Patent ID: 9352327
Filing Date: 2016-05-31
CPC Classification: B02C,E03F,F04D

Claim Text:
1. A grinder pump comprising a cutter plate attached to an inlet of the grinder pump; and a cutter blade attached to the grinder pump and located parallel and adjacent to the cutter plate; wherein angled openings extend entirely through the cutter plate and wherein the openings comprise three sides, wherein one side comprises a straight cutting edge, a second side adjacent to the straight cutting edge comprises a concave shaped cutting edge; wherein a third side of the angled openings joins an end of the first side with an end of the second side and consists essentially of a curved convex shaped edge; wherein the cutter plate further comprises relief cuts in a surface of the cutter plate, wherein the cutter blade comprises a pair of angled cutting edges, wherein each angled cutting edge forms an acute angle creating sharp cutting edges, and wherein during operation of the grinder pump, the angled cutting edges of the cutter blade cross the angled openings such that solid material entering said angled openings is forced between the straight cutting edge and the concave shaped cutting edge.