Pipe coupling

Claim 2

A pipe coupling producing a tight seal and a firm clamping action when applied to a pipe, comprising: A. a collar formed with an internal screw-threaded portion adjacent to an open end thereof, and with an internal annular shoulder between said screw-threaded portion and the opposite end of the collar; B. a sleeve having a leading portion receivable within the collar and formed with external screw-threads cooperable with the internal screw-threads of the collar, said sleeve also having a manipulatable trailing portion to be disposed external to the collar to enable screwing the leading portion of the sleeve into the collar, at least the leading portion of the sleeve being axially split to permit the radial contraction thereof and being formed on its inner surface with inwardly directed protrusions; C. and a resilient sealing ring of a diameter to be loosely received around the pipe and to be disposed between said internal shoulder of the collar and the end face of the leading portion of the sleeve when the latter is threaded into the collar; the screw-threads of the collar and sleeve being formed in cylindrical surfaces of substantially uniform diameter throughout the length of their respective screw-threaded portions and having a sloping back face facing the trailing portion of the sleeve and said open end of the collar, respectively, such that when the pipe is disposed within the collar and the sleeve, with the screw-threads of the leading portion of the sleeve interengaging those of the collar and the manipulatable trailing portion of the sleeve projecting from the collar, and with the sealing ring interposed between the internal shoulder of the collar and said end face of the sleeve, rotating the sleeve by means of its manipulatable trailing portion to displace the sleeve axially of the collar; i. first effects the seal by causing the said end face of the sleeve to apply an axial force to the sealing ring to axially compress it and thereby to radially expand it into sealing engagement with the pipe and collar; ii. and then, by virtue of the sealing ring and shoulder thereafter serving as an abutment limiting the further axial displacement of the sleeve within the collar, causes the sloping faces of their interengaging screw-threads to effect the radial contraction of the threaded portion of the sleeve for the complete length of the interengaging threads to force the sleeve protrusions into the pipe throughout the length of the said interengaging threads.

Claim 3

The pipe coupling as defined in claim 1, further including an annular pressure ring received between the sealing ring and said end face of the sleeve to bridge the split in the sleeve and to transfer the axial force from the latter to the sealing ring uniformly about the complete annular surface of the sealing ring.

Claim 4

The pipe coupling as defined in claim 1, wherein the sleeve is axially split through both its leading and trailing portions, and is formed of a one-piece plastics unit.

Claim 5

The pipe coupling as defined in claim 1, wherein the collar is formed with a second internal annular shoulder of smaller internal diameter than the first-mentioned shoulder between it and said opposite end of the collar for engaging the end of the pipe when inserted therein.

Claim 6

The pipe clamp as defined in claim 1, wherein the manipulatable element on the trailing portion of the sleeve is a manually grippable flange.

Claim 7

The pipe coupling as defined in claim 1, wherein the collar is formed with an inner, axially-extending skirt underlying said annular shoulder and spaced therefrom for receiving the end of the pipe.

Claim 8

A pipe coupling producing a tight seal and a firm clamping action when applied to a pipe, comprising: A. a collar formed with an internal screw-threaded portion adjacent to an open end thereof, and with an internal annular shoulder between said screw-threaded portion and the opposite end of the collar; B. a sleeve having a leading portion receivable within the collar and formed with external screw-threads cooperable with the internal screw-threads of the collar, said sleeve also having a manipulatable flange to be disposed external to the collar to enable screwing the leading portion of the sleeve into the collar, at least the leading portion of the sleeve being axially split to permit the radial contraction thereof and being formed on its inner surface with inwardly directed protrusions; C. a resilient sealing ring of a diameter to be loosely received around the pipe and to be disposed between said internal shoulder of the collar and the end face of the leading portion of the sleeve when the latter is threaded into the collar; and D. an annular pressure ring receivable between the sealing ring and said end face of the leading portion of the sleeve so as to bridge the split therein; the screw threads of the collar and sleeve being formed in cylindrical surfaces of substantially uniform diameter throughout the length of their respective screw-threaded portions and having a sloping back face facing the trailing portion of the sleeve and said open end of the collar, respectively, such that when the pipe is disposed within the collar and the sleeve, with the screw-threads of the leading portion of the sleeve interengaging those of the collar and the manipulatable flange of the sleeve projecting from the collar, and with the sealing ring facing the internal shoulder of the collar and the pressure ring facing said end face of the sleeve, rotating the sleeve by means of its manipulatable flange to displace the sleeve axially of the collar; i. first effects the seal by causing the said end face of the sleeve to apply an axial force via the pressure ring to the sealing ring to axially compress it and thereby to radially expand it into sealing engagement with the pipe and collar; ii. and then, by virtue of the sealing ring, pressure ring, and shoulder thereafter serving as an abutment limiting the further axial displacement of the sleeve within the collar, causes the sloping faces of their interengaging screw-threads to effect the radial contraction of the threaded portion of the sleeve for the complete length of the interengaging threads to clamp the sleeve firmly onto the pipe throughout the length of the said interengaging threads.

Claim 9

A pipe coupling producing a tight seal and a firm clamping action when applied to a pipe, comprising: A. a collar formed with an internal screw-threaded portion adjacent to an open end thereof, and with an internal annular shoulder between said screw-threaded portion and the opposite end of the collar; B. a sleeve having a leading portion receivable within the collar and formed with external screw-threads cooperable with the internal screw-threads of the collar, said sleeve also having a manipulatable flange to be disposed external to the collar to enable screwing the leading portion of the sleeve into the collar, at least the leading portion of the sleeve being axially split to permit the radial contraction thereof and being formed on its inner surface with inwardly directed protrusions; C. a resilient sealing ring of a diameter to be loosely received around the pipe and to be disposed between said internal shoulder of the collar and the end face of the leading portion of the sleeve when the latter is threaded into the collar; and D. an annular pressure ring receivable between the sealing ring and said end face of the leading portion of the sleeve so as to bridge the split therein; the screw threads of the collar and sleeve being formed in cylindrical surfaces of substantially uniform diameter throughout the length of their respective screw-threaded portions and having a sloping back face facing the trailing portion of the sleeve and said open end of the collar, respectively, such that when the pipe is disposed within the collar and the sleeve, with the screw-threads of the leading portion of the sleeve interengaging those of the collar and the manipulatable flange of the sleeve projecting from the collar, and with the sealing ring facing the internal shoulder of the collar and the pressure ring facing said end face of the sleeve, rotating the sleeve by means of its manipulatable flange to displace the sleeve axially of the collar; i. first effects the seal by causing the said end face of the sleeve to apply an axial force via the pressure ring to the sealing ring to axially compress it and thereby to radially expand it into sealing engagement with the pipe and collar; ii. and then, by virtue of the sealing ring, pressure ring, and shoulder thereafter serving as an abutment limiting the further axial displacement of the sleeve within the collar, causes the sloping faces of their interengaging screw-threads to effect the radial contraction of the threaded portion of the sleeve for the complete length of the interengaging threads to clamp the sleeve firmly onto the pipe throughout the length of the said interengaging threads.