Diaphragm unit

Details Diaphragm unit Diaphragm unit

2005-12-06

2005-12-06

Thorpe, Timothy S. (Department: 3746)

Pumps

Motor driven

Fluid motor

Reexamination Certificate

active

06971859

ABSTRACT:
A diaphragm unit includes a diaphragm and a diaphragm case. The diaphragm has a center point and an outer peripheral portion. The diaphragm case includes a fixing surface and a regulating surface. The fixing surface supports the diaphragm at the outer peripheral portion thereof, thereby defining a fluid chamber in the diaphragm case. The regulating surface forms an inner surface of the fluid chamber, thereby providing a limit of deformation of the diaphragm. The regulating surface has a convex surface region and a concave surface region. The convex surface region is formed continuously with the fixing surface for supporting the diaphragm at a portion thereof adjacent to the outer peripheral portion. The concave surface region is formed continuously with the convex surface region for supporting the diaphragm at a portion thereof adjacent to the center point. Curvatures of the convex and concave surface regions are the same.

REFERENCES:
patent: 3947156 (1976-03-01), Becker
patent: 4634430 (1987-01-01), Polaschegg
patent: 5145336 (1992-09-01), Becker et al.
patent: 5669764 (1997-09-01), Behringer et al.
patent: 6019135 (2000-02-01), Onishi
patent: 6098991 (2000-08-01), Onishi
patent: 6106245 (2000-08-01), Cabuz
patent: 11-62771 (1999-03-01), None
patent: 11-280598 (1999-10-01), None

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