Resin assembly nuts

Abstract

This invention provides a resin assembly nut that can be manufactured without using a core with a male thread. [Solution] The resin assembly nut consists of a first half 1 and a second half 2, which are connected by a hinge connecting part 3 and have an integral structure that can be rotated around the connecting shaft to close in a girdle shape. The first half 1 has a flat contact surface 1a and a semi-cylindrical screw groove portion 1b, and the second half 2 has a flat contact surface 2a and a semi-cylindrical screw groove portion 2b. When the contact surfaces 1a and 2a come into contact with each other and are closed, the screw groove portions 1b and 2b face each other, and the screw grooves form a single continuous helical groove, forming a single cylindrical female thread.

Description

Technical Field

[0001] The present invention relates to a resin assembled nut made of synthetic resin.

Background Art

[0002] As a mechanical coupling means, the combination of a nut and a bolt is widely used. Although a nut made of synthetic resin has a disadvantage in that its mechanical strength is not sufficient and its processing precision is inferior compared to a metal nut, it is widely used because of its low price and light weight.

[0003] A general synthetic resin nut is manufactured by an injection molding method using a core. Specifically, after placing a core having a male thread on its outer peripheral surface in a mold, filling the mold with molten resin and molding, when taking out the molded product from the mold, a nut having a threaded hole portion inside is completed through a process of extracting while rotating the core.

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in this conventional manufacturing method, since it is necessary to mold a threaded groove portion having an internal female thread groove instead of a simple through hole, a special core having a male thread shape is indispensable. Also, including the process of removing this core after molding, these are factors that increase the manufacturing cost.

[0005] An object of the present invention is to solve the above-described problems and provide a resin assembled nut that can be manufactured without using a core having a male thread.

Means for Solving the Problems

[0006] The present invention provides a resin assembly nut for solving the above problems, comprising a first half and a second half continuous via a connecting portion, wherein the first half is provided with a planar first contact surface and a semi-cylindrical first screw groove formed by recessing the first contact surface, and the second half is provided with a planar second contact surface and a semi-cylindrical second screw groove formed by recessing the second contact surface, and the first and second screw grooves bring into contact with the first and second contact surfaces with the connecting portion as the axis of rotation, thereby forming a cylindrical hole, and a screw groove is engraved on the inner surface of the cylindrical hole. [Effects of the Invention]

[0007] Thus, the resin-made assembly nut according to the present invention employs a split structure in which the first and second halves are connected by a connecting part, and each half is provided with a semi-cylindrical screw groove. This eliminates the need to use a core with a male screw shape, which was indispensable in the manufacture of conventional synthetic resin nuts. As a result, the complicated process of rotating and removing the core after molding is eliminated, and the manufacturing process is greatly simplified. Consequently, production efficiency can be improved and manufacturing costs can be reduced. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of an assembled resin nut. [Figure 2] This is a perspective view of the injection molding process. [Figure 3] This is a perspective view during the closing process. [Modes for carrying out the invention]

[0009] The present invention will be described in detail below with reference to the illustrated embodiments. Figure 1 is a perspective view of the assembled resin assembly nut, Figure 2 is a perspective view of the resin assembly nut during injection molding, and Figure 3 is a perspective view of the resin assembly nut during the closing process.

[0010] The resin assembly nut according to this invention is composed of a first half 1 made of synthetic resin and a second half 2 made of the same material, which are substantially rectangular parallelepipeds, and these are manufactured by injection molding using a mold. As shown in Figures 2 and 3, the first half 1 and the second half 2 are connected by a hinge connecting part 3, and by rotating around the connecting shaft, the outer diameter becomes square as shown in Figure 1, and the nut is formed as a single unit that can be closed in a gable shape.

[0011] The first half 1 is provided with a flat contact surface 1a and a semi-cylindrical threaded groove portion 1b formed by recessing the central part of the contact surface 1a. The inner surface of the threaded groove portion 1b is engraved with a threaded groove consisting of a female threaded portion for screwing in a male thread such as a bolt. Similarly, the second half 2 is provided with a flat contact surface 2a and a threaded groove portion 2b having a semi-cylindrical threaded groove.

[0012] On the contact surface 1a of the first half 1, a pair of elastic locking pieces 1c, each having a hook at its tip, are elastically erected on both sides of the screw groove 1b. On the other hand, on the contact surface 2a of the second half 2, locking portions 2c, each consisting of an opening, are formed on both sides of the screw groove 2b, at positions facing the pair of locking pieces 1c.

[0013] When using this resin assembly nut, the first half 1 and the second half 2 are folded together in a girdle shape, using the connecting part 3 as an axis, starting from a state where the contact surface 1a of the first half 1 and the contact surface 2a of the second half 2 are flush, as shown in Figures 2 and 3. As a result, the contact surfaces 1a and 2a come into contact with each other, as shown in Figure 1, and in this closed state, the screw grooves 1b and 2b face each other, forming a single continuous helical groove and creating a single cylindrical female thread.

[0014] Furthermore, when the first half 1 and the second half 2 are closed, the locking piece 1c of the first half 1 elastically engages with the locking portion 2c of the second half 2, locking the first half 1 and the second half 2 together. This maintains the closed state after assembly and prevents the closed state from being unintentionally released. In addition, a stable nut shape can be maintained even when rotational or axial forces are applied during bolt fastening.

[0015] Thus, since a single female thread is formed as a helical groove in the threaded grooves 1b and 2b, a bolt with a male thread can be smoothly screwed in. Therefore, while exhibiting the same fastening function as conventional integrally molded nuts, each component can be injection molded in a divided shape, eliminating the need for a core with a male thread during molding and significantly simplifying the manufacturing process.

[0016] Furthermore, because the resin assembly nut according to this invention has a segmented structure, various synthetic resins such as PVC, PPS, PP, and PEEK can be easily applied as molding materials, and it is also possible to impart chemical resistance, heat resistance, or electrical insulation depending on the intended use. For this reason, it is suitable for applications where metal nuts are prone to corrosion and insulation problems, such as air conditioning equipment, electrical equipment, pipe fixing members, and outdoor equipment.

[0017] Thus, according to this embodiment, by using a two-part opening and closing structure via the connecting portion 3, it is possible to simultaneously achieve ease of manufacturing, cost reduction, and practical fastening performance.

[0018] Furthermore, since the resin assembly nut according to the embodiment has a square outer shape, it can be attached to a frame or the like in a way that prevents rotation, allowing the bolt to be screwed into the nut during installation. [Explanation of symbols]

[0019] 1 Part 1 1a Contact part 1b Thread groove 1c Locking piece 2 Second half 2a Contact part 2b Threaded groove 2c Locking part 3 Connecting part

Claims

1. A resin assembly nut consisting of a first half and a second half that is continuous via a connecting portion, The first half is provided with a planar first contact surface and a semi-cylindrical first screw groove formed by recessing the first contact surface. The second half is provided with a flat second contact surface and a semi-cylindrical second screw groove formed by recessing the second contact surface. The first and second contact surfaces come into contact with the connecting portion as the axis of rotation, thereby forming a cylindrical hole through the first and second screw grooves. A resin assembly nut characterized by having a screw groove engraved on the inner surface of the cylindrical hole.

2. The resin assembly nut according to claim 1, characterized in that, starting from a state in which the first contact surface and the second contact surface are flush, the cylindrical hole is formed by folding the first half and the second half together in a girdle shape with the connecting portion as the axis of rotation.

3. On both sides of the first screw groove on the first contact surface, a pair of locking pieces, each with a hook at its tip, are erected. The resin assembly nut according to claim 1 or 2, characterized in that a pair of locking portions for locking with the pair of locking pieces are formed on both sides of the second screw groove on the second contact surface.

4. The resin assembly nut according to claim 1 or 2, characterized in that the periphery of the contact surface of the first half and the second half is square-shaped.

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