Bonded slip joint pipe fitting

A pipe fitting for a substantially cylindrical pipe, the pipe extending along a first axis and having inner and outer surfaces of substantially constant respective diameters, the pipe further having at least one accessible end, the pipe fitting being able to be placed at any point along the pipe;

• said pipe fitting comprising:
• a hub extending along a second axis, the first end having an inner bore of diameter similar to said outer pipe diameter, a tapered transition section between first and second ends, and a second end having an inner diameter larger than said outer pipe diameter by a predetermined amount, and at least one substantially helical rib disposed about and along said second axis;
• a cap extending along a third axis, the inner bore having a protrusion about and along said third axis, said protrusion having a leading edge with a diameter larger than said outer pipe diameter by a predetermined amount, and at least one inner-trailing edge with a diameter similar to said outer pipe diameter, with said cap having at least one substantially helical rib disposed about and along said third axis;
• whereby said cap is adapted to mount to said hub via engagement of said helical ribs on said cap and said helical ribs on said hub, thereby urging said protrusion of said cap against said tapered section of said hub thus deforming said leading edge of said protrusion radially inward.

A pipe fitting for use with adhesive on a substantially cylindrical pipe, the pipe extending along a first axis and having inner and outer surfaces of substantially constant respective diameters, the pipe further having at least one accessible end, the pipe fitting being able to be placed at any point along the pipe;

• said pipe fitting comprising:
• a hub extending along a second axis, the first end having an inner bore of diameter similar to said outer pipe diameter, a tapered transition section between first and second ends, and a second end having an inner diameter larger than said outer pipe diameter by a predetermined amount, and at least one substantially helical rib disposed about and along said second axis;
• a cap extending along a third axis, the inner bore having a protrusion about and along said third axis, said protrusion having a leading edge with a diameter larger than said outer pipe diameter by a predetermined amount, and at least one inner-trailing edge with a diameter similar to said outer pipe diameter, with said cap having at least one substantially helical rib disposed about and along said third axis;
• whereby said cap and said hub are slid over said open end of said pipe, and said adhesive applied to said hub and said pipe around and along the junction of said tapered section of said hub and said pipe;
• whereby said cap is urged along said pipe to contact said hub, thereby urging said adhesive into the gap between said protrusion and said pipe;
• whereby said cap is adapted to mount to said hub via engagement of said helical ribs on said cap and said helical ribs on said hub, thereby urging said protrusion of said cap against said tapered section of said hub thus deforming said leading edge of said protrusion radially inward and against said pipe, sandwiching said adhesive between said pipe and said protrusion and between said hub and said protrusion.

A pipe fitting for use with adhesive on a substantially cylindrical pipe, the pipe having inner and outer surfaces of substantially constant respective diameters, the pipe further having at least one accessible end, the pipe fitting being able to be placed at any point along the pipe;

• said pipe fitting comprising:
• a. a hub extending along an axis, the first end having an inner bore similar to said outer pipe diameter, a tapered transition section between first and second ends, and a second end having an inner diameter larger than said outer pipe diameter by a predetermined amount;
• b. a cap extending along a second axis, having an inner bore similar to said outer pipe diameter;
• c. a sealing means for sandwiching said adhesive between said sealing means and said pipe, and between said sealing means and said hub;
• d. an attachment means for mounting said cap onto said hub, having at least one substantially helical rib on said cap and/or said hub;
• whereby said cap is adapted to mount to said hub via said attachment means, thereby urging said sealing means into position against said pipe and said hub.