Pipe joint

Claim 2

A pipe joint, comprising: a metal pipe having an unthreaded end; a metal body member having a tubular socket for receiving said unthreaded end of said metal pipe, said tubular socket having an internal shoulder at its inner end and an annular, resilient, compressible packing ring seated on said shoulder and sealingly engaged with said one of said metal pipe, said tubular socket being defined by an annular axially extending flange projecting away from said shoulder and encircling said end of said pipe, said flange having a threaded portion on its external wall, the internal wall of said flange consisting of an axially outer portion wHich tapers in a direction from the axially outer end of said flange partway toward said shoulder and an axially inner portion which extends from the inner end of said outer portion to said shoulder, said axially inner portion of said internal wall being of substantially uniform diameter throughout its length and being disposed in surrounding and radially outwardly spaced relationship to said pipe; a metal nut sleeved on said pipe and having a threaded first internal wall portion threadedly engaged with said threaded portion of said flange and a tapered second internal wall portion spaced axially outwardly from said first internal wall portion and tapering in an axially outward direction; a thin-wall, flat, metal packing sleeve surrounding said pipe and having the opposite end portions of its external surface in surface-to-surface contact with said tapered second internal wall portion of said nut and said tapered axially outer portion of the internal wall of said flange, said sleeve being concavo-convex in axial cross-section and having its opposite axial ends plastically deformed and pressed against the exterior surface of the pipe along two axially spaced circumferentially extending lines of contact with the interior surface of said pipe being free from internal support at said lines of contact, other portions of said sleeve being elastically deformed so that the sleeve can elastically spring back when said nut is unthreaded from said body member, the inner axial end of said sleeve extending inwardly beyond the inner end of said axially outer portion of the internal wall of said flange and into the space between said axially inner portion of the internal wall of said flange and said pipe, the edge of said inner axial end of said sleeve biting into and forming an annular groove in the exterior surface of said pipe.

Claim 3

A pipe joint as claimed in claim 1, in which said body member has two corresponding sockets projecting in opposite axial directions from said shoulder, there being a pipe, a nut and a sleeve associated with each socket.

Claim 4

A pipe joint, as claimed in claim 1, in which said pipe, said body member and said nut are made of the same metal.

Claim 5

A pipe joint, comprising: a metal pipe having an unthreaded end; a metal body member having a tubular socket for receiving said unthreaded end of said metal pipe, said tubular socket having an internal shoulder at its inner end, said tubular socket being defined by an annular axially extending flange projecting away from said shoulder and encircling said end of said pipe, said flange having a radially extending end wall at the outer axial end thereof and a threaded portion on its external wall, the internal wall of said flange consisting of an elongated axially outer portion of substantially the same length as said threaded portion of said external wall and which extends from said radial end wall and tapers at a small angle in a direction from said end wall of said flange partway toward said shoulder and an axially inner portion which extends from the inner end of said outer portion to said shoulder, said axially inner portion of said internal wall being of substantially uniform diameter throughout its length and surrounding said pipe; a metal nut sleeved on said pipe and having a threaded first internal wall portion threadedly engaged with said threaded portion of said flange, an elongated tapered second internal wall portion spaced axially outwardly from said first internal wall portion and tapering at a small angle in an axially outward direction, and a radially extending intermediate wall portion extending between the adjacent ends of said first and second internal wall portions and which is in confronting relationship to the radial end wall on said body member; a thin-wall, flat, metal packing sleeve surrounding said pipe, disposed radially inwardly of said intermediate wall portion and said end wall and having its external surface in surface-to-surface contact with said tapered second internal wall portion of said nut and said tapered axially outer portion of the internal wall of said flange along substantially the entire lengths thereof, said sleeve being concavo-convex in axial cross-section and having its opposite axial ends plastically deformed and pressed against the exterior surface of the pipe along two axially spaced circumferentially extending lines of contact with the interior surface of said pipe being free from internal support at said lines of contact, other portions of said sleeve being elastically deformed so that the sleeve can elastically spring back when the load applied thereon is removed, at least one of the axial ends of said sleeve biting into and forming an annular groove in the exterior surface of said pipe.

Claim 6

A pipe joint, comprising: a metal pipe having an unthreaded end; a metal body member having a tubular socket for receiving said unthreaded end of said metal pipe, said tubular socket having an internal shoulder at its inner end, said tubular socket being defined by an annular axially extending flange projecting away from said shoulder and encircling said end of said pipe, said flange having a radially extending end wall at the outer axial end thereof and a threaded portion on its external wall, the internal wall of said flange consisting of an elongated axially outer portion of substantially the same length as said threaded portion of said external wall and which extends from said radial end wall and tapers at a small angle in a direction from said end wall of said flange partway toward said shoulder and an axially inner portion which extends from the inner end of said outer portion to said shoulder, said axially inner portion of said internal wall being of substantially uniform diameter throughout its length and surrounding said pipe; a metal nut sleeved on said pipe and having a threaded first internal wall portion threadedly engaged with said threaded portion of said flange, an elongated tapered second internal wall portion spaced axially outwardly from said first internal wall portion and tapering at a small angle in an axially outward direction, and a radially extending intermediate wall portion extending between the adjacent ends of said first and second internal wall portions and which is in confronting relationship to the radial end wall on said body member; a thin-wall, flat, metal packing sleeve surrounding said pipe, disposed radially inwardly of said intermediate wall portion and said end wall and having its external surface in surface-to-surface contact with said tapered second internal wall portion of said nut and said tapered axially outer portion of the internal wall of said flange along substantially the entire lengths thereof, said sleeve being concavo-convex in axial cross-section and having its opposite axial ends plastically deformed and pressed against the exterior surface of the pipe along two axially spaced circumferentially extending lines of contact with the interior surface of said pipe being free from internal support at said lines of contact, other portions of said sleeve being elastically deformed so that the sleeve can elastically spring back when the load applied thereon is removed, at least one of the axial ends of said sleeve biting into and forming an annular groove in the exterior surface of said pipe.

Claim 7

A pipe joint as claimed in claim 4 including an annular, resilient, compressible packing ring of rectangular cross-section seated on said shoulder and sealingly engaged with said end of said metal pipe, said ring being of greater radial thickness than said pipe and extending both radially outwardly and radially inwardly from said pipe, and said end of said pipe forms an annular groove in the confronting end wall of said packing ring.