Patent ID: 6824172
Filing Date: 2004-11-30
Classification: F16L

Abstract:
A push-pull pipe coupling adapted for interconnecting a pair of pipe sections, said pipe coupling comprising:a hollow connector having an internal chamber within which is adapted to be located a pipe section, surrounding the pipe section is a coupler, said coupler including a grab ring housing which is annular in configuration and is located about the pipe section, said grab ring housing having an interior surface that is formed into an annular concavity; said coupler including a grab ring mounted within said concavity, said grab ring having a cylindrical main body which has a plurality of inwardly extending biting members, said cylindrical main body being mounted within said annular concavity, said biting members adapted to abut against the pipe section; whereby said biting members are acute angularly disposed relative to the pipe section and upon movement in a withdrawing direction of the pipe section from said internal chamber said biting members are cause to pivot to a smaller acute angle and dig into the pipe section forming a securement between the connector and the pipe section; and said annular concavity having a forward wall which is located at an acute angle that is less than the acute angle of said biting members prior to the withdrawing movement of the pipe section.