JP2003013926A - Fitting screw for corrugated plate made of polyvinyl chloride or polycarbonate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting screw for a corrugated plate made of polyvinyl chloride or polycarbonate preventing cracks on them which happen to arise after use of conventional fitting screws for corrugated plate. SOLUTION: A cutting blades 2 having a shape capable of opening a larger hole than the outer diameter below the neck by the rotation of a screw in polyvinyl chloride or polycarbonate corrugated plate is formed in the screw 1 and a washer 3 and a packing 4 are combined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a corrugated plate mounting screw used to fasten a vinyl chloride or polycarbonate corrugated plate to a support member.

[0002]

2. Description of the Related Art A corrugated plate mounting screw which has been conventionally used is composed of a screw 5, a washer 3 and a packing 4 as shown in FIG. 2, which is screwed into a PVC or polycarbonate corrugated plate and simultaneously punched. It is used by being screwed into the support member.

[0003]

When screwing is started by using such a conventional corrugated plate mounting screw, first, a corrugated plate made of vinyl chloride or polycarbonate is screwed by making a hole corresponding to the outer diameter of the thread. The fastening is completed by being screwed into the support member. In this case, since the PVC or polycarbonate corrugated plate has only holes corresponding to the outer diameter of the screw thread, it is fixed to the support member with almost no play. Therefore, the PVC or polycarbonate corrugated sheet contracts due to the passage of time or the temperature change after the completion of fastening, and if this contraction is large, the PVC or polycarbonate corrugated sheet and the lower part of the screw will be unreasonably tightened. PVC or polycarbonate corrugated sheet, which is inferior in strength to the area under the neck, causes cracking.

To prevent this cracking, it is possible to make a large pilot hole in the corrugated sheet made of vinyl chloride or polycarbonate in advance to make a play and then screw in the conventional corrugated sheet mounting screw, but the working efficiency is very high. bad. Therefore, it is customary that such an underdrilling operation is not performed during the actual fastening operation.

An object of the present invention is to provide a PVC or polycarbonate corrugated plate mounting screw capable of preventing cracking of a PVC or polycarbonate corrugated plate without deteriorating work efficiency.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to, at the same time as screwing, make a hole larger than a screw neck outer diameter in a vinyl chloride or polycarbonate corrugated plate to provide a vinyl chloride or polycarbonate corrugated plate and a screw neck portion. This is achieved by providing a play between the two and then screwing it into the support member as it is to provide a corrugated plate mounting screw made of vinyl chloride or polycarbonate that can complete the fastening.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the blade 2 is formed at a position slightly below the neck of the screw 1 with a margin larger than the sum of the thickness of the washer 3, the thickness of the packing 4, and the thickness of the corrugated sheet made of vinyl chloride or polycarbonate. The shape of the blade 2 in FIG. 1 is a triangular wing shape. The screw 1 having the blade 2 and the washer 3 and the packing 4 incorporated therein is the PVC or polycarbonate corrugated plate mounting screw of the present invention.

FIG. 2 shows a corrugated plate mounting screw which has been conventionally used. When this corrugated plate mounting screw is screwed in, a hole for the outer diameter of the thread is made in the corrugated plate made of PVC or polycarbonate. Therefore, when fastened to the support member, there is almost no play between the screw neck portion and the PVC or polycarbonate corrugated plate.

On the other hand, in the case of the PVC or polycarbonate corrugated plate mounting screw of the present invention, at the same time as the screwing, the blade 2 opens a hole larger than the screw neck outer diameter in the PVC or polycarbonate corrugated plate by the rotation of the screw. You can So even if the PVC or polycarbonate corrugated sheet shrinks,
Since there is play between the screw neck and the PVC or polycarbonate corrugated plate, the PVC or polycarbonate corrugated plate will not break.

The shape of the blade 2 in FIG. 1 is a triangular wing shape, but the role of the blade 2 is to rotate the screw by screwing it into a PVC or polycarbonate corrugated plate, and the outer diameter under the screw neck. To make a bigger hole. Therefore,
It is also possible to change the shape of the blade 2 so as not to have the shape of a triangular wing so as to play this role.

As described above, the point that the blade 2 having a role that the conventional corrugated plate mounting screw does not play is formed in the screw 1 is the main point of the present invention, and there is a technical advance here.

The screw thread shape and the screw tip shape of the screw 1 are the screw thread shape and the screw tip shape for wood when the support member is wood, and the screw thread shape for steel material when the support member is steel. It has a screw tip shape.

[0013]

As described above, the PVC or polycarbonate corrugated plate mounting screw of the present invention is made of PVC or polycarbonate by opening a hole larger than the outer diameter of the screw neck at the same time as screwing. Since a play is created between the corrugated sheet and the lower part of the screw neck, cracking of the PVC or polycarbonate corrugated sheet can be prevented without deteriorating work efficiency.

[Brief description of drawings]

FIG. 1 is a PVC or polycarbonate corrugated plate mounting screw of the present invention.

FIG. 2 is a conventional corrugated plate mounting screw.

[Explanation of symbols]

1 screw 2 blades 3 washers 4 packing 5 Conventional screw

Claims (3)

[Claims] 1. A blade 2 in the shape of a triangular wing is positioned at a position slightly below the screw neck, with a little more than the sum of the thickness of the washer 3, the thickness of the packing 4, and the thickness of the PVC or polycarbonate corrugated sheet. PVC or polycarbonate corrugated plate mounting screw in which washer 3 and packing 4 are incorporated in the formed screw 1. 2. The shape of the blade 2 is changed to a shape in which a hole larger than the outer diameter under the screw neck can be formed in a corrugated plate made of vinyl chloride or polycarbonate by rotating a screw, but not a triangular wing shape. Then, from the bottom of the screw neck, wash this blade with a washer 3
Of the thickness of the packing, the thickness of the packing 4, and the thickness of the corrugated sheet made of polyvinyl chloride or polycarbonate, and the corrugated sheet mounting screw made of vinyl chloride or polycarbonate with the washer 3 and the packing 4 assembled therein. 3. A screw for mounting a corrugated sheet made of vinyl chloride or polycarbonate, wherein the screw thread shape or the screw tip shape is changed according to the support member by the screw according to claim 1 or 2.