JP2001027213A - Building screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building screw screwed well into a hard cut member at the start of screwing and firmly fastened to the hard cut member after screwed. SOLUTION: This building screw S is provided with a head 10 and a shank 20 extending from the head 10. The head 10 has a tapered peripheral wall 10a gradually reduced in diameter toward the shank 20 side, and the tapered peripheral wall 10a is provided with a serration 11. The shank 20 is provided with a pointed part 21 formed as an angle of approximately 30 deg. with the tip 30 as a cardinal point, a first thread part 22a provided on the pointed part 21 side, a second thread part 22b provided on the head 10 side, and a flat part 23 provided between the first thread part 22a and the second thread part 22b. The thread ridge diameter of the first thread part 22a is formed to be smaller than that of the second thread part 22b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an architectural screw used for fixing a hard cut material such as wood or particle board to a soft cut material such as ALC.

[0002]

2. Description of the Related Art In recent years, as seen in cellular concrete base materials such as ALC, building materials manufactured by molding powder materials have been widely used. The cellular concrete base material is used for, for example, a wall surface, a floor surface, or a roof.
And the building screw 100
, A particle board, a body edge, and the like are attached.

As shown in FIGS. 8 and 9, a construction screw 100 has a head 110 engaged with a rotary tool and a head 110.
And a shaft portion 120 extending from the shaft portion 120. The shaft portion 120 is provided with a screw portion 122.

The tip of the architectural screw 100 has a tip 130
Is formed at an acute angle of approximately 45 degrees with reference to. Then, from this tip to the lower part of the head, the screw 122
Are formed. The screw portion 122 is formed with the same mountain diameter from the distal end side to below the neck of the head.

When a hard cutting material 140 such as a particle board is attached to a soft cutting material such as cellular concrete (not shown) using the above-mentioned building screw 100, the tip 130 of the hard cutting material 140 is attached. The shaft 120 was screwed into the soft-cutting material and the hard-cutting material 140 by standing on the surface and rotating while applying a predetermined thrust force.

[0006]

When the hard cutting material 140 is fixed to the soft cutting material by using the above-mentioned conventional building screw 100, when the shaft portion 120 advances the hard cutting material 140, the building material is hardened. There is a problem that the tip of the screw 100 cannot smoothly pierce the hard cutting material 140 and a part of the lower surface of the hard cutting material 140 is peeled off as shown in FIG. When a part of the hard material 140 is peeled off as described above, the length of the female screw formed in the hard material 140 by the screw portion 122 is shortened, and the head 110 is embedded in the hard material 140. At this time, the screw 12
2 does not sufficiently mesh with the hard work material 140, and there is a problem that the thrust of the screw portion 122 in the hard work material 140 becomes small.

As described above, the threaded portion 1 of the hard material 140
When the thrust of the head 22 is limited, the thrust of the screw portion 122 is smaller than the resistance force when the head 110 is embedded in the hard material, and the head 110 is embedded in the hard material. There was a problem that could not be. In particular, since the particle board is harder than wood, as shown in FIG. 9, even when the head 110 is provided with serrations 111 to grind the hard material, the head 110 is embedded in the hard material. There was an inconvenience of not doing it.

As described above, when the head 110 is embedded in the hard-cut material 140, the resistance is large. Even when the architectural screw 100 is rotated, the architectural screw 10 has a distance corresponding to the number of rotations.
When 0 does not enter the hard-cutting material and the soft-cutting material, the soft-cutting material such as ALC is soft and brittle. However, there is a disadvantage that the female screw portion is destroyed.
In this way, if the internal thread of the soft-cutting material is broken, it becomes impossible to obtain sufficient pull-out resistance for the building screw 100, and the hard-cutting material and the soft-cutting material can be assembled with sufficient strength. turn into.

An object of the present invention is to provide an architectural screw which has a good screwing property to a hard material at the start of screwing, and which is firmly fastened to the hard material after screwing. is there.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided an architectural screw having a head and a shaft extending from the head. The head has a tapered peripheral wall having a gradually decreasing diameter toward the shaft portion side, and the tapered peripheral wall is provided with serrations, and the shaft portion has a sharp point formed at an angle of approximately 30 degrees from a tip as a base point. Part, a first screw part provided on the sharp part side, a second screw part provided on the head side, and between the first screw part and the second screw part. The first and second screw portions are provided with a flat portion, and the diameter of the first screw portion is smaller than that of the second screw portion.

As described above, since the architectural screw of the present invention is provided with the sharp portion formed at an acute angle of about 30 degrees, even if the hard cutting material is a hard plate material such as a particle board. The drilling proceeds smoothly while drilling the hard-cut material, and penetrates without peeling the lower side of the hard-cut material. Therefore, the length of the female screw portion formed on the hard-cut material can be increased, and the second screw portion can be sufficiently engaged with the hard-cut material.

Further, since the thread diameter of the first screw portion following the sharp portion is formed smaller than that of the second screw portion, the female screw portion formed by the first screw portion has the second thread portion. Can be screwed together with a large thrust.

[0013] If the first thread portion is formed to have a crest diameter approximately 0.5 mm smaller than the second thread portion, the second screw portion can be screwed into the second screw portion without difficulty. It is preferred. As described above, since the second screw portion can be securely screwed into the hard-cut material, even if a resistance force is generated when the head is embedded in the hard-cut material, the architectural screw is idled. It can be screwed in without causing breakage of the female screw portion due to idling, and the adherend can be securely tightened.

Also, after the screw tip penetrates through the hard-cutting material, it takes some time until the screw portion is formed in the soft-cutting material. During this time, the building screw S is propelled downward. Therefore, floating may occur between the hard-cutting material and the soft-cutting material. In order to eliminate this floating, the architectural screw of the present example is provided with a flat portion that is continuous with the first screw portion. The flat portion advances to the hard cutting material following the first screw portion, and idles in the hard cutting material to reduce screw engagement. As described above, by reducing the screw engagement, the hard-cut material can be lowered toward the soft-cut material by its own weight. Therefore, the hard-cutting material and the soft-cutting material are brought into close contact with each other, and the floating generated between the hard-cutting material and the soft-cutting material can be eliminated.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An architectural screw S of the present invention
0 and a shaft portion 20 extending from the head 10.
The head 10 has a tapered peripheral wall 10a whose diameter gradually decreases toward the shaft portion 20 side. A serration 11 having a saw blade shape is provided on the tapered peripheral wall 10a. The serrations 11 are used to grind the hard-cutting material when the head 10 is embedded in the hard-cutting material 40 and reduce the resistance of the head 10.

The shaft portion 20 of the architectural screw S of the present invention has a sharp portion 21, a first screw portion 22a, and a second screw portion 22b.
And a flat portion 23. The sharp part 21 is formed at an angle of about 30 degrees with the tip 30 of the building screw S as a base point.

As described above, since the sharp portion 21 of approximately 30 degrees is provided on the tip side of the building screw S, when the building screw S is screwed into the hard cutting material 40, Drilling is facilitated, and the building screw S can be smoothly screwed.

A first screw portion 22 is provided on the sharp portion 21 side.
a is formed. In addition, a second screw portion 22b is formed on the head 10 side. A flat part 23 is formed between the first screw part 22a and the second screw part 22b. The flat portion 23 advances to the hard cut material 40,
The purpose is to reduce the engagement of the screw in the hard cut material 40 and lower the hard cut material 40 by its own weight, thereby eliminating the floating generated between the hard cut material and the soft cut material.

The thread diameter of the first screw portion 22a is
Is formed smaller than the thread diameter 22b of the threaded portion. More specifically, the crest diameter of the first screw portion 22a is formed to be approximately 0.5 mm smaller than the crest diameter of the second screw portion 22b. Therefore, the second screw portion 22b meshes with the female screw portion formed by the first screw portion 22a with a large thrust, and the second screw portion 22b can be securely screwed to the hard work material 40. It becomes possible.

[0020]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 to 7 show an embodiment according to the present invention. FIG. 1 is an explanatory view showing a building screw, and FIG. 2 is a sharp part and a first screw part penetrating a hard cut material. FIG. 3 is an enlarged view of a main part showing a state in which the head is embedded in a hard-cut material, and FIGS. 4 to 7 are diagrams showing construction screws for hard-cut and soft-cut materials. It is explanatory drawing which shows the process of fastening. In addition,
The hard-cutting material and the soft-cutting material in FIGS. 2 to 7 are shown in cross section, but the hatching indicating the cross section is omitted in order to clearly show the fastening state with the building screws.

As shown in FIG. 1, the construction screw S of this embodiment has a head 10 and a shaft 20 extending from the head 10. The architectural screw S is used to fasten a hard cut material such as wood or particle board and a soft cut material such as ALC. The building screw S is formed to have a length of, for example, 90 mm.

The head 10 is, as shown in FIG.
Is formed in a shape having a tapered peripheral wall 10a whose diameter becomes gradually smaller toward. The serration 11 is formed in a saw-tooth shape in cross section, and when the head 10 is embedded in the hard-cut material 40, the serration 11 is cut to reduce the resistance when the head is inserted. An engagement portion (not shown) for engaging with the rotary tool is formed on the end face 12 of the head 10. The engaging portion is formed, for example, as a plus groove or a minus groove.

As shown in FIG. 1, the shaft portion 20 has a sharp portion 2
1, a first screw portion 22a, a second screw portion 22b,
And a flat part 23. A sharp portion 21 is located at the foremost side of the shaft portion 20, a first screw portion 22a is formed following the sharp portion 21 side, and a second screw portion is formed on the head 10 side with the flat portion 23 interposed therebetween. A portion 22b is formed.

The sharp portion 21 of this embodiment has a configuration in which no thread is provided on the peripheral surface. Further, the sharp portion 21 is formed at approximately 30 degrees with the tip 30 as a base point so that the tip of the building screw S can maintain a predetermined strength and penetrate smoothly without breaking the hard work material 40. Is formed.

As shown in FIG. 1, the first screw portion 22a is formed on the sharp portion 21 side, and is formed in a range of about two thirds of the shaft portion 20. As described later, the first screw portion 22a is provided with a hard cut material 40 and a soft cut material 50 as adherends.
When screwed into the hard cutting material 40 and the soft cutting material 50, it is screwed.

The second screw portion 22b is formed below the head 10 of the building screw S. The second screw portion 22b is
The first screw portion 22a is formed to be shorter than the first screw portion 22a, and is configured to be screwed to the hard work material 40 to fix the building screw S.

The first screw portion 22a and the second screw portion 2
2b is a female screw portion formed by the first screw portion 22a,
The first screw portion 22a is formed such that the crest diameter is smaller than the crest diameter of the second screw portion 22b so that the second screw portion 22b can be engaged with the second screw portion 22b without difficulty and securely. ing. In this example, the dimensional difference between the crest diameter of the first screw portion 22a and the crest diameter of the second screw portion 22b is 0.5 m
m. More specifically, the first screw portion 22a has a crest diameter of 6.0 mm, and the second screw portion 22b has a crest diameter of 6.0 mm.
It is formed to 5 mm.

The flat portion 23 is located between the first screw portion 22a and the second screw portion 22b, and has a diameter equal to or smaller than the peak diameter of the first screw portion 22a. Have been. The flat portion 23 is for eliminating floating generated when the building screw S is screwed into the hard-cut material 40 and the soft-cut material 50.

That is, after the screw tip penetrates through the hard-cutting material, it takes some time until the screw portion is formed in the soft-cutting material. During that time, the building screw S is propelled downward. As a result, before tightening the building screw S, the hard material 4
0 rises from the soft cutting material 50.

At this time, the flat portion 23 provided on the architectural screw S of the present example advances to the hard work material 40, so that the threading of the hard work material 40 is reduced, and the hard work material 4 is removed.
0 can be lowered to the soft cutting material 50 side by its own weight. In this manner, the hard-cut material 40 and the soft-cut material 50 are brought into close contact with each other, and the floating generated between the hard-cut material 40 and the soft-cut material 50 can be eliminated.

Next, a process of fastening the hard cutting material 40 to the soft cutting material 50 using the building screw S of this embodiment will be described. 4 to 7 are explanatory views showing a process of fastening the building screw S to the hard-cut material 40 and the soft-cut material 50 as adherends. FIG. 2 is an enlarged view of a main part showing a state in which the sharp part 21 and the first screw part 22a penetrate the hard material 40. FIG. 3 shows a state in which the head 10 is embedded in the hard material 40. FIG.

As shown in FIG. 4, first, the sharp portion 21 of the building screw S is made to enter the hard-cut material 40. The sharp part 21
When the sharpened portion 21 is driven into the hardened material 40 and the sharp portion 21 is driven to some extent, the first screw portion 22a reaches the perforation of the hardened material 40 opened by the sharpened portion 21. A rotary tool such as a wrench, a wrench, or a power tool is applied to the part to rotate the building screw S.

The first screw portion 22a is screwed in while being guided by the hole formed by the sharp portion 21. Then, the sharp portion 21 advances while piercing the hard work material 40 by the thrust of the first screw portion 22a.

The sharp portion 21 is formed at an acute angle of approximately 30 degrees. Even if the hard cutting material 40 is a hard plate material such as a particle board, the sharp cutting portion 21 smoothly advances while piercing the hard cutting material 40, As shown in FIG. 2, the lower side of the hard cut material 40 penetrates without being separated.

The sharp portion 21 and the first screw portion 22a require some time after the hard cutting material 40 has been penetrated to form a screw portion in the soft cutting material. As shown in FIG. 5, the hard screw 4
Float occurs between 0 and the soft cutting material 50.

However, since the flat portion 23 is provided in the building screw S of this embodiment, the flat portion 23 enters the hard material 40, so that the thread portion of the hard material 40 is hardly applied to the hard material 40. Then, the hard-cutting material 40 acts to fall down by its own weight, thereby bringing the hard-cutting material 40 and the soft-cutting material 50 into close contact with each other, and eliminating floating.

Next, as shown in FIG.
2b enters the hard material 40. The hard cutting material 40 has a female screw portion formed by the sharp portion 21 and the first screw portion 22a, while the second screw portion 22b is formed by the first screw portion 22a.
Since the diameter of the second screw portion 22b is larger than that of the second screw portion 22b, the second screw portion 22b is screwed to the hard work material 40 with a large thrust.

After the first screw portion 22a and the second screw portion 22b are screwed into the hard-cut material 40 and the soft-cut material 50 by the above steps, finally, as shown in FIG. The building screw S is fixed by being embedded in the hard cutting material 40. As described above, the architectural screw S penetrates the hard-cut material 40 without breaking a part thereof.
A longer female screw portion for screwing the second screw portion 22b is secured.

As described above, by securing a large length of the female screw portion of the hard-cut material 40, the second thread is formed as shown in FIG.
Can be screwed into the hard work material 40, and can be securely tightened. Also, since the thread diameter of the second screw portion 22b is formed to be larger than the thread diameter 22a of the first screw portion, the female screw portion formed by the first screw portion 22a has the second thread. The screw portion 22b can be screwed with a large thrust.

Further, since the serrations 11 are formed on the head 10, the hard cutting material 40 is cut by the serrations 11 to reduce the resistance when the head 10 is embedded in the hard cutting material 40.

Therefore, the hard cutting material 40 is hard and the head 1
Even if the resistance when embedding 0 is large, the second
Screw 22b into the hard material 40 with a large thrust,
The head 10 can be implanted. In this way, it is possible to prevent the screw from spinning which has been generated when the head 10 is embedded, and without breaking the internal thread portion formed on the soft-cutting material 50, It is possible to securely fasten the cutting material.

In the above embodiment, the construction screw S
The length of the first screw portion is 6 mm, the length of the
Although the example in which the thread diameter of the threaded portion is 6.5 mm is shown, the dimension of the building screw S is not limited to this, and the thread diameter of the first threaded portion is larger than the threaded diameter of the second threaded portion. Of course, if the diameter is reduced, it may be formed in any size.

[0044]

As described above, since the architectural screw of the present invention has a sharp portion formed at an acute angle of about 30 degrees, the hard cutting material is a hard plate material such as a particle board. Even if the hard material is drilled, it proceeds smoothly while drilling the hard material, and the hard material can be penetrated without peeling off the lower side. Therefore, the length of the female screw portion formed on the hard-cut material can be increased, and the second screw portion can be sufficiently engaged with the hard-cut material.

Further, since the thread diameter of the first thread portion following the sharp portion is formed smaller than the thread diameter of the second thread portion, the female thread formed by the first thread portion has the second thread diameter. Can be screwed together with a large thrust.

When the diameter of the first screw portion is formed to be approximately 0.5 mm smaller than the diameter of the second screw portion, the second screw portion can be screwed into the second screw portion without difficulty. It is preferred. As described above, since the second screw portion can be securely screwed into the hard-cut material, even if a resistance force is generated when the head is embedded in the hard-cut material, the architectural screw is idled. It can be screwed in without causing breakage of the internal thread due to idling, and it is possible to securely tighten the adherend

Also, after the tip of the screw has penetrated the hard-cut material, it takes some time until the screw portion is formed in the soft-cut material. In some cases, floating occurs between the hard-cutting material and the soft-cutting material. In order to eliminate this floating, the architectural screw of the present example is provided with a flat portion that is continuous with the first screw portion. The flat portion advances to the hard cutting material following the first screw portion, and idles in the hard cutting material to reduce screw engagement. As described above, by reducing the engagement of the screws, the hard cut material can be lowered to the soft cut material side by its own weight. Therefore, the hard-cutting material and the soft-cutting material are brought into close contact with each other, and the floating generated between the hard-cutting material and the soft-cutting material can be eliminated.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a building screw of the present invention.

FIG. 2 is an enlarged view of a main part showing a state where a sharp part and a first screw part penetrate a hard material.

FIG. 3 is an enlarged view of a main part showing a state where the head is embedded in a hard-cut material.

FIG. 4 is an explanatory view showing a step of fastening a building screw to a hard-cut material and a soft-cut material.

FIG. 5 is an explanatory view showing a step of fastening a building screw to a hard material and a soft material.

FIG. 6 is an explanatory view showing a step of fastening a building screw to a hard-cut material and a soft-cut material.

FIG. 7 is an explanatory view showing a step of fastening a building screw to a hard cut material and a soft cut material.

FIG. 8 is an explanatory diagram showing a conventional example.

FIG. 9 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Head 11 Serration 12 End surface 20 Shaft part 21 Sharp part 22a 1st screw part 22b 2nd screw part 23 Flat part 30 Tip 40 Hard cutting material 50 Soft cutting material S Architectural screw

Continued on the front page (72) Inventor Yuji Yamanaka 3-5-5 Umeda, Kita-ku, Osaka-shi, Osaka Prefecture Inside Daiwa House Industry Co., Ltd. (72) Inventor ▲ Taka ▼ Kunio 605 Sekikawacho, Sano-shi, Tochigi Stock (72) Inventor Dr. Tsuji 1064 Enmeicho, Kashiwara-shi, Osaka

Claims (2)

[Claims] 1. An architectural screw having a head and a shaft extending from the head, wherein the head has a tapered peripheral wall having a gradually decreasing diameter toward the shaft. The tapered peripheral wall is provided with serrations. The shaft portion has a sharp portion formed at an angle of approximately 30 degrees from the tip as a base, a first screw portion provided on the sharp portion side, and the head side. A second screw portion provided on the
And a flat portion provided between the second screw portion and the second screw portion, wherein the crest diameter of the first screw portion is formed smaller than the crest diameter of the second screw portion. An architectural screw characterized by: 2. The architectural screw according to claim 1, wherein the thread diameter of the first screw portion is formed to be approximately 0.5 mm smaller than the thread diameter of the second screw portion.