Pumps – Expansible chamber type – Mechanically actuated distributor
Reexamination Certificate
2005-02-22
2005-02-22
Freay, Charles G. (Department: 3746)
Pumps
Expansible chamber type
Mechanically actuated distributor
C417S519000, C417S900000, C137S625110
Reexamination Certificate
active
06857861
ABSTRACT:
A pivot pipe for a two-cylinder thick material sludge pump is designed to reduce the rate of wear of the sealing surfaces and flow bores of the pivot pipe and cooperating outlets on the two pump cylinders. As the pivot pipe oscillates from one pump cylinder to the other pump cylinder the contacting sealing surfaces are subjected to abrasion and impact wear. The present invention limits the rate of wear between the contacting sealing surfaces and a portion of the flow bore by fixing monolithic wearing rings on the upstream end of the pivot pipe and on the outlets of the two pump cylinders. The monolithic wearing rings are made of a hard materials such as cemented tungsten carbide.
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“Exposition Directory & Events Schedule” from Construction, Construction Materials and Power Transmission Industries Conexpo, Mar. 19-23, 2002, Las Vegas, NV, USA, Title Page, p. 277 and 2 pages color photos).
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Cavanaugh James
Condon Gary J.
Klingensmith Mark T.
Freay Charles G.
Kennametal Inc.
Smith Matthew W.
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