US 10,117,380 B1 · Systems and methods for reducing cutting blade noise

Abstract

A cutting blade for use in a lawnmower or other cutting device has a contoured leading edge profile that forms a series of protrusions and contoured notches. Each contoured notch has a surface that is smooth and contoured such that air is funneled through the contoured notch by the adjacent protrusions, thereby causing the air to form vortices at the surface of the blade. The formation of the vortices helps the airflow to adhere to the blade surface rather than separate from it, thereby creating a more laminar streamlined flow that merges with air flowing over the opposite side of the blade at the trailing edge. By preventing the airflow from separating from the blade surface over a substantial portion of the blade, turbulence is significantly reduced. Thus, noise generated by the blade is significantly reduced as well. In addition, the blade experiences less drag, and the performance of the blade and lawnmower is generally increased.

Claims34

Dependent claims

A cutting blade for use with a lawnmower to reduce sound emitted from the lawnmower, comprising:

an elongated body having a top face, a bottom face, a first leading edge, a second leading edge, and a trailing edge, wherein the first leading edge is a first side of the elongated body and is notched thereby forming a plurality of contoured notches and a plurality of protrusions in the first leading edge, the plurality of protrusions including an adjacent pair of protrusions with one of the contoured notches located between the adjacent pair of protrusions, wherein the second leading edge is on a second side of the elongated body, wherein the second side is opposite of the first side, wherein the first leading edge forms a sharp tip along the top face for cutting, wherein a cross-sectional profile of the first leading edge is rounded from the tip to the bottom face, wherein the one contoured notch is shaped such that an airflow induced by movement of the elongated body is channeled through the one contoured notch thereby generating at least one vortex within the airflow such that turbulence in the airflow is reduced, and wherein the elongated body has a hole for receiving a spindle of the lawnmower between the first side and the second side.

Dependencies are inferred from the claim text.

Systems and methods for reducing cutting blade noise

Life of this patent

Systems and methods for reducing cutting blade noise

Life of this patent

Abstract

Claims34