US3583495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Implements with tail wheel lift assists
Assignee: Deere and Co
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Filing: 1968-04-15
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Granted: 1971-06-08
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Expires: 1988-04-15
Abstract
Abstract An implement for use with a tractor having a conventional threepoint hitch including a pair of lower draft links and an upper compression link, the implement being provided with a hydraulically actuated tail wheel for lifting the rear end of the implement, the forward end of the implement being secured to the lower draft links and having a pivoted mast the upper end of which is secured to the upper compression link, there being lockable means for preventing rotation of the mast relative to the frame during certain phases of operation of the implement.
Inventors
- 👤 John Isaac Cantral
- 👤 Robert Otto Taube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:18
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/14; A01B63/16; A01B63/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
227 words
In combination with a tractor having a pair of lower links and an upper link and a fluid system including a fluid reservoir, pump, and valve means operable to alternately interconnect a pair of fluid outlets on the tractor with said pump and said reservoir, an implement including a frame pivotally interconnected with said lower draft links, a generally vertically extending mast pivotally carried by said frame and interconnected at its upper end with said upper link, a singleacting hydraulic cylinder interconnecting said frame with the upper end of said mast and operable when under pressure to hold said mast and frame in fixed relative positions and when not under pressure to permit the frame to pivot relative to the mast, a ground-engaging wheel means rotatably carried on an arm pivotally secured to said frame, and a double-acting extensible and retractable hydraulic cylinder mounted between said arm and said frame downwardly to raise the rear end of the implement, and when retracted to permit the rear end of the implement to assume a ground-working position, a pair of fluid lines interconnecting the double-acting hydraulic cylinder with said pair of outlets, and a further fluid line interconnecting said single-acting hydraulic cylinder with one of said pair of lines, said one of said pair of lines when carrying fluid under pressure causing the ground-engaging wheel means to be raised.
Claim 2
Dependent Claim
227 words
In combination with a tractor having a pair of lower links and an upper link and a fluid system including a fluid reservoir, pump, and valve means operable to alternately interconnect a pair of fluid outlets on the tractor with said pump and said reservoir, an implement including a frame pivotally interconnected with said lower draft links, a generally vertically extending mast pivotally carried by said frame and interconnected at its upper end with said upper link, a singleacting hydraulic cylinder interconnecting said frame with the upper end of said mast and operable when under pressure to hold said mast and frame in fixed relative positions and when not under pressure to permit the frame to pivot relative to the mast, a ground-engaging wheel means rotatably carried on an arm pivotally secured to said frame, and a double-acting extensible and retractable hydraulic cylinder mounted between said arm and said frame downwardly to raise the rear end of the implement, and when retracted to permit the rear end of the implement to assume a ground-working position, a pair of fluid lines interconnecting the double-acting hydraulic cylinder with said pair of outlets, and a further fluid line interconnecting said single-acting hydraulic cylinder with one of said pair of lines, said one of said pair of lines when carrying fluid under pressure causing the ground-engaging wheel means to be raised.
Claim 3
Dependent Claim
69 words
The combination set forth in claim 1 wherein valve means are provided in the one of said pair of lines and the further fluid line to restrict fluid flow to the double-acting cylinder through the one of said pair of lines and from the single-acting cylinder while affording free fluid flow from the double-acting cylinder through the one of said pair of fluid lines and to the single-acting cylinder.
Claim 4
Dependent Claim
132 words
In combination, a tractor having a three-point hitch including a pair of lower draft links and an upper compression link, an implement frame pivotally connected to the draft links, an arm pivotally connected to the frame and extending generally rearwardly therefrom, a ground-engaging wheel carried at the rear of the arm, extensible and retractable means for raising and lowering the rear end of the arm relative to the frame having opposite ends pivotally connected to the frame and arm, a generally vertically extending mast having its lower end pivotally connected to the frame and its upper end connected to the compression link, and selectively lockable means extending between and interconnected with the frame and mast to selectively lock and unlock, respectively, the mast and frame against and for free relative pivotal movement.
Claim 5
Dependent Claim
132 words
In combination, a tractor having a three-point hitch including a pair of lower draft links and an upper compression link, an implement frame pivotally connected to the draft links, an arm pivotally connected to the frame and extending generally rearwardly therefrom, a ground-engaging wheel carried at the rear of the arm, extensible and retractable means for raising and lowering the rear end of the arm relative to the frame having opposite ends pivotally connected to the frame and arm, a generally vertically extending mast having its lower end pivotally connected to the frame and its upper end connected to the compression link, and selectively lockable means extending between and interconnected with the frame and mast to selectively lock and unlock, respectively, the mast and frame against and for free relative pivotal movement.
Claim 6
Dependent Claim
61 words
The combination set forth in claim 3 wherein the means to selectively lock the frame and mast from relative pivotal movement includes a hydraulic cylinder means acting to hold the frame and mast in fixed relative positions when under pressure and means to selectively supply fluid under pressure to the hydraulic cylInder means and exhaust fluid from the hydraulic cylinder means.
Claim 7
Dependent Claim
134 words
In combination, a tractor having a three-point hitch including a pair of lower draft links and an upper compression link, an implement frame pivotally connected to the draft links, an arm pivotally connected to the frame and extending generally rearwardly therefrom, a wheel carried at the rear of the arm, means connected between the arm and the frame to selectively raise and lower the arm relative to the frame, a generally vertically extending mast having its lower end pivotally connected to the frame and its upper end connected to the compression link, and means connected between the mast and frame operatively interconnected with and responsive to the first-mentioned means raising and lowering the arm relative to the frame to lock and unlock, respectively, the mast and frame against and for free relative pivotal movement.
Claim 8
Dependent Claim
134 words
In combination, a tractor having a three-point hitch including a pair of lower draft links and an upper compression link, an implement frame pivotally connected to the draft links, an arm pivotally connected to the frame and extending generally rearwardly therefrom, a wheel carried at the rear of the arm, means connected between the arm and the frame to selectively raise and lower the arm relative to the frame, a generally vertically extending mast having its lower end pivotally connected to the frame and its upper end connected to the compression link, and means connected between the mast and frame operatively interconnected with and responsive to the first-mentioned means raising and lowering the arm relative to the frame to lock and unlock, respectively, the mast and frame against and for free relative pivotal movement.
Claim 9
Dependent Claim
141 words
In combination, a tractor having a vertically movable and power-operated hitch including a pair of lower draft links, an implement frame pivotally connected to the draft links, an arm having one end pivotally connected to the frame and extending generally rearwardly therefrom, a ground-engaging wheel carried at the rear end of the arm, an extensible and retractable hydraulic cylinder having opposite ends pivotally connected to the frame and arm for raising and lowering the rear end of the arm, and means extending between and interconnected with the tractor and frame forming an upper connection between the tractor and frame, the last-mentioned means including extensible and retractable means which is selectively lockable in a fixed position to prevent free pivotal movement of the frame on the draft links and unlockable to afford free pivotal movement of the frame on the draft links.
Claim 10
Dependent Claim
141 words
In combination, a tractor having a vertically movable and power-operated hitch including a pair of lower draft links, an implement frame pivotally connected to the draft links, an arm having one end pivotally connected to the frame and extending generally rearwardly therefrom, a ground-engaging wheel carried at the rear end of the arm, an extensible and retractable hydraulic cylinder having opposite ends pivotally connected to the frame and arm for raising and lowering the rear end of the arm, and means extending between and interconnected with the tractor and frame forming an upper connection between the tractor and frame, the last-mentioned means including extensible and retractable means which is selectively lockable in a fixed position to prevent free pivotal movement of the frame on the draft links and unlockable to afford free pivotal movement of the frame on the draft links.
Claim 11
Dependent Claim
60 words
The combination set forth in claim 6 wherein the extensible and retractable means is a hydraulic cylinder having one end anchored to the frame and a second end operatively connected to the tractor and acting when supplied with fluid pressure to hold the frame in a fixed attitude relative to the tractor for any given position of the draft links.
Claim 12
Dependent Claim
74 words
The combination set forth in claim 6 wherein the means forming an upper connection between the tractor and frame further includes a generally vertically extending mast having its lower end pivotally connected to the frame, a compression link extending between and interconnected with the mast and tractor, and the extensible and retractable means extends between and is interconnected with the mast and frame to selectively lock the mast and frame from relative pivotal movement.
Claim 13
Dependent Claim
148 words
In combination, a tractor having a vertically movable and power-operated hitch including a pair of lower draft links, an implement frame pivotally connected to the draft links, an arm having one end pivotally connected to the frame and extending generally rearwardly therefrom, a ground-engaging wheel carried at the rear end of the arm, an extensible and retractable hydraulic cylinder having opposite ends pivotally connected to the frame and arm for raising and lowering the rear end of the arm, and means extending between and interconnected with the tractor and frame forming an upper connection between the tractor and frame, the last-mentioned means including extensible and retractable means operatively interconnected with and lockable and unlockable in response to the hydraulic cylinder raising and lowering, respectively, the arm relative to the frame to prevent and permit free pivotal movement of the frame about its pivotal connections with the draft links.
Claim 14
Dependent Claim
148 words
In combination, a tractor having a vertically movable and power-operated hitch including a pair of lower draft links, an implement frame pivotally connected to the draft links, an arm having one end pivotally connected to the frame and extending generally rearwardly therefrom, a ground-engaging wheel carried at the rear end of the arm, an extensible and retractable hydraulic cylinder having opposite ends pivotally connected to the frame and arm for raising and lowering the rear end of the arm, and means extending between and interconnected with the tractor and frame forming an upper connection between the tractor and frame, the last-mentioned means including extensible and retractable means operatively interconnected with and lockable and unlockable in response to the hydraulic cylinder raising and lowering, respectively, the arm relative to the frame to prevent and permit free pivotal movement of the frame about its pivotal connections with the draft links.
Claim 15
Dependent Claim
240 words
In combination with a tractor having a pair of lower draft links and a fluid system including a reservoir, a pump, a pair of outlets and valve means operable to alternately interconnect the outlets with the pump and reservoir, an implement comprising: a frame pivotally connected to the lower draft links; an arm having front and rear ends with its front end pivotally connected to the frame; wheel means carried on tHe rear end of the arm; a double-acting extensible and retractable hydraulic cylinder having anchor and rod ends connected to the frame and arm and operable when extending to lower the rear end of the arm relative to the frame and when retracted to raise the rear end of the arm relative to the frame; a first fluid line interconnecting one of said pair of outlets with the anchor end of the cylinder; a second fluid line interconnecting the other of said pair of outlets to the rod end of the cylinder; a single-acting extensible and retractable hydraulic cylinder having its opposite ends operatively connected to the frame and tractor and acting, when supplied with fluid under pressure, to lock the frame from free pivotal movement about its connection with the draft links and to hold the frame in a fixed attitude relative to the tractor for any given position of the draft links; and a third fluid line interconnecting the second fluid line with the single-acting hydraulic cylinder.
Claim 16
Dependent Claim
240 words
In combination with a tractor having a pair of lower draft links and a fluid system including a reservoir, a pump, a pair of outlets and valve means operable to alternately interconnect the outlets with the pump and reservoir, an implement comprising: a frame pivotally connected to the lower draft links; an arm having front and rear ends with its front end pivotally connected to the frame; wheel means carried on tHe rear end of the arm; a double-acting extensible and retractable hydraulic cylinder having anchor and rod ends connected to the frame and arm and operable when extending to lower the rear end of the arm relative to the frame and when retracted to raise the rear end of the arm relative to the frame; a first fluid line interconnecting one of said pair of outlets with the anchor end of the cylinder; a second fluid line interconnecting the other of said pair of outlets to the rod end of the cylinder; a single-acting extensible and retractable hydraulic cylinder having its opposite ends operatively connected to the frame and tractor and acting, when supplied with fluid under pressure, to lock the frame from free pivotal movement about its connection with the draft links and to hold the frame in a fixed attitude relative to the tractor for any given position of the draft links; and a third fluid line interconnecting the second fluid line with the single-acting hydraulic cylinder.
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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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |