JPH0467043B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an insert tool that is embedded in various mounting base materials and expands in diameter within a hole to prevent it from coming out.

[Conventional technology]

The inventor of the present invention has already filed Japanese Patent Application No. 63-57285 for an insert tool shown in FIG. 4 for embedding in a hole in a mounting base material. The insert device of Japanese Patent Application No. 63-57285 has a rear folded portion 2' formed at the rear of a cylindrical body 1', and a protrusion 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. In this case, the cylindrical body 1' is inserted into the hole of the mounting base material, and the driving body 3' is driven into the cylindrical body 1', and the rear folded part 2' of the rear part of the cylindrical body 1' is pushed outward by the driving body. After that, the bolts were screwed together using the internal threads 15 formed on the inner surface of the cylindrical body 1' to attach the mounting material.

[Problem to be solved by the invention]

However, in the case of the above-mentioned one, a protrusion is made to protrude from the inner surface of the metal plate by pressing, and the female threaded part 15 is formed.
For this reason, the accuracy of the female threaded portion 15 is poor, and there have been cases where the screwing with the bolt is not successful.

The present invention was invented in view of the problems of the conventional examples, and its purpose is to:
To provide an insert tool which can be reliably screwed into a bolt even though it is formed into a cylindrical body by bending a metal plate.

[Means to solve the problem]

The insert tool of the present invention has a cylindrical body 1 formed by bending a metal plate, and a rear folded part 2 at the rear part.
The inner diameter of the rear part of the cylindrical body 1 provided with the rear folded part 2 is made smaller than the inner diameter of other parts, and the rear part of the cylindrical body 1 is driven into the rear folded part 2 of the cylindrical body 1. A driving body 3 for pushing the folded part 2 outward is inserted, a female threaded cylinder 4 is installed inside the cylindrical body 1 in front of the driving body 3, and a front part is inserted into the front end of the cylindrical body 1. It is characterized in that a folded part 8 is provided and this front folded part 8 serves as a retaining part 5 for preventing the female threaded cylinder body 4 from coming off, and by adopting such a configuration, This achieves the above-mentioned object of the present invention.

[Effect]

Therefore, in the present invention, a female threaded cylinder 4 is installed inside the cylinder body 1 formed by bending a metal plate in front of the driving body 3, and a female thread cylinder is provided at the front end of the cylinder body 1. By providing a retaining portion 5 to prevent the body 4 from coming off, the bolt 6 can be reliably screwed in even if the cylindrical body 1 is formed by bending a metal plate.

〔Example〕

The present invention will be described in detail below based on embodiments shown in the accompanying drawings.

The cylindrical body 1 is constructed by bending a metal plate into a cylindrical shape and forming a seam joint 7 in which the side edges of the bent metal plate are joined together by a seam joint. A plurality of cuts are made in the rear part of the cylindrical body 1 from the rear end, and a portion surrounded by the cuts is folded back to form a rear folded part 2.
This rear folded part 2 is folded back twice or more, but it may be folded outward or inward, but in any case, the outer surface of the rear folded part 2 is the outer surface of the cylindrical body 1. The inner diameter of the rear folded portion 2 is smaller than the inner diameter of the other portions of the cylindrical body 1. 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. An internally threaded cylinder 4 is installed in front of the body 3. This internally threaded cylinder 4 is installed so that it can move freely in the front and rear directions 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 that is more than a quadrangle, and making the outer shape of the female threaded cylindrical body 4 a polygonal shape that is more than a quadrangle that corresponds to the inner periphery shape of the cylindrical body 1, the female threaded cylindrical body 4 can move back and forth with respect to the cylindrical body 1, but cannot rotate. A female threaded cylindrical body 4 is attached to the front end of the cylindrical body 1.
A retaining portion 5 is provided to prevent the retainer from coming off. In the embodiment shown in the attached drawings, this retaining part 5 is formed by forming a front folded part 8 at the front end of the cylindrical body 1, and the outer surface of this front folded part 8 is The retaining portion 5 is formed by making the inner diameter of the front folded portion 8 flush with the outer surface of the portion and smaller than the inner diameter of the other portion of the cylindrical body 1. Here, the female threaded cylinder 4 is provided with a tapered part 4a whose diameter becomes smaller toward the front.
When the female threaded cylinder 4 is pulled forward, the female threaded cylinder 4 is fitted into the inner circumference of the front folded part 8 which is the retaining part 5, and the front folded part 8 is expanded outward and the female thread is tightened. The cylindrical body 4 bites into the front folded portion 8 to prevent it from coming off forward.

However, the insert tool A having the above configuration
is inserted into the hole 10 drilled in the mounting base material 9, which is the member to be mounted, as shown in FIG. 3a. Then, as shown in FIG. 3b, the driving body 3 is pushed rearward to fit the driving body 3 into the rear folded part 2, and as a result, the rear folded part 2 is expanded outward and the mounting base is inserted. By biting into the inner wall of the hole 10 of the material 9, the insert tool A is firmly embedded in the hole 10 of the mounting base material 9. Here, in order to press the driving body 3 backward, insert a rod-shaped jig from the front opening of the cylindrical body 1, apply this jig to the front surface of the internally threaded cylindrical body 4, and in this state press the jig. When a striking force is applied, the internally threaded cylinder 4 moves rearward, and the driving body 3 is pressed rearward via this internally threaded cylinder 4. Next, with the bolt 6 inserted into the hole 12 of the mounting member 11, the bolt 6 is screwed into the female thread cylinder 4, and by rotating the bolt 6 in this state, the female thread cylinder 4 is pulled forward, and the female thread cylinder The body 4 pushes the front folded part 8 outward and bites into the inner wall of the hole 10, and also causes the female threaded cylinder 4 to bite into the front folded part 8 to prevent the female threaded cylinder 4 from coming off forward. This allows the attachment member 11 to be attached as shown in FIG. 3c.

In the above embodiment, a single metal plate is bent to form the cylindrical body 1, and 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 .

Note that the insert tool A of the present invention can be attached to various mounting base materials 9 such as concrete, aluminum, wood, hard synthetic resin, soft synthetic resin, particle board, etc., but it is particularly suitable for hard mounting base materials 9 such as concrete. suitable for

〔Effect of the invention〕

In the present invention, a female threaded cylinder is installed in front of the driving body inside the cylinder formed by bending a metal plate as described above, and the female threaded cylinder is inserted at the front end of the cylinder. Since a retaining part is provided to prevent the metal plate from falling out, by bending the metal plate to form a cylindrical body, it is possible to easily form the cylindrical body by pressing, but it is also possible to bend the metal plate. Although the cylindrical body is formed by forming a cylindrical body, the bolt can be securely screwed into the internally threaded cylindrical body inside the cylindrical body, and the rear part of the cylindrical body can be screwed into the cylindrical body. A driving body that is driven into the folded part to push the rear folded part outward is inserted, a female threaded cylinder is installed inside the cylindrical body in front of the driving body, and a screw is inserted into the front end of the cylindrical body. The front folded part is provided as a retaining part to prevent the internally threaded cylinder from coming off, so the driving body is pressed backward and the rear folded part is expanded outward to tighten the inner wall of the hole. In order to bite into the cylindrical body, insert a rod-shaped jig from the front opening of the cylindrical body, apply it to the front surface of the internally threaded cylindrical body installed in front of the driving body inside the cylindrical body, and in this state, strike the jig. The internally threaded cylinder is moved rearward, and the driving body is pushed backward through this internally threaded cylinder, thereby pushing the driving body backward and pushing the rear folded part outward to bite into the inner wall of the hole. Moreover, in this case, there is no need to strike the driving body with the jig while passing the jig inside the female threaded cylinder. There is no risk of damaging the internally threaded part of the body, and the rear folded part of the cylindrical body bites into the inner wall of the hole by the driving element, and the female threaded cylindrical body is rotated forward by screwing the bolt into the internally threaded cylindrical body. The part folded part is made to bite into the inner wall of the hole, and the rear folded part and the front folded part are made to bite into the inner wall of the hole at the front and rear ends of the cylindrical body, and can be firmly embedded and fixed in the hole. .

[Brief explanation of drawings]

Fig. 1 is a perspective view of the present invention, Fig. 2 is a sectional view of the same as above, Fig. 3 a, b, and c are sectional views showing the construction order of the above, and Fig. 4 is an exploded perspective view of conventional examples a and b. and a perspective view, 1 is a cylindrical body, 2 is a rear folded part, 3 is a driving body, 4 is a female threaded cylindrical body, and 5 is a retaining part.

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 inside the cylindrical body. A driving body is inserted into the rear folded part of the cylindrical body to push the rear folded part outward, and a female threaded cylinder is installed inside the cylindrical body in front of the driven body. An insert tool characterized in that a front folded part is provided at the front end of the insert, and the front folded part serves as a slip-off prevention part for preventing the female threaded cylinder from coming off.