Expansible chamber devices – Collapsible chamber wall portion – Wall portion formed of flexible material
Reexamination Certificate
2007-04-10
2007-04-10
Kershteyn, Igor (Department: 3745)
Expansible chamber devices
Collapsible chamber wall portion
Wall portion formed of flexible material
C092S09800R, C417S413100
Reexamination Certificate
active
10520634
ABSTRACT:
The invention relates to a diaphragm pump for pumping aggressive and/or abrasive media, such as slurries, comprising a diaphragm housing mounted in a substantially vertically disposed pipe system, which substantially vertically disposed pipe system comprises at least one inlet and at least one outlet positioned some distance above the inlet, as well as at least one substantially circular, flexible diaphragm, which diaphragm is movable within the diaphragm housing under the influence of a working liquid to be pressurised, in which the circular outer edge of the diaphragm is clamped down in the diaphragm housing by means of a circular clamping member. According to the invention, the diaphragm pump is characterized in that the circular clamping member is provided, on the circumferential edge thereof, with a flange that extends parallel to the plane formed by the clamping member. Since the circular clamping member is provided with a flange extending in the plane formed by the clamping member, disadvantageous deformation of the diaphragm during the delivery stroke will be prevented, because the deforming diaphragm will come to abut against the flange.
REFERENCES:
patent: 2405734 (1946-08-01), Coe
patent: 3416461 (1968-12-01), McFarland
patent: 4212589 (1980-07-01), Bosio
patent: 4416599 (1983-11-01), De Longchamp
patent: 5620746 (1997-04-01), Snyder, Jr.
patent: 6234677 (2001-05-01), Mogil
patent: 502350 (1952-07-01), None
patent: 0524820 (1993-01-01), None
patent: 2164025 (1973-07-01), None
Jacobson & Holman PLLC
Kershteyn Igor
Weir Minerals Netherlands B.V.
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