# US 10,119,635 B2 · Locking fluid fittings > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,119,635 B2 - Document ID: US10119635B2 - Status: Granted - Kind: B2 - Application number: 14/200,649 - Filed: 2014-03-07 - Published: 2014-10-23 - Granted: 2018-11-06 - Earliest claimed: 2013-03-08 - Assignees: United Technologies Corporation - Applicants: United Technologies Corporation - Inventors: Billie W. Bunting; Robert J. DeRosa; Craig Michael Callaghan; Mark W. Colebrook; Ranganath Santosh - Web page: https://patentgrep.com/patent/US10119635B2 ## CPC - F16L 15/006: {with straight threads} - F02C 7/222: {Fuel flow conduits, e.g. manifolds} - F16L 15/00: Screw-threaded joints; Forms of screw-threads for such joints - Y10T 29/49895: Associating parts by use of aligning means [e.g., use of a drift pin or a "fixture"] - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A fluid conduit for a gas turbine engine includes a first fluid conduit attachable to a second fluid conduit and securable together with a lockable connector. The connector includes a first portion including external threads and a second portion receiving the first portion and including internal threads mating to the external threads of the first portion. The internal threads include lead threads defining a first thread interface with the external threads for starting attachment of the first portion to the second portion and locking threads defining a second thread interface for locking the first portion to the second portion. ## Claims ### Claim 1 A fluid connection fitting comprising: a first portion including external threads; and a second portion receiving the first portion and including internal threads for mating to the external threads, the internal threads include lead threads defining a first thread interface with the external threads for starting attachment of the first portion to the second portion and locking threads defining a second thread interface for locking the first portion to the second portion. ### Claim 2 (depends on 1) The fluid connection fitting as recited in claim 1, wherein the locking threads are non-concentric about a central axis of the second portion and the lead threads are concentric about the central axis. ### Claim 3 (depends on 1) The fluid connection fitting as recited in claim 1, wherein the connector includes a first thickness disposed at the lead threads and a second thickness disposed at the locking threads, with the second thickness less than the first thickness for providing for deformation of an outer diameter proximate to the locking threads. ### Claim 4 (depends on 3) The fluid connector fitting as recited in claim 3, wherein the first thickness corresponds with a first diameter and the second thickness corresponds with a second diameter less than the first diameter. ### Claim 5 (depends on 1) The fluid connector fitting as recited in claim 1, including a relief disposed between the lead threads and the locking threads, wherein the relief does not include threads. ### Claim 6 (depends on 5) The fluid connector fitting as recited in claim 5, wherein the locking threads define an interference fit with the external threads of the first portion. ### Claim 7 (depends on 5) The fluid connector as recited in claim 5, wherein the lead threads and the locking threads include a first inner diameter and the relief comprises a second inner diameter greater than the first diameter. ### Claim 8 (depends on 5) The fluid connector as recited in claim 5, wherein the relief comprises an axial length greater than at least two of the lead threads. ### Claim 9 A fluid conduit for a gas turbine engine comprising: a first fluid conduit attachable to a second fluid conduit along an axis; and a connector for securing the first fluid conduit to the second fluid conduit, the connector including a first portion including external threads; and a second portion receiving the first portion and including internal threads for mating to the external threads, the internal threads include lead threads defining a first thread interface with the external threads for starting attachment of the first portion to the second portion and locking threads defining a second thread interface for locking the first portion to the second portion. ### Claim 10 (depends on 9) The fluid conduit as recited in claim 9, wherein the locking threads are non-concentric about a central axis of the second portion and the lead threads are concentric about the central axis. ### Claim 11 (depends on 10) The fluid conduit fitting as recited in claim 10, wherein the connector includes a first thickness disposed at the lead threads and a second thickness disposed at the locking threads, with the second thickness less than the first thickness for providing for deformation of an outer diameter proximate to the locking threads. ### Claim 12 (depends on 11) The fluid conduit fitting as recited in claim 11, wherein the first thickness corresponds with a first diameter and the second thickness corresponds with a second diameter less than the first diameter. ### Claim 13 (depends on 9) The fluid conduit fitting as recited in claim 9, including a relief disposed between the lead threads and the locking threads, wherein the relief does not include threads. ### Claim 14 (depends on 13) The fluid conduit fitting as recited in claim 13, wherein the locking threads define an interference fit with the external threads of the first portion. ### Claim 15 (depends on 13) The fluid conduit as recited in claim 13, wherein the lead threads and the locking threads include a first inner diameter and the relief comprises a second inner diameter greater than the first diameter. ### Claim 16 A method of locking a fluid fitting comprising: defining a first coupling portion including external threads; defining a second coupling portion receiving the first portion and including internal threads for mating to the external threads, the internal threads include lead threads defining a first thread interface with the external threads for starting attachment of the first portion to the second portion and locking threads defining a second thread interface for locking the first portion to the second portion; and aligning the first coupling portion with the second coupling portion by engaging the externals threads the lead in threads; and locking the first coupling portion to the second coupling portion by engaging the external threads with the locking threads of the second coupling portion. ### Claim 17 (depends on 16) The method as recited in claim 16, including generating a locking fit by deforming the locking threads to be non-concentric about a central axis of the second portion and maintaining the lead threads as concentric about the central axis. ### Claim 18 (depends on 16) The method as recited in claim 16, including generating a locking fit by providing the locking threads with an interference fit relative to the external threads. ### Claim 19 (depends on 18) The method as recited in claim 18 including providing a relief disposed between the lead threads and the locking threads with the relief not including threads.