US3918529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sectional implement having sequential lifting and lowering
Assignee: Krause Plow Corp Inc
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Filing: 1974-06-14
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Granted: 1975-11-11
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Expires: 1994-06-14
Abstract
Abstract The rear of massive disc harrow is swung toward the ground first until the rear gangs are grounded, whereupon the front of the harrow is swung downwardly about the fulcrum between the rear gangs and the ground in order to lower the front gangs. The process is reversed when the gangs are to be raised from the ground, with the front of the harrow lifting first, followed by the rear. A special articulated tongue facilitates such rocking action during raising and lowering.
Inventors
- 👤 Glenn E Frager
- 👤 Bill J Penninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:09
CPC Classifications
A; A01; A01B; A01B73/00; A01B73/02; A01B23/00; A01B23/04; A01B23/046
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
336 words
In a tillage implement: a supporting chassis having a normally front and a normally rear end; a first set of tillage tools mounted on the rear end of the chassis and a second set of tillage tools mounted on the front end of the chassis; ground engaging means located on the chassis between said first and second tool sets and supporting the chassis for advancement above and along the ground; a tongue secured to and extending forwardly from said front end of the chassis for coupling the latter with a towing vehicle, said tongue being jointed, having at least a pair of rigid pieces swingably interconnected for alternately disposing the tongue in a buckled position raising said front end of the chassis and the second set of tools and an unbuckled position lowering said front end of the chassis and the second set of tools, said ground engaging means being shiftable toward and away from said chassis for movement between a first position raising said rear end of the chassis and the first set of tools and a second position lowering said rear end of the chassis and the first set of tools; and a fluid-pressure power system for controlling said buckling of the tongue and said shifting of the ground engaging means, said power system including first power means between said chassis and the ground engaging means controlling said shifting of the latter, said power system further including second power means between said rigid pieces of the tongue controlling said buckling of the latter, said first power means normally having greater loading thereon than the loading on said second power means, said first and second power means being coupled in parallel fluid flow relationship with one another and being of substantially equal fluid capacities for causing actuation of said first power means before the second power means during release of fluid pressure in said system and for causing actuation of the second power means before the first power means during pressure buildup in the system.
Claim 2
Dependent Claim
336 words
In a tillage implement: a supporting chassis having a normally front and a normally rear end; a first set of tillage tools mounted on the rear end of the chassis and a second set of tillage tools mounted on the front end of the chassis; ground engaging means located on the chassis between said first and second tool sets and supporting the chassis for advancement above and along the ground; a tongue secured to and extending forwardly from said front end of the chassis for coupling the latter with a towing vehicle, said tongue being jointed, having at least a pair of rigid pieces swingably interconnected for alternately disposing the tongue in a buckled position raising said front end of the chassis and the second set of tools and an unbuckled position lowering said front end of the chassis and the second set of tools, said ground engaging means being shiftable toward and away from said chassis for movement between a first position raising said rear end of the chassis and the first set of tools and a second position lowering said rear end of the chassis and the first set of tools; and a fluid-pressure power system for controlling said buckling of the tongue and said shifting of the ground engaging means, said power system including first power means between said chassis and the ground engaging means controlling said shifting of the latter, said power system further including second power means between said rigid pieces of the tongue controlling said buckling of the latter, said first power means normally having greater loading thereon than the loading on said second power means, said first and second power means being coupled in parallel fluid flow relationship with one another and being of substantially equal fluid capacities for causing actuation of said first power means before the second power means during release of fluid pressure in said system and for causing actuation of the second power means before the first power means during pressure buildup in the system.
Claim 3
Dependent Claim
43 words
In a tillage implement as claimed in claim 1, wherein one of said rigid tongue pieces comprises a bell crank having a pair of angularly offset legs, said second power means interconnecting the other tongue piece and one leg of said bell crank.
Claim 4
Dependent Claim
43 words
In a tillage implement as claimed in claim 2, wherein said tongue includes a third, forwardmost, rigid tongue piece pivotally connected to the other leg of said bell crank remote from the pivotal connection between the bell crank and said other tongue piece.
Claim 5
Dependent Claim
34 words
In a tillage implement as claimed in claim 1, wherein said tongue is vertically swingable on said chassis, said chassis having weiGht transfer means coupled with the tongue and yieldably biasing the latter downwardly.
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |