JPS58156710A - Head-section coating screw - 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 an improvement in a head-covered screw, which is formed by integrally molding and covering the head of a screw body made of gold 14 with a plastic cover.

Screws used to attach roof boards, wall boards, and other exterior materials of various buildings and structures (this type of screw has a drill part at the tip of the young part, and is used for drilling, tapping, and fastening). (often used because it has three functions and is easy to construct on-site) requires corrosion resistance and V-proofing properties against wind and rain because a portion is exposed to the outside.

Various types of screws have been proposed in which a part of the metal screw body is integrally coated with a plastic body to provide corrosion resistance. Partially covered screw thread 1, which has both corrosion resistance and sealing properties, extends to the head seat side to form a seal washer part 1, for example, U.S. Pat.
It is disclosed in No. 7111da and the specification of No. 3 Otsuri 3IIri No. 5 of the same and is publicly known.

In the case of the above-mentioned head-supported screw, a part of the metal screw main body is entirely molded with a plastic covering, and a rotary tool is secured to the molded head of the nine-piece snack formed by the covering. A department has been set up.

When tightening with a rotary tool, torque is transmitted to the head of the screw body via the plastic molded head. Therefore, the plastic molded head needs to have the strength to withstand the torque when tightened with a rotating tool.
For this reason, a hard plastic material is used for the covering. However, even with hard plastic materials, it is difficult to obtain a torque strength comparable to that of the metal head of the screw body. Kakinaba quadrilateral,
/Using a one-rotation tool, #+tf is made into a special shape with a square-cornered polygonal shape and a large number of grooves extending in the axial direction.
f) *z” “li! 111t+"111 static 615, and increase the torque resistance.

However, if the retaining part of the rotary tool is made into this round shape, it is inconvenient that a general-purpose rotary tool equipped with a hexagonal wrench or a cross-shaped pit cannot be used.

Furthermore, when the covering body is molded from a hard plastic material, the covering body can be extended to a part of the screw body toward the seat surface, as in the case of the bridge-coated screw disclosed in the above-mentioned US patent specifications. When the seal 7721 member is formed, the elasticity of the seal washer member is insufficient and deterioration of the sealing function is unavoidable.

In particular, when the screw body is a drill screw or self-tapping screw,
Since the work is carried out on-site using a handle tool, the screw shaft center is often tilted with respect to the object to be fastened during tightening, creating a gap between one side of the splinter seat and the object to be fastened. The seal washer member made of plastic material is completely V-A'll*! There is one drawback that can be avoided. Therefore, it is difficult to say that the above-mentioned 0I11 part covered screw truly has both V-ru property and corrosion resistance.

The present invention has been developed in light of the above-mentioned current situation, and has nine screws.It is an object of the present invention to provide a top machine screw having excellent y + A/ properties and sufficient corrosion resistance as necessary. .

Another object of the present invention is to provide 111 which can be attached by a general-purpose turning tool and which has both V-ruability and corrosion resistance.
This is a joint that provides a partially covered screw.

In order to achieve the above object, the present invention provides that a plastic covering integrally molded and coated on a part of a metal screw body is made of a soft plastic material, and The installation is done by drilling the entire outer surface of the rotating tool except for the retaining hole, and at the same time, the covering body extends from the part of the seating surface at and extends toward the scissor seat surface to bring the tool into close proximity to the shank at the 9th position. It is characterized in that a V-washer portion having an annular raised portion is formed.

According to the present invention, the covering body that integrally molds and covers the head of the screw body is made of a soft plastic material with high elasticity, and the part of the seating surface 1Ilvc is made of the soft plastic material. The V-ru washer part is formed by the covering body, and the V-ru washer part has an excellent sealing property, and in particular, the seal part 7729 has a Kj-shaped protuberance at nine positions close to the shank of the screw body. Because I'm doing it,
Even if the shaft center of the screw body is bent with respect to the object to be shafted when the screw is fastened, there is an effect that reliable sealing performance can be exhibited.

In addition, since the retaining hole for the rotary tool provided in a part is not covered by the covering, the screw body can be directly tightened using a general-purpose rotary tool, which is very convenient for use. . Moreover, since the entire outer surface of the head except for the retaining hole and the seat rkJ1111 are molded and covered by the covering, it has sufficient corrosion resistance, and in particular, it has sufficient corrosion resistance to prevent corrosion of some parts of the screw. This can prevent the electrical contact effect caused by the potential difference between the screw head and the object to be fastened. It should be noted that corrosion caused by partially exposing the retaining hole is extremely slight and does not make it difficult to use.

An embodiment of the present invention will be described below based on the drawings. l
The Fi screw body is made of metal material such as steel or iron, and has a thread 3 on the outer peripheral surface.A part 4 is connected to the J end of the 9V yank 2, and a drill part 6 is installed at the bottom of the shank 2. It is provided and formed into a drill screw. The main part of the head 4 has a hexagonal cross section as shown in Figure *4 and Figure @6, and there is a flange V on the seat side.
A retaining hole (cross recess) 7 for a cross screwdriver bit is provided at the top.

A plastic body 8 is integrally formed and coated on the head 4 and is made of a soft plastic material that is easily elastically deformable, such as soft vinyl chloride resin, low-density polyethylene resin, or nylon resin. This covering 8
As shown in Figure %I11 to Figure 8, it covers the entire outward direction of 1ls4 except for the engagement hole 7, and is also polished integrally to the lower part of the bottom part of the flange part 6. A seal washer part e having an annular raised part 10 is formed at a position close to the v-young 2 in the body part.

FIG. 6 shows a device for molding and covering the body 8 on the piece 4 of the screw body 1, 11 is the lower cover of the injection mold, 12
is superposition. The lower cover 11 has a hole 13 into which the screw 1 and the V-young 2 of the body 1 are inserted, and the opening of the chain hole 13 is provided with a Kll-shaped center protrusion 11s14, and the outer part of the chain hole 13 is provided with a Kll-shaped protrusion 1.
An IIT V chevron-shaped annular groove 16 for forming the IIT 0 is formed. In addition, a bottle 16 is fitted into the upper die 12 so as to be movable in the axial direction, and its distal end surface lea is pressed against the top of the head 4 to close the retaining hole 7. is brought into close contact with the annular protrusion 14 of the lower die 11.

When the soft blastic phase material is injected and molded between the lower mold 11 and the upper mold 12 under this assumption, the covering 8 is molded integrally with the first part 4, as shown in FIGS. 1 to 8. It is covered.

Since the plane part ridge screw of the present invention has the above-mentioned configuration,
It has excellent rolling properties and corrosion resistance, and is convenient because it can be tightened using a general-purpose rolling tool.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the main part of the screw according to the present invention;
Figure 2 shows Kaiping Ifi, Il! Figure 8 is a front view of the main part of the screw body, Figure 6 is a plan view of the main part of the screw body, and Figure W46 is a longitudinal sectional front view of the main part of the forming coating device. It is. 1...Screw body 2...V-young 4...Head 7...Engagement hole 8...・・・・・・Mechanical body e・・・・・・V-Ruwatu V-ya part 10・・・Annular protrusion” part Patent applicant: Shinkyu Seisakusho Co., Ltd. (Figure 1, Figure 2) Figure 3 Figure 4 Figure 51 Figure 6 Procedural amendments (11) 1. Indication of the case 1988 patent application oJiers No. 2. Name of the invention l11m covered screw 3. Person making the amendment Relationship to the case Patent application Person 4, Agent' (1 location, 146-1, North Block, Osaka City, 530)
No. 12 No. 17 Subject of amendment by Chikanobu Bill (Detailed explanation of the invention for steel book O for 1) O line 1 of the present invention...
・Insert the following between 1 and 1. , ``Figures 7 to 2 show another embodiment. In this example, a retaining hole 27 having a hexagonal cross section is provided in a portion 24 of the screw body 21, and a hexagonal wrench engages with the retaining hole 27.
The outer surface of the square forms a polygonal pyramid with each ridge line vc chamfered,
The tip has a tapered κ shape. ” (2) Specification No. ljr last line 1... Longitudinal correct #
This is a diagram J. Correct the statement in 1 as follows. ``......Longitudinal front view, Figure 7 is a positive Eli view of the main part of the screw body according to another embodiment, Figure 1 is a plan view of the same, Figure 2 is a longitudinal cross-section of the bulge of the same completed state of the covering. It is a front view. ”(3)
Figure 7 of Appendix 9 attached to the application. Figure g and 2
Add figures. Applicant for the above patents: Yui Company Shinjo Seisakusho

Claims (1)

[Claims] 1. A metal screw body having a head connected to the upper end of a V-yang having threads on the outer 11 surfaces, and a plastic body being integrally molded and coated on the part of the metal screw body. The screw body is made of a soft disk material and covers the entire outer surface of the screw body except for a retaining hole for a rotary tool provided at the top of the part of the screw body. thl
A partially covered screw, characterized in that a V-Lutzscher portion having an annular ridge starting point is formed at a position close to the V-young by the covering body which is sharpened by Iit and has a length of Km from the seat surface. 2. The partially covered screw according to claim W41, wherein the screw main body is a drill screw having a drill portion at the lower end of the V-young. 6. Claim 1 or w, wherein the head of the screw body has a non-circular cross section and a flange portion on the seat surface.
Partially covered screw according to item 42.