Patent US3666019A successfully refreshed from Google Patents.
US3666019A
Expired / Lapsed
US
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Row marking apparatus
Assignee: Case LLC
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Filing: 1969-10-07
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Granted: 1972-05-30
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Expires: 1989-10-07
Abstract
Abstract A row marking apparatus including first and second row markers individually pivoted at one end on a tool bar of a tractor. Each marker is pivoted between raised and lowered positions by a ram having its cylinder connected to the tool bar and its piston rod pivotally connected intermediate the ends of the associated row marker. The flow of fluid to and from the ram is automatically controlled by a flow control valve which provides first and second isolated flow paths between a main valve and the rams. The flow paths cooperate with the rams to alternatively (1) sequentially raise and lower respective markers or (2) raise and lower an individual lowered marker. Each row marker is preferably formed in two sections which are pivotally interconnected at adjacent ends and which are moved between folded and end-to-end relation when the row marker is moved between the lowered and raised positions. This movement is accomplished by a cable having one end connected to the tool bar and an opposite end connected to the second section and an intermediate portion of the cable cooperating with a guide located adjacent the pivotal connection for the sections.
Inventors
- 👤 Laurel R Yeske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:55
CPC Classifications
A; A01; A01B; A01B69/00; A01B69/02; A01B69/024
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
352 words
A row marking apparatus adapted to be used with a tractor of the type having a tool bar and a hydraulic system including a reservoir, a pressured fluid source and conduits connecting a valve to said source and said reservoir, comprising a pair of bracket means adapted to be attached adjacent opposite ends of the tool bar; a pair of row markers respectively pivotally connected at one end to said bracket means; and means for moving said row markers between raised and lowered positions comprising a pair of fluid rams each including a cylinder and a piston rod extensible and retractable in said cylinder, said cylinders respectively being pivoted on respective bracket means; lever means connecting the free ends of said piston rods respectively to intermediate portions of said row markers, said lever means accommodating limited movement of said row markers relative to said piston rods; conduit means connecting said valve to opposite ends of said cylinders whereby actuation of said valve in opposite directions from a neutral position will raise and lower said row markers; and flow control means in said conduit means for (1) sequentially raising a lowered row marker and lowering a raised row marker when one of said row markers is in the lowered position and said valve is moved in one direction from a neutral position and (2) alternatively raising and lowering said row marker in the lowered position when said valve is moved in opposite directions from a neutral position, said flow control means defining first and second flow paths from said valve to said cylinders, each flow path having a main portion connected to one end of one of said cylinders and an auxiliary portion connected to an opposite end of the other of said cylinders; and check valve means in each of said auxiliary portions of said flow paths and accommodating flow of fluid from the main portions connected to one end of one of said cylinders through the auxiliary portions to the opposite end of the other of said cylinders when the pressure of fluid in said main portions reaches a predetermined level.
Claim 2
Dependent Claim
352 words
A row marking apparatus adapted to be used with a tractor of the type having a tool bar and a hydraulic system including a reservoir, a pressured fluid source and conduits connecting a valve to said source and said reservoir, comprising a pair of bracket means adapted to be attached adjacent opposite ends of the tool bar; a pair of row markers respectively pivotally connected at one end to said bracket means; and means for moving said row markers between raised and lowered positions comprising a pair of fluid rams each including a cylinder and a piston rod extensible and retractable in said cylinder, said cylinders respectively being pivoted on respective bracket means; lever means connecting the free ends of said piston rods respectively to intermediate portions of said row markers, said lever means accommodating limited movement of said row markers relative to said piston rods; conduit means connecting said valve to opposite ends of said cylinders whereby actuation of said valve in opposite directions from a neutral position will raise and lower said row markers; and flow control means in said conduit means for (1) sequentially raising a lowered row marker and lowering a raised row marker when one of said row markers is in the lowered position and said valve is moved in one direction from a neutral position and (2) alternatively raising and lowering said row marker in the lowered position when said valve is moved in opposite directions from a neutral position, said flow control means defining first and second flow paths from said valve to said cylinders, each flow path having a main portion connected to one end of one of said cylinders and an auxiliary portion connected to an opposite end of the other of said cylinders; and check valve means in each of said auxiliary portions of said flow paths and accommodating flow of fluid from the main portions connected to one end of one of said cylinders through the auxiliary portions to the opposite end of the other of said cylinders when the pressure of fluid in said main portions reaches a predetermined level.
Claim 3
Dependent Claim
267 words
In A row marking apparatus having a pair of row markers respectively pivoted at one end on brackets; and fluid rams having cylinders and piston rods extensible to lower said markers and retractable to raise said row markers, a fluid control system comprising a fluid source under pressure; a reservoir, a control valve and conduit means connecting said control valve to opposite ends of said cylinders and to said source and reservoir; the improvement of flow control means in said conduit means for alternatively (1) sequentially retracting one piston rod in its associated cylinder and extending the other piston rod in its cylinder by movement of the control valve in one direction from a neutral position to sequentially raise one row marker and lower the other row marker, (2) retracting and extending said one piston rod to raise and lower said one row marker when said valve is moved in opposite directions from a neutral position, said flow control means defining first and second flow paths, each of said flow paths having a main portion connected to one end of one of said cylinders and an auxiliary portion connected to the opposite end of the other of said cylinders, said auxiliary portion having check valve means preventing flow of fluid in said auxiliary portion of said flow path when the piston in said one of said cylinders is in other than the fully retracted position and accommodating flow of fluid to said other of said cylinders to extend the piston rod when the piston rod of said one of said cylinders is in the fully retracted position.
Claim 4
Dependent Claim
267 words
In A row marking apparatus having a pair of row markers respectively pivoted at one end on brackets; and fluid rams having cylinders and piston rods extensible to lower said markers and retractable to raise said row markers, a fluid control system comprising a fluid source under pressure; a reservoir, a control valve and conduit means connecting said control valve to opposite ends of said cylinders and to said source and reservoir; the improvement of flow control means in said conduit means for alternatively (1) sequentially retracting one piston rod in its associated cylinder and extending the other piston rod in its cylinder by movement of the control valve in one direction from a neutral position to sequentially raise one row marker and lower the other row marker, (2) retracting and extending said one piston rod to raise and lower said one row marker when said valve is moved in opposite directions from a neutral position, said flow control means defining first and second flow paths, each of said flow paths having a main portion connected to one end of one of said cylinders and an auxiliary portion connected to the opposite end of the other of said cylinders, said auxiliary portion having check valve means preventing flow of fluid in said auxiliary portion of said flow path when the piston in said one of said cylinders is in other than the fully retracted position and accommodating flow of fluid to said other of said cylinders to extend the piston rod when the piston rod of said one of said cylinders is in the fully retracted position.
Claim 5
Dependent Claim
43 words
A row marking apparatus as defined in claim 1, including the further improvement of said first and second flow paths each having a by-pass flow path accommodating unidirectional flow of fluid from said auxiliary portion to said main portion of each flow path.
Claim 6
Dependent Claim
52 words
The combination as defined in claim 2, in which said first and second flow paths each include a by-pass portion accommodating unidirectional flow from the auxiliary portion to said main portion; said by-pass portions accommodating flow of fluid from the opposite ends of said cylinders through said control valve to said reservoir.
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |