US 4,223,514 A · Knife section

Abstract

An improved knife section for reciprocating mower is disclosed wherein the improved knife section is constructed from less material than a standard knife section. The thickness of the improved knife section is made substantially equal to the thickness of the material of a standard knife section by forming convolutions in the body. A reinforcing ridge parallel to the cutting edge further improves the rigidity and strength of the improved knife section. The reinforcing ridge extends rearwardly beyond the cutting edge to encircle the rivet holes to allow for the inclusion of countersunk areas permitting the rivet heads to fit within the plane of the knife section, thereby producing a substantially uniform top surface. An extension of the countersunk area below the bottom surface of the knife section can interfit an embossed depression formed around the rivet hole in the support bar, resulting in an interlock between the knife section and support bar to reduce shearing stresses within the rivet.

Claims16

Dependent claims

In a knife section for a reciprocating mower having a substantially rectangular base portion defined by a base edge and two opposing non-cutting side edges, said base portion having two spaced apart holes therethrough;

an upper surface;
an opposing lower surface substantially parallel to said upper surface, said lower surface defining a lowermost plane;
and a generally triangularly shaped body portion integral with said base portion, including two converging cutting edges extending, respectively, from said two non-cutting side edges, said body portion being defined at the base thereof by said base portion and defined at the sides thereof by said cutting edges, the improvement comprising:
a reinforcing ridge parallel to each said cutting edge, said reinforcing ridges partially defining an elevated plane above and parallel to said upper surface, each said reinforcing ridge continuing onto said base portion to encompass the respective said hole;
and
a plurality of rounded ribs projecting from said lowermost plane substantially to said elevated plane, said ribs extending from said body portion onto said base portion.

3 more elements

Dependencies are inferred from the claim text.

Knife section

Life of this patent

Knife section

Life of this patent

Abstract

Claims16