Appeal No. 2006-0962 4
Application No. 10/117,981
including a bowl portion for receiving the impeller and an inlet
side for intake of material into the pump bowl, an intake or
suction cover plate (21) mounted at the inlet side of the pump
casing and having an inlet aperture (32), wherein the edges of
the spiral blade are located closely adjacent the inner surface
of the intake plate facing the pump bowl. As seen in Figures 2,
3 and 5, the inner surface of the intake plate (21) includes a
plurality of inclined grooves (50) which are intended to
cooperate with the sharp edge (46) of the impeller vane (42) to
provide a cutting or shearing function on solids, including
stringy or rubbery materials, contained in the sludge. In
addition to the shearing function associated with the grooves
(50), it is indicated that they are inclined at a steep angle
with respect to the blade so that the grooves and spiral blade
cooperate together to force to the periphery any solids which
might otherwise jam between the blade and the intake plate (21).
It is specifically noted at page 2, column 1, lines 51-54, the
shown embodiment of Hartman’s pump gives it the unique ability to
handle solids without clogging and that the positive cutting or
shearing feature of the pump allows it to handle rope, rags,
rubber, etc., without difficulty.
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Last modified: November 3, 2007