JP3233356U - Building wood screws - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw for building wood, which is hard to be pulled out from thin wood due to aging and has increased pull-out strength. The pitch of threads 8 is 3.0 mm to 6.0 mm, and the apex angle of the threads is 40 ° to 65 °. By forming the screw portion 7 of the building wood screw 1 in this way, the entanglement with the screwed wood is strong, so that it is difficult to come off from the thin wood due to aged deterioration, and the strong fastening between the woods is maintained for a long period of time. can. Further, since the threaded portion is spirally formed with threads having the same diameter as the body portion 5, it is possible to realize superior quality in terms of strength and construction. Further, since the length of the incompletely threaded portion 6 can be accurately controlled, the workability and quality at the time of construction depending on the place of use are excellent. Further, by giving a conical angle of 50 ° to 80 ° to the tip of the screw portion, the construction when fastening to wood becomes easy. [Selection diagram] Fig. 1

Description

The present invention relates to screws for building wood used for fastening building members made of wood.

A general wood screw has a round shaft portion having a head and a tip of the round shaft portion having a sharpened shape, and has a configuration in which a continuous spiral thread formed on the peripheral surface thereof is provided. It is screwed with a tightening tool such as a wrench or impact wrench while forming a thread groove on wood.

Jitsuto No. 3081944

When timber screws are used to fasten building timber, the building timber must remain fastened for a long period of time. However, the wood becomes thin over the years, causing problems such as loosening of the fastened wood screws, strength problems due to the difference in diameter between the round shaft and the screw, and the screw length. There was a problem with the accuracy of the work, and there was a problem when considering the workability.

Therefore, as a means for solving the above problems, the screw for building wood according to the present invention is a screw used for fastening a building member made of wood, and has a head that can be fastened to a tool and a tip from the head. A threaded portion extending in the direction, having a columnar body and extending in the tip direction from the body, and having threads spirally formed on the peripheral surface having the same diameter as the body. A flat portion formed between the screw thread and the screw thread is provided in the axial direction of the screw portion.

Further, the pitch of the threads is preferably 3.0 mm to 6.0 mm, the apex angle of the threads is preferably 40 ° to 65 °, and more preferably the pitch of the threads is 5.4 mm. It is ~ 5.6 mm, and the apex angle of the thread is 55 ° to 60 °. Further, the height of the screw thread is 2.0 mm to 5.0 mm. By forming the screw part of the building wood screw in this way, it is said that it is hard to come off from the thin wood due to aging because it is strongly entangled with the screwed wood, and it is possible to maintain a strong fastening between the wood for a long time. It can exert an excellent effect. Further, by forming the tip of the screw portion in a conical shape of 50 ° to 80 °, the construction when fastening to wood becomes easy. Further, the angle of the tip of the conical shape of the screw portion is more preferably formed to be 60 ° to 75 °, and particularly preferably 70 °. By forming the angle of the tip of the screw portion in this way, screwing into the building wood becomes easy. Further, it is preferable that a part of the base end of the conical shape is formed so as to be continuous with the screw thread. The conical shape at the tip makes it easy to insert into the pilot hole of the timber and has good workability.

Furthermore, it is preferable that the threads of the threaded portion are formed by cutting from the state of being a rod-shaped material before the thread forming step. By cutting and forming the screw thread, the effective part of the screw thread can be formed accurately, so that it is not tightened more than necessary when fastening with wood, and construction can be performed without causing cracks in the wood. Further, since the diameter of the screw portion is the same as a whole, there are many contact patches with the wood, and the pull-out strength is increased. In addition, by forming the threads by cutting, it is possible to prevent the occurrence of voids inside the pressure-deformed threads due to rolling when threading the screws for building wood, and the completed screws for building wood. Can increase the strength of. In other words, it is preferable that the threads of the threads of the building wood screws are not formed by rolling. When a screw thread is formed by rolling, there is a high possibility that a void is generated inside the screw portion due to pressure deformation due to rolling. If there is a void derived from rolling inside the threaded portion, the strength inside the threaded portion will be uneven. Therefore, it is preferable to form the screw thread by cutting in order to improve the homogeneity of the quality of the screw for building wood according to the present invention, which is expected to have stable fastening strength even with the aging of the building wood over many years.

According to the screw for building wood according to the present invention, it is easy to screw into wood, and since there are many contact patches with the screwed wood, it exhibits an excellent effect that it is hard to come off even from thin wood over time. be able to.

It is a front view which shows the whole of the screw 1 for building wood which concerns on this invention. It is an enlarged partial end view which showed the vertical end face cut at the axis center of the building wood screw 1. It is a partially enlarged vertical sectional view of the tip portion 4.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view showing the entire building wood screw 1 according to the present invention as viewed from the front. The building wood screw 1 has a columnar body 5 extending from the head 2 toward the tip. Further, a screw portion 7 formed by spirally forming a screw thread 8 having the same diameter D1 as the diameter D2 of the body portion 5 is extended in the tip direction from the body portion 5.

Further, an incomplete threaded portion 6 is formed between the body portion 5 and the threaded portion 7 in which the outer diameter of the shaft body 3 is gradually reduced toward the tip end direction. Further, the tip portion 4 of the body portion 5 is formed in a conical shape. Since the tip portion 4 has a conical shape, it can be easily inserted into the pilot hole of the timber and the workability is improved. The head 2 may be formed in a hexagonal columnar shape in a plan view that can be screwed in with a tightening tool such as a wrench or an impact wrench.

FIG. 2 is an enlarged partial end face view showing an enlarged vertical end face obtained by cutting the portion surrounded by the alternate long and short dash line in FIG. 1 at the axial center of the building wood screw 1. The screw thread 8 of the building wood screw 1 has a flat portion 9 formed between the screw thread 8 and the screw thread 8 adjacent to each other along the axial direction X of the screw portion 7.

In the present embodiment, taking M20 as an example, the pitch between the screw thread 8 and the apex P of the screw thread 8 is formed to be 5.4 mm to 5.6 mm. Further, the apex angle θ1 of the screw thread 8 is formed to be 55 ° to 60 °. Further, the height h of the screw thread 8 is formed to be 2.0 mm to 3.0 mm. By forming the screw thread 8 of the screw portion 7 in such a configuration, it is possible to strengthen the entanglement with the screwed wood, it is difficult to pull out from the thin wood due to aging, and the strong fastening between the building woods is long-term. It can exert an excellent effect that it can be maintained for a long time.

Further, as shown in FIG. 3, the angle θ2 of the tip portion 4 is formed to be 60 ° to 75 °. By forming the angle θ at such an angle, it is possible to facilitate screwing into the building wood which is a building member.

As shown in FIGS. 1 and 3, the screw thread 8 of the building wood screw 1 according to the present invention is preferably formed by cutting. By cutting the screw thread 8 and forming a part of the base end of the conical shape of the tip portion 4 so as to be continuous with the screw thread 8, it is easy to perform the cutting process as a series of operations. Further, by forming the screw thread 8 by cutting, the screw thread 8 can be formed without rolling. By not using rolling, it is possible to form a flat portion 9 with a sufficient width, it is possible to strengthen the entanglement with the screwed wood, and it is remarkable that it is hard to come off from the thin wood due to aging. It is possible to realize a screw 1 for building wood that exhibits a fastening effect. Further, by not forming the screw thread 8 by rolling, the screw thread 8 can be formed without the possibility of generating a void inside the screw portion 7 due to the pressure applied to the screw material during rolling.

1 Screws for construction wood 2 Head 3 Shaft body 4 Tip part 5 Body part 6 Incomplete threaded part 7 Threaded part 8 Threaded thread 9 Flat part

Claims (5)

A screw used to fasten building members made of wood.
A head that can be fastened to a tool,
It extends from the head toward the tip, and has a columnar body and
A screw portion that extends in the direction of the tip from the body portion and has a spiral thread having the same diameter as the body portion on the peripheral surface.
A screw for building wood, which comprises a flat portion formed between the threads in the axial direction of the threads. The thread pitch is 3.0 mm to 6.0 mm.
The apex angle of the thread is 40 ° to 65 °.
The screw for building wood according to claim 1, wherein the height of the screw thread is 2.0 mm to 5.0 mm. 1. Screws for building wood according to 2. An incomplete threaded portion having an inclined portion whose diameter is gradually reduced from the peripheral surface of the body portion toward the flat portion is formed between the body portion and the threaded portion.
3. Screws for building wood described in any one. The screw for building wood according to any one of claims 1 to 4, wherein the screw thread is formed by cutting.

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