Patent US3648969A successfully refreshed from Google Patents.
US3648969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control device
Assignee: Gewerkschaft Eisenhutte Westfalia GmbH
•
Filing: 1970-03-30
•
Granted: 1972-03-14
•
Expires: 1990-03-30
Abstract
Abstract A hydraulic control device which uses throttle means preferably a one-way valve with a spring loaded ball to produce a differential pressure signal when pressure medium flows through the device. The pressure signal is used to move a piston which in turn actuates control means, such as a slide extension of the piston rod, to control the flow of pressure medium through control channels. The initiation of a working cycle effected by the flow of pressure medium through the control channels can thus be inhibited until the flow of pressure medium through the device has ceased indicating that a preceding working cycle has been completed.
Inventors
- 👤 Alfred Marquart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:54
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/06; F15B13/07
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
A hydraulic control device, said device comprising a. an input channel for receiving pressure medium, b. an output channel, c. means operably connected to both the input and output channels for producing a differential pressure signal when pressure medium flows from the input channel to the output channel, d. a piston movable within a cylinder, e. means communicating the differential pressure signal to the cylinder to cause the piston to move in response to said signal, and f. control means operably connected with said piston and adapted to perform a hydraulic control function in response to the movement of said piston.
Claim 2
Dependent Claim
101 words
A hydraulic control device, said device comprising a. an input channel for receiving pressure medium, b. an output channel, c. means operably connected to both the input and output channels for producing a differential pressure signal when pressure medium flows from the input channel to the output channel, d. a piston movable within a cylinder, e. means communicating the differential pressure signal to the cylinder to cause the piston to move in response to said signal, and f. control means operably connected with said piston and adapted to perform a hydraulic control function in response to the movement of said piston.
Claim 3
Dependent Claim
24 words
A device according to claim 1, wherein the means for producing the differential pressure signal is a one-way valve having a spring-loaded valve element.
Claim 4
Dependent Claim
46 words
A device according to claim 2, wherein the coMmunicating means comprises two feed channels, one extending from each operative side of the valve to a working chamber associated with the piston, and wherein there is further provided a throttle in one of said two feed channels.
Claim 5
Dependent Claim
38 words
A device according to claim 1, further comprising at least two pressure medium control channels, and wherein the control means is a slide attached to the piston and movable to block or open communication between said control channels.
Claim 6
Dependent Claim
27 words
A device according to claim 4, wherein said control channels communicate with each other when the means for producing a differential pressure produces a zero pressure signal.
Claim 7
Dependent Claim
23 words
A device according to claim 1, further comprising a throttle operably connected with the communicating means for modifying the response of the device.
Claim 8
Dependent Claim
12 words
A device according to claim 1, wherein the piston is spring loaded.
References Cited (Backward Citations)
US2896903A
Cited
US3176591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |