US3572445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift type disc harrow
Assignee: Massey Ferguson Inc
•
Filing: 1968-11-05
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Granted: 1971-03-30
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Expires: 1988-11-05
Abstract
Abstract An offset disc harrow adapted to be connected to a three point tractor hitch which has a frame with a mast and a hitch beam, a front gang pivotally attached to the front of the frame and rear gang pivotally attached to one end of the front gang and slidably connected to the rear portion of the hitch beam. A mechanical linkage extends between the harrow and the tractor in such a manner that when the tractor operator causes the harrow to lift, both gangs are automatically folded forward into a position perpendicular to the centerline of the tractor. Another version uses a hydraulic cylinder to fold the gangs.
Inventors
- 👤 Clarence B Richey
- 👤 Ronald E Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:35
CPC Classifications
A; A01; A01B; A01B21/00; A01B21/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
156 words
A mounted disc harrow adapted to be connected to and carried by the rearwardly extending, power-operated hitch links of a tractor, said disc harrow comprising a frame assembly, a 3-point hitch assembly with a crossbar and a mast mounted on the front portion of the frame assembly, a front gang pivotally attached at a point between its ends to the forward portion of the frame assembly, a rear gang with one end pivotally attached to the adjacent end of the front gang, means slidably connecting the rear gang at a point between its ends to the rear portion of the frame, and power means attached to the rear gang for positively folding both gangs relative to each other and relative to the frame assembly whereby the gangs can be moved from an operative angled position toward a transport position close to the front portion of the frame assembly and towards a position parallel to each other.
Claim 2
Dependent Claim
156 words
A mounted disc harrow adapted to be connected to and carried by the rearwardly extending, power-operated hitch links of a tractor, said disc harrow comprising a frame assembly, a 3-point hitch assembly with a crossbar and a mast mounted on the front portion of the frame assembly, a front gang pivotally attached at a point between its ends to the forward portion of the frame assembly, a rear gang with one end pivotally attached to the adjacent end of the front gang, means slidably connecting the rear gang at a point between its ends to the rear portion of the frame, and power means attached to the rear gang for positively folding both gangs relative to each other and relative to the frame assembly whereby the gangs can be moved from an operative angled position toward a transport position close to the front portion of the frame assembly and towards a position parallel to each other.
Claim 3
Dependent Claim
23 words
The mounted disc harrow of claim 1 wherein the frame assembly includes a hitch beam to which the rear gang is slidably connected.
Claim 4
Dependent Claim
29 words
The mounted disc harrow of claim 2 wherein the hitch beam extends to the rear of the hitch assembly and is angled toward one side of the hitch assembly.
Claim 5
Dependent Claim
46 words
The mounted disc harrow of claim 1 wherein the pivot point attaching the front gang to the frame assembly is located to the side of the frame assembly, relative to the center of the hitch assembly, opposite the common pivot point between front and rear gangs.
Claim 6
Dependent Claim
23 words
The mounted disc harrow of claim 1, wherein the power means for folding the gangs is connected to the front and rear gangs.
Claim 7
Dependent Claim
56 words
The mounted disc harrow of claim 1 wherein the mast is pivotally attached to the frame assembly and the power means for folding the gangs includes linkage means operatively connected to the rear gang and the mast to automatically move both gangs forward in response to pivotal movement of the mast relative to the frame assembly.
Claim 8
Dependent Claim
32 words
The mounted disc harrow of claim 6 wherein the linkage means includes at least one member with adjustable length to vary the angle between the gangs when in the operative angled position.
Claim 9
Dependent Claim
46 words
The mounted disc harrow of claim 3 wherein the pivot point attaching the front gang to the frame assembly is located to the side of the frame assembly, relative to the center of the hitch assembly, opposite the common pivot point between front and rear gangs.
Claim 10
Dependent Claim
23 words
The mounted disc harrow of claim 3 wherein the power means for folding the gangs is connected to the front and rear gangs.
Claim 11
Dependent Claim
23 words
The mounted disc harrow of claim 2 wherein the means for slidably connecting the rear gang to the hitch beam includes antifriction means.
Claim 12
Dependent Claim
108 words
A mounted disc harrow adapted to be connected to and carried by the rearwardly extending power-operated hitch links of a tractor, said disc harrow comprising a frame assembly, a 3-point hitch assembly with a crossbar and a mast mounted on the front portion of the frame assembly, a front gang, pivotally attached at a point between its ends to the frame assembly, a rear gang pivotally attached to the front gang and slidably connected to the frame assembly at a point between its ends, and means to automatically move both gangs towards the hitch assembly and substantially parallel to each other when said 3-point hitch assembly is raised.
Claim 13
Dependent Claim
108 words
A mounted disc harrow adapted to be connected to and carried by the rearwardly extending power-operated hitch links of a tractor, said disc harrow comprising a frame assembly, a 3-point hitch assembly with a crossbar and a mast mounted on the front portion of the frame assembly, a front gang, pivotally attached at a point between its ends to the frame assembly, a rear gang pivotally attached to the front gang and slidably connected to the frame assembly at a point between its ends, and means to automatically move both gangs towards the hitch assembly and substantially parallel to each other when said 3-point hitch assembly is raised.
Claim 14
Dependent Claim
29 words
The mounted disc harrow of claim 11 wherein the frame assembly includes a hitch beam and the mast is pivotal relative to the hitch beam about a horizontal axis.
Claim 15
Dependent Claim
145 words
A mounted disc harrow adapted to be connected to and carried by the rearwardly extending power-operated hitch links of a tractor, said disc harrow comprising a carrier frame assembly including, a mast, and a hitch beam pivotally attached to the mast on a horizontal axis; a front gang pivotally attached to the front portion of the frame assembly; a rear gang pivotally attached at one end to an adjacent end of the front gang and slidably connected to the rear portion of thE hitch beam; and linkage members operatively connected to the mast and the rear gang to utilize the weight of the harrow to move the gangs, relative to each other and the frame assembly, toward a position near the front of the frame assembly and substantially parallel to each other when the top of the mast pivots forward relative to the hitch beam.
Claim 16
Dependent Claim
145 words
A mounted disc harrow adapted to be connected to and carried by the rearwardly extending power-operated hitch links of a tractor, said disc harrow comprising a carrier frame assembly including, a mast, and a hitch beam pivotally attached to the mast on a horizontal axis; a front gang pivotally attached to the front portion of the frame assembly; a rear gang pivotally attached at one end to an adjacent end of the front gang and slidably connected to the rear portion of thE hitch beam; and linkage members operatively connected to the mast and the rear gang to utilize the weight of the harrow to move the gangs, relative to each other and the frame assembly, toward a position near the front of the frame assembly and substantially parallel to each other when the top of the mast pivots forward relative to the hitch beam.
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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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |