US4170876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling a press plunger system
Assignee: Individual
•
Filing: 1977-06-09
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Granted: 1979-10-16
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Expires: 1997-06-09
Abstract
Abstract A drive system for use in a press in which a pneumatic cylinder and hydraulic pressure transformer are coupled together and connected by separate valves to respective gas and hydraulic sources. The valves are controlled by position transducers arranged along the path of movement of the output member of the transformer.
Inventors
- 👤 Herbert R. Dits
- 👤 Egon A. J. Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:22
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/06; F15B11/072; F15B11/0725; F15B11/02; F15B11/028; F15B11/032; F15B11/0325; F15B3/00; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/21; F15B2211/216; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/3056; F15B2211/30565; F15B2211/3057; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/415; F15B2211/41581; F15B2211/42; F15B2211/426; F15B2211/46; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/50536; F15B2211/515; F15B2211/5151; F15B2211/5159; F15B2211/55; F15B2211/555; F15B2211/60; F15B2211/615; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/76
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
158 words
A hydro-pneumatic drive system for use in a press having a press plunger comprising: a pneumatic cylinder assembly adapted to be connected to a pressure gas source; a hydraulic pressure transformer, the input member of which is connected to the output member of the pneumatic cylinder assembly and the output member of which is connected to the press plunger; a first control valve means for connecting the pressure gas source to the pneumatic cylinder assembly; a second control valve means for connecting the working space of the pressure transformer to a pressure liquid pump; an actuating member mounted for common movement with the output member of the pressure transformer; and a plurality of position transducers arranged along the path of the output member of the pressure transformer, each of said position transducers being adapted to effect either opening or closing of at least one of the control valve means in accordance with the position of said output member.
Claim 2
Dependent Claim
158 words
A hydro-pneumatic drive system for use in a press having a press plunger comprising: a pneumatic cylinder assembly adapted to be connected to a pressure gas source; a hydraulic pressure transformer, the input member of which is connected to the output member of the pneumatic cylinder assembly and the output member of which is connected to the press plunger; a first control valve means for connecting the pressure gas source to the pneumatic cylinder assembly; a second control valve means for connecting the working space of the pressure transformer to a pressure liquid pump; an actuating member mounted for common movement with the output member of the pressure transformer; and a plurality of position transducers arranged along the path of the output member of the pressure transformer, each of said position transducers being adapted to effect either opening or closing of at least one of the control valve means in accordance with the position of said output member.
Claim 3
Dependent Claim
27 words
A drive system as in claim 1, wherein the working space of the pressure transformer is connected to a liquid return line through a pressure limiting valve.
Claim 4
Dependent Claim
42 words
A drive system as in claim 1, further including a hydraulic cylinder assembly having its piston rod connected to the piston rod of the pneumatic cylinder assembly, and a third control valve means for connecting said cylinder assembly to said liquid pump.
Claim 5
Dependent Claim
50 words
A drive system as in claim 3, wherein said hydraulic cylinder assembly includes a plurality of hydraulic cylinders, a plurality of separate pressure limiting valves connecting said cylinder assembly to a return line and wherein said third assembly includes separate control valves for connecting said cylinder assembly to said pump.
References Cited (Backward Citations)
US2962001A
Cited
US3942323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |