Patent Publication Number: US-2016242355-A1

Title: Lawn Mower Blade and Blade Holder

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     Application Ser. No. 12/930,813 
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Federally sponsored research was not used in the development of this product 
     BACKGROUND OF THE INVENTION 
     The first lawnmower was patented in 1830 in England for cutting grass on sports grounds and extensive gardens. The first reel-type to receive a patent was in 1868 in the United States. In 1929 a power rotary lawnmower with blades that were driven horizontally was introduced. This created a very close cut. In 1938, Toro launched a power mower for the homeowner. More recently lawnmowers have been designed with riding capabilities, multiple blade decks, and more powerful gasoline engines. The cutting blades of a lawnmower are important, but the sharpness of them is often overlooked. The operator may not have the tools or desire to change the blades often to maintain a sharp cutting edge. When a blade is sharp it will do a better job of cutting the grass more evenly, leaving a nicer appearance and lessens susceptibility to diseases. 
     BRIEF SUMMARY OF THE INVENTION 
     Some examples may provide quick-change blade systems allowing the user to make changes on a lawnmower quick and easy. 
     Some examples will use blades designed to be used with a corresponding blade holder that will allow an operator to change blades with little effort. 
     Some may require simple tools or no tools at all. 
     The blade change system may be used on new or retrofit existing lawnmowers. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
       Having thus described the invention in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale. 
       Page 1/5—complete unit of the blade holder and blade 
         FIG. 1A  on page 1/5—curved blade 
         FIG. 1B  on page 1/5—blade holder 
         FIG. 1C  on page 1/5—drive coupling 
       Page 2/5—the blade holder 
         FIG. 2A  on page 2/5—grooves of the blade holder 
         FIG. 2B  on page 2/5—the locking pin 
         FIG. 2C  on page 2/5—the center line-up bushing 
         FIG. 3  on page 3/5—locking mechanism cover 
         FIG. 4  on page 3/5—spring for locking mechanism 
         FIG. 5  on page 3/5—locking pin 
       Page 4/5—the drive coupling that attaches to the rotatable shaft and blade holder 
       Page 5/5—the blade designed to be used with the blade holder 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     This invention will make changing a lawn mower blade easy and safe. There are two parts to the invention. A blade holder which is designed to accept the lawn mower blade and a lawn mower blade that is designed with a curved cutting edge. When the blade comes in contact with the grass there will be a sharp cutting action. This will cut easier and give a smoother cut. After the initial blade holder installation, the lawn mower blade can be put on or taken off of the lawn mower without any tools. 
     A blade holder fabricated from steel will be attached to a rotatable shaft on the lawn mower. A center bushing will allow the lawn mower blade to rotate into the grooves of the blade holder to hold the lawn mower blade on the blade holder. A locking pin will secure the lawn mower blade on to the blade holder. 
     To install blade to the lawn blade holder simply line up the blade to the center line up bushing twist into block holding grooves until secured by locking pin. The locking pin will snap into position. 
     To remove the lawn mower blade for sharpening or changing simply push in the locking pin and twist the lawn mower blade out of the blade holder grooves and the blade will eject. No tools required.