초록 ▼

A joint for pipes in which externally threaded male members are screwed into an internally threaded sleeve. The ends of the male members have sealing surfaces thereon and are substantially cylindrical and thread-free. The ends are so formed that upon abutment they will be urged radially outwardly. T

A joint for pipes in which externally threaded male members are screwed into an internally threaded sleeve. The ends of the male members have sealing surfaces thereon and are substantially cylindrical and thread-free. The ends are so formed that upon abutment they will be urged radially outwardly. The threaded sleeve has a substantially thread-free cylindrical sealing surface intermediate its ends. When the male members are screwed into the sleeve the ends abut causing the sealing surfaces of the male members to be forced radially outwardly into tighter sealing engagement with the sealing surface of the sleeve.

대표청구항 ▼

A pipe joint structure comprising: externally threaded male members and an internally threaded coupling sleeve, said coupling sleeve threadedly engaging said male members, said sleeve having a substantially cylindrical internal seal surface located between the threads thereon, each of said male memb

A pipe joint structure comprising: externally threaded male members and an internally threaded coupling sleeve, said coupling sleeve threadedly engaging said male members, said sleeve having a substantially cylindrical internal seal surface located between the threads thereon, each of said male members having a thread-free end portion with a substantially cylindrical external seal surface that before make-up has an outer diameter at least equal to the inner diameter of said internal seal surface on said sleeve and which engages said internal seal surface when said joint is made up, said male members having tip regions at the outer peripheries of their said end portions that provide first contact between said end portions as said joint is made up and then tend to move radially outward as said joint is tightened to provide fluid tight sealing engagement of said external seal surfaces with said internal seal surface, said end portions having surface means on the front faces thereof adjacent said tip regions that are shaped to provide a space that increases in size toward the center of said joint prior to make-up and decreases in size during make-up.