JP2014074429A - Fastening member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening member which does not require a specified tool and a particular operation and, even when a screw hole is enlarged temporarily by a typhoon or the like, can be prevented from coming out from roof material or the like.SOLUTION: A fastening member 1 includes: a screw shank 2 which is formed of a thread 21 on an outer circumferential surface; and a screw head part 3 which is disposed on the rear edge of the screw shank 2. Therein, an expanding piece 4 which is split so as to go along the shank line from a predetermined position in the longitudinal direction of the screw shank 2 toward the tip direction, is provided with an elastic force and is expanded in the radial direction.

Description

  TECHNICAL FIELD The present invention relates to a fastening member that is suitable for fastening a roofing material of a building, for example, to prevent a screw hole from being loosened after fastening the member.

  The inventor has proposed various devices for maintaining heat insulation more effectively when heat insulating materials are attached as building walls or roofing materials. For example, Japanese Patent Laid-Open No. 2008-298281 (Patent No. 4208095) proposes an invention relating to a heat insulating structure for fixing a roofing material or the like by developing a heat insulating washer made of a metal member as shown in FIG. Patent Document 1). According to this patent, by fastening a roofing material or a wall material to a building via a heat insulating washer, high heat insulation between the inside and outside of the building can be maintained, and the occurrence of a heat bridge phenomenon can be suppressed.

JP 2008-298281 A

  However, the invention described in Patent Document 1 is an invention mainly related to a washer for heat insulation, and since a fastening member for fastening this employs a general screw, there remains a problem caused by looseness of the screw. ing. For example, in recent years, a surprising typhoon has caused damage to not only ordinary houses but also large buildings such as buildings and airports. One of the causes is that the roof is repeatedly lifted by typhoons and strong winds, so that the screw holes that are fastened to the roofing material are expanded, the screws are loosened, the tightening effect is reduced, and the roofing material is blown away. . Accordingly, there is a need for an improved fastening member that can withstand such large typhoons.

  The present invention has been made to meet such a need for improvement, and does not require a special tool or special operation, and even if the screw hole is expanded by a typhoon or the like, the roof An object of the present invention is to provide a fastening member that can prevent the material from falling off.

  A fastening member according to the present invention is a fastening member comprising a screw shaft portion having a thread formed on an outer peripheral surface thereof and a screw head portion provided at a rear end of the screw shaft portion. It has a spreading piece that is divided along the axis from a predetermined position in the longitudinal direction of the part along the axis, and that is spread in the radial direction with an elastic force.

  As an aspect of the present invention, the outer diameter of the screw shaft portion on the front end side where the spread piece is formed is larger than the outer diameter of the screw shaft portion on the rear end side where the spread piece is not formed. It may be formed small.

  Furthermore, as one aspect of the present invention, the thickness of the spread piece may be smaller than the thickness of the screw shaft portion remaining by dividing the spread piece.

  According to the present invention, a special tool or special operation is not required, and even if the screw hole is enlarged due to a typhoon or the like, it is possible to prevent falling off from a roof material or the like.

It is a front view showing one embodiment of a fastening member concerning the present invention. It is a side view which shows the fastening member of this embodiment. It is the enlarged plan view seen from the screw head side which shows the fastening member of this embodiment. It is the expanded bottom view seen from the screw shaft part tip side which shows the fastening member of this embodiment. It is a front view which shows the state which the expansion piece in this embodiment shrunk by external force. It is a use condition figure which shows other embodiment in which the expansion piece was formed in the front end side rather than the center position of the screw shaft part. It is a use condition figure which shows other embodiment in which the expansion piece was formed in the rear end side rather than the center position of the screw shaft part. It is a front view which shows other embodiment in which the thickness of the expansion piece was formed smaller than the thickness of the screw shaft part which remains after dividing the expansion piece. It is a front view which shows the deck plate fastened with the fastening member of this embodiment, a roof material, and a washer. It is a perspective view which shows the washer in this embodiment. It is a fastening operation | work figure of this embodiment, Comprising: (a) The figure which shows the state which inserted the fastening member of this embodiment in the hollow accommodating part of a washer, (b) Pilot hole in a roof material by the sword tip part in this embodiment The figure which shows the operation | work which is screwed in a roofing material, while the expanded piece is diameter-reduced by the pressure from a roofing material, and the front-end | tip of the screw shaft part in this embodiment is penetrated from a roofing material. The figure which shows the operation | work engaged with a screw hole, (d) The figure which shows the state which penetrated the expansion piece in this embodiment from the screw hole of a deck plate, and completed the fastening operation | work. It is a use condition figure which shows the state by which the omission is prevented by the expansion piece in the fastening member of this embodiment. It is a use condition figure which shows the state fixed to the deck plate and the roofing material with the conventional fastening member.

  Hereinafter, an embodiment of a fastening member according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the fastening member 1 of the present embodiment includes a screw shaft portion 2 in which a screw thread 21 is formed, and a screw head portion 3 provided at the rear end of the screw shaft portion 2. And an expanding piece 4 that is divided in the radial direction by dividing the screw shaft portion 2. Hereinafter, each configuration will be described in detail.

  The screw shaft portion 2 is made of a metal material such as stainless steel or aluminum, and a screw thread 21 is formed on the outer peripheral surface thereof. Further, in this embodiment, since it is used as a tapping screw for forming the screw hole 51 in the roofing material or the like together with the fastening operation, as shown in FIG. 1 and FIG. 2, a piercing sword tip 22 is formed at the tip. ing.

  The screw thread 21 is formed in a spiral shape along the outer peripheral surface of the screw shaft portion 2, and conforms to standards such as the International Organization for Standardization (ISO) and the Japanese Industrial Standards (JIS). It is formed at a predetermined pitch and height. In this embodiment, as shown in FIGS. 1 and 2, the tip of the screw thread 21 is formed at an acute angle in order to be used as a tapping screw.

  In addition, as shown in FIG. 2, the screw shaft portion 2 has an outer diameter a on the front end side where the spread piece 4 is formed larger than an outer diameter b on the rear end side where the spread piece is not formed. It is formed small. In the present embodiment, the outer diameter a on the front end side of the screw shaft portion 2 is formed to be approximately 10% smaller than the outer diameter b on the rear end side. The outer diameters a and b are different from each other as described above. When the distal end side screw shaft portion 23 provided with the expanded piece 4 is screwed, a slight hole or the like is caused by the elastic force of the expanded piece 4. Therefore, by forming the rear end side screw shaft portion 24 to have a large diameter, it is intended to secure a fastening force by eliminating a gap with the expanded pilot hole or the like. There is also an intention to maintain or increase the strength of the screwed portion by increasing the diameter of the rear end side screw shaft portion 24.

  The screw head 3 engages with a rotary tool such as a wrench, spanner, and screwdriver, and transmits the rotational force received from the rotary tool to the screw shaft portion 2 according to standards such as ISO and JIS. It is formed in a different shape. As shown in FIGS. 3 and 4 as an example, the screw head 3 in the present embodiment is formed in a regular hexagon.

  As shown in FIG. 1, the spreading piece 4 is divided along the axis from a predetermined position in the longitudinal direction of the screw shaft portion 2 toward the distal end, and spreads in the radial direction with an elastic force. Has been. As shown in FIG. 5, the spread piece 4 is elastically deformed and contracted in diameter by receiving an external force in the radial direction.

  In addition, a thread 41 is formed on the outer surface of the spread piece 4, similarly to the screw shaft portion 2. As shown in FIG. 5, the thread 41 is formed so as to be continuous with the thread 21 formed on the screw shaft portion 2 in a state where the expanded piece 4 is reduced in diameter by an external force.

  The predetermined position of the screw shaft portion 2 where the spread piece 4 is formed is appropriately selected depending on the thickness and weight of the roof material to be fastened. For example, as shown in FIG. 6, when the roofing material is thick, it may be formed on the tip side from the center position. On the contrary, when the roofing material is thin, as shown in FIG. You may increase the ratio to form and may form in the screw head 3 side rather than a center position. In the present embodiment, as shown in FIG. 1, the screw shaft portion 2 is divided from a substantially central position in the longitudinal direction toward the distal direction.

  Further, strength consideration is also given to the thickness of the spread piece 4 and the thickness of the screw shaft portion 2 on the distal end side forming the spread piece 4. That is, it is desirable that the thickness c of the screw shaft portion 2 remaining after dividing the spread piece 4 is greater than the thickness d of the spread piece 4 provided with the screw threads 41. The thickness c of the screw shaft portion 2 shown in FIG. 1 is substantially equal to the thickness d of the spread piece 4 provided with the thread 41, but is not limited to this. For example, as shown in FIG. In order to prevent the screw shaft portion 2 from being bent by an external force, the thickness c of the screw shaft portion 2 may be formed thicker than the thickness d of the spread piece 4 provided with the screw threads 41.

  Furthermore, the formation method of the expansion piece 4 provided with the screw thread 41 is not specifically limited, You may form in the state expanded by forging, casting, etc., and the screw shaft part 2 is made with a cutter etc. You may divide | segment and form it radially expanding by plastic deformation, thermal deformation, etc. In order to divide the spread piece 4 along the axis with high accuracy, casting is more preferable.

  Next, the operation of each component of the fastening member 1 according to the present embodiment will be described in accordance with a work procedure for fastening the roof material 5 to the deck plate 6 by the fastening member 1 as shown in FIGS.

  First, the roof material 5, the deck plate 6, and the washer 7 fastened by the fastening member 1 of this embodiment will be briefly described. As shown in FIG. 9, the deck plate 6 is formed by bending a plate made of a metal material, and is fixed to a beam (not shown) on the ceiling of the building. The deck plate 6 is formed with a screw hole 61 for screwing the fastening member 1. The roofing material 5 is a hard urethane foam, a galvanized iron plate or the like having heat insulating properties, water resistance, etc., and is installed and fixed on the deck plate 6. The roof material 5 of the present embodiment is provided with a hole for fitting the washer 7. The washer 7 is made of a material suitable for the use site such as a metal material or a resin material, and has a hollow accommodating portion 72 having an insertion hole 71 and a flange portion 73 as shown in FIGS. 9 and 10. ing.

  Next, the work procedure to be fastened will be specifically described. First, as shown in FIG. 11 (a), the sword tip 22 on the distal end side of the fastening member 1 is directed toward the roof material 5 and is inserted into the insertion hole 71 in the hollow housing portion 72 of the washer 7. Make contact. At this time, the expanded piece 4 is not subjected to external force and is in an expanded state.

  Next, when a rotary tool (not shown) is engaged with the screw head 3 to apply a rotational force, as shown in FIG. A pilot hole is formed in the roof material 5. Further, the screw thread 21 of the screw shaft portion 2 is screwed into the lower hole formed by the sword tip portion 22 and is screwed forward while forming the screw hole 51.

  The expansion piece 4 receives a pressing in the center direction from a pilot hole formed in the roof material and reduces the diameter. As described above, the screw threads 41 on the outer surface of the spreading piece 4 form a screw thread continuous with the screw threads 21 of the screw shaft portion 2 by reducing the diameter. Therefore, the screw hole 51 formed in the roof material 5 becomes a continuous screw hole.

  However, the expansion piece 4 tends to expand in the radial direction by an elastic force. Therefore, the expanding piece 4 is slightly opened by the elastic force, and the screw hole 51 formed by the screw thread 41 of the expanding piece 4 is formed larger than the screw thread 21 of the tip side screw shaft portion 23. There is a fear. However, the outer diameter of the front-end side screw shaft part 23 in which the expansion piece 4 in this embodiment is formed is formed smaller than the outer diameter of the rear end side screw shaft part 24 in which the expansion piece 4 is not formed. Therefore, even if the screw hole 51 is formed in a state where the expanding piece 4 is slightly opened by the elastic force, the screw thread 21 equivalent to the rear end side screw shaft portion 24 is formed. Therefore, the fastening force between the rear end side screw shaft portion 24 and the roof material 5 is not reduced. Moreover, since the pressing force which the expansion piece 4 receives from a pilot hole becomes small because an outer diameter is small, it is easy to screw in.

  Next, as shown in FIG. 11C, the tip of the screw shaft portion 2 penetrates the roof material 5, and the screw thread 21 of the screw shaft portion 2 and the screw hole 61 of the deck plate 6 are screwed together. At this time, the spread piece 4 is pressed from the screw hole 51 formed in the roof material 5 and is also pressed from the screw hole 61 of the deck plate 6. Therefore, the expanded piece 4 remains reduced in diameter.

  As shown in FIG. 11 (d), when the spreading piece 4 penetrates the screw hole 61 of the deck plate 6, it is released from the pressure received from the screw hole 51 formed in the roofing material 5 or the screw hole 61 of the deck plate 6. Has been expanded. In this way, since the spreading piece 4 is automatically opened by the elastic force of the spreading piece 4, no special spreading operation with a tool other than the rotary tool is required.

  Then, the fastening member 1 is rotated to a necessary depth, and the screw 61 of the deck plate 6 and the screw 21 of the rear end side screw shaft portion 24 are screwed together, whereby the roof material 5 and the deck plate 6 are fastened. This completes the fastening operation.

  As shown in FIG. 12, when the screw hole 61 of the deck plate 6 becomes large due to vibration of the building, typhoon, strong wind, or the like after the fastening operation is completed, the screw hole 61 and the screw thread 21 of the screw shaft portion 2 The screwing is released. However, since the expanding piece 4 is expanded by the elastic force as described above, the expanding piece 4 is locked to the deck plate 6. Therefore, the fastening member 1 does not fall off the deck plate 6 or the roof material 5.

According to the present embodiment as described above, the following effects can be obtained.
1. Even if the screw holes 51, 61 are enlarged by the vibration of the building, typhoon, strong wind, etc. or the screwed state is loosened, the expanding piece 4 locks the roofing material 5 etc., so that the fastening member 1 Can be prevented and falling of the roofing material 5 and the like can be prevented.
2. Since the expanding piece 4 automatically expands due to its elastic force after passing through the object to be fastened such as the roofing material 5 or the like, there is no need for a separate expanding operation.
3. Since the outer diameter a of the front end side screw shaft portion 23 on which the expanded piece 4 is formed is smaller than the outer diameter b of the rear end side screw shaft portion 24, the expanded piece 4 is prepared as a lower hole during fastening. It is possible to prevent the pilot hole from being unnecessarily scraped when passing through and to be firmly screwed by the rear end side screw shaft portion 24 formed to have a large diameter, thereby securing a fastening force.
4). By increasing the thickness of the screw shaft portion 2 into which the spread piece 4 is divided, the bending strength of the shaft can be maintained, and the screw shaft portion 2 can be prevented from being bent or bent.

  In addition, the fastening member which concerns on this invention is not limited to one Embodiment mentioned above, It can change suitably.

  For example, the number of the spreading pieces 4 provided with the screw threads 41 in this embodiment is one piece, but may be a plurality of pieces (not shown).

DESCRIPTION OF SYMBOLS 1 Fastening member 2 Screw shaft part 3 Screw head 4 Expanded piece 5 Roof material 6 Deck plate 7 Washer 21 Screw thread 22 Blade tip part 23 Front end side screw shaft part 24 Rear end side screw shaft part 41 Screw thread 51 Screw hole 61 Screw Hole 71 Insertion hole 72 Hollow housing part 73 Flange part

Claims (3)

A fastening member composed of a screw shaft portion in which a screw thread is formed on the outer peripheral surface, and a screw head portion provided at the rear end of the screw shaft portion,
The fastening member which has the expansion piece divided | segmented so that it may extend along the axis line from the predetermined position of the longitudinal direction of the said screw shaft part toward the front end direction, and was extended in the radial direction with an elastic force.   The outer diameter of the screw shaft portion on the front end side where the spread piece is formed is smaller than the outer diameter of the screw shaft portion on the rear end side where the spread piece is not formed. The fastening member as described.   The fastening member according to claim 1 or 2, wherein a thickness of the spread piece is smaller than a thickness of a screw shaft portion remaining by dividing the spread piece.

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