JP3566883B2 - Corrugated pipe connection structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connection structure of a corrugated pipe used as a protective pipe when cables such as electric wires, communication lines, and optical fibers are buried underground.
[0002]
[Prior art]
Conventionally, as shown in FIGS. 4 and 5, a protective tube (1) for protecting cables such as optical fibers and communication cables is a corrugated structure in which convex ring portions (2) and concave groove portions (3) are alternately arranged. A pair of such protective tubes (1,1) is connected by a pipe joint (14).
A rubber packing ring (19) is mounted on the concave groove (3) at the connection end of the protective tube (1), and the protective tube (1) is connected by a frictional force of the packing ring (19). It is fixed in the joint (14).
[0003]
[Problems to be solved by the invention]
In the conventional pipe connection structure described above, since the pipe is fixed only by the frictional force of the packing ring (19), the fixing force is not sufficient, and the protective pipe (1) is easily detached from the pipe joint (14). was there.
[0004]
[Means for Solving the Problems]
According to the present invention, as a means for solving the above-mentioned conventional problems, an annular concave groove (6) is provided at a predetermined position on the inner periphery of a collar member (4), and a corrugated pipe (1) inserted into the collar member (4) is provided. Of the collar member (4) and the annular groove (6) of the collar member (4), have an S-shaped cross section therebetween, and have leaf spring portions (10, 10 ) Is provided, the inner peripheral leaf spring portion (10) is engaged with the concave portion (3) of the corrugated pipe (1) , and the outer peripheral leaf spring portion (10) is an annular concave groove of the collar member (4) . Provided is a connection structure for a corrugated pipe (1) with a locking ring (9) engaging with (6) interposed therebetween.
Further, according to the present invention, the collar member (4) has openings (5) at both left and right ends, and further has a pair of left and right annular concave grooves (6), so that the left and right openings (5) of the collar member (4) are provided. A pair of corrugated pipes (1) are inserted from above, a concave part (3) at a predetermined position of the pair of corrugated pipes (1) and an annular concave groove (6) of the collar member (4) are respectively fitted, and between them. It has an S-shaped cross section , and a leaf spring portion (10, 10) is provided on the inner periphery and the outer periphery . The inner peripheral leaf spring portion (10) is engaged with the concave portion (3) of the corrugated pipe (1). In addition, the outer peripheral leaf spring portion (10) also provides a connection structure for the corrugated pipe (1) in which a locking ring (9) engaging with the annular concave groove (6) of the collar member (4) is interposed. I do.
[0005]
[Action]
The outer peripheral leaf spring portion (10) of the locking ring (9) having an S-shaped cross section engages the annular concave groove (6) of the collar member (4) by elastic deformation, and the inner peripheral leaf spring portion (10) is The corrugated tube (1) inserted into the collar member (4) engages with the concave portion (3) between the convex portions (2) by elastic deformation.
Therefore, the corrugated pipe (1) is inserted without being pulled out from the collar member (4). The inner and outer peripheral leaf spring portions (10, 10) of the locking ring (9) project between the annular concave groove (6) of the collar member (4) and the concave portion (3) of the corrugated pipe (1). As a result, the locking ring (9) does not rattle between the collar member (4) and the corrugated pipe (1).
[0006]
【Example】
The present invention will be described with reference to one embodiment shown in FIGS. 1 and 2. In the corrugated pipe (1), convex portions (2) and concave portions (3) are alternately formed on the outer periphery, and the collar member (4) is formed. ) Is cylindrical and the left and right end openings (5, 5) are expanded in a bell mouth shape, and a pair of left and right annular concave grooves (6, 6) are formed in the center of the inner periphery, and on the outer periphery thereof A convex ring (7, 7) is formed correspondingly, and a plurality of ribs (8, 8) are formed outside the convex ring (7, 7) for reinforcement.
A locking ring (9) is attached to the first concave portion (3) from the insertion end of the tube (1). The locking ring (9) is a C-ring having an S-shaped cross section, and is provided with leaf spring portions (10, 10) on the outer periphery and the inner periphery. Further, a rubber ring (11) is attached to the second concave portion (3) from the insertion end of the tube (1).
[0007]
Such a tube (1,1) is inserted through the left and right openings (5,5) of the collar member (4). Since the diameter of the openings (5, 5) is increased in a bell-mouth shape, the positioning of the tubes (1, 1) when inserting them becomes easy. The locking ring (9) in the open state (natural state) is also guided by the bell-mouth-shaped openings (5, 5) and smoothly elastically deforms in the closing direction.
When the tube (1,1) is inserted into the collar member (4), the locking ring (9) resiliently opens at the position of the annular groove (6,6) of the collar member (4). And the inner and outer peripheral leaf spring portions (10, 10) of the locking ring (9) are elastically restored in the opening direction, and the outer peripheral leaf spring portion (10) is restored to the collar member (4). The inner peripheral leaf spring portion (10) engages with the concave portion (3) of the tube (1).
[0008]
In this state, the inner and outer peripheral leaf spring portions (10, 10) of the locking ring (9) project between the annular concave groove (6) of the collar member (4) and the concave portion (3) of the pipe (1). The inner circumference of the annular groove (6) of the collar member (4) and the outer circumference of the recess (3) of the corrugated pipe (1) are in pressure contact with each other. Do the retaining. And the rubber ring (11) maintains the airtightness between the collar member (4) and the pipe (1).
[0009]
In addition to the present embodiment, as shown in FIG. 3, the reinforcing ribs (8) of the convex ring portion (7) of the collar member (4) may be provided on both the inside and outside of the convex ring portion (7). Further, the collar member (4) of the present invention may be provided at an end of one corrugated pipe (1) other than the one used for connecting the pair of pipes (1, 1), or may be provided with a manhole. Etc. may be attached to the cable inlet.
[0010]
【The invention's effect】
According to the present invention, the collar and the corrugated pipe can be reliably prevented from coming off and connected.
[Brief description of the drawings]
1 and 2 show an embodiment of the present invention.
FIG. 1 is an exploded perspective view of a connecting portion; FIG. 2 is a cross-sectional side view of the connecting portion; FIG. 3 is a side view of another embodiment of a collar member; FIG.
FIG. 4 is an exploded perspective view of a connecting portion. FIG. 5 is a sectional side view of a connecting portion.
1 Corrugated pipe
2 convex
3 recess
4 Color members
5 Opening
6 Annular groove
9 Lock ring
10 Leaf spring part

Claims (2)

An annular concave groove is provided at a predetermined position on the inner periphery of the collar member, and a concave portion at a predetermined position of the corrugated tube inserted into the collar member and the annular concave groove of the collar member are combined, and a S-shaped cross section is provided therebetween , A leaf spring portion is provided on the inner periphery and the outer periphery. The inner peripheral leaf spring portion engages with the concave portion of the corrugated pipe, and the outer peripheral leaf spring portion engages with the annular concave groove of the collar member. Corrugated pipe connection structure characterized by interposition of a ring The collar member has openings at both left and right ends, and a pair of left and right annular concave grooves are further provided.A pair of corrugated pipes are inserted from the left and right openings of the collar member, and a predetermined portion of the pair of corrugated pipes is inserted. The concave portion and the annular concave groove of the collar member are respectively fitted, and have an S-shaped cross section therebetween, and a leaf spring portion is provided on the inner periphery and the outer periphery, and the inner peripheral leaf spring portion is formed by a concave portion of the corrugated pipe. 2. The connecting structure for a corrugated pipe according to claim 1, wherein the outer peripheral leaf spring portion is interposed with a locking ring which engages with an annular concave groove of the collar member.

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