Patent US3922853A successfully refreshed from Google Patents.
US3922853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control device
Assignee: Alstom Power Turbinen GmbH
•
Filing: 1974-06-13
•
Granted: 1975-12-02
•
Expires: 1994-06-13
Abstract
Abstract A speed control device working with hydraulic fluid makes use of a displacement type pump. The pressure head delivered by the pump is used directly as control pressure actuating a servo-motor. The pressure head is dependent upon the pump speed which, in turn, is a function of the speed to be controlled. The regulating range of the pressure head of the pump is increased by a differential pressure controller, making use of a nozzle member, cooperating with a diaphragm and a throttle plate.
Inventors
- 👤 Hans Kalb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:52
CPC Classifications
G; G05; G05D; G05D13/00; G05D13/08; G05D13/30; G05D13/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A speed control device working with hydraulic fluid and including a displacement type pump, comprising an adjustable orifice being the inlet of a valve chamber that communicates through said orifice with the hIgh pressure side of said pump, and a differential pressure controller including a valve forming a first outlet of said valve chamber, said valve including a nozzle member and a throttle plate carried by a diaphragm and cooperating with the mouth of said nozzle member opening into said valve chamber, the said diaphragm being charged from within the valve chamber by a spring force, the said diaphragm and throttle plate being one wall of said valve chamber separating it from an additional chamber, the additional chamber communicating with the high pressure side of said displacement type pump and with a second, main outlet of said valve chamber through a throttling device, the said main outlet of said valve chamber delivering the control pressure actuating a piston of a servomotor.
Claim 2
Dependent Claim
161 words
A speed control device working with hydraulic fluid and including a displacement type pump, comprising an adjustable orifice being the inlet of a valve chamber that communicates through said orifice with the hIgh pressure side of said pump, and a differential pressure controller including a valve forming a first outlet of said valve chamber, said valve including a nozzle member and a throttle plate carried by a diaphragm and cooperating with the mouth of said nozzle member opening into said valve chamber, the said diaphragm being charged from within the valve chamber by a spring force, the said diaphragm and throttle plate being one wall of said valve chamber separating it from an additional chamber, the additional chamber communicating with the high pressure side of said displacement type pump and with a second, main outlet of said valve chamber through a throttling device, the said main outlet of said valve chamber delivering the control pressure actuating a piston of a servomotor.
Claim 3
Dependent Claim
29 words
Speed control device according to claim 1, wherein said additional chamber communicates with the high pressure side of said displacement type pump through a viscosity - dependent throttling device.
Claim 4
Dependent Claim
28 words
Speed control device according to claim 1, wherein said nozzle has a nozzle bore, the outlet of which opposite the nozzle mouth is governed by a second valve.
Claim 5
Dependent Claim
18 words
Speed control device according to claim 3, wherein said second valve is a ball biased by a spring.
Claim 6
Dependent Claim
109 words
Speed control device according to claim 4, wherein said control device and said servo-motor are arranged in one housing, said servo-motor including a piston and a piston rod movable in a piston chamber of said housing, a first part of said piston chamber being the pressure side where the control pressure is actuating the piston, a second part of said piston chamber situated on the other side of said piston being provided with an outlet for the flow-off of pressure oil, the said nozzle bore communicating with said second part of said piston chamber through said second valve, said spring biasing the valve ball being supported by said piston.
Claim 7
Dependent Claim
25 words
Speed control device according to claim 5, wherein said piston is biased by a second spring provided in said second part of said piston chamber.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |