Patent US3722365A successfully refreshed from Google Patents.
US3722365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pressure apparatus
Assignee: Essar Corp
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Filing: 1972-02-14
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Granted: 1973-03-27
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Expires: 1992-02-14
Abstract
Abstract An electrical discharge machining device or EDM machine having a head carrying an electrode which is movable toward and away from a work piece by a hydraulically operated double acting cylinder. A control valve, combined with a servo solenoid and manually operated lever, is operable to control the flow of hydraulic fluid to the cylinder. A light responsive electrical control operates the servo solenoid in response to the size of the electrical discharge gap between the electrode and the work piece. Interposed in the fluid line to the hydraulic cylinder is a lock valve operable to lock the cylinder and fix the position of the electrode relative to the work piece. The manually controlled lever is operable to engage switches to override the lock valve control during the electrical machining and elevation of the electrode operations of the device. Hydraulic pressure is continuously supplied to the control valve from a pair of liquid storing chambers connected to the control valve with a switching valve. Fluid under pressure in either one of the chambers operates a switching valve to provide a continuous source of hydraulic fluid under pressure to the control valve. The head contains the hydraulic pressure source, control valve, EDM power supply, electric control circuit for the valve and the double acting cylinder.
Inventors
- 👤 S Olsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:38
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18; B23H7/26; B23H7/265
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
261 words
An apparatus for supplying a substantially continuous source of hydraulic fluid under pressure to a hydraulic fluid receiving means comprising: first means having a first hydraulic fluid storing chamber, second means having a second hydraulic fluid storage chamber, first valve means connected to said first chamber and said second chamber and adapted to be connected to a first fluid under pressure, said first valve means having a first position to direct the first fluid to the first chamber and exhaust the first fluid from the second chamber and a second position to exhaust the first fluid from the first chamber and to direct the first fluid to the second chamber, first control means operable to selectively locate the first valve means in the first position and second position, second valve means connected to said first chamber and said second chamber and adapted to be connected to said receiving means, said second valve means having a first position to direct pressurized hydraulic fluid from the first chamber to the receiving means and to direct hydraulic fluid from the receiving means to the second chamber and a second position to direct hydraulic fluid from the secoNd chamber to the receiving means and to direct pressurized hydraulic fluid from the receiving means to the first chamber, and second control means to operate the second valve means, said second control means comprising pilot means connected to said first chamber and said second chamber operable to actuate the second valve means in response to the pressures of hydraulic fluid in the first chamber and second chamber.
Claim 2
Independent Claim
261 words
An apparatus for supplying a substantially continuous source of hydraulic fluid under pressure to a hydraulic fluid receiving means comprising: first means having a first hydraulic fluid storing chamber, second means having a second hydraulic fluid storage chamber, first valve means connected to said first chamber and said second chamber and adapted to be connected to a first fluid under pressure, said first valve means having a first position to direct the first fluid to the first chamber and exhaust the first fluid from the second chamber and a second position to exhaust the first fluid from the first chamber and to direct the first fluid to the second chamber, first control means operable to selectively locate the first valve means in the first position and second position, second valve means connected to said first chamber and said second chamber and adapted to be connected to said receiving means, said second valve means having a first position to direct pressurized hydraulic fluid from the first chamber to the receiving means and to direct hydraulic fluid from the receiving means to the second chamber and a second position to direct hydraulic fluid from the secoNd chamber to the receiving means and to direct pressurized hydraulic fluid from the receiving means to the first chamber, and second control means to operate the second valve means, said second control means comprising pilot means connected to said first chamber and said second chamber operable to actuate the second valve means in response to the pressures of hydraulic fluid in the first chamber and second chamber.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 including: a base member supporting the first means and second means.
Claim 4
Dependent Claim
117 words
The apparatus of claim 1 wherein: the first control means includes a solenoid to operate the first valve means, a pair of switches located adjacent upper and lower portions of one of the chambers and connected to the solenoid, float means in said one chamber for actuating said switches in response to the level of hydraulic fluid in said one chamber, said upper switch operable to actuate the solenoid to locate the first valve means in its first position whereby the first fluid is supplied to the first chamber, said lower switch operable to actuate the solenoid to locate the first valve means in its second position whereby the first fluid is exhausted from the first chamber.
Claim 5
Dependent Claim
50 words
The apparatus of claim 1 wherein: the pilot means includes a first pilot cylinder connected to the first chamber and a second pilot cylinder connected to the second chamber, said pilot cylinders operable to actuate the second valve means in response to the application of pressure to either pilot cylinder.
Claim 6
Dependent Claim
33 words
The apparatus of claim 1 wherein: the first control means includes switch means in response to the level of hydraulic fluid in at least one chamber to selectively operate the first valve means.
Claim 7
Dependent Claim
31 words
The apparatus of claim 1 wherein: the first control means includes means responsive to the level of hydraulic fluid in at least one chamber to selectively operate the first valve means.
Claim 8
Dependent Claim
28 words
The apparatus of claim 1 wherein: the first valve means is connected to upper portions of said first chamber and connected to upper portions of said second chamber.
Claim 9
Dependent Claim
27 words
The apparatus of claim 1 wherein: the second valve means is connected to lower portions of said first chamber and to lower portions of said second chamber.
Claim 10
Dependent Claim
21 words
The apparatus of claim 1 wherein: the first means is an upright cylinder and the second means is an upright cylinder.
Claim 11
Dependent Claim
15 words
The apparatus of claim 9 wherein: both upright cylin-ders are mounted on a common support.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |