JP2019148330A - Fastening device, and fixing structure of soft material using the same - Google Patents

Abstract

To provide a fastening device superior in fixing strength of a soft material and excessive screwing prevention function.SOLUTION: Four engagement projections 12 are formed on a seating face 10 of a countersunk head 8 of a machine screw 6. A disc 5 has a tapered cylindrical portion 14 biting into a waterproof sheet 1, and a ring-shaped pressing portion 5a for pressing the water-proof sheet 1. A straight portion 15 is formed on an inner peripheral edge of the tapered cylindrical portion 14, and the tapered cylindrical portion 14 is provided with four engagement holes 16 to which the engagement projections 12 are fitted. The engagement holes 16 are closed holes not opened, so that the tapered cylindrical portion 14 keeps high rigidity, and is improved in a pressing function of the water-proof sheet 1. As the tapered cylindrical portion 14 and the straight portion 15 bite into the water-proof sheet 1 and a heat insulation material 2, a disc 5 is stopped in a prescribed state, and the engagement projections 12 can be firmly fitted into the engagement holes 16. Accordingly, excessive screwing can be surely prevented while securing high fastening strength.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fastening device having a disk and a screw and a fixing structure using the same, and is used for fixing a soft material such as a heat insulating material (or a waterproof sheet).

  In buildings, a heat insulating material is laid on a rooftop or a wall and covered with a waterproof sheet, and the waterproof sheet and the heat insulating material are generally pressed and fixed by a fastening device composed of a screw and a disk.

  As an example of a fastening device composed of a screw and a disk, Patent Document 1 discloses that a screw head is formed on a countersunk head, and a taper portion is formed on the inner peripheral edge of the disk so that the seat surface of the screw overlaps. In this configuration, a plurality of engaging protrusions that are separated in the circumferential direction are formed on the seating surface of the head of the screw, while the taper portion of the disk can be separated into tongue pieces having the same number of engaging protrusions. In this patent document 1, by deforming the tongue piece, the engagement protrusion can be engaged with the tongue piece to exhibit the loosening prevention function.

  On the other hand, when the base material for fixing the member such as the heat insulating material is a brittle material such as ALC or a structural material made of a thin steel plate, if the screw screwing torque is strong, the female screw of the base material is crushed. There may be a phenomenon that the fastening becomes impossible.

  In this regard, in Patent Document 2, in a structure in which a soft material is pressed and fixed to a base material with a workpiece (metal fitting) made of a metal plate or the like, an engagement protrusion is formed on the seat surface of the head of the screw, It is disclosed that an engagement groove into which an engagement protrusion is fitted is formed in a part of a work where a seat surface of a head portion overlaps. In this patent document 2, screw screwing rotation is prevented by fitting the screw engagement protrusion into the engagement groove of the workpiece, thereby preventing excessive screwing (too much driving).

JP 2007-16864 A JP 2017-129247 A

  Patent Document 1 has an excellent anti-loosening function, and Patent Document 2 has an excellent anti-screwing function (Note that Patent Document 1 also has an excessive screwing preventing function, and Patent Document 2 also has an anti-loosening function. It can be said that it has

  For example, taking Patent Document 1 as an example, the screw locking function is exhibited by the disc being held non-rotatable by a frictional force. Also, in the case of Patent Document 2, the function of preventing excessive screwing is exhibited by the work being held non-rotatable.

  Therefore, as an example of the development of Patent Document 2, when the work has a disk structure as in Patent Document 1, in order to more accurately exert the function of preventing excessive screwing, friction between the soft material with which the disks overlap is used. It is preferable to increase the force as much as possible. It is also preferable that the sealing function between the disc and the soft material is as high as possible.

  The present invention has been made to improve the current situation.

The present invention includes a number of configurations, the typical of which is specified in each claim. Of these, the invention of claim 1 relates to a fastening device,
“We have a disc and a self-piercing screw,
While projecting at least one engagement protrusion on the seat surface of the head of the screw,
The disc has a hole through which the shaft portion of the screw passes, and at least an inner peripheral edge of the hole is a cylindrical portion that bites into the soft material, and the screw of the disc is the screw. An engagement hole into which the engagement protrusion fits is formed at a portion where the heads of the two portions overlap.
It is the composition.

The invention of claim 2 is a preferred development of claim 1, and in this invention,
"While the head of the screw is a countersunk head with a tapered surface,
The portion of the disk where the seating surface of the head of the screw overlaps is a tapered cylindrical portion that bites into the soft material, and the engagement hole is formed in the tapered cylindrical portion. ''
It is the composition.

The invention of claim 3 is an expansion of claim 2;
“While the engagement protrusion is a long protrusion in the axial direction,
A cylindrical portion into which the lower neck of the screw is fitted is integrally connected to an inner peripheral edge of the tapered cylindrical portion of the disk, and the engagement hole is a long hole in the axial direction, and the cylindrical shape The division is not divided. ''
It is the composition.

The invention of claim 4 relates to a fixing structure that holds and holds a soft material on a base material via a fastening device composed of a disk and a countersunk head screw.
“While the screw has at least one engaging protrusion protruding from the seating surface of the head in the outer diameter direction,
The disc has a hole through which the shaft portion of the screw is inserted and a head portion seating surface of the screw overlaps, and a pressing portion that extends from the tube portion in the outer diameter direction and overlaps the soft material. An engagement hole that engages with the engagement protrusion of the screw is formed in the cylindrical portion,
With the cylindrical portion biting into the soft material and the engaging protrusion engaging with the engaging hole, the soft material spreading outside the outer periphery of the screw head is pressed by the pressing portion of the disk. Is there "
That's it.

  In the present invention, the basic action is the same as that of Patent Document 2, and when the screw is screwed with a power tool such as an electric type, the screw engagement protrusion is formed when the screw seating surface strongly presses the disk. And the engagement hole of the disk are fitted to each other, whereby the rotation of the screw is stopped and a strong resistance is generated in the power tool. Therefore, the operator can remove the finger from the trigger at that time and stop the rotation, and thus the screw can be screwed to an appropriate depth (that is, over-screwing can be prevented).

  Therefore, as in Patent Document 2, it is possible to automatically screw the screw to an appropriate depth. As a result, the base material is a brittle material such as ALC board concrete, ceramics or cement siding, brick, gypsum board, thin metal board, non-thick wood board, or relatively thin resin board Even if the material is not high in resistance to pulling out, it is possible to prevent fastening failure due to excessive screwing. In addition, a loosening prevention effect is also exhibited.

  The disk may rotate with the rotation of the screw. In the present invention, during the screwing of the screw, at least the cylindrical portion of the inner peripheral edge of the disk bites into the soft material. The frictional resistance increases quickly. Therefore, the rotation of the disk can be quickly stopped, and the engaging protrusion can be firmly fitted into the engaging hole. For this reason, it is possible to ensure the function of preventing excessive screwing (too much driving).

  In addition, since at least the cylindrical portion bites into the soft material, the adhesion between the disc and the soft material is increased, so that the sealing performance between the disc and the soft material can be improved. In addition, when fixing a soft material to a horizontal surface like construction on a roof, it is only necessary to drive a screw with a power driver without touching the disk at the time of construction. In the above, this construction mode is premised, but it is also possible to drive a screw in a state in which the disk is pressed against a soft material while being held by placing a hand on the disk.

  As for the head of the screw, various forms such as a hexagonal head and a pan head can be adopted. However, if the countersunk head is adopted as in claim 2, the top surface of the head can be submerged from the surface of the disk. , It is suitable for the site that hates the exposure (protrusion) of the screw head.

  According to the second aspect of the present invention, since the tapered cylindrical portion of the disk also enters the soft material, the effect of rapidly increasing the friction between the disk and the soft material in the screw screwing process is excellent. Accordingly, the rotation of the disk can be stopped in an appropriate state, and the function of preventing excessive screwing can be further improved.

  When the engagement protrusion and the engagement hole are formed in a shape elongated in the axial direction as in claim 3, the engagement between the engagement protrusion and the engagement hole can be ensured, and the function of preventing excessive screwing can be further improved (slack prevention). Function can also be improved.)

  Further, in claim 3, the cylindrical portion that bites into the soft material has a two-stage configuration of a tapered cylindrical portion and a cylindrical portion, but the engagement hole does not divide the cylindrical portion and is closed. Therefore, the rigidity of the tapered tube portion is high. Therefore, while ensuring that the cylindrical part and the tapered cylindrical part bite into the soft material, the engagement hole is prevented from expanding and deforming, and the engagement state between the engagement protrusion and the engagement hole is reliably realized. it can. Therefore, the function of preventing excessive screwing is further improved. Also, the fixing strength can be stabilized.

  Forming ribs that bite into the soft material in the pressing portion of the disk as in the embodiment has the advantage that the pressing effect of the soft material can be promoted and the rigidity of the disk can be increased by increasing the section modulus.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows embodiment, (A) is a partially broken isolation front view, (B) is a top view of a disk, (C) is a top view of a screw, (D) is a front view of the head of a screw, (E ) Is an EE view of (D). (A) is a longitudinal front view in the middle of construction, (B) is a longitudinal front view in a state where construction has been completed, (C) is a cross-sectional view taken along CC of (B), and (D) is (B). It is a principal part enlarged view. It is a figure which shows 2nd Embodiment, (A) is a top view, (B) is BB sectional drawing of (A), (C) is CC sectional drawing of (A). (A) is a top view of 3rd Embodiment, (B) is a BB view of (A), (C) is a figure which shows another example of an engagement protrusion. (A) is a top view of 4th Embodiment, (B) is a longitudinal front view of 5th Embodiment, (C) is a longitudinal front view of 6th Embodiment.

(1). First Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. First, the first embodiment shown in FIGS. In a building with external heat insulation, a heat insulating material is laid on the rooftop and walls and covered with a waterproof sheet. In the present embodiment, the heat insulating material 2 is formed of an ALC plate through the waterproof sheet 1. It is applied to a fastening device 4 for fixing to the material 3. The waterproof sheet 1 and the heat insulating material 2 correspond to the soft material described in the claims.

  The fastening device 4 includes a ring-shaped disk 5 that overlaps the waterproof sheet 1 and a screw 6 that holds and holds the disk. The screw 6 has a shaft portion 7 and a head portion 8 provided at one end thereof, and one screw thread 9 is formed on the outer periphery of the shaft portion 7 (a multi-thread screw may be used).

  The thread 9 has a pitch that is substantially the same as the valley diameter, and a smooth surface without the thread 9 is present in the valley. Further, the tip end portion of the shaft portion 7 is pointed, and the screw thread 9 reaches the tip end while gradually decreasing the height. Accordingly, the screw 6 is a wood screw type self-drilling type (a drill screw can also be used). A considerable portion of the shaft portion 7 that is close to the head portion 8 is a non-threaded portion with the same material diameter.

  The head 8 of the screw 6 is a dish type having a tapered seating surface 10 whose diameter is reduced toward the shaft portion 7, and a cross-shaped engagement hole 11 into which a bit is fitted is formed on the top surface. Yes. The engagement hole 11 may be a cross, hexagon, star, or the like.

  On the seat surface 10 of the head 8, four engagement protrusions 12 that are elongated in the axial direction are formed at equal intervals in the circumferential direction as screw-side rotation restricting means. Although the engagement protrusion 12 has a square cross section, it can also be formed in a trapezoidal flat shape or a triangular shape. Further, the protrusion height of the engaging protrusion 12 gradually decreases from the side close to the shaft portion 7 toward the outer periphery of the head 8. Therefore, it is triangular when viewed from the side. The lower end of the engagement protrusion 12 is located slightly above the lower end of the seat surface 10 (on the top surface side of the head 8). The cutting protrusion dimension of the engaging protrusion 12 is set to be approximately the same as the thickness of the disk 5.

  The disk 5 is a kind of washer. Therefore, a through hole (center hole) 13 through which the shaft portion 7 of the screw 6 is inserted is vacant in the center portion. The portion of the disk 5 where the seat surface 10 of the screw 6 overlaps is formed in the tapered cylindrical portion 14 by burring, and the neck lower portion of the screw 6 is fitted to the inner peripheral edge of the tapered cylindrical portion 14. The part 15 is connected integrally. A portion of the disk 5 that extends outside the tapered cylindrical portion 14 is a ring-shaped pressing portion 5 a that holds the waterproof sheet 1.

  The tapered cylindrical portion 14 is formed with four engagement holes 16 into which the engagement protrusions 12 are fitted at equal intervals in the circumferential direction. Although the engaging hole 16 is a long hole in the axial direction, the straight portion 15 is not divided, and the straight portion 15 has a continuous loop structure without interruption in the circumferential direction. For this reason, the tapered cylindrical portion 14 has high rigidity in spite of having the engagement hole 16.

(2). Summary When holding and fixing the waterproof sheet 1 and the heat insulating material 2 using the fastening device 4, in the case of construction on the roof, the disk 5 is rotated at a predetermined position while the screw 6 is rotated by a transmission driver. The waterproof sheet 1 and the heat insulating material 2 may be passed through and screwed into the base material 3. Until the engagement protrusion 12 of the screw 6 hits the tapered cylindrical portion 14 of the disk 5, the disk 5 remains on the waterproof sheet 1, and the straight portion 15 and the tapered cylindrical portion 14 contact the waterproof sheet 1 and the heat insulating material 2. I don't bite.

  2 shows a state in which the straight portion 15 and the tapered cylindrical portion 14 have bite into the waterproof sheet 1 and the heat insulating material 2, but this is for convenience, and the head of the screw 6 is actually used. In a state where the portion 8 is not hit, the disk 5 is only placed on the waterproof sheet 1.

  When the engaging protrusion 12 of the screw 6 hits the tapered cylindrical portion 14 of the disk 5, the engaging protrusion 12 is fitted into the engaging hole 16, and the disk 5 rotates together with the screw 6. For this reason, the disk 5 is pressed by the waterproof sheet 1 and the heat insulating material 2, and the straight portion 15 and the tapered cylindrical portion 14 bite into the heat insulating material 2 while bending the waterproof sheet 1.

  Since the frictional resistance between the waterproof sheet 1 and the disk 5 increases due to the pressing to the waterproof sheet 1, the rotation of the disk 5 stops halfway, and only the screw 6 rotates, and the engagement protrusion of the screw 6 The movement of 12 once disengaging from the engagement hole 16 and fitting into the next engagement hole 16 is performed one or more times, and then the screwing resistance becomes very large.

  That is, the engagement protrusion 12 fits into the engagement hole 16 with a clicking feeling, and then the resistance to the rotation of the screw 6 increases rapidly. It can be grasped sensuously that it was screwed up. Therefore, by removing the finger from the trigger and stopping the rotation of the screw 6 at that time, the waterproof sheet 1 and the heat insulating material 2 can be pressed and fixed by the disk 5 without destroying the female screw of the base material 3.

  It is assumed that the engagement protrusion 12 is first screwed to a predetermined depth while being fitted in the engagement hole 16, but in this case as well, the disk 5 is fixed to the waterproof sheet 1 and the heat insulating material 2 to some extent. When pressed, the frictional resistance between the waterproof sheet 1 and the disk 5 becomes very large, so that it is difficult to rotate the screw 6 and the disk 5 together under normal torque. In general, the rotation is stopped when the resistance to the rotation increases abruptly, thereby preventing over-screwing.

  In the case of wall construction, the screw 6 is driven with the operator holding the disk 5 in a predetermined position by hand. When the screw 6 starts to bite into the base material 3, the disk 5 is held by hand. The disk 5 is pressed and held by screwing the screws 6.

  In this embodiment, the seat surface 10 of the head of the screw 6 is tapered, while the tapered cylindrical portion 14 of the disk 5 is entirely submerged on the heat insulating material 2 side. There are no protrusions on the top surface. Further, since the disk 5 is usually sunk into the heat insulating material 2 by screwing the screw 6, the disk 5 and the head 8 of the screw 6 can be prevented from projecting to the construction surface. For this reason, it is suitable for the site which dislikes a protrusion.

  Temporarily, the engagement hole 16 can be cut into the downward direction by dividing the straight portion 15, but in this case, the tongue piece divided by the engagement hole 16 is separated from the axis. There is a risk of spreading and deforming. However, in this embodiment, since the taper-shaped cylinder part 14 has penetrated into the inside of the heat insulating material 2, a big resistance arises with respect to the spreading deformation of a tongue piece. Therefore, even if the engagement hole 16 is cut open by dividing the straight portion 15, the engagement protrusion 12 gets over while hitting the plurality of tongue pieces, and as a result, the screwing depth becomes too deep. Such a phenomenon does not occur.

  Therefore, even if the engagement hole 16 is cut downward, the predetermined screwing depth can be maintained to prevent the female screw from being broken. However, when the straight portion 15 is formed in a continuous loop structure as in the embodiment, the taper is tapered. It is possible to prevent excessive deformation of the cylindrical tube portion 14 and reliably prevent over-screwing.

  Further, as in the embodiment, when the engagement protrusion 12 is formed in a triangular shape in a side view so that the projecting dimension of the lower end is the highest, the engagement protrusion 12 hits the tapered cylindrical portion 14. Further, it is possible to facilitate the elastic deformation of the tapered cylindrical portion 14 and promote the fitting of the engagement protrusion 12 into the engagement hole 16. Therefore, in this invention, there exists an advantage that the engagement of the engagement protrusion 12 to the engagement hole 16 can be made easy, improving the rigidity of the taper-shaped cylinder part 14 by making the engagement hole 16 into a closed type. .

  When the protrusion dimension of the engagement protrusion 12 is varied depending on the height position, the variation aspect can be arbitrarily set, for example, the upper and lower intermediate portions are set to be the highest. Further, as shown in FIG. 4C as a modified example, the engaging protrusions 12 may be set at the same height over the entire length.

(3). Other Embodiments Next, other embodiments of FIG. 3 and the following will be described. The second embodiment shown in FIG. 3 embodies claims 4 and 5, and, in addition to the configuration of the first embodiment, extends radially 4 to the pressing portion 5a outside the cylindrical portions 14 and 15. The ribs 17 are formed at equal intervals in the circumferential direction. Each rib 17 has an arc shape in cross section, protrudes on the same side as the tapered cylindrical portion 14 (downward), and bites into the waterproof sheet 1 (and the heat insulating material 2. Therefore, the rib 17 has a reinforcing function, It has a function to hold down the waterproof sheet 1 firmly.

  In the present embodiment, the ribs 17 have a length slightly shorter than the radius of the disk 5, and have the same distance between the tapered cylindrical portion 14 and the outer periphery. Therefore, the whole bulges below the ring-shaped portion. It is formed at a position shifted from the engagement hole 16 by 45 degrees in the circumferential direction.

  The position and number of ribs 17 can be set arbitrarily. In addition to or instead of being provided as a solid line, it is possible to form a rib 17 on the outer side of each engagement hole 16 as shown by a one-dot chain line. The rib indicated by the alternate long and short dash line is shorter in length than the rib 17 indicated by the solid line, but may be set to the same length as the rib 17 indicated by the solid line.

  The ribs 17 are also formed in the third embodiment shown in FIGS. 4A and 4B, but in this embodiment, the ribs 17 extend to the outer periphery of the disk 5. In the third embodiment, a rib 17 indicated by a one-dot chain line in FIG.

  The ribs 17 in the above embodiment extend radially, but the ribs 17 can also be formed in a ring shape or an arc shape extending annularly. In this case, the number of ribs 17 may be one (or one row), or a plurality of ribs 17 may be formed concentrically.

  In the fourth embodiment shown in FIG. 5A, two engagement protrusions 12 are formed on both sides of the shaft center, and four engagement holes 16 are formed at intervals of 90 degrees. When the numbers of the engagement protrusions 12 and the engagement holes 16 are made different as described above, the number of the engagement holes 16 may be an integral multiple of the number of the engagement protrusions 12. The engagement protrusions 12 and the engagement holes 16 may be provided at intervals of 120 degrees, respectively.

  In the fifth embodiment shown in FIG. 5B, the straight portion 15 of the first embodiment is not provided, and only the tapered cylindrical portion 14 is provided as a cylindrical portion that bites into the soft material, and the tapered cylindrical portion is provided. Four engagement holes 16 are formed in the portion 14 in a closed manner. Therefore, also in this example, the tapered cylindrical portion 14 has high rigidity.

  In the sixth embodiment shown in FIG. 5C, the head 8 of the screw 6 is formed as a hexagonal head with a flange, and four engaging protrusions 12 extending in the radial direction are formed on the seating surface 10. ing. On the other hand, a straight portion 15 that bites into the soft material is formed in the inner peripheral portion of the disc 5, and an engagement hole 16 is formed in a portion of the disc 5 where the head portion 8 overlaps. The engagement hole 16 is a closed system that does not divide the straight portion 15. In this embodiment, the engagement protrusion 12 has the highest downward protrusion height on the axial center side, and the downward protrusion height decreases outward.

  The present invention can be embodied in various ways. For example, the engagement protrusion does not need to have an elongated shape, and a hemispherical shape or the like can also be adopted (in this case, the engagement hole may be a long hole method or a round hole method). . The disk does not need to be a washer, and may be a plate (metal fitting) having some function as exemplified in Patent Document 2. Accordingly, it is possible to use one disk and a plurality of screws as a set.

  The present invention can be embodied in a fastening device. Therefore, it can be used industrially.

1 Waterproof sheet (soft material)
2 Heat insulation material (soft material)
3 Base material (ALC plate)
DESCRIPTION OF SYMBOLS 4 Fastening device 5 Disc 5a Press part 6 Screw 7 Shaft part 8 Head part 9 Screw thread 10 Seat surface 12 Engagement protrusion 13 Through hole 14 Tapered cylindrical part 15 Straight part 16 Engagement hole 17 Rib

Claims (4)

A fastening device for holding and fixing a soft material,
It has a disc and a self-piercing screw,
While projecting at least one engagement protrusion on the seat surface of the head of the screw,
The disc has a hole through which the shaft portion of the screw passes, and at least an inner peripheral edge of the hole is a cylindrical portion that bites into the soft material, and the screw of the disc is the screw. An engagement hole into which the engagement protrusion fits is formed in a portion where the head of the
Fastening device. While the head of the screw is a countersunk head having a tapered surface that is tapered,
The part of the disk where the head seating surface of the screw overlaps is a tapered cylindrical part that bites into the soft material, and the engagement hole is formed in the tapered cylindrical part.
The fastening device according to claim 1. While the engagement protrusion is a long protrusion in the axial direction,
A cylindrical portion into which the lower neck of the screw is fitted is integrally connected to an inner peripheral edge of the tapered cylindrical portion of the disk, and the engagement hole is a long hole in the axial direction, and the cylindrical shape The division is not divided,
The fastening device according to claim 2. A fixing structure that holds and holds a soft material on a base material through a fastening device composed of a disk and a countersunk head screw,
While the screw has at least one engaging protrusion protruding from the seating surface of the head in the outer diameter direction,
The disc has a hole through which the shaft portion of the screw is inserted and a head portion seating surface of the screw overlaps, and a pressing portion that extends from the tube portion in the outer diameter direction and overlaps the soft material. An engagement hole that engages with the engagement protrusion of the screw is formed in the cylindrical portion,
With the cylindrical portion biting into the soft material and the engaging protrusion engaging with the engaging hole, the soft material spreading outside the outer periphery of the screw head is pressed by the pressing portion of the disk. Yes,
Fixed structure of soft material.

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