Patent US2110230A successfully refreshed from Google Patents.
US3756145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic press
Assignee: AMACKER AND SCHMID AG
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Filing: 1971-10-21
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Granted: 1973-09-04
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Expires: 1991-10-21
Abstract
Abstract For consecutively effecting, in each pressing operation of a hydraulic press, an approach stroke at high speed and under low power, and a pressing stroke at low speed but substantially greater power, the invention uses two hydraulic pressing units, such as cylinder-piston-units, mounted in tandem between a stationary machine frame and a movable pressing member, one of the two pressing units having a substantially greater effective surface area, for example piston area, than the other unit. Manually operable or automatic control means are provided for admitting pressure fluid, in a first phase of each pressing operation, into the pressing unit having the smaller effective surface area to effect the approach stroke, and for then locking this unit and admitting pressure fluid into the pressing unit having the greater effective surface area to effect the pressing stroke. Both a high speed during the approach stroke and a high power during the pressing stroke may thus be achieved with a relatively reduced output from the pressure fluid pumping means.
Inventors
- 👤 A Amacker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:00
CPC Classifications
B; B30; B30B; B30B1/00; B30B1/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
204 words
A press having a high speed, low power approach stroke and a higher power, lower speed pressing stroke, which comprises: a. a stationary machine frame; b. a moveable pressing member; c. a first pressing unit comprising a first compression chamber which is displaceable relative to said stationary machine frame and a first transfer member moveable in said first compression chamber having a first effective surface area and connected at one end to said pressing member; d. a second pressing unit comprising a second compression chamber which is sealed off from said first compression chamber, having a wall which is rigidly secured to said stationary machine frame, and second transfer means moveable in said second compressiOn chamber having a second effective surface area, said first compression chamber being rigidly secured to said second transfer means and operative to move with said second transfer means, said second effective surface area being greater than said first effective surface area; and e. means for supplying and withdrawing pressurized fluid to said compression chambers, including means for fluidly locking said first transfer member at any point of its travel during said approach stroke, said first transfer member, when fluidly locked, being operative to move with said first compression chamber.
Claim 2
Dependent Claim
204 words
A press having a high speed, low power approach stroke and a higher power, lower speed pressing stroke, which comprises: a. a stationary machine frame; b. a moveable pressing member; c. a first pressing unit comprising a first compression chamber which is displaceable relative to said stationary machine frame and a first transfer member moveable in said first compression chamber having a first effective surface area and connected at one end to said pressing member; d. a second pressing unit comprising a second compression chamber which is sealed off from said first compression chamber, having a wall which is rigidly secured to said stationary machine frame, and second transfer means moveable in said second compressiOn chamber having a second effective surface area, said first compression chamber being rigidly secured to said second transfer means and operative to move with said second transfer means, said second effective surface area being greater than said first effective surface area; and e. means for supplying and withdrawing pressurized fluid to said compression chambers, including means for fluidly locking said first transfer member at any point of its travel during said approach stroke, said first transfer member, when fluidly locked, being operative to move with said first compression chamber.
Claim 3
Dependent Claim
34 words
A press as claimed in claim 1, wherein said second effective surface area of said second transfer means is at least 10 times greater than said effective surface area of said first transfer member.
Claim 4
Dependent Claim
25 words
A press as claimed in claim 2, wherein said second effective surface area is 30 to 100 times greater than said first effective surface area.
Claim 5
Dependent Claim
97 words
A press as claimed in claim 1 wherein said means for supplying and withdrawing pressurized fluid comprise a plurality of pressure fluid conduits to said compression chambers, at least one valve in each of said pressure fluid conduits, and a control unit for operating said valves, said control unit being operable first to open at least one valve in a conduit to said first pressing unit, to close this valve again after an approach stroke has been carried out by said pressing member, and then to open a valve in a conduit to said second pressing unit.
Claim 6
Dependent Claim
45 words
A press as claimed in claim 4, wherein said first compression chamber comprises a fixed wall and wherein a valve in said conduIt to said first pressing unit is arranged directly on said fixed wall of said first compression chamber of said first pressing unit.
Claim 7
Dependent Claim
44 words
A press as claimed in claim 4, wherein at least one spring is provided between a part rigidly connected to said pressing member and a part rigidly connected to said machine frame for the purpose of returning the pressing member to its starting position.
Claim 8
Dependent Claim
40 words
A press as claimed in claim 4 wherein said at least one valve to said conduit to said first pressing unit may be closed when said first transfer member is at any point of its travel during said approach stroke.
Claim 9
Dependent Claim
32 words
A press as claimed in claim 1, wherein said first compression chamber comprises a cylinder in which is displaceably arranged said first transfer member, said first transfer member being a press piston.
Claim 10
Dependent Claim
20 words
A press as claimed in claim 8, wherein said second transfer means of said second pressing unit comprises a diaphragm.
Claim 11
Dependent Claim
71 words
A press as claimed in claim 9, wherein said diaphragm is secured to a part which is rigidly connected to said machine frame, this part forming a fixed wall of said second compression chamber of said second pressing unit, said second transfer means further comprising a second transfer member bearing against said diaphragm, and said cylinder bearing against second transfer member, said press piston being rigidly coupled to said pressing member.
References Cited (Backward Citations)
US512790A
Cited
US1062289A
Cited
US1955278A
Cited
US1937007A
Cited
US2786409A
Cited
US3290919A
Cited
US3315594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |