Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1983-01-14
1984-07-24
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 30, F16J 1532
Patent
active
044614861
ABSTRACT:
Scraper rings are known which are mounted in the back plate of a hydraulic cylinder to scrape a hydraulic piston rod. Known scrapers are not very suitable for applications where the piston rod is liable to movement and vibration e.g. in pneumatic pistons and cylinders. The present invention provides a shaft scraper ring arrangement in which the scraper ring is so supported so as to be movable, to a limited extent, in a plane transverse to the shaft or rod which is to be scraped. Cylinder 1 contains a piston 2 and a back plate 3. Supported centrally in the back plate 3 is a housing 4 which supports a plate 5 carrying a rod scraper 5a. Piston 2 is supported by a piston rod 2a which is scraped by the rod scraper. A seal 10 located on the rod scraper plate 5 bears against the rod 2a. Rod scraper plate 5 has limited freedom for movement in a plane transverse to the rod 2a. The plate 5 is loosely carried by the housing 4 being located between two felt oil retaining annular rings 8. Also within the housing is a reticulated polyurethane foam breather element 9.
REFERENCES:
patent: 838650 (1906-12-01), Rudd
patent: 2307152 (1943-01-01), Murray
patent: 2473139 (1949-06-01), Dickerman
patent: 3179423 (1965-04-01), McCloud
patent: 3203511 (1965-08-01), Long
patent: 3266810 (1966-08-01), Reeser
patent: 3953037 (1976-04-01), Winfield
patent: 4235445 (1980-11-01), Lundholm
patent: 4311313 (1982-01-01), Vedova
patent: 4353558 (1982-10-01), Firth
Smith Robert I.
Westinghouse Brake and Signal Co. Ltd.
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