Pump sealing apparatus

Details Pump sealing apparatus Pump sealing apparatus

2008-07-22

2008-07-22

Lazo, Thomas E (Department: 3745)

Expansible chamber devices

Collapsible chamber wall portion

Wall portion formed of flexible material

C417S413100

Reexamination Certificate

active

07401543

ABSTRACT:
A sealing arrangement for a pump includes a first member having a peripheral wedge-shaped pocket; a second member with a rim opposed to the pocket; and a diaphragm disposed between the two members. The diaphragm includes a central stem, a disk-shaped head attached to the stem, and an upstanding bead disposed around the periphery of the head. The bead includes a first angled surface and a second angled surface. The bead is received in the pocket so as to form two separate, spaced-apart sealing surfaces between the diaphragm and the first member. The sealing arrangement may also include a gasket made from a resilient material and having a flat web with a circular crosssection bead disposed in a gland between two members. The dimensions of the bead and the gland are selected such that the bead is diametrically compressed at least about 40% from its free state.

REFERENCES:
patent: 5275541 (1994-01-01), Becker et al.
patent: 6338295 (2002-01-01), Kubota et al.
patent: 6579074 (2003-06-01), Chiba
patent: 6776591 (2004-08-01), Rinninger et al.
patent: 7293967 (2007-11-01), Fukano et al.
patent: 2004/0076526 (2004-04-01), Fukano et al.

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