High-efficiency lawn maintenance tool and high-efficiency cutting blade

Patent metadata

Field	Value
Publication number	US-11540441-B2
Application number	US-202017073453-A
Country	US
Kind code	B2
Filing date	Oct 19, 2020
Priority date	Oct 6, 2017
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

A high-efficiency blade for a lawn maintenance tool includes a central axis and a mounting portion located on the central axis. The high-efficiency blade includes a cutting blade and a cutting blade sharpened leading edge. A cleaning blade is vertically offset from the cutting blade and is configured to mulch the associated clippings from vegetation and reduce an associated accumulation of clippings on an underside of an associated mower deck. The lawn maintenance tool can also include a deck having a separation distance between the cleaning blade and an underside of the deck. The deck can include an elevation change to vary the separation distance. The deck and high-efficiency blade can also include a forward or rearward tilt.

First claim

The invention claimed is:

1. A high-efficiency blade for a lawn maintenance tool comprising:
a central axis;
a mounting portion located on the central axis;
a plurality of cutting blades, wherein each cutting blade comprises:
at least one segment;
a cutting blade sharpened leading edge, wherein the cutting blade sharpened leading edge is generally parallel to a driven surface and the cutting blade sharpened leading edge is configured to cut clippings from vegetation; and

a plurality of cleaning blades, wherein each cleaning blade is vertically offset from each of the cutting blades and is configured to mulch the associated clippings from vegetation and reduce an associated accumulation of clippings on an underside of an associated mower deck, and
wherein the plurality of cutting blades and the plurality of cleaning blades are arranged in alternating positions around the mounting portion.

2. The high-efficiency blade according to claim 1 , wherein the cutting blade and the cleaning blade are separate arms that extend from the mounting portion.

3. The high-efficiency blade according to claim 1 , wherein the cleaning blade further comprises a cleaning blade sharpened leading edge.

4. The high-efficiency blade according to claim 3 , wherein the cleaning blade sharpened leading edge is formed at a reverse angle.

5. The high-efficiency blade according to claim 1 , wherein the cleaning blade is configured to be maintained at a relatively close distance from the underside of the associated mower deck.

6. The high-efficiency blade according to claim 1 comprising three cutting blades and three cleaning blades in alternating positions around the mounting portion.

7. The high-efficiency blade according to claim 1 comprising four cutting blades and four cleaning blades in alternating positions around the mounting portion.

8. The high-efficiency blade according to claim 1 , wherein the mounting portion defines a drive aperture and the high-efficiency blade is attached to the lawn maintenance tool with a leaf spring, the leaf spring including drive knobs configured to cooperate with the drive aperture to provide rotational power to the high-efficiency blade.

9. The high-efficiency blade according to claim 1 , wherein high-efficiency blade further comprises:
three arm sections, wherein each arm section includes one cleaning blade and one cutting blade.

10. A high-efficiency lawn maintenance tool comprising:
a frame;
a deck, wherein the deck is attached to the frame and the deck defines a downward facing space;
a high-efficiency blade located within the downward facing space, the high-efficiency blade comprising;
a central axis;
a mounting portion located on the central axis of the high-efficiency blade;
a plurality of cutting blades, wherein each cutting blade comprises:
at least one segment;
a cutting blade sharpened leading edge, wherein the cutting blade sharpened leading edge is configured to cut clippings from vegetation; and

a plurality of cleaning blades, wherein the each cleaning blade is vertically offset from the cutting blade, and wherein the plurality of cutting blades and the plurality of cleaning blades are arranged in alternating positions around the mounting portion;

a power source, wherein the power source is attached to one of the frame or the deck and the power source provides rotational power to the high-efficiency blade; and
a plurality of ground engaging members, wherein the ground engaging members are attached to one of the frame or the deck,
wherein the deck and the high-efficiency blade are tilted such that the central axis is not vertical.

11. The high-efficiency lawn maintenance tool according to claim 10 , wherein the central axis is tilted rearward such that a forward part of the high-efficiency blade is higher than a rearward part of the high-efficiency blade.

12. The high-efficiency lawn maintenance tool according to claim 11 , wherein the central axis is tilted forward such that a forward part of the high-efficiency blade is lower than a rearward part of the high-efficiency blade.

Assignees

• Mtd Products Inc

Inventors

• Schaedler Axel
• Buchanan Peter J

Classifications

• A01D34/733

  Cutting-blade mounting means · CPC title

• A01D34/68

  with motor driven cutters or wheels · CPC title

• A01D34/66

  with two or more cutters · CPC title

• A01D34/005

  Mulching means · CPC title

• A01D34/73 Primary

  Cutting apparatus · CPC title