Self-cleaning mower blade assembly

• US 9,930,829 B2
• Filed: 05/27/2016
• Issued: 04/03/2018
• Est. Priority Date: 05/27/2015
• Status: Active Grant

• Current Assignee: Mtd Products Incorporated (Stanley Black & Decker, Inc.)
• Original Assignee: Mtd Products Incorporated (Stanley Black & Decker, Inc.)
• Inventors: Schaedler, Axel
• Primary Examiner(s): Will, Thomas B
• Assistant Examiner(s): Nguyen, Mai T
• Application Number:
  US15/166,378
• Publication Number:
  US 20160345490A1
• Time in Patent Office: 676 Days
• Field of Search: 56 175, 56255, 56295, 56DIG 19, 56DIG 20
• CPC Class Codes: A01D 2101/00 Lawn-mowers
• CPC Class Codes: A01D 34/003 Means for cleaning the machine
• CPC Class Codes: A01D 34/665 modular
• CPC Class Codes: A01D 34/73 Cutting apparatus
• CPC Class Codes: A01D 34/826 Noise reduction means

Abstract

A self-cleaning, energy efficient blade assembly for use on lawn maintenance equipment and devices is provided. The blade assembly includes a shell and plurality of blades releasably attachable to the shell, wherein the shell is generally bowl-shaped. The blade assembly may also include a stabilizer ring that is positioned immediately adjacent to the shell for added structural rigidity and strength.

Claims

1. A mower blade assembly comprising:

a curved shell having a disc portion and a receiving portion, wherein said receiving portion extends from said disc portion and is positioned below the disc portion, said shell further including a curved portion extending from said receiving portion, said curved portion having an inverted U-shape;

and a plurality of blades releasably attachable to said receiving portion of said shell

wherein rotation of said shell generates a boundary layer of air between said blades and said curved portion of said shell, and said boundary layer of air creates a localized high pressure area which causes air to flow radially outward from said shell.

2. The mower blade assembly of claim 1, wherein said curved shell further includes an edge portion extending substantially perpendicular relative to said disc portion, said receiving portion extending from said edge portion in a generally parallel manner relative to said disc portion.

3. The mower blade assembly of claim 1, wherein said curved shell includes a plurality of spaced-apart attachment mechanisms at which said plurality of blades are attachable to said shell.

4. The mower blade assembly of claim 1, wherein said shell includes two or more attachment mechanisms, each of said plurality of blades being attachable to said shell at one of said attachment mechanisms.

5. The mower blade assembly of claim 1, wherein said plurality of blades are attachable to said shell in an equally spaced-apart manner.

9. The mower blade assembly of claim 1, wherein each of said plurality of blades is Z-shaped.

10. The mower blade assembly of claim 1, wherein each of said plurality of blades includes a first end portion attachable to said shell, an angled portion extending from said first end portion at an angle thereto, and a second end portion extending from said angled portion and generally oriented parallel to said first end portion.

11. The mower blade assembly of claim 10, wherein at least a portion of adjacent edges of said angled portion and said second end portion of each of said plurality of blades are sharpened to allow for cutting.

6. A mower blade assembly comprising:

a curved shell having a disc portion and a receiving portion, wherein said receiving portion extends from said disc portion and is positioned below the disc portion, said shell further including a curved portion extending from said receiving portion, said curved portion having an inverted U-shape;

and a plurality of blades releasably attachable to said receiving portion of said shell;

wherein said curved shell includes an outer radial lip, and each of said plurality of blades includes a blade tip that is spaced-apart from said lip and located radially within said lip.

7. A mower blade assembly comprising:

a curved shell having a disc portion and a receiving portion, wherein said receiving portion extends from said disc portion and is positioned below the disc portion, said shell further including a curved portion extending from said receiving portion, said curved portion having an inverted U-shape;

and a plurality of blades releasably attachable to said receiving portion of said shell;

further comprising a stabilizer ring operatively connected to said shell, wherein said plurality of blades are attached to said shell and said stabilizer ring.

8. The mower blade assembly of claim 7, wherein said shell and said stabilizer ring include a plurality of alignable apertures to provide a plurality of equally spaced-apart attachment mechanisms to which each of said plurality of blades is attachable to said shell and said stabilizer ring.