JPS602335Y2 - female thread - Google Patents

Description

[Detailed description of the invention] The present invention relates to a female screw that is compatible with long-lead screws such as self-tapping screws (male screws), and allows engagement of self-tapping screws in resin-molded casings, etc., without the need to take the trouble of providing taps. This is what I did.

This will be explained below along with examples.

In Figures 1 and 2, 1 is a self-tapping screw (male thread), 2 is a wire shaped like a bent paper clip, and 3 is a vinyl chloride heat shrink tube, which shrinks when exposed to hot air from a hair dryer, etc. It connects a tapping screw 1 and a wire 2.

In this case, when the male screw 1 is turned in the opposite direction and removed, the heat-shrinkable tube 4 is molded along the shape of the male screw 1 to form a female screw shape.

Although the axial restraint force (removal force) due only to the shrunken tube 4 is small, the restraint force is exerted at one end 5 of the wire 2 that engages along the lead of the male screw 1.

In other words, it is in charge of the threads of the female thread.

Further, other parts of the wire 2, for example 6, together with the aforementioned one end 5, engage with the lead of the male screw 1 to prevent it from falling and at the same time receive tension in the axial direction, and parts 7 and 8 support the male screw 1 from both sides. At the same time, it provides rigidity to the tube 4 and plays a role in maintaining its shape.

5' is a part fixed to the housing or the like.

3 and 4 show the state in which the panel 9 is attached to the housing 10.

A female threaded portion made up of the tube 4 and the wire 2 is embedded in the housing 10 and held therebetween.

At this time, part of the casing can also be held together with a heat shrink tube, or an adhesive can also be used.

As shown in Fig. 5, the wire 2 is made by providing an engaging part 12 (corresponding to (2)) corresponding to the male thread in a part of the sheet metal 11, covering this with a shrink tube 4, and processing it by heat. You can do it like this.

In addition, the material used can be plastic screws or metal screws.

In addition, even if it is difficult to mold the female thread part at the same time when molding the casing, if you form a holding part for the male thread in advance, such as an engaging part of wire or sheet metal, then the original female thread can be easily replaced with the tube. It is advantageous in practice.

In the above embodiment, a self-tapping screw was explained, but the present invention is not limited to a self-tapping screw, and can be applied to any screw with a long lead.

As is clear from the above embodiments, the present invention involves engaging a screw thread with one end of a wire bent inside an ellipse, and heat-shrinking a heat-shrinkable tube to form a circular portion and the other end of the engaging fitting. Since it is configured to be attached to the housing, it has the effect of making the female screw cheaper.

In addition, in the present invention, the engagement fitting engages with two or three points of the screw thread, so even if the pitch of the male thread and the pitch of the engagement fitting are different, it is easy to change the pitch of the engagement fitting. , it has the effect of having good pitch flexibility.

Furthermore, in the present invention, when the male thread is screwed into the female thread, the circular part and the other end of the engagement fitting are attached to the housing, so
This has the effect that the female thread does not rotate due to the rotation of the male thread.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the female screw component in an embodiment of the present invention, Fig. 2 is a cross-sectional view of the spaced screw, Fig. 3 and Fig. 4 are the same cross-sectional view when installing the case, FIG. 5 is a sectional view of another embodiment. 1...Tapping screw, 2...Wire, 3
...Heat shrink tube.

Claims (1)

[Scope of utility model registration request] A retaining fitting in which one end of an oval wire is bent inside the oval to match the inclination angle of the screw, and the other end is bent outside the oval, and a heat shrink tube inserted in the longitudinal direction of this engaging fitting. and engaging one end of the wire bent inside the oval with a screw thread, heat-shrinking the heat-shrinkable tube, and attaching the circular portion and the other end of the engaging fitting to the housing. Installed female screw.