US4235069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for mowing crop
Assignee: Multinorm BV
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Filing: 1979-11-08
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Granted: 1980-11-25
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Expires: 1999-11-08
Abstract
Abstract A device for mowing crop comprising a pair of discs adapted to rotate in the cutting plane, driven with equal angular speeds and pairwise in opposite senses and having each outwardly projecting cutters. A cutter may be bent upwardly due to impact on a stone. In order to avoid further damage of the device the circumferential rim of each disc is incised in between every two cutters essentially along an arc of a circle having a center of curvature located outside the circumferential rim.
Inventors
- 👤 Pieter A. Oosterling
- 👤 Hendricus C. VAN Staveren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:31
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/64; A01D34/66; A01D34/664; A01D34/73; A01D34/736
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
257 words
A device for mowing a crop, comprising in combination: a frame adapted to be attached to a powered vehicle while projecting laterally therefrom, said frame having a series of spaced vertical shafts projecting upwardly therefrom and including means for rotating said shafts so that adjacent pairs thereof rotate in opposition directions; a disc attached to each shaft in overlying relation to said frame, at least a pair of cutters attached to each disc in uniformly angularly spaced relation therearound and each cutter projecting radially outwardly from its disc whereby the tips of the cutters sweep a circular path which is of larger diameter than the circular path swept by their disc, the spacing between said shafts and the diameter of the paths swept by said discs being such that the paths swept by the tips of the cutters of one disc intersect the path swept by the adjacent disc and such that the paths swept by the tips of the cutters of adjacent discs intersect in forwardly spaced relation to said frame, the cutters of adjacent discs being rotationally staggered such that when a cutter of one disc is positioned in alignment between its shaft and the shaft of an adjacent disc, adjacent cutters of the adjacent disc are positioned symmetrically forwardly and rearwardly thereof, and the periphery of such adjacent disc being cut away between such adjacent cutters along an arc centered on said one disc along a line passing through the center of its shaft and the center of the shaft of the adjacent disc.
Claim 2
Independent Claim
257 words
A device for mowing a crop, comprising in combination: a frame adapted to be attached to a powered vehicle while projecting laterally therefrom, said frame having a series of spaced vertical shafts projecting upwardly therefrom and including means for rotating said shafts so that adjacent pairs thereof rotate in opposition directions; a disc attached to each shaft in overlying relation to said frame, at least a pair of cutters attached to each disc in uniformly angularly spaced relation therearound and each cutter projecting radially outwardly from its disc whereby the tips of the cutters sweep a circular path which is of larger diameter than the circular path swept by their disc, the spacing between said shafts and the diameter of the paths swept by said discs being such that the paths swept by the tips of the cutters of one disc intersect the path swept by the adjacent disc and such that the paths swept by the tips of the cutters of adjacent discs intersect in forwardly spaced relation to said frame, the cutters of adjacent discs being rotationally staggered such that when a cutter of one disc is positioned in alignment between its shaft and the shaft of an adjacent disc, adjacent cutters of the adjacent disc are positioned symmetrically forwardly and rearwardly thereof, and the periphery of such adjacent disc being cut away between such adjacent cutters along an arc centered on said one disc along a line passing through the center of its shaft and the center of the shaft of the adjacent disc.
Claim 3
Dependent Claim
36 words
A device as defined in claim 2 wherein each cutter is pivotally connected to its disc and each cut away of each disc is centered between the shaft and cutter pivot point of an adjacent disc.
References Cited (Backward Citations)
DE1813610A1
Cited
DE1903730A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |