Patent US4933373A successfully refreshed from Google Patents.
Patent US3590581A successfully refreshed from Google Patents.
US3590581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling the feeding of hydraulic power devices
Assignee: Individual
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Filing: 1969-04-22
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Granted: 1971-07-06
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Expires: 1989-04-22
Abstract
Abstract Device for controlling the feeding of a plurality of hydraulic power devices comprising a plurality of cavities, each communicating, at one of its ends, with one of the said power devices and in each of which slides a piston for feeding one power device, the said feed pistons being connected to a common driving member which displaces the same simultaneously in translation in one direction and the other, so that the said pistons discharge the hydraulic fluid from the cavities into the associated power devices and suck the said fluid from the power devices into the cavities according to their direction of displacement.
Inventors
- 👤 Vittorio Louis Achille Bianchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:50
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/16; B30B15/24; F; F15; F15B; F15B11/00; F15B11/16; F15B11/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
320 words
In a hydraulic press having a movable pressing element, a plurality of hydraulic power devices for actuating said pressing element, each one of said hydraulic power devices having a chamber, a reciprocally moving piston in said chamber and a stop member of adjustable length, a device for controlling the feeding of said hydraulic power devices, said device comprising a plurality of cavities containing a hydraulic fluid, each cavity communicating, at one of its ends, with one of the said power devices, a movable feed piston in each one of said cavities for feeding the associated power device, an inner chamber, a hydraulically controlled and reciprocally movable driving member located in said chamber and connected to said feed pistons whereby the latter are displaced simultaneously in translation in one direction or the other, and discharge said hydraulic fluid from said cavities into said associated power devices or suck said fluid from said power devices into said cavities according to their direction of displacement, makeup hydraulic fluid container connected to said cavities and means for feeding periodically said cavities with said makeup hydraulic fluid and maintaining constant the volume of the hydraulic fluid contained in each cavity and its associated power device, said cavities being arranged side by side and open, at their ends opposite to those communicating with said power devices, in said inner chamber and said driving member being constituted by a hollow cylinder having a front wall and rear face, said cylinder being mounted slidably relative to a fixed piston and within which a pressure fluid is admitted for causing it to move with respect to said fixed piston, each aforesaid feed piston being provided with a rod having a free end connected by means of resilIent fixing members to the front wall of the said cylinder, so that it is alternately pushed by said cylinder or drawn by the latter through the medium of said resilient fixing members.
Claim 2
Dependent Claim
320 words
In a hydraulic press having a movable pressing element, a plurality of hydraulic power devices for actuating said pressing element, each one of said hydraulic power devices having a chamber, a reciprocally moving piston in said chamber and a stop member of adjustable length, a device for controlling the feeding of said hydraulic power devices, said device comprising a plurality of cavities containing a hydraulic fluid, each cavity communicating, at one of its ends, with one of the said power devices, a movable feed piston in each one of said cavities for feeding the associated power device, an inner chamber, a hydraulically controlled and reciprocally movable driving member located in said chamber and connected to said feed pistons whereby the latter are displaced simultaneously in translation in one direction or the other, and discharge said hydraulic fluid from said cavities into said associated power devices or suck said fluid from said power devices into said cavities according to their direction of displacement, makeup hydraulic fluid container connected to said cavities and means for feeding periodically said cavities with said makeup hydraulic fluid and maintaining constant the volume of the hydraulic fluid contained in each cavity and its associated power device, said cavities being arranged side by side and open, at their ends opposite to those communicating with said power devices, in said inner chamber and said driving member being constituted by a hollow cylinder having a front wall and rear face, said cylinder being mounted slidably relative to a fixed piston and within which a pressure fluid is admitted for causing it to move with respect to said fixed piston, each aforesaid feed piston being provided with a rod having a free end connected by means of resilIent fixing members to the front wall of the said cylinder, so that it is alternately pushed by said cylinder or drawn by the latter through the medium of said resilient fixing members.
Claim 3
Dependent Claim
92 words
A hydraulic press according to claim 1, wherein each aforesaid feed piston and its associated rod are traversed by a conduit opening at the free end of said rod the travel of said feed piston being slightly less than that of the said cylinder, so that at the end of each stage of traction of the said feed piston, the front face of said cylinder moves away from said rod and frees said conduit, thus making each cavity communicate with said inner chamber, the latter communicating with said makeup hydraulic fluid container.
Claim 4
Dependent Claim
74 words
A hydraulic press according to claim 2, wherein said inner chamber is connected at its end opposite to that communicating with the aforesaid cavities, to a hydraulic circuit operating the aforesaid cylinder, a calibrated valve being in said hydraulic circuit to control the inflow of fluid into the said chamber, the action of said fluid on the rear face of the said cylinder adding to the action of the fluid admitted into said cylinder.
Claim 5
Dependent Claim
31 words
A hydraulic press according to claim 1, wherein the aforesaid stop member of each one of said power devices is constituted by a threaded rod mounted in a rotatable threaded sleeve.
Claim 6
Dependent Claim
22 words
A hydraulic press according to claim 4, wherein the aforesaid sleeves are rotated jointly by a transmission chain driven by a motor.
Claim 7
Dependent Claim
299 words
In a hydraulic press having a movable pressing element, a plurality of hydraulic power devices for actuating said pressing element, each one of said hydraulic power devices having a chamber, a reciprocally moving piston in said chamber and a stop member of adjustable length, a device for controlling the feeding of said hydraulic power devices, said device comprising a plurality of cavities containing a hydraulic fluid, each cavity communicating, at one of its ends, with one of the said power devices, a movable feed piston in each one of said cavities for feeding the associated power device, an inner chamber, a hydraulically controlled and reciprocally movable driving member located in said chamber and connected to said feed pistons whereby the latter are displaced simultaneously in translation in one direction or the other, and discharge said hydraulic fluid from said cavities into said associated power devices or suck said fluid from said power devices into said cavities according to their direction of displacement, makeup hydraulic fluid container connected to said cavities and means for feeding periodically said cavities with said makeup hydraulic fluid and maintaining constant the volume of the hydraulic fluid contained in each cavity and its associated power device, said cavities being aligned with one and another and arranged coaxially with said inner chamber, said driving member being constituted by a driving piston rigid with said feed pistons, so that the said feed pistons are driven simultaneously in one direction or the other by driving piston, each power device and its associated cavity being connected to said makeup hydraulic fluid container through the medium of a valve controlled by the displacement of all the aforesaid pistons, the said valve being provided to set up the communication at the end of each sucking stage of the aforesaid feed pistons.
Claim 8
Dependent Claim
299 words
In a hydraulic press having a movable pressing element, a plurality of hydraulic power devices for actuating said pressing element, each one of said hydraulic power devices having a chamber, a reciprocally moving piston in said chamber and a stop member of adjustable length, a device for controlling the feeding of said hydraulic power devices, said device comprising a plurality of cavities containing a hydraulic fluid, each cavity communicating, at one of its ends, with one of the said power devices, a movable feed piston in each one of said cavities for feeding the associated power device, an inner chamber, a hydraulically controlled and reciprocally movable driving member located in said chamber and connected to said feed pistons whereby the latter are displaced simultaneously in translation in one direction or the other, and discharge said hydraulic fluid from said cavities into said associated power devices or suck said fluid from said power devices into said cavities according to their direction of displacement, makeup hydraulic fluid container connected to said cavities and means for feeding periodically said cavities with said makeup hydraulic fluid and maintaining constant the volume of the hydraulic fluid contained in each cavity and its associated power device, said cavities being aligned with one and another and arranged coaxially with said inner chamber, said driving member being constituted by a driving piston rigid with said feed pistons, so that the said feed pistons are driven simultaneously in one direction or the other by driving piston, each power device and its associated cavity being connected to said makeup hydraulic fluid container through the medium of a valve controlled by the displacement of all the aforesaid pistons, the said valve being provided to set up the communication at the end of each sucking stage of the aforesaid feed pistons.
Claim 9
Dependent Claim
45 words
A hydraulic press according to claim 6, wherein the aforesaid stop member of each one of said power devices is constituted by a threaded rod mounted in a rotatable threaded sleeve, the aforesaid sleeves being rotated jointly by a transmission chain driven by a motor.
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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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |