Pipe couplings

Claim 2

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, said member having an annular recess adjacent the threads and intermediate the ends thereof, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar to be sprung into said annular recess whereby the collar is in removable sprung engagement with the threaded end of the threaded member.

Claim 3

A pipe coupling as claimed in claim 1, the collar and the sealing device having oppositely radially extending portions thereon that engage one behind the other releasably to retain the collar and the sealing device together, and the collar and the threaded member having oppositely radially extending portions thereon that engage one behind the other releasably to retain the collar and the threaded member together.

Claim 4

A pipe coupling as claimed in claim 1, the threaded member being a nut which is internally threaded for engagement with the body, the collar being so dimensioned that it is an interference fit with the threads of the nut but can nevertheless be passed through the threaded portion of the nut by radial contraction of the split collar into said annular recess of the nut where the collar expands again and is retained.

Claim 5

A pipe coupling as claimed in claim 1, the taper on said split collar being disposed adjacent the end of the threaded member at the back of said annular recess into which the split collar is sprung for removable attachment thereof.

Claim 6

A pipe coupling as claimed in claim 1, said split collar snapping inside the adjacent end of said sealing device for the removable attachment thereof, said split collar having a peripheral external lip adjacent the end remoTe from said member and said sealing device having an internal recess which is engaged by said lip when the collar and sealing device are sprung into engagement thereby utilizing the natural resilience and radial compressibility of the collar.

Claim 7

A pipe coupling as claimed in claim 5, said sealing device comprising a nonmetallic sealing member which seals against said body and a metallic seal carrier by which the sealing member is carried, said carrier and said split collar being removably sprung into engagement with each other.

Claim 8

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar and the threaded member to be removably sprung into engagement with each other, the threaded member being a nut which is internally threaded for engagement with the body and has an internal rebated portion adjacent the inner end of the internally threaded portion, the collar being so dimensioned that it is an interference fit with the threads of the nut but can nevertheless be passed through the threaded portion of the nut by radial contraction of the split collar into the rebated portion of the nut where the collar expands again and is retained.

Claim 9

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar and the threaded member to be removably sprung into engagement with each other, the threaded member being a nut which is internally threaded for engagement with the body and has an internal rebated portion adjacent the inner end of the internally threaded portion, the collar being so dimensioned that it is an interference fit with the threads of the nut but can nevertheless be passed through the threaded portion of the nut by radial contraction of the split collar into the rebated portion of the nut where the collar expands again and is retained.

Claim 10

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar and the threaded member to be removably sprung into engagement with each other, said sealing device comprising a nonmetallic sealing member and a nonsplit carrier by which the sealing member is attached to the split collar.

Claim 11

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar and the threaded member to be removably sprung into engagement with each other, said sealing device comprising a nonmetallic sealing member and a nonsplit carrier by which the sealing member is attached to the split collar.

Claim 12

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bore to receive the extremity of the pipe, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar and the threaded member to be removably sprung into engagement with each other, said sealing device having a nonmetallic elastic deformable portion and a positive abutment surface for engagement with the body to limit the compression of said elastic deformable portion and thereby avoid overloading it.

Claim 13

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bore to receive the extremity of the pipe, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar and the threaded member to be removably sprung into engagement with each other, said sealing device having a nonmetallic elastic deformable portion and a positive abutment surface for engagement with the body to limit the compression of said elastic deformable portion and thereby avoid overloading it.

Claim 14

A pipe coupling as claimed in claim 9, said abutment surface being a surface of a nonsplit metallic carrier.

Claim 15

A pipe coupling as claimed in claim 10, said elastic deformable portion having a radially outwardly extending portion that engages behind a radially inwardly extending portion of said nonsplit metallic carrier to retain said nonsplit metallic carrier and said elastic deformable portion together.

Claim 16

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar and the threaded member to be removably sprung into engagement with each other, the taper on said split collar being disposed adjacent the end of the threaded member at the back of an internal annular end recess into which the split collar is sprung for removable attachment thereof.

Claim 17

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar and the threaded member to be removably sprung into engagement with each other, the taper on said split collar being disposed adjacent the end of the threaded member at the back of an internal annular end recess into which the split collar is sprung for removable attachment thereof.

Claim 18

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar to be removably sprung into engagement with the threaded end of the threaded member, said split collar snapping inside the adjacent end of said sealing device for the removable attachment thereof, said split collar having a peripheral external lip adjacent the end remote from said member and said sealing device having an internal recess which is engaged by said lip when the collar and sealing device are sprung into engagement thereby utilizing the natural resilience and radial compressibility of the collar.

Claim 19

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device to effect sealing engagement between the pipe and the body, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar to be removably sprung into engagement with the threaded end of the threaded member, said split collar snapping inside the adjacent end of said sealing device for the removable attachment thereof, said split collar having a peripheral external lip adjacent the end remote from said member and said sealing device having an internal recess which is engaged by said lip when the collar and sealing device are sprung into engagement thereby utilizing the natural resilience and radial compressibility of the collar.

Claim 20

A pipe coupling as claimed in claim 13, said sealing device comprising a nonmetallic sealing member which seals against said body and a metallic seal carrier by which the sealing member is carried, said carrier and said split collar being removably sprung into engagement with each other.

Claim 21

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, said member having an annular recess adjacent the threads thereof, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device comprising a nonmetallic sealing member to effect sealing engagement between the pipe and the body and a nonsplit carrier by which the sealing member is attached to the split collar, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, and the split of the collar permitting the nonsplit carrier oF the sealing device and the split collar to be removably sprung into engagement with each other and permitting the split collar to be sprung into said annular recess whereby the collar and the threaded member are removably sprung into engagement with each other.

Claim 22

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, said member having an annular recess adjacent the threads thereof, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device comprising a nonmetallic sealing member to effect sealing engagement between the pipe and the body and a nonsplit carrier by which the sealing member is attached to the split collar, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, and the split of the collar permitting the nonsplit carrier oF the sealing device and the split collar to be removably sprung into engagement with each other and permitting the split collar to be sprung into said annular recess whereby the collar and the threaded member are removably sprung into engagement with each other.

Claim 23

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, said member having an annular recess adjacent the threads thereof, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device having a nonmetallic elastic deformable portion to effect sealing engagement between the pipe and the body and also having a positive abutment surface for engagement with the body to limit the compression of said elastic deformable portion and thereby avoid overloading it, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar to be sprung into said annular recess whereby the collar and the threaded member are removably sprung into engagement with each other.

Claim 24

A pipe coupling comprising a screw-threaded member to surround the pipe and in threaded engagement with a body bored to receive the extremity of the pipe, said member having an annular recess adjacent the threads thereof, a tapered split collar in engagement with a corresponding taper on an inner surface of the threaded member to permit contraction of the collar into gripping engagement with the pipe, and a separate nonsplit sealing device having a nonmetallic elastic deformable portion to effect sealing engagement between the pipe and the body and also having a positive abutment surface for engagement with the body to limit the compression of said elastic deformable portion and thereby avoid overloading it, the sealing device being pressed into engagement between the pipe and the body, the threaded member and the collar and the sealing device being detachably interconnected against axial separation from each other, the split of the collar permitting the sealing device and split collar to be removably sprung into engagement with each other and permitting the split collar to be sprung into said annular recess whereby the collar and the threaded member are removably sprung into engagement with each other.

Claim 25

A pipe coupling as claimed in claim 16, said abutment surface being a surface of a nonsplit metallic carrier.

Claim 26

A pipe coupling as claimed in claim 17, said elastic deformable portion having a radially outwardly extending portion that engages behind a radially inwardly extending portion of said nonsplit metallic carrier to retain said nonsplit metallic carrier and said elastic deformable portion together.