JPH0244155Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a joint used to connect a corrugated flexible pipe to a wiring box such as a switch box.

[Background technology]

In indoor wiring in wooden houses, VVF cable wiring is generally used for power supply wiring for outlets and other high-power wiring, and the knock-out 2' in wiring box 1 such as a switch box as shown in Figure 1 is used. The VVF cable is directly drawn into the wiring box 1 through a wiring opening such as a hole obtained by removing the cable, and its end is connected to a wiring fixture fixed to the wiring box 1.

On the other hand, wiring for low electrical power such as for telephones and information uses generally requires a protection tube to protect the wires, and normally an electrician installs the protection tube for the information wires in advance. However, a method is to install a wiring box at the desired position from which the wires are drawn out, connect a protective tube to it, and then have a specialist other than an electrician insert the wires into the protective tube and wire the wires at a later date. It will be done. This is called advance piping for information cables, etc. When such preliminary piping is performed, a corrugated flexible tube is often used as the protection tube, as it has excellent flexibility and is suitable for wiring in places with many bends.

Since the corrugated flexible tube cannot be connected to a general heavy-duty (cable wiring) wiring box (knock-out type, etc.) as shown in Figure 1, the second
It is connected to a wiring box 3 with a hub dedicated to connecting the protective tube as shown in FIGS. As shown in the figure, this wiring box 3 is provided with two wiring openings 4 on each side, and a hub 5 for connecting a corrugated flexible tube is installed outside each opening 4. A recess 5a extending along the axial direction is provided on the inner circumferential surface of the hub 5, and a groove 5 is provided at the back of the recess 5a.
b is provided. For connecting corrugated flexible pipes, the third
As shown in the figure, one end of the outer surface has a protrusion 6a that is fitted into the recess 5b of the hub, and the inner surface has a protrusion 6b that is fitted into the recess (groove) 7a of the corrugated flexible tube 7. A locking tool 6 is used. Using this locking device 6, the corrugated flexible tube 7 is connected to the box 3, for example, in the following manner. That is, after the locking tool 6 is placed on the corrugated flexible tube 7 so that the protrusion 6b is fitted into the recess 7a, the locking tool 6 is inserted into the recess 5a and the corrugated flexible tube is placed. 7 into the hub 5, and insert the protrusion 6a of the lock into the groove 5b of the hub.
be inserted into. Then, the locking tool 6 cannot be removed from the hub 5, and the corrugated flexible tube 7 is also locked by the locking tool 6 and cannot be removed from the hub 5.

As mentioned above, electrical wiring work for a single house requires:
It was necessary to prepare two types of wiring boxes: one for heavy electrical power (for cable wiring) and one with a hub. Currently, on average, about 40 switchboxes for heavy-duty electricity are used per household.
The number of wiring boxes for light electricity is small, as only two to three switch boxes for light electricity are used. Nevertheless, it was extremely troublesome to have to prepare a wiring box with a boss for low power in addition to a wiring box for high power. Also,
If it becomes necessary to add an information line at a later date and you want to connect the information line to the existing wiring box, but if the existing wiring box is for general heavy electricity use, you will have to replace it with one with a hub. There was a problem that it was not possible.

[Purpose of invention]

This invention was made in view of the above circumstances, and its purpose is to provide a joint that allows a flexible tube to be connected to a general heavy-duty electrical wiring box.

[Disclosure of invention]

In order to achieve the above-mentioned purpose, this invention has two cylindrical bodies on both sides of the annular corrugated flexible tube insertion port.
The two locking parts of the divided semi-cylindrical corrugated flexible tube are bendably connected via the hinge part, and the corrugated flexible tube is attached to the inner circumferential surface of at least one of both locking parts. A protrusion is provided to be inserted into the recess, and a groove is provided at the tip of the outer peripheral surface into which the edge of the wiring opening of the wiring box is fitted, so that both locking parts face each other to form a cylindrical body. When both locking parts are bent, a gap is formed between both locking parts that allows the diameter of the tip of the cylindrical body to become smaller than the wiring opening of the wiring box. Its gist is joints for flexible pipes. Hereinafter, this invention will be explained in detail based on drawings showing embodiments.

FIGS. 4 and 5 show an embodiment of the corrugated flexible pipe joint according to this invention. As shown in the figure, this joint 8 has locking portions 10, 10 of a semi-cylindrical corrugated flexible tube, which is formed by dividing a cylinder into two, on both sides of an annular corrugated flexible tube insertion port 9. are rotatably connected to each other by a hinge portion 11. Here, since the entire joint is made of a flexible material such as synthetic resin, the locking part 10 can be freely rotated with respect to the insertion port 9 by the hinge part 11 made of a thin piece. It's summery. both locking parts 10,
A protrusion 12 is provided on the inner peripheral surface of the tube 10 to be inserted into the recess of the corrugated flexible tube, and a groove 13 is provided at the tip of the outer peripheral surface into which the edge of the wiring opening of the wiring box is fitted. . Here, the bottom of the groove 13 is adapted to fit exactly with the end surface of the wiring opening. However, it does not necessarily have to be this way. Both side end surfaces of the locking part 10 are tapered surfaces, so that when both the locking parts 10, 10 are brought together, the gap 14 that was widened earlier is created between them, as shown in FIG. It's getting old.

Using this joint, the corrugated flexible tube is connected to the heavy-duty wiring box as shown in FIG. First, the two locking portions 10, 10 are brought together and the tips of both are inserted into the wiring opening 2 of the wiring box 1, and the edges of the opening 2 are fitted into the grooves 13 of both. In this embodiment, both end surfaces of both the locking portions 10, 10 are tapered surfaces, so that the diameter of the tip portion of the cylindrical body formed by joining the locking portions can be reduced.
Therefore, the tips of both the locking parts 10, 10 can be easily inserted into the opening 2. Further, if the hinge portion 11 is made of an elastic material such as synthetic resin, both the locking portions 10, 10 tend to expand due to the elasticity of the hinge portion 11. Therefore, the edge of the opening 2 strongly bites into the grooves 13 of both locking portions, reducing the possibility that the joint 8 will come off from the wiring box 1 due to vibration or the like. Next, the corrugated flexible tube 7 is inserted through the insertion port 9, and the protrusions 12 of both locking portions are engaged with the recesses 7a of the corrugated flexible tube 7. Then, the corrugated flexible tube 7 is locked to the joint 8. In addition, by inserting the tip of the corrugated flexible tube 7 deep into the joint 8, the tips of both locking parts 10, 10 are widened, and the edge of the opening 2 is aligned with the groove 13 of both locking parts. It bites in strongly, and the joint 8 is firmly fixed to the wiring box 1.

As mentioned above, if the joint according to this invention is used, a corrugated flexible pipe can be easily connected to a heavy electrical wiring box (knock-out type, etc.). Therefore, only one type of wiring box for heavy electric current needs to be used, and the procurement and inventory management of wiring boxes becomes easy. In addition, since wiring boxes with hubs are used in small quantities, they cannot be mass-produced, and they are extremely expensive, 3 to 4 times as expensive as knock-out type wiring boxes for heavy electrical power.
As a result, the cost of wiring work for low-power electricity has become high. However, by using the joint according to this invention, it has become possible to reduce the cost of wiring work for light electric power by using an inexpensive knock-out type wiring box for heavy electric power. Furthermore, even if new wiring for low power is required, it is now possible to use existing wiring boxes for high power. Note that the protrusion or groove provided on the locking portion may be provided only on one of the locking portions. Further, the protrusion inserted into the recess of the corrugated flexible tube does not have to be long and semicircular as in the embodiment, but may be short. Also, the number of installations is not limited to one; for example,
A plurality of them may be provided along the length of the corrugated flexible tube when inserted into the joint, or a plurality of them may be provided along the circumferential direction of the inner surface of the locking part. Good too.

[Effect of idea]

Since the corrugated flexible pipe joint according to this invention is constructed as described above, it is possible to connect a flexible pipe to a heavy electrical wiring box.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a heavy-power wiring box, Figure 2 is a perspective view of a wiring box with a hub, Figure 3 is an explanatory diagram of how a corrugated flexible tube is connected to the wiring box, and Figure 4 is an illustration of this invention. FIG. 5 is a perspective view of one embodiment of the corrugated flexible pipe joint with both locking parts open; FIG. 5 is a perspective view of the same corrugated flexible pipe joint with both locking parts together; FIG. 6 is an explanatory diagram of a state in which a corrugated flexible tube is connected to a heavy electric wiring box using the same corrugated flexible tube joint. 1...Wiring box for heavy electrical power, 2...Wiring opening, 7...Corrugated flexible tube, 7a...Recess, 8...Joint, 9...Corrugated flexible tube insertion port, 10...Partner stop,
11...Hinge portion, 12...Protrusion, 13...Groove.

Claims (1)

[Scope of utility model registration request] Two locking portions of a semi-cylindrical corrugated flexible tube formed by dividing a cylinder into two are connected to both sides of the annular corrugated flexible tube insertion port so as to be freely bendable via hinge portions, respectively. The inner peripheral surface of at least one of both locking parts is provided with a protrusion that is inserted into the recess of the corrugated flexible tube, and the outer peripheral surface tip is provided with a groove into which the edge of the wiring opening of the wiring box is fitted. A gap that allows the diameter of the tip of the cylindrical body to be smaller than the wiring opening of the wiring box when both the locking parts are bent so that they face each other to form a cylindrical body. A corrugated flexible pipe joint in which a is formed between both locking parts.