JPH0231014A - Insert - Google Patents

Abstract

PURPOSE:To surely screw a bolt in a female screw tubular body by constituting an insert of a tubular body formed of a bent metal plate, a driving body, the female screw cylindrical body and the bolt. CONSTITUTION:A tubular body 1 formed of a bent metal plate is provided on the end with an anti-drop body 5, and inside with a driving body 3 and a female screw tubular body 4 in which is screwed a bolt 6. The tubular body 1 can be thus simply formed by a press, while the bolt 6 can be surely screwed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to inserts for various attachments that are embedded in a base material and that expand in diameter within a hole to prevent them from coming off.

[Prior Art] The inventor of the present invention has already filed Japanese Patent Application No. 63-57285 for an insert as shown in FIG. 4 for mounting in a hole in a base material. In the insert of this Japanese Patent Application No. 63-57285, a rear folded portion 2' is formed at the rear of the cylindrical body 1', and a protrusion is formed by pressing on the inner surface of the cylindrical body 1', and the protrusion is threaded into a female thread. It was called Division 15. To install this, insert the cylindrical body 1' into the hole in the base material, drive the driving body 3' into the cylindrical body 1', and use the driving body to remove the rear folded part 2' at the rear of the cylindrical body 1'. Push it outward to bite into the inner wall of the hole, and then insert the cylindrical body 1.
The material was attached by screwing a bolt using a female threaded portion 15 formed on the inner surface of the material.

[Problems to be Solved by the Invention] However, in the above-mentioned device, the female threaded portion 15 is formed by protruding a protrusion from the inner surface of the metal plate by pressing, and therefore the accuracy of the female threaded portion 15 is poor. , there were cases where the threading with the bolt did not work properly.

The present invention was invented in view of the problems of the conventional examples, and although its purpose is to bend a tJK plate to form a cylindrical body. First, an object of the present invention is to provide an insert tool that can be reliably screwed into a bolt.

[Means for Solving the Problems] The insert tool of the present invention includes a cylindrical body 1 formed by bending a metal plate, and a cylindrical body 1 having a rear folded portion 2 at the rear thereof. A driving body 3 whose rear part has an inner diameter smaller than that of other parts and is driven into the rear folded part 2 of the cylindrical body 1 to push the rear folded part 2 outward. is inserted into the cylindrical body 1 in front of the driving body 3, and a retaining part 5 is provided at the front end of the cylindrical body 1 to prevent the female threaded cylindrical body 4 from coming off. By adopting such a configuration, the above-mentioned object of the present invention can be achieved.

[Function] According to the present invention, the internally threaded cylinder 4 is inserted in front of the driving body 3 inside the cylinder 1 formed by bending a metal plate, and the front end of the cylinder 1 is inserted. By providing a retaining portion 5 to prevent the internally threaded cylindrical body 4 from coming off, even if the cylindrical body 1 is formed by bending a metal plate, the bolt 6
This makes it possible to securely screw them together.

[Examples] The present invention will be described in detail below based on examples shown in the accompanying drawings.

The cylindrical body 1 is constructed by bending a metal plate into a cylindrical shape and joining the side edges of the bent metal plates to each other by a seam joint to form a seam joint 7. A plurality of cuts are made in the rear part of the cylindrical body 1 from the rear end, and the part surrounded by the cuts is folded back to form a rear folded part 2.

This rear folded part 2 is folded more than twice,
It may be folded outward or inward, but in either case, the outer surface of the folded part 2 is flush with the outer surface of the cylindrical body 1, and the inner diameter of the folded part 2 is The inner diameter of the other portions of the cylindrical body 1 is smaller than that of the other portions. A driving body 3 is inserted into the cylindrical body 1 and is driven into the rear folded part 2 of the cylindrical body 1 to push the rear folded part 2 outward. The internally threaded cylinder body 4 is located in front of the body 3. This internally threaded cylinder 4 is internally movable within the cylinder 1 but cannot rotate. For example, by making the shape of the inner periphery of the cylindrical body 1 a polygonal shape larger than a square, and the outer shape of the female threaded cylindrical body '4 being a polygonal shape larger than a square corresponding to the inner periphery shape of the cylindrical body 1, the female threaded cylindrical body 4 is cylindrical body 1
It can be moved forward and backward, but cannot be rotated. A retaining portion 5 is provided at the front end of the cylindrical body 1 to prevent the female threaded cylindrical body 4 from coming off. This retaining part 5
In the embodiment shown in the accompanying drawings, a front folded part 8 is formed at the front end of the cylindrical body 1, and this front folded part 8
The retaining part 5 is made flush with the outer surface of the other part of the cylindrical body 1 so that the inner diameter of the front folded part BWJ is smaller than the inner diameter of the other part of the cylindrical body 1. It is formed. Here, the female threaded cylinder 4 is provided with a tapered part 4a that has a small diameter at the front. It is fitted into the inner peripheral part of the folded part 8, and as the front folded part 8 is pushed outward, the internally threaded cylinder 4 bites into the front folded part 8 to prevent it from coming off forward. There is.

(The insert tool A having the above-mentioned structure is attached to a member by inserting it into the hole 10 drilled in the base material 9 as shown in FIG. 3(a).And then, as shown in FIG. 3(b) As shown in the figure, the driving body 3 is pressed backward to fit the driving body 3 into the rear folded part 2, and as a result, the rear folded part 2 is spread outward and the mounting is carried out on the base material 9.
By biting into the inner wall of the hole 10 of the base material 9, the insert tool A is firmly attached and embedded in the hole 10 of the base material 9. Here, in order to press the driving body 3 backward, a rod-shaped jig is inserted from the front opening of the cylindrical body 1, and this jig is inserted into the female threaded cylindrical body 4.
When a striking force is applied to the jig in this state, the internally threaded cylinder 4 moves rearward, and the driving body 3 is pressed rearward through the internally threaded cylinder 4. Another method is to insert a jig with a smaller diameter than the hole in the internally threaded cylinder 4 and apply it directly to the front surface of the driving body 3, and in this state, apply a striking force with the jig to drive the jig. The body 3 may be pressed backward. Next, to install the bolt 6, insert it into the hole 12 of the member 11, screw the bolt 6 into the female threaded cylinder 4, and rotate the bolt 6 in this state to draw the female threaded cylinder 4 forward and tighten the female thread. The cylindrical body 4 pushes the front folded part 8 outward so that it bites into the inner wall of the hole 10, and also causes the female threaded cylindrical body 4 to bite into the front bent part 8 to prevent the female threaded cylindrical body 4 from coming off forward. Therefore, the member 11 is attached as shown in FIG. 3(C).

In the above embodiment, the cylindrical body 1 is formed by bending two metal plates, and the both side edges of the cylindrical body 1 are joined by a seam joint. They may be joined by means other than cross-joining. Further, the cylindrical body 1 is divided into a plurality of parts in the circumferential direction, each of the divided members is formed by bending a metal plate, and both side edges of the divided parts are connected to each other to form a cylindrical body 1. It is also possible to form a .

In addition, the insert A of the present invention can be attached to the base material 7 in various ways such as concrete, aluminum, wood, hard synthetic resin, soft synthetic resin, particle board, etc., but it is especially difficult to attach it to hard materials such as concrete. Base material 7
suitable for

[Effects of the Invention] In the present invention, as described above, an internally threaded cylindrical body is provided inside the cylindrical body in front of the driving body inside the cylindrical body formed by bending a metal plate. Since a retaining part is provided to prevent the internally threaded cylindrical body from coming off, by bending the metal plate to form the cylindrical body, the cylindrical body can of course be easily formed using a press. Although the cylindrical body is formed by bending a metal plate, the bolt can be reliably screwed into the internally threaded cylindrical body inside the cylindrical body.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the present invention, Fig. 2 is a sectional view of the same, and Fig. 3 is a sectional view of the same.
Figures (a), (b), and (c) are cross-sectional views showing the construction order of the same as above;
FIGS. 4(a) and 4(b) are an exploded perspective view and a perspective view of a conventional example, in which 1 is a cylindrical body, 2 is a rear folded part, 3 is a driving body, 4 is a female threaded part, and 5 is a retaining body. It is. Agent Patent Attorney Ishi 1) Chief 7 Figure 1 Figure 2

Claims (1)

[Claims] (1) In a cylindrical body formed by bending a metal plate, a rear folded part is provided at the rear part, and the inner diameter of the rear part of the cylindrical body provided with the rear folded part is made smaller than the inner diameter of other parts, and the cylindrical shape A driving body is inserted into the body to push the rear folded part outward by being driven into the rear folded part of the cylindrical body,
An insert tool comprising a female threaded cylinder inside the cylinder in front of the driving body inside the cylinder, and a retaining part for preventing the female threaded cylinder from coming off at the front end of the cylinder. .