Patent US4135351A successfully refreshed from Google Patents.
US4135351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary lawn mower grass mulcher
Assignee: Jacobsen Manufacturing Co
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Filing: 1977-07-01
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Granted: 1979-01-23
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Expires: 1997-07-01
Abstract
Abstract A rotary lawn mower grass mulcher assembly having a mower housing with a discharge opening over which two plates are disposed with each plate having airholes extending therethrough and with the holes being aligned offset between the two plates. Air is permitted to escape through the holes, but grass and like debris does not have free passage through the holes, and thus the mulcher assembly causes the grass clippings to remain in the mower housing for mulching or recutting action. The two plates are assembled together, and the plates are spaced apart with one thereof toward the outer end of the housing opening being angled downwardly and outwardly, all for permitting the passage of air but deflecting any debris downward to the ground.
Inventors
- 👤 Sahag C. Akgulian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:30
CPC Classifications
A; A01; A01D; A01D42/00; A01D42/005; A01D2101/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
204 words
A rotary lawn mower grass mulcher comprising a mower housing having a grass outlet through which the cut grass is discharged, a grass mulcher assembly removably attached to said housing and extending across said grass outlet and including a first and a second mulcher plate, said assembly including a first mulcher plate extending across said outlet for initially blocking the discharge of cut grass and having a plurality of holes extending therethrough for the passage of air from said housing, and said assembly including a second mulcher plate attached to said first mulcher plate and extending spaced therefrom and having holes extending therethrough in positions with the axes therof offset from the axes of said holes of said first mulcher plate for further and secondarily blocking the discharge of any cut grass coming through said first mulcher plate while having air pass from said housing and through said holes in said second mulcher plate, and with said mulcher plates thereby retaining said cut grass in said housing for mulching the cut grass, said second mulcher plate having inturned ends which present edges in contact with said first mulcher plate at all of the edges of said second mulcher plate except the lower edge thereof.
Claim 2
Dependent Claim
204 words
A rotary lawn mower grass mulcher comprising a mower housing having a grass outlet through which the cut grass is discharged, a grass mulcher assembly removably attached to said housing and extending across said grass outlet and including a first and a second mulcher plate, said assembly including a first mulcher plate extending across said outlet for initially blocking the discharge of cut grass and having a plurality of holes extending therethrough for the passage of air from said housing, and said assembly including a second mulcher plate attached to said first mulcher plate and extending spaced therefrom and having holes extending therethrough in positions with the axes therof offset from the axes of said holes of said first mulcher plate for further and secondarily blocking the discharge of any cut grass coming through said first mulcher plate while having air pass from said housing and through said holes in said second mulcher plate, and with said mulcher plates thereby retaining said cut grass in said housing for mulching the cut grass, said second mulcher plate having inturned ends which present edges in contact with said first mulcher plate at all of the edges of said second mulcher plate except the lower edge thereof.
Claim 3
Dependent Claim
44 words
The rotary lawn mower grass mulcher as claimed in claim 1, wherein said second mulcher plate extends spaced from said first mulcher plate at an angle thereto, for disposing said holes in said plates with the respective axes of said holes at different angles.
Claim 4
Dependent Claim
44 words
The rotary lawn mower grass mulcher as claimed in claim 2, wherein the angle between said plates is such that at least one of said plates is angled outwardly from its upper portion and relative to the direction of the discharge from said housing.
Claim 5
Dependent Claim
44 words
The rotary lawn mower grass mulcher as claimed in claim 1, wherein said first plate is disposed in an upright plane across said opening, and said second plate is disposed angled down and outwardly relative to the direction of the discharge from said housing.
Claim 6
Dependent Claim
80 words
The rotary lawn mower grass mulcher as claimed in claim 1, wherein said first plate is disposed in an upright plane across said outlet, and said second plate is multi-sided with one side thereof disposed angled down and outwardly relative to the direction of the discharge from said housing, and the other of the sides of said second plate being angled toward and into contact with said first plate, and removable fasteners for removably connecting said assembly to said housing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |