Patent US4094144A successfully refreshed from Google Patents.
US4094144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pressure regulating arrangement
Assignee: STROJARSKE A METALURGICKE ZAVODY
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Filing: 1977-03-16
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Granted: 1978-06-13
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Expires: 1997-03-16
Abstract
Abstract A constant pressure at the output of a pressure regulator is adjusted to and maintained at a required value by hydraulic remote control of a sliding valve in operative association with a control cylinder responsive to actual pressure conditions. The position of the piston of the control cylinder is determined both by a pilot pressure and by the pressure prevailing at the output of the regulator.
Inventors
- 👤 Pavel Italy
- 👤 Ondrej Kilik
- 👤 Jozef Barancok
- 👤 Anton Miski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:05
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/42; F16H61/433; F16H59/00; F16H59/68; F16H2059/6838; F16H2059/6861
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
An arrangement for automatically controlling hydraulic pressure, comprising: a hydrostatic pump having an inlet and outlet pressure conduit, a servocylinder coupled to said hydrostatic pump and having a control piston to control the fluid volume thereof, a slide valve having an inlet conduit, a piston, and first and second outlet conduits, a control cylinder having a control pressure inlet and outlet, a piston within said control cylinder connected to the piston of said slide valve, a spring within said control cylinder acting on said piston thereof in one direction, a plunger connected to said control cylinder piston, a double acting return valve connected between the inlet and outlet pressure conduits of the hydrostatic pump, said return valve controlling via a pressure conduit the position of said plunger, the first and second outlet conduits of the slide valve being connected to the servocylinder of the hydrostatic pump.
Claim 2
Dependent Claim
146 words
An arrangement for automatically controlling hydraulic pressure, comprising: a hydrostatic pump having an inlet and outlet pressure conduit, a servocylinder coupled to said hydrostatic pump and having a control piston to control the fluid volume thereof, a slide valve having an inlet conduit, a piston, and first and second outlet conduits, a control cylinder having a control pressure inlet and outlet, a piston within said control cylinder connected to the piston of said slide valve, a spring within said control cylinder acting on said piston thereof in one direction, a plunger connected to said control cylinder piston, a double acting return valve connected between the inlet and outlet pressure conduits of the hydrostatic pump, said return valve controlling via a pressure conduit the position of said plunger, the first and second outlet conduits of the slide valve being connected to the servocylinder of the hydrostatic pump.
Claim 3
Dependent Claim
23 words
The arrangement according to claim 1, wherein the slide valve piston is connected to the piston of the control cylinder by resilient means.
Claim 4
Dependent Claim
34 words
The arrangement according to claim 1, further comprising a double acting accumulator and a hydraulic resistance connected in series between the first and second outlet conduits of the slide valve, thus by-passing the servocylinder.
Claim 5
Dependent Claim
29 words
The arrangement according to claim 3, comprising damping cylinders coupled to both sides of the slide valve piston, each damping cylinder having a chamber communicating with said hydraulic resistance.
Claim 6
Dependent Claim
45 words
The arrangement according to claim 1, further comprising hydraulic resistances in the first outlet conduit and in the second outlet conduit of the slide valve, in the pressure conduit between said return valve and said plunger and in the inlet conduit of the slide valve.
Claim 7
Dependent Claim
39 words
The arrangement according to claim 1, comprising an auxiliary servocylinder coupled between said slide valve outlet conduits and said first mentioned servocylinder for controlling the movement of the control piston of said first mentioned servocylinder through a mechanical linkage.
References Cited (Backward Citations)
US2821173A
Cited
US3685290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |