Patent ID: 6786517
Filing Date: 2004-09-07
Classification: F16L

Abstract:
A concentric pipe joint constraint, said restraint resisting axial movement of a spigot pipe relative to a socket pipe within which a portion of said spigot pipe has been inserted, said spigot pipe and said socket pipe defining an annulus, said restraint comprising:a spigot wedge ring comprising one or more spigot gripping protrusions; socket wedge ring comprising one or more socket gripping protrusions; a wedge housing positioning said spigot wedge ring relative to said socket wedge ring with which it is in effective contact in said annulus such that said spigot gripping protrusions grip said spigot pipe and said socket gripping protrusions grip said socket pipe; wherein said spigot wedge ring further comprises a frusto-conical surface; said socket wedge ring further comprises an opposed frusto-conical surface in effective contact with said frusto-conical surface; the gripping protrusions are biased to prevent axial separation of the pipes; the frusto-conical surfaces are biased to prevent axial separation of the pipes; and an actuator driving said gripping protrusions into said pipes by imparting axial movement of said wedge rings relative to one another, said axial movement imparting sliding axio-radial movement of said frusto-conical surfaces relative to one another.