US4030275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary mower
Assignee: Maschinenfabrik Fahr AG
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Filing: 1976-01-12
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Granted: 1977-06-21
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Expires: 1996-01-12
Abstract
Abstract A rotary mower has a cylindrical drum rotatable about its upright vertical axis and provided at its lower end with a downwardly and outwardly flared skirt provided on its lower side with radially projecting crop-cutting blades and on its upper side with crop-displacing ridges. A windrow-forming deflecting plate is fixed on the support of the mower adjacent the drum and has a lower edge parallel to the upper surface of the skirt and forming on juxtaposition of this lower edge with the leading edge of each of the crop-displacing ridges an outwardly open acute angle. The ridge may be pressed into the skirt or constituted as a bar secured to the top thereof and has a circularly arcuate leading edge that passes under the straight lower edge of the deflecting plate.
Inventors
- 👤 Hermann Ruprecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:45
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/64; A01D34/66; A01D34/667; A01D57/00; A01D57/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A rotary mower comprising: a support displaceable along the ground; a drum suspended from said support and rotatable relative thereto about an upright axis in a rotation sense; a downwardly flared skirt on said drum; a deflector plate secured to said support and having a lower edge spaced above and extending generally parallel to said skirt; a ridge on said skirt displaceable on rotation of said drum underneath said lower edge, said ridge having a leading edge sweeping past said plate on rotation of said drum and juxtaposable with said lower edge, said edges including an acute angle between them upon juxtaposition of said edges; and at least one blade secured to said skirt and extending generally radially therefrom.
Claim 2
Dependent Claim
119 words
A rotary mower comprising: a support displaceable along the ground; a drum suspended from said support and rotatable relative thereto about an upright axis in a rotation sense; a downwardly flared skirt on said drum; a deflector plate secured to said support and having a lower edge spaced above and extending generally parallel to said skirt; a ridge on said skirt displaceable on rotation of said drum underneath said lower edge, said ridge having a leading edge sweeping past said plate on rotation of said drum and juxtaposable with said lower edge, said edges including an acute angle between them upon juxtaposition of said edges; and at least one blade secured to said skirt and extending generally radially therefrom.
Claim 3
Dependent Claim
35 words
The mower defined in claim 1 wherein at least one of said edges is so shaped that on passage of said leading edge under said lower edge, said edges always form substantially the same angle.
Claim 4
Dependent Claim
149 words
A rotary mower comprising: a support displaceable along the ground; a drum suspended from said support and rotatable relative thereto about an upright axis in a rotation sense; a downwardly flared skirt on said drum; a deflector plate secured to said support and having a lower edge spaced above and extending generally parallel to said skirt; a ridge on said skirt displaceable on rotation of said drum underneath said lower edge, said ridge having a forwardly convex leading edge sweeping past said plate on rotation of said drum and juxtaposable with said lower edge, said edges including an acute angle between them upon juxtaposition of said edges; and at least one blade secured to said skirt and extending generally radially therefrom, at least one of said edges being so shaped that on passage of said leading edge under said lower edge, said edges always form substantially the same angle.
Claim 5
Dependent Claim
149 words
A rotary mower comprising: a support displaceable along the ground; a drum suspended from said support and rotatable relative thereto about an upright axis in a rotation sense; a downwardly flared skirt on said drum; a deflector plate secured to said support and having a lower edge spaced above and extending generally parallel to said skirt; a ridge on said skirt displaceable on rotation of said drum underneath said lower edge, said ridge having a forwardly convex leading edge sweeping past said plate on rotation of said drum and juxtaposable with said lower edge, said edges including an acute angle between them upon juxtaposition of said edges; and at least one blade secured to said skirt and extending generally radially therefrom, at least one of said edges being so shaped that on passage of said leading edge under said lower edge, said edges always form substantially the same angle.
Claim 6
Dependent Claim
18 words
The mower defined in claim 3 wherein a continuation of said leading edge is tangential to said drum.
Claim 7
Dependent Claim
13 words
The mower defined in claim 3 wherein said leading edge is circularly arcuate.
Claim 8
Dependent Claim
12 words
The mower defined in claim 3 wherein said lower edge is straight.
Claim 9
Dependent Claim
19 words
The mower defined in claim 3 wherein said ridge is formed by a rigid element secured to said skirt.
Claim 10
Dependent Claim
14 words
The mower defined in claim 3 wherein said ridge is integral with said skirt.
Claim 11
Dependent Claim
28 words
The mower defined in claim 3 wherein said plate has an upright edge parallel to said drum and to said axis and bent cylindrically back in said sense.
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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |