Board of Trustees of the University of Alabama, for and on behalf of the University of Alabama in Huntsville
发明人:
Kaukler William,Thompson Wayne
申请号：
US201615156016
公开号：
US10117380(B1)
申请日:
2016.05.16
申请国别(地区):
美国
年份:
2018
代理人:
Maynard Cooper & Gale, P.C. `Holland Jon E.
摘要：
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.
