Rotary kinetic fluid motors or pumps – Including casing part selectively movable relative to fixed... – Separate liner portion
Reexamination Certificate
2005-05-03
2005-05-03
Nguyen, Ninh H. (Department: 3745)
Rotary kinetic fluid motors or pumps
Including casing part selectively movable relative to fixed...
Separate liner portion
C415S174100, C415S230000, C415S205000, C415S206000, C415S214100
Reexamination Certificate
active
06887034
ABSTRACT:
A centrifugal pump having an adjustable clean-out assembly (60), the position of which determines the face clearance between a wear plate (72) and an impeller (20). The clean-out assembly includes an end cover (63) that threadedly mounts a plurality of adjustment assemblies. The adjustment assembly includes an adjuster (104) that defines a through bore for slidably receiving a retaining stud (66) that extends from the pump housing. Each adjuster includes an abutment surface (108) which engages a pump surface and which establishes the face clearance between the wear plate and the impeller. Each adjuster includes a hex-shaped head which is engageable by an associated locking member (120) secured to the end cover. Each locking member includes a locking collar (120a) having 18 teeth which allows the collar to engage the hex-shaped head of the adjuster in 18 different postions. By knowing the thread pitch of the adjuster thread, precise rotations of the adjuster can be used to establish a precise clearance between the wear plate and impeller. Once the adjustment is made, the locking collar is secured to the end cover which enables the clean-out assembly to be removed from the pump without disturbing the adjustment.
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1 page sheet of a prior art wear ring adjustment design by The Gorman-Rupp Company that was on sale prior to May 1999.
4 page publication and drawing showing a pump design by WEMCO, publication date unknown, drawing date 1984.
1 page drawing of a prior art submersible pump by The Gorman-Rupp Company that was on sale prior to May 1999.
2 page drawing No. 46127-915of a prior art pump by The Gorman-Rupp Company dated 1990.
1 page drawing of a prior art pump by The Gorman-Rupp Company that was on sale prior to May 1999.
3 page drawing of a prior art pump by The Gorman-Rupp Company that was on sale prior to May 1999.
1 page publication entitled “The bolt stops here,” Machine Design (Nov. 2000).
European Search Report.
Cottrell Eddie D.
Hooker James T.
Keith Michael L.
Mesiter David L.
Nguyen Ninh H.
The Gorman-Rupp Company
Watts & Hoffmann Co.
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