JPS5818496Y2 - Insert tool for hanging concrete ceiling - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a concrete ceiling suspension insert tool that is embedded in the lower surface of a concrete ceiling in order to suspend various pipes, wiring, equipment, etc. from the concrete ceiling.

Conventionally, this type of insert tool is constructed by attaching a mounting plate with claws for attaching to the concrete formwork by caulking or other means to the lower end of the internally threaded cylindrical body into which the hanging tool is screwed. , production was troublesome and costly.

Further, since the claws are formed by partially cutting and bending a thin mounting plate, the claws have insufficient strength and are often bent or damaged when being hammered into the formwork.

In addition, there are models in which the main body is made of cast metal and separate nails are integrated into the main body when the main body is cast, but the main body is fragile and sometimes breaks easily when nailed into the formwork, making it unsuitable for practical use. .

In view of the above points, the present invention aims to provide an insert tool for hanging a concrete ceiling that is easy to manufacture, can be manufactured at low cost, and has sufficient strength.

The feature of this invention is that it consists of a cylindrical body with a head and a female thread, and a mounting part for the concrete formwork. The present invention resides in an insert tool for hanging a concrete ceiling, which comprises horizontal seat pieces arranged alternately in the circumferential direction and integrally connected to the lower part of the main body in the form of split pieces.

Embodiments of the present invention will be described below with reference to the drawings.

1 is the insert tool body, with a head 11 at the upper end. It has a cylindrical shape with a head and a female thread 12 on the inner surface, and a plurality of vertical claw pieces 21 with sharp tips and a horizontal seat piece 22 are provided at the bottom of the main body 1. The insert tool A according to the present invention is constituted by integrally arranging the mounting portion 2 consisting of the following.

This insert tool A is manufactured by a series of press processes as follows.

FIG. 3A shows a headed cylindrical body A' as a raw material for this insert A.

This cylindrical body A' is formed by header processing a round bar material of a predetermined length, and integrates a body forming part 1' in which a female thread 12 will later be carved and a mounting part forming part 2'. have.

The mounting portion forming portion 2' is formed to have a thinner wall thickness than the main body forming portion 1' in order to facilitate splitting and bending.

First, as shown in the opening of Figure 3, the attachment part forming portion 2' is divided into two types of split pieces 21', narrow width and wide width.
, 22' are split so that they are formed alternately in the circumferential direction, and the wide split pieces 22' are bent outward in an inclined shape (approximately 45').

This split piece 21'. The number of 22' is not particularly limited, but as shown in the figure, about three each is suitable.

Such splitting and preliminary bending can be performed simultaneously by a pressing process.

Next, as shown in FIG. 3, the wide split pieces 22' pre-bent into an inclined shape in the above step are further bent into a horizontal position.

Thereby, seat pieces 22... are formed.

After this, as shown in FIG. 32, the so-called tip attachment in which the tips of the vertical narrow split pieces 21' are sharply cut off is processed.・・・・・・
is formed, and in the final step, a female thread 12 is carved on the inner surface of the main body forming portion 1'.

In this way, the main body 1 and the plurality of vertical claw pieces 21...
. . . and a mounting portion 2 consisting of a horizontal seat piece 22 . . . are integrally molded.

When inserting this insert tool A into a concrete ceiling, place it on the top surface of the concrete formwork 3 with the main body 1 facing upward, and tap it from above to insert the claw pieces 21...
- is nailed to the formwork 3, and the seat pieces 22 are brought into close contact with the upper surface of the formwork.

In this state, concrete 4 is poured, and after the concrete hardens, the formwork 3 is removed, and the insert tool A is embedded in the lower surface of the concrete ceiling 4 with the lower surface of the main body 1 open.

Then, a hanging tool (not shown) is screwed and fixed to the main body 1 of the insert tool A.

Note that the claw pieces 21 may be bent horizontally by hitting them when the formwork 3 is removed, but there is no particular need to bend them.

As described above, according to the present invention, since the main body and the mounting part are integrally molded, manufacturing is extremely simple, mass productivity is improved, and both material costs and processing costs are reduced, resulting in a significant cost reduction. sell.

In addition, since the claws on the mounting part are integrally formed with the main body and have an arcuate cross section, they are much stronger than conventional claws that are cut and raised on a plate. This method is extremely useful in practice, as there is no risk of damage or bending.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an insert according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the same, Fig. 3 is a manufacturing process diagram of the insert, and Fig. 4 is a cross-sectional view showing the same usage state. . A... Insert tool, A'... Headed cylindrical body as material, 1... Main body, 11...
...Head, 12...Female screw, 2...
Mounting part, 21...Claw piece, 22... Seat piece.

Claims (1)

[Scope of utility model registration request] It consists of a cylindrical body with a head and a female thread, and a mounting part for the concrete formwork. An insert tool for hanging from a concrete ceiling, characterized in that it is arranged in a continuous manner as a split piece at the bottom of the main body.