WO1996029853A1 - Lawn mower blade - Google Patents
Lawn mower blade Download PDFInfo
- Publication number
- WO1996029853A1 WO1996029853A1 PCT/CA1996/000197 CA9600197W WO9629853A1 WO 1996029853 A1 WO1996029853 A1 WO 1996029853A1 CA 9600197 W CA9600197 W CA 9600197W WO 9629853 A1 WO9629853 A1 WO 9629853A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blade
- tine
- tines
- leading
- plane
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/73—Cutting apparatus
Definitions
- This invention relates to a lawn mower blade.
- This invention relates particularly to a modified lawn mower blade for a rotary mower.
- Existing rotary blades are composed of a flat piece of steel whose opposite ends are slightly turned and whose leading edge near each end is a bevel to the blade which acts as a cutting element to the grass.
- the blade rotates by being removably attached as by bolts to the rotary shaft of a two or four cycle engine.
- a great amount of grass is ejected from the side-shoot, clutters the ground with grass clippings making the cut grass unesthetically looking. It generally is raked or bagged in order to improve appearance.
- a lawn mower blade particularly suited for a rotary lawn mower is provided with at least two end tines at opposite ends. Each tine has a forward bevelled cutting surface. The rear most and lowest most end tines are in a common (lowest) plane while all other tines are respectively forward thereof and in planes above the common plane. There are preferably three tines at each end which, on rotation, trace out a grass cutting annulus. The tines rotate in this annulus, chopping up the grass cuttings into small pieces virtually consuming them. The cut grass clippings thus are not accumulated to the underside of the lawn mower deck and then fall as clumps to leave an unsightly mess on the ground.
- the invention in its broadest aspect, contemplates a lawnmower cutting blade for rotary lawn mower, having a primer mover with a rotary shaft, the blade comprising a single integral elongated member being the blade defining means for attachment of the blade to the rotary shaft of the prime mover, the blade defining; at each opposite end, at least two spatially disposed tines, one time positioned forward of a rearward tine, each tine having a bevelled leading edge that acts as a cutting element against grass to be cut, during rotation by the prime mover, each of the rearmost tines at opposite ends being relatively co-incident and in a lowest elevational plane; each forward tine at either end being at an elevation and in a plane that is above that of the lowest plane.
- the forward tines are in a plane different from each other and at a higher elevation than the rearmost tines.
- a pair of leading tines in advance of each opposite ended, most forward tine preferably located at an elevation wherein the leading tine at one end is at an elevation intermediate the leading and forward tine at the opposite end and further, that each of the leading and forward tines are at different elevations relative to the rearmost co- planar tines.
- each of the tines should have its end bevelled to provide a second cutting element to each tine.
- Figure 1 is a perspective view of a lawn mower according to the prior art and Figure 1A is a lawn mower blade of the prior art used with the lawn mower of Figure 1;
- FIG 2 is a perspective view of the cutting operation of the lawn mower of Figure 1 but incorporating the novel blade of this invention
- Figure 2A is a perspective view of my novel blade
- Figure 3 is an explanatory respective in perspective view of the cutting sequences of the cutting elements according to my novel lawn mower blade.
- FIG. 4 is a diagrammatic representation of the cutting sequences according to my invention.
- Figure 5 is a top plan view of my novel blade
- Figure 6 is a side elevational view of the blade of Figure 5;
- Figures 7A and 7B respectively are opposite end elevational views of the blade ends.
- a lawn mower (10) is shown with a gas engine (12) mounted on the top thereof, the shaft, extending vertically downward through the lawn mower deck (14) .
- a lawn mower blade (15) removably bolted and as those skilled in the art will know.
- my novel lawn mower blade (20) consists of a central bar portion (21) with opposite distal ends tined into three axially aligned tines, each at a different elevation relative to the plane of the longitudinal central axis (A) of the blade (20) .
- tine (23) is co-incident with the longitudinal axial plane (A) of the blade and both tines (22) , at a given distance beneath that and co ⁇ incident to each other, as more clearly seen in Figures 7A and 7B and hence, reside on the cutting line (O) , shown in Figures 3 and 6.
- the various cutting distances of each of the tines is illustrated in Figure 3, from the lowest cutting blade tine (22) along a plane (0) and with reference to Figures 3 and 4 it clearly illustrates that as the lawn mower blade (20) goes through its clockwise turning cycle during grass cutting, tine (26) , engages the grass first, thereafter tine (25) , thereafter tine (24) , thereafter tine (23) and thereafter, tines (22) .
- Each of the upper tines (26) through (23) cut the grass, as seen in Figure 4, at a different elevation from the base plane (0) which is cut by the two end tines (22) and which respective tines is the rearmost tine in each tine end set.
- the actual length of a cut blade of grass is the distance between the tine, i.e., selectively the distance between (H 4 ) minus (H 2 ) at the distance of the cut between tines (24) and (26) ; hence, repeatedly, as it relates to all other tines.
- the length of grass above (H 4 ) will also tend to be cut by the swirling action between deck and blade, as the blade (20) whirls under the deck to cut the grass.
- the resultant grass cuttings, from my novel blade (20) are so small as to not "overcover" cut grass to make it unsightly.
- the length of the clippings of each cut segment of a blade of grass is dependent on the height from the base plane (O) of each tine, tines (22) being at the base plane (0) , while others are in elevation therefrom, i.e., tines (23) through (26) and organized in a sequential cutting order for their respective cuts.
- each tine has a depth or width of approximately 1 inch so the total width of the lawn mower blade (20) is approximately 3 inches.
- the length (see Figure 6) of each cutting tine (22) through (26) is about 3 inches for a 21 inch long lawn mower blade (20) .
- the cutting edge (22') of the trailing tines (22) trail and are co-incident with the lowest or base plane elevation (O) at each end so as to be the last cutting blade during each rotation. This ensures a smooth cutting of the grass.
- each tine (22) through (26) should also be bevelled so as to provide an additional cutting element or surface. They are respectively shown in the figures as cutting edges (22") , (25") and (26") , it being noted that tines (23) and (24) are also end bevelled but not referenced.
- this novel blade when viewed by strobe light eliminates the circumferential collection of grass against the underskirt of the deck of a lawn mower which generally occurs during normal cutting and is accentuated when the grass is damp.
- this collection of grass onto the under inner skirt of the deck causes ball-like clumps of cut grass to collect, then to fall periodically during cutting and to be scattered over the lawn; while with my novel blade, as aforesaid described, the accumulation of grass on the under inner surfaces of the deck and deck skirt is virtually eliminated. The sporadic deposition of ball- like clumped cut grass clippings is avoided.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Harvester Elements (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96907977A EP0817562A1 (en) | 1995-03-27 | 1996-03-22 | Lawn mower blade |
AU51407/96A AU5140796A (en) | 1995-03-27 | 1996-03-22 | Lawn mower blade |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2,145,557 | 1995-03-27 | ||
CA002145557A CA2145557A1 (en) | 1995-03-27 | 1995-03-27 | Lawn mower blade |
US08/441,422 US5619846A (en) | 1995-03-27 | 1995-05-15 | Lawn mower blade |
US08/441,422 | 1995-05-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996029853A1 true WO1996029853A1 (en) | 1996-10-03 |
Family
ID=25677861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA1996/000197 WO1996029853A1 (en) | 1995-03-27 | 1996-03-22 | Lawn mower blade |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0817562A1 (en) |
AU (1) | AU5140796A (en) |
WO (1) | WO1996029853A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999030551A1 (en) * | 1997-12-04 | 1999-06-24 | Mats Fischier i Båstad AB | Rotor assembly and lawnmower having such a rotor assembly for cutting grass at a plurality of levels |
EP0963692A1 (en) * | 1998-06-08 | 1999-12-15 | Osvaldo R. Quiroga | Improved rotary mower apparatus |
US6038842A (en) * | 1996-02-26 | 2000-03-21 | Quiroga; Osvaldo R. | Rotary mower apparatus |
KR101345034B1 (en) | 2012-06-28 | 2013-12-26 | 이의덕 | Balde of grass mower |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3703071A (en) * | 1972-02-17 | 1972-11-21 | Charles I Anderson | Rotary blade for mulching lawn mower |
USRE27647E (en) * | 1970-11-23 | 1973-05-29 | Mower cutting device | |
US3780509A (en) * | 1973-03-02 | 1973-12-25 | Jacobson Manuf Co | Rotary lawn mower cutter bar with bi-level cutter |
US4351144A (en) * | 1979-06-22 | 1982-09-28 | Salvatore Benenati | Comminuting powered lawn mower |
GB2170086A (en) * | 1985-01-25 | 1986-07-30 | Vogelenzang Alexander J | Bruising and conditioning arrangement for a rotary mower |
US5199251A (en) * | 1991-12-19 | 1993-04-06 | Snapper Power Equipment Division Of Fuqua Industries, Inc. | Mulching blade including multiple cutting edges |
US5321940A (en) * | 1993-02-16 | 1994-06-21 | Lloyd Peterson | Multi-edge mower blade |
-
1996
- 1996-03-22 WO PCT/CA1996/000197 patent/WO1996029853A1/en not_active Application Discontinuation
- 1996-03-22 EP EP96907977A patent/EP0817562A1/en not_active Ceased
- 1996-03-22 AU AU51407/96A patent/AU5140796A/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE27647E (en) * | 1970-11-23 | 1973-05-29 | Mower cutting device | |
US3703071A (en) * | 1972-02-17 | 1972-11-21 | Charles I Anderson | Rotary blade for mulching lawn mower |
US3780509A (en) * | 1973-03-02 | 1973-12-25 | Jacobson Manuf Co | Rotary lawn mower cutter bar with bi-level cutter |
US4351144A (en) * | 1979-06-22 | 1982-09-28 | Salvatore Benenati | Comminuting powered lawn mower |
GB2170086A (en) * | 1985-01-25 | 1986-07-30 | Vogelenzang Alexander J | Bruising and conditioning arrangement for a rotary mower |
US5199251A (en) * | 1991-12-19 | 1993-04-06 | Snapper Power Equipment Division Of Fuqua Industries, Inc. | Mulching blade including multiple cutting edges |
US5321940A (en) * | 1993-02-16 | 1994-06-21 | Lloyd Peterson | Multi-edge mower blade |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6038842A (en) * | 1996-02-26 | 2000-03-21 | Quiroga; Osvaldo R. | Rotary mower apparatus |
WO1999030551A1 (en) * | 1997-12-04 | 1999-06-24 | Mats Fischier i Båstad AB | Rotor assembly and lawnmower having such a rotor assembly for cutting grass at a plurality of levels |
US6269621B1 (en) | 1997-12-04 | 2001-08-07 | Mats Fischier i Båstad AB | Rotor assembly and lawnmower having such a rotor assembly for cutting grass at a plurality of levels |
EP0963692A1 (en) * | 1998-06-08 | 1999-12-15 | Osvaldo R. Quiroga | Improved rotary mower apparatus |
KR101345034B1 (en) | 2012-06-28 | 2013-12-26 | 이의덕 | Balde of grass mower |
Also Published As
Publication number | Publication date |
---|---|
AU5140796A (en) | 1996-10-16 |
EP0817562A1 (en) | 1998-01-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5619846A (en) | Lawn mower blade | |
US6487840B1 (en) | Combined mulching and shredding blade | |
EP1277386B1 (en) | Mower blade | |
US4245456A (en) | Rotary lawnmower with grass clearing means | |
DE1457944A1 (en) | Circumferential safety plant cutting knife | |
EP0271672B1 (en) | Spindle mower | |
US4977735A (en) | Lawn sculpturing method and apparatus | |
CA2494903A1 (en) | Twisted and self-sharpening lawn equipment blades | |
US4774803A (en) | Snow and leaf throwing blades | |
EP0817562A1 (en) | Lawn mower blade | |
US20060150608A1 (en) | Cylinder lawn mower and cylinder unit intended therefor | |
DE60100061T2 (en) | mulching mower | |
EP1541007B1 (en) | Method and apparatus for cutting and mulching of in particular high grown grass cuttings | |
EP1181858B1 (en) | Mowing and mulching system for lawnmower | |
EP3130214A1 (en) | Mowing and conveyor apparatus for harvesting stalk crops | |
US5398490A (en) | Endless cutting head for lawn mower | |
DE202015005648U1 (en) | Mowing and conveying device for harvesting stemmed crops | |
CN211831928U (en) | High-efficient grass cutting device | |
DE10319032B3 (en) | Mowing and mulching blades and their arrangement in sickle mowers | |
US5377480A (en) | Apparatus for cutting down elongated standing crops, particularly stalk material | |
DE10042086B4 (en) | Mowing and mulching machine for lawnmowers | |
DE10135656B4 (en) | Mowing and mulching system for lawnmowers | |
DE69812327T2 (en) | Rotary mower | |
WO1997049276A1 (en) | Cutting system for rotary lawn mower | |
GB2327588A (en) | Apparatus for treating crops |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AL AM AT AU AZ BB BG BR BY CH CN CZ DE DK EE ES FI GB GE HU IS JP KE KG KP KR KZ LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TR TT UA UG UZ VN AM AZ BY KG KZ MD RU TJ TM |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): KE LS MW SD SZ UG AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1996907977 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1996907977 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWR | Wipo information: refused in national office |
Ref document number: 1996907977 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1996907977 Country of ref document: EP |