Fixture and fixing structure for waterproof sheet or heat insulating material
A simplified fastener system with grooves and claws on the fixing disk provides self-locking properties to prevent male screw loosening, maintaining secure attachment of waterproof and insulating materials on roofs.
Patent Information
- Application Number
- JP2024115670
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2026-01-29
AI Technical Summary
Existing fasteners for waterproof and heat insulating materials on roofs are prone to loosening due to vibrations, particularly when using male screws, leading to potential detachment of sheets.
A simplified fastener system comprising a fixing disk with a through hole and counterbore for a male screw, featuring grooves or projections and claws that bend only in the tightening direction, providing self-locking properties to resist loosening.
The system effectively prevents male screw rotation and loosening, ensuring the waterproof or insulating material remains securely fastened even under vibrational forces.
Smart Images
Figure 2026014531000001_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to a fastener for a waterproof sheet or a heat insulating material used to fasten a waterproof sheet or a heat insulating material with a male screw on the rooftop, roof, veranda, balcony, etc. of a building, and to a fastening structure for a waterproof sheet or a heat insulating material using the same. [Background technology]
[0002] Roof waterproofing using PVC or other waterproofing sheets can be done using adhesive bonding, or mechanical fixing, which uses fixing disks and male screws to secure the waterproofing sheet to the roof. Mechanical fixing can be divided into two types: pre-cast mechanical fixing, in which a fixing disk is fixed to the roof with male screws and then the fixing disk and the waterproofing sheet are fixed by heat fusion or adhesive bonding, and post-cast mechanical fixing, in which the waterproofing sheet is laid out on the roof, and then a fixing disk is fixed on top of the waterproofing sheet with male screws and the fixing disk part is secured in place with a waterproof patch.
[0003] In the sheet waterproofing machine fixing method, it has been reported that when the waterproofing sheet is blown by the wind, vibrations cause force to be applied to the male screw, leading to loosening of the male screw, so measures are needed.
[0004] In addition, in asphalt waterproofing and urethane waterproofing, loosening of the male screws is known to occur even in steel base insulation waterproofing methods in which insulation material is fixed to a metal roof with male screws.
[0005] Various methods have been proposed to solve the problem of loosening of the male thread. For example, JP-A-2022-527543 (Patent Document 1) discloses a fastener assembly including a screw member, a first locking member including ratchet teeth, and a second locking member with spring fingers. [Prior art documents] [Patent documents]
[0006] [Patent Document 1] Special Publication No. 2022-527543 Summary of the Invention [Problem to be solved by the invention]
[0007] However, the fastener of Patent Document 1 is a complex assembly that includes screws, gears, claws, and a lock ON / OFF mechanism. [Means for solving the problem]
[0008] In this invention, the screw and the gear are made common by knurling the screw, and the structure is simplified by eliminating the locking ON / OFF mechanism because the screw is not removed.Furthermore, when the fixing disk moves due to vibration of the waterproof sheet, the claws of the fixing disk interfere with the knurled part of the screw, which encourages rotation in the direction of tightening the screw, giving the screw a self-locking property.
[0009] The present invention (I) is a fastener for a waterproof sheet or a heat insulating material used to fasten a waterproof sheet or a heat insulating material to a substrate, The fixing device for the waterproof sheet or insulation includes a fixing disk and a male screw; The fixing disk has a through hole for inserting the shank of the male screw and a counterbore for accommodating the head of the male screw, The external thread has a head, a threaded portion, and a cylindrical portion between the head and the threaded portion; The cylindrical portion has a plurality of grooves or linear projections extending in a direction parallel to or oblique to the axis of the male screw, The fixing disk has a plurality of claws extending toward the through hole around the through hole on a surface opposite to the surface having the counterbore, The claws can bend only in the direction of rotation in which the male screw tightens when the male screw is inserted into the fixing disk and rotated. When a male screw is inserted into the fixing disk, the free ends of the claws of the fixing disk engage with the grooves or linear protrusions of the male screw, and in the direction in which the male screw is tightened, the claws flex, releasing the engagement and allowing the male screw to rotate, but in the direction in which the male screw is loosened, resistance to rotation of the male screw is generated by the engagement.
[0010] The present invention (II) is a fixing structure for a waterproof sheet or a heat insulating material, which includes a substrate, a waterproof sheet or a heat insulating material, a fixing disk, and a male screw for fixing the fixing disk to the substrate, The fixing disk has a through hole for inserting the shank of the male screw and a counterbore for accommodating the head of the male screw, The external thread has a head, a threaded portion, and a cylindrical portion between the head and the threaded portion; The cylindrical portion has a plurality of grooves or linear projections extending in a direction parallel to or oblique to the axis of the male screw, The fixing disk has a plurality of claws extending toward the through hole around the through hole on a surface opposite to the surface having the counterbore, The claws can bend only in the direction of rotation in which the male screw tightens when the male screw is inserted into the fixing disk and rotated. When a male screw is inserted into the fixing disk, the free ends of the claws of the fixing disk engage with the grooves or linear protrusions of the male screw, and in the direction in which the male screw is tightened, the claws flex, releasing the engagement and allowing the male screw to rotate, but in the direction in which the male screw is loosened, resistance to rotation of the male screw is generated by the engagement.
[0011] The present invention includes the following embodiments. [1] A fixing device for waterproof sheets or thermal insulation materials used to fix waterproof sheets or thermal insulation materials to a substrate, The fixing device for the waterproof sheet or insulation includes a fixing disk and a male screw; The fixing disk has a through hole for inserting the shank of the male screw and a counterbore for accommodating the head of the male screw, The external thread has a head, a threaded portion, and a cylindrical portion between the head and the threaded portion; The cylindrical portion has a plurality of grooves or linear projections extending in a direction parallel to or oblique to the axis of the male screw, The fixing disk has a plurality of claws extending toward the through hole around the through hole on a surface opposite to the surface having the counterbore, The claws can bend only in the direction of rotation in which the male screw tightens when the male screw is inserted into the fixing disk and rotated. When a male screw is inserted into the fixing disk, the free ends of the claws of the fixing disk engage with the grooves or linear protrusions of the male screw, and in the direction in which the male screw is tightened, the claws flex, disengaging the engagement and allowing the male screw to rotate, but in the direction in which the male screw is loosened, resistance to rotation of the male screw is generated by the engagement. Fixings for tarpaulin or insulation. [2] The claws are formed of leaf spring material. A fixing device for a waterproof sheet or heat insulating material as described in [1]. [3] A fixing device for a waterproof sheet or insulating material described in [1] or [2], in which the fixing disk has a wall portion on one side of the claw, opposite to the rotational direction in which the claw can bend, that prevents the claw from bending. [4] A fixing device for a waterproof sheet or heat insulating material described in any one of [1] to [3], wherein the free end of the claw is facing the center of the through hole, or the free end of the claw is tilted in the direction of rotation in which the male screw is tightened rather than in the direction toward the center of the through hole. [5] A fixing device for a waterproof sheet or heat insulating material described in any one of [1] to [4], in which a protrusion or cover is provided on the side of the fixing disk opposite to the side having the countersunk recess to prevent interference between the claws and the fixed member that comes into contact with the side of the fixing disk opposite to the side having the countersunk recess when the fixing disk is arranged. [6] A fixing device for a waterproof sheet or heat insulating material according to any one of [1] to [5], wherein the fixing disk comprises a metal core and a vinyl chloride resin layer coated on one side of the core, or is a metal disk, or is a resin disk. [7] A fixing device for a waterproof sheet or heat insulating material according to any one of [1] to [6], wherein the fixing disc has a circular outer peripheral shape. [8] A fixing structure for a waterproof sheet or a heat insulating material, comprising a substrate, a waterproof sheet or a heat insulating material, a fixing disk, and a male screw for fixing the fixing disk to the substrate, The fixing disk has a through hole for inserting the shank of the male screw and a counterbore for accommodating the head of the male screw, The external thread has a head, a threaded portion, and a cylindrical portion between the head and the threaded portion; The cylindrical portion has a plurality of grooves or linear projections extending in a direction parallel to or oblique to the axis of the male screw, The fixing disk has a plurality of claws extending toward the through hole around the through hole on a surface opposite to the surface having the counterbore, The claws can bend only in the direction of rotation in which the male screw tightens when the male screw is inserted into the fixing disk and rotated. When a male screw is inserted into the fixing disk, the free ends of the claws of the fixing disk engage with the grooves or linear protrusions of the male screw, and in the direction in which the male screw is tightened, the claws flex, disengaging the engagement and allowing the male screw to rotate, but in the direction in which the male screw is loosened, resistance to rotation of the male screw is generated by the engagement. Fixed structure of waterproof sheet or insulating material. [Effects of the Invention]
[0012] The fixing device for waterproof sheets or heat insulating materials of the present invention can prevent the male screw from rotating and loosening, and further has a self-fastening property in that when the fixing disk moves due to vibration of the waterproof sheet or heat insulating material, the claws of the fixing disk interfere with the grooves or linear protrusions on the cylindrical part of the male screw, encouraging the male screw to rotate in the tightening direction. The waterproof sheet or heat insulating material fixing structure of the present invention is less likely to loosen and come off due to rotation of the male screw. [Brief explanation of the drawings]
[0013] [Figure 1] FIG. 1 is a perspective view of the bottom of the fixing disk. [Figure 2] FIG. 2 is a perspective view of the top surface of the fixing disk. [Figure 3] FIG. 3 is a perspective view of the male screw. [Figure 4] FIG. 4 is a perspective view of the fixing disk with the male screw inserted therein, as viewed from the bottom side. [Figure 5] FIG. 5 is a diagram showing an image of self-fastening property due to vibration. [Figure 6] FIG. 6 is a cross-sectional view of a waterproof sheet fixing structure using a pre-cast mechanical fixing method. [Figure 7] FIG. 7 is a cross-sectional view of a waterproof sheet fixing structure using a post-cast mechanical fixing method. DETAILED DESCRIPTION OF THE INVENTION
[0014] The present invention will be described in detail below with reference to the drawings, but the present invention is not limited to those shown in the drawings. Fig. 1 is a perspective view of the bottom of the fixing disk, Fig. 2 is a perspective view of the top of the fixing disk, and Fig. 3 is a perspective view of the male screw. Fig. 6 is a cross-sectional view of the fixing structure for the waterproof sheet using the pre-cast mechanical fixing method, and Fig. 7 is a cross-sectional view of the fixing structure for the waterproof sheet using the post-cast mechanical fixing method. The present invention (I) is a fastener for a waterproof sheet or a heat insulating material used to fasten a waterproof sheet 23 or a heat insulating material 22 to a substrate, The fixing device for the waterproof sheet or insulation material includes a fixing disk 1 and a male screw 10, The fixing disk 1 has a through hole 2 for inserting a shaft portion 11 of the male screw 10 therethrough and a counterbore 3 for accommodating a head portion 12 of the male screw 10. The external thread 10 has a head 12, a threaded portion 13, and a cylindrical portion 14 between the head and the threaded portion. The cylindrical portion 14 has a plurality of grooves or linear projections 15 extending parallel to or oblique to the axis of the male screw, The fixing disk 1 has a plurality of claws 4 extending toward the through hole 2 around the through hole 2 on the surface opposite to the surface having the counterbore 3, The claws 4 can bend only in the rotation direction in which the male screw 10 is tightened when the male screw 10 is inserted into the fixing disk 1 and rotated. When the male screw 10 is inserted into the fixing disk 1, the free ends of the claws 4 of the fixing disk 1 engage with the grooves or linear protrusions 15 of the male screw 10, and in the direction in which the male screw 10 is tightened, the claws 4 bend, disengaging the engagement and allowing the male screw 10 to rotate, but in the direction in which the male screw 10 is loosened, resistance to rotation of the male screw 10 is generated by the engagement.
[0015] The fixing disk 1 has a through hole 2 and a counterbore 3 . Because the through hole 2 is for inserting the shank 11 of the male screw 10, the diameter of the through hole 2 is the same as or slightly larger than the diameter of the shank 11 of the male screw 10. The diameter of the through hole 2 is not limited as long as the effects of the present invention are achieved, but is preferably 3 to 12 mm, more preferably 4 to 10 mm, and even more preferably 5 to 8.5 mm. Since the counterbore 3 is a recess that accommodates the head 12 of the male screw 10, the shape of the counterbore 3 is a shape that fits the head 12 of the male screw 10. Conversely, the male screw 10 that is used should match the shape and dimensions of the counterbore 3. The shape and dimensions of the countersunk hole 3 are not limited as long as they are suitable for accommodating the head 12 of the male screw 10, but the diameter of the countersunk hole 3 on the upper surface of the fixing disk 1 is preferably 5 to 24 mm, more preferably 8 to 20 mm, and even more preferably 12 to 16 mm.
[0016] The outer peripheral shape of the fixing disk 1 in plan view is not limited as long as it achieves the effects of the present invention, and may be circular, elliptical, square, rectangular, regular hexagonal, regular octagonal, or other polygonal shapes, but is preferably circular. When the outer peripheral shape of the fixing disk 1 in a plan view is circular, the outer diameter of the fixing disk 1 is not limited as long as the effects of the present invention are achieved, but is preferably 45 to 120 mm, more preferably 50 to 110 mm, and even more preferably 55 to 100 mm. The thickness of the fixing disk 1 is not limited as long as the effects of the present invention are achieved, but is preferably 1 to 12 mm, more preferably 1.5 to 8 mm, and even more preferably 2 to 5 mm.
[0017] The fixing disk 1 has a plurality of claws 4 extending toward the through hole 2 around the through hole 2 on the surface opposite to the surface having the counterbore 3. The fixing disk 1 in Fig. 1 has three claws 4, but the number of claws 4 is not limited to three. The number of claws 4 is not limited as long as the effects of the present invention are achieved, but is preferably 2 to 12, more preferably 2 to 9, and even more preferably 3 to 6.
[0018] The claws 4 can bend only in the rotation direction in which the male screw 10 tightens when the male screw 10 is inserted into the fixing disk 1 and rotated. When the fixing disk 1 is viewed from above, the rotation direction in which the male screw 10 tightens is clockwise if the male screw 10 is a right-handed thread, and counterclockwise if the male screw 10 is a left-handed thread. The fixing disk 1 in Fig. 1 has a wall portion 5 that prevents the pawl 4 from bending on one side of the pawl 4, opposite to the rotational direction in which the pawl 4 can bend. By having the wall portion 5, the pawl 4 can bend only in the rotational direction in which the male screw 10 is tightened. However, the method for making the pawl 4 bend only in the rotational direction in which the male screw 10 is tightened is not limited to the wall portion 5, and other methods may be used.
[0019] The free ends of the pawls 4 preferably face the center of the through hole 2, or are inclined in the rotation direction in which the male screw 10 tightens rather than in the direction toward the center of the through hole 2. If the free ends of the pawls 4 are inclined in the rotation direction in which the male screw 10 tightens rather than in the direction toward the center of the through hole 2, the male screw 10 will be less likely to rotate in the loosening direction.
[0020] FIG. 4 is a perspective view of the fixing disk 1 with the male screw 10 inserted therein, as viewed from the bottom side. When the male screw 10 is inserted into the fixing disk 1, the free end of the pawl 4 enters the groove between two adjacent linear protrusions 15 of the male screw 10, i.e., engages with the linear protrusions 15 of the male screw 10. As the free end of the pawl 4 engages with the linear protrusions 15 of the male screw 10, the pawl 4 bends in the direction in which the male screw 10 tightens, disengaging the engagement and allowing the male screw 10 to rotate. However, in the direction in which the male screw 10 loosens, the wall portion 5 prevents the pawl 4 from bending, and the engagement generates resistance to rotation of the male screw 10 in the loosening direction. Therefore, the male screw 10 is unlikely to rotate in the loosening direction. In other words, according to the present invention, it is possible to prevent the male screw from rotating and loosening and coming off.
[0021] FIG. 5 is a diagram showing an image of self-fastening property due to vibration. When the fixing disk vibrates due to vibration of the waterproof sheet or insulation material, the relative positional relationship between the fixing disk 1 and the male thread 10 attempts to change, and the linear protrusions 15 receive force from the engaged pawls 4. Among the components of this force, a force in the direction that tightens the male thread 10 cannot bend the pawls 4, so a force is applied in the direction that tightens the male thread 10, but a force in the direction that loosens the male thread 10 bends the pawls 4, so no loosening force is applied to the male thread 10. Therefore, when the fixing disk vibrates due to vibration of the waterproof sheet or insulation material, the male thread 10 receives a force in the direction that tightens the pawls 4, but does not receive a force in the direction that loosens it, so the male thread rotates in the direction that tightens, and self-fastening properties are achieved.
[0022] It is preferable that a protrusion 6 or a cover be provided on the surface of the fixing disk 1 opposite to the surface having the countersunk 3 of the fixing disk 1 to prevent interference between the claws 4 and the fixed member that comes into contact with the surface opposite to the surface having the countersunk 3 of the fixing disk 1 when the fixing disk 1 is arranged. The fixing disk 1 in Fig. 1 has a protrusion 6. Although the protrusion 6 shown in Fig. 1 is annular, the shape of the protrusion 6 is not limited and may be any shape as long as it can prevent interference between the fixed member and the claws 4. The cover is not limited in shape or size as long as it can accommodate the claws 4. An example of a cover is one that is composed of the annular protrusion 6 shown in Fig. 1 and a disk having the same diameter as the annular protrusion 6.
[0023] The material from which the claws 4 are made is not limited as long as it can achieve the effects of the present invention, but the claws 4 are preferably made of a leaf spring material.
[0024] The material constituting the fixing disk 1 is not limited as long as it achieves the effects of the present invention, but the fixing disk preferably includes a metal core material and a vinyl chloride resin layer coated on one side of the core material, or is a metal disk, or is a resin disk. Examples of metals include iron, copper, stainless steel, brass, aluminum, magnesium, titanium, zinc, and composite materials and plated products thereof, with stainless steel being preferred. Examples of resins include hard vinyl chloride resin, nylon, and FRP (fiberglass reinforced plastic), with hard vinyl chloride resin being preferred.
[0025] The method for manufacturing the fixing disk 1 is not limited, but for example, the fixing disk 1 can be manufactured by welding together a disk-shaped part with a countersunk hole and a wall portion manufactured by punching the material that constitutes the fixing disk 1 to the thickness of the fixing disk 1, a claw-shaped part manufactured by shearing a wire leaf spring material, and a protrusion-shaped part manufactured by turning a steel pipe.
[0026] The male screw 10 has a head 12, a threaded portion 13, and a cylindrical portion 14 located between the head and threaded portions. The shank 11 of the male screw 10 refers to the portion of the male screw 10 excluding the head 12. The shank 11 of the male screw 10 includes the threaded portion 13 and the cylindrical portion 14. The cylindrical portion 14 has a plurality of grooves or linear protrusions 15 extending in a direction parallel to or oblique to the axis of the male thread. The male thread 10 in Figure 3 has a plurality of linear protrusions 15 on the cylindrical portion 14 extending in a direction parallel to the axis of the male thread. The pitch of the grooves or linear projections 15 is not limited as long as the effects of the present invention are achieved, but is preferably 0.5 to 4.0 mm, more preferably 0.5 to 3 mm, and even more preferably 0.5 to 2 mm at the portion farthest from the axis of the male thread. Here, the pitch of the grooves or linear projections refers to the distance between two corresponding points on adjacent grooves or linear projections. The height of the linear projections 15 is not limited as long as the effects of the present invention are achieved, but is preferably 0.5 to 4 mm, more preferably 0.5 to 3 mm, and even more preferably 0.5 to 2 mm. The depth of the groove is not limited as long as the effects of the present invention are achieved, but is preferably 0.5 to 4 mm, more preferably 0.5 to 3 mm, and even more preferably 0.5 to 2 mm. The length of the grooves or linear projections 15 is not limited as long as the effects of the present invention are achieved, but is preferably 3 to 20 mm, more preferably 4 to 15 mm, and even more preferably 5 to 10 mm. The number of grooves or linear protrusions 15 is not limited as long as the effects of the present invention are achieved, but is preferably 6 to 18, more preferably 6 to 15, and even more preferably 6 to 12.
[0027] The external screw 10 is selected so that its head 12 fits into the counterbore 3 of the fastening disk 1 . The shape and dimensions of the male screw 10 are not limited as long as the effects of the present invention are achieved, but the outer diameter of the threaded portion of the male screw 10 is preferably 3 to 10 mm, more preferably 4 to 9 mm, and even more preferably 5 to 8 mm, the outer diameter of the cylindrical portion of the male screw 10 is preferably 3 to 10 mm, more preferably 4 to 9 mm, and even more preferably 5 to 8 mm, the diameter of the head 12 of the male screw 10 in a plan view is preferably 5 to 24 mm, more preferably 8 to 20 mm, and even more preferably 12 to 16 mm, the length of the threaded portion 13 of the male screw 10 is preferably 10 to 180 mm, more preferably 30 to 120 mm, and even more preferably 40 to 80 mm, and the length of the cylindrical portion 14 of the male screw 10 is preferably 10 to 180 mm, more preferably 30 to 120 mm, and even more preferably 40 to 80 mm.
[0028] The material constituting the male thread 10 is not limited as long as it can achieve the effects of the present invention, but is preferably a metal, and more preferably stainless steel.
[0029] The method for producing the external thread 10 is not limited, but for example, the external thread 10 can be produced by knurling the cylindrical portion of the external thread.
[0030] The present invention (II) relates to a fixing structure 20 for a waterproof sheet or insulating material, which includes a substrate 21, a waterproof sheet 23 or insulating material 22, a fixing disk 1, and a male screw 10 for fixing the fixing disk to the substrate. The fixing disk 1 and the male screw 10 are the same as those used in the present invention (I).
[0031] The substrate 21 is preferably a roof substrate, more preferably a metal roof substrate.
[0032] The waterproof sheet 23 may be made of, but is not limited to, a vinyl chloride resin sheet, a vulcanized rubber sheet, a non-vulcanized rubber sheet, a thermoplastic elastomer sheet, a thermoplastic polyurethane elastomer sheet, an ethylene vinyl acetate resin sheet, an asphalt roofing sheet, etc., but is preferably a vinyl chloride resin sheet. The thickness of the waterproof sheet 23 is not limited to, but is preferably 0.3 to 10 mm, more preferably 0.5 to 5 mm, and even more preferably 1 to 3 mm.
[0033] The insulating material 22 is not limited to, but examples thereof include rigid urethane foam, polystyrene foam, phenol foam, glass wool, rock wool, wool press, carbonized cork, cellulose fiber, etc. The thickness of the insulating material 22 is not limited to, but is preferably 5 to 300 mm, more preferably 10 to 200 mm, and even more preferably 20 to 150 mm.
[0034] FIG. 6 is a cross-sectional view of a waterproof sheet fixing structure using a pre-cast mechanical fixing method. The waterproof sheet fixing structure 20 in Figure 6 includes a base 21, insulating material 22 provided on the base, fixing disks 1 scattered on the insulating material, external screws 10 for fixing the fixing disks and insulating material to the base, and a waterproof sheet 23 covering the insulating material and fixing disks.
[0035] The waterproof sheet fixing structure 20 of Figure 6 can be manufactured by, but is not limited to, laying insulation material 22 on a base 21, scattering fixing discs 1 on the insulation material 22, fixing the fixing discs 1 and insulation material 22 to the base 21 with male screws 10, covering the insulation material 22 and fixing discs 1 with a waterproof sheet 23, and then fixing the fixing discs 1 and waterproof sheet 23 by heat sealing.
[0036] FIG. 7 is a cross-sectional view of a waterproof sheet fixing structure using a post-cast mechanical fixing method. The waterproof sheet fixing structure 20 in Figure 7 includes a substrate 21, insulation material 22 placed on the roof substrate, a waterproof sheet 23 placed on the insulation material, fixing disks 1 scattered on the waterproof sheet, external screws 10 for fixing the fixing disks, waterproof sheet and insulation material to the roof substrate, and a patch 24 for covering the fixing disks.
[0037] The waterproof sheet fixing structure 20 of Figure 7 can be manufactured by, but is not limited to, laying insulation material 22 on a substrate 21, laying a waterproof sheet 23 on the insulation material 22, interspersing fixing discs 1 on the waterproof sheet 23, fixing the fixing discs 1, waterproof sheet 23 and insulation material 22 to the substrate 21 with male screws 10, and then covering the fixing discs 1 with patches 24. [Industrial Applicability]
[0038] The fastener of the present invention can be suitably used to fasten a waterproof sheet or a heat insulating material to a substrate. [Explanation of symbols]
[0039] 1 fixed disk 2 through holes 3. Reeling 4 Claws 5 Wall 6 protrusions 10 Male thread 11 Shaft 12 Head 13 Threaded section 14 Cylindrical part 15 Linear process 20 Waterproof sheet fixing structure 21 Base 22 Insulation 23 Tarpaulin 24 Patch
Claims
1. A waterproof sheet or heat insulating material fixing device used to fix a waterproof sheet or heat insulating material to a substrate, The fixing device for the waterproof sheet or insulation includes a fixing disk and a male screw; The fixing disk has a through hole for inserting the shank of the male screw and a counterbore for accommodating the head of the male screw, The external thread has a head, a threaded portion, and a cylindrical portion between the head and the threaded portion; The cylindrical portion has a plurality of grooves or linear projections extending in a direction parallel to or oblique to the axis of the male screw, The fixing disk has a plurality of claws extending toward the through hole around the through hole on a surface opposite to the surface having the counterbore, The claws can bend only in the direction of rotation in which the male screw tightens when the male screw is inserted into the fixing disk and rotated. When a male screw is inserted into the fixing disk, the free ends of the claws of the fixing disk engage with the grooves or linear protrusions of the male screw, and in the direction in which the male screw is tightened, the claws flex, disengaging the engagement and allowing the male screw to rotate, but in the direction in which the male screw is loosened, resistance to rotation of the male screw is generated by the engagement. Fixings for tarpaulin or insulation.
2. 2. The fastener for a waterproof sheet or a heat insulating material according to claim 1, wherein the claws are formed of a leaf spring material.
3. 2. The fixing device for a waterproof sheet or insulating material according to claim 1, wherein the fixing disk has a wall portion on one side of the claw, opposite to the rotational direction in which the claw can bend, that prevents the claw from bending.
4. 2. The fixing device for a waterproof sheet or a heat insulating material according to claim 1, wherein the free ends of the claws are directed toward the center of the through hole, or the free ends of the claws are inclined toward the direction of rotation in which the male screw is tightened rather than toward the center of the through hole.
5. A fixing device for a waterproof sheet or heat insulating material as described in claim 1, wherein a protrusion or cover is provided on the side of the fixing disk opposite to the side having the countersunk recess to prevent interference between the claws and the fixed member that comes into contact with the side of the fixing disk opposite to the side having the countersunk recess when the fixing disk is arranged.
6. 2. The fastener for a waterproof sheet or a heat insulating material according to claim 1, wherein the fastening disk comprises a metal core and a vinyl chloride resin layer coated on one side of the core, or is a metal disk, or is a resin disk.
7. 2. A fastener for tarpaulin or insulation according to claim 1, wherein the fastening disc has a circular outer periphery.
8. A fixing structure for a waterproof sheet or a heat insulating material, comprising a substrate, a waterproof sheet or a heat insulating material, a fixing disk, and a male screw for fixing the fixing disk to the substrate, The fixing disk has a through hole for inserting the shank of the male screw and a counterbore for accommodating the head of the male screw, The external thread has a head, a threaded portion, and a cylindrical portion between the head and the threaded portion; The cylindrical portion has a plurality of grooves or linear projections extending in a direction parallel to or oblique to the axis of the male screw, The fixing disk has a plurality of claws extending toward the through hole around the through hole on a surface opposite to the surface having the counterbore, The claws can bend only in the direction of rotation in which the male screw tightens when the male screw is inserted into the fixing disk and rotated. When a male screw is inserted into the fixing disk, the free ends of the claws of the fixing disk engage with the grooves or linear protrusions of the male screw, and in the direction in which the male screw is tightened, the claws flex, disengaging the engagement and allowing the male screw to rotate, but in the direction in which the male screw is loosened, resistance to rotation of the male screw is generated by the engagement. Fixed structure of waterproof sheet or insulating material.
Citation Information
Patent Citations
Locking mechanism having a bendable locking member
JP2022527543A