Mower blade

• US 6,675,569 B2
• Filed: 05/08/2002
• Issued: 01/13/2004
• Est. Priority Date: 05/08/2002
• Status: Expired due to Term

• Current Assignee: Oregon Tool Incorporated
• Original Assignee: Frederick Manufacturing Corporation (Oregon Tool Incorporated)
• Inventors: Voss, Paul T., Mannon, N. Kevin
• Primary Examiner(s): PEZZUTO, ROBERT ERIC
• Application Number:
  US10/142,246
• Publication Number:
  US 20030209000A1
• Time in Patent Office: 615 Days
• Field of Search: 562/55, 562/95, 56/175, 565/03, 56D/IG.17, 56D/IG.20
• US Class Current: 56/295
• CPC Class Codes: A01D 2101/00 Lawn-mowers
• CPC Class Codes: A01D 34/005 Mulching means
• CPC Class Codes: A01D 34/73 Cutting apparatus

Abstract

A blade for mounting to a rotary mower. The blade has a beveled cutting leading edge and a trailing edge. The mower has a deck providing an over cover for the blade. The trailing edge of the blade is provided with an upwardly directed ramp at the outermost end of the trailing edge and deflects air flow upwardly inside the deck. Mulching teeth inwardly of the ramp produce a mulching action when desired. The combination mower blade has the feature of assisting the filling of a grass catching bag and alternatively has the feature of mulching the mown grass as desired.

Claims

1. A blade for mounting on a rotary mower comprising

an elongate flat blade defining a plane and having opposed end edges and opposed side edges, said blade adapted for mounting onto a rotary mower for rotation about a center axis extended perpendicular to the plane and separating the blade into opposed elongate end portions extended from said center axis;

said blade as rotated about said axis defining a leading side edge portion and a trailing side edge portion for each elongate end portion, each of said leading side edge portions formed into a cutting edge extended from the end edge inwardly a determined distance from said end edge;

said trailing edge of each elongate end portion configured to have a ramp portion and a teeth portion, said teeth portion including a plurality of teeth formed by rearwardly extended segments, each segment raised from the plane of the blade and twisted to present a forwardly directed tooth edge whereby grass cut by the leading cutting edge is re-cut by said teeth in a mulching operation, said ramp portion including an upwardly angled and non-twisted segment of said trailing edge providing a ramping surface for deflecting air and cut grass in an upward direction.

2. A blade as defined in claim 1 wherein said ramp portion is extended from each of said end edges inwardly a second determined distance from said end edges and said teeth portions are proximal to said ramp portion and extended inwardly therefrom a third determined distance.

3. A blade as defined in claim 2 wherein a mounting hole is provided at the blade center and the center of the hole defines the axis of rotation.

4. A blade as defined in claim 2 wherein the teeth are formed and angled in an outward direction from said axis and bent upwardly and inwardly to produce said cutting edges of said teeth to be directed in a forward direction.

5. A blade as defined in claim 4 wherein the teeth are extended upward of said plane at an angle of about 60 degrees.

6. A blade as defined in claim 2 wherein the ramp is extended upward of said plane at an angle of about 20 degrees.

7. A blade as defined in claim 2 wherein said second distance is at least one inch.

8. In combination, a rotary mower housing and a mower blade rotatably mounted to said housing which comprises:

a rotary mower deck;

a mower blade rotatably mounted at a center position in the deck and defining opposed blade ends, said deck forming a cover over the blade and defining a peripheral skirt portion, said blade extended from its center mounting to the peripheral skirt portion at each blade end;

said blade defining a plane and having leading and trailing edges, a cutting edge formed at least on the outermost portion of the leading edge at each blade end whereat grass cutting takes place;

mulching teeth formed on the trailing edge of the blade and behind the cutting edge for mulching grass severed by said cutting edges, said teeth formed by rearwardly extended segments, each segment raised from the plane of the blade and twisted to present a forwardly directed tooth edge; and

a ramp portion formed on the trailing edges in proximal relation to said mulching teeth, said ramp portion provided by an upwardly angled and non-twisted segment of said trailing edge.

9. A combination as defined in claim 8 wherein an outermost portion of the blade ends is configured to form the upwardly angled ramp portion at the trailing edge to upwardly direct air flow for assisting bagging of the cut grass and alternately for inducing a swirling action for mulching.

10. A combination as defined in claim 8 wherein the upwardly angled ramp portion extends from an outermost end of the blade inwardly to at least an inch along the blade, said mulching teeth provided inwardly and proximal to said ramp portion.