US3603248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for driving the platen of a press
Assignee: Inventions Finance Corp
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Filing: 1969-07-01
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Granted: 1971-09-07
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Expires: 1989-07-01
Abstract
Abstract A device for driving the platen of a press, a piston mounted to slide in a cylinder unit, said piston being hydraulically driven, and another piston mounted to slide in a bore of the first piston, said second piston being securely fixed to said platen, and said first piston having means for locking said second piston in its bore, so that said platen can be subjected to a rapid positioning movement by the displacement of said second piston and to a slower movement by the displacement of said first piston when the latter is subjected to high pressure, the movement of said first piston being transmitted to said platen by said locking means.
Inventors
- 👤 Robert Ange Marie Nouel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:30
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/67; B29C45/6707; B29C45/6714; Y; Y10; Y10S; Y10S425/00; Y10S425/223
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
256 words
A device for driving the platen of a press, comprising a frame, a fixed platen and a movable platen mounted on said frame, a cylinder secured to said frame, a piston having a smooth, uninterrupted bore and mounted to slide in said cylinder, a second piston having a smooth uninterrupted outer surface slidably engaged in said bore of the first piston, said second piston being connected at one end thereof to said movable platen so as to move the latter axially of the cylinder and the connection being such as to prevent relative rotation of the second piston and the movable platen, and means for locking said second piston in the bore of the first piston, so that said platen can be subjected to a rapid positioning movement by the displacement of said second piston and to a slower movement by the displacement of said first piston when the latter is subjected to high pressure, the movement of said first piston being transmitted to said platen by said locking means, said locking means including a cavity in the wall of said first piston opening into the bore of the first piston, a claw mounted to slide in said cavity from a retracted position wholly therein to a locking position partly extended into the bore of the first piston and behind the other end of said second piston so as to prevent displacement of the second piston axially of the first piston, and pressure fluid means for selectively moving said claw to its retracted and locking positions.
Claim 2
Independent Claim
256 words
A device for driving the platen of a press, comprising a frame, a fixed platen and a movable platen mounted on said frame, a cylinder secured to said frame, a piston having a smooth, uninterrupted bore and mounted to slide in said cylinder, a second piston having a smooth uninterrupted outer surface slidably engaged in said bore of the first piston, said second piston being connected at one end thereof to said movable platen so as to move the latter axially of the cylinder and the connection being such as to prevent relative rotation of the second piston and the movable platen, and means for locking said second piston in the bore of the first piston, so that said platen can be subjected to a rapid positioning movement by the displacement of said second piston and to a slower movement by the displacement of said first piston when the latter is subjected to high pressure, the movement of said first piston being transmitted to said platen by said locking means, said locking means including a cavity in the wall of said first piston opening into the bore of the first piston, a claw mounted to slide in said cavity from a retracted position wholly therein to a locking position partly extended into the bore of the first piston and behind the other end of said second piston so as to prevent displacement of the second piston axially of the first piston, and pressure fluid means for selectively moving said claw to its retracted and locking positions.
Claim 3
Dependent Claim
21 words
A device according to claim 1, in which the first piston forms the piston of a pressure fluid double-acting shifting device.
Claim 4
Dependent Claim
23 words
A device according to claim 1, in which the secOnd piston forms the piston of a pressure fluid shifting device with differential pressure.
Claim 5
Dependent Claim
59 words
A device according to claim 1, in which the second piston forms the piston of a pressure fluid shifting device for displacement in one direction and is subjected to the action of at least one separate pressure fluid shifting device for displacement in the opposite direction, the latter shifting device being mounted in the cylinder of the first piston.
Claim 6
Dependent Claim
33 words
A device according to claim 1, in which the second piston is securely connected to at least one double-acting pressure fluid shifting device which is mounted in the cylinder of the first piston.
Claim 7
Dependent Claim
32 words
A device according to claim 1, which further comprises an ejection rod which is coaxial to the two pistons, the latter being hollow in order to form a passage for said rod.
Claim 8
Dependent Claim
34 words
A device according to claim 1, in which the second piston is connected to said platen by a screwnut assembly which enables the distance between the platen and the second piston to be adjusted.
Claim 9
Dependent Claim
50 words
A device according to claim 1, in which the platen of the press is guided by four columns, the cylinder unit of the first piston being mounted in the upper part of these columns, so that the two pistons are vertical and the platen is subjected to a vertical displacement.
Claim 10
Dependent Claim
22 words
A device according to claim 1, in which the locking means are constituted by a single horseshoe-shaped claw, actuated by a jack.
Claim 11
Dependent Claim
35 words
A device according to claim 1, in which the second piston is internally guided in a fixed tube, the conduits of the pressure fluid circuit actuating the second piston being formed in the fixed tube.
Claim 12
Dependent Claim
37 words
A device according to claim 1, in which the first piston is made in two parts, said locking means comprising two cavities and two locking claws housed in said cavities in the connection zone of these parts.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |