US3256940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic power lift mechanisms
Assignee: David Brown Tractors Ltd
•
Filing: 1963-09-03
•
Granted: 1966-06-21
•
Expires: 1983-09-03
Abstract
No abstract record available.
Inventors
- 👤 Ashfield Herbert Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:30
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/1117
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A HYDRAULIC POWER LIFT MECHANISM FOR A TRACTOR HAVING AN IMPLEMENT HITCHED THERETO COMPRISING A HYDRAULIC JACK, MEANS FOR OPERABLY CONNECTING SAID JACK TO SAID IMPLEMENT FOR VARYING THE POSITION OF SAID IMPLEMENT RELATIVE TO THE TRACTOR AND COMPRISING A MOVABLY MOUNTED MOTION TRANSMITTING MEMBER THE POSITION OF WHICH CHANGES WITH CHANGES IN POSITION OF SAID IMPLEMENT AND DRAFT RESPONSIVE LINKAGE OPERABLY CONNECTING SAID MOTION TRANSMITTING MEMBER TO SAID IMPLEMENT, A MANUALLY CONTROLLED RESPONSE MEMBER FOR CONTROLLING THE FLUID PRESSURE IN SAID JACK, A FLEXIBLE MOTION TRANSMITTING MEMBER CONNECTED FOR ACTUATING THE RESPONSE MEMBER, A FIRST SIGNALLING MEMBER IN SAID LINKAGE CONNECTIBLE TO SAID FLEXIBLE TRANSMITTING MEMBER AND MOVABLE BY VARIATIONS IN THE DRAFT FORCE EXERTED BY THE TRACTOR ON SAID IMPLEMENT, AND A SECOND SIGNALLING MEMBER MOVABLE WITH SAID MOTION TRANSMITTING MEMBER CONNECTIBLE TO SAID FLEXIBLE TRANSMITTING MEMBER AND MOVABLE IN RESPONSE TO VARIATIONS IN THE POSITION OF SAID IMPLEMENT RELATIVE TO THE TRACTOR, SAID FLEXIBLE MOTION TRANSMITTING MEMBER COMPRISING A SINGLE FLEXIBLE CABLE PIVOTALLY CONNECTED SELECTIVELY TO EITHER THE FIRST SIGNALLING MEMBER OR THE SECOND SIGNALLING MEMBER.
Claim 2
Dependent Claim
179 words
A HYDRAULIC POWER LIFT MECHANISM FOR A TRACTOR HAVING AN IMPLEMENT HITCHED THERETO COMPRISING A HYDRAULIC JACK, MEANS FOR OPERABLY CONNECTING SAID JACK TO SAID IMPLEMENT FOR VARYING THE POSITION OF SAID IMPLEMENT RELATIVE TO THE TRACTOR AND COMPRISING A MOVABLY MOUNTED MOTION TRANSMITTING MEMBER THE POSITION OF WHICH CHANGES WITH CHANGES IN POSITION OF SAID IMPLEMENT AND DRAFT RESPONSIVE LINKAGE OPERABLY CONNECTING SAID MOTION TRANSMITTING MEMBER TO SAID IMPLEMENT, A MANUALLY CONTROLLED RESPONSE MEMBER FOR CONTROLLING THE FLUID PRESSURE IN SAID JACK, A FLEXIBLE MOTION TRANSMITTING MEMBER CONNECTED FOR ACTUATING THE RESPONSE MEMBER, A FIRST SIGNALLING MEMBER IN SAID LINKAGE CONNECTIBLE TO SAID FLEXIBLE TRANSMITTING MEMBER AND MOVABLE BY VARIATIONS IN THE DRAFT FORCE EXERTED BY THE TRACTOR ON SAID IMPLEMENT, AND A SECOND SIGNALLING MEMBER MOVABLE WITH SAID MOTION TRANSMITTING MEMBER CONNECTIBLE TO SAID FLEXIBLE TRANSMITTING MEMBER AND MOVABLE IN RESPONSE TO VARIATIONS IN THE POSITION OF SAID IMPLEMENT RELATIVE TO THE TRACTOR, SAID FLEXIBLE MOTION TRANSMITTING MEMBER COMPRISING A SINGLE FLEXIBLE CABLE PIVOTALLY CONNECTED SELECTIVELY TO EITHER THE FIRST SIGNALLING MEMBER OR THE SECOND SIGNALLING MEMBER.
References Cited (Backward Citations)
US3125168A
Cited
US1377602A
Cited
US2577351A
Cited
US2527840A
Cited
US2721508A
Cited
US2799251A
Cited
US3022830A
Cited
DE1111444B
Cited
GB871053A
Cited
US3120278A
Cited
FR1238877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |