Spirometer with double rolling seals

Details Spirometer with double rolling seals Spirometer with double rolling seals

1986-09-15

1987-11-17

Kamm, William E.

Surgery

Truss

Pad

128727, 73263, A61B 508

Patent

active

047066857

ABSTRACT:
A spirometer having double rolling seals, each seal comprising an annular elastomeric membrane folded upon itself and arranged between a piston and a cylindircal casing so that the rounded folds of the two membranes face each other. When the piston is fully extended, a major portion of the axial length of one of the membranes extends axially well beyond the rear limits of the piston; however, that membrane is nevertheless retained alongside the inner surface of the casing, and does not collapse inwardly into the path of return movement of the piston, because of a protective effect provided by the second membrane. Additional assurance against inward collapse may be achieved by depressurizing the annular space between the opposing membranes. A serpentine leaf spring returns the piston to its zero position and is configured and arranged to provide diminishing resistance with increasing forward travel of the piston.

REFERENCES:
patent: 3086515 (1963-04-01), Jones
patent: 3722506 (1973-03-01), McMillan, Jr.

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