Flexible pipe joint system

A flexible pipe joint system has three swivel joints on the both sides and in the central portion thereof, and two arm pipes connecting the swivel joints. The swivel joints have a stepped cylinder body, an elbow and a cap nut. The stepped cylinder body has a larger diameter portion and a smaller diameter portion. The elbow has a pipe connection portion to which a nipple provided with a flange on its outer end and a nut member on its outer periphery. A short cylindrical adapter is provided at one end of the arm pipe connected to the pipe connection portion of the elbow and to one end of the arm pipe connected to the smaller diameter portion of the cylinder body. The adapter and the nut member, respectively, have an outer diameter smaller than the inner diameter of the gasket and an inner diameter of an end portion of the cap nut.

What is claimed is:

1. A flexible pipe joint system having a first swivel joint on one side thereof, a second swivel joint on opposite side thereof and a third swivel joint substantially in a center thereof, and a first arm pipe connecting the first and third swivel joints and a second arm pipe connecting the second and third swivel joints, said first, second and third swivel joints each having a stepped cylinder body, an elbow and a cap nut, each stepped cylinder body having a larger diameter portion and a smaller diameter portion, each elbow having on one end thereof a ball portion with a spherical surface and a pipe connection portion on another end thereof, said larger diameter portion of the cylinder body receiving therein said ball portion of the elbow and having fitted therein a gasket which is pressed against the spherical surface of the ball portion, said cap nut being threadedly engaged with said large diameter portion of said cylinder body so as to retain said ball portion and said gasket in said large diameter portion, wherein said pipe connection portion of the elbow of said first swivel joint and said pipe connection portion of the elbow of said second swivel joint each having attached thereto a nipple, said nipple having a flange on its outer end and also having moveably fitted thereto a nut member on its outer periphery, one end of said first arm pipe being connected to said pipe connection portion of the elbow of said third swivel joint and one end of said second arm pipe being connected to said smaller diameter portion of said cylinder body of said third swivel joint, the other ends of said first and second arm pipes each having attached thereto a short cylindrical adapter having threads on outer surface thereof, said nut member being detachably threadedly engaged with the adapter, said adapter and said nut member each having an outer diameter smaller than the inner diameter of said gasket and an inner diameter of an end portion of said cap nut such that said gasket can be easily exchanged.

2. The flexible pipe joint system as claimed in claim 1, wherein said system comprises means for applying force to urge said elbow outward so that said spherical surface of the ball portion can be pressed against said inner surface having an arcuate cross section.

3. The flexible pipe joint system as claimed in claim 1, further comprising an inlet pipe adapted to be connected to a fluid source and an outlet pipe adapted to be connected to a mobile acting member.

4. The flexible pipe joint system as claimed in claim 1, wherein said adapter is of a stepped cylindrical form and has a larger diameter portion and a smaller diameter portion, said smaller diameter portion of said adapter having embedded therein an O-ring.