JP2011137522A - Building screw and method for fastening building screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building screw and a method for fastening the building screw which are capable of preventing a jack-up phenomenon. <P>SOLUTION: The method for fastening a building screw is used to fasten a member W2 to be fastened such as wooden member and the like to a base material W1 such as a metal thin plate and the like by the use of a building screw 10, which includes a shaft portion 12 comprising a head portion 18 capable of being engaged with a driver bit and a screw portion 14, and a drill portion 22 capable of drilling a hole by being rotated in the reverse direction to the screw-in direction of the screw portion 14, and comprises a process of drilling a loose hole H2 on the member W2 to be fastened and a through-hole H1 on the base material W1 by means of the drill portion 22 rotated in the reverse direction to the screw-in direction of the screw portion 14, and a screw-in process of screwing the screw portion 14 in the base material W1 by rotating the building screw 10 in the screw-in direction before the screw portion 14 reaches the through-hole H1 of the base material W1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a building screw and a method for fastening a building screw, and to a metal base material such as a thin plate base steel plate, a material such as wood, plywood, OSB, wood wool board, hard wood cement board, ceramic outer wall material, etc. The present invention relates to a drill screw suitable for fastening a fastening member, or a construction screw such as a wood screw suitable for fastening the member to be fastened to a woody base such as wood, and a fastening method for the building screw.

As a conventional architectural screw which is the background of the present invention, for example, as shown in FIG. 11, a drill screw 1 for fastening a wooden member to be fastened W2 to a metal thin plate base material W1 is known. The drill screw 1 has a right-hand thread portion 1a serving as a male thread surface at its shaft portion, and a right cutting edge 1c for cutting by right rotation is formed on the drill portion 1b. The drill screw 1 is usually screwed by an electric driver (not shown).
However, when the drill screw 1 is screwed in, a threaded portion 2a serving as a female thread surface is formed on the fastened member W2. In this case, the screw surface (male screw surface) of the right screw portion 1a of the drill screw 1 and the screw surface (female screw surface) of the screw portion 2a are in the relationship of a screw pair that contacts each other as an even element.
Further, the traveling speed of the drill screw 1 in the fastened member W2 is higher than the traveling speed based on the cutting of the drill screw 1 by the pitch of the right thread portion 1a, but the traveling speed based on the cutting by the right cutting edge 1c of the drill portion 1b. Since it is small, it becomes difficult for the drill screw 1 to travel inside the fastened member W2 at a predetermined traveling speed, and the progress of the drill screw 1 is stopped when it hits the thin plate base material W1.
When the screw screw 1 is continuously screwed by the electric screwdriver (not shown) in this state, the fastening member W2 is moved in a direction opposite to the traveling direction of the drill screw 1 from the thin plate base material W1 by the rotation of the drill screw 1 and the screw portion 2a. As a result, a so-called jack-up phenomenon occurs in which a force that presses the drill screw 1 in the advancing direction acts and a force greater than the setting is applied to the cutting edge of the drill portion 1b.
Therefore, in the conventional drill screw 1 used as a building screw, due to the jack-up phenomenon, a problem occurs in that the member to be fastened W2 is cracked and the blade tip of the drill part 1b is broken and damaged, and the thin plate base material W1 is to be fastened. W2 could not be concluded.

Therefore, in order to solve the problems caused by the jack-up phenomenon, the following countermeasures have been proposed.
(1) A hole is processed in advance in the fastened member W2.
(2) As a drill screw with a reamer, for example, a taper neck portion whose outer diameter is gradually increased from the shank to the head portion is formed, and the outer peripheral surface of the taper neck portion is substantially extended in the axial direction. A self-drilling screw with a configuration in which ribs are arranged in the circumferential direction, a flat flange with a braking surface is formed on the outer periphery of the neck at the head, and a reamer blade that protrudes from the side edge of the tip drill is provided. For example, see Patent Document 1).
(3) As a drill screw with a pilot, for example, it comprises a drill blade, a screw portion, a screw head, and a pilot length portion between the drill blade and the screw portion, and the outer diameter of the pilot length portion is 0 than the outer diameter of the drill blade. Use a drill screw with a pilot length smaller than 0.03 mm (for example, see Patent Document 2).

Registered Utility Model No. 3003477 JP 2007-333026 A

However, in the above countermeasure (1), since the hole is processed in advance in the fastened member W, the number of construction steps for fastening the fastened member to the thin plate base material is increased, and the construction time is long.
Further, when the self-drilling screw of the countermeasure (2) described above is adopted, the manufacturing cost for forming the tapered neck, the cutting rib, the flange with the braking surface, and the reamer blade on the self-drilling screw is high. It has become a thing.
In addition, a so-called reamer-equipped drill screw 3 is used to fasten a thin metal plate W3 such as a thin steel plate on a fastened member W2 to a thin metal plate base material W1 such as a thin steel plate. If it tries to do, as shown in FIG. 12, the reamer blade 3a of the drill screw 3 with a reamer will scatter by the metal thin plate W3, and the function of the reamer blade 3a cannot be exhibited. In this case, since the jack-up phenomenon occurs in both the fastened member W2 and the metal thin plate W3 as shown in FIG. 13, for example, as shown in FIG. It has the same defect as the drill screw 1 used as a working screw.
Therefore, when the metal thin plate base material W1, the member to be fastened W2 and the metal thin plate W3 are overlapped and fastened, it is the actual situation that the jack-up phenomenon is allowed carefully at present. The jack-up phenomenon is more likely to occur as the drill screw 5 is screwed at once with a fastening tool (not shown in FIG. 13) such as an electric screwdriver. It is necessary to carefully screw in the screwed part W2 and the metal thin plate W3 so that the screw part is not formed or the screwed part is broken while repeating ON / OFF of the switch. It becomes long. Therefore, also in this case, the number of construction steps increases and the construction time is long.

  On the other hand, as a conventional architectural screw, for example, as shown in FIG. 14, for example, as shown in FIG. Since the jack-up phenomenon occurs and problems similar to the above-described problems such as cracking of the fastened member W2 occur, wood screws that solve such problems are in demand.

  Therefore, a main object of the present invention is to provide a building screw and a method for fastening a building screw that can prevent a jack-up phenomenon.

According to a first aspect of the present invention, there is provided a shaft portion having a head portion disposed on one end side in the axial direction and capable of engaging with a driver bit, a screw portion formed on a peripheral surface of the shaft portion, a shaft A building screw comprising a drill portion formed on the other end side in the axial direction of the portion and capable of being drilled by rotating the head in the direction opposite to the screwing rotation direction of the screw portion.
The present invention according to claim 2 is an invention dependent on the invention according to claim 1, wherein the screw portion includes a right screw, and the drill portion includes a drill screw having a configuration aspect of a left cutting edge. It is an architectural screw.
The present invention according to claim 3 is an invention dependent on the invention according to claim 1, characterized in that the screw portion includes a left screw, and the drill portion includes a drill screw having a configuration aspect of a right cutting blade. It is an architectural screw.
The present invention according to claim 4 is an invention dependent on the invention according to claim 1, and includes a wood screw in which the screw portion has a right screw or a left screw and the drill portion has a pointed portion. It is an architectural screw characterized by the following.
This invention concerning Claim 5 is the fastening method of the building screw which fastens a to-be-fastened member to a base material using the building screw of the invention concerning any one of Claims 1-3. The processing step of rotating the head of the building screw in the direction opposite to the screwing rotation direction of the screw portion of the building screw and processing the fool hole in the fastening member and the through hole in the base material by the drill portion, After drilling a hole in the fastened member with the drill and processing the through hole in the base material, rotate the head in the screwing rotation direction of the screw before the screw part reaches the through hole in the base material. And a step of screwing a screw part into the base material.
In the fastening method of the building screw according to claim 5, the building screw having the above-described configuration is rotated in the direction of rotation opposite to the screwing direction of the screw portion, so that the member to be fastened is drilled by the drill portion. Then, through holes are processed in the base material (processing step). In this case, in order to rotate the building screw in the direction opposite to the screw portion, the member to be fastened is formed with a fool hole without forming a screw surface screwed into the screw portion of the building screw. The
Next, before the screw portion of the building screw reaches the through hole of the base material, the building screw is moved in the direction opposite to the rotation direction in the previous processing step, that is, the same as the screwing rotation direction of the screw portion. By rotating in the direction, the screw portion of the building screw is screwed into the base material (screwing step). In this case, by rotating the building screw in the screwing direction, a screw hole having a screw surface that is screwed to the screw portion by the screw portion of the building screw is formed in the base material. By screwing the screw surface of the screw hole and the screw portion, the screw portion of the building screw is fastened to the base material.
Therefore, according to this method for fastening a building screw, the base material and the member to be fastened are smoothly fastened without causing a jack-up phenomenon.
The present invention according to claim 6 is a method for fastening a building screw, wherein the building screw of the invention according to claim 4 is used to fasten a non-metal fastened member to a wooden base material. Rotating the head of the building screw in a direction opposite to the screwing rotation direction of the threaded part of the machine, and processing a fool hole in the member to be fastened by the pointed end, and a wood substrate at the pointed end After the hole is drilled in the material, it includes a screwing step of screwing the screw part into the wooden base material by rotating the head in the screwing rotation direction of the screw part substantially simultaneously with the pointed part entering the wooden base material. It is the fastening method of the screw for construction characterized by this.
In the construction screw fastening method according to claim 6, the construction screw having the above-described configuration is rotated in the rotation direction opposite to the screwing direction of the screw portion, so that the fastening member is staggered by the pointed portion. A hole is machined (machining process). In this case, in order to rotate the building screw in the direction opposite to the screw portion, the member to be fastened is formed with a fool hole without forming a screw surface screwed into the screw portion of the building screw. The
Furthermore, at the same time as the sharpened tip of the building screw enters the wood substrate, the building screw is rotated in the direction opposite to the rotation direction in the previous processing step, that is, in the screwing rotation direction of the screw portion. By doing so, the screw portion of the building screw is screwed into the wooden base material (screwing step). In this case, by rotating the building screw in the screwing direction, a screw hole having a screw surface that is screwed to the screw portion by the screw portion of the building screw is formed in the wood base material. By screwing the screw surface of the screw hole and the screw portion, the screw portion of the building screw is fastened to the wood base material.
Therefore, according to this fastening method for building screws, the wood base material and the fastened member are smoothly fastened without causing a jack-up phenomenon.
The present invention according to claim 7 is a building screw fastening tool that is used in the method for fastening an architectural screw according to claim 5 or claim 6 and uses electric power or compressed air as a power source, The fastening tool includes a bit holder for fixing and holding a driver bit engaged with a head of a building screw, a rotation transmission means for transmitting a rotational driving force to the bit holder, and rotating the bit holder, and a rotation transmission A screw driver having a drive unit that applies a rotational driving force capable of rotating forward and reverse to the means, a support slider that is detachably disposed at an end of the screw driver, and that supports the screw driver, and the support slider is movable The support slider has a head of the building screw engaged with the driver bit, and the tip of the building screw is connected to the member to be fastened. Detecting means for detecting the movement distance moved in the screwing direction from the surface as the amount of displacement of the support slider relative to the scale shaft portion of the support slider that allows the screw driver to move along the scale shaft portion is built in the screw driver. A rotation direction control unit that receives the detection signal detected in step 1 and switches the rotation direction of the rotational drive force to either the forward rotation direction or the reverse rotation direction is built-in. Detecting means that the moving distance of the tip of the building screw has reached the moving distance of [L + T], where L is the length of the part and T is the thickness of the member to be fastened or the thickness of the wooden base material Is detected, the rotation direction control unit switches the rotation direction of the rotation driving force. This is a building screw fastening tool.

  ADVANTAGE OF THE INVENTION According to this invention, the fastening method of the building screw and the building screw which can prevent a jackup phenomenon is obtained.

  The above object, other objects, features, and advantages of the present invention will become more apparent from the following description of the best mode for carrying out the invention with reference to the drawings.

It is a front view which shows an example of embodiment concerning this invention. It is a principal part solution figure which shows the fastening method which fastens a base material and a to-be-fastened member using the drill screw shown in FIG. 1, Comprising: (A) And (B) It is a principal part illustration of the state which provides a hole, (C) is a principal part illustration of the state which provided the through-hole in the base material with the said cutting blade, (D) is a screw part of a drill screw, and is a base material It is a principal part illustration figure of the state screwed in the through-hole. FIG. 4 is a schematic illustration showing a main part of a screwing process in which a drill screw shown in FIG. 1 is screwed into a member to be fastened and a base material by using a fastening tool, and FIG. It is a principal part illustration figure which shows the process which has arrange | positioned the drill screw so that it may contact | connect, (B) It is a figure and (C) is a principal part solution figure which shows the process of screwing the thread part of a drill screw in the through-hole of a base material. It is a principal part solution figure which shows the secondary effect when a base material and a to-be-fastened member are fastened with the drill screw shown in FIG. It is a principal part solution figure which shows the comparative example of the state by which the to-be-fastened member was fastened by the base material using the conventional drill screw with a reamer compared with the secondary effect in the fastening state of the drill screw shown in FIG. It is a principal part solution figure which shows the other aspect of the to-be-fastened member fastened by the base material by the fastening method concerning this invention, and shows the fastening method of the said to-be-fastened member and base material. It is a front view which shows an example of other embodiment (drill screw) concerning this invention. It is a front view which shows an example of further another embodiment (wood screw) concerning this invention. It is a principal part illustration figure which shows the fastening method which fastens a base material and a to-be-fastened member using the wood screw shown in FIG. 8, Comprising: (A) and (B) are fastened by the sharp tip part of a wood screw It is a principal part illustration figure of the state which provides a hole in a member, (C) is a principal part illustration figure of the state which provided the hole in the base material in the said pointed part, (D) is a wood screw It is a principal part illustration figure of the state in which the screw part was screwed in the base material. It is a principal part solution figure which shows the screwing process which screws the wood screw shown in FIG. 8 in a to-be-fastened member and a base material by using a fastening tool, Comprising: (A) is the front-end | tip of a wood screw on the surface of a to-be-fastened member It is a principal part solution figure which shows the process which has arrange | positioned the wood screw so that it may contact | abut, (B) is a principal part solution figure which shows the process of drilling a hole in a to-be-fastened member in the pointed part of a wood screw. And (C) is a main part illustrative view showing a step of screwing a screw portion of a wood screw into a base material. An example of a conventional building screw (drill screw) as a background of the present invention is shown, and a main part illustration showing an example of a jack-up phenomenon that occurs when a fastening member is fastened to a base material by the conventional building screw. FIG. It is a principal part solution figure which shows an example of the jack-up phenomenon generate | occur | produced when fastening a to-be-fastened member to a base material with the other conventional building screw (drill screw with a reamer) used as the background of this invention. It is a principal part illustration figure which shows an example of the jackup phenomenon generate | occur | produced when fastening a to-be-fastened member to a base material with the other further conventional building screw (drill screw) used as the background of this invention. It is a principal part illustration figure which shows an example of the jack-up phenomenon generate | occur | produced when fastening a to-be-fastened member to a base material with the other further conventional building screw (wood screw) used as the background of this invention.

In the present embodiment, a building screw for fastening, for example, a thin base steel plate as an example of a base material and, for example, wood as an example of a member to be fastened will be described. FIG. 1 is a diagram showing an example of an embodiment according to the present invention.
The architectural screw 10 according to the present embodiment includes, for example, a drill screw 10A. The drill screw 10 </ b> A includes a shaft portion 12. On the peripheral surface of the shaft portion 12, a male screw surface serving as a right screw is formed as the screw portion 14, for example. The male screw surface is formed in a spiral shape with a predetermined length from one end side in the axial direction of the shaft portion 12 to the other end side.

Moreover, the head 18 is formed in the axial direction one end side of the axial part 12 via the neck part 16 which has a trumpet-like aspect. The neck portion 16 is formed so as to gradually expand in diameter from one end in the axial direction of the shaft portion 12 toward the head portion 18. A plurality of cutting ribs 20 arranged at intervals in the circumferential direction are formed on the outer peripheral surface of the neck portion 16. The head 18 is formed in, for example, a disk shape having a larger diameter than the shaft diameter of the shaft portion 12. The head 18 has an engaging portion (not shown) that can be engaged with a driver bit of a fastening tool such as a screw driver that uses power or compressed air as a power source at the center of the surface thereof. The engaging part is constituted by an engaging groove part having a cross hole groove shape, for example.
Note that the shape of the engaging portion (not shown) of the head 18 is not limited to the cross hole groove shape, and the shape of the engaging portion can be engaged with the driver bit of the tightening tool. It may be formed in other various shapes.

  Further, on the other end side of the shaft portion 12 in the axial direction, a drill portion 22 that can be drilled by rotating the head portion 18 in the direction opposite to the screwing rotation direction of the screw portion 14 is formed. The drill part 22 is connected to the tip part 22A having a predetermined tip angle and the tip part 22A, and gradually increases in diameter toward the drill part side edge 22B, and extends from the tip part 22A to the drill part side edge 22B. It includes a cutting blade 22C to be formed, and a discharge groove 22D that discharges chips by cutting of the cutting blade 22C. The drill screw 10A has a configuration of a left cutting edge that can be drilled and cut by rotating counterclockwise (left rotation) when viewed from the head 18 in the axial direction.

Next, a fastening method for fastening the fastened member W2 to the thin plate base material W1 using the drill screw 10A described above will be described below with reference to FIG.
First, a thin plate base material W1 such as a thin plate base steel plate and a member to be fastened W2 such as wood are overlapped, and the tip 22A of the drill portion 22 of the drill screw 10A is a thin plate base as shown in FIG. It is applied to the surface of the material W1. In this case, the engaging portion (not shown) of the head 18 of the drill screw 10A is engaged with a driver bit (not shown in FIG. 2) attached to the fastening tool.

  In this state, the drill screw 10A is then rotated counterclockwise (counterclockwise) when viewed from the head 18 in the axial direction of the drill screw 10A, as shown in FIG. It enters into the fastened member W2. As shown in FIGS. 2B and 2C, the drill screw 10A has a tip portion 22A that penetrates the thin plate base material W1, and until just before the screw portion 14 of the drill screw 10A reaches the thin plate base material W1. Then, it enters the fastened member W2 and the thin plate base material W1 while rotating counterclockwise (counterclockwise). Therefore, by the drill part 22, as shown in FIG.2 (C), the thin-plate base material W1 is provided with the through-hole H1, and the to-be-fastened member W2 is provided with the fool hole H2.

  Then, the drill screw 10A is viewed from the head 18 in the axial direction of the drill screw 10A as shown in FIG. 2 (C), just before the screw portion 14 reaches the through hole H1 of the thin plate base material W1. It is rotated in the opposite direction to the previous rotation direction, that is, clockwise (right rotation). At this time, the thin plate base material W1 is provided with a screw hole S1 on its peripheral surface. The screw hole S1 has a female screw surface to be screwed with the screw portion 14 of the drill screw 10A. Accordingly, the drill screw 10A is in a state in which the screw portion 14 is screwed into the through hole H1 of the thin plate base material W1, and fastens the thin plate base material W1 and the fastened member W2.

Next, an example of a building screw fastening tool that is used in the above-described method for fastening the drill screw 10A and uses power or compressed air as a power source and a method for fastening the drill screw 10A using the fastening tool will be described with reference to FIG. To do.
First, the fastening tool 100 will be described. The construction screw fastening tool 100 includes a screw driver 120 using, for example, electric power or compressed air as a power source. The screw driver 120 includes, for example, a driver bit 140 that is engaged with the engaging portion of the head 18 of the drill screw 10A described above, a bit holder 160 that detachably fixes and holds the driver bit 140 to the screw driver 120, a bit Rotation transmitting means (not shown) that transmits a rotational driving force to the holder 160 to make the bit holder 160 rotatable, and a driving unit (not shown) that applies a rotational driving force that can rotate forward and reverse to the rotation transmitting means. ). In the drive unit, the power source of the drive unit is turned ON / OFF by operating the trigger switch 120A.

  The fastening tool 10 includes a support slider 180 that is detachably disposed at an end portion of the screw driver 120 and supports the screw driver 120, and a scale shaft portion 200 in which the support slider 180 can move. As shown in FIG. 3A, the scale shaft portion 200 is arranged in parallel so that one end 200A in the axial direction and the tip portion 22A of the drill portion 22 of the drill screw 10A are located on the same plane. The plane is the measurement reference plane X.

  The support slider 180 has a movement distance in which the tip 22A of the drill portion 22 of the drill screw 10A moves in the screwing direction from the surface of the fastened member W2 with the head 18 of the drill screw 10A engaged with the driver bit 140. Is incorporated as a moving displacement amount of the support slider 180 that allows the screw driver 120 to move along the scale shaft portion 200 with respect to the scale shaft portion 200. The detection means includes a detection electrode (not shown) for detecting the amount of movement displacement as an electric signal and a capacitive encoder (not shown). The detection electrode and the encoder are built in the scale shaft portion 200. ing. Further, the screw driver 120 has a built-in rotation direction control unit (not shown) that receives the electric signal detected by the detection means and switches the rotation direction of the rotation driving force to one of the normal rotation direction and the reverse rotation direction. Yes.

  In this fastening tool 100, as shown in FIG. 3 (A), the length of the drill portion 22 is L1 when viewed in the axial direction of the shaft portion 12 of the drill screw 10A, and the thickness of the fastened member W2 is T1. When the detecting means detects that the movement distance of the tip 22A of the drill screw 10A has reached the movement distance of [L1 + T1], the rotation direction of the rotation driving force from the drive section is appropriately switched by the rotation direction control section. It has become.

Next, a method of fastening the drill screw 10A for fastening the member W2 to be fastened to the thin plate base material W1 with the drill screw 10A shown in FIG. 1 by using the above-described building screw fastening tool will be described.
First, the head 18 of the drill screw 10 </ b> A is engaged with the driver bit 140, and the drill screw 10 </ b> A is attached to the screw driver 120. Next, the tip end portion 22A of the drill portion 22 of the drill screw 10A and the axial end 200A of the scale shaft portion 200 are brought into contact with the surface of the thin plate base material W1 as shown in FIG.

  Then, the trigger switch 120A of the screw driver 120 is operated to rotate the drill screw 10A counterclockwise (counterclockwise) when viewed from the head 18 in the axial direction of the drill screw 10A, whereby the drill portion 22 is fastened. W2 and the thin plate base material W1 are entered. In this case, as shown in FIG. 3 (B), the drill screw 10A uses the drill portion 22 to process the hole H2 in the fastened member W2 and the through hole H1 in the thin plate base material W1 [processing step].

Furthermore, when the detecting means detects that the moving distance of the tip 22A of the drill screw 10A has reached the moving distance [L1 + T1] as shown in FIG. The rotation direction of the rotational driving force from the head is switched, and the drill screw 10A rotates clockwise (right rotation) when viewed from the head 18 in the axial direction of the drill screw 10A, and the screw portion 14 of the drill screw 10A is a thin plate base material. Screwed into the through hole H2 of W2. In this case, the drill screw 10A is rotated in the direction opposite to the rotation direction in the previous processing step, as shown in FIG. 3C, just before the screw portion 14 reaches the through hole H1 of the thin base material W1. Then, the screw portion 14 is screwed into the thin plate base material W1. That is, the screw portion 14 of the drill screw 10A is screwed into the screw hole S1 of the thin plate base material W1, and the thin plate base material W1 and the fastened member W2 are fastened [screwing step].
Therefore, according to the fastening method of the drill screw 10A described above, the thin plate base material W1 and the fastened member W2 are fastened smoothly and stably without causing a jack-up phenomenon (main effect). In addition, in this case, it is not necessary to carefully screw in while allowing the jack-up phenomenon as in the conventional case, so that the screwing time is shortened and the number of man-hours can be reduced, and the construction time is shortened. can do.

  Further, since the drill screw 10A is provided with a plurality of cutting ribs 20 having a blade-like ridge line portion on the neck portion 16 in a trumpet shape, when the drill screw 10A is screwed in, the cutting rib 20 causes the neck portion 16 to A portion of the surrounding fastened member W2 is cut, and, for example, as shown in FIG. Therefore, the head 18 of the drill screw 10A can be easily screwed in until it slightly sinks from the surface of the fastened member W2. In this case, since the hole H2 is processed in the fastened member W2 by the cutting action of the drill part 22 and the chip (chip) discharging action of the discharge groove part 22D, the head 18 sinks to the surface side of the fastened member W2. It is easy. As a result, together with the cutting action by the plurality of cutting ribs 20 of the neck portion 16, the surface of the fastened member W2 is unlikely to rise when the head portion 18 sinks.

  Furthermore, according to the fastening method of the drill screw 10A described above, for example, as shown in FIG. 4, compared to the case where the hole H is formed in the fastened member W2 with the conventional reamer drill screw 1 shown in FIG. Since the diameter of the hole H2 provided in the member W2 can be reduced, the contact area of the contact portion Y between the neck portion 16 of the drill screw 10A and the inner peripheral surface g of the recess G can be increased. (Secondary effect 1). Therefore, the to-be-fastened member W2 is not crushed by the neck 16 and the head 18, and the fastening strength of the drill screw 10A can be increased.

Moreover, since the diameter of the hole H2 provided in the fastened member W2 can be reduced, as shown in FIG. 4, the drill screw 10 </ b> A is fastened in the hole H <b> 2 in the radial direction of the shaft portion 12 as shown in FIG. 4. Even when the deviation of the drill screw 10A occurs, the amount of deviation due to the deviation is small. Therefore, even when an external force is applied in the diameter direction of the shaft portion 12 after the drill screw 10A is fastened, the displacement amount of the drill screw 10A in the same direction can be extremely reduced (secondary effect 2). As a result, it is possible to increase the rigidity of the thin plate base material W1 and the fastened member W2 fastened by the fastening method of the drill screw 10A.
Therefore, according to the fastening method of the drill screw 10A, the thin plate base material W1 and the fastened member W2 are fastened more firmly and securely by the drill screw 10A due to the secondary effect 1 and the secondary effect 2 described above. Is done.

  In the fastening method described above, for example, as shown in FIG. 3A, when the thickness of the thin plate base material W1 is t and the length of the drill portion 22 of the drill screw 10A in the axial direction is L1, L1> The length L1 in the axial direction of the drill portion 22 is set so as to be t.

FIG. 6 is a main part illustrative view showing another aspect of the fastened member fastened to the base material by the fastening method according to the present invention and showing the fastening method of the fastened member and the base material.
In the embodiment shown in FIG. 6, compared to the above-described embodiment, in particular, the other fastening member W3 such as a thin steel plate is further arranged on the upper surface of the fastening member W2, and the drill screw 10B is Compared with the drill screw 10A described above, the point that the neck 17 is not provided with the cutting rib 20 is different. In the embodiment example shown in FIG. 6 as well, the jack-up phenomenon can be prevented similarly to the above-described embodiment example, so that the fastened member W2 and the fastened member W3 can be smoothly and stably attached to the thin plate base material W1. It becomes possible to conclude. Therefore, also in this embodiment example, the construction time can be shortened as in the above-described embodiment example.

FIG. 7 is a front view showing an example of another embodiment (drill screw) according to the present invention. Compared with the embodiment example shown in FIG. 1, the drill screw 10 </ b> C of the embodiment example shown in FIG. 7 is particularly characterized in that the screw portion 24 is formed with a male screw surface that becomes, for example, a left screw, and the drill portion 22. It is different in that it is a configuration of a right cutting edge that can be perforated and cut by rotating clockwise (right rotation) when viewed from the head 18 in the axial direction.
In the fastening method of the drill screw 10C in which the fastening member W2 is fastened to the thin plate base material W1 with the drill screw 10C shown in FIG. 7 by using the above-described building screw fastening tool 100, the above-described processing steps are performed by the drill screw 10C. By rotating counterclockwise (counterclockwise) when viewed from the head 18 in the axial direction of the drill screw 10C, the drill portion 22 causes the hole W2 to be fastened to the fastened member W2 and the through-hole to the thin plate base material W1. H1 is processed. Further, in the screwing process, before the screw portion 24 reaches the through hole H1 of the thin plate base material W1, the head portion 18 is rotated in the screwing rotation direction of the screw portion 24, whereby the screw portion 24 is attached to the thin plate base material W1. It is to be screwed.

  FIG. 8 is a front view showing an example of still another embodiment (wood screw) according to the present invention. In the embodiment shown in FIG. 1, the building screw 10 is formed by a drill screw 10A. However, the embodiment screw shown in FIG. 8 is different in that the building screw 10 is formed by a wood screw 10D. Yes. That is, the wood screw 10D shown in FIG. 8 is disposed on one end side in the axial direction, and includes a shaft portion 26 having a head portion 32 that can be engaged with a driver bit via a neck portion 30, and the shaft portion 26. The head part 32 is formed on the other end side in the axial direction of the screw part 28 formed on the peripheral surface, for example, with a right-hand thread, and the head part 32 is rotated in the direction opposite to the screwing rotation direction of the screw part 28. For example, a pointed portion 34 is included as a drill portion that can be perforated. The pointed portion 34 is connected to the tip portion 34A having a tip angle of 25 degrees, for example, and the tip portion 34A, and gradually increases in diameter toward the lower end side edge of the shaft portion 26, and from the tip portion 34A to the shaft portion 26. And a tapered portion 34B formed over the lower end side edge.

Next, an example of a fastening method in which a fastening member 100 is used to fasten a fastened member W5 such as a wood-based plywood to a base material W4 such as wood using the wood screw 10D described above with reference to FIGS. This will be briefly described below with reference to FIG.
First, the head 32 of the wood screw 10D is engaged with the driver bit 140, and the wood screw 10D is attached to the screw driver 120. Next, the tip end portion 34A of the pointed portion 34 of the wood screw 10D and one end 200A in the axial direction of the scale shaft portion 200 are brought into contact with the surface of the fastened member W5 as shown in FIG. Then, the trigger switch 120A of the screw driver 120 is operated, and the wood screw 10D is rotated counterclockwise (counterclockwise) when viewed from the head 32 in the axial direction of the wood screw 10D. As shown in FIG. 10 (B), the pointed portion 34 enters the fastened member W5 and the base material W4. In this case, the wood screw 10 </ b> D processes the hole H <b> 5 in the fastened member W <b> 5 by the sharpened tip 34 [processing step].

Furthermore, when the length of the pointed portion 34 is L2 as viewed in the axial direction of the shaft portion 26 of the wood screw 10D and the thickness of the fastened member W5 is T2, the moving distance of the tip portion 34A of the wood screw 10D is: As shown in FIGS. 10A and 10B, when the detecting means detects that the movement distance [L2 + T2] has been reached, the rotation direction control unit determines the rotation direction of the rotation driving force from the drive unit. The wood screw 10D is rotated in the clockwise direction (right rotation) when viewed from the head 32 in the axial direction of the wood screw 10D, and the screw portion 28 of the wood screw 10D is screwed into the base material W4. In this case, substantially at the same time when the pointed portion 34 enters the base material W4, the screw portion 28 of the wood screw 10D has the screw portion 28 shown in FIGS. 9B, 9C, 9D, and 10B. ), As shown in FIG. 10C, it is screwed into the base material W4. That is, the screw portion 28 of the wood screw 10D is screwed into the screw hole S4 of the base material W4, and the base material W4 and the fastened member W5 are fastened [screwing step].
Therefore, according to the fastening method of the wood screw 10D described above, the base material W4 and the fastened member W5 are smoothly and stably fastened without causing a jack-up phenomenon.

  According to the present invention, for example, as shown in each of the above-described embodiments, the jack-up phenomenon can be prevented, so that a metal base material such as a thin base steel sheet can be used for wood, plywood, OSB, wood wool board. Drill screws suitable for fastening fastened members such as hard wood wool cement boards and ceramics outer wall materials, or wood screws suitable for fastening the fastened members to a woody base such as wood The fastening method of the building screw and the building screw is obtained.

DESCRIPTION OF SYMBOLS 10 Construction screw 10A, 10B, 10C, 10D Drill screw 10D Wood screw 12, 26 Shaft part 14, 24, 28 Screw part 16, 17, 30 Neck part 18, 19, 32 Head part 20 Cutting rib 22 Drill part 22A, 34A Tip Part 22B Drill side edge 22C Cutting edge 22D, 22E Discharge groove part 34 Pointed part 34A Tip part 34B Taper part 100 Fastening tool 120 Screw driver 140 Driver bit 160 Bit holder 180 Support slider 200 Scale shaft part G Concave part G Concave circumference Surface H1 Through-hole H2, H5 Fool hole S1, S4 Screw hole L1 Length in the axial direction of the drill portion L2 Length in the axial direction of the pointed portion T1 Thickness of the fastened member W2 T2 Thickness of the fastened member W5 t Thin plate base material W1 thickness W1 Thin plate base material W2 Fastened member W3 Other fastened Workpieces X measurement reference plane Y abutment of the thin plate such as a base material W5 plywood such as wood W4 timber

Claims (7)

A shaft portion that is disposed on one end side in the axial direction and has a head portion that can be engaged with a driver bit,
A threaded portion formed on the peripheral surface of the shaft portion, and formed on the other end side in the axial direction of the shaft portion, and can be drilled by rotating the head portion in the direction opposite to the screwing rotation direction of the threaded portion. An architectural screw comprising a drill part.   The building screw according to claim 1, wherein the screw portion includes a right screw, and the drill portion includes a drill screw having a left cutting edge configuration.   The building screw according to claim 1, wherein the screw portion includes a left screw, and the drill portion includes a drill screw having a configuration of a right cutting blade.   The building screw according to claim 1, wherein the screw portion includes a right screw or a left screw, and the drill portion includes a wood screw having a pointed portion. A fastening method for a building screw for fastening a member to be fastened to a base material using the building screw according to any one of claims 1 to 3,
The head of the building screw is rotated in a rotation direction opposite to the screwing rotation direction of the screw portion of the building screw, and a drill hole is formed in the fastened member by the drill portion. A processing step of processing a through hole in the material, and after a drill hole is processed in the member to be fastened by the drill portion and the through hole is processed in the base material, the screw portion reaches the through hole of the base material A screwing method for a building screw, comprising: a screwing step of screwing the screw part into the base material by rotating the head in a screwing rotation direction of the screw part before performing. A fastening method for a building screw, wherein a fastening member made of non-metal is fastened to a wooden base material using the building screw according to claim 4,
A processing step in which the head portion of the building screw is rotated in a rotation direction opposite to a screwing rotation direction of the screw portion of the building screw, and a hole is formed in the fastened member by the pointed portion. And, after processing a fool hole in the wooden base material at the pointed portion, the head portion is rotated in the screwing rotation direction of the screw portion substantially simultaneously with the pointed portion entering the wooden base material. A method for fastening a building screw, comprising a screwing step of screwing the screw portion into the wood base material. A fastening tool for a building screw that is used in the method for fastening a building screw according to claim 5 or 6 and uses electric power or compressed air as a power source,
The fastening tool is:
A bit holder for fixing and holding a driver bit engaged with the head of the building screw;
A screw driver having a rotation transmitting means for transmitting a rotational driving force to the bit holder and allowing the bit holder to rotate; and a drive unit for applying a rotational driving force capable of forward and reverse rotation to the rotation transmitting means;
A support slider that is detachably disposed at an end portion of the screw driver, and that supports the screw driver; and a scale shaft portion that allows the support slider to move,
In the support slider, in the state where the head of the building screw is engaged with the driver bit, the moving distance of the tip of the building screw moved in the screwing direction from the surface of the fastened member, Detection means for detecting the displacement of the support slider with respect to the scale shaft portion that allows the screw driver to move along the scale shaft portion is incorporated,
The screw driver has a built-in rotation direction control unit that receives a detection signal detected by the detection means and switches the rotation direction of the rotation driving force to one of a normal rotation direction and a reverse rotation direction,
When the length of the drill part or the pointed part is L, and the thickness of the fastened member or the thickness of the wooden base material is T, as viewed in the axial direction of the shaft part of the drill screw, the building The rotational direction of the rotational driving force is switched by the rotational direction control unit when the detection means detects that the movement distance of the tip of the screw has reached the movement distance of [L + T]. Fastening tool.

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