JP4381244B2 - I / O line structure of box - Google Patents

Description

  The present invention relates to a box input / output line structure for inserting an electric wire, an optical fiber cable, or the like.

A box that houses an electric device, an electronic device, or a communication device is provided with an input / output line portion through which a cable such as an electric wire or an optical fiber cable is inserted. Such a cable input / output part of the box body has been processed with sheet metal in the past, and the workability is poor, and if the chips enter the box body, there is a risk of causing a short circuit accident in the charging part. It was. In addition, post-processing such as sealing is performed after the cable is inserted so that small animals such as water drops and insects do not enter after installation.
On the other hand, in order to eliminate the need for such post-processing, for example, a technique disclosed in Patent Document 1 or Patent Document 2 has been proposed. In Patent Document 1, the opening of the box is blocked. A rubber plate is affixed to each other, and a cross-shaped slit is formed only in a portion through which the electric wire is inserted so that the electric wire is inserted so that no gap is generated. Moreover, in patent document 2, the packing with a slit is fitted to a notch, and the input / output part of a cable is formed.
Japanese Utility Model Publication No. 62-81409 JP 2004-15947 A

However, the technique of Patent Document 1 requires on-site slit formation processing, and the wire insertion portion formed by the slit cannot be completely closed, and a water droplet or the like enters the box from the gap. There was a thing.
Moreover, although the technique of patent document 2 does not require the hole drilling etc. on the spot, since the cable is still inserted from the slit, generation | occurrence | production of the clearance gap was not prevented.
Therefore, in view of such problems, an object of the present invention is to provide a box input / output line structure in which water drops, insects, and the like do not enter without requiring on-site processing and post-processing. .

In order to solve the above-mentioned problems, the invention described in claim 1 has a water-absorbing property in a waterproof sheet that has waterproofness and stretchability and has a plurality of holes for entering and exiting cables such as electric wires. And a composite sheet obtained by superimposing water-absorbing sheets having slits formed at the same positions as the holes is disposed so that the water-absorbing sheet faces outward and covers the input / output line opening of the box. To do.
With this configuration, in the state where the cable is not inserted, the hole processed portion is kept airtight by the water absorbent sheet that only forms the slit, and even if the cable is inserted through the hole, it can be inserted through the hole through the slit. Airtightness can be maintained in the cable insertion part. Therefore, it is possible to drill holes in advance, and there is no need to drill holes at the construction site. In addition, it is possible to prevent insects and the like from entering the box without performing a sealing process after the cable is inserted, and water droplets can be reliably absorbed by the water absorbing sheet before entering the box.

The invention of claim 2 is characterized in that, in the invention of claim 1, the plurality of holes drilled in the waterproof sheet are constituted by a plurality of types of large holes.
With this configuration, it is possible to select a hole according to the diameter of the cable to be inserted, and if a hole with a diameter slightly smaller than the diameter of the cable is selected, the waterproof sheet will adhere to the cable due to the stretchability of the waterproof sheet, and the thickness of the cable Regardless of, good airtightness can be obtained.

A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the slits of the water absorbent sheet are formed to cross at least in a cross shape.
With this configuration, when the cable is inserted into the hole, the tip of the slit processing portion of the water absorbent sheet easily enters between the hole and the cable, and when a gap is generated between the hole and the cable, it is preferable to enter the gap. The gap can be closed.

According to the present invention, in the state where the cable is not inserted, the hole processing portion is kept airtight by the water absorbing sheet, and even if the cable is inserted into the hole, the hole processing portion is inserted into the hole through the slit to the cable insertion portion. Airtightness can be maintained. Therefore, it is possible to drill holes in advance, and there is no need to drill holes at the construction site. In addition, insects and the like can be prevented from entering the box without post-processing such as sealing after the cable is inserted, and water droplets can be reliably absorbed by the water absorbing sheet before entering the box.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a main part of a box showing a structure of an input / output line part of the box according to the present invention. 1 is a box body, 2 is a waterproof sheet, 3 is a water absorbent sheet, 4 is a sheet of the box body 1 A fixing frame for mounting and fixing to the opening 1a is shown.

  The waterproof sheet 2 is formed by processing a waterproof and stretchable rubber sheet, for example, and has a rectangular shape that matches the shape of the opening 1 a of the box body 1. Two relatively large circular holes 6 (6a) are formed in the center, and a plurality of small circular holes 6 (6b) are formed in a lattice shape on the left and right sides in the longitudinal direction of the sheet. Types of holes 6 are formed.

  The water-absorbent sheet 3 is formed of a material excellent in water absorption and absorbable moisture that easily evaporates, and is processed into the same shape as the waterproof sheet 2. A plurality of cross-shaped slits 7 (7 a, 7 b) are cut into the holes 6 formed in the waterproof sheet 2. As a material having good water absorption and transpiration, for example, UNIBEX SB (registered trademark) manufactured by Unitika can be used.

The waterproof sheet 2 and the water absorbent sheet 3 formed in this way are overlapped and bonded with the water absorbent sheet 3 facing outside to form a composite sheet that covers the opening 1a of the box body 1, and the cable insertion part is a hole. 6 and the slit 7 are overlapped.
The attachment to the box body 1 is performed by sandwiching the composite sheet by a metal fixing frame 4 made in accordance with the shape of the opening 1a, the screw insertion hole 8a provided in the fixing frame 4, and this screw. A screw (not shown) is inserted into a screw insertion hole 8b formed in the composite sheet so as to fit the insertion hole 8a, and is fixed to the box body 1 by being screwed.

FIG. 2 shows a state in which the cable is inserted into the cable insertion portion of the composite sheet, that is, a state in which the cable is inserted into the hole 6 of the waterproof sheet 2 through the slit 7 of the water absorbent sheet 3. Shows the water droplets traveling up.
The insertion operation of the cable 9 is performed by selecting the hole 6 having a diameter slightly smaller than the diameter of the cable 9. By doing so, the hole 6 of the waterproof sheet 2 is expanded in diameter and is in close contact with the periphery of the cable 9, so that no gap is generated in the cable insertion portion as shown in FIG. However, if there is no such hole, a hole 6 that is the same as or slightly larger than the cable diameter may be selected. In this case, when the cable 9 is inserted, the end of the slit 7 processed portion of the water absorbent sheet 3 enters the gap between the hole 6 and the cable 9, thereby closing the gap.
The relatively large hole 6a can also be used when a plurality of cables are inserted together in addition to inserting a thick cable.

In this way, when the cable is not inserted, the hole processed portion is closed by the water absorbent sheet that has been slit, so that airtightness is maintained, and even if the cable is inserted through the hole, the hole is passed through the slit. By inserting the cable into the cable, the cable insertion part can maintain airtightness. Therefore, insects and the like can be prevented from entering the box without performing post-processing such as sealing after insertion, and the water absorbing sheet absorbs the water droplets transmitted from the cable, so that the water droplets enter the box. There is nothing. Moreover, it is not necessary to drill holes at the construction site.
Furthermore, when the slit is provided in a cross shape, when the cable is inserted into the hole, the slit processed part tip of the water absorbent sheet easily enters between the hole and the cable, and even when a gap is likely to occur between the hole and the cable, The gap can be satisfactorily closed.

  FIG. 3 shows another shape of the hole 6 formed in the waterproof sheet 2. If a long hole as shown in FIG. 3 (a) or an elliptical shape as shown in FIG. 3 (b) is used, an electric wire having an oval cross section like a VVF cable can be satisfactorily generated without a gap. Can be inserted. In addition, if a substantially triangular shape is used as shown in FIG. 3C, a gap is not generated when a cable consisting of three cables such as a CV-T cable is inserted.

In the above embodiment, the size of the hole 6 provided in the waterproof sheet 2 is two types. However, a plurality of types of holes may be provided, and the best hole depending on the diameter of the cable to be inserted. It becomes easy to select. Moreover, the material of the waterproof sheet 2 may not be a rubber sheet, and a vinyl sheet can be used as long as the sheet has waterproofness and flexibility.
Furthermore, the material of the water absorbing sheet 2 can be used as long as it has at least excellent water absorption, and a nonwoven fabric made of synthetic resin fibers can also be used.
Moreover, the slit 7 provided in the water absorbing sheet 3 may not be a cross, and may be formed by increasing the number of slits to be crossed and crossing, for example, four slits. By increasing the number of crossing slits, when a plurality of cables 9 are inserted through one hole 6, the gap can be satisfactorily closed.

It is a disassembled perspective view of the box main part which shows an example of the embodiment of the input / output line part structure of the box concerning the present invention. It is explanatory drawing of the state which inserted the electric wire in the hole. It is a figure which shows the other shape of the hole provided in the waterproof sheet.

Explanation of symbols

  1 .... Box body, 2 .... Waterproof sheet, 3 .... Water absorbing sheet, 6 .... Hole, 7 .... Slit, 9 .... Cable.

Claims (3)

A water-absorbing sheet with water absorption and a slit formed at the same position as the hole is superposed on a waterproof sheet that is waterproof and stretchable and has a plurality of holes for entering and exiting cables such as electric wires. A box input / output line structure characterized in that the composite sheet is disposed so as to cover the input / output line opening of the box with the water absorbent sheet facing outside. The box input / output line structure according to claim 1, wherein the plurality of holes formed in the waterproof sheet are formed of a plurality of types of holes. The box structure according to claim 1 or 2, wherein the slits of the water absorbent sheet are formed to cross at least in a cross shape.

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