초록 ▼

A coupling for a pipe lap joint is disclosed in which a sleeve has a larger diameter at one end and a smaller diameter at the other end with means for stretching the sleeve around the pipes. The sleeve has a radially projecting channel-shaped sector and force applying means engages the sector to str

A coupling for a pipe lap joint is disclosed in which a sleeve has a larger diameter at one end and a smaller diameter at the other end with means for stretching the sleeve around the pipes. The sleeve has a radially projecting channel-shaped sector and force applying means engages the sector to stretch the sleeve around the pipes. The channel-shape sector is uniform in cross section along the length of the sleeve and the larger end of the sleeve is axially offset from the smaller end. An improved method for making the pipe coupling is disclosed in which a sleeve blank is disposed in an external die and stretched outwardly by an expanding mandrel.

대표청구항 ▼

In a pipe coupling of the type comprising a sleeve adapted to receive a pipe of one diameter inside one end and a pipe of a larger diameter inside the other end with the pipes being in telescoping relation to form a lap joint; said sleeve having a cross section including a roundish sector and a radi

In a pipe coupling of the type comprising a sleeve adapted to receive a pipe of one diameter inside one end and a pipe of a larger diameter inside the other end with the pipes being in telescoping relation to form a lap joint; said sleeve having a cross section including a roundish sector and a radially projecting channel-shaped sector, force applying means connected with the channel-shaped sector and adapted to act on the sleeve for deforming the sleeve to change the cross sectional dimensions thereof, the improvement wherein said sleeve is a unitary piece of sheet metal, the roundish sector of said sleeve comprises first and second end bands, the first end band being of larger circumference than the second end band and having a thinner wall than the second end band in at least a portion thereof diametrically opposite the channel-shaped sector, whereby said sleeve receives said pipes in loose fitting relation with about the same clearance at both ends and actuation of the force applying means stretches said sleeve around said pipes.