JP4845044B2 - Drainage hole exterior - Google Patents

Description

  The present invention relates to a drainage hole exterior tool that is sheathed in a drainage hole on the bottom surface of a box, and more particularly to a drainage hole exterior tool that extends a drainage hole to prevent undesired entry from the drainage hole.

  In railways, a traffic signal is installed on the side of a track and remotely controlled, so a connection box that relays a signal transmission cable is attached to the traffic signal (see, for example, Patent Document 1). In addition, some railway equipment (signals, railroad crossing alarms / breakers, electrical switchboards, track circuits) are equipped with an intelligent terminal for railway signal security devices and communicated therewith (for example, Patent Document 2). Such terminal casings, connection boxes as described above, and instrument boxes for intermediate network signals are installed outdoors, so that the built-in electrical components are not drip-proof so that they do not get wet. ing. In addition, a drain hole is formed in the bottom of the box so that the water will fall out when water comes out of the box due to condensation, etc., and splashes etc. may enter undesirably from the drain hole. In order to prevent this, a drain hole exterior tool is mounted outside the drain hole and the drain hole is extended.

FIG. 2 shows a conventional example of such a box 10 and a drain hole exterior tool 20, (a) is a perspective view of the bottom surface of the box 10, and (b) is a detailed sectional view of the drain hole exterior tool 20.
The box 10 has a lid 12 that can be opened and closed for maintenance of a built-in product, and a drain hole 13 having a diameter of about 5 mm is formed through the bottom surface 11 of the main body.
A cylindrical member is frequently used for the drain hole exterior tool 20, and its hollow 21 is adapted to the drain hole 13 in order to allow the water W to escape and has a diameter of about 5 mm and a length of about 10 mm.
In addition, instead of the drainage hole exterior tool 20, a commercially available drainage plug may be attached to the outside of the drainage hole 13. The drain plug has a meandering hollow.

Japanese Unexamined Patent Publication No. 2000-052988 (FIG. 6) Japanese Patent Laying-Open No. 2003-237579 (FIG. 1)

As described above, in the conventional drainage hole exterior tool, the drainage hole is provided to discharge water from the inside of the box to the outside of the box, while the drainage hole is extended outwardly by the drainage hole exterior tool, that is, downward in the installed state. The water is prevented from entering the box from outside the box.
However, in such a conventional drain hole exterior device, it is not possible to prevent dust from entering even if water such as splashes can be prevented. Dust is so fine and soars in the wind that it will slip through the passage and enter the box, regardless of whether the drain hole and the drain passage for drainage extending from it are straight or winding. For this reason, the drainage which drains water and the dust prevention which prevents invasion of dust were not compatible.

However, if dust accumulates in the box, there is a concern that undesirable phenomena such as insulation deterioration may occur. Therefore, a dust removal filter with a dustproof function or a metal powder sintered filter should be incorporated in the drainage hole exterior device. However, since such a filter is too fine, the simple drainage function using the dripping of water by its own weight is impaired.
Therefore, in order to provide a dustproof function without impairing the drainage function, it is a technical problem to devise the structure of the drainage hole exterior device.

  The drainage hole exterior device of the present invention (Solution 1) was created in order to solve such a problem, and is attached to the outside of the drainage hole formed on the bottom surface of a box installed outdoors. The drainage hole exterior device is characterized in that a large number of granules are filled in a hollow that allows the drainage hole to communicate with the outside.

  Moreover, the drainage hole exterior tool of the present invention (Solution means 2) is the drainage hole exterior tool of the above solution means 1, wherein the particles are spherical.

  Furthermore, the drainage hole exterior tool of the present invention (Solution means 3) is the drainage hole exterior tool of the above solution means 2, characterized in that the diameter of the sphere is 4 mm or more and 5 mm or less.

  Moreover, the drainage hole exterior tool of the present invention is (Solution means 4), the drainage hole exterior tool of the above solution means 1 to 3, wherein the filling portion of the granule in the hollow has a cross-sectional area from the drainage hole. It is characterized by a wide expanded hollow.

  Moreover, the drainage hole exterior tool of the present invention is (the solution means 5), the drainage hole exterior tool of the solution means 4, and an internal fitting cylinder that directly extends the drainage hole, and is fitted on the outside. An outer fitting member is provided, and the enlarged hollow is formed in a portion of the outer fitting member that surrounds a tip of the inner fitting cylindrical body.

In such a drainage hole exterior device of the present invention (Solution 1), a large number of granules are filled in the hollow that allows the drainage hole and the outside to communicate with each other. The dust that naturally falls in still air cannot pass through the hollow space because it is widely dispersed by being replaced by the body gap. Of course, unwanted entry of splashes and the like is also effectively prevented. Moreover, since the particles are larger than the powder, the drainage function for dropping water by its own weight is maintained even in the gaps between the particles.
Therefore, according to the present invention, it is possible to realize a drainage hole exterior device having both a drainage function and a dustproof function.

Further, in the drainage hole exterior tool of the present invention (Solution 2), since a sphere is adopted as the granule, even if the granule is packed into a hollow space, it is filled in an orderly manner. In addition, the inter-granular gaps are aligned and the dustproof function is highly stable.
Therefore, according to the present invention, it is possible to easily realize a drainage hole exterior device having a high dustproof function in addition to a drainage function.

Furthermore, in the drainage hole exterior device of the present invention (Solution means 3), the spherical body diameter is limited to 4 mm to 5 mm, so that a spherical body made of a general material apart from a material having strong water repellency is powdered. Therefore, it is easy to procure the powder and an increase in cost is avoided.
Therefore, according to the present invention, it is possible to easily and inexpensively realize a drainage hole exterior device having a high dustproof function in addition to a drainage function.

Further, in the drainage hole exterior device of the present invention (Solution means 4), since the filling portion of the granules in the hollow is an expanded hollow having a wider cross-sectional area than the drainage hole , a large number of granules in the hollow Even if it is filled, a sufficient quantity of granule gaps is secured, so that the drainage function is maintained at a high level.
Therefore, according to the present invention, it is possible to realize a drainage hole exterior device to which a dustproof function is added without impairing the drainage function at all.

Further, in the drainage hole exterior device of the present invention (solution 5), an inner fitting cylinder that directly extends the drainage hole and an outer fitting member that is fitted on the inside are provided. Among them, the existing cylindrical tubular drainage hole exterior tool may be used as it is, and even when newly provided, it can be sheathed at the drainage hole in the same manner as existing products. And if the outer fitting member filled with the granule is fitted to the inner fitting cylindrical body and then fixed, the mounting of the drainage hole exterior device is completed.
Therefore, according to the present invention, it is possible to realize the drainage hole exterior device to which the dustproof function is added without impairing the drainage function at all in an easily mounted manner.

About the drain hole exterior tool of such this invention, the specific form for implementing this is demonstrated by the following Example 1. FIG.
The embodiment 1 shown in FIG. 1 embodies all the above-described solving means 1 to 5 (claims 1 to 5 at the beginning of the application).
In addition, since the same code | symbol was attached | subjected and shown to the component similar to the past at the time of the illustration, the overlapping repeated description is abbreviate | omitted and it demonstrates below centering on difference with the former.

  About the Example 1 of the drain hole exterior tool of this invention, the specific structure is demonstrated referring drawings. 1A is a perspective view of the bottom surface 11 of the box 10, and FIG. 1B is a detailed cross-sectional view of the drainage hole exterior tool 30.

  Since this drain hole exterior tool 30 is mounted outside the drain hole 13 formed on the bottom surface 11 of the box 10 described above, an internally fitted cylinder 31 that directly extends the drain hole 13. And an external fitting member 33 that is externally fitted to the internal fitting cylindrical body 31, a large number of granules 36 that are filled in the enlarged hollow 34 formed in the external fitting member 33, and the granular bodies 36 of the internal fitting cylindrical body 31. If it is necessary to prevent entry into the hollow, a partition 32 arranged at the front end surface of the inner fitting cylinder 31 is provided to partition the hollow of the inner fitting cylinder 31 and the enlarged hollow 34 of the outer fitting member 33. It has.

The inner fitting cylinder 31 may be the same cylindrical member as the drainage hole exterior device 20 described above, or may have a diameter increased to improve air permeability, and has a length within a range in which the outer fitting member 33 can be attached. It may be a shortened one, and is attached to the drain hole 13 on the bottom surface 11 of the box 10 in the same manner as the drain hole exterior tool 20.
The partition 32 is easy to use a mesh or a grid having a coarse mesh so as not to impair the drainage function of dropping water by its own weight, but may be other members as long as it can perform the drainage function without passing the particles 36.

The outer fitting member 33 is formed so that the hollow of the inner fitting cylindrical body 31 that extends the drain hole 13 of the box 10 extends further outward and communicates with the outside. The mounting can be performed by press fitting to the inner fitting cylinder 31, screwing to the inner fitting cylinder 31 and / or the bottom surface 11 of the box 10, or the like.
Of the hollow of the external fitting member 33, the portion near the bottom surface 11 of the box 10 is externally fitted to the internal fitting cylindrical body 31, so that it has a hollow inside diameter corresponding to the external diameter of the internal fitting cylindrical body 31. The hollow portion located at the tip of the inner fitting cylinder 31 when it is externally fitted to the inner fitting cylinder 31 is expanded to a diameter of about 25 mm, for example, and becomes an enlarged hollow 34 surrounding the tip of the inner fitting cylinder 31. The cross-sectional area of the enlarged hollow 34 is wider than the cross-sectional area of the drain hole 13. Further, the outermost portion of the hollow of the outer fitting member 33 is a round hole group, a long hole, a slit, or the like having a diameter, a short diameter, and a width of about 2 to 3 mm.

  The particles 36 are spheres having a diameter of 4 mm to 5 mm and are used in large numbers, but an inexpensive one having a low sphericity is sufficient. If the material is not highly water-repellent / hydrophobic, special additional processing such as hydrophilic strengthening is not necessary. Glass such as soda glass, plastic such as ABS resin, stainless steel such as SUS404, etc. An inexpensive one can be used. The sphere diameter that allows water to fall from the sphere gap by weight varies depending on the material, but most materials seem to be usable within the sphere diameter range of 4 mm to 5 mm. A large number of such particles 36 are packed in the enlarged hollow 34 in a dense state, and further in a state of being overlapped in two or more layers.

  In use, the drainage hole exterior tool 30 having such a structure is provided outside the drainage hole 13 formed on the bottom surface 11 of the aforementioned box 10 installed outdoors, like the drainage hole exterior tool 20 described above. Installed. If the mounting target box 10 is newly manufactured, all the drainage hole exterior tool 30 is manufactured and mounted on the box 10, but the mounting target box 10 has already been installed in the field, If the drainage hole exterior tool 20 is attached to the drainage hole exterior tool 20, the drainage hole exterior tool 20 is used as it is as the internal fitting cylinder 31 of the drainage hole exterior tool 30, and an external fitting member 33 that can be fitted to the drainage hole exterior tool 20. Since the drainage hole exterior tool 30 is created on site, it is not necessary to remove the drainage hole exterior tool 20 and the functions of the box 10 and the storage member need not be stopped at all.

  Whether it is a new production or a modification of an existing product, the assembly of the drainage hole exterior tool 30 is performed in advance on the outer fitting member 33 except for the inner fitting cylinder 31, and the inner fitting cylinder 31 at the time of mounting on the box 10. And a final assembly for connecting the outer fitting member 33. In the pre-assembly, the expanded hollow 34 of the outer fitting member 33 is filled with a large number of particles 36 and the partition 32 is placed thereon. However, since the particles 36 are spherical, a predetermined number of particles 36 are provided. Is inserted into the enlarged hollow 34 and the outer fitting member 33 is lightly shaken, the particles 36 are arranged densely and orderly in the enlarged hollow 34. The partition 32 is easily attached by, for example, bending it a little and inserting it into the enlarged hollow 34 and then expanding it.

In final assembly and mounting, the inner fitting cylinder 31 is first attached to the drain hole 13 of the bottom surface 11 of the box 10 by screwing or the like from the outside, and then the inner fitting cylinder 31 is filled with the granules 36. This is done by externally fitting the fitting member 33 and finally fixing it with screws or the like. Since the bottom surface 11 of the box 10 faces downward, the drainage hole exterior tool 30 attached to the box 10 also faces downward, and the drainage hole 13, the hollow of the inner fitting cylindrical body 31, the enlarged hollow 34 of the outer fitting member 33, and the drain outlet 35. The drainage passage for the drainage lined up also faces downward.
Then, when water W comes out of the box 10 due to condensation or the like, the water W falls from the drain hole 13 to the hollow of the internal fitting cylinder 31, and then passes through the gap between the eyes of the partition 32 and the granules 36, Finally, the water is discharged from the drain 35.

Moreover, when splashes are applied to the bottom surface 11 of the box 10 due to a storm or the like, a part thereof may enter the drain port 35 of the drainage hole exterior tool 30, but the inside is filled with the particles 36. Since the hollow 34 is expanded, most of the droplets collide with the particles 36 and are stopped, and some of the droplets that have advanced into the particle gaps are dispersed and lose momentum. There is no risk of splashes entering the hollow or drain hole 13.
Further, when outside air is blown to the drain port 35 of the drainage hole exterior tool 30 due to strong wind or the like, the outside air quickly loses momentum in the same manner. Then air keeps almost stationary. Therefore, dust that falls naturally in a windless state cannot enter the box 10 through the drain hole 13. For dust that is so fine that it floats even in a quiet atmosphere, the amount entering the same time is considerably less than in the past.

  The drainage hole exterior device of the present invention is not limited to application to railway field equipment, but is a waterproof and drip-proof box installed outdoors, with a drainage hole formed on the bottom surface. Can be applied if present.

About Example 1 of the drain hole exterior tool of this invention, (a) is a perspective view of the bottom face of a box, (b) is a detailed sectional view of a drain hole exterior tool. About the conventional drain hole exterior tool, (a) is a perspective view of the bottom face of a box, (b) is a detailed sectional view of a drain hole exterior tool.

Explanation of symbols

10 ... Box 11, 11 ... Bottom, 12 ... Lid, 13 ... Drain hole,
20 ... drain hole exterior tool, 21 ... hollow,
30 ... Drainage hole exterior tool, 31 ... Internal fitting cylinder, 32 ... Partition,
33 ... External fitting member, 34 ... Expanded hollow, 35 ... Drain port, 36 ... Granule

Claims (1)

In the drainage hole exterior device attached to the outside of the drainage hole formed on the bottom surface of the box installed outdoors, the hollow that connects the drainage hole and the outside is filled with a large number of granules , Of the hollow, the filling portion of the granule is an enlarged hollow having a wider cross-sectional area than the drainage hole , and further includes an inner fitting cylinder that directly extends the drainage hole, and an outer fitting to the outer fitting cylinder. fitting member and is provided, the enlarged hollow is formed in a portion surrounding the distal end of the inner fitting cylindrical body of said outer fitting member, water loophole outer brace you wherein a.

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