US3159246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic brake
Assignee: Svenska Rotor Maskiner AB
•
Filing: 1962-05-25
•
Granted: 1964-12-01
•
Expires: 1982-05-25
Abstract
No abstract record available.
Inventors
- 👤 Ahlen Karl Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:08
CPC Classifications
F; F16; F16D; F16D57/00; F16D57/06; B; B61; B61H; B61H11/00; B61H11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A HYDROSTATIC BRAKE FOR BRAKING A LOAD SHAFT CONNECTED TO THE LOAD TO BE BRAKED COMPRISING A POSITIVE DISPLACEMENT PUMP HAVING AN INPUT SHAFT, A THROTTLE VALVE FOR THROTTLING THE DISCHARGE FROM THE PUMP TO CREATE AND MAINTAIN BACK PRESSURE ON THE PUMP TO RESIST OPERATION THEREOF AND THEREBY PRODUCE A BRAKING EFFECT ON SAID LOAD SHAFT, A SERVO MOTOR RESPONSIVE TO THE DISCHARGE PRESSURE OF THE PUMP FOR ACTUATING SAID THROTTLE VALVE, A RELEASABLE CLUTCH COMPRISING A FIRST ELEMENT FOR DRIVING SAID INPUT SHAFT AND A SECOND ELEMENT FOR CONNECTION WITH SAID LOAD SHAFT, MEANS RESPONSIVE TO THE DISCHARGE PRESSURE OF THE PUMP FOR ENGAGING SAID CLUTCH, SELECTIVELY OPERABLE CONTROL MEANS FOR CONTROLLING SAID PRESSURE RESPONSIVE MEANS, AND STARTING MEANS FOR EFFECTING SUFFICIENT INITIAL ENGAGEMENT OF SAID CLUTCH TO START SAID PUMP AND CREATE A DISCHARGE PRESSURE FOR EFFECTING NORMAL LOAD CARRYING ENGAGEMENT OF SAID CLUTCH.
Claim 2
Dependent Claim
147 words
A HYDROSTATIC BRAKE FOR BRAKING A LOAD SHAFT CONNECTED TO THE LOAD TO BE BRAKED COMPRISING A POSITIVE DISPLACEMENT PUMP HAVING AN INPUT SHAFT, A THROTTLE VALVE FOR THROTTLING THE DISCHARGE FROM THE PUMP TO CREATE AND MAINTAIN BACK PRESSURE ON THE PUMP TO RESIST OPERATION THEREOF AND THEREBY PRODUCE A BRAKING EFFECT ON SAID LOAD SHAFT, A SERVO MOTOR RESPONSIVE TO THE DISCHARGE PRESSURE OF THE PUMP FOR ACTUATING SAID THROTTLE VALVE, A RELEASABLE CLUTCH COMPRISING A FIRST ELEMENT FOR DRIVING SAID INPUT SHAFT AND A SECOND ELEMENT FOR CONNECTION WITH SAID LOAD SHAFT, MEANS RESPONSIVE TO THE DISCHARGE PRESSURE OF THE PUMP FOR ENGAGING SAID CLUTCH, SELECTIVELY OPERABLE CONTROL MEANS FOR CONTROLLING SAID PRESSURE RESPONSIVE MEANS, AND STARTING MEANS FOR EFFECTING SUFFICIENT INITIAL ENGAGEMENT OF SAID CLUTCH TO START SAID PUMP AND CREATE A DISCHARGE PRESSURE FOR EFFECTING NORMAL LOAD CARRYING ENGAGEMENT OF SAID CLUTCH.
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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |