Patent US3112798A successfully refreshed from Google Patents.
US3112798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power-liftable hitches
Assignee: Ford Motor Co
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Filing: 1960-10-14
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Granted: 1963-12-03
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Expires: 1980-10-14
Abstract
No abstract record available.
Inventors
- 👤 William J Foxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:23
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/112
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
IN A TRACTOR HAVING A REAR AXLE ASSEMBLY PROVIDED WITH A 3-POINT IMPLEMENT HITCH INCLUDING A PAIR OF POWERLIFTABLE DRAFT LINKS AND A TOP LINK, AND IN WHICH DRAFT ON AN IMPLEMENT MOUNTED ON SAID HITCH PRODUCES FORWARD THRUST ON THE TOP LINK; MEANS, INCLUDING A HYDRAULIC CYLINDER, FOR LIFTING THE DRAFT LINKS, AND DRAFT RESPONSIVE MECHANISM INCLUDING A DRAFT SENSING PLUNGER MOUNTED FOR LONGIRESPONSIVE TO THE FORWARD THRUST OF THE TOP LINK, SAID MECHANISM INCLUDING A DRAFT SENSING PLUNGER MOUNTED FOR LONGITUDINAL MOVEMENT IN THE REAR AXLE ASSEMBLY AND CONNECTED WITH AND DISPLACED BY THE THRUST OF SAID TOP LINK, AND A COXIAL VARIABLE RATE COIL SPRING INTERPOSED BETWEEN THE REAR AXLE ASSEMBLY AND PLUNGER AND COMPRESSED BY DISPLACEMENT OF THE PLUNGER, SAID SPRING COMPRISING A SINGLE COIL HAVING TURNS OF UNIFORM DIAMETER SPACED INCREASINGLY FURTHER APART FROM ONE END OF THE SPRING TO THE OTHER TO PROVIDE A VARIABLE RATE SPRING OF GENERALLY UNIFORMLY INCREASING RATE AS IT IS COMPRESSED, THE DRAFT SENSING PLUNGER BEING AXIALLY DISPLACED VARYING AMOUNTS DEPENDENT ON THE AMOUNT OF FORWARD THRUST ON THE TOP LINK.
Claim 2
Dependent Claim
182 words
IN A TRACTOR HAVING A REAR AXLE ASSEMBLY PROVIDED WITH A 3-POINT IMPLEMENT HITCH INCLUDING A PAIR OF POWERLIFTABLE DRAFT LINKS AND A TOP LINK, AND IN WHICH DRAFT ON AN IMPLEMENT MOUNTED ON SAID HITCH PRODUCES FORWARD THRUST ON THE TOP LINK; MEANS, INCLUDING A HYDRAULIC CYLINDER, FOR LIFTING THE DRAFT LINKS, AND DRAFT RESPONSIVE MECHANISM INCLUDING A DRAFT SENSING PLUNGER MOUNTED FOR LONGIRESPONSIVE TO THE FORWARD THRUST OF THE TOP LINK, SAID MECHANISM INCLUDING A DRAFT SENSING PLUNGER MOUNTED FOR LONGITUDINAL MOVEMENT IN THE REAR AXLE ASSEMBLY AND CONNECTED WITH AND DISPLACED BY THE THRUST OF SAID TOP LINK, AND A COXIAL VARIABLE RATE COIL SPRING INTERPOSED BETWEEN THE REAR AXLE ASSEMBLY AND PLUNGER AND COMPRESSED BY DISPLACEMENT OF THE PLUNGER, SAID SPRING COMPRISING A SINGLE COIL HAVING TURNS OF UNIFORM DIAMETER SPACED INCREASINGLY FURTHER APART FROM ONE END OF THE SPRING TO THE OTHER TO PROVIDE A VARIABLE RATE SPRING OF GENERALLY UNIFORMLY INCREASING RATE AS IT IS COMPRESSED, THE DRAFT SENSING PLUNGER BEING AXIALLY DISPLACED VARYING AMOUNTS DEPENDENT ON THE AMOUNT OF FORWARD THRUST ON THE TOP LINK.
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) | 1966-12-02 | 1967-06-03 | 1967-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-02 | 1971-06-03 | 1971-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-02 | 1975-06-03 | 1975-12-03 | $7700.00 | Window Closed / Lapsed |