely fixed, suppressing fretting wear caused by vibration and improving product safety and durability.

[0052] Example 2:

[0053] like Figure 6 and Figure 7 As shown, the power plug 100 of this embodiment has the same overall structure as that of Embodiment 1, especially the wire fastening structure of the power plug 100, which is consistent with the corresponding part of Embodiment 1, and will not be described again here. The difference is that the internal structure of the plug body 20 adopts three power cord clamping spring assembly 50 instead of three metal guide pins L. The spring assembly 50 can open adaptively and form surface-to-surface contact under the action of the rebound force, ensuring low contact resistance and stable current carrying capacity.

[0054] That is, the power plugs 100 of Embodiment 1 and Embodiment 2 have different specifications, and the power plugs 100 of different specifications can meet the needs of different usage scenarios and products in the consumer market.

[0055] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. 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 limitations on this utility model. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and cannot be considered as limitations on this utility model.

[0056] This paper describes the power plug and wire fastening structure provided by this utility model. Specific examples are used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand this utility model and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A power plug, characterized in that: The device includes a plug body and a three-core wire. The plug body includes a plug housing and three metal guide pins inside the plug housing. The plug housing is formed by a bottom shell and a cover shell fixed together by a first screw. The three-core wire includes a sheath and three internal wires; each wire is connected to a metal guide pin in a corresponding manner by a second screw, and is fixed to the bottom shell by the second screw to form an electrical connection area; The bottom shell is provided with a lower toothed portion; the cover is provided with an upper toothed portion, the upper toothed portion and the lower toothed portion engage with the sheath of the three-core wire to form a fastening area; the fastening area is located on the rear side of the electrical connection area; The bottom shell and the rear side of the shell cover are provided with a snap-fit ​​structure to secure the biting force of the upper and lower teeth.

2. The power plug according to claim 1, characterized in that: The lower toothed portion includes a first toothed portion and a second toothed portion distributed front to back on the bottom shell, the first toothed portion and the second toothed portion extending in the width direction of the bottom shell; The upper tooth is located between the first tooth and the second tooth.

3. The power plug according to claim 1, characterized in that: The first tooth is a straight tooth, and the second tooth is an inner arc tooth, the arc of which faces the front of the plug; The upper toothed portion is an outer arc toothed portion; the arc of the outer arc toothed portion faces the rear of the plug.

4. The power plug according to claim 1, characterized in that: The bottom shell includes a bottom wall and a first peripheral side wall, and the lower tooth is disposed on a first protrusion on the inner bottom surface of the bottom wall; The shell cover includes a top wall and a second peripheral side wall, and the upper toothed portion is disposed on a second protrusion on the inner bottom surface of the top wall; 5. The power plug according to claim 1, characterized in that: The first circumferential sidewall includes a first front sidewall, a first left and right sidewalls, and a first rear sidewall; the second circumferential sidewall includes a second front sidewall, a second left and right sidewalls, and a second rear sidewall. The buckle structure includes two recesses symmetrically arranged on the first rear sidewall and two hooks symmetrically arranged on the second rear sidewall, the hooks hooking onto the recesses.

6. The power plug according to claim 1, characterized in that: The upper toothed part includes two tooth tips, left and right, and a groove is provided on the second protrusion located between the two tooth tips.

7. The power plug's cord fastening structure, characterized in that: include It includes a plug body and a three-core wire, wherein the plug body includes a plug housing. The plug housing includes a bottom shell and a cover; The three-core conductor includes a sheath and three internal conductors; The bottom shell includes a bottom wall and a first peripheral side wall. The inner surface of the bottom wall is provided with a first protrusion, and the first protrusion is provided with a lower tooth. The shell cover includes a top wall and a second peripheral side wall. The inner surface of the top wall is provided with a second protrusion, and the second protrusion is provided with an upper tooth. The upper and lower teeth engage with the sheath of the three-core conductor; A snap-fit ​​structure is provided between the first peripheral sidewall of the bottom shell and the second peripheral sidewall of the shell cover to secure the biting force of the upper and lower teeth.

8. The power plug's wire fastening structure according to claim 7, characterized in that: The first circumferential sidewall includes a first front sidewall, a first left and right sidewalls, and a first rear sidewall; the second circumferential sidewall includes a second front sidewall, a second left and right sidewalls, and a second rear sidewall. The buckle structure includes two recesses symmetrically arranged on the first rear sidewall and two hooks symmetrically arranged on the second rear sidewall, the hooks hooking onto the recesses.

9. The power plug wire fastening structure according to claim 7, characterized in that: The lower toothed portion includes a first toothed portion and a second toothed portion distributed front to back on the bottom shell, the first toothed portion and the second toothed portion extending in the width direction of the bottom shell; The upper tooth is located between the first tooth and the second tooth.

10. The power plug's wire fastening structure according to claim 7, characterized in that: The first tooth is a straight tooth, and the second tooth is an inner arc tooth, the arc of which faces the front of the plug; The upper toothed portion is an outer arc toothed portion; the arc of the outer arc toothed portion faces the rear of the plug.

11. The power plug's wire fastening structure according to claim 7, characterized in that: The bottom shell and the cover are fixed at the middle position by a first screw.

12. The power plug's wire fastening structure according to claim 7, characterized in that: The upper tooth portion includes two tooth tips, left and right; a groove is provided on the second protrusion located between the two tooth tips.

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