JPH0510496Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a coupling for a threadless conduit.

<Conventional technology and its problems> Thick steel conduit without threads is cut at a construction site and the circumferential surface of the conduit is pressed against the circumferential surface of the coupling body as a coupling for interconnecting piping. It is known that a plurality of push bolts to be fixed are threaded. When connecting piping using this, the cut ends of the conduit pipes that have been added and dispatched from the distribution board or other wiring boxes are butt-connected at the final stage of the piping work. It is necessary to first insert and set a coupling into one of the two conduits to be butt-connected.

Therefore, in the conventional coupler, a separate partition bolt is screwed into the coupling body from an intermediate position in the longitudinal direction to stop the cut end of the conduit, and by screwing it back, the wire can be removed. It is designed so that the coupling can be inserted and set into the pipe.

However, in this case, the partition bolt must be moved forward and backward one by one, which is extremely troublesome to operate, and there is also a risk that the bolt may accidentally fall off from the coupling body during transportation. Furthermore, in order to achieve a waterproof effect during use, it is necessary to insert and install waterproof packing in the place where the bolt is planted, which increases the manufacturing cost.

<Means for Solving the Problems> The present invention is designed to solve these problems, and for this purpose, the circumferential surface of the conduit received in the hollow cylindrical coupling body is fixed by pressing. In order to achieve this, the coupler has a plurality of push bolts screwed into the circumferential surface of the coupler body, and a waterproof packing made of an elastic material is fitted and integrated into each of the opening ends of the coupler body, and also in the coupler body. A partition packing also made of an elastic material is fitted into the middle part, and a stop lip with a wedge-shaped cross section intersecting the longitudinal centerline of the coupling body at an acute angle of less than 90 degrees is integrally extended inward from the partition packing, When a conduit is inserted into the coupling body from one direction, the lip acts to tilt the conduit to allow it to pass through, and conversely, when the conduit is inserted from the other direction, the lip acts on the conduit to allow it to pass through. It is characterized in that it is configured to be able to prevent the electrical conduit from penetrating by colliding with the cut end and causing an erecting action.

<Example> Hereinafter, the specific structure of the present invention will be described in detail based on the illustrated example. In FIGS. 1 to 4 showing the coupling for a threadless conduit, 10 is a hollow hole having a certain length and diameter. It is a cylindrical metal coupling body, and at least a pair of front and rear screw holes 11 are opened through its circumferential surface.

Reference numeral 12 denotes a push bolt which is screwed into each of the screw holes 11 so as to be able to move forward and backward from the outside, and the tip of the push bolt presses and fixes the circumferential surface of the conduit P to prevent it from coming off. At the same time, the large-diameter head of the push bolt 12 is also connected to the coupling body 1.
The receiving convex seat 13 integrally protrudes outward from the circumferential surface of 0, so that the receiving convex seat 13 is stably encapsulated without being able to collide with other objects.

The number of push bolts 12, their receiving screw holes 11, and convex seats 13 are increased when the coupling is large, and
They are arranged radially symmetrically with respect to the circular center of zero. Reference numeral 14 denotes a recess provided in the head of the push bolt 12 for locking a rotating tool, and has a hexagonal opening. Incidentally, as shown in a modification shown in FIG. 5, the convex seat 13 may be omitted.

Further, reference numeral 15 denotes grooves for receiving waterproof packing, which are located at both front and rear ends of the coupling body 10 and formed on the inner circumferential surface of the opening thereof. The infiltration of rainwater, etc. from the outside is prevented. The waterproof packing 16 is formed into a ring shape from an elastic material such as rubber or synthetic resin, and is maintained in the following fitted state in relation to the coupling body 10.

That is, the outwardly projecting flange 16a at the rear end of the waterproof packing 16 is fitted into the concave groove 15 of the coupling body 10, and the outwardly projecting flange 16a at the entrance section is also fitted into the groove 15 of the coupling body 10.
b is attached to the opening edge of the coupling body 10. Moreover, the lip 16c protrudes inward from the inner peripheral surface of the coupling body 10 by a certain amount L from the inner circumferential surface of the coupling body 10, and intersects the longitudinal center line Y-Y of the coupling body 10 at a right angle θ. The inner circumferential surface of the waterproof packing 16 itself, which is formed in a continuous and integral manner and is located on both front and rear sides of the lip 16c, is larger than the inner circumferential surface of the coupling body 10 by a certain dimension W.
In other words, the opening is made larger in diameter so as to be retracted outward.

Therefore, the inwardly protruding lip 16c of the waterproof packing 16 acts in both directions, allowing the conduit P to be received into the coupling body 10 from either direction A or B.
This can be fixed with the push bolt 12 to prevent it from coming off. Also, that fallen lip 16
As is clear from FIG. 6, c has a retraction effect due to the above-mentioned constant dimension W, and its restoring elasticity brings it into close contact with the inner circumferential surface of the conduit P.

As shown in FIG. 4, the front and rear pairs of waterproof packings 16 are the same and are fitted and integrated into the coupling body 10 in a mutually symmetrical form.

Further, reference numeral 17 denotes a groove for receiving a partition packing, which is located in the middle part of the coupling body 10 in the longitudinal direction and is also provided on the inner peripheral surface of the opening thereof, and is fitted with a partition packing made of the same material as the waterproof packing 16. 18 is fitted.

The partition packing 18 also has an annular shape, but from now on, the stop lip 18a that projects inward by a certain amount H from the inner peripheral surface of the coupling body 10 is located along the longitudinal center line Y-Y of the coupling body 10. It forms an acute angle γ of less than 90 degrees and is formed so as to protrude continuously and integrally as a wedge-shaped cross section with intersecting inclinations. Furthermore, the protruding tip portion is sharpened.

When the conduit P is inserted into the coupling body 10 from the forward direction A with respect to the stop lip 18a which is previously inclined in one direction, the lip 18a smoothly moves as shown in FIG. The inclining action allows the electrical conduit P to pass through. Also, when the conduit P is inserted into the coupling body 10 from the opposite direction B, the conduit P
The cut end of the lip 18a collides with the lip 18a, and the lip 18a stands up at a right angle as shown in FIG. 8, and its so-called wedge action prevents the conduit P from penetrating. .

In other words, the partition packing 18 allows the conduit P to pass through the coupling body 10 in one direction A, and similarly allows the conduit P to penetrate in the other direction B, due to its inwardly protruding stop lip 18a. It is constructed so that it is automatically dammed at the middle part within the coupling body 10, and therefore, when inserting the conduit P into the coupling body 10 from both directions, the cut end of the conduit P is inserted into the coupling body 10 from both directions. The comrade via the lip 18a,
A reliable communication connection state is automatically maintained, and the push bolt 12 securely secures the connector to prevent it from coming off.

<Effects of the Invention> As described above, in the present invention, in order to press and fix the circumferential surface of the conduit P received in the hollow cylindrical coupling body 10, the plurality of push bolts 12 are pressed against the circumferential surface of the coupling body 10. In the coupler screwed into place, waterproof packings 16 made of an elastic material are fitted and integrated into both open ends of the coupler body 10, and a partition packing 16 also made of an elastic material is inserted into the middle part of the coupler body 10. 18 and intersects the longitudinal center line Y-Y of the coupling body 10 from the partition packing 18 at an acute angle γ of less than 90 degrees.
8a is extended inward and a conduit P is inserted into the coupling body 10 from one direction A, the lip 18a acts to tilt down so as to allow the conduit P to pass through.
Conversely, when the conduit P is inserted from the other direction B, the lip 18a collides with the cut end of the conduit P and acts to raise it up, thereby preventing the conduit P from penetrating. Therefore, although the required configuration is extremely simple, it has the effect of reliably solving the problems of the prior art mentioned at the beginning.

That is, according to the configuration of the coupling according to the present invention, the partition packing 18 made of an elastic material is fitted into the middle part of the coupling main body 10, and the stopper lip 18a that projects inwardly and integrally extends by itself. It is elastically deformed in an undulating manner to allow the conduit P to pass through the coupling body 10 in one direction A, and to prevent the conduit P from penetrating in the opposite direction B. As suggested, the cut ends of both electrical conduits P1 and P2, which have been dispatched from the distribution board or other wiring boxes M in a spliced state, are butted and connected at the final stage of the piping work. In such a case, in order to push each conduit P1, P2 through the coupling main body 10 in one direction A, the coupling itself should be pushed into one conduit P1 as shown in the figure, or After changing the direction back and forth, as shown in the above figure, the cut ends of both the conduit pipes P1 and P2 are inserted and set into the other conduit P2 and retracted from the final meeting point X. You can match like-minded people correctly.

In the state shown in FIG. 9 in which the partition is inserted and set to be retracted, the restraining lip 18a of the partition packing 18 will temporarily act to tilt down, as is clear from FIG. 7.

Therefore, even after the cut ends of both conduits P1 and P2 are butted together as described above, the coupling body 10 is inserted into the first position along the conduit conduits P1 and P2.
As shown in Fig. 0, the stopper lip 18a of the partition packing 18 can be returned to the abutting point X, as shown in Fig. 6, and will automatically return to its perpendicular standing position. As a result, the coupling of the present invention is able to properly connect and fix the conduit pipes P1 and P2 at the final butting point X, since this acts as a restraint to the cut end of the other adjacent conduit pipe. becomes.

Therefore, there is no need to manually move the partition bolts forward and backward each time as mentioned at the beginning, and the conduit
This has the effect of allowing high-efficiency connection work from beginning to end on the piping. Also, the above partition packing 18
Since it literally has a waterproof effect, there is no need to add special waterproof packing to the part where the partition bolts are installed as mentioned at the beginning.

Further, since the partition packing 18 is fitted in advance into the middle part of the coupling body 10, there is no fear of it falling off accidentally, and a stable and durable connected state of the conduit P is always obtained. There is also an effect that can be done.

In addition, since waterproof packing 16 is fitted and integrated into both the front and rear ends of the coupling body 10, a waterproof effect can be achieved when the conduit P is connected and used, and furthermore, the front and rear pairs of the waterproof packing 16 are Since they are the same and can be easily fitted into the coupling body 10 in the same way as the partition packing 18, it can be said to be suitable for practical use and has good mass productivity.

[Brief explanation of the drawing]

Figure 1 is a slope view of the coupling according to the present invention.
Figure 2 is a side view, and Figure 3 is 3-3 in Figure 2.
4 is a sectional view taken along the line 4-4 in FIG. 3; FIG. 5 is a half-cut sectional view of a modification corresponding to FIG. 4;
Fig. 6 is a side sectional view showing how the conduit is connected and used by the coupling, Fig. 7 is a side sectional view showing how the coupling is inserted into the conduit from one direction, and Fig. 8 is the same when the conduit is inserted from the other direction. Fig. 9 is a side sectional view showing the insertion operation state, and Fig.
FIG. 0 is a schematic cross-sectional view showing a state in which the connection is completed. 10... Coupling body, 12... Push bolt, 15, 17... Receiving groove, 16... Waterproof packing, 16c... Lip, 18... Partition packing, 18a... Stopping lip, P... Electric conduit , Y-Y...Longitudinal center line, L, H...Protrusion amount, θ, γ...Cross angle.

Claims (1)

[Claims for Utility Model Registration] 1. In order to press and fix the circumferential surface of the conduit P received in the hollow cylindrical coupling body 10, the plurality of push bolts 12 are attached to the coupling body 10.
In a coupling screwed into the circumferential surface of the coupling body 10, to both opening ends of the coupling body 10,
A waterproof packing 16 made of an elastic material is fitted and integrated into the middle part of the coupling body 10.
Partition packing 18 also made of elastic material
At the same time, the partition packing 1
8 to the longitudinal centerline of the coupling body 10 Y-
A stop lip 18a having a wedge-shaped cross section intersecting Y and an acute angle γ of less than 90 degrees is integrally extended inward, and the conduit P is connected to the coupling body 10.
When inserted from one direction A , the conduit P
When the conduit P is inserted from the other direction B , the lip 18a collides with the cut end of the conduit P and acts to raise it. , a coupling for a screwless electrical conduit, characterized in that the electrical conduit P is set to be restrained in a non-penetrating state. 2 Place the waterproof packing 16 onto the coupling body 1.
The lip 16c intersects the longitudinal centerline Y-Y of the coupling main body 10 at a right angle θ and integrally projects inward from the waterproof packing 16. Scope of Claim for Utility Model Registration/No. 1
Coupling for threadless conduit as described in section.