JPS6023614A - Tapping screw for light aerated concrete - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a menstrual self-tapping screw used to attach various parts to lightweight aerated concrete.

In recent years, lightweight aerated concrete panels, which have excellent fire resistance and heat insulation properties, have come into widespread use as wall materials for various buildings. However, because lightweight aerated concrete is weaker and weaker than ordinary concrete, ordinary nails and wood screws cannot be used. For this reason, four types of lightweight concrete anchors have been developed, but each type has its advantages and disadvantages.

The present invention was made in view of the current situation, and an object of the present invention is to provide a lightweight aerated concrete tapping screw that can be easily and reliably coated onto lightweight aerated concrete and has a large holding force. do.

In other words, the tapping screw of the present invention is made of a hard plastic material, and has a shaft portion that is continuous to one head and includes a large diameter portion, followed by a narrow diameter portion and a sharp portion.

A screw thread is provided over the entire length of the shaft portion, the apex angle of which is more acute than that of a normal screw thread, and the height of the screw thread gradually decreases at the pointed portion.

Hereinafter, embodiments of the F1 present invention will be described based on the drawings. The self-tapping screw 10 according to the present invention, shown in FIG. The shaft portion 2 to be installed consists of a large diameter portion 3, a narrow diameter portion 4 following the large diameter portion 3, and a sharp portion 6 formed at the tip of the narrow diameter portion 4.
is provided. The thread 6 has an apex angle α of approximately 30°.
It is formed at an acute angle, and has the same outer diameter from the large diameter part 3 to the small diameter part 4, and the height of the thread 63 of the sharp part 6 gradually decreases. Therefore, as is clear from the drawings, the height of the thread 61 of the large diameter portion 3 is lower than that of the thread 62 of the small diameter portion 4.

For example, as shown in FIG.
used for attaching. Usually, a metal mesh 12 made of wire is embedded in the center of the lightweight cellular concrete panel 11 for reinforcement.

Tapping screws 10 are attached to the lightweight aerated concrete panel 11.
When screwing on the panel, first, the sharp portion 5 is thrust into the panel 11 to determine the center, and then the entire panel is rotated and press-fitted. At this time, although the sharp portion 5 of the shaft portion 2 screwed into the spring/I/11 rarely comes into contact with the reinforcing metal mesh 12 as shown in FIG. It enters the metal mesh 12 by pushing it laterally. Then, the pores formed by the small diameter part 4 and its thread 6□ are connected to the large diameter part 3.
and the screw thread 61 is screwed in. therefore,
The pores drilled by the small diameter part 4 are pushed and expanded by the large diameter part 3, and as a result, the large diameter part 3 and its thread 61
is strongly held in the concrete, resulting in a large holding force.

FIG. 4 shows an embodiment in which a metal machine screw 7 is used in place of the head 1. In this case, the shaft portion 2 and the thread 6 are integrally molded, and a mounting hole 8 is provided at the end of the large diameter portion 3.
The screw shaft 72 of the machine screw 7 is screwed into the mounting hole 8 through the washer 9 to integrate the shaft 2 and the machine screw 7, and the head 71 of the reader screw 7 is connected to the head 1 of the touch screw 10. That is.

With this structure, the two heads 1 can be made extremely small, which is effective in cases where it is inconvenient or undesirable for the tapping screw 100 head 1 to be exposed by the part 3 attached to the spring/I/11.

Furthermore, if the machine screws 7 and washers 9 are made of stainless steel, they have good corrosion resistance and are suitable for attaching interior materials and exterior walls of buildings.

Since the tapping screw of the present invention has the above-mentioned configuration,
Easy and reliable installation on lightweight aerated concrete.
Moreover, it has the effect of providing a large holding force.

[Brief explanation of drawings]

FIG. 1 is a front view of a self-tapping screw according to the present invention. FIG. 2 is a partially longitudinal front view of the same usage state, FIG. 8 is an enlarged view of the same hair part, and FIG. 4 is a longitudinal front view of the main part showing another embodiment. 1-11 head part 2-m-shaft, part 3, -m-large diameter part 4-m-small diameter part 5---pointed part 6---threaded thread 7---metal machine screw 9 -11 Metal 10---Tapping screw 11-11 Lightweight aerated concrete nozzle 12
-m-Metal mesh 13-m-Exterior material (interior cover) Patent applicant Shinshiro Seisakusho Co., Ltd. Figure 1 Figure 4

Claims (1)

[Scope of Claims] t. The shaft part made of a hard plastic material and connected to the head part consists of a large diameter part, a narrow diameter part and a sharp part that follow this, and the shaft part has a small apex along the entire length thereof. A self-tapping screw for lightweight cellular concrete, characterized in that a screw thread is provided with corners formed at sharper angles than normal threads, and the height of the thread gradually decreases at the sharpened portion. 2. Claim 1, wherein the head is a metal machine screw, and the head is formed by screwing the screw shaft of the machine screw into the large diameter part through a washer. Tapping for lightweight aerated concrete. 3. The tapping screw for lightweight cellular concrete according to claim 2, wherein the front handle screw and the washer are made of stainless steel.