# US 8,770,897 B2 · Coring tool alignment assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,897 B2 - Document ID: US8770897B2 - Status: Granted - Kind: B2 - Application number: 12/612,027 - Filed: 2009-11-04 - Published: 2011-05-05 - Granted: 2014-07-08 - Earliest claimed: 2009-11-04 - Assignees: Advanced Drainage Systems, Inc. - Applicants: Frank P. Martin - Inventors: Frank P. Martin - Web page: https://patentgrep.com/patent/US8770897B2 ## CPC - B23B 47/281: {Jigs for drilling cylindrical parts} - B23B 51/0426: {with centering devices} - F16L 41/04: Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor - F16L 41/08: Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of a wall or to the axis of another pipe (F16L41/02 takes precedence) - B23B 2270/58: Oblique elements - Y10T 408/03: Processes - Y10T 408/558: Opening coaxial with Tool - Y10T 408/56238: Encompassed by Tool during cut - Y10T 408/567: Adjustable, tool-guiding jig - Y10T 408/569: Bushing - Y10T 408/895: Having axial, core-receiving central portion - Y10T 408/98: Drill guide - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A compact assembly for aligning a coring tool relative to a pipe sidewall. The coring tool includes a hollow, cylindrical hole saw mounted to an arbor that has an elongated pilot shaft centered in the hole saw. The assembly is made up of a base plate that is attachable to the pipe sidewall. In one embodiment, a tubular sleeve is mounted to the base plate and has a bore diameter sized for receiving the pilot shaft as the hole saw is advanced toward and saws through the pipe wall, and the entire assembly is sized to fit inside the hole saw as the hole saw saws through the pipe sidewall. In another embodiment, the base plate is configured for use with pipe sidewalls that include outwardly protruding ribs. ## Claims ### Claim 1 A system for aligning a coring tool relative to a pipe sidewall, the system comprising: a hollow, cylindrical hole saw mounted to an arbor that has an elongated pilot shaft centered in the hole saw; a base plate attachable to the pipe sidewall and including a first terminal end having a first planar surface, a second terminal end having a second planar surface opposite the first terminal end, and spaced apart peripheral feet protruding from an underside of the base plate to contact the pipe sidewall, wherein each foot extends from the first planar surface to the second planar surface, wherein the first planar surface extends between a first end of a first foot and a first end of a second foot, and the second planar surface extends between a second end of the first foot and a second end of the second foot; a sleeve aperture through the base plate and having a bore diameter sized such that it receives the pilot shaft as the hole saw is advanced toward and saws through the pipe sidewall; wherein the plate is sized to fit inside the hole saw as the hole saw saws through the pipe sidewall. ### Claim 2 (depends on 1) The system of claim 1 further comprising fastening devices to facilitate attaching the base plate to the pipe sidewall. ### Claim 3 (depends on 1) The system of claim 1 wherein the peripheral feet protrude by an amount sufficient to provide a clearance gap between the spaced apart feet thereby to permit the feet to both simultaneously contact a curved sidewall of the pipe. ### Claim 4 (depends on 3) The system of claim 3 wherein the peripheral feet are sized to permit the curved sidewall of the pipe to extend into the clearance gap without contacting the underside of the base plate. ### Claim 5 (depends on 1) The system of claim 1 wherein the sleeve aperture extends through a thickness of the base plate from a top surface to the underside of the base plate. ### Claim 6 (depends on 1) The system of claim 1 wherein the sleeve aperture is a smooth-walled aperture. ### Claim 7 A system for aligning a coring tool relative to a pipe sidewall, wherein the pipe sidewall includes ribs protruding outwardly therefrom, the system comprising: a hollow, cylindrical hole saw mounted to an arbor that has an elongated pilot shaft centered in the hole saw; a base plate attachable to the pipe sidewall, wherein the base plate includes a first terminal end having a first planar surface and a second terminal end having a second planar surface, wherein the first planar surface and the second planar surface of the base plate are configured to contact the ribs of the pipe sidewall, wherein the base plate includes a first side and a second side opposite the first side, wherein a first single foot extends along the first side of the base plate, and a second single foot extends along the second side of the base plate, wherein the first planar surface extends between a first end of the first single foot and a first end of the second single foot, and the second planar surface extends between a second end of the first single foot and a second end of the second single foot; a sleeve aperture through the base plate and having a bore diameter sized such that it receives the pilot shaft as the hole saw is advanced toward and saws through the pipe sidewall; wherein the plate is sized to fit inside the hole saw as the hole saw saws through the pipe sidewall. ### Claim 8 (depends on 7) The system of claim 7, wherein the ribs include facing surfaces, and wherein the base plate is configured to engage the facing surfaces. ### Claim 9 (depends on 8) The system of claim 8 wherein the base plate is sized to be received between the facing surfaces of the ribs. ### Claim 10 (depends on 8) The system of claim 8 wherein the base plate is configured to provide an interference fit between the facing surfaces of the ribs. ### Claim 11 (depends on 7) The system of claim 7 wherein each foot protrudes from an underside of the base plate to contact the pipe sidewall. ### Claim 12 (depends on 11) The system of claim 11 wherein each foot protrudes by an amount sufficient to provide a clearance gap between the feet thereby to permit the feet to contact a curved sidewall of the pipe. ### Claim 13 (depends on 12) The system of claim 12 wherein the ribs include facing surfaces, and wherein each foot is configured to contact the facing surfaces of the ribs and securely contact the surface of the pipe sidewall. ### Claim 14 (depends on 7) The system of claim 7 wherein the sleeve aperture extends through a thickness of the base plate from a top surface to the underside of the base plate. ### Claim 15 A system for aligning a coring tool relative to a pipe sidewall, the system comprising: a hollow, cylindrical hole saw mounted to an arbor that has an elongated pilot shaft centered in the hole saw; a base plate attachable to the pipe sidewall and including a first terminal end having a first planar surface, a second terminal end having a second planar surface opposite the first terminal end, and spaced apart peripheral feet protruding from an underside of the base plate to contact the pipe sidewall, wherein each foot extends from the first planar surface to the second planar surface, wherein the first planar surface extends between a first end of a first foot and a first end of a second foot, and the second planar surface extends between a second end of the first foot and a second end of the second foot; a sleeve aperture through the base plate and having a bore diameter sized such that it receives the pilot shaft as the hole saw is advanced toward and saws through the pipe sidewall; wherein the peripheral feet protrude by an amount sufficient to provide a clearance gap between the spaced apart feet to receive a curved sidewall of the pipe. ### Claim 16 (depends on 15) The system of claim 15, wherein the pipe sidewall includes ribs protruding outwardly therefrom. ### Claim 17 (depends on 16) The system of claim 16, wherein the ribs include facing surfaces, and wherein the base plate is positioned between the facing surfaces. ### Claim 18 (depends on 17) The system of claim 17, wherein the base plate is configured to engage the facing surfaces of the ribs to enable the base plate to move downwardly between the ribs and into secure contact with the surface of the side of the pipe between the ribs. ### Claim 19 (depends on 15) The system of claim 15, wherein the peripheral feet simultaneously contact the sidewall of the pipe. ### Claim 20 (depends on 15) The system of claim 15, wherein the feet are sized to provide a gap sufficient to receive the sidewalls of pipes having different radii.