JPH0127378Y2 - - Google Patents

Description

[Detailed description of the invention] (Prior art) Conventionally, when connecting electric conduit tubes, especially corrugated electric conduit tubes whose outer surfaces are formed with waves having alternating peaks and valleys, a method of connecting electric conduit tubes having claws on the inner surface has been used. Generally, a ring-shaped connecting body is inserted into a socket, a corrugated conduit is inserted into the socket in this state, and the waves of the corrugated conduit are engaged with the claws. It is true. Although this could connect corrugated conduits, it was virtually impossible to remove the corrugated conduits without destroying the socket.

Therefore, it was very inconvenient if a mistake was made in connecting the conduit.

(Purpose) The present invention has been developed in view of the prior art, and its purpose is to immediately pull out and remove the conduit even if a mistake is made in connecting the conduit.

(Structure) The feature of the structure of the present invention is that it consists of a cylindrical socket into which the conduit is inserted, and a connecting body attached to this socket, and the inner surface of the connecting body has a structure that can be expanded outward. It has a protruding claw located on the inner surface of the socket, and a circumferential taper part is formed from one side of the claw toward the tip of the claw, and the connecting body is rotated in the circumferential direction of the socket. Specifically, the taper portion located on the inner surface of the socket is allowed to rise to the periphery of the socket, and the claws are expanded outward to release the engagement between the electric conduit and the claws.

The drawing shows a typical example in which the present invention is applied to a corrugated conduit connecting device, and the present invention will be explained in detail below with reference to this example.

1 is a cylindrical socket, which may be used as a connector as shown in Fig. 6, or as a coupling ring as shown in Fig. 7;
As shown in the figure, it may be manufactured and used integrally with an electrical wiring box such as an outlet box or a switch box, or even with a hub. The socket 1 only needs to be one that allows the electrical conduit to be inserted therethrough. The socket 1 of this example has a through hole 1a in the peripheral wall, for example, in the vicinity of the tip opening. The through hole 1a may be open only in the radial direction of the socket 1 as in the example shown in FIG.
As shown in the example shown in the figure, the radial direction opens and the socket 1
The tip may be open.

2 is a corrugated electric conduit, which has corrugations 2a having alternating peaks and valleys on its outer surface.

3 is a connecting body attached to the socket 1, and this is for connecting the corrugated electric conduit 2 and the socket 1.

Reference numeral 4 denotes a claw for hooking and engaging the wave 2a on the outer surface of the corrugated electric conduit 2, and this claw is integrally provided on the inner surface of the connecting body 3 in a protruding manner. The claw 4 has a structure that allows it to expand outward, that is, in the direction of arrow N. The reason why it is made expandable is mainly to release the hook latching between the waves 2a of the corrugated electric conduit 2 and the claws 4 by expanding the claws 4. In the case of the expansion structure shown in FIGS. 1 to 5, the connecting body 3 is made of an elastic resin so as to have a C shape, and the connecting body 3 is expanded, whereby the claws 4 In the case of the example shown in FIGS. 9 and 10, the connecting body 3 is made of a ring-shaped elastic resin, and is approximately L-shaped. The slits 5 allow the elastic arms 6 to expand outward, thereby causing the claws 4 protruding from the inner surface of the elastic arms 6 to expand outward, that is, in the direction of arrow N. I am planning to open it. The structure for expanding the claws 4 is not limited to the example described above, and other structures may be used.In short, the claws 4 must have the function of being able to expand and the function of being able to hook and lock onto the outer surface of the conduit. That's enough.

In FIGS. 1 and 9, 8 is a tapered portion formed on the side of the claw 4, which extends in the circumferential direction, and is tapered so that the width dimension D becomes narrower toward the tip of the claw 8a. tilted towards the direction. In the example shown in the drawings, the tapered portion 8 is a straight inclined surface as shown in FIGS. 1 and 9, but it is of course not limited to this and may be modified in various ways. In short, as will be described later, it is sufficient to have the function of climbing the periphery of the through hole 1a and expanding the claws 4 outward. In addition, as in the example shown in the drawing, the claw 4
It is desirable to form the notch 9 on the opposite side of the tapered portion 8.

To explain a typical procedure for connecting the corrugated electric conduit 2 and the socket 1 using the connecting body 3, first, the claw 4 of the connecting body 3 is fitted into the through hole 1a of the socket 1.
In the example shown in FIGS. 1 to 5, the connecting body 3 is expanded slightly outward with fingers or the like, and the claw 4 is fitted into the through hole 1a, and the connecting body 3 is inserted into the protrusion 10 of the socket 1. be adjacent to In the example shown in FIGS. 9 and 10, a protruding piece 11 protruding from the connecting body 3 is fitted into an elongated hole 12 of the socket 1. As mentioned above, the connection body 3
Once installed in the socket 1, the corrugated electric conduit 2 is inserted into the socket 1. By the way, as shown in FIGS. 6 to 8, the claw 4 is desirably formed to have a substantially right-angled cross section with an inclined surface 13 whose protrusion becomes larger from the front side toward the back side. Note that the substantially right triangular cross section includes both the case of the claw 4-1 shown in FIGS. 6 and 7 and the case of the claw 4-2 shown in FIG. That is, in the case of the claw 4-1 shown in FIGS. 6 and 7, it has an inclined surface 13 and a straight surface 14, but in the case of the claw 4-2 shown in FIG. It has an inclined surface 15 having a different angle of inclination.

If the claw 4 is made to have a substantially right triangular cross section as described above, when the corrugated conduit 2 is inserted into the socket 1, the waves 2a of the corrugated conduit 2 will be formed on the inclined surface of the claw 4 that has a substantially right triangular cross section. 13, when inserting the corrugated electric conduit 2 into the socket 1, the claws 4 can be naturally expanded outward, that is, in the direction of the arrow N, with a small insertion force.

As a result, the corrugated conduit 2 is inserted into the socket 1 with a small insertion force.
can be connected to Note that since the amount of expansion is greater at the tip of the connecting body 3 shown in FIG. 1 or the tip of the elastic arm 6 shown in FIG. There is an advantage that the insertion force for the tube 2 can be smaller.

By the way, in the examples shown in FIGS. 1 to 5 and the examples shown in FIGS. 9 and 10, a notch 9 is formed in the claw 4, and when the connecting body 3 is attached to the socket 1, the notch 9 is formed into a through hole. 1a, thereby locking the outward expansion of the claw 4, thereby making the claw 4 and the wave 4a
The structure ensures reliable hooking and locking.

Now, if you make a mistake in connecting the corrugated conduit 2 and remove the corrugated conduit 2 attached to the socket 1,
Rotate the connecting body 3 in the circumferential direction of the socket 1. As a result,
The tapered portion 8 of the claw 4 fitted into the through hole 1a climbs the periphery of the through hole 1a as shown in FIGS. 4 and 10. In this way, as the tapered portion 8 climbs the periphery of the through hole 1a, the claws 4 expand outward,
As a result, the engagement between the claw 4 and the corrugations 2a of the corrugated electric conduit 2 is released. If the corrugated electric conduit 2 is pulled out from the socket 1 in this released state, the corrugated electric conduit 2 can be easily removed.

In the above-mentioned example, two claws 4 are provided protrudingly opposed to each other as shown in the figure, but the number, location and shape of the claws 4 may be varied as necessary. In addition, in the case of the example shown in FIGS. 9 and 10, the protrusion 11 protruding from the connecting body 3 is hooked into the hole 12 through which the socket 1 passes, but instead of this, the protrusion 11
The connecting body 3 may be hooked into a not-penetrating recess (not shown) of the socket 1, or the connecting body 3 may be attached to the socket 1 by other means. Further, in the above example, the present invention is applied to a connecting device for corrugated electric conduit 2, but the present invention is not limited to this, and an ordinary electric conduit with a smooth outer surface is used, and claws 4 are attached to the outer surface of the conduit.
It may also be applied to a connecting device that is hooked and locked by biting into the connecting device, and in this case as well, by the tapered portion 8 of the claw 4 climbing the periphery of the through hole 1a,
The hook lock is released.

(Effects) As explained in detail above, in the present invention, the taper portion 8 of the claw 4 that is fitted into the through hole 1a is allowed to climb up to the periphery of the socket 1, thereby pushing the claw 4 outward. Since the conduit is expanded to release the hooking lock between the conduit and the claw 4, if the conduit is pulled out in this released state, the conduit can be removed from the socket 1 quite easily. . Therefore, it is convenient if you make a mistake in connecting the conduit.

In the case of the example in which the notch 9 is formed in the claw 4, the notch 9 is fitted into the periphery of the through hole 1a when the connecting body 3 is attached to the socket 1, thereby preventing the claw 4 from expanding outward. Since the configuration prevents the claws 4 from opening, even if an unexpected external force is applied during use, the claws 4 can be reliably prevented from expanding outward, thereby preventing the claws 4 and the conduit from expanding. It is possible to prevent the electric conduit from being disengaged from the outer surface and from coming off from the socket 1.

[Brief explanation of the drawing]

The drawings show a typical example of the present invention; FIG. 1 is a perspective view of the state before the coupling body is attached to the socket, FIG. 2 is a perspective view of the state after the coupling body is attached to the socket, and FIG. Fig. 3 is a perspective view of the tapered portion rising to the periphery of the through hole, Fig. 4 is a sectional view of the same, Fig. 5 is a sectional view of the state after the connecting body is attached to the socket, and Figs. 8th
The figure is a longitudinal sectional view of the present invention applied to a connector, a coupling, and a box. Figures 9 and 10 show another example, and Figure 9 shows the first example.
FIG. 10 is a diagram equivalent to FIG. 4. 1 is a socket, 1a is a through hole, 2 is a corrugated conduit, 3
4 is a connecting body, 4 is a claw, 8 is a tapered portion, and 9 is a notch.

Claims (1)

[Scope of utility model registration request] It consists of a cylindrical socket into which the conduit is inserted, and a connecting body attached to this socket, and a connector is provided on the inner surface of the connecting body so as to be expandable outward and protrude so as to be located on the inner surface of the socket. A tapered part is formed in the circumferential direction from one side of the claw toward the tip of the claw, and by rotating the connecting body in the circumferential direction of the socket, the taper is located on the inner surface of the socket. A conduit removal structure for a conduit coupling device, characterized in that the conduit is disengaged from the conduit by allowing the conduit to climb onto the periphery of the socket and expanding the pawl outward to release the lock between the conduit and the pawl.