JP2562507Y2 - Flexible tube traction tool - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction device for inserting a flexible pipe such as a bellows-shaped metal gas pipe into a buried pipe.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional traction device of this type. As shown in FIG. 3A, a wire 5 is connected to the other end of a metal rod 13 having one end thickened conically. And three vertically divided grooves 15 from the edge of the cylindrical body 14 made of a hard synthetic resin.
Which is loosely fitted around the metal rod 13. As shown in FIG. 3B, the large-diameter end of the metal rod 13 is inserted into the distal end of the flexible tube 8. By pushing the cylindrical body 14 and riding on the conical part 16 of the metal rod 13, the edge of the cylindrical body 14 is engaged with the convex ring 1 on the inner peripheral surface of the flexible tube 8, and in this state, the wire 5 By pulling the tip, the flexible tube 8 is inserted into the buried tube. The cylindrical body 14
On the inner and outer surfaces, a concave and convex pattern for preventing slippage is formed. Although the traction device configured as described above has a simple structure, the ruggedness of the tubular body 14 is easily worn away, so that the traction device may come off the flexible tube 8 during towing. Since the distance D between the distal end of the flexible tube 8 and the distal end of the traction tool is large, there is a disadvantage that the distal end of the traction tool is easily caught by the bent portion of the buried pipe.

The conventional example shown in FIG. 4 solves the above-mentioned problem. In order to eliminate slippage, a metal rod 13 is threaded and a nut 17 is screwed into the metal rod 13. And a claw portion 19 is formed on the vertically divided piece 18. In the drawing, reference numeral 20 denotes a holding ring into which the vertical split pieces 18 are loosely fitted. According to this configuration, the nut 17 prevents the vertically split piece 18 from slipping, and the claw 19 engages with the convex ring 1 on the inner peripheral surface of the flexible tube 8 as shown in FIG. On the other hand, although it has become robust, the number of parts is increased, and the use of the nut 17 necessitates the screwing of the wire connecting member 21, resulting in a disadvantage that the structure becomes complicated.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, has a simple structure, has a small number of parts, ensures that the flexible tube is securely held, and is likely to be caught by the bent portion of the buried tube. It is an object of the present invention to provide a flexible tube traction tool that does not require a flexible tube.

[0005]

As shown in FIG. 1, a flexible tube traction tool according to the present invention is formed by vertically dividing a cylindrical cup having a plurality of bellows-like convex rings 1 on an inner peripheral surface into two. Shape 2
Half cylinders 2a, 2b, and these half cylinders 2a, 2b
b, and two wires 5a, 5b each having one end connected to the bottom plate portion 4 of each of the semi-cylindrical bodies 2a, 2b are attached to the bottom plate 6 of the cylindrical cup body 3. The two semi-cylindrical bodies 2a, 2a are drawn out to the outside through the perforated hole 7.
The distal end of the flexible tube 8 is gripped between b.

[0006]

In use, as shown in FIG. 2, a coating 9 made of a heat-shrinkable synthetic resin on the distal end of a flexible tube 8 is removed.
This portion is inserted between the two semi-cylindrical bodies 2a, 2b from both sides into the cylindrical cup body 3, and the ends of the wires 5a, 5b are connected to one end of a wire previously inserted into the buried pipe 10,
By pulling the other end of the wire, the flexible tube 8 is connected to the buried tube 1.
Insert 0.

[0007]

FIG. 1 shows an embodiment of the present invention.
Each of the metal semi-cylindrical bodies 2a and 2b has a shape obtained by vertically dividing a cylindrical cup into two parts, and has a plurality of bellows-like convex ring portions 1 formed on an inner peripheral surface thereof. The inner diameter is slightly larger than the outer diameter of the semi-cylindrical bodies 2a, 2b so that the semi-cylindrical bodies 2a, 2b can be freely inserted and removed. Each bottom plate portion 4 of the semi-cylindrical bodies 2a, 2b has a through hole 12
a, 12b are drilled, and the wires 5a, 5b inserted into these through holes have metal caulking pieces 10 for securing them at the ends, and the bottom plate portions of the semi-cylindrical bodies 2a, 2b, respectively. 4 In addition, these wires 5a, 5
The other end of b is led out through a through-hole 7 formed in the bottom plate 6 of the cylindrical cup body 3. In this embodiment,
The wires 5a and 5b are one continuous wire at the other end.

FIG. 2 shows a state of use. First, a coating 9 made of a heat-shrinkable synthetic resin is removed from a tip portion of a flexible tube 8, and this portion is divided into two semi-cylindrical bodies 2a, 2a from both sides. 2b
When the two semi-cylindrical bodies 2a, 2b are inserted into the cylindrical cup body 3 as they are, the two semi-cylindrical bodies 2a, 2b are restricted by the inner periphery of the cylindrical cup body 3 and cannot be opened, and the distal end of the flexible tube 8 It is securely held between the two semi-cylindrical bodies 2a and 2b. A wire for towing is inserted into the buried pipe 10 in advance. If one end of the wire is connected to the tip of the wire 5a, 5b and the other end of the wire is towed, the flexible pipe 8 is connected to the buried pipe 10. Can be inserted. When attaching the traction device of the present invention to the flexible tube 8, it is necessary to remove the synthetic resin coating 9 at the distal end portion of the flexible tube 8, but in the case of the conventional example, the flexible tube is eventually used for gas equipment or the like. At the time of connection, it is necessary to remove the coating on the tip portion, so that extra work is not required. Further, in this embodiment, the metal caulking pieces 11 are used for connecting the wires 5a, 5b and the two semi-cylindrical bodies 2a, 2b, but the connecting method is not limited to this.

[0009]

As described above, the traction device according to the present invention is a semi-cylindrical body 2a, 2 having a shape obtained by vertically dividing a cylindrical cup into two.
b, the distal end of the flexible tube 8 is clamped, and this is
The two semi-cylindrical bodies 2a and 2b holding the flexible tube 8 are sandwiched between the inner peripheral surface of the cylindrical cup body 3 and the outer peripheral surface of the flexible tube 8. There is an advantage that the flexible tube 8 is firmly held, and the wires 5a and 5b can be directly connected to the cylindrical cup body 3, so that the distal end of the towing device and the distal end of the flexible tube are different from the conventional example. Distance D is short,
Accordingly, there is an advantage that the tip of the traction tool does not get caught on the inner surface of the buried pipe even at the bent portion of the buried pipe 10, and there is an advantage that it can be provided at a low price because the number of parts is small.

[Brief description of the drawings]

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

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

FIG. 3A is a perspective view of a conventional example. (B) is sectional drawing of the use condition same as the above.

FIG. 4A is a cross-sectional view of another conventional example. (B) is sectional drawing of the use condition same as the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Convex ring part 2a, 2b Semi-cylindrical body 3 Cylindrical cup body 4 Bottom plate part 5a, 5b Wire 6 Bottom plate 7 Through hole 8 Flexible tube 9 Coating 10 Buried tube 11 Metal caulking piece 12a, 12b Through hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A semi-cylindrical body formed by vertically dividing a cylindrical cup having a plurality of bellows-like convex rings on an inner peripheral surface into two half-cylindrical bodies, and a cylinder into which these half-cylindrical bodies are inserted so as to be freely inserted and removed. Two wires, one end of which is connected to the bottom plate of each semi-cylindrical body, are led out to the outside through through holes formed in the bottom plate of the cylindrical cup body, and are flexible between the two semi-cylindrical bodies. A flexible tube pulling device configured to grip a distal end portion of a tube.