Sealing construction for slide type vacuum pump with finger port

Details Sealing construction for slide type vacuum pump with finger port Sealing construction for slide type vacuum pump with finger port

1986-08-04

1987-09-22

Cohan, Alan

Expansible chamber devices

With separate biasing means for working member

92249, 92194, 277139, F16J 906

Patent

active

046947345

ABSTRACT:
A slide type vacuum pump has a cylinder bore with a cylindrical piston reciprocatingly slidably fitted therein and defining a vacuum pumping chamber. A seal element is housed in an annular groove around the piston defined by a radially extending annular surface and an axially extending cylindrical surface. The seal element includes an inwardly radially extending annular portion axially abutted against the annular groove defining surface and an axially extending cylindrical portion slidingly sealing against the cylinder bore. A first spring member has an inwardly radially extending annular portion axially abuttingly holding the annular seal element portion against the annular groove defining surface, and several axially extending resilient finger portions each angled outwards somewhat and springingly pressing the cylindrical seal element portion radially outwards against the cylinder bore to effect sealing therebetween. The outer peripheral portion of a second disk shaped spring member resiliently axially presses the first spring member annular portion and the annular seal element portion against the annular groove defining surface.

REFERENCES:
patent: 559589 (1896-05-01), Miehle
patent: 847785 (1957-03-01), Kleinberg
patent: 1390680 (1921-09-01), Drew
patent: 2106829 (1938-02-01), Christenson
patent: 3295419 (1967-01-01), Vielmo
patent: 4541640 (1985-09-01), Tregonning

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