JPS6041774Y2 - Pipe connection device - Google Patents

Description

[Detailed explanation of the idea] (Purpose of invention) The present invention relates to an improvement of a pipe coupling device.

The purpose of the present invention is to enable easy, strong, and quick connection of electrical conduits and boxes, connectors, couplings, etc. that cannot be bonded or that are difficult to bond.

(Prior art) Polyethylene conduits cannot be bonded with adhesives, so methods such as screwing or wrapping tape are used to connect them to boxes, connectors, couplings, etc. However, it took time and effort to connect, and the bonding force was not sufficient, and the conduit sometimes slipped out from the connection with boxes, connectors, couplings, etc.

(Structure of the device) The present invention includes a clamping body having a protruding locking pawl on the inner surface and a convex or concave portion formed on the external surface, and a concave or convex portion that engages with the convex or concave portion on the external surface of the clamping body. It consists of a cylindrical socket formed on the inner surface.Examples will be described below based on the drawings.

FIRST EMBODIMENT FIGS. 1 and 2 show an embodiment in which the present invention is applied to a relatively soft electrical conduit without irregularities on its circumferential surface, such as a general polyethylene electrical conduit.

The clamping body 1 fitted into the conduit P has an inner diameter corresponding to the outer diameter of the conduit P, and is formed into a cylindrical shape of synthetic resin or metal, with a part of the circumferential surface extending in the axial direction. It is formed into a C-shaped cross section with a cut groove 3 cut along the entire length.

The cut groove 3 may be parallel to the axis or inclined relative to the axis, and the former is shown in FIG. 2.

The outer shape of the clamping body 1 along the axial direction may be parallel (straight) to the axis or inclined (tapered) to the axis.

One or more protrusions 2 are provided on the outer surface of the clamping body 1 in a circumferential direction.

The convex portion 2 in FIG. 2 is a serrated convex strip.

On the inner surface of the clamping body 1, one or more locking claws 4 with sharp tips are protruded.

When a plurality of locking claws 4 are provided, the positions of the locking claws 4 are provided on the same circumference, or each of the locking claws 4 is provided so as to be located on a spiral, or each of the locking claws 4 is arranged in a spiral manner. They may be provided randomly without specifying their positions.

The locking pawl 4 bites into the circumferential surface of the electric conduit P fitted into the clamping body 1 and prevents the electric conduit P from being pulled out.

A box 5 such as a switch box to which the conduit P is connected has a cylindrical socket 6 protruding from its side surface.
The inner surface is formed into a straight or tapered shape.

The inner diameter of the socket 6 is formed to be slightly smaller than the outer diameter of the clamping body 1, and when the clamping body 1 is inserted into the socket 6, the convex portion 2
is in contact with the inner surface of the recess 8 of the socket 6, and the clamping body 1 is strongly tightened from the outer periphery so that the inner diameter dimension is reduced.

Further, a convex portion 7 is formed on the inner surface of the socket 6 and comes into contact with a convex portion 2 formed on the outer periphery of the holding body 1.

The convex portions 7 may be provided in only one row on the inner surface of the socket 6, or may be provided in multiple rows.

In this embodiment, in order to connect the conduit P and the socket 6, the clamping body 1 is first fitted to the tip of the conduit P, and then the clamping body 1 is press-fitted into the socket 6.

When the inner surface of the socket 6 is formed into a tapered shape,
As the clamping body 1 is inserted into the socket 6, it is strongly tightened from the outer periphery, and the locking claws 4 strongly bite into the outer periphery of the conduit P, which is highly effective in preventing the conduit P from being pulled out from the clamping body 1.

When the clamping body 1 is inserted into the socket 6, the projection 2 of the clamping body 1 and the projection 7 of the socket 6 engage with each other, so that the clamping body 1 does not come out from the socket 6.

Second Embodiment This is an embodiment of a corrugated conduit, and as shown in FIG. It is shaped like a letter.

A locking pawl 4 is provided protruding from the inner surface of the holding body 1.

Since this locking pawl 4 does not bite into the circumferential surface of the conduit as in the first embodiment, the tip does not need to be sharp, and is located at the trough P' of the circumferential surface of the conduit P. It engages with P'' to prevent it from coming off.

After fitting the clamping body 1 into the conduit P, the clamping body 1 is inserted into the socket 6 in a press-fit state.

When the clamping body 1 is inserted into the socket 6, the convex part 2 of the clamping body 1 and the convex part 7 of the socket 6 engage with each other, so that the clamping body 1 does not come out from the socket 6.

In the above embodiment, the shape of the holding body was C-shaped in cross section, but it is also easy to form it as follows.

Third Embodiment As shown in FIG. 4, the holding body 1 of the third embodiment has a plurality of parallel cut grooves 3 formed at a predetermined depth from one end of the cylindrical body.

Similar to the first embodiment, the inner surface is provided with one or more numbers 4 protruding.

Fourth Embodiment As shown in FIG. 5, the holding body 1 of the fourth embodiment has a plurality of cut grooves 3 provided in parallel from both ends of the cylindrical body.

One or more locking claws 4 are provided protruding from the inner surface as in the first embodiment.

Fifth Embodiment As shown in FIGS. 6 and 7, a convex portion 12 is provided on the outer surface of a two-piece clamping body 11 along the circumferential direction as shown in FIGS. 6 and 7. A concave portion 18 is provided in the inner surface of the socket 6 in the shape of a concave groove along the circumferential direction, into which the convex portion 12 can fit and engage.

In this case, the clamping bodies 11 are made of a plurality of circular arc-shaped members, which are combined into a pair, and the clamping bodies 11 are inserted into the socket 6, and the electric conduit P is then press-fitted therein.

14 is a locking claw.

Sixth Embodiment As shown in FIGS. 8 and 9, a recess 28 is provided on the circumferential surface of the bisected clamping body 21 in the form of a groove along the circumferential direction, and the recess 28 is provided on the inner surface of the socket 6. A convex portion 22 that can be fitted and secured is provided on the convex strip along the circumferential direction.

In this case, the clamping bodies 21 are made by combining a plurality of circular arc-shaped clamping bodies 21 into a pair, and the clamping bodies 21 are inserted into the socket 6, and the electric conduit P is press-fitted later.

24 is a locking claw.

7th Embodiment As shown in FIGS. 10 and 11, a halved clamping body 3
A concave portion 38 may be provided on the circumferential surface of the socket 6 as a thank-you card, a convex portion 32 corresponding to the concave portion 38 may be provided on the inner surface of the socket 6, and the concave portion 38 and the convex portion 32 may be fitted.

34 is a locking claw. In the first to seventh embodiments described above, the connection between boxes and conduit tubes has been described, but the connector 41 shown in FIG. 12 and the coupling 4 shown in FIG.
Of course, it can be implemented in the same manner even if the number is 2.

Note that some electrical conduits are corrugated polyethylene pipes with a protective layer of vinyl chloride provided on the surface, and the present invention can also be applied to such electrical conduits.

(Effects of the invention) Since the present invention has the above-described configuration, it has the following advantages.

(1) Not only polyethylene conduits that cannot be bonded, but also corrugated conduits that are difficult to bond to boxes, connectors, couplings, etc. can be easily and firmly connected, and can be done quickly. , which has a great effect on improving workability.

(2) No expensive adhesive is required, there is no separation between the holding body and the socket due to poor adhesion, and the reliability of the connection is high.

(3) - By preparing in advance several types of clamping bodies with the same outer diameter and different inner diameters, it is possible to connect conduit tubes with different nominal dimensions with sockets of the same size, and the sockets can be connected to each socket. Since there is no need to form a large number of conduits to match the nominal dimensions of the conduit, the economical effect is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the first embodiment of the present invention, Fig. 2 is a perspective view of the clamping body, Fig. 3 is a sectional view of the second embodiment, and Fig. 4 is a perspective view of the clamping body of the third embodiment. , FIG. 5 is a perspective view of the clamping body of the fourth embodiment, FIG. 6 is a sectional view of the fifth embodiment, FIG. 7 is a perspective view of the clamping body, and FIG. 8 is a sectional view of the sixth embodiment. Fig. 9 is a perspective view of the holding body, Fig. 10 is a cross-sectional view of the seventh embodiment, Fig. 11 is a perspective view of the holding body, Fig. 12 is a cross-sectional view when it is applied to a connector, and Fig. 13 is a cup. FIG. 3 is a cross-sectional view when it is applied to a ring. Explanation of the symbols of the main parts, 1, 11, 21, 31...
・・Pinching body, 2, 12, 22, 32... Convex part,
8.18.28.38... recess, 6...
・Socket.

Claims (4)

[Scope of utility model registration request] (1) A clamping body having a concave arc-shaped inner surface corresponding to the outer circumference of the conduit P, a locking claw protruding from the inner surface, and a protrusion or a recess formed on the outer surface, and the clamping body is inserted and fitted. A pipe connecting device comprising a socket having a cylindrical shape and having a concave or convex portion that engages with a convex or concave portion of a holding body. (2) The pipe connecting device according to claim 1, wherein the holding body is a cylinder having a C-shaped cross section. (3) The pipe connecting device according to claim 1, wherein the holding body is a cylindrical body whose circumferential surface is notched at several places along the axial direction from the end. (4) Utility model registration in which the convex part on the outer surface of the clamping body is formed as a convex line or concave groove along the circumferential direction, and in contrast, the concave part or convex part on the inner surface of the socket is formed in a concave groove or convex line. A pipe connecting device according to claim 1.