JP6928941B2 - Screw sealing device using packing - Google Patents

Description

The present invention relates to a screw sealing device using a packing for stopping water from a fixed portion such as a roofing material with screws.

When using a headed screw such as a bolt to fix the roofing material to the structure, for example, the roofing material is provided with a mounting hole through which the shaft of the screw penetrates, and the screw inserted through this mounting hole is screwed into the structure. In this case, in order to prevent rainwater from entering through the mounting holes, a sealing device is interposed between the head of the screw and the roofing material, and the screw is tightened to compress the sealing device. The gap between the roof material and the roofing material is stopped.

The general structure of the sealing device as described above is formed by using an elastic material such as rubber, and is formed so as to insert the shaft portion of the screw, and the packing is compressed and protected by tightening the screw. In order to improve the water blocking performance of such a sealing device, the packing is formed into a substantially hemispherical shape, and the seat is made into a bowl shape that covers the packing from above. By making the central part through which the shaft part of the packing screw is inserted thicker, the characteristic of the substantially hemispherical shape of the packing is effectively utilized during compression, and the amount of compression deformation between the central part and the lower surface is increased. There are known sealing devices that increase the pressure contact force of the packing between the lower surface of the head and the seat and to the roofing material to improve the water blocking property of the mounting holes of the roofing material (see, for example, Patent Documents 1 and 2). ).

Further, in a sealing device consisting of a combination of a packing and a washer, in order to further improve the water stopping property of the roofing material on the lower surface of the packing, a plurality of annular protrusions are provided on the lower surface of the packing in a coaxial center arrangement to compress the packing. Occasionally, it has been proposed that the annular protrusion is pressed against the roofing material in a crushed manner (see, for example, Patent Document 3).

Jikken 1-28332 Gazette Jikken Sho 63-3454 Jikkenhei 7-38738

By the way, the packing of the sealing device as in Patent Documents 1 and 2 has a substantially hemispherical shape and its lower surface is a flat flat surface, and the packing is compressed by tightening the screws and the lower surface is pressed against the roofing material. In this case, unless the compressive force applied to the packing is evenly distributed over the entire lower surface and the entire lower surface is pressed against the roofing material, a sufficient water blocking effect cannot be expected.

However, although the screw that tightens the packing can uniformly compress the packing in a state where it is screwed perpendicularly to the roofing material, in an actual site, the screw is often screwed in an inclined manner.

When the screw is screwed in at an angle, the vertical compression of the packing by the underside of the head of the screw is biased, and the packing is strongly compressed on the inclined side of the screw but weak on the opposite side. The pressure contact force with respect to the roofing material varies depending on the location, which causes a problem that the water blocking property of the portion where the pressure contact force is weak is lowered.

That is, the packing is formed into a substantially hemispherical shape, and the washer is formed into a bowl shape that covers the packing from above, and the wall thickness of the central part of the packing is effectively used to improve the water stopping performance due to deformation during compression. In the case where the screw is screwed diagonally in the sealing device, the advantage of the thick structure of the central part of the substantially hemispherical shape adopted for the packing cannot be effectively utilized. ..

Further, the packing of the sealing device as in Patent Document 3 has a thin disk shape, and double inner and outer annular protrusions are provided on the lower surface thereof so that the downward protrusion heights are equal to each other, and the outer annular protrusion is the outer circumference of the packing. The inner annular protrusion is set to a position where the inner peripheral surface that spreads downward is continuous with the inner circumference of the screw insertion hole, and the packing compression force by tightening the screw is set. Is dispersed in each annular projection on the lower surface, so that each annular projection is crushed and pressure-welded to the roofing material, and such a double annular pressure-welding portion is intended to improve the water blocking property between the roofing material and the roofing material. It is a thing.

Here, the present inventor has made diligent research to further improve the water-stopping performance of a sealing device using a packing having a substantially hemispherical shape as in Patent Documents 1 and 2, as in Patent Document 3. Focusing on the water-stopping function of the double annular protrusions, we came up with the idea that it is preferable to use the annular protrusions as described in Patent Document 3 on the lower surface of the packing formed in a substantially hemispherical shape. rice field.

However, even if the annular projection as described in Patent Document 3 is provided as it is on the lower surface of the packing formed in a substantially hemispherical shape, it is desired as described below due to the shape characteristics of the substantially hemispherical packing. It turned out to be difficult to obtain an improvement in water stopping performance.

That is, the vertical thickness of the substantially hemispherical packing is thicker toward the center and the outer shape is retained by the bowl-shaped washer. However, the amount of compression in the portion close to the central portion increases, and if the position of the inner annular protrusion is set to be continuous with the inner circumference of the screw insertion hole as in Patent Document 3, this inner side is compressed during compression. The annular protrusion is pushed down so as to escape to the screw insertion hole side, so that the amount of pressure contact and pressure acting on the roofing material of the inner annular protrusion are reduced, and the improvement of water stoppage by the inner annular protrusion can be fully utilized. There will be no.

Further, when the substantially hemispherical packing is compressed, the outer peripheral portion of the lower portion tends to project outward from the gap between the lower edge of the washer and the roofing material due to the escape to the outside due to the compression. As described above, when the outer annular protrusion is located inside the outer circumference of the packing, the portion outside the outer annular protrusion at the lower part of the packing escapes from the gap to the outside of the washer without great resistance. Therefore, the amount of compression acting on the outer annular protrusion is reduced, and the improvement in water stopping property by the outer annular protrusion cannot be fully utilized.

Furthermore, when the screw that compresses the packing is screwed in at an angle, the downward protrusion height of the inner and outer annular protrusions is the same, and the outer annular protrusion is located inside the outer circumference of the packing. The lower part of the packing flows toward the side opposite to the inclination of the screw due to the large amount of compression on the inclined side of the screw, which increases the amount of protrusion of the washer from the gap between the lower edge of the washer and the roofing material to the outside. As a result, on the side opposite to the inclination of the screw, the pressure contact force of the outer annular protrusion with respect to the roof material is reduced, which causes a problem that the water blocking performance for the mounting hole through which the shaft portion of the screw penetrates is lowered. Become.

Therefore, the inventor of the present invention has been diligently researching further improvement of the water blocking performance of the sealing device composed of a combination of a packing formed in a substantially hemispherical shape and a bowl-shaped washer. We have found the above conditions and have completed a sealing device that does not cause deterioration of water stopping performance even when the screw is screwed in at an angle. Therefore, the present invention provides a sealing device having excellent water stopping performance. That is the issue.

In order to solve the above-mentioned problems, the present invention uses an elastic material, and a packing formed into a substantially hemispherical outer shape in which the upper surface side is a convex curved surface and the lower surface is flat, and the convex shape of the packing. It consists of a combination of bowl-shaped seats that have an inner peripheral surface to be joined to a curved surface and can be put on the packing from the upper surface. The seat mounting cylinder that protrudes upward from the top of the packing with the inner diameter matching the screw insertion hole, and the axial center and coaxial center in the vertical direction on the lower surface of the packing are arranged, and the one located on the outer peripheral side is lower. A plurality of annular protrusions are provided on the outermost surface of the packing, which are located on the lower surface of the outer peripheral portion, and the seat has a fitting hole for the seat mounting cylinder at the top thereof. In a screw sealing device using a packing that has a bowl shape that is shallower than the substantially hemispherical shape of the packing so that the annular protrusion packing located on the outermost side from the lower edge of the packing is exposed when it is mounted on the packing.
Among the above, the annular projection located on the innermost side of the annular projection has an arcuate lower tip, and the innermost diameter thereof is set to a range larger than the inner diameter of the washer mounting cylinder and smaller than the outer diameter. It is the one that was made.

Here, the packing is made of elastic rubber or synthetic resin, and a screw insertion hole having a diameter slightly larger than the outer diameter of the shaft portion of the screw penetrates along the axial center in the vertical direction and protrudes upward from the top. An annular collar is provided around the outer peripheral surface of the washer mounting cylinder near the upper end to prevent the washer from coming off, and the screw pushes down the upper end of the washer mounting cylinder with the lower surface of the head when screwing in, and the upper end of the washer mounting cylinder is pushed down through the washer. The packing is compressed, and the washer mounting cylinder is compressed outward by pressurization to seal between the lower surface of the screw head and the upper surface of the washer, and the upper end of the screw insertion hole is stopped from water.

Further, the washer is formed in a bowl shape using a metal material, and the lower inner diameter of the washer is formed under a condition that a slight gap is formed with respect to the lower outer diameter of the packing body, and the relief in the radial direction during compression is performed. By allowing the above, the amount of contraction stroke in the vertical direction is secured, and the innermost annular protrusion provided on the lower surface can be pressure-welded to the roofing material.

According to the present invention, in a screw sealing device consisting of a combination of a packing formed in a substantially hemispherical outer shape and a washer formed in a bowl shape that covers the packing from the upper surface, a plurality of annular rings are formed on the lower surface of the packing. Protrusions are provided, and the amount of the annular protrusion located on the outer peripheral side is higher, the annular protrusion located on the outermost side is located on the lower surface of the outer peripheral portion of the packing, and the annular protrusion located on the innermost side is. Since the lower tip is arcuate and the innermost diameter is set to be larger than the inner diameter of the washer mounting cylinder and smaller than the outer diameter, it is placed on the roofing material and located on the outermost side. When the annular protrusion is in contact with the roofing material and the pressure is applied from above by tightening the screw, the thick center side of the packing is efficiently lowered to surely push down the innermost annular protrusion. At this time, if the innermost diameter of the annular protrusion located on the innermost side is equal to or larger than the inner diameter of the washer mounting cylinder and less than or equal to the outer diameter, the position of the inner portion of the annular protrusion located on the innermost side is more efficient. This annular protrusion can be compressed to the outer diameter side, and the innermost annular protrusion can be securely pressed against the roofing material to ensure water stoppage by the innermost annular protrusion. can.

If the outermost annular protrusion is provided on the outer periphery of the lower surface of the packing, the outermost annular protrusion can be compressed at the inner position on the lower edge of the washer when the packing is compressed. By acting to close the gap between the edge and the roofing material from the inside, it prevents the packing from escaping to the outside of the washer from the gap, and by compressing the entire amount of the packing inside the washer, it is the best for the roofing material. The amount of pressure contact of the annular protrusions located on the outer side can be secured, and the water blocking property of the annular protrusions located on the outermost side can be improved. The performance of the sealing device using a substantially hemispherical packing can be significantly improved.

Further, when a plurality of annular protrusions are provided on the lower surface of the packing in a coaxial center-like arrangement so that the amount of the annular protrusions located on the outer peripheral side increases the amount of downward protrusion, the annular protrusions located on the outermost side. A large amount that can be compressed up and down can be secured, so that even if the screw is tilted and screwed in and the packing compression is biased, the part of the annular protrusion located on the outermost side opposite to the tilt of the screw. It is also possible to maintain water stoppage by pressure welding to the roofing material.

Longitudinal front view showing a state in which the packing and the washer forming the screw sealing device according to the present invention are separated into upper and lower parts. A partially cutaway front view showing an assembled state of the screw sealing device according to the present invention. A front view of a partially cutout in a used state in which the roofing material is fixed by using the screw sealing device according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the screw sealing device 1 of the present invention uses an elastic material such as rubber or synthetic resin, and has a low substantially hemispherical shape with a convex curved surface on the upper surface side and a flat lower surface. It is composed of a combination of a packing 2 formed on the outer shape and a washer 3 formed in a bowl shape having an inner peripheral surface joined to the convex curved surface of the packing 2 and being able to cover the packing 2 from the upper surface. For example, as shown in FIG. 3, when the roofing material 5 is fixed on the structure by using a screw 4 such as a bolt, the head portion 4b of the screw 4 is fitted in the shaft portion 4a of the screw 4. It seals between the lower surface and the roofing material 5 and waterproofs the penetrating portion of the screw 4 against the roofing material 5.

The packing 2 has a screw insertion hole 2b that penetrates the packing body 2a having a substantially hemispherical shape along an axial center in the vertical direction, and a top portion of the packing body 2a in a state where the inner diameter coincides with the screw insertion hole 2b. A washer mounting cylinder 2c protruding upward from the screw and a plurality of annular protrusions 2d and 2e arranged on the lower surface of the packing body 2a so as to be coaxial with the axial center in the vertical direction are provided, and the screw insertion holes 2b are used in combination. The diameter of the shaft portion 4a of the screw 4 is larger than the diameter of the shaft portion 4a, and a support rib 2f for holding the shaft portion 4a of the screw 4 is provided on the inner peripheral surface of the screw insertion hole 2b.

The washer mounting cylinder 2c projecting upward from the top of the packing body 2a has a projecting length longer than the thickness of the metal plate forming the washer 3, and the washer 3 comes off on the outer peripheral surface near the upper end thereof. An annular collar 2g that locks so as not to be provided is provided around the circumference, and the screw 4 is compressed by pushing down the upper end portion of the washer mounting cylinder 2c on the lower surface of the head 4b when screwing.

In the figure, the plurality of annular protrusions 2d and 2e provided on the lower surface of the packing main body 2a are provided close to the outermost annular protrusion 2d provided on the outer peripheral side of the packing and the outside of the screw insertion hole 2b. It is composed of inner and outer doubles of the annular protrusion 2e located on the innermost side, and the lower tip of each is arcuate. Is high. In addition to the illustrated examples, the plurality of annular protrusions 2d and 2e may have three or more inner and outer protrusions, and in this case, the ones located on the outer peripheral side are provided so that the amount of protrusion downward is higher.

The innermost inner diameter d of the annular protrusion 2e located on the innermost side means the diameter of the corner portion formed by the inner peripheral surface of the annular protrusion 2e and the lower surface of the packing body 2a, which is larger than the inner diameter of the washer mounting cylinder 2c. The diameter is set to be smaller than the outer diameter. That is, the washer mounting cylinder 2c has an inner diameter equal to that of the screw insertion hole 2b and an outer diameter larger than this, and the innermost diameter of the annular protrusion 2e is within the peripheral thickness of the washer mounting cylinder 2c. The conditions are set so that it fits in.

By the way, as an example, in the case of the packing body 2a formed to have a lower surface diameter of 20 to 25 mm, the washer is attached under the condition that the innermost diameter of the annular protrusion 2e located on the innermost side is about 9 to 13 mm. The diameters of the cylinder 2c and the screw insertion hole 2b are set, and in such a case, the annular protrusion 2e located on the innermost side is set to have a downward protrusion height of about 1 mm, whereas the annular protrusion 2e is located on the outermost side. The downward protrusion height of the annular protrusion 2d is set to about 3 mm, and the outer surface of the annular protrusion 2d located on the outermost side is formed so as to be continuous from the outer surface of the packing body 2a.

Next, the washer 3 described above is in a substantially hemispherical shape of the packing body 2a by using a metal plate material so that the annular protrusion 2d located on the outermost side is exposed from the lower edge of the washer 3 in the mounted state. It is formed in a suitable shallow bowl shape, and a fitting hole 3a for the washer mounting cylinder 2c is provided at the top thereof, so that the lower inner diameter of the washer 3 has a slight gap with respect to the lower outer diameter of the packing body 2a. It is formed under the conditions, and the outer circumference is slightly curved outward.

The screw sealing device 1 using the packing of the present invention has the above-described configuration, and is used, for example, to stop water at a portion where the roofing material 5 is fixed by the screw 4 on the structure. The screw 4 prepared for fixing the 5 can be screwed directly into the roofing material 5 at the fixing position of the structure and the roofing material 5 and then screwed into the structure, or the shaft of the screw 4 provided on the roofing material 5. It is fixed by inserting it into the partial insertion hole 5a and screwing it into the structure, and the shaft portion 4a having a diameter slightly smaller than that of the screw insertion hole 2b is used.

The sealing device 1 pushes the fitting hole 3a at the top into the washer mounting cylinder 2c while covering the packing 2 with the washer 3 from above to pass the annular flange 2g, and covers the outside of the packing 2 with the washer 3 to prevent both from coming off. Assembled in combination, the sealing device 1 is placed on the roof material 5 at the screwing position of the screw 4 or the shaft portion insertion hole 5a, and the shaft portion 4a of the screw 4 is screwed from the washer mounting cylinder 2c of the packing 2. It is screwed into the roofing material 5 through the insertion hole 2b to penetrate it, or it is inserted into the shaft portion insertion hole 5a. The sealing device 1 may be fixed on the roofing material 5 by performing the fixing work with the screw 4 in a state where the sealing device 1 is attached to the shaft portion 4a of the screw 4 in advance.

Since the support rib 2f is provided around the inner peripheral surface of the screw insertion hole 2b in the packing 2, a gap can be secured between the screw insertion hole 2b and the shaft portion 4a inserted therein, as shown in the drawing. If the cross-sectional shape is curved so that the inner circumference is lowered, the screw thread of the shaft portion 4a can prevent the inner circumference of the screw insertion hole 2b from being damaged during the insertion work of the shaft portion 4a, and the shaft portion can be prevented from being damaged with respect to the packing 2. There is no problem in pulling out 4a and re-fixing the sealing device 1, and the holding force of the support rib 2f can hold the mounting state of the sealing device 1 with respect to the shaft portion 4a. The handling of 4 becomes easy.

In the packing 2 mounted on the roof material 5, the annular protrusion 2d located on the outermost surface of the lower surface comes into contact with the roof material 5, and the lower surface of the packing body 2a and the annular protrusion 2e located on the innermost side rise from the roof material 5. When the screw 4 is screwed into the screw hole of the structure in this state, the lower surface of the head 4b pushes down the washer mounting cylinder 2c by this pushing force, and the washer mounting cylinder 2c is compressed by the washer 3 as shown in FIG. The entire packing 2 is pushed down, the washer mounting cylinder 2c is compressed so as to expand outward, and is sandwiched between the lower surface of the head 4b and the peripheral upper surface of the fitting hole 3a in the washer 3, and the lower surface of the head 4b. And the fitting hole 3a of the washer 3 are sealed.

Further, when the washer mounting cylinder 2c is pushed down, the initial pushing force acting on the packing body 2a becomes a tubular shape that matches the cross-sectional shape of the washer mounting cylinder 2c and acts on the lower portion of the packing. On the lower surface of the main body 2a, in a state where the outermost annular protrusion 2d is pressed onto the roofing material 5, the thick central portion above and below the packing main body 2a is efficiently lowered, thereby causing the maximum. The annular protrusion 2e located inside is lowered and pressed onto the roofing material 5, and at the same time, the washer 3 compresses the entire packing body 2a from above.

The innermost annular protrusion 2e has an arcuate lower tip, and its innermost diameter is set to be larger than the inner diameter of the washer mounting cylinder 2c and smaller than the outer diameter. When the inner portion of the packing body 2a has a tubular shape that matches the cross-sectional shape of the washer mounting cylinder 2c and the lower portion thereof is pushed down, the annular protrusion 2e located on the innermost side is subjected to a biased pushing down force. As a result, it is compressed so as to be inclined outward from the innermost diameter portion and does not project toward the screw insertion hole 2b side, so that the water blocking property between the packing main body 2a and the roofing material 5 can be improved.

When the screw 4 is further tightened in the above state, a compressive force is applied to the entire packing body 2a confined inside the washer 3, and the outermost and innermost annular protrusions 2d and 2e are compressed. As a result, the entire lower surface of the packing body 2a is pressed against the roofing material 5, and the space between the packing 2 and the roofing material 5 is double sealed inside and outside by the double annular protrusions 2d and 2e.

Further, the washer 3 has a bowl shape shallower than the substantially hemispherical shape of the packing body 2a so that the packing body 2a can be tightened, and a space for tightening allowance is provided between the lower edge of the washer 3 and the roofing material 5. Although it is formed, the annular protrusion 2d located on the outermost side is provided on the outer peripheral portion of the lower surface of the packing main body 2a, and the amount of protrusion downward from the annular protrusion 2e located on the innermost side is higher. An increase in the amount of compression at the outer peripheral portion of the packing main body 2a can be ensured, so that when the packing main body 2a is tightened, the annular protrusion 2d located on the outermost side is in contact with the roofing material 5 at the position of the lower inner circumference of the washer 3. It compresses between and acts to close the gap for the tightening margin formed between the lower edge of the washer 3 and the roofing material 5, and prevents the packing body 2a from escaping outward from the gap and protruding outward. By preventing the packing body 2a from being securely confined in the washer 3, the crimping efficiency on the roof material 5 can be improved.

As described above, in the fixed state of the roofing material 5 to which the screw 4 is tightened, the lower surface of the head 4b of the screw 4 and the top of the washer 3 are sealed by the washer mounting cylinder 2c compressed between them, and the packing main body is also used. Between the lower surface of 2a and the roofing material 5, the lower surface of the packing body 2a is crimped to the roofing material 5, and the inner and outer annular protrusions 2d and 2e are crushed to obtain double water blocking. It is possible to reliably waterproof the portion where the shaft portion 4a screwed through the roof material 5 or the shaft portion insertion hole 5a of the screw 4 provided in the roof material 5 in the case of the illustrated example.

Further, since the washer 3 covers the outside of the packing 2 and the washer mounting cylinder 2c in the packing 2 is made longer than the plate thickness of the washer 3 and protrudes to the upper surface, a sufficient amount of compression is secured. Moreover, the lower surface of the packing body 2a can be double-stopped by crushing the inner and outer annular protrusions 2d and 2e, so that the screw 4 is slightly tilted with respect to the sealing device 1. When screwed in, the packing body 2a can seal between the lower surface of the head 4b of the screw 4 and the top of the washer 3 by the washer mounting cylinder 2c even if the inclined side of the screw 4 is strongly compressed. Since the offset compression of the packing body 2a is evenly distributed by the bowl-shaped washer 3, it is possible to secure water stoppage by the annular protrusions 2d and 2e that are doubled inside and outside, and the sealing function by the inclination of the screw 4. Can be prevented from occurring.

1 Sealing device 2 Packing 2a Packing body 2b Screw insertion hole 2c Washer mounting cylinder 2d Outermost annular protrusion 2e Innermost annular protrusion 2f Support rib 2g Ring collar 3 Washer 3a Fitting hole 4 Screw 4a Shaft 4b Head 5 Roof material 5a Shaft insertion hole

Claims (1)

Using an elastic material, it has a packing formed in a substantially hemispherical outer shape with a convex curved surface on the upper surface side and a flat lower surface, and an inner peripheral surface joined to the convex curved surface of the packing. It consists of a combination of bowl-shaped washers that can be covered from the top surface.
The packing has a screw insertion hole penetrating along the vertical axis, a washer mounting cylinder protruding upward from the top of the packing with an inner diameter matching the screw insertion hole, and a vertical direction on the lower surface of the packing. The arrangement is coaxial with the axial center, and the one located on the outer peripheral side has a higher amount of downward protrusion, and the one located on the outermost side is provided with a plurality of annular protrusions located on the lower surface of the outer peripheral portion of the packing.
The washer is provided with a fitting hole for the washer mounting cylinder at the top thereof, and is a substantially hemisphere of the packing so that the annular projection packing located on the outermost side from the lower edge of the washer is exposed when the washer is mounted on the washer. In a screw sealing device that uses a packing that is shallower than the shape of the bowl,
Among the annular protrusions, the annular protrusion located on the innermost side has an arcuate lower tip, and the innermost diameter thereof is set in a range larger than the inner diameter of the washer mounting cylinder and smaller than the outer diameter. A screw sealing device using a packing.

Images