Patent US1328665A successfully refreshed from Google Patents.
Patent US4091878A successfully refreshed from Google Patents.
US4091878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ground working implement
Assignee: P J Zweegers en Zonen Landbouwmachinefabriek BV
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Filing: 1976-01-30
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Granted: 1978-05-30
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Expires: 1996-01-30
Abstract
Abstract An agricultural implement for pulverizing the top layer of the soil. It comprises a positively coupled pair of rollers rolling over the ground at unequal surface speeds so that at least one of the rollers is constantly slipping. A harrow is mounted in front of each roller. The assembly of rollers and harrows is pressed onto the ground by a rod comprising a built-in compression spring, which may be adjustable. Each roller is composed of a set of longitudinal strips mounted on an axle.
Inventors
- 👤 Cornelius Jan Steketee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:20
CPC Classifications
A; A01; A01B; A01B49/00; A01B49/02; A01B49/027; A01B29/00; A01B29/04; A01B29/048
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
180 words
A ground working implement comprising a rigid frame adapted to be connected to a three-point lifting device of a tractor vehicle, a pair of ground contacting rollers on said frame positioned successively in the direction of movement of the implement and each roller extending transversely to said direction, a plurality of axially extending ground contacting strips circumferentially positioned around each roller and extending the full length of each roller, means on said frame for applying an adjustable force to press said rollers into ground contact, driving means coupling said rollers for transmitting rotary motion therebetween when said rollers are rotated by movement upon the ground, means on said rollers for rotating the forward roller with respect to the direction of movement at a lower circumferential speed than the other roller and both rollers rotating in the same direction, and a harrow mounted in front of at least one of said rollers, said harrow mounted parallel to and spaced from said one roller and comprising at least one row of spring-loaded vertical prongs extending over the length of said one roller.
Claim 2
Dependent Claim
180 words
A ground working implement comprising a rigid frame adapted to be connected to a three-point lifting device of a tractor vehicle, a pair of ground contacting rollers on said frame positioned successively in the direction of movement of the implement and each roller extending transversely to said direction, a plurality of axially extending ground contacting strips circumferentially positioned around each roller and extending the full length of each roller, means on said frame for applying an adjustable force to press said rollers into ground contact, driving means coupling said rollers for transmitting rotary motion therebetween when said rollers are rotated by movement upon the ground, means on said rollers for rotating the forward roller with respect to the direction of movement at a lower circumferential speed than the other roller and both rollers rotating in the same direction, and a harrow mounted in front of at least one of said rollers, said harrow mounted parallel to and spaced from said one roller and comprising at least one row of spring-loaded vertical prongs extending over the length of said one roller.
Claim 3
Dependent Claim
20 words
Implement according to claim 1 wherein said harrow and the set of two coupled rollers are mounted to said frame.
Claim 4
Dependent Claim
23 words
Implement according to claim 1 wherein the harrow comprises two successive rows of vertical prongs, which may be staggered and loaded by springs.
Claim 5
Dependent Claim
62 words
Implement according to claim 1 wherein said adjustment force applying means comprise a rod carrying a compression spring with an adjustable abutment, said rod being provided between a part of the frame near the rollers and an upwardly directed arm pivotally connected to the frame and adapted to be connected to the top link of the three-point lifting device of a tractor.
Claim 6
Dependent Claim
20 words
Implement according to claim 1 wherein at least one set of two coupled rollers is pivotally mounted to a frame.
Claim 7
Dependent Claim
37 words
Implement according to claim 5 wherein the pivotally connected set of two coupled rollers has an upper arm, an adjustment means acting upon said upper arm to vary the pressure of the front roller onto the ground.
Claim 8
Dependent Claim
25 words
Implement according to claim 6 wherein the upper arm is subjected to a helical spring, the other end of which rests against an adjustable abutment.
Claim 9
Dependent Claim
32 words
Implement according to claim 7 wherein the adjustable abutment is formed by a shoulder of a screw threaded spindle cooperating with, and adjustable with respect to, a fixed part of the frame.
Claim 10
Dependent Claim
36 words
Implement according to claim 1 wherein each of the strips on the forward roller is smooth and has a front part of which as viewed in the direction of rotation, is bent outwards at about 45°.
Claim 11
Dependent Claim
38 words
Implement according to claim 1 wherein each of the strips on the rear roller has a front part of which as viewed in the direction of rotation is bent outwards at about 45° and has a toothed edge.
Claim 12
Dependent Claim
19 words
Implement according to claim 10 wherein the main portion of each strip extends substantially tangentially to the roller circumference.
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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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |