Pipe connectors

A pipe connector comprising a tubular pin member having a generally frusto-conical outer peripheral surface having an inner axial end and a free outer axial end and a tubular box member having a generally frusto-conical inner peripheral surface having an inner axial end and a free outer axial end, said generally frusto-conical inner peripheral surface of said tubular box member corresponding to said frusto-conical outer peripheral surface of said pin member and overlying said outer peripheral surface of said pin member when the members are fully engaged together, said frusto-conical surfaces being provided with annular projections and grooves which are inter-engaged when said members are fully engaged together to axially lock said members together, wherein one of said members is provided with an annular projection extending about the inner end of said peripheral surface thereof and projecting in the direction of the free end of said one member, said projection having a first end surface portion which extends in a generally radial plane and a second end surface portion which faces said peripheral surface thereof and which comprises a generally cylindrical surface part, and wherein said free end of said other one of said members has a first end surface portion which extends in a generally radial plane and contacts said first end surface of said projection when said members are fully engaged together and a second end surface portion comprising a generally cylindrical part which faces and laterally contacts said generally cylindrical part of said second end surface portion of said projection when said members are fully engaged together, the diameter of said generally cylindrical part of said second surface portion of said box member being greater than the diameter of said generally cylindrical part of said second surface portion of said pin member such that when said members are fully engaged together there will be a force-fit sealing contact between the cylindrical parts of said second surface portions of said members.

A pipe connector comprising a tubular pin member having a generally frusto-conical outer peripheral surface having an inner axial end and a free outer axial end and a tubular box member having a generally frusto-conical inner peripheral surface having an inner axial end and a free outer axial end, said generally frusto-conical inner peripheral surface of said tubular box member corresponding to said frusto-conical outer peripheral surface of said pin member and overlying said outer peripheral surface of said pin member when the members are fully engaged together, said frusto-conical surfaces being provided with annular projections and grooves which are inter-engaged when said members are fully engaged together to axially lock said members together, wherein one of said members is provided with an annular projection extending about the inner end of said peripheral surface thereof and projecting in the direction of the free end of said one member, said projection having a first annular end surface portion which extends in a generally radial plane and a second annular end surface portion which generally faces said peripheral surface thereof, wherein said free end of the other of said members has a first annular end surface portion which extends in a generally radial plane and contacts said first end surface of said projection when said members are fully engaged together and a second annular end surface portion which faces and laterally contacts said second end surface portion of said projection when said members are fully engaged together, and wherein sealing means are provided for sealing between said members, said sealing means comprising a resiliently compressible annular member arranged in a recess defined between said projection of said one member and said body of said one member and engageable by the free end of said other member when said members are fully engaged together.

A pipe connector comprising a tubular pin member having a generally frusto-conical outer peripheral surface having an inner axial end and a free outer axial end and a tubular box member having a generally frusto-conical inner peripheral surface having an inner axial end and a free outer axial end, said generally frusto-conical inner peripheral surface of said tubular box member corresponding to said frusto-conical outer peripheral surface of said pin member and overlying said outer peripheral surface of said pin member when the members are fully engaged together, said frusto-conical surfaces being provided with annular projections and grooves which are inter-engaged when said members are fully engaged together to axially lock said members together, wherein one of said members is provided with an annular projection surrounding the inner end of said peripheral surface thereof and projecting in the direction of the free end of said one member, said projection having a first annular end surface portion which extends in a generally radial plane and a second annular end surface portion which generally faces said peripheral surface thereof, wherein said free end of the other one of said members has a first annular end surface portion which extends in a generally radial plane and contacts said first end surface of said projection when said members are fully engaged together and a second annular end surface portion which faces and laterally contacts said second end surface portion of said projection when said members are fully engaged together, and wherein sealing means are provided for sealing between said members, said sealing means comprising an annular radial projection on said peripheral surface of said other member in the region of said second surfaces thereof for force fit engagement with a part of said peripheral surface of said one member.

A pipe connector comprising a tubular pin member having a generally frusto-conical outer peripheral surface having an inner axial end and a free outer axial end and a tubular box member having a generally frusto-conical inner peripheral surface having an inner axial end and a free outer axial end, said generally frusto-conical inner peripheral surface of said tubular box member corresponding to said frusto-conical outer peripheral surface of said pin member and overlying said outer peripheral surface of said pin member when the members are fully engaged together, said frusto-conical surfaces being provided with annular projections and grooves which are inter-engaged when said members are fully engaged together to axially lock said members together, wherein each of said members is provided with an annular projection extending about the inner end of said peripheral surface thereof and projecting in the direction of the free end of the respective member, said projection on said pin member having a first annular radially outer end surface portion which extends in a generally radial plane and a second annular radially inner generally radially inwardly directed end surface portion, said free end of said box member having a first radially outer end surface portion which extends in a generally radial plane and faces said first surface portion of said projection of said pin member when said members are fully engaged together, and a second radially inner generally radially outwardly directed end surface portion which laterally contacts said second end portion of said projection of said pin member when said members are fully engaged together, said projection on said box member having a first annular radially inner end surface portion which extends in a generally radial plane and a second annular radially outer generally radially outwardly directed end surface portion, said free end of said pin member having a first radially inner end surface portion which extends in a generally radial plane and faces said first surface portion of said projection of said box member when said members are fully engaged together, and a second radially outer generally radially inwardly directed end surface portion which laterally contacts said second end surface portion of said projection of said box member when said members are fully engaged together.

A pipe connector comprising a tubular pin member having a generally frusto-conical outer peripheral surface having an inner axial end and a free outer axial end and a tubular box member having a generally frusto-conical inner peripheral surface having an inner axial end and a free outer axial end, said generally frusto-conical inner peripheral surface of said tubular box member corresponding to said frusto-conical outer peripheral surface of said pin member and overlying said outer peripheral surface of said pin member when the members are fully engaged together, said frusto-conical surfaces being provided with annular projections and grooves which are inter-engaged when said members are fully engaged together to axially lock said members together, wherein one of said members is provided with an annular projection extending around the inner end of said peripheral surface thereof and projecting in the direction of the free end of said one member, and, in the region of said projection, said one member is provided with a first surface portion which extends in a generally radial plane, said projection having a second surface portion which faces said peripheral surface of said one member, said free end of the other of said members having a first surface portion which extends in a generally radial plane and contacts said first surface portion of said one member when said members are fully engaged together, and a second surface portion which faces and laterally contacts said second surface portion of said projection when said members are fully engaged together, said second surface portions comprising cylindrical parts which are brought into force-fit sealing contact when said members are fully engaged together, and wherein said peripheral surfaces of said members in the regions of said second surface portions are free of said inter-engageable projections and grooves, an annular radial projection is provided on the peripheral surface of said other member in the region of the second surface portion thereof which, when the members are fully engaged together, makes sealing contact with a part of said peripheral surface of said one member which is cylindrical, and the radial distance between said cylindrical part of said peripheral surface of said one member and said cylindrical part of said second surface portion thereof is less than the radial distance between the crest of said radial projection on said other member and said cylindrical part of said second surface portion thereof when said members are in an unstressed condition before inter-engagement thereof.