Air flow directing device

• US 5,069,025 A
• Filed: 03/20/1989
• Issued: 12/03/1991
• Est. Priority Date: 03/20/1989
• Status: Expired due to Fees

• Current Assignee: Ernst W. Iversen
• Original Assignee: Ernst W. Iversen
• Inventors: Iversen, Ernst W.
• Primary Examiner(s): Neuder, William P.
• Application Number:
  US07/325,892
• Time in Patent Office: 988 Days
• Field of Search: 56/13.3, 56/13.4, 56/295
• US Class Current: 56/295
• CPC Class Codes: A01D 34/73 Cutting apparatus

Abstract

A flow directing device for use with rotary blade mowers where the blade is located for rotation in plane generally parallel to a surface to be cut and where the devices within the scope of the present invention include an air flow direction vane having a base located on the underside of the central portion of the blade with upstanding vanes on the leading side of the blade where each of the vanes is tilted inwardly over the blade and has a tip at the edge which is turned outwardly toward the front edge of the blade.

Claims

1. A flow directing device for use with rotary blade mowers having a blade with cutting edges adjacent the tip thereof on the leading edge of said blade and where said blade is located for rotation in a plane generally parallel to a surface to be cut and where a device within the scope of the present invention is provided for rotation with said blade and includes an air flow direction vane to be located on the underside of the central portion of the blade having a base cambered away beneath said blade to provide an air foil to generate a low pressure zone beneath said device when said blade is in rotation and where said blade is provided with upstanding vane means on at least one side of said blade where said vane means are located on the leading edge of said blade inwardly of said cutting edge and wherein said vane means is tilted inwardly over the blade.

2. The invention of claim 1 wherein said upstanding vane has a tip at the edge thereof on the end of said vane located closest to said cutting edge which is turned outwardly toward the leading edge of the blade.

3. The invention of claim 1 including retainer means carried by said base of said device and adapted to extend upwardly from the edges thereof to engage the edges of said blade to prevent independent rotation of said device relative to said blade.