# US 5,349,738 A · Attachment methodology for composite cylinder assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,349,738 A - Document ID: US5349738A - Status: Granted - Kind: A - Application number: 08/128,786 - Filed: 1993-09-30 - Granted: 1994-09-27 - Earliest claimed: 1992-04-07 - Assignees: The United States of America as represented by the Secretary of the Navy - Inventors: Roger M. Crane; Paul Coffin - Web page: https://patentgrep.com/patent/US5349738A ## CPC - F16L 37/252: the male part having lugs on its periphery penetrating into the corresponding slots provided in the female part - Y10S 285/913: Interdigitating - Y10T 29/4984: Retaining clearance for motion between assembled parts - Y10T 29/49925: Inward deformation of aperture or hollow body wall - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Cylinder-to-cylinder attachment method and construction featuring nonutiltion of mechanical fasteners or bonding, especially advantageous for attachment of cylinders which are composite or to be subjected to hydrostatic pressure. A fastening ring is interpositionally and rotatively engaged and aligned with a toothed axial end of each cylinder whereby the inwardly radial teeth for each cylinder appropriately mesh with the outer grooved circumferential surface of the fastening ring. The resultant joint is easily detachable and less susceptible than conventional joints to damage, breakage, degradation, stress concentrations and fluid infiltration. ## Claims ### Claim 1 A method for attaching first and second hollow cylinders, each having an axial end and a longitudinal axis, comprising: engaging a fastening ring with a first flanged axial end of a first cylinder whereby a plurality of first teeth mesh with said fastening ring at the locations of intersection of a first circumferential channel with a plurality of axial channels; engaging said fastening ring with a second flanged axial end of a second cylinder whereby a plurality of second teeth oppose said fastening ring at the locations of intersection of a second circumferential channel with a plurality of axial channels; said first flanged axial end having a first radially inwardly planar flange which is normal to the axis of said first cylinder; said first radially inwardly planar flange having said plurality of first teeth selectively distributed around the inner perimeter of said first radially inwardly planar flange; said second flanged axial end having a second radially inwardly planar flange which is nodal to the axis of said second cylinder; said second radially inwardly planar flange having said plurality of second teeth selectively distributed, correspondingly with said first teeth, around the inner perimeter of said second radially inwardly planar flange; said fastening ring includes an outer circumferential surface having said first circumferential channel, said second circumferential channel and said plurality of axial channels; said axial channels perpendicularly intersecting said first circumferential channel and said second circumferential channel; said first circumferential channel, said second circumferential channel and said axial channels forming three parallel circumferential rows of alternating raised and recessed faces and a plurality of parallel axial rows of alternating raised and recessed faces; said three circumferential rows being a first lateral circumferential row, a second lateral circumferential row and an intermediate circumferential row; said first circumferential channel being interposed between said first lateral circumferential row and said intermediate row; said second circumferential channel being interposed between said second lateral circumferential row and said intermediate row; said axial channels being selectively distributed correspondingly with said first teeth of said first radially inwardly planar flange and with said second teeth of said second radially inwardly planar flange; and rotating said fastening ring so as to align said first teeth and said second teeth with said axial rows, said first teeth meshing with said recessed faces of said axial rows and interposed between said raised faces of said first lateral circumferential row and said raised faces of said intermediate circumferential row, said second teeth meshing with said recessed faces of said axial rows and interposed between said raised faces of said second lateral circumferential row and said raised faces of said intermediate circumferential row. ### Claim 2 (depends on 1) A method for attaching hollow cylinders as in claim 1, further comprising forming said first flanged axial end of said first cylinder, said forming including radially inwardly bending and toothing a first axial end of said first cylinder. ### Claim 3 (depends on 1) A method for attaching hollow cylinders as in claim 1, further comprising forming said second flanged axial end of said second cylinder, said forming including radially inwardly bending and toothing a second axial end of said second cylinder. ### Claim 4 (depends on 1) A method for attaching hollow cylinders as in claim 1, further comprising forming said first flanged axial end of said first cylinder and forming said second flanged axial end of said second cylinder, said forming including radially inwardly bending and toothing a first axial end of said first cylinder, and radially inwardly bending and toothing a second axial end of said second cylinder. ### Claim 5 (depends on 1) A method for attaching hollow cylinders as in claim 1, further comprising setting a sealing ring radially outwardly adjacent to said fastening ring and between said first flanged axial end and said second flanged axial end, said sealing ring being substantially flush with the outer circumferential surface of said first cylinder and the outer circumferential surface of said second cylinder. ### Claim 6 (depends on 1) A method for attaching hollow cylinders as in claim 1, wherein at least one said first tooth and at least one said raised face of said first lateral circumferential row have complementarily slanted side surfaces. ### Claim 7 (depends on 1) A method for attaching hollow cylinders as in claim 1, wherein at least one said second tooth and at least one said raised face of said second lateral circumferential row have complementarily slanted side surfaces. ### Claim 8 A method for attaching first and second hollow cylinders, each having an axial end and a longitudinal axis, comprising: engaging a fastening ring with a first tooth ring of a first cylinder whereby a plurality of first teeth mesh with said fastening ring at the locations of intersection of a first circumferential channel with a plurality of axial channels; engaging said fastening ring with a second tooth ring of a second cylinder whereby a plurality of second teeth oppose said fastening ring at the locations of intersection of a second circumferential channel with a plurality of axial channels; said first tooth ring being mated within a first flanged axial end of said first cylinder, said first tooth ring having said plurality of first teeth, said first tooth ring having a first circumferentially planar portion and a first radially inwardly planar portion; said first radially inwardly planar portion having said first teeth selectively distributed around the perimeter of said first radially inwardly planar portion; said second tooth ring being mated within a second flanged axial end of said second cylinder, said second tooth ring having said plurality of second teeth, said second tooth ring having a second circumferentially planar portion and a second radially inwardly planar portion; said second radially inwardly planar portion having said second teeth selectively distributed, correspondingly with said first teeth, around the perimeter of said second radially inwardly planar portion; said first flanged axial end having a first radially inwardly planar flange which is normal to the axis of said first cylinder; said second flanged axial end having a second radially inwardly planar flange which is normal to the axis of said second cylinder; said fastening ring includes an outer circumferential surface having said first circumferential channel, said second circumferential channel and said plurality of axial channels; said axial channels perpendicularly intersecting said first circumferential channel and said second circumferential channel; said first circumferential channel, said second circumferential channel and said axial channels forming three parallel circumferential rows of alternating raised and recessed faces and a plurality of parallel axial rows of alternating raised and recessed faces; said three circumferential rows being a first lateral circumferential row, a second lateral circumferential row and an intermediate circumferential row; said first circumferential channel being interposed between said first lateral circumferential row and said intermediate row; said second circumferential channel being interposed between said second lateral circumferential row and said intermediate row; said axial channels being selectively distributed correspondingly with said first teeth of said first tooth ring and with said second teeth of said second tooth ring; and rotating said fastening ring so as to align said first teeth and said second teeth with said axial rows, said first teeth meshing with said recessed faces of said axial rows and interposed between said raised faces of said first lateral circumferential row and said raised faces of said intermediate circumferential row, said second teeth meshing with said recessed faces of said axial rows and interposed between said raised faces of said second lateral circumferential row and said raised faces of said intermediate circumferential row. ### Claim 9 (depends on 8) A method for attaching hollow cylinders as in claim 8, further comprising, prior to said engaging of said fastening ring with said first tooth ring, radially inwardly bending said first axial end of said first cylinder to form said first flanged axial end, and mating said first tooth ring within said first flanged axial end. ### Claim 10 (depends on 9) A method for attaching hollow cylinders as in claim 9, further comprising toothing said first tooth ring. ### Claim 11 (depends on 8) A method for attaching hollow cylinders as in claim 8, further comprising, prior to said engaging of said fastening ring with said second tooth ring, radially inwardly bending said second axial end of said second cylinder to form said second flanged axial end, and mating said second tooth ring within said second flanged axial end. ### Claim 12 (depends on 11) A method for attaching hollow cylinders as in claim 11, further comprising toothing said second tooth ring. ### Claim 13 (depends on 8) A method for attaching hollow cylinders as in claim 8, further comprising, prior to said engaging of said fastening ring with said first tooth ring and with said second tooth ring, radially inwardly bending said first axial end of said first cylinder to form said first flanged axial end, mating said first tooth ring within said first flanged axial end, radially inwardly bending said second axial end of said second cylinder to form said second flanged axial end, and mating said second tooth ring within said second flanged axial end. ### Claim 14 (depends on 13) A method for attaching hollow cylinders as in claim 13, further comprising toothing said first tooth ring and said second tooth ring. ### Claim 15 (depends on 8) A method for attaching hollow cylinders as in claim 8, further comprising setting a sealing ring radially outwardly adjacent to said fastening ring and between said first flanged axial end and said second flanged axial end, said sealing ring being substantially flush with the outer circumferential surface of said first cylinder and the outer circumferential surface of said second cylinder. ### Claim 16 (depends on 8) A method for attaching hollow cylinders as in claim 8, wherein said first circumferentially planar portion of said first tooth ring is tapered in the axial direction opposite said fastening ring. ### Claim 17 (depends on 8) A method for attaching hollow cylinders as in claim 8, wherein said second circumferentially planar portion of said second tooth ring is tapered in the axial direction opposite said fastening ring. ### Claim 18 (depends on 8) A method for attaching hollow cylinders as in claim 8, wherein said first teeth are uniformly distributed around said perimeter of said first radially inwardly planar portion. ### Claim 19 (depends on 8) A method for attaching hollow cylinders as in claim 8, wherein said second teeth are uniformly distributed around said perimeter of said second radially inwardly planar portion. ### Claim 20 (depends on 8) A method for attaching hollow cylinders as in claim 8, wherein at least one said first tooth and at least one said raised face of said first lateral circumferential row have complementarily slanted side surfaces. ### Claim 21 (depends on 8) A method for attaching hollow cylinders as in claim 8, wherein at least one said second tooth and at least one said raised face of said second lateral circumferential row have complementarily slanted side surfaces.