Patent ID: 9599258
Date: 2017-03-21
CPC Classifications: F16L

Claim:
1. A mechanical pipe joint for connecting a first pipe section and a second pipe section, comprising: a pin on an end of said first pipe section and a socket on an end of said second pipe section into which said pin is inserted by application of a hydraulic force; said socket including a cylindrical socket section having an inside diameter less than an outside diameter of said pin to form an interference fit with said pin when said pin is inserted into said socket and an outwardly extending tapered socket section for connecting said cylindrical socket section to said second pipe section; said pin including a cylindrical pin section, a formed pin section on an outside wall surface thereof having a contact taper segment with an angle of taper less than an angle of taper of said outwardly extending tapered socket section of said socket which contacts an inside wall of said outwardly extending tapered socket section of said socket when said pin is inserted in said socket, and a cavity segment; an annular cavity defined between said outwardly extending tapered socket section of said socket, a portion of said cylindrical socket section of said socket, and said formed pin section of said pin, in which a sealant is trapped to seal said mechanical pipe joint when said contact taper segment of said formed pin section of said pin is engaged by said application of the hydraulic force into contact with said inside wall of said outwardly extending tapered socket section of said socket; and wherein one of: (a) said cavity segment of said outside wall surface of said formed pin section of said pin is a tapered surface having an angle of taper less than the angle of said contact taper segment, (b) said cavity segment of said outside wall surface of said formed pin section of said pin is a tapering surface with an adjoining triangular annular cavity to facilitate hardening of said sealant trapped in said annular cavity, or (c) said cavity segment of said outside wall surface of said formed pin section of said pin is an inwardly recessed surface parallel to said cylindrical pin section of said pin.