Corrugated pipe coupling
Corrugated pipe coupling
A pipe coupling for a corrugated pipe, comprises a pipe coupling main body including a cylindircal portion having a small-diameter through hole, a pipe coupling main cylindrical portion having a large-diameter through hole, a connecting stepped portion formed between the small- and large-diameter through holes and having a circumferential groove, a stopper formed in the connecting stepped portion, for locking an end portion of a corrugated pipe, and stackable plastic container fitted in the circumferential groove, an inner cylinder including a through hole having a diameter substantially equal to an outer diameter of the corrugated pipe and a plastic pallet groove having a tapered surface and formed in an inner wall of a deep portion of the through hole, the inner cylinder being slidably and rotatably fitted in the large-diameter through hole of the pipe coupling main body, and a metal ring arranged in the circumferential groove of the inner cylinder and expandable in a circumferential direction thereof.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pipe coupling used to connect a corrugated pipe.
2. Description of the Related Art
Recently, corrugated pipes which are easy to install have been increasingly used as various types of band materials, such as indoor gas pipe materials, in place of elbows and straight pipes. Under these circumstances, demand has arisen for new pipe couplings for connecting corrugated pipes to other types of pipes. Corrugated pipe have corrugated surfaces and hence are difficult to connect as compared with straight pipes. For this reason, conventional pipe couplings for connecting corrugated pipes inevitably have complicated internal mechanisms.
Since the conventional pipe couplings have complicated connecting mechanisms, they are difficult to handle and are poor in workability.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a pipe coupling which can reliably connect a corrugated pipe, prevents removal of the corrugated pipe and fluid leakage, and allows easy connection/fixing of the corrugated pipe.
A pipe coupling for a corrugated pipe, comprises a pipe coupling main body including a cylindircal portion having a small-diameter through hole, a pipe coupling main cylindrical portion having a large-diameter through hole, a connecting stepped portion formed between the small- and large-diameter through holes and having a circumferential groove, a stopper formed in the connecting stepped portion, for locking an end portion of a corrugated pipe, and stackable plastic container fitted in the circumferential groove, an inner cylinder including a through hole having a diameter substantially equal to an outer diameter of the corrugated pipe and a plastic pallet groove having a tapered surface and formed in an inner wall of a deep portion of the through hole, the inner cylinder being slidably and rotatably fitted in the large-diameter through hole of the pipe coupling main body, and a metal ring arranged in the circumferential groove of the inner cylinder and expandable in a circumferential direction thereof.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pipe coupling used to connect a corrugated pipe.
2. Description of the Related Art
Recently, corrugated pipes which are easy to install have been increasingly used as various types of band materials, such as indoor gas pipe materials, in place of elbows and straight pipes. Under these circumstances, demand has arisen for new pipe couplings for connecting corrugated pipes to other types of pipes. Corrugated pipe have corrugated surfaces and hence are difficult to connect as compared with straight pipes. For this reason, conventional pipe couplings for connecting corrugated pipes inevitably have complicated internal mechanisms.
Since the conventional pipe couplings have complicated connecting mechanisms, they are difficult to handle and are poor in workability.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a pipe coupling which can reliably connect a corrugated pipe, prevents removal of the corrugated pipe and fluid leakage, and allows easy connection/fixing of the corrugated pipe.