JPH0222270Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a retaining mechanism for attaching synthetic resin members to daily necessities and other items.

(Prior Art) For example, hangers and drying equipment are often manufactured from materials such as polypropylene that cannot be used with adhesives. Therefore, in order to attach separately molded parts and nuts, it is necessary to rely on a screw structure or an engagement structure, but this has the disadvantage that it is easy to come off later.

(Technical issue) Therefore, the present invention was developed by simply screwing the parts together.
To provide a mechanism for preventing a synthetic resin member from coming off easily.

(Technical means) Therefore, the present invention forms a male threaded portion 2 with a larger diameter than the shaft diameter at the tip of the shaft body 1, and a retaining portion 3 with a larger diameter than the root diameter of the thread at the base end of the male threaded portion. A deep hole portion 5 into which the shaft body 1 enters is formed in the component 4 to be attached to the deep hole portion 5, and an engagement edge 6a with which the retaining portion 3 engages is provided at the back of the deep hole portion 5. This is a slip-out prevention mechanism for a synthetic resin member in which a female threaded part 7 is formed in a part 5 to be screwed into a threaded part 2.

(Effect of the invention) The component 4 is attached to the shaft body 1 with a screw, and since the male threaded portion 2 has a retaining portion 3 with a diameter larger than the root diameter at the base end, the screw of the female threaded portion 7 is screwed together. It ends up climbing over the mountain, and as a result, if it completely climbs over it, it becomes impossible to remove it easily.

(Embodiment) The illustrated embodiment shown in FIGS. 1 to 4 relates to the case where a nut-shaped part 4, which is an end treatment member also made of synthetic resin, is attached to the end shaft 1 of a rod 8 made of synthetic resin. The shaft body 1 has a protruding portion 9 having a tapered circumferential surface 9a at its base, and a flange-like retaining portion 3 and a male thread portion 2 at its end. The end processing component 4 is formed in the shape of a so-called cap nut, and has a recess 10 having a tapered inner circumferential surface 10a for receiving the protrusion 9 at its entrance.
There is a retaining part 3 and a male thread part 2 deep inside the deep hole part 5.
It has a blind hole 6 which accommodates the retaining portion 3 and has an engaging edge 6a with the retaining portion 3.

The female threaded portion 7 is formed between the blind hole 6 and the entrance recessed portion 10, but it is provided not on the entire inner circumference of the deep hole portion 5 but partially, and in the illustrated embodiment, it is formed in an arc of about one-sixth of the entire circumference. They are placed in two locations facing each other. The size of the circular arc of this female threaded part 7 and the number of parts to be provided can be arbitrarily determined depending on the aspect of the collar-like retaining part 3 of the shaft body 1. In each figure, reference numeral 11 indicates a spherical portion provided at the end of the component 4, and reference numeral 12 indicates a flat surface provided at several equal intervals on the outer peripheral surface of the component. In the above embodiment, in order to attach the component 4, it is sufficient to insert the male threaded part 2 of the rod material 8 into the deep hole 5 and screw it into the female threaded part 7, and the retaining part 3 is connected to the male threaded part 8. Since the diameter is larger than the root diameter, the crest 7a of the female threaded portion 7 is plastically deformed (or elastically deformed or both) when it is inserted, and when it reaches the blind hole 6 at the back, it engages with the engagement edge 6a. to finish installation that is difficult to remove. Therefore, the protrusion 9 and the recess 10 have a tapered peripheral surface 9a and an inner peripheral surface 10a.
However, depending on the degree of this fit, the parts 4 can be fixed or rotatable.

Next, in the example shown in FIG.
The example in the figure is the open end side and the recess 10 from the example in Figure 5.
7 and 8 illustrate the component 4 of the above embodiment and the manner in which it is utilized. This embodiment can be used, for example, to assemble the ends of the hanging frames 15 of plastic hangers 14, to assemble dish towel racks and other hangers 16, to treat the ends of hanging rods 17, and can also be applied to the legs of various products. be able to.

(Effect of the invention) Therefore, according to the invention, the retaining part 3 having a diameter larger than the root diameter is provided at the base end of the male threaded part 2 of the component 4 which is screwed onto the shaft body 1. It is screwed into the female threaded portion 7 provided on the fourth side in a self-tapping manner, and after passing through the female threaded portion 7, it engages with the engagement edge 6a, so that it does not come off easily. Therefore, the installation work is as simple as that of the conventional nut type, and it is extremely effective when installing parts that cannot be used with adhesive without being pulled out.

[Brief explanation of drawings]

The drawings show an embodiment of the mechanism for preventing the synthetic resin member from falling out according to the present invention. Figure 1 is a side sectional view before installation, Figure 2 is a rear view of the component, and Figure 3 is a side sectional view after installation. , FIG. 4 is a plan view of the same as the above, FIGS. 5 and 6 are sectional views of two modified examples of the component, and FIGS. 7 and 8 are explanatory diagrams showing two examples of application to articles. 1... Shaft body, 2... Male thread part, 3... Retention part,
4... Part, 5... Deep hole, 6a... Engagement edge, 7
...Female thread part.

Claims (1)

[Scope of utility model registration request] A male threaded portion 2 with a larger diameter than the shaft diameter is formed at the tip of the shaft body 1, and a retaining portion 3 with a larger diameter than the root diameter of the thread is provided at the base end of the male threaded portion. An engaging edge 6 forms a deep hole portion 5 into which the shaft body 1 enters, and the engagement edge 6 engages with the retaining portion 3 deep inside the deep hole portion 5.
A mechanism for preventing slipping out of a synthetic resin member, in which a female screw portion 7 is formed in the deep hole portion 5 to be screwed into the screw portion 2.