Patent US3780509A successfully refreshed from Google Patents.
US3780509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary lawn mower cutter bar with bi-level cutter
Assignee: Jacobson Manufacturing Co Inc
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Filing: 1973-03-02
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Granted: 1973-12-25
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Expires: 1993-03-02
Abstract
Abstract A rotary lawn mower having an engine and a cutter bar rotated by the engine and having a grass catcher bag for collecting the grass. The cutter bar has a pair of cutters on each opposite end of the bar, and each cutter has a cutting edge on the rotationally leading side of the cutter. The cutters are both vertically and horizontally offset within their pairs, and the upper one of the cutters in each pair is rotationally in advance of the other one of the cutters so that the leading and upper cutter will cut the grass prior to being cut by the trailing and lower cutter, and thus each blade of grass is cut into two short lengths by the bilevel cutter. An air-fanning blade is also included in the cutter bar and creates a flow of air to convey the clippings from the cutter bar and through the outlet of the mower and into the collector bag.
Inventors
- 👤 N Woelffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:53
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/73
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A rotary lawn mower cutter bar adaptable for being horizontally disposed on a lawn mower, comprising an elongated body portion, a pair of grass cutters on each opposite end of said body portion and having cutting edges faced on the respective cutter bar ends in the direction of rotation of said cutter bar and with said cutting edges being on the lowermost portion of said cutters, said cutters which constitute said pairs of grass cutters being offset from each other both horizontally and vertically within each of said pairs and presenting upper and lower said cutting edges within each of said pairs, said upper ones of said cutting edges being rotationally in advance of said lower ones of said cutting edges for cutting the grass at a higher elevation and prior to the time relative to the grass cutting of said lower cutting edges.
Claim 2
Dependent Claim
144 words
A rotary lawn mower cutter bar adaptable for being horizontally disposed on a lawn mower, comprising an elongated body portion, a pair of grass cutters on each opposite end of said body portion and having cutting edges faced on the respective cutter bar ends in the direction of rotation of said cutter bar and with said cutting edges being on the lowermost portion of said cutters, said cutters which constitute said pairs of grass cutters being offset from each other both horizontally and vertically within each of said pairs and presenting upper and lower said cutting edges within each of said pairs, said upper ones of said cutting edges being rotationally in advance of said lower ones of said cutting edges for cutting the grass at a higher elevation and prior to the time relative to the grass cutting of said lower cutting edges.
Claim 3
Dependent Claim
37 words
The cutter bar as claimed in claim 1, including an air-fanning blade included on each opposite end of said cutter bar for creating an upward and circular flow of air during the rotation of said cutter bar.
Claim 4
Dependent Claim
22 words
The cutter bar as claimed in claim 2, wherein said air-fanning blade is affixed with each rotationally trailing one of said cutters.
Claim 5
Dependent Claim
26 words
The cutter bar as claimed in claim 1, wherein said cutting edges are disposed on said cutter bar elevationally offset from each other by one-half inch.
Claim 6
Dependent Claim
58 words
The cutter bar as claimed in claim 1, wherein said cutters are integral extensions of said body portion and are unitary with said body portion, and including an air-fanning blade upstanding on the rotationally trailing end of the rotationally trailing said cutter of each said pair of cutters for upwardly directing the ambient air and the cut grass.
Claim 7
Dependent Claim
47 words
The cutter bar as claimed in claim 1, wherein said cutting edges are disposed at the lowest level of said cutter bar, and said cutters being pitched upwardly from said cutting edges for creating an upward flow of air in response to rotation of said cutter bar.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |