Diaphragm assembly for a pump

Expansible chamber devices – Collapsible chamber wall portion – Wall portion formed of flexible material

Reexamination Certificate

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Reexamination Certificate

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07424847

ABSTRACT:
A diaphragm assembly is provided which includes one or more pistons and a frame circumscribing the piston or pistons. The diaphragm assembly is useful with a wobble plate pump. The piston or pistons and frame are made of different materials. For example, the piston is made of a material that has a greater stiffness, hardness or rigidity than the material of which the frame is made. The piston will not undergo substantially ballooning over long term use of the diaphragm assembly.

REFERENCES:
patent: 4153391 (1979-05-01), Hartley
patent: 4597151 (1986-07-01), Zaghi et al.
patent: 4610605 (1986-09-01), Hartley
patent: 5632607 (1997-05-01), Popescu et al.
patent: 5791882 (1998-08-01), Stucker et al.
patent: 6048183 (2000-04-01), Meza
patent: 6126403 (2000-10-01), Yamada
patent: 6138550 (2000-10-01), Fingar et al.
patent: 6824139 (2004-11-01), Barinaga et al.
patent: 6883417 (2005-04-01), Headley et al.
patent: 2005/0177201 (2005-08-01), Freeman

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