JP2689943B2 - Insert metal fitting and its mounting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert metal fitting and a method of attaching the insert metal fitting to be inserted into a plastic molded product by the insert method after molding, and particularly, a joint strength between the plastic molded product and the insert metal fitting is required. The present invention relates to an insert fitting and a method for mounting the insert fitting.

[0002]

2. Description of the Related Art A conventional insert fitting has been inserted into a prepared insert hole of a plastic molded product by a post-molding insert method such as a heat press fitting / expansion method.

For example, FIG. 3 is a view showing the structure of a conventional insert fitting.

In the figure, reference numeral 12 is a mounting member such as synthetic resin or putty, in which the insert metal fitting 1 is embedded. The bolt member 10 is screwed into the insert fitting 1 to connect the other member 14.

In this insert fitting, an internal thread portion 2 for screwing the bolt member 10 is formed on the inner surface, and at least the tip end portion in the screwing direction of the bolt member 10 is divided into a plurality of divided pieces 5 and the divided pieces. An inner surface of the portion where 5 is formed has a tapered surface 6 whose diameter gradually decreases toward the end.

As a result, the joining strength has been ensured.

The structure described above is, for example, an actual flat plate 5-
Details are described in Japanese Patent No. 58267.

[0008]

In this conventional insert metal fitting, since the physical connection with the insert surface of the insert metal fitting of the plastic molded product can be achieved only by the physical contact with the contact surface of the knurled portion of the insert metal fitting, the insert metal fitting is provided. To increase the screw tightening torque value, the insert metal fittings were lengthened or the outer shape was thickened.

Therefore, there is a problem that it is necessary to select a screw according to the type of insert fitting and to adjust a screw tightening torque value.

[0010]

Since the insert metal fitting of the present invention is provided with a thermosetting adhesive, when the insert metal fitting is heated and press-fitted into the insert metal fitting prepared hole of the plastic molded product, the insert metal fitting is inserted. The thermosetting adhesive applied to the metal fittings comes into contact with each other to obtain a stronger bond with the prepared hole of the plastic molded product, thereby preventing the insert metal fitting from coming off and improving the screw tightening torque strength.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing a structure in which the insert fitting of the present invention is embedded in a concave synthetic resin (plastic) material.

In the figure, reference numeral 12 is a mounting member, which is made of plastic and has a cylindrical shape in accordance with the insert fitting of the present invention.

The insert fitting embedded in the above-mentioned mounting member 12 of the present invention has a knurled portion 2 consisting of two layers.
1 and 22 and two layers of thermosetting adhesive parts 23 and 24 applied between the knurled parts 21 and 22 and between the contact part 25 and the knurled part 22.

FIG. 2 is a sectional view showing the shape of the insert fitting. The knurled portions 21 and 22 enhance the frictional force of the knurls by making the cutting directions of the knurls mutually opposite.

The thermosetting adhesive parts 23 and 24 adhere the knurled parts 21 and 22, respectively, and the knurled part 22 and the abutting part 25.

For the thermosetting adhesives 23 and 24, for example, epoxy adhesives may be used.

Further, in this figure, the knurled portion and the thermosetting adhesive portion have two layers, but the present invention is not limited to this, and a larger number of layers can be provided to enhance the adhesive strength. Of course you can.

The invention will be described again with reference to FIG.

The insert metal fitting as shown in FIG. 2 is heat-pressed by the heat-pressing jig 20 into the insert-inserting mounting member 12 of the plastic molded product by the insert method.

As a result, the thermosetting adhesive portions 23 and 24 applied to the insert fitting are brought into contact with each other by the heat of the heat press fitting jig 20 to firmly join the insert insert welding attachment member 12 of the plastic molded product and the insert fitting. Will be made.

The temperature of the heat press fitting jig 20 is about 80-9.
If the temperature is kept at 0 ° C, the normal thermosetting adhesive temperature is about 80 ° C, so that the thermosetting adhesive can be sufficiently contacted. Further, since the temperature of the heat press fitting jig 20 is considerably lower than the contact temperature of the plastic molded product 12 of about 250 ° C., there is no problem that the plastic molded product itself is structurally affected.

Regarding the heat press-fitting of the heat press-fitting jig 20, as shown by the arrow in FIG. 1, the entire insert fitting is weighted from above.

[0024]

As described above, according to the present invention, since the insert fitting by the post-molding insert method and the insert insertion prepared hole of the plastic molded product can be firmly joined, the insert fitting having excellent durability and improved screw tightening torque strength. Have the effect that can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of attachment of an insert fitting of the present invention.

FIG. 2 is a cross-sectional view of the insert fitting shown in FIG.

FIG. 3 is a sectional view of a conventional insert fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insert metal fitting 2 Female screw part 4 Cutting part 5 Divided piece 6 Tapered surface 8 Annular recess 10 Bolt member 12 Mounting member 12a hole 14 Other member 20 Heat press fitting jig 21, 22 Knurling part 23, 24 Thermosetting adhesive part Addressing part with 25

Claims (4)

(57) [Claims] 1. An insert fitting embedded in a concave mounting member made of a synthetic resin such as plastic, and a knurled portion formed by cutting knurls into a plurality of tubular fittings.
A thermosetting adhesive applied between the plurality of knurled parts, and an outermost part of the knurled part and an abutting part adhered by the thermosetting adhesive. Insert metal fittings. 2. A method of mounting an insert fitting in a concave mounting member made of a synthetic resin such as plastic, wherein the insert fitting is heat-treated between a plurality of knurled parts formed by cutting knurls in a tubular fitting. A curable adhesive is applied, and the outermost portion of the knurled portion and the contact portion are formed by adhering with the thermosetting adhesive. After the insert fitting is attached to the attachment member, An insert fitting method, wherein the insert fitting is attached to the mounting member by weighting with a heat press fitting jig. 3. The insert fitting according to claim 1, wherein the knurled portions have different knurl cutting directions alternately. 4. The knurled parts are alternately rolled.
Claims characterized by different cutting directions
The method of attaching the insert fitting according to item 2.