US3271956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic apparatus
Assignee: Dowty Technical Developments Ltd
•
Filing: 1965-04-15
•
Granted: 1966-09-13
•
Expires: 1985-04-15
Abstract
No abstract record available.
Inventors
- 👤 Lambeth Dennis Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:16
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/433; B; B63; B63H; B63H23/00; B63H23/22; B63H23/26; F16H61/427
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A HYDRAULIC POWER TRANSMISSION COMPRISING A TILTING HEAD PUMP UNIT IN HYDRAULIC CONNECTION WITH A TILTING HEAD MOTOR UNIT, A SUPPORT LOCATING THE TILT AXES AND THE DRIVE SHAFTS IN FIXED RELATIVE POSITIONS IN WHICH THE TILT AXES ARE PARALLEL TO ONE ANOTHER, A LINK OF FIXED LENGTH HAVING A PAIR OF SPACED PIVOTS CONNECTING THE LINK RESPECTIVELY TO THE PUMP HEAD AND TO THE MOTOR HEAD, THE PIVOTS HAVING AXES PARALLEL TO THE TILT AXES AND BEING ATTACHED TO THE HEADS EITHER DIRECTLY OR THROUGH EXTENSIONS WHEREBY THE SPACING FOR EACH HEAD BETWEEN THE TILT AXIS AND THE PIVOT AXIS FORMS A LEVER ARM, THE WHOLE ARRANGEMENT BEING SUCH THAT DURING TILT MOVEMENT OF THE HEADS A POSITION IS OBTAINABLE, REFERRED TO AS PUMP DEAD CENTRE, IN WHICH THE MOTOR PIVOT AXIS LIES BETWEEN AND IN ONE PLANE WITH THE PUMP TILT AXIS AND THE PUMP PIVOT AXIS.
Claim 2
Dependent Claim
149 words
A HYDRAULIC POWER TRANSMISSION COMPRISING A TILTING HEAD PUMP UNIT IN HYDRAULIC CONNECTION WITH A TILTING HEAD MOTOR UNIT, A SUPPORT LOCATING THE TILT AXES AND THE DRIVE SHAFTS IN FIXED RELATIVE POSITIONS IN WHICH THE TILT AXES ARE PARALLEL TO ONE ANOTHER, A LINK OF FIXED LENGTH HAVING A PAIR OF SPACED PIVOTS CONNECTING THE LINK RESPECTIVELY TO THE PUMP HEAD AND TO THE MOTOR HEAD, THE PIVOTS HAVING AXES PARALLEL TO THE TILT AXES AND BEING ATTACHED TO THE HEADS EITHER DIRECTLY OR THROUGH EXTENSIONS WHEREBY THE SPACING FOR EACH HEAD BETWEEN THE TILT AXIS AND THE PIVOT AXIS FORMS A LEVER ARM, THE WHOLE ARRANGEMENT BEING SUCH THAT DURING TILT MOVEMENT OF THE HEADS A POSITION IS OBTAINABLE, REFERRED TO AS PUMP DEAD CENTRE, IN WHICH THE MOTOR PIVOT AXIS LIES BETWEEN AND IN ONE PLANE WITH THE PUMP TILT AXIS AND THE PUMP PIVOT AXIS.
References Cited (Backward Citations)
CA693320A
Cited
US3142963A
Cited
US3142964A
Cited
US3143859A
Cited
GB962361A
Cited
US3163987A
Cited
US3213619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |