Title: Device for sealing the gap between component parts rotatable relative to each other

Abstract: A device for preventing penetration of dust from the outside inwardly into an annular gap between a cutter arm of a cutting machine and a rotatable cutting head carried on said arm, said cutting head having an interior space containing lubricating oil, said device comprising a first seal closing off said interior space and located in said gap, a second seal located in said gap outwardly of said first seal, the grease flow resistance of said second seal in the outward direction being less than the grease flow resistance of said first seal in an inward direction, and a pressurized grease supply line arranged within said cutter arm opening into said gap at a location between said first and second seals whereby during operation of the cutting head grease flows outwardly through said gap and prevents entry of dust into said gap.

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Inventors: Zitz, Alfred (Zeltweg, AT)
Schetina, Otto (Zeltweg, AT)
Kogler, Peter (Knittelfeld, AT)

Application Number: 923445
Filing Date: 1978-07-10
Publication_date: 1980-09-30
Assignee: Vereinigte Osterreichische Eisen- und Stahlwerke-Alpine Montan (Vienna, AT)
Primary Class(es): 277/348 175/372, 277/350, 277/402, 277/411, 277/431, 277/500, 299/78
Other Classes:
US Patent Ref:

2757052	Jul, 1956	Spurgeon	308/187.
2810592	Oct, 1957	Williams	277/17.
2868574	Jan, 1959	Rich	277/152.
2878084	Mar, 1959	Bermingham	277/94.
3389760	Jun, 1968	Morris	175/371.
3419093	Dec, 1968	Lichte et al.	175/372.
3572857	Mar, 1971	Hasegawa	277/94.
3599993	Aug, 1971	Ericksson	277/59.
3612197	Oct, 1971	Motoyama	277/53.
3934311	Jan, 1976	Thompson	177/59.
4106781	Aug, 1978	Benjamin et al.	277/82.

Other Refs: 8112701407288

Apr, 1959	GB
Sep, 1975	GB

Primary Examiner: Ward, Jr., Robert S.
Assistant Examiner:
Attorney: Cushman, Darby & Cushman