Pipe coupling

Claim 2

Coupling means comprising a hollow body, a support collar mounted on the body so as to be axially slidable thereon, means for preventing rotation of the collar relative to the body, a plurality of hooked arms mounted on the collar and at least one of which is pivotable relative thereto, the arms being adapted to engage behind a flange on a hollow member whereby the member can be clamped against the body, a thrust member mounted on the hollow body in contact with the collar and in screw-threaded engagement with the body, whereby rotation of the thrust member relative to the body causes axial movement of the collar along the body to effect said clamping, and means for locking the collar and thrust member together comprising a pin slidably mounted on the collar so as to be movable axially thereof and having a part arranged to engage a flange formed on the thrust member, means for axially displacing the pin whereby the said part frictionally engages the flange.

Claim 3

Coupling means according to claim 1, wherein each pivoted hooked arm is formed with a shoulder adapted to engage the flange of the thrust member when the hooked arm is in its operative position whereby the said arm is locked against pivotal movement, the flange being formed with a recess which aligns with the shoulder to permit pivotal movement of the hooked arm when the thrust member is in its inoperative position.

Claim 4

Coupling means according to claim 1, wherein the means for axially displacing the pin comprises face cam means operatively connected to said pin, said cam means having relatively rotatable portions for axially displacing the pin whereby the said part frictionally engages the flange, and means for relatively rotating the portions of the face cam.

Claim 5

Coupling means according to claim 3, wherein each pivoted hooked arm is formed with a shoulder adapted to engage the flange of the thrust member when the hooked arm is in its operative position whereby the said arm is locked against pivotal movement, the flange being formed with a recess which aligns with the shoulder to permit pivotal movement of the hooked arm when the thrust member is in its inoperative position.

Claim 6

Coupling means comprising a hollow body having a cylindrical portion, a support collar mounted on the cylindrical portion of the body so as to be axially slidable thereon, means for preventing rotation of the collar relative to the body, a plurality of hooked arms mounted on the collar and at least one of which is pivotable relative thereto, the arms being adapted to engage behind a flange on a hollow member whereby the member can be clamped against the body, an annular thrust member mounted on the cylindrical portion of the hollow body in contact with the collar and in screw-threaded engagement with the body, whereby rotation of the thrust member relative to the body in one direction causes axial movement of the collar along the body to effect said clamping, an annular flange being formed on the thrust member and each pivoted hooked arm being formed with a shoulder adapted to engage the flange of the thrust member when the hooked arm is in its operative position whereby the said arm is locked against pivotal movement, the flange being formed with a recess which aligns with the shoulder to permit pivotal movement of the hooked arm when the thrust member is in its inoperative position and means for locking the collar and thrust member together comprising a pin slidably mounted on the collar so as to be movable axially thereof and having a head arranged to engage the said flange on the thrust member, face cam means having relatively rotatable portions one of which portions is secured to the pin and the other of which portions is fixedly mounted on the collar, and lever means for relatively rotating the portions of the face cam to displace the pin axially to engage the head thereof frictionally with the flange on the thrust member.

Claim 7

Coupling means comprising a hollow body having a cylindrical portion, a support collar mounted on the cylindrical portion of the body so as to be axially slidable thereon, means for preventing rotation of the collar relative to the body, a plurality of hooked arms mounted on the collar and at least one of which is pivotable relative thereto, the arms being adapted to engage behind a flange on a hollow member whereby the member can be clamped against the body, an annular thrust member mounted on the cylindrical portion of the hollow body in contact with the collar and in screw-threaded engagement with the body, whereby rotation of the thrust member relative to the body in one direction causes axial movement of the collar along the body to effect said clamping, an annular flange being formed on the thrust member and each pivoted hooked arm being formed with a shoulder adapted to engage the flange of the thrust member when the hooked arm is in its operative position whereby the said arm is locked against pivotal movement, the flange being formed with a recess which aligns with the shoulder to permit pivotal movement of the hooked arm when the thrust member is in its inoperative position and means for locking the collar and thrust member together comprising a pin slidably mounted on the collar so as to be movable axially thereof and having a head arranged to engage the said flange on the thrust member, face cam means having relatively rotatable portions one of which portions is secured to the pin and the other of which portions is fixedly mounted on the collar, and lever means for relatively rotating the portions of the face cam to displace the pin axially to engage the head thereof frictionally with the flange on the thrust member.