JPH0680314U - Flexible conduit tube made of synthetic resin with electric wire - Google Patents

Abstract

(57) [Summary] [Structure] A single electric wire 3 is inserted over the entire length in a synthetic resin flexible electric wire tube 2 having an inner diameter larger than the outer diameter of the electric wire 3 (preferably 3 times or more), Caps 4 were attached to both ends of the flexible conduit tube 2 made of synthetic resin. [Effect] The electric wires can be wired at the same time when the flexible conduit tube made of synthetic resin is laid, and the wiring work can be performed efficiently. When the cap is removed, the end of the wire can be pulled out from the end of the flexible conduit tube made of synthetic resin, so the end treatment of the wire is easy. Even if the flexible conduit is broken by an anchor bolt or the like after installation, the electric wire has a margin to move and escape in the flexible conduit, so that the risk of damaging the electric wire is extremely small.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flexible conduit tube made of synthetic resin containing an electric wire used for indoor wiring in a building or the like.

[0002]

[Prior art]

 In recent years, flexible conduits made of synthetic resin have come to be used instead of metal conduits for conduits for indoor wiring in buildings and the like. Even if such a flexible conduit made of synthetic resin is used, the wiring work procedure is the same as before, and depending on the progress of the construction work, first the flexible conduit is laid on the specified route and then The method was to pull the wire into the flexible conduit at an appropriate time.

[0003]

[Problems to be Solved by the Invention]

 However, in such a wiring work method, it is necessary to separately perform the piping of the flexible conduit and the drawing of the electric wire, which is troublesome twice and the construction cost is high.

In order to solve this problem, a synthetic resin flexible electric wire tube with an electric wire in which an electric wire is drawn in advance in a synthetic resin flexible electric wire tube is manufactured in a factory, and the flexible electric wire tube is carried into a construction site, A method of conducting wiring work can be considered. In this way, since the electric wire can be laid at the same time as the flexible conduit pipe, the construction cost can be significantly reduced.

However, according to this method, if the flexible conduit tube is damaged after the flexible resin conduit tube containing the electric wire is laid, there is a possibility that the electric wire inside may also be damaged. That is, the conduit is usually buried in concrete that constitutes the ceiling or wall, but the ceiling or wall made of concrete is then driven with anchor bolts or the like for mounting various equipment. Since the flexible conduit made of synthetic resin has lower mechanical strength than the metal conduit, it will easily break if the anchor bolt hits it. There is no problem in breaking the flexible conduit itself, but if the wire inside is damaged, there is no point in using a flexible plastic conduit tube containing the wire.

In the conventional method of pulling the electric wire after piping the flexible electric wire, even if the flexible electric wire is damaged by an anchor bolt or the like, if the electric wire can be pulled in, the electric wire will be used as it is. There is no danger of damage, and if the wire cannot be pulled in, it will be routed through another route, so there was no problem of wire damage.

[0007] In addition, when a flexible plastic conduit tube with an electric wire is carried into a construction site and the installation work is started, the end of the electric wire is retracted into the flexible conduit tube, and It was also found that there was a problem that it was difficult to remove the end.

In view of the above-mentioned problems, an object of the present invention is to prevent the electric wire inside from being damaged even if the synthetic resin flexible electric wire tube is torn after installation, and further, to connect the electric wire from the end of the flexible electric wire tube. The purpose is to provide a flexible conduit tube made of synthetic resin containing a wire, in which the end part of the cable can be easily taken out.

[0009]

[Means for Solving the Problems]

 One solution of the present invention to achieve this object is to insert one electric wire over the entire length in a flexible conduit tube made of synthetic resin having an inner diameter larger than the outer diameter of the electric wire (preferably three times or more). However, both ends of the flexible conduit made of synthetic resin are closed with caps. Furthermore, the end of the electric wire is retained by a cap.

Another solution of the present invention is to insert one electric wire over the entire length in a flexible conduit tube made of a synthetic resin having an inner diameter larger than the outer diameter of the electric wire (preferably three times or more). However, it is characterized in that caps are attached to both ends of a flexible conduit made of synthetic resin while the wires protruding from the ends of the flexible conduit are pushed into the flexible conduit.

[0011]

[Action]

 If the inner diameter of the synthetic resin flexible conduit is larger than twice the outer diameter of the wire, and preferably more than 3 times, the synthetic resin flexible conduit may be pierced by anchor bolts. However, since there is a space for the wire to escape inside the flexible conduit, the risk of damage to the wire is further reduced.

If caps for holding the ends of the electric wires are attached to both ends of the flexible electric wire tube, at the construction site, by removing the caps, the ends of the electric wires can be pulled out from the ends of the flexible electric wire tube. Is possible.

In addition, when the caps are attached to both ends of the flexible conduit tube while the wires protruding from the ends of the flexible conduit tube are pushed into the flexible conduit tube, when the caps are removed at the construction site, Since the electric wire that has been pushed into the flexible conduit tube protrudes, it is possible to easily pull out the end of the electric wire.

[0014]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Embodiment 1] FIG. 1 shows an embodiment of the present invention. This synthetic resin flexible electric wire tube 1 containing electric wires is composed of a synthetic resin flexible electric wire tube 2, a single electric wire 3 inserted into the flexible electric wire tube 2 over its entire length, and caps 4 at both ends.

The flexible conduit tube 2 made of synthetic resin is made of, for example, polyethylene or polyvinyl chloride, and has good flexibility due to corrugation. In the illustrated example, the inner and outer surfaces are corrugated, but only the inner or outer surface may be corrugated. Further, a straight pipe without corrugation may be used as long as the material is sufficiently flexible.

The electric wire 3 is a communication cable used for, for example, indoor wiring for fire alarm equipment, indoor wiring for speakers, and the like. Since this type of cable has a fixed type in one building and is used in a one-to-one relationship with a flexible conduit, it is particularly suitable as a flexible conduit made of synthetic resin containing a wire. The electric wire 3 has a circular cross section.

The inner diameter of the synthetic resin flexible electric wire tube 2 is larger than twice the outer diameter of the electric wire 3, and preferably three times or more. In a practical example, when the electric wire 3 is a 4-core or 3-core fire alarm cable with an outer diameter of 5.1 mm or 4.8 mm, a flexible plastic conduit tube 2 with an inner diameter of 16 mm is used.

Caps 4 made of synthetic resin are attached to both ends of the flexible electric wire tube 2. The cap 4 holds the end of the electric wire 3 to the end of the flexible electric wire tube 2 so that the end of the electric wire 3 does not retract into the flexible electric wire tube 2. For this reason, a recess 5 into which the electric wire 3 is firmly fitted is formed at the center of the inner surface of the cap 4. The inner end surface of the cap 4 is a tapered surface 6 whose inner diameter decreases toward the recess 5. The tapered surface 6 serves as a guide when pushing the end portion of the electric wire 3 into the recess 5. The outer diameter of the cap 4 is such a size that the cap 4 is fitted into the flexible electric wire tube 2 and frictionally engages with the flexible electric wire tube 2 so that the cap 4 cannot easily come off. A collar portion 7 is formed on the outer periphery of the rear end of the cap 4 and serves as a catch when the cap 4 is removed.

The flexible resin conduit tube 1 made of synthetic resin containing electric wires is usually several tens of meters long, and is shipped from the factory in a ring-shaped bundle and carried to the construction site. At the construction site, if the cap 4 is removed, the end of the electric wire 3 can be pulled out from the end of the flexible conduit 2 as shown in FIG. 2, so that terminal treatment can be performed immediately.

In order to pull out the electric wire 3 from the end portion of the flexible electric wire tube 2 by a length sufficient for terminal treatment, the length of the electric wire 3 is made slightly longer than that of the flexible electric wire tube 2, and when the cap 4 is attached. The electric wires 3 protruding from both ends of the flexible electric wire tube 2 may be pushed into the flexible electric wire tube 2. However, even if the lengths of the flexible conduit 2 and the electric wire 3 are the same, the electric wire 3 is stored in the flexible conduit 2 which is rolled into an annular shape with a sufficient margin, so that the electric wire 3 can be kept to some extent from the end. It is possible to draw out the length.

In order to prevent the electric wire 3 from coming off the cap 4 when the cap 4 is removed from the end of the flexible electric wire tube 2, an adhesive or the like is applied to the inner surface of the recess 5 of the cap 4. It is also effective to leave it.

The flexible resin conduit tube 1 made of synthetic resin containing an electric wire is laid while being cut to an appropriate length at a construction site. When the electric wire 3 is a fire alarm cable, the fire alarms are installed at intervals of several meters, so the fire alarm cable should be laid while cutting to a length suitable for it. After installation, it will be buried in the concrete that constitutes the ceiling and walls.

FIG. 3 shows a state in which the flexible electric wire tube 1 made of synthetic resin containing electric wires is embedded in concrete 8. In this state, it is not known from the outside where in the concrete 8 the flexible conduit tube 1 containing the electric wire is buried in the concrete 8. It is possible to punch out the conduit 2. However, even in such a case, the inner diameter of the flexible conduit 2 is larger than twice the outer diameter of the wire 3, so that the wire 3 is located inside the flexible conduit 2 to the right or left of the anchor bolt 9. There is room to escape, and there is little risk of damage by the anchor bolt 9. If the inner diameter of the flexible electric wire tube 2 is set to three times or more the outer diameter of the electric wire 3, the risk is further reduced.

Next, a method of manufacturing the synthetic resin flexible electric wire tube containing the electric wire of the present invention will be described. Since the synthetic resin flexible conduit with electric wires is as long as several tens of meters, it is not easy to draw the wires into the synthetic resin flexible conduit after manufacturing it. Therefore, as shown in FIG. 4, a method of drawing the electric wire 3 into the flexible electric wire tube 2 made of a synthetic resin is adopted.

That is, the flexible electric wire tube 2 is manufactured by extruding the synthetic resin tube 13 from the die 11 and the nipple 12 of the extruder and corrugating it with the corrugating machine 14 before it is solidified. At this time, the electric wire 3 is fed from the central hole of the nipple 12 and is taken out together with the flexible electric wire tube 2 to be manufactured. This makes it possible to easily manufacture a flexible conduit tube made of a synthetic resin containing an electric wire. However, if the electric wire 3 comes into contact with the synthetic resin tube 13 during the corrugation, the manufactured flexible electric wire tube 2 will be damaged, so the electric wire 3 is guided by the guide pipe 15 up to the point where it exits the corrugating machine 14. . In order to secure a space for installing the guide pipe 15, it is desirable that the inner diameter of the flexible electric wire tube 2 is larger than twice the outer diameter of the electric wire 3, and preferably three times or more.

Second Embodiment FIGS. 5 to 7 show another embodiment of the present invention. The synthetic resin flexible electric wire tube 1 containing electric wires is different from that of the first embodiment in the structure of the cap 4. That is, the cap 4 is configured such that the end portion of the electric wire 3 is bent and sandwiched between the first cap 4A and the second cap 4B.

The first cap 4A is a tubular member that is fitted into the end of the flexible electric wire tube 2 made of synthetic resin and frictionally engages, and a hole 21 into which the electric wire 3 can be inserted is formed on the inner end side thereof. ing . Further, a collar portion 22 is formed on the outer periphery of the outer end portion of the first cap 4A. The second cap 4B has an inclined surface 23 for bending the electric wire 3 formed on the inner end side, and a cylindrical portion 24 sized to fit inside the first cap 4A formed on the outer end side. A flange 25 is formed on the outer periphery of the outer end of the cylindrical portion 24. In addition, a tapered surface 28 is formed around the hole 21 to serve as a guide when the end portion of the electric wire 3 is inserted into the hole 21.

Further, an engagement concave portion 26 is formed on the inner peripheral surface of the first cap 4A, and an engagement convex portion 27 is formed on the outer peripheral surface of the cylindrical portion 24 of the second cap 4B (see FIG. 7). The engagement between the two prevents the second cap 4B from easily coming off the first cap 4A.

FIG. 5 shows a state in which the end portion of the electric wire 3 is sandwiched by the cap 4 attached to the end portion of the flexible electric wire tube 2. When the collar 4 of the first cap 4A is pulled from this state and the cap 4 is removed, the end of the electric wire 3 can be pulled out from the flexible electric wire tube 2 as shown in FIG. After that, if the second cap 4B is removed from the first cap 4A and the first cap 4A is pulled out, the terminal treatment of the electric wire 3 is ready.

When attaching a cap to the end of the flexible electric wire tube 2 in the manufacturing stage, as shown in FIG. 7, first insert the first cap 4A into which the end of the electric wire 3 is inserted. Then, push it into the end of the flexible conduit 2. Then, if the second cap 4B is pushed into the first cap 4A, the end portion of the electric wire 3 can be bent and sandwiched as shown in FIG.

Third Embodiment FIGS. 8 and 9 show still another embodiment of the present invention. The cap 4 of the flexible electric wire tube 1 made of synthetic resin containing electric wires is arranged to cover the outer side of the end of the flexible electric wire tube 2 made of synthetic resin. Inside the cap 4, a large number of elastic pieces 32 having inwardly facing claws 31 are formed, and the claws 31 grasp the ends of the electric wires 3. A deformable rib 33 is formed on the inner circumference of the inner end of the cap 4, and the rib 33 is inserted into the groove on the outer peripheral surface of the flexible electric wire tube 2 so that the cap 4 cannot be easily pulled out. It has become.

FIG. 8 shows a state in which the wire 3 has a slackened end. This is because the electric wire 3 is made longer than the flexible electric wire tube 2, and the electric wire 3 protruding from the end of the flexible electric wire tube 2 is pushed into the flexible electric wire tube 2 when the cap 4 is attached. It is due to. By doing so, the slack of the electric wire 3 is extended by removing the cap 4 as shown in FIG. 9, so that the electric wire 3 can be pulled out relatively long.

Fourth Embodiment FIGS. 10 and 11 show still another embodiment of the present invention. In this embodiment, the cap 4 does not have a portion for holding the end portion of the electric wire 3, but the electric wire 3 is made longer than the flexible conduit tube 2 made of synthetic resin so that the electric wire 3 protrudes from the end portion of the flexible conduit tube 2. When 3 is pushed into the flexible electric wire tube 2 when the cap 4 is attached, the end of the electric wire 3 comes into contact with the cap 4. Therefore, the end of the electric wire 3 does not retract into the flexible electric wire tube 2 even if there is no retaining portion at the end of the electric wire, and when the cap 4 is removed, the flexible electric wire tube 2 of the flexible electric wire tube 2 is removed as shown in FIG. The electric wire 3 projects from the end. Therefore, the end portion of the electric wire 3 can be easily pulled out.

The cap 4 covers the outside of the end of the flexible conduit 2, and the deformable rib 33 is formed on the inner circumference of the inner end of the cap 4. Same as 3.

[Embodiment 5] In the embodiment shown in FIG. 12, a push cap 10 having a long depth is fitted into one end of a flexible conduit tube 2 made of synthetic resin, whereby the electric wire 3 is connected to the other end of the flexible conduit tube 2. It is a flexible electric wire tube made of synthetic resin containing an electric wire that is protruded from the electric wire and has a cap 4 attached to the other end in this state. Also in this case, the same operational effect as that of the fourth embodiment can be obtained.

[0037]

[Effect of device]

 As described above, according to the present invention, since the electric wire is inserted into the flexible conduit made of synthetic resin in advance, the electric wire can be wired at the same time as the flexible conduit is laid, and the wiring work of the electric wire can be performed very efficiently. It can be carried out. Also, by removing the cap, the end of the electric wire can be pulled out from the end of the flexible conduit tube made of synthetic resin, so the end treatment of the electric wire can be easily performed. Furthermore, even if the flexible conduit is broken by anchor bolts etc. after installation, there is room for the wires to move and escape inside the flexible conduit, so there is very little risk of damage to the wires.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a synthetic resin flexible electric wire tube containing an electric wire according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which the end cap of the electric wire is pulled out by removing the end cap of the flexible electric wire tube containing the electric wire of FIG.

FIG. 3 is a cross-sectional view showing a laid state of a synthetic resin flexible electric wire tube containing an electric wire.

FIG. 4 is a cross-sectional view showing an example of a method of manufacturing a synthetic resin flexible electric wire tube containing an electric wire.

FIG. 5 is a cross-sectional view showing a second embodiment of a flexible resin conduit tube made of synthetic resin containing an electric wire according to the present invention.

FIG. 6 is a cross-sectional view showing a state where the end cap of the electric wire is pulled out by removing the end cap of the flexible electric wire tube made of synthetic resin with electric wire shown in FIG. 5;

FIG. 7 is a cross-sectional view showing a state in which the cap is attached to the end portion of the flexible electric wire tube in the synthetic resin flexible electric wire tube including the electric wire shown in FIG. 5;

FIG. 8 is a cross-sectional view showing a third embodiment of a flexible resin conduit tube made of synthetic resin containing an electric wire according to the present invention.

9 is a cross-sectional view showing a state in which the end cap of the electric wire is pulled out by removing the end cap of the flexible electric wire tube made of synthetic resin with electric wire shown in FIG.

FIG. 10 is a cross-sectional view showing a fourth embodiment of the flexible resin conduit tube made of synthetic resin with electric wires according to the present invention.

FIG. 11 is a cross-sectional view showing a state in which the end cap of the electric wire is pulled out by removing the end cap of the flexible electric wire tube containing the electric wire of FIG.

FIG. 12 is a sectional view showing a fifth embodiment of a synthetic resin flexible electric wire tube with electric wires according to the present invention.

[Explanation of symbols]

1: Synthetic resin flexible conduit tube with electric wire 2: Synthetic resin flexible conduit tube 3: Electric wire 4: Cap

Claims (3)

[Scope of utility model registration request] 1. A flexible electric wire tube made of synthetic resin (1) is inserted over a full length into a flexible electric wire tube (2) made of synthetic resin having an inner diameter larger than twice its outer diameter. A flexible conduit tube made of synthetic resin containing an electric wire, wherein caps (4) are attached to both ends of (2). 2. A flexible electric wire tube (3) made of synthetic resin, wherein one electric wire (3) is inserted into a flexible electric wire tube (2) made of synthetic resin having an inner diameter larger than twice its outer diameter. A flexible conduit tube made of synthetic resin containing an electric wire, wherein a cap (4) for holding an end of the electric wire (3) is attached to at least one end of (2). 3. A flexible electric wire tube made of synthetic resin (3) is inserted into a flexible electric wire tube (2) made of synthetic resin having an inner diameter larger than twice the outer diameter of the electric wire (3). A cap (4) is attached to at least one end of (2) with the electric wire (3) protruding from the end of the flexible conduit (2) being pushed into the flexible conduit (2). A flexible conduit tube made of synthetic resin containing an electric wire.