# US 4,400,020 A · Pressure tank connector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,400,020 A - Document ID: US4400020A - Status: Granted - Kind: A - Application number: 06/291,821 - Filed: 1981-08-10 - Granted: 1983-08-23 - Earliest claimed: 1981-08-10 - Inventors: Russell D. Keller - Web page: https://patentgrep.com/patent/US4400020A ## CPC - F16L 41/10: the extremity of the pipe being screwed into the wall - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL ## Abstract A pressure tank connector apparatus is described with a connector fitting having a fitting insert sleeve of steel or other harder metal than the fitting body which is crimped over an outwardly extending flange or lip portion of the tank wall surrounding the opening in the pressure tank to which the connector is attached to position the fitting body within the tank and spaced inwardly from the flange. The fitting body is molded of aluminum alloy and the insert sleeve is embedded into the body during molding. A plurality of spaced hemispherical projections are molded onto the outer side of the fitting body and mate with correspondingly shaped indentations on the inner side of the tank wall portion surrounding such opening to prevent rotation of the fitting when a tank connector member is threaded into the central passage of such fitting body. A sealing ring of elastomer material is clamped between the outer side of the fitting body and the inner side of the tank wall at a position surrounding the fitting insert sleeve, in order to provide a gas tight seal. As a result, the pressure tank connector apparatus is safe and strong so that it is capable of withstanding much higher pressures than atmospheric pressure, such as a working pressure of 150 psi and a failsafe pressure of five times that amount. Thus, the invention is suitable for use as a connector for an air brake tank on a truck or other vehicle. ## Claims ### Claim 1 A pressure tank apparatus comprising: a connector fitting means for sealing an opening in the wall of a pressure tank surrounded by an outwardly extending flange portion of the wall, and for coupling an external fluid conduit connector to the interior of said tank; said fitting means including a fitting body positioned inside said tank inwardly of the tank wall portion surrounding the flange portion and spaced inwardly from said flange portion toward the interior of the tank and having a passageway therethrough with internal threads for coupling to said conduit connector; a sleeve of harder material than the fitting body attached to said body surrounding said threaded passageway and extending outwardly from one side of the body to a free end, said free end extending through the opening in the tank wall and bending over the flange portion surrounding the periphery of said opening to clamp the fitting means to the tank; and gripping means for preventing said body from rotating relative to said tank wall by engagement with the tank wall. ### Claim 2 (depends on 1) Apparatus in accordance with claim 1 in which the fitting body and the sleeve are clamped to the wall of a pressure tank with said body positioned inside said tank. ### Claim 3 (depends on 2) Apparatus in accordance with claim 2 in which a sealing means for providing a fluid tight seal between said one side of said body and inside of the tank wall in a position surrounding said sleeve. ### Claim 4 (depends on 3) Apparatus in accordance with claim 3 in which the sealing means is a sealing ring of elastomer material. ### Claim 5 (depends on 2) Apparatus in accordance with claim 2 in which the free end of the sleeve is crimped over an outwardly projecting flange portion of the tank wall at the periphery of said opening. ### Claim 6 (depends on 5) Apparatus in accordance with claim 5 in which the other end of the sleeve is attached to the fitting body as a hard metal insert embedded in said body which is made of a softer metal than said sleeve. ### Claim 7 (depends on 6) Apparatus in accordance with claim 6 in which said body is molded of aluminum alloy and the sleeve is made of steel. ### Claim 8 (depends on 2) Apparatus in accordance with claim 2 in which a fluid conduit connector having external threads is threadedly fastened to the threads of said fitting body. ### Claim 9 (depends on 4) Apparatus in accordance with claim 4 in which the gripping means includes a plurality of projections extending outwardly from said one side of said body into engagement with the tank wall and spaced around said sleeve, said sealing ring being positioned between said sleeve and said projections. ### Claim 10 (depends on 9) Apparatus in accordance with claim 9 in which the tank wall is provided with a plurality of indentations spaced around the periphery of said opening in position to be engaged by said projections. ### Claim 11 (depends on 1) Apparatus in accordance with claim 1 in which the other end of the sleeve is attached to the fitting body as a hard metal insert embedded in said body which is made of a softer metal than said sleeve. ### Claim 12 (depends on 11) Apparatus in accordance with claim 11 in which said body is molded of aluminum material and the sleeve is made of a harder metal than said aluminum material. ### Claim 13 A pressure tank apparatus comprising: a pressure tank for holding gas under high pressure greater than atmospheric pressure; a connector fitting means for sealing an opening in the wall of said pressure tank surrounded by an outwardly extending flange portion of the wall, and for coupling an external gas conduit to the interior of said tank; said fitting means including a fitting body positioned inside said tank inwardly of the tank wall portion surrounding the flange portion and spaced inwardly from said flange portion toward the interior of the tank in engagement with the inner surface of the tank wall and having a passageway therethrough with internal threads for coupling to said conduit connector; a sleeve of harder meterial than the fitting body extending outwardly from one side of said body to a free end and surrounding said threaded passageway, said free end extending through said tank wall opening and being bent over said flange portion of the wall forming the periphery of said opening to clamp the fitting means to the tank; said threaded passageway of said fitting body being positioned inwardly of the tank wall toward the interior of the tank so that said passageway is entirely inside the inner surface of said tank wall; and said free end of said sleeve extending outside the outer surface of said tank wall a distance less than the thickness of said body. ### Claim 14 (depends on 13) Tank apparatus in accordance with claim 13 which also includes gripping means provided on the fitting body for preventing said body from rotating relative to said tank wall by engagement with said tank wall. ### Claim 15 (depends on 13) Tank apparatus in accordance with claim 13 in which the gripping means includes a plurality of projections extending outwardly from said one side of said body into a plurality of indentations provided in the inner surface of the tank wall spaced around said opening. ### Claim 16 (depends on 13) Tank apparatus in accordance with claim 13 in which the sleeve is of harder material than the fitting body. ### Claim 17 (depends on 16) Tank apparatus in accordance with claim 16 in which the other end of the sleeve is attached to the fitting body as a hard metal insert embedded in said body which is made of a softer metal than said sleeve. ### Claim 18 (depends on 17) Tank apparatus in accordance with claim 17 in which said body is molded of aluminum alloy and the sleeve is made of a harder metal than said aluminum alloy. ### Claim 19 (depends on 13) Tank apparatus in accordance with claim 13 which also includes a sealing means for providing a gas tight seal between said one side of said fitting body and the tank wall in a position surrounding said sleeve. ### Claim 20 (depends on 19) Tank apparatus in accordance with claim 19 in which the sealing means is a sealing ring of elastomer material.