Fill pump piston centering support

Details Fill pump piston centering support Fill pump piston centering support

2005-03-29

2005-03-29

Lopez, F. Daniel (Department: 3745)

Expansible chamber devices

Collapsible chamber wall portion

Wall portion formed of flexible material

C092S178000

Reexamination Certificate

active

06871577

ABSTRACT:
A centering support for a piston in a piston-type pump having a diaphragm extending between the piston and the cylinder to define a product end of the pump and a driven end of the pump includes at least three equally radially spaced, centering elements extending radially outwardly from the piston for contacting the cylinder wall. The centering elements define a gap between the piston and the cylinder wall. The centering elements are disposed on the piston spaced from the diaphragm at the product end of the pump.

REFERENCES:
patent: 2952218 (1960-09-01), Steffes
patent: 4268042 (1981-05-01), Borlan
patent: 4286932 (1981-09-01), Nagano et al.

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