# US 5,704,770 A · Air passage insert for oil fill spout > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,704,770 A - Document ID: US5704770A - Status: Granted - Kind: A - Application number: 08/304,265 - Filed: 1994-09-12 - Granted: 1998-01-06 - Earliest claimed: 1994-09-12 - Assignees: Westinghouse Air Brake Company - Inventors: Brian Cunkelman - Web page: https://patentgrep.com/patent/US5704770A ## CPC - F01M 13/00: Crankcase ventilating or breathing - F01M 11/04: Filling or draining lubricant of or from machines or engines - F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING ## Abstract An air passage insert for an oil fill spout disposed on a side of an oil crankcase which includes an air communication passageway having a first end thereof disposed within an interior portion of such oil crankcase at a position above an oil full level and a second end thereof being in communication with atmosphere for communicating air from such interior portion of such oil crankcase in a space located above such oil full level. There is an further provided an attachment device which is engageable with both such air communication passageway and such oil fill spout for attaching the air communication passageway at least to one of such oil fill spout and such interior portion of such oil crankcase thereby enabling air to be vented from such space located above such oil fill level during an oil filling process. ## Claims ### Claim 1 In an air compressor having an oil crankcase with an oil fill spout disposed on a side of such oil crankcase, the improvement comprising an air passage insert comprising: (a) an air communication means having a first end thereof disposed within an interior portion of said oil crankcase at a position above an oil full level and a second end thereof being in communication with the atmosphere outside of the crankcase for communicating air from the interior portion of said oil crankcase in a space located above such oil full level to the outside atmosphere; and (b) an attachment means engageable with both said air communication means and said oil fill spout for attaching said air communication means at least to one of said oil fill spout and the interior portion of said oil crankcase thereby enabling air to be vented to the outside atmosphere from the space located above such oil fill level during an oil filling process. ### Claim 2 (depends on 1) An air compressor, according to claim 1, wherein said air compressor is an industrial type air compressor. ### Claim 3 (depends on 2) An air compressor, according to claim 2, wherein said air communication means is a tube like member having a predetermined configuration. ### Claim 4 (depends on 3) An air compressor, according to claim 3, wherein said predetermined configuration of said tube like member is such that at least said first end thereof is disposed substantially facing a bottom surface of said oil crankcase. ### Claim 5 (depends on 4) An air compressor, according to claim 4, wherein said tube like member is formed from metal. ### Claim 6 (depends on 2) An air compressor, according to claim 2, wherein said attachment means includes at least one washer like member engageable at a predetermined position in said oil fill spout and having said second end of said air communication means secured thereto. ### Claim 7 (depends on 2) An air compressor, according to claim 2, wherein said attachment means includes at least one clamp member engagable with said air communication means and with at least one of said interior portion of said oil crankcase and an interior portion of said oil fill spout. ### Claim 8 (depends on 2) An air compressor, according to claim 2, wherein said attachment means includes at least one washer like member engageable at a predetermined position in said oil fill spout and having said second end of said air communication means secured thereto and at least one clamp member engagable with said air communication means and with said interior portion of said oil crankcase. ### Claim 9 (depends on 2) An air compressor, according to claim 2, wherein said industrial type air compressor is a 3CD type air compressor disposed on a railway locomotive. ### Claim 10 An air passage insert for an oil fill spout disposed on a side of an oil crankcase, said air passage insert comprising: (a) an air communication means having a first end thereof disposed within an interior portion of such oil crankcase at a position above an oil full level and a second end thereof being in communication with the atmosphere outside of the crankcase for communicating air from such interior portion of the oil crankcase in a space located above such oil full level to the outside atmosphere; and (b) an attachment means engageable with both said air communication means and such oil fill spout for attaching said air communication means at least to one of such oil fill spout and the interior portion of such oil crankcase thereby enabling air to be vented from the space located above such oil fill level during an oil filling. ### Claim 11 (depends on 10) An air passage insert for an oil fill spout, according to claim 10, wherein said air communication means is a tube like member having a predetermined configuration. ### Claim 12 (depends on 11) An air passage insert for an oil fill spout, according to claim 11, wherein said predetermined configuration of said tube like member is such that at least said first end thereof is disposed substantially facing a bottom surface of such oil crankcase. ### Claim 13 (depends on 12) An air passage insert for an oil fill spout, according to claim 12, wherein said tube like member is formed from metal. ### Claim 14 (depends on 10) An air passage insert for an oil fill spout, according to claim 10, wherein said attachment means includes at least one washer like member engageable at a predetermined position in such oil fill spout and having said second end of said air communication means secured thereto. ### Claim 15 (depends on 10) An air passage insert for an oil fill spout, according to claim 10, wherein said attachment means includes at least one clamp member engagable with said air communication means and with at least one of such interior portion of such oil crankcase and an interior portion of such oil fill spout. ### Claim 16 (depends on 10) An air passage insert for an oil fill spout, according to claim 10, wherein said attachment means includes at least one washer like member engageable at a predetermined position in such oil fill spout and having said second end of said air communication means secured thereto and at least one clamp member engagable with said air communication means and with such interior portion of such oil crankcase. ### Claim 17 (depends on 10) An air passage insert for an oil fill spout, according to claim 10, wherein said oil crankcase is disposed on an air compressor. ### Claim 18 (depends on 10) An air passage insert for an oil fill spout, according to claim 10, wherein said air compressor is an industrial type air compressor.