Patent ID: 7963569

Claim:
A novel locking pipe joint comprising a pair of pipes, a coupler, a number of sealing rings and a number of splines, wherein each of said pair of pipes further comprises: a. a number of longitudinal ribs on its outside surface, b. a first chamfer at its jointed end, the jointed end being the end of the pipe that is inserted into said coupler, c. a number of first grooves, wherein each of said number of first grooves is provided to house one of said number of splines, wherein said coupler comprises on its inside surface: d. a number of second grooves, wherein each number of second grooves is provided to house one of said number of sealing rings, e. a number of longitudinal grooves; wherein each of said number of longitudinal grooves corresponds to one of said number of longitudinal ribs, f. a pair of second chamfers, each of said pair of second chamfers fitting snugly against said first chamfer of one of said pair of pipes; wherein the two second chamfers together form a section of reduced diameter inside said coupler; and g. a number of third grooves, the number of said third grooves for each of said pair of pipes being a same as the number of said first grooves for the pipe, and each of said number of third grooves being positioned respectively with the position of each of said number of first grooves such that each first groove and the corresponding third groove together form a corresponding spline passage, thereby forming a number of spline passages; and h. corresponding to each of said number of third grooves, a number of pairs of tangential holes; said holes being made in the coupler wall and positioned near each other, and wherein one of said number of sealing rings is placed in each of said sealing ring grooves, so that all second grooves are fitted with a sealing ring, and whereafter each of said pair of pipes is placed inside said coupler from either end of said coupler such that each of said number of longitudinal ribs fits inside one of corresponding said number of longitudinal grooves, and whereby each of said number of sealing ring gets compressed inside a corresponding second groove, and further whereby said first chamfer for each of said pair of pipes rests on corresponding said second chamfer; and wherein said tangential holes are made in the wall of said coupler such that each said tangential hole opens into a spline passage; the number of said pairs of tangential holes being the same as the number of spline passages; and wherein each of said number of splines is inserted into one hole of each of said plurality of pairs tangential holes, the spline further entering into the corresponding spline passage and coming out of the other hole of the corresponding pair of tangential holes; both loose ends of the spine being twined together forming a secure tie; said secure tie being formed at each of said plurality of spline passages using one of said plurality of splines; and whereby a leak-proof and secure locking pipe joint is formed.