US3554294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversing mechanism for two-way plows
Assignee: Case LLC
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Filing: 1967-04-24
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Granted: 1971-01-12
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Expires: 1987-04-24
Abstract
Abstract A two-way plow has a plow carrier swingable approximately 180* about a longitudinal axis through a central or dead center position between right- and left-hand plowing positions. Reversal is accomplished with a hydraulic cylinder which swings with the plow carrier on the retraction stroke through the dead center position to an overcenter position where it is locked to prevent the carrier from being bounced backward overcenter in the other direction until the cylinder fluid is reversed to extend the cylinder and continue the rotation of the plow carrier to its alternate plowing position.
Inventors
- 👤 James Morkoski
- 👤 Louis B Garriott Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:37
CPC Classifications
A; A01; A01B; A01B3/00; A01B3/36; A01B3/40; A01B3/42; A01B3/421
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
In a two-way plow having a relatively stationary frame pivotally supporting a plow carrier for movement about a longitudinal axis between right-hand and left-hand plowing positions, means for pivotally moving said plow carrier alternately from one of said positions to the other comprising a fluid-operated ram pivotally connected at one end to said frame and pivotally connected at the other end to said carrier in operative relation, said carrier being movable in one direction from one of its plowing positions through a central zone adjacent to a vertical plane coincidental with said axis to an overcenter attitude in response to the operation of said ram in one direction, and Latch means on said frame and said carrier operable reactively when said carrier is moved into said central zone and positioned to preclude retrograde movement of said carrier from said zone.
Claim 2
Dependent Claim
140 words
In a two-way plow having a relatively stationary frame pivotally supporting a plow carrier for movement about a longitudinal axis between right-hand and left-hand plowing positions, means for pivotally moving said plow carrier alternately from one of said positions to the other comprising a fluid-operated ram pivotally connected at one end to said frame and pivotally connected at the other end to said carrier in operative relation, said carrier being movable in one direction from one of its plowing positions through a central zone adjacent to a vertical plane coincidental with said axis to an overcenter attitude in response to the operation of said ram in one direction, and Latch means on said frame and said carrier operable reactively when said carrier is moved into said central zone and positioned to preclude retrograde movement of said carrier from said zone.
Claim 3
Dependent Claim
37 words
The invention set forth in claim 1 wherein said latch means includes a component disposed on said frame and a component disposed on said carrier positioned for engagement when the carrier is moved into said central zone.
Claim 4
Dependent Claim
82 words
The invention set forth in claim 2 wherein said component disposed on said frame includes abutment means and said component disposed on the carrier includes a latch member in the form of a pendant pivotally mounted on said carrier and positioned for engagement with said abutment means when said carrier is moved to said overcenter attitude whereby retrograde movement of said carrier is precluded, and said pendant being pivotally movable to accommodate movement of said carrier unrestrictively to its other plowing position.
Claim 5
Dependent Claim
63 words
The invention set forth in claim 1 wherein the pivotal connection of said ram to said frame includes a pin carried by said ram positioned in an oversize opening disposed in said frame to provide a lost-motion means between said ram and said frame to permit said carrier to move into said overcenter attitude during operation of said ram in said one direction.
Claim 6
Dependent Claim
47 words
The invention set forth in claim 4 wherein said ram is completely retracted during movement of said carrier in said central zone and the lost-motion means of said pin in said oversize opening permits the momentum of the carrier to move the carrier to said overcenter attitude.
Claim 7
Dependent Claim
87 words
In a two-way plow having a relatively stationary frame pivotally supporting a plow carrier for movement about a longitudinal axis between right-hand and left-hand plowing positions, power operated means for pivotally moving said plow carrier alternately from one of said positions to the other through a central zone adjacent to a vertical plane coincidental with said axis to an overcenter attitude, and means disposed on said frame and said carrier positioned to preclude retrograde movement of said carrier when said carrier is moved to said overcenter attitude.
Claim 8
Dependent Claim
87 words
In a two-way plow having a relatively stationary frame pivotally supporting a plow carrier for movement about a longitudinal axis between right-hand and left-hand plowing positions, power operated means for pivotally moving said plow carrier alternately from one of said positions to the other through a central zone adjacent to a vertical plane coincidental with said axis to an overcenter attitude, and means disposed on said frame and said carrier positioned to preclude retrograde movement of said carrier when said carrier is moved to said overcenter attitude.
Claim 9
Dependent Claim
82 words
The invention set forth in claim 6 wherein the said power-operated means for pivotally moving said plow carrier is a fluid-operated ram pivotally connected at one end to said frame and pivotally connected at the other end to said carrier, said ram being fully retracted when said carrier is moved into said central zone, one of said pivotal connections of said ram having lost-motion means to accommodate movement of the carrier by momentum thereof through said central zone to said overcenter attitude.
Claim 10
Dependent Claim
48 words
The invention set forth in claim 7 wherein said means to preclude retrograde movement of said carrier when said carrier is moved to said overcenter attitude is a latch mechanism disposed on said frame and said carrier adapted for engagement when said carrier moves to said overcenter attitude.
Claim 11
Dependent Claim
98 words
The invention set forth in claim 8 wherein said latch mechanism comprises stationary abutment means disposed on said frame and a freely swingable latch dog pivotally mounted on and depending downwardly from said carrier throughout the range of movement of said carrier from one of said plowing positions to the other, said latch dog being deflectable by said abutment means during movement of the carrier in a direction from one of its plowing positions to the other and engageable with said abutment means at said overcenter attitude in said central zone to prevent retrograde movement of said carrier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |