WO2005035996A1

WO2005035996A1 - Wood screw for building

Info

Publication number: WO2005035996A1
Application number: PCT/JP2004/014720
Authority: WO
Inventors: Giichiro Muro
Original assignee: Muro Corporation; Kamiyama Tekko-Sho Co., Ltd.
Priority date: 2003-10-07
Filing date: 2004-10-06
Publication date: 2005-04-21
Also published as: JP2005113489A; TW200519298A

Abstract

A wood screw for building suitable for firmly fixing a hard plate material harder than wood materials to a wood bed, comprising a shaft part (2) having threads (21), a head part (3) having a tool hooking part (31) for screwing the shaft part and larger in diameter than the shaft part (2), and a trumpet-shaped neck part (4) expanding in diameter from the shaft part (2) toward the head part. In the threads (21) of the shaft part, the driving side flank angle thereof on the shaft part tip side is formed larger than the extracting side flank angle thereof on the head part side. A plurality of chevron-shaped ribs (42) having blade-like ridges (43) extending from the shaft part to the head part on the surface of the trumpet-shaped neck part (4) are formed on the trumpet-shaped neck part (4). A flat flange part (32) continuously connected to the trumpet-shaped neck part (4) is formed around the head part (3).

Description

Specification

Wood screws for construction

Technical field

The present invention relates to a wood screw for attaching a wall material to a base material, and more particularly, to a wooden base material in a two-by-four method (hereinafter referred to as a 2 × 4 method). The present invention relates to a wood screw for construction that is effective for attaching a hard wall material.

Background art

[0002] Conventionally, in a residential building by the 2X4 method, a wall material is attached to a base made of a wooden material using nails or wood screws to form a wall surface. In recent years, various wall materials for interior use have been developed, and one of them is an oriented 'strand' board in which wood cuttings are oriented in a predetermined shape and pressed with thermosetting resin. (Hereinafter referred to as OSB) has been developed for interior wall materials. In addition, those harder than wood materials, such as various types of particle boards that are connected by OSB, are often used. Since these wood materials are mainly made of wood, they are manufactured by crimping with resin or the like while maintaining the characteristics of wood materials, so they are particularly hard compared to wood materials with a high surface density. If this is fixed with nails on the groundwork, it will be difficult or time-consuming to separate metal nails when repairing buildings or disposing of waste materials when dismantling. In order to facilitate the separation, it is more appropriate to use wood screws. If the interior wall material mentioned above is attached with wood screws sold, the head of the wood screws will be difficult because the wall material is hard. It is difficult to screw the part until it is flush with the wall material surface, and there is a problem that the head surface is lifted by the plate surface force.

[0003] Further, if this is forcibly screwed, the screw thread screwed into the wooden substrate breaks the screw portion of the screw in the substrate, and accordingly the wall material also raises the substrate force, Of the wall material is damaged by the head of the wood screw. Such damage may require repair on its own, and even if it is inconspicuous, it may not be possible to reuse the wall material if the wall material must be reinstalled. 《There is a problem of becoming.

Disclosure of the invention Problems the invention is trying to solve

[0004] The present invention has been made to solve the above-described problem, and an object to be solved is to attach a hard plate material to a wooden substrate more firmly than a wooden material. It is an object of the present invention to provide an architectural wood screw suitable for a vehicle.

Another object of the present invention is to make it possible to easily screw the head of the wood screw until the head is flush with the hard plate material or the head force of the wood screw is slightly reduced. An object of the present invention is to provide an architectural wood screw in which the surface portion of the wood screw is not greatly damaged by the wood screw head.

Another object of the present invention is to provide a wood screw for a building which can be easily separated from a plate material or the like when disposing of waste material at the time of repair or demolition of a building.

Means for solving the problem

[0005] The architectural wood screw of the present invention for solving the above-mentioned problem is a wood screw for architectural use for mounting a hard plate material as compared with a wood material such as a particle board on a wood base, A shaft portion having a thread, a head portion having a tool hook for screwing the shaft portion, having a larger diameter than the shaft portion, and a trumpet shape expanding from the shaft portion toward the head portion. The screw thread of the shaft portion is formed such that the driving side flank angle at the shaft portion tip side is larger than the drawing side flank angle at the head side, and the flared neck portion has a flapper. A plurality of chevron-shaped ribs having a blade-like ridge extending from the shaft portion side to the head side of the surface of the shape, and a flat flange portion connected to a trumpet-shaped neck around the head. It is characterized by

[0006] In a preferred embodiment of the architectural wood screw of the present invention, the driving side flank angle of the screw thread is formed to be 30 degrees, and the extraction side flank angle is formed to be 15 degrees.

In another preferred embodiment of the architectural wood screw of the present invention, the ridge force of the angled rib at the neck is inclined at an equal angle to a direction perpendicular to the central axis of the shaft and at an angle of about 90 degrees. It is formed by the intersection of two mutually intersecting slopes, and four or more ribs are provided at equal intervals around the neck.

Further, in another preferred embodiment of the wood screw for construction of the present invention, the tool hook on the head is formed by a square hole. In the architectural wood screw having the above-mentioned configuration, a flat flange portion is provided around the head portion and connected to the trumpet-shaped neck portion, and further, the flank angle of the screw thread on the shaft portion is pulled out. Since it is larger than the side flank angle, the holding strength of the attached plate material is increased, but the head portion has a shape that is hard to sink due to the plate material due to the flange portion connected to the trumpet-shaped neck portion.

However, since a plurality of chevron-shaped ribs having a blade-like ridge are provided in the neck of the trumpet shape, the ribs cut a portion of the plate material around the trumpet-shaped neck portion when screwed. Thus, the head of the wood screw can be easily screwed in until it is flush with the hard plate or the head is slightly lowered from the plate surface. In addition, the rib also functions to prevent the wood screw from loosening after the wood screw is screwed.

[0008] Furthermore, in the above-mentioned wooden screw for building, since the tool hook for screwing the shaft is formed by a square hole, the tool hook is compared with a screw having a plus or minus screwdriver groove. Therefore, the wood screws can be easily unscrewed when the building is repaired or dismantled, and the metal wood screws can be easily separated from other waste materials when disposing of waste materials. it can.

The invention's effect

[0009] The architectural wood screw of the present invention having the above configuration is suitable for attaching a hard plate material to a wooden base as compared with a wood material, and the head of the wood screw is flush with the hard plate material. Or, the head can be easily screwed in until the surface force of the plate slightly subsides, during which the surface of the hard wall material is greatly damaged by the head of the wood screw. At the time of repairing or dismantling waste materials during building demolition, metal screws can be easily separated from other materials.

Brief Description of Drawings

FIG. 1 is a front view showing an embodiment of a wooden screw for construction according to the present invention.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is an enlarged sectional view of a screw thread in the embodiment.

FIG. 4 is an enlarged front view of a neck portion in the embodiment.

FIG. 5 is an enlarged sectional view of a rib in FIG. 4. Explanation of reference numerals

1 wood screw

2 shaft

3 head

4 neck

21 thread

31 Tool holder

32 Flange

41 Lucky surface

42 ribs

43 Saji Line

44 Slope

α Flanking angle on driving side

β Pull-out side flank angle

BEST MODE FOR CARRYING OUT THE INVENTION

[0012] In the illustrated embodiment, mainly for a 2X4 construction method, a hard interior wall material or the like as compared with a wood material such as a particle board is attached to a base made of a wood material. It is constructed as a wood screw for construction used in this case.

As shown in FIG. 1, the wood screw 1 of this embodiment has a shaft portion 2 having a thread 21 and a tool hook portion 31 (see FIG. 2) for screwing the shaft portion 2. And a neck 4 having a flared surface 41 whose diameter increases from the shaft 2 toward the head 3.

[0013] The shaft portion 2 has a thread 21 in which the force near the tip of the pointed tip portion 22 is also cut to the round bar portion 24 on the head side, and the thread 21 is shown in FIG. The flank angle of the driving flank 25 located on the tip side of the shaft portion 2 of the screw thread 21 α force The flank angle of the pull-out flank 26 located on the head 3 side is formed to be larger than | 8. The flank angle α on the driving side is formed at 30 degrees, and the flank angle β on the extraction side is formed at 15 degrees. As a result, the resistance of the wood screw driving is reduced, while the resistance of the wood screw is increased.

The head 3 has a disk shape having a larger diameter than the shaft portion 2, and a flat flange portion 32 continuous with the flared surface 41 of the neck portion 4 is provided around the head portion. Is provided. The flange portion 32 is configured to have a plane having a width of 0.5 mm in the wood screw prototyped by the present inventor, but is not limited thereto. However, if the flange portion 32 is made larger, the holding strength of the attached plate is increased, but on the other hand, resistance occurs at the final stage of driving of the wood screw 1, and the flange portion 32 makes the head 3 difficult to sink into the plate. Therefore, it should be set to an appropriate width in relation to other structures in the wood screw 1, for example, the shape of the trumpet-shaped surface 41 in the neck portion 4 and the ribs 42 and the like described later provided thereon.

Further, the tool holder 31 is provided on the surface of the head 3. As shown in FIG. 2, the tool holder 31 is formed by a square hole into which a square wrench is fitted.

Further, as shown in FIGS. 4 and 5, the wood screw 1 has a trumpet-shaped neck portion 4 located between the round bar portion 24 of the shaft portion 2 and the head portion 3, and The neck 4 is provided with a plurality of chevron-shaped ribs 42 on the surface of a trumpet-shaped surface 41 connected to the round bar 24. The rib 42 is a protrusion having a blade-shaped ridge line 43 extending linearly to the shaft portion 2 side force head 3 side of the trumpet-shaped surface 41, and the slopes 44 on both sides forming the rib 42 are The ribs are formed so as to be inclined at an equal angle with respect to a direction perpendicular to the center axis of the shaft portion 2 and to cross each other at an angle of approximately 90 degrees. 42 blade-shaped ridge lines 43 are formed.

[0016] These ribs 42 function as cutting blades for cutting a portion of the plate material around the trumpet-shaped neck portion 4 when driving the wood screw 1, whereby the head portion 3 and the neck portion 4 are accommodated. The counterbore is formed in a plate material. As a result, even if the flange portion 32 around the head portion connected to the neck portion 4 has a shape in which the head portion 3 is difficult to sink by the plate material, the head of the wood screw 1 is formed. The part 3 can be easily screwed in until it is flush with the above-mentioned hard plate material or the head is slightly lowered from the plate surface. The rib 42 also functions to prevent the wood screw 1 from loosening after the wood screw 1 is screwed.

[0017] In the illustrated embodiment, the ribs 42 have a force of arranging six of the same shape at equal intervals on the entire circumference of the flared surface 41. Desirably, four or more ribs are arranged at equal intervals on the entire circumference of the neck. And more specifically , About four to eight are provided.

Conventionally, JIS SWCH18A wire steel is used as a wood screw for fixing a board material harder than wood material such as particle board to the base material. The screw is made of SWCH10AM wire rod steel, which has the same surface hardness and carburized hardened layer depth as the SWCH18A, but has low flexibility in the content of carbon and manganese and can reduce the core hardness. In addition, since the tightening force can be sufficiently exerted even when driven into a hard plate material, and the diameter of the shaft portion 2 and the height of the screw thread are increased, the mounting strength is also increased in this respect.

[0019] In the wood screw 1 for construction having the above configuration, a flat flange portion 32 is provided around the head 3, and the driving side flank angle α of the screw thread 21 is made larger than the drawing side flank angle | 8. Although the holding strength of the attached plate material is increased, a plurality of ribs 42 having a blade-shaped ridge line 43 are provided on the trumpet-shaped surface 41 of the neck, so that the ribs 42 are used for screwing by the ribs 42. The periphery of the surface 41 is cut so that the head 3 of the wood screw can be easily screwed in flush with the hard plate or until the head sinks slightly from the plate surface. The rib 42 also functions to prevent loosening after the wood screw is screwed.

[0020] Further, since the tool holding portion 31 for screwing the shaft portion 2 is formed by a square hole, the periphery of the tool holding portion 31 can be collapsed as compared with the case having a plus or minus driver groove. Therefore, the wood screw 1 can be easily unscrewed even when the building is repaired or dismantled, and the metal wood screw can be easily separated from other waste materials when disposing of the waste material.

Claims

The scope of the claims

[1] A wood screw for construction for mounting a harder board material than a wood material such as a particle board on a wood base,

A shaft portion having a thread, a head portion having a tool hook for screwing the shaft portion, having a larger diameter than the shaft portion, and a trumpet shape expanding from the shaft portion toward the head portion. The screw thread of the shaft portion is formed such that the driving side flank angle at the shaft portion tip side is larger than the drawing side flank angle at the head side,

The neck portion having the trumpet shape is provided with a plurality of chevron-shaped ribs having a blade-like ridge line extending toward the head portion of the shaft portion of the trumpet-shaped surface,

A wood screw for architectural use, wherein a flat flange portion connected to a trumpet-shaped neck portion is provided around the head.

[2] The wooden screw according to claim 1, wherein the driving side flank angle of the screw thread is 30 degrees, and the drawing side flank angle is 15 degrees.

[3] The ridgeline of the chevron rib at the neck is formed by the intersection of two slopes that are equiangularly inclined with respect to the direction perpendicular to the central axis of the shaft and intersect each other at an angle of about 90 degrees. The wood screw for building according to claim 1 or 2, wherein four or more ribs are provided at equal intervals around the entire circumference of the neck.

[4] The wooden screw for construction according to any one of [1] and [3], wherein the tool hooking portion in the head is formed by a square hole.