JP2000333345A - Gap waterproof device for open end of conduit material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gap waterproof device, which watertightly blocks the gap between the inner circumferential face of a larger-diameter conduit material and the outer circumferential face of a smaller-diameter cable or the like inserted into the conduit material at an open and of the conduit material, and is capable of positioning and securing the cable or the like with reliability and further is simple in structure and easy to handle. SOLUTION: A coupling body 1 to be forcedly thrusted and inserted into a conduit material P and a waterproof packing body 10 with a cable C or the like inserted thereinto, fit into the coupling body 1 are attached between the conduit material P and the cable C or the like to be inserted into the conduit material P at an open end of the conduit material. The coupling body 1 is formed by integrally coupling together a tapered insertion portion 2, which is tapered on the open end side and has a male thread 3 formed on the outer face of a circumferential sidewall, substantially C-shape in cross section and expandable in the radial direction, and a rotational operation portion 5 having a polygonal external shape. The waterproof packing body 10 is in cylindrical shape so that the cable kind C or the like can be inserted thereinto and has an insertion slit 11 formed. The waterproof packing body is provided with a pressing portion 12 formed on its inner circumferential face and swelled out toward the center, and with a positioning projection 13 is formed on its outer circumferential face, which positioning projection is to be positioned in the cut-off portion of the coupling body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe made of polyethylene pipe for inserting and storing various cables which are exposed and wired for branching-in, amplification and the like in a wiring box called an information box, for example. The present invention relates to a gap waterproofing device at an opening end of a pipe material, in which cables having a diameter smaller than the diameter of the pipe material can be connected and inserted in a watertight manner.

[0002]

2. Description of the Related Art Recently, underground burial of overhead wiring on the ground, and further, burial of various communication cables laid along a roadside zone or the like for road traffic control or the like have been implemented. ing. Various cables for this purpose are so-called CC (Community) embedded at predetermined intervals.
・ Communication ・ Compact, Ca
ble) It is housed in a protective tube, such as a polyethylene tube, which is piped by relaying a wiring box which is an information box called a box. In other words, these various cables are stored and plumbed in a large-capacity duct pipe that is plumbed between the wiring boxes in a state of being bundled in a plural number. Are stored separately in each of the protection tubes.

[0003] However, various cables housed in these protective tubes are inserted into the duct tube or the protective tube inserted into the duct tube, and further into the side wall of the wiring box when drawn in for each customer. Since it is buried in the soil via a protective tube or the like, it must be sufficiently protected from moisture, dust and the like in the soil. Especially in the wiring box, small-diameter cables are exposed from the opening end of the large-diameter protection tube for amplification, branching, transmission wiring to the customer, etc. for transmission in the wiring box. At the exposed portion, a gap is formed between the small-diameter cables and the opening of the protection tube having a larger diameter.

[0004]

If such a gap is left as it is, moisture and the like in the wiring box infiltrate into the protective tube from the gap, and also damage the protective tube and cables. . For this purpose, various water sealing means have been conventionally used, but in order to close the gap between the members having different diameters, both are structurally complicated.
The handling and installation was troublesome and could not be easily installed on site.

In order to solve this problem, conventionally, a gap between the cable at the opening end of the protective tube and the cables is solidified by filling with a foamed synthetic resin material. The synthetic resin material is damaged, and the cables inserted inside are damaged without bending. Similarly, there are rubber and sponge sealing packing materials in the gaps, but according to this, the cables are simply inserted, so the protective tube may come off if it expands or contracts due to a temperature difference. There is. In particular, if the protective tube itself is long, the temperature difference due to the difference between summer and winter is 30c.
Since it expands and contracts by about m, blockage, waterproofing treatment, etc., in which the expansion and contraction action is sufficiently considered are required.

Accordingly, the present invention has been made in view of the above-described various existing circumstances. For example, when various kinds of cables are pulled in and branched from a wiring box, the cables are inserted and connected to the wiring box. In the protective tube that protects the cables and accommodates the wires, the inside of the opening terminal of the large-diameter synthetic resin protective tube, which is a part where various cables to be exposed are pulled out or inserted in the wiring box, In addition, the gap with the outer periphery of the small diameter cables is closed in a water-tight manner, and even if the protective tube expands and contracts due to a temperature difference or the like, the cables can be firmly positioned and fixed, and are structurally simple and easy to handle. An object of the present invention is to provide a gap waterproof device at an opening end of a pipe material.

[0007]

In order to solve the above-mentioned problems, according to the present invention, the opening end side is tapered,
A rotating operation part 5 having a polygonal outer shape is integrated with a tapered insertion part 2 which is formed by cutting out a part of a peripheral side wall having an external thread 3 formed on an outer peripheral surface to form a substantially C-shaped cross section so as to be expandable and contractible in a radial direction. And a cable C inserted into the pipe member (P) and inserted into the opening end of the pipe member (P).
A waterproof packing body 10 fitted and disposed in the tapered insertion portion 2 of the connecting body 1 in a state of being closely attached to the periphery. The outer diameter of the tapered insertion portion 2 of the connecting body 1 is
The tapered insertion part can be made to have a tapered shape by making the base end part side that is the side larger and gradually becoming smaller as it reaches the open end part. It can be smaller than the diameter. On the inner peripheral edge of each of the open end portion and the base end portion of the tapered insertion portion 2, positioning projections 4 located on the front and rear side surfaces of the waterproof packing material 10 can be formed in a projecting manner. On the inner peripheral edge of the waterproof packing material 10, a positioning projection 4 located on the front side surface of the waterproof packing material 10 is formed in a projecting manner. The character-shaped stopper 20 can be fitted. The waterproof packing body 10 has a cylindrical shape having an inner diameter that is not larger than the outer diameter of the cables C and an outer diameter that is not smaller than the inner diameter of the tapered insertion portion 2 of the connecting body 1. Can be formed in a cut shape. In addition, the inner peripheral surface has a pressing portion 12 bulging toward the center side, and a positioning protrusion 13 located in a cutout portion of the connector 1 can be provided on the outer peripheral surface.

[0008] In the waterproof device for a gap at the opening end of the conduit material according to the present invention, the waterproof packing body 10 which is in close contact with the outer peripheral surface of the cable C by being inserted therethrough is provided. The cables C are positioned and fixed in the connector 1 by being fitted and mounted in the connector 1. In this state, by forcibly screwing the connector 1 into the opening end of the pipe material (P), the connector 1 constricted inward by the pipe material (P) removes the waterproof packing body 10. The compressed and compressed waterproof packing body 10 closes the gap between the small-diameter cables C and the large-diameter conduit member (P) in a watertight manner, and allows the cables C to be inserted and held. After the tapered insertion portion 2 of the coupling body 1 is inserted into the pipe material (P), the pipe material (P) is rotated by the rotation operation of the rotation operation section 5 after being inserted into the pipe material (P).
As the peripheral side wall expands and contracts in the radial direction, it is constricted by the pipe material (P) itself, which compresses the waterproof packing body 10 and inserts it into the inside. To the outer peripheral surface of the cables C. The positioning projections 4 provided before and after the tapered insertion portion 2 of the connector 1 and the fitted stopper 20 position the waterproof packing body 10 provided in the tapered insertion portion 2 so that the waterproof packing body 10 is positioned inside the tapered insertion portion 2. Of the waterproof packing body 10 by the tapered insertion portion 2 which is reduced in size. The insertion groove 11 of the waterproof packing body 10 opens and closes the waterproof packing body 10 itself. In the opened state, the waterproof packing body 10 is directly attached to the cables C in the same manner as the connecting body 1 through the tapered insertion portion 2 having a cutout portion. . The pressing portion 12 on the inner peripheral surface of the waterproof packing body 10 ensures the close contact with the outer peripheral surface of the cables C when the waterproof packing body 10 itself is compressed, and the positioning protrusion located at the cutout portion of the tapered insertion portion 2. The portion 13 closes the gap in the cutout portion to block the inside and outside of the open end of the pipe material (P).

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a wiring box (not shown) called, for example, an information box.
This is a connecting body that is inserted and attached to an open end of a protective tube P such as a polyethylene tube that is piped between them by forcible screwing. The connecting body 1 has a tapered shape at the opening end side,
A part of the peripheral side wall is cut out to remove almost C
The substantially cylindrical tapered insertion portion 2 having a saw blade-shaped male screw 3 formed on the outer peripheral surface so as to be freely expandable and contractible in the radial direction by being formed into a letter shape, and has a polygonal outer shape. The rotary operation part 5 is integrally formed with a metal such as aluminum.

The tapered insertion portion 2 itself has a tapered shape such that its outer diameter is large at the base end portion side, which is the side of the rotary operation portion 5, and becomes gradually smaller as it reaches the open end portion. Also, the outer diameter of the opening end portion is slightly smaller than the inner diameter of the protection tube P, and the outer diameter of the base end portion is not smaller than the inner diameter of the protection tube P. When the protective tube P is forcibly screwed in, the protective tube P is firmly fitted and inserted so that the protective tube P itself can be slightly expanded. The width of the cutout portion in the tapered insertion portion 2 is not smaller than the outer diameter of the cables C to be inserted into the protective tube P, and can be directly inserted into a desired position of the cables C, mounted and positioned. I do.

The inner peripheral edge of each of the open end portion and the proximal end portion of the tapered insertion portion 2 is located on the front and rear side surfaces of a waterproof packing material 10 described later which is fitted and disposed in the connecting body 1.
A positioning projection 4 for preventing the waterproof packing body 10 from being pulled out is formed in a projecting manner inside the tapered insertion portion 2.

The male screw 3 has a tapping screw structure that, when being gradually inserted into the protective tube P from the open end side of the tapered insertion portion 2, enters while forming a female screw on the inner peripheral surface of the protective tube P. Although the thread is formed in a saw blade shape so as to facilitate the notch insertion operation, the present invention is not limited to this as long as the forcible insertion is possible.

The turning operation part 5 has a polygonal shape suitable for turning the connecting body 1 itself when the tapered insertion part 2 is screwed into the protective tube P and inserted into the protection pipe P. It is formed in a rectangular shape and can be rotated and held firmly by a suitable rotating tool such as a spanner. The rotating operation part 5 shown in the drawing is provided with the tapered insertion part 2 so that the tapered insertion part 2 can be smoothly squeezed when the tapered insertion part 2 is inserted into the protective tube P.
The notch is formed at the same position as that of the notch.

The cylindrical waterproof packing body 10 that closes and seals the gap between the protective tube P and the cables C by being in close contact with the various cables C housed in the protective tube P is connected. The body 1 is provided separately from the body 1. The waterproof packing body 10 is made of, for example, neoprene sponge material, and has an inner diameter that is not larger than the outer diameter of the cables C to be inserted and an outer diameter that is not smaller than the inner diameter of the tapered insertion portion 2 of the connecting body 1. The cable is basically formed in a cylindrical shape, and various inner diameters corresponding to the diameters of the cables C are separately prepared. In addition, the insertion groove 11 for directly fitting and inserting the cables C is provided in the waterproof packing body 1.
0 has a compression portion 12 bulging toward the center side on the inner peripheral surface so as to improve the adhesion to the outer peripheral surface of the cables C, and is located in the cutout portion of the connecting body 1. The positioning protrusion 13 is provided in a bulging shape on the outer periphery.

The insertion groove 11 opens and closes the waterproof packing body 10 along its radial direction (see FIG. 5), and saves the trouble of inserting the cables C from the opening of the internal cavity in the front and rear side surfaces of the waterproof packing body 10. Let me omit it. The position at which the insertion groove 11 is formed preferably does not coincide with the position at which the positioning projection 13 is formed as shown in the drawing in consideration of the water tightness at the time of insertion and connection of the cables C. The compression part 12 is shown in FIG.
As shown in FIG. 5, the inner cavity itself swells so as to gradually reduce the inner diameter from the opening of the inner cavity to the center thereof, and the tightness is improved by pressing against the outer peripheral surface of the cables C. Needless to say, the shape of the pressing portion 12 is not limited to the case where the center is bulged, and even if the vicinity of the opening is bulged, it may be formed in a wavy shape.

The positioning projection 13 is located within the cutout portion of the tapered insertion portion 2 in the connecting body 1 and is intended to achieve a hermetic and waterproof property at this cutout portion. And closes a gap that can be generated by a cutout portion when the tapered insertion portion 2 is inserted into the protection tube P and inserted.

A description will be given of an example of use in the embodiment configured as described above. For example, in a distribution box (not shown), various cables C branching for each customer are placed in a protective pipe P. When the wire is retracted by passing the wire through the housing, the open end portion generated around the cables C exposed at the open end of the protective tube P is closed in a watertight manner. That is, as shown in FIGS. 2 and 3, the connecting body 1 is directly expanded to a predetermined position of the cables C using the cutout portion of the tapered insertion portion 2, and the waterproof packing body 10 is expanded by the insertion split groove 11. In the same manner, the cables C are directly inserted and attached to predetermined positions of the cables C, respectively. Next, the connecting body 1 is fitted to the waterproof packing body 10, and the waterproof packing body 10 is fitted into the tapered insertion portion 2 by fitting the positioning projection 13 into the cutout portion and aligning the positions. Thereafter, the connecting body 1 is forcibly screwed into the opening end of the protection tube P by sliding along the cables C by the turning operation of the turning operation part 5 and inserted into the opening terminal of the protection tube P, and the inner periphery of the opening terminal of the protection tube P is The cables C are positioned and inserted into the protective tube P by closing a gap between the cables C and the outer periphery.

FIGS. 6 and 7 show another embodiment of the present invention, in which the inner peripheral edge of the open end portion of the tapered insertion portion 2 is positioned on the front side surface of the waterproof packing material 10. The protruding edge 4 is formed in a protruding shape, and on the inner peripheral edge of the base end portion,
The C-shaped stopper 20 which is in contact with the rear side surface of the waterproof packing material 10 is fitted. Stopper 2
0 is inserted into the tapered insertion portion 2, a groove 6 is formed in the inner peripheral surface of the tapered insertion portion 2 along the circumferential direction, and the opening end of the stopper 20 has a circular shape. Are formed to facilitate the handling of the stopper 20 itself.

In this case, as shown in the drawing, the connecting body 1 is directly connected to a predetermined position of the cables C by using the cutout portion of the tapered insertion portion 2 in the same manner as in the previous embodiment, and is waterproofed. Insert the packing body 10 into the insertion groove 1
Similarly, the stopper 20 is inserted directly into a predetermined position of the cables C by using the cutout portion, and is attached. Next, the connecting body 1 is placed in the opening end of the protective tube P, and the waterproof packing body 10 is
The waterproof packing body 10 is positioned in the tapered insertion portion 2 by inserting the stopper 20 into the inside. Thereafter, the connecting body 1 is forcibly screwed in by the turning operation of the turning operation section 5 to close the gap between the inner periphery of the opening of the protection tube P and the outer periphery of the cables C to thereby prevent the protection tube P from being closed. Position and insert cables C into P.

[0020]

Since the present invention is constructed as described above, for example, the inner periphery of the opening end of the protective tube, which is a drawer or insertion part for branching in and out of various cables in the wiring box, and the cable. The gap with the outer periphery can be closed in a watertight manner. Moreover, cables C at the opening end of the protection pipe P
Can be positioned and fixed by firmly holding the insertion state, and it is structurally simple and easy to handle.
A series of watertight processes can be performed easily and quickly. In addition, even if the protective tube P expands and contracts due to a temperature difference, even if a relative displacement with the cables C occurs at the opening end portion, the waterproof tube structure can be followed and the waterproofing structure is not damaged. At the same time, it is possible to cope with cables C having large and small diameters by replacing the waterproof packing body 10 having a different inner peripheral diameter.

That is, according to the present invention, at the opening end of the large-diameter protective tube P, which is a pipe material, a screw is inserted into the protective tube P in the gap between the small-diameter cables C inserted into the protective tube P. This is because the coupling body 1 that is forced into and contracted and the waterproof packing body 10 that is inserted into the coupling body 1 through the cables C and that is compressed are attached. Of the protective pipes P and cables C in a watertight manner, their positioning and fixing, the followability of the protective pipes P and the cables C which expand and contract due to temperature differences, and the ease of work. Is obtained.

The connecting body 1 has a tapered opening end and a part of a peripheral side wall in which a male screw 3 is formed on an outer peripheral surface thereof is cut out to have a substantially C-shaped cross section so as to be expandable and contractible in the radial direction. Since the tapered insertion section 2 is provided, the protection pipe P is rotated in the opening end of the protection pipe P by the fitting rotation operation section 5, and is screwed into the inside by the male screw 3 on the outer peripheral surface thereof.
With the screwing in, the opening end of the protection tube P is expanded, and the taper insertion portion 2 itself is narrowed by resistance from the protection tube P against the expanding force. The waterproof packing body 10 fitted and mounted in the tapered insertion part 2 can be compressed by the applied force, and the waterproof packing body 10 is securely adhered to the cables C by the pressing part 12 on the inner peripheral surface thereof.

At this time, since the connecting body 1 itself is firmly screwed into the protection pipe P and inserted, the small-diameter cables C are connected inside the large-diameter protection pipe P at the opening end of the protection pipe P. The protective tube P can be reliably inserted and held, and the inside and outside of the protective tube P are shut off in a water-tight manner and by preventing intrusion of dust and the like.

The positioning protrusion 4 provided on the front and rear of the tapered insertion portion 2 of the connecting body 1, the positioning protrusion 4 provided on the front portion, and the stopper 20 fitted on the rear portion are fitted into the tapered insertion portion 2. Waterproof packing body 10 to be placed and arranged
Can be firmly positioned to prevent the tapered insertion portion 2 from coming out. In addition, when the tapered insertion portion 2 is reduced by screwing the connecting body 1 into the protection pipe P, the reduced tapered insertion portion 2 surely compresses the waterproof packing body 10, so that the waterproof packing is provided. The sealing action of the body 10 against the cables C is ensured, and the waterproof packing body 10 does not come out of the tapered insertion portion 2 even if the cables C slide relatively with the protective tube P which expands and contracts.

The connecting body 1 has a cutout portion in the tapered insertion portion 2, and the waterproof packing body 10 has an insertion groove 11 formed therein. Since the stopper 20 has a C-shape, it is connected by the cutout portion. The body 1 and the stopper 20
In addition, the open insertion grooves 11 allow easy and quick positioning and insertion at predetermined positions of the cables C, respectively.

Since the positioning projections 4 located on the front and rear sides of the waterproof packing material 10 are formed in the inner peripheral edge of each of the opening end portion and the base end portion of the tapered insertion portion 2 in a projecting manner.
The waterproof packing body 10 arranged in the tapered insertion portion 2 can be reliably positioned and held in the tapered insertion portion 2.

Since the inner peripheral surface of the cylindrical waterproof packing body 10 has a compression portion 12 bulging toward the center, the outer periphery of the cables C when compressed by the connecting body 1 from the outside. It can be brought into close contact with the surface to improve adhesion,
Further, since the positioning projection 13 located in the notch portion of the connecting body 1 is provided on the outer periphery, the gap in the notch portion of the tapered insertion portion 2 can be closed to shut off the inside and outside of the opening end of the protection tube P.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the same use state.

FIG. 3 is a front sectional view of the same.

FIG. 4 is a side sectional view of the waterproof packing body.

FIG. 5 is a front sectional view of the waterproof packing body.

FIG. 6 is an exploded perspective view of another embodiment.

FIG. 7 is a side sectional view of the same use state.

[Explanation of symbols]

C ... Cables P ... Protective tube 1 ... Connected body 2 ... Taper insertion part 3 ... Male screw 4 ... Positioning ridge 5 ... Rotating operation part 6 ... Fit-in groove 10 ... Waterproof packing body 11 ... Insertion split groove 12 ... Compression part 13: Positioning projection 20: Stopper

Claims (8)

[Claims] 1. A tapered insertion portion having an opening end side tapered, a part of a peripheral side wall having an external thread formed on an outer peripheral surface thereof being cut out to have a substantially C-shaped cross section, and being made expandable and contractible in a radial direction. A rotating operation part having a polygonal outer shape is integrally connected and formed, and is in close contact with the connection body screwed into the opening end of the pipe material and around the cables inserted into the pipe material. And a waterproof packing body fitted and disposed in the tapered insertion portion of the connecting body. 2. The outer diameter of the tapered insertion portion of the connecting body is larger at the base end portion side, which is the rotating operation portion side, and gradually becomes smaller as it reaches the opening end portion, so that the entire tapered insertion portion is tapered. 2. The gap waterproofing device at an open end of a pipe material according to claim 1, which has a shape. 3. The gap waterproofing device at an open end of a pipe material according to claim 1, wherein the width of the cutout portion in the tapered insertion portion is not smaller than the outer diameter of the cables. 4. The tapered insertion portion according to claim 1, wherein the inner peripheral edge of each of the open end portion and the proximal end portion of the tapered insertion portion is formed with a protruding positioning edge located on the front and rear side surfaces of the waterproof packing material. A gap waterproofing device at an opening end of a pipe material according to any one of the above. 5. An inner peripheral edge of an opening end portion of the tapered insertion portion is formed with a positioning projection located at a front side surface of the waterproof packing material in a projecting manner, and an inner peripheral edge of a base end portion is provided with a waterproof packing material. The gap waterproofing device at an opening end of a pipe material according to any one of claims 1 to 3, wherein a C-shaped stopper located in contact with the rear side surface is fitted. 6. The waterproof packing body has a cylindrical shape having an inner diameter that is not larger than the outer diameter of the cables and an outer diameter that is not smaller than the inner diameter of the tapered insertion portion of the connecting body. The gap waterproofing device at an opening end of a pipe material according to any one of claims 1 to 5, wherein the device is formed in a notch shape. 7. The waterproof device for gaps at an open end of a pipe material according to claim 1, further comprising a compression portion bulging toward the center on an inner peripheral surface of the waterproof packing body. 8. The gap waterproofing device at an open end of a pipe material according to claim 1, wherein the waterproof packing body has a positioning projection located in a notch portion of the connecting body on an outer periphery.