JPH07279929A - Fastener and fastening method - Google Patents

Abstract

PURPOSE:To facilitate removing of a fastner from a resin member by letting the fastner have a head part to be engaged with an attaching tool and an internal thread formed on the inner diameter side of a main body, and forming an internal thread part formed on the base material having the same fastening direction as that of the internal thread of the main body, and fitting the main body into the base material. CONSTITUTION:An internal thread 7 in the inside diameter part has the same direction as the fastening direction of a spiral line 3 on the outside diameter part. A fastener 1 is tapped while being advanced in the axial direction of a hole part 8 previously formed on a resin member 4 by using a screwdriver to be engaged with a groove of a head part, and then it is stopped to the specific fastening torque when a fastener 1 is engaged with the resin member 4. When a member to be fastened 5 is attached, a fastening screw 6 is fixed to the internal thread 7 on the internal diameter of the fastener 1 through a hole formed on the member to be fastened 5 like a conventional insert nut. When the fastener 1 is removed from the resin member 4, it is made the opposite operation to the fitting operation, thereby removing can be easily made.

Description

Detailed Description of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastener for fastening a member to be fastened to a resin member as a base material and a fastening method therefor.

[0003]

2. Description of the Related Art Conventionally, a method of using a self-tapping screw for resin has been known as a means for attaching other parts to a resin member used in electronic equipment or the like. But,
With this method, there is a drawback that the tapped female screw portion is destroyed by repeated tightening and loosening, and the entire component becomes unusable. As a means adopted to solve such a drawback, insert a metal insert nut, which is subjected to a rolling process on the outside of the main body, at the time of molding the resin member, or press-fit after molding. Is being carried out.

[0004]

However, in recent years, in which resource reuse is indispensable from the viewpoint of resource saving and environmental conservation, the above-mentioned inserts in the prior art are not used.
The tonut cannot be easily removed from the resin member,
It was difficult to separate metal and resin, and it was difficult to reuse both resin and metal. In the above-mentioned conventional technology, the image forming apparatus conveys the recording paper and the original document through a common conveyance path, so that the image on the original document is read. Since the reading operation and the image forming operation on the recording paper cannot be performed at the same time,
There is a drawback that it takes a relatively long time to read one original image and form such an image on a recording sheet.

Therefore, an object of the invention described in claim 1 of the present application is to obtain a fastener which can be easily removed from a resin member in order to promote the reuse of resources. When the fastener according to the first aspect of the invention is used, the fastener itself fitted to the resin member as the base material may be loosened when the component is removed. Therefore, the invention according to claim 2 of the present application solves the problem when the fastener according to the invention of claim 1 is used, and maintains the removability of the fastener repeatedly,
It is an object of the present invention to provide a fastening method that effectively achieves the desired purpose of the fastener according to claim 1.

[0006]

In order to achieve such an object, the present invention has a head portion that engages with a mounting tool and a female screw portion formed on the inner diameter side of the main body, and the main body has the female screw portion. The fastener is configured to be fitted to the base material while forming a female screw in the base material having a tightening direction that is the same as the tightening direction. Further, when the fastener is used, the member to be fastened to the base material is attached in the same direction as the attachment direction of the fastener.

[0007]

EXAMPLE An example of the present invention will be described. Figure 1
FIG. 4 is a top view of the fastener of one embodiment according to the present invention.
FIG. 2 is a side view of a fastener according to an embodiment of the present invention. FIG. 3 is a sectional view of a fastener according to an embodiment of the present invention. FIG. 4 is a state diagram showing a state in which another member to be fastened is fastened to the resin member by using the fastener of one embodiment according to the present invention.

On the outer diameter portion of the fastener 1, a thread 3 similar to a Class 4 self-tapping screw defined by JIS is formed. Further, three kinds of internal threads 7 defined by JIS are formed on the inner diameter portion. The upper surface, that is, the screw head is formed with a cross-shaped groove 2 for engaging with a mounting tool. It should be noted that the groove does not necessarily have to be a cross shape, and can be formed into a "-shape", a "hexagonal shape", or the like according to a mounting tool.

The internal thread 7 of the inner diameter portion is tightened in the same direction as the thread 3 of the outer diameter portion.

When the fastener 1 is fitted into the resin member 4, rotation is given to the resin member 4 by using a tool such as a screwdriver (not shown) that engages with the cross-shaped groove 2 of the head. Tap while advancing in the axial direction of the pre-drilled hole 8 and stop when a predetermined tightening torque is reached.

When the member to be fastened 5 is mounted, as in the case of the conventional insert nut, the fastening screw 6 is driven by the female screw portion 7 provided on the inner diameter of the fastener through the hole made in the member to be fastened 5. Use a bar or the like to fix it.

When the fastener is removed from the resin member, it can be easily removed by performing the operation opposite to the above-described fitting operation.

When the fastening screws 6 are loosened, the fasteners may loosen because the fastening directions of the fasteners are the same, but in order to prevent such a situation, the fastening torque of the fasteners should be tightened. The tightening torque of the machine screw should be set.

By fastening the member to be fastened in the same direction as the direction of attachment of the fastener to the resin member, even if the fastener begins to loosen, the member to be fastened restricts the movement in the pull-out direction. It is possible to prevent a situation where the player gets out earlier.

[0015]

As described above, according to the invention of claim 1, when the member to be fastened is fastened to the resin member,
The fastener can be fastened without loosening the fitting condition with respect to the resin member, and can be easily removed when it is necessary to remove the fastener from the resin member. Further, according to the invention of claim 2, since the member to be fastened is fixed from the same direction as the mounting direction of the fastener of claim 1, when the member to be fastened is removed, the fastener is loosened for the first time. It is possible to regulate the movement in the slip-out direction.

[0016]

[Brief description of drawings]

FIG. 1 is a top view of a fastener according to an embodiment of the present invention. FIG. 2 is a side view of a fastener according to an embodiment of the present invention. FIG. 3 is a sectional view of a fastener according to an embodiment of the present invention. FIG. 4 is a state diagram showing a state in which another member to be fastened is fastened to the resin member by using the fastener of one embodiment according to the present invention.

[0017]

[Explanation of symbols]

 1 Fastener 2 Cross-shaped groove 3 Screw 4 Resin member 5 Fastened member 6 Fastening screw 7 Female screw part 8 Hole part

Claims (2)

[Claims] 1. A base material having a female screw portion formed on an inner diameter side of a main body, the head portion engaging a mounting tool, and the main body having a female screw portion having a tightening direction which is the same as a tightening direction of the female screw portion. A fastener, characterized in that the fastener is formed while being fitted to the base material. 2. The fastening method using the fastener according to claim 1, wherein the member to be fastened to the base material is attached in the same direction as the attachment direction of the fastener. [0001]