Patent US4421177A successfully refreshed from Google Patents.
US4421177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End drive rotary cultivator
Assignee: JI CASE COMPANY A CORP OF
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Filing: 1981-10-09
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Granted: 1983-12-20
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Expires: 2001-10-09
Abstract
Abstract A rotary cultivator is disclosed which is adapted to be supported upon a rear-mounted tractor hitch. The cultivator includes a tined cultivation shaft and a hydraulic motor and drive mechanism for driving one end of the shaft. The cultivator includes an arrangement for selectively varying the speed ratio of the hydraulic motor and cultivation shaft, as well as for selectively changing the length of the cultivation shaft so that the width of the path of soil cultivation may be changed as desired. A pair of spaced, negatively angled ground-engaging surfaces are provided on the cultivator housing for urging the cultivator downwardly during forward movement thus providing a more uniform depth of penetration during soil cultivation.
Inventors
- 👤 William J. Schlapman
- 👤 Roger T. Gault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:37
CPC Classifications
A; A01; A01B; A01B33/00; A01B33/08; A01B33/082
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
A rotary cultivator adapted to be mounted on a tractor for soil cultivation, comprising: a laterally extending housing, a tine cultivation shaft rotatably supported by said housing, drive means disposed at one end of said housing for rotating said cultivator shaft, and ground-engaging means on said housing for urging the cultivator downwardly during forward movement thereof for enhancing soil cultivation by said cultivation shaft, comprising a ground-engaging member mounted on said housing having a first leading edge portion extending angularly rearwardly of the direction of forward movement of the cultivator and including a first ground engaging surface extending angularly inwardly and rearwardly of said leading edge portion and a second ground-engaging surface extending rearwardly of said leading edge generally parallel to the direction of forward movement of said cultivator.
Claim 2
Dependent Claim
129 words
A rotary cultivator adapted to be mounted on a tractor for soil cultivation, comprising: a laterally extending housing, a tine cultivation shaft rotatably supported by said housing, drive means disposed at one end of said housing for rotating said cultivator shaft, and ground-engaging means on said housing for urging the cultivator downwardly during forward movement thereof for enhancing soil cultivation by said cultivation shaft, comprising a ground-engaging member mounted on said housing having a first leading edge portion extending angularly rearwardly of the direction of forward movement of the cultivator and including a first ground engaging surface extending angularly inwardly and rearwardly of said leading edge portion and a second ground-engaging surface extending rearwardly of said leading edge generally parallel to the direction of forward movement of said cultivator.
Claim 3
Dependent Claim
29 words
A rotary cultivator in accordance with claim 1, wherein said ground-engaging member further includes a third ground-engaging surface disposed beneath and extending between said first and second ground-engaging surfaces.
Claim 4
Dependent Claim
110 words
A rotary cultivator adapted to be mounted on a tractor for said cultivator, comprising: a laterally extending cultivator housing, a tined cultivation shaft rotatably supported by said housing, drive means operatively connected with one end of said cultivation shaft for rotation thereof, and a cultivation shaft extension adapted to be selectively connected to a portion of said cultivator shaft for rotation therewith for selectively extending the area of soil cultivation of said cultivator, said cultivation shaft includes a stub shaft disposed in an outer shaft, said stub shaft being removable from said outer shaft and said shaft extension being insertable in said outer shaft in place of said stub shaft.
Claim 5
Dependent Claim
110 words
A rotary cultivator adapted to be mounted on a tractor for said cultivator, comprising: a laterally extending cultivator housing, a tined cultivation shaft rotatably supported by said housing, drive means operatively connected with one end of said cultivation shaft for rotation thereof, and a cultivation shaft extension adapted to be selectively connected to a portion of said cultivator shaft for rotation therewith for selectively extending the area of soil cultivation of said cultivator, said cultivation shaft includes a stub shaft disposed in an outer shaft, said stub shaft being removable from said outer shaft and said shaft extension being insertable in said outer shaft in place of said stub shaft.
Claim 6
Dependent Claim
49 words
A rotary cultivator in accordance with claim 3 and ground-engaging means mounted on said housing for urging the cultivator downwardly during foward movement thereof for enhancing soil cultivation by said cultivation shaft including a leading edge portion extending angularly rearwardly of the direction of forward movement of the cultivator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |