Patent US3885465A successfully refreshed from Google Patents.
US3885465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic support for the movably supported roller in roll presses
Assignee: BERGENDAHL HANS#GEORG
•
Filing: 1974-02-06
•
Granted: 1975-05-27
•
Expires: 1994-02-06
Abstract
Abstract A hydraulic support for the movably supported roller in roll presses in which the hydraulic circuit includes a motor pump, a maximum-minimum pressure switch and a safety valve. The circuit further includes a pressure-limiting valve set for an operational pressure corresponding to a predetermined pressing force in the roller gap and slightly higher than the minimum pressure at which the maximum-minimum pressure switch is set. The operational pressure in the support may thus be kept constant notwithstanding fluctuations in the load pressure.
Inventors
- 👤 Hans-Georg Bergendahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:47
CPC Classifications
B; B30; B30B; B30B3/00; B30B3/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
181 words
A hydraulic support for the bearing blocks of a movable roller in a roll press having a frame and two rollers having a gap therebetween, one of said rollers being radially movable away from and toward the other of said rollers, said support comprising: at least one hydraulic cylinder for each bearing block, mounted between the press frame and the side of the bearing block which is away from the roller gap; and a hydraulic circuit connected to said cylinder; a motor pump for supplying hydraulic fluid through said circuit to said cylinder; a maximum-minimum pressure switch within said circuit for starting said motor pump when a predetermined minimum pressure is reached in said circuit and for stopping said motor pump when a predetermined maximum pressure is reached in said circuit; a pressurized hydraulic storage tank in said circuit; and a pressure-limiting valve connected to said hydraulic circuit for releasing sufficient amounts of hydraulic fluid from said circuit, when the pressure within said circuit exceeds a predetermined operating pressure, to keep the pressure within said circuit at said predetermined operating pressure.
Claim 2
Dependent Claim
181 words
A hydraulic support for the bearing blocks of a movable roller in a roll press having a frame and two rollers having a gap therebetween, one of said rollers being radially movable away from and toward the other of said rollers, said support comprising: at least one hydraulic cylinder for each bearing block, mounted between the press frame and the side of the bearing block which is away from the roller gap; and a hydraulic circuit connected to said cylinder; a motor pump for supplying hydraulic fluid through said circuit to said cylinder; a maximum-minimum pressure switch within said circuit for starting said motor pump when a predetermined minimum pressure is reached in said circuit and for stopping said motor pump when a predetermined maximum pressure is reached in said circuit; a pressurized hydraulic storage tank in said circuit; and a pressure-limiting valve connected to said hydraulic circuit for releasing sufficient amounts of hydraulic fluid from said circuit, when the pressure within said circuit exceeds a predetermined operating pressure, to keep the pressure within said circuit at said predetermined operating pressure.
Claim 3
Dependent Claim
18 words
A hydraulic support in accordance with claim 1 further including a safety valve connected to said hydraulic circuit.
Claim 4
Dependent Claim
21 words
A hydraulic support in accordance with claim 1 wherein said predetermined minimum pressure is slightly lower than said predetermined operating pressure.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |