Blocking device

Abstract

To provide a blockage tool capable of filling gaps necessary for fixing a cover, such as one installed on a road, with bolts.SOLUTION: A blockage tool of the present invention is a blockage tool for covering the side surfaces of a bolt with a polygonal head. The blockage tool of the present invention comprises: a washer part, which is a circular plate with a first hole; a protective part, which is a circular plate with a second hole; and a compression section, which is an elastic material with a third hole. The diameter of the first hole is larger than the diameter of the screw part of the bolt and smaller than the maximum diameter of the bolt's head. The diameter of the second hole is larger than the maximum diameter of the bolt's head. The diameter of the third hole is equal to or smaller than the diameter of the second hole. The compression section is sandwiched between the washer part and the protective part, such that at least the center of the second hole and the center of the third hole align. The sum of the thickness of the protective part's plate and the thickness of the elastic material in its uncompressed state is equal to the length of the bolt's head.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a sealing device for closing the gap around the head of a bolt. [Background technology]

[0002] Patent Document 1 shows a cap for closing the hole in the head of a bolt. Patent Document 2 shows a technique for covering the head of a bolt inserted into a hole in a concrete structure such as a sediment control dam or bridge pier with a rubber material. Patent Documents 3 and 4 show techniques for promoting the creation of cities without utility poles (undergrounding projects). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2010-175068 [Patent Document 2] Japanese Patent Publication No. 2010-024676 [Patent Document 3] Japanese Patent Publication No. 2008-109791 [Patent Document 4] Japanese Patent Publication No. 2010-200489 [Overview of the project] [Problems that the invention aims to solve]

[0004] The undergrounding of utility poles is one of the country's important policies and is being promoted under the supervision of the Ministry of Land, Infrastructure, Transport and Tourism. However, the current undergrounding project uses a method of wiring cables in underground conduits, which is enormously more expensive to construct than wiring using utility poles. Therefore, we are considering reducing construction costs by changing the underground conduits to a small box system, which consists of a gutter covered with a lid. Figure 1 shows the wiring system in the case of the small box system. In Figure 1, the sidewalk 810 and the roadway 830 are separated by a curb 840. However, they may be separated by other facilities such as guardrails. Also, the sidewalk is adjacent to private land 820. In Figure 1, a gutter 210 is formed in part of the sidewalk 810, and a lid 220 is placed on top of the gutter 210. The gutter 210 and the lid 220 constitute a small box 200. For example, a communication cable 910 and a power cable 920 are housed inside the gutter 210.

[0005] Figure 2 is a cross-sectional view illustrating the structure for fixing the cover 220 to the gutter 210, and Figure 3 is a cross-sectional view showing the cover 220 fixed to the gutter 210. The cover 220 has a bolt head hole 225 and a bolt cylindrical hole 226. The gutter 210 has an insert nut 215. As shown in Figure 3, the cover 220 is fixed to the gutter 210 by placing a washer 350, inserting the bolt 300 through the bolt head hole 225, and tightening it into the insert nut 215. The bolt 300 consists of a head 310, a cylindrical part 320, and a threaded part 330.

[0006] The bolt head hole 225 is formed to prevent the head 310 of the bolt 300 from protruding from the cover 220, and its depth is approximately the same as the sum of the length of the head 310 and the thickness of the washer. A hexagonal bolt or the like is used for the bolt 300. In this configuration, the outside of the head 310 is inserted into an impact wrench or the like to rotate the bolt 300, so a gap 390 exists between the bolt head hole 225 and the head 310. Mud, sand, dust, etc. can accumulate in the gap 390, so it is necessary to seal the gap 390.

[0007] The cap in Patent Document 1 is a cover for blocking the wrench insertion hole of a bolt with a hole, but it may come off. The rubber member in Patent Document 2 is used when fixing a rubber protective plate body to a concrete structure, and it covers the entire head of the bolt to protect the structure from impacts by rocks and driftwood. The rubber member in Patent Document 2 is a member for protecting the structure from impacts by rocks and driftwood, and is not a member used to seal the gap 390. The present invention aims to provide a sealing device for sealing the gap necessary when fixing a cover, such as one installed on a road, with bolts. [Means for solving the problem]

[0008] The fastener of the present invention is a fastener for covering the side surface of the head of a bolt whose head surface is polygonal. The fastener of the present invention has a washer portion which is a circular plate having a first hole, a protective portion which is a circular plate having a second hole, and a compression portion which is a circular elastic material having a third hole. The diameter of the first hole is larger than the diameter of the threaded portion of the bolt and smaller than the maximum diameter of the bolt head. The diameter of the second hole is larger than the maximum diameter of the bolt head. The diameter of the third hole is less than or equal to the diameter of the second hole. The compression portion is sandwiched between the washer portion and the protective portion such that at least the centers of the second hole and the third hole coincide. The sum of the thickness of the protective portion plate and the thickness of the elastic material in the compression portion when no force is applied is the same as the length of the bolt head. [Effects of the Invention]

[0009] The sealing device of the present invention has a compression part made of elastic material, and the diameter of the second hole is larger than the maximum diameter of the bolt head. Therefore, if the protective part is pressed towards the washer part with a wrench or the like, the protective part moves closer to the washer part, and a part of the bolt head can be inserted into the wrench. The diameter of the first hole is larger than the diameter of the threaded part of the bolt and smaller than the maximum diameter of the bolt head, so the sealing device will not come off when the bolt is tightened into the gutter. Also, the diameter of the third hole is less than or equal to the diameter of the second hole, so the gap between the bolt head and the sealing device can be reduced. Therefore, the sealing device of the present invention can seal the gaps necessary when fixing a cover, such as one installed on a road, with bolts. [Brief explanation of the drawing]

[0010] [Figure 1] A diagram showing the wiring system in the case of the small box method. [Figure 2] A cross-sectional view explaining the structure for fixing the lid 220 to the gutter 210. [Figure 3] A cross-sectional view showing the state where the lid 220 is fixed to the gutter 210. [Figure 4] A cross-sectional view showing the state where the lid 220 is fixed to the gutter 210 using the plug 100. [Figure 5] A cross-sectional view of only the plug 100. [Figure 6] A plan view of the plug 100 as seen from the protection part side. [Figure 7] A perspective view of the plug 100. [Figure 8] A cross-sectional view showing the state when the protection part 120 is pressed against the washer part 110 side with the wrench 400.

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described in detail. Components having the same function are given the same numbers, and redundant explanations are omitted.

Example

[0012] FIG. 4 is a cross-sectional view showing the state where the lid 220 is fixed to the gutter 210 using the plug 100. FIG. 5 is a cross-sectional view of only the plug 100. FIG. 6 is a plan view of the plug 100 as seen from the protection part side, and FIG. 7 is a perspective view of the plug 100. FIG. 8 is a cross-sectional view showing the state when the protection part 120 is pressed against the washer part 110 side with the wrench 400. In FIG. 6, the head 310 of the bolt 300 is also shown by a dotted line.

[0013] The fastener 100 is a fastener for covering the side of the head 310 of a bolt 300 whose head side is polygonal. The fastener 100 has a washer portion 110 which is a circular plate having a first hole 111, a protective portion 120 which is a circular plate having a second hole 121, and a compression portion 130 which is a circular elastic material having a third hole 131. The washer portion 110 and the protective portion 120 may be made of metal material similar to that used for ordinary washers. A sponge-like elastic material is preferred as the elastic material. If it is sponge-like, it will shrink as the hollow space inside the elastic material becomes smaller. Therefore, even if the shape of the compression portion 130 is made to fill the gap 390 as much as possible, it will be easy to compress by pressing with a wrench or the like. For the sponge-like elastic material, for example, chloroprene sponge rubber may be used, but other materials may also be used. The hollow space in the sponge-like elastic material should be small enough to prevent mud, sand, and dust from entering. However, if it is made of sponge-like material, even if mud, sand, and dust get into the hollow space near the outside, it is less likely for mud, sand, and dust to get into the hollow space in the center.

[0014] The diameter D1 of the first hole 111 is equal to the diameter D of the threaded portion 330 of the bolt 300. N and the diameter D of the cylindrical portion 320 of the bolt 300 E Larger, the minimum diameter D of the bolt head 310 for bolt 300 MIN It should be made smaller. However, at least the diameter D1 of the first hole 111 must be the maximum diameter D of the head 310 of the bolt 300. MAX If it is smaller, the bolt 300 can be tightened into the gutter 210 to prevent the blockage device 100 from coming off.

[0015] The diameter D2 of the second hole 121 is equal to the maximum diameter D of the head 310 of the bolt 300. MAX It is larger. Therefore, the protective part 120 fits into the gap 390 when pressed. The diameter D3 of the third hole 131 is less than or equal to the diameter D2 of the second hole 121. Here, "less than or equal to" also includes "approximately the same". In other words, the diameter D3 of the third hole 131 may be approximately the same as the diameter D2 of the second hole 121, or it may be smaller than the diameter D2 of the second hole 121. Also, the diameter D3 of the third hole 131 should be as close as possible to the minimum diameter D of the head 310.MIN If the diameter is close to this, it becomes easier to fill the gap 390. Therefore, the diameter D3 of the third hole 131 should be less than or equal to the maximum diameter D of the head 310. MAX The compression part 130 is sandwiched between the washer part 110 and the protection part 120 so that at least the centers of the second hole 121 and the third hole 131 coincide when viewed from the protection part side. The compression part 130, the washer part 110, and the protection part 120 may be adhered using an adhesive material such as double-sided tape. Also, the outer diameter D of the plate of the protection part 120 OUT and the outer diameter D of the elastic material in the state where no force is applied to the compression part 130 OUT may be the same. This is because the gap 390 can be filled. Although the necessity is low when only considering the purpose of filling the gap 390, the outer diameter of the plate of the washer part 110 may also be D OUT as well. Also, as shown in FIG. 6, the center of the first hole 111 may also coincide with the centers of the second hole 121 and the third hole 131 when viewed from the protection part side.

[0016] The thickness T of the plate of the protection part 120 120 and the thickness T of the elastic material in the state where no force is applied to the compression part 130 130 The sum of these is the same as the length L of the head 310 of the bolt 300 310 Also, the depth D of the bolt head hole 225 <( 225 should be the same as the sum of the length L of the head 310 of the bolt 300 310 and the thickness T110 of the washer part 110. With such dimensions, the surface of the lid 220, the upper surface of the head 310 of the bolt 300, and the upper surface of the protection part 120 can be made to coincide, making it easier for pedestrians to walk. [[ID=I25]]

[0017] According to the plug 100, there is a compression part 130 which is an elastic material, and the diameter of the second hole 121 is the maximum diameter D of the head 310 of the bolt 300 MAXIt is larger. Therefore, as shown in Figure 8, if the protective part 120 is pressed against the washer part 110 side with a wrench 400 or the like, the protective part 120 will move closer to the washer part 110 side, and a part of the head 310 of the bolt 300 can be inserted into the wrench 400. Therefore, the bolt 300 can be rotated with a wrench 400 or the like, so it is possible to tighten or loosen the bolt 300. Also, the diameter of the first hole 111 is larger than the diameter of the threaded part 330 of the bolt 300, and the maximum diameter D of the head 310 of the bolt 300 is larger. MAX Because it is smaller, the blockage device 100 will not come off once the bolt 300 is tightened into the gutter 210. Also, since the diameter of the third hole 131 is less than or equal to the diameter of the second hole 121, the gap between the head 310 of the bolt 300 and the blockage device 100 can be reduced. Therefore, the blockage device 100 can close the gap 390 required when fixing a cover 220, such as one installed on a road, with a bolt 300. [Explanation of Symbols]

[0018] 100 Blocking device 110 Washer part 111 First hole 120 Protective part 121 Second hole 130 Compression section 131 Third hole 200 Small box 210 Gutter 215 Insert nut 220 Lid 225 Bolt head hole 226 Bolt cylindrical hole 300 Bolt 310 Head 320 Cylindrical part 330 Screw part 350 Washer 390 gap 400 wrench

Claims

1. A fastening device for covering the side of the head of a bolt whose head has a polygonal side, A washer portion which is a circular plate having a first hole, A protective part which is a circular plate having a second hole, A compression section which is a circular elastic material having a third hole, It has, The diameter of the first hole is larger than the diameter of the threaded portion of the bolt and smaller than the maximum diameter of the head of the bolt. The diameter of the second hole is greater than the maximum diameter of the bolt head. The diameter of the third hole is less than or equal to the diameter of the second hole. The compression portion is sandwiched between the washer portion and the protective portion such that at least the center of the second hole and the center of the third hole coincide. The sum of the thickness of the protective plate and the thickness of the elastic material when no force is applied to the compression part is the same as the length of the bolt head. A occluding device characterized by the following features.

2. The occluding device according to claim 1, The elastic material is sponge-like. A occluding device characterized by the following features.

3. The occluding device according to claim 1, The elastic material is chloroprene sponge rubber. A occluding device characterized by the following features.

4. A closure device according to claim 2 or 3, The outer diameter of the protective plate is the same as the outer diameter of the elastic material when no force is applied to the compression section. A occluding device characterized by the following features.

5. A closure device according to claim 2 or 3, The outer diameter of the plate in the protective part and the outer diameter of the elastic material in the compression part when no force is applied are the same. The diameter of the third hole is smaller than the maximum diameter of the bolt head. A occluding device characterized by the following features.

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