Shaft seal with scraper

Details Shaft seal with scraper Shaft seal with scraper

1977-04-04

1979-09-25

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277235R, F16J 1556

Patent

active

041688376

ABSTRACT:
An annular scraper and a shaft seal including a scraper and a method for making the same. The seal and scraper are of bonded construction. The seal includes an outer shell such as a stainless steel capsule, a polytetrafluoroethylene sealing element, a brass scraper, and a bonded elastomeric ring behind the scraper to allow deflection and return of the scraper. The scraper is preferably a single member having a continuous, uniform scraping edge without any slits. A bushing can be included for guiding a reciprocating shaft (a cable or rod) in near perfect alignment. The process preferably includes the step of forming the scraping edge by pinching or piercing a brass member in the mold simultaneously with the steps of molding the elastomeric ring and bonding the elastomeric ring to the scraper. The process of making the seal includes the step of simultaneously forming the ring of polytetrafluoroethylene into a sealing element. The piercing step eliminates the need for a separate piercing step and provides improved concentricity of the annular scraping edge.

REFERENCES:
patent: 2509151 (1950-05-01), Kasten
patent: 3493645 (1970-02-01), Sanderson et al.

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