US3583282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic system
Assignee: MORGEN Manufacturing Co
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Filing: 1969-09-11
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Granted: 1971-06-08
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Expires: 1989-09-11
Abstract
Abstract An improved hydraulic system comprising a pair of hydraulic cylinders adapted to be used to operate devices requiring reciprocatory power inputs. Each of the hydraulic cylinders has a piston positioned for reciprocal movement therein, and the hydraulic cylinders are arranged so that the pistons move together in a master-slave relationship. A novel bypass arrangement is utilized to compensate for the loss, through leakage, of hydraulic fluid in the system. At the beginning of each stroke of the pistons, additional hydraulic fluid is introduced into the portion of the hydraulic cylinders between the piston in excess of that necessary to cause the pistons to move through their complete stroke, and at the end of each stroke of the pistons, this additional hydraulic fluid is removed from the system. This arrangement assures that the amount of hydraulic fluid in the closed portion of the system never falls below that necessary to cause the pistons to move through their complete strokes.
Inventors
- 👤 James L Cope
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:25
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/22; F15B11/20; F15B11/205
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
490 words
An improved hydraulic system comprising; a first hydraulic cylinder having a sidewall and first and second closed end walls; a first piston positioned within the first hydraulic cylinder for reciprocal movement therein in a direction parallel to the central longitudinal axis of the first hydraulic cylinder; a first piston rod secured to one face of the first piston and extending from the first hydraulic cylinder through a sealed aperture in one of the end walls thereof; a second hydraulic cylinder having a sidewall and first and second closed end walls; a second piston positioned within the second hydraulic cylinder for reciprocal movement therein in a direction parallel to the central longitudinal axis of the second hydraulic cylinder; a second piston rod secured to one face of the second piston and extending from the second hydraulic cylinder through a sealed aperture in one of the end walls thereof; means for permitting fluid communication between the first hydraulic cylinder, adjacent to its first end wall, and the second hydraulic cylinder, adjacent to its first end wall; pump means for pumping hydraulic fluid; sump means for receiving hydraulic fluid; first conduit means adapted to be selectively and alternatively coNnected with the portion of the first hydraulic cylinder between the first piston and the second end wall with the outlet of the pump means or the sump means; second conduit means adapted to be selectively and alternatively connected with the portion of the second hydraulic cylinder between the second piston and the second end wall with the sump means or the outlet of the pump means; first bypass means extending from the first conduit means to the first hydraulic cylinder, with the point of connection between the first bypass means and the first hydraulic cylinder being spaced from the second end wall of the first hydraulic cylinder a distance greater than the thickness of the first piston so that during the portion of the stroke of the first piston when the first piston is closest to the second end wall of the first hydraulic cylinder, the first bypass means permits fluid communication between the first conduit means and the portion of the first hydraulic cylinder between the first piston and the first end wall of the first hydraulic cylinder; and a second bypass means extending from the second conduit means to the second hydraulic cylinder, with the point of connection between the second bypass means and the second hydraulic cylinder being spaced from the second end wall of the second hydraulic cylinder a distance greater than the thickness of the second piston so that during the portion of the stroke of the second piston when the second piston is closest to the second end wall of the second hydraulic cylinder, the second bypass means permits fluid communication between the second conduit means and the portion of the second hydraulic cylinder between the second piston and the first end wall of the second hydraulic cylinder.
Claim 2
Dependent Claim
490 words
An improved hydraulic system comprising; a first hydraulic cylinder having a sidewall and first and second closed end walls; a first piston positioned within the first hydraulic cylinder for reciprocal movement therein in a direction parallel to the central longitudinal axis of the first hydraulic cylinder; a first piston rod secured to one face of the first piston and extending from the first hydraulic cylinder through a sealed aperture in one of the end walls thereof; a second hydraulic cylinder having a sidewall and first and second closed end walls; a second piston positioned within the second hydraulic cylinder for reciprocal movement therein in a direction parallel to the central longitudinal axis of the second hydraulic cylinder; a second piston rod secured to one face of the second piston and extending from the second hydraulic cylinder through a sealed aperture in one of the end walls thereof; means for permitting fluid communication between the first hydraulic cylinder, adjacent to its first end wall, and the second hydraulic cylinder, adjacent to its first end wall; pump means for pumping hydraulic fluid; sump means for receiving hydraulic fluid; first conduit means adapted to be selectively and alternatively coNnected with the portion of the first hydraulic cylinder between the first piston and the second end wall with the outlet of the pump means or the sump means; second conduit means adapted to be selectively and alternatively connected with the portion of the second hydraulic cylinder between the second piston and the second end wall with the sump means or the outlet of the pump means; first bypass means extending from the first conduit means to the first hydraulic cylinder, with the point of connection between the first bypass means and the first hydraulic cylinder being spaced from the second end wall of the first hydraulic cylinder a distance greater than the thickness of the first piston so that during the portion of the stroke of the first piston when the first piston is closest to the second end wall of the first hydraulic cylinder, the first bypass means permits fluid communication between the first conduit means and the portion of the first hydraulic cylinder between the first piston and the first end wall of the first hydraulic cylinder; and a second bypass means extending from the second conduit means to the second hydraulic cylinder, with the point of connection between the second bypass means and the second hydraulic cylinder being spaced from the second end wall of the second hydraulic cylinder a distance greater than the thickness of the second piston so that during the portion of the stroke of the second piston when the second piston is closest to the second end wall of the second hydraulic cylinder, the second bypass means permits fluid communication between the second conduit means and the portion of the second hydraulic cylinder between the second piston and the first end wall of the second hydraulic cylinder.
Claim 3
Dependent Claim
26 words
The improved hydraulic system described in claim 1 wherein the means for permitting fluid communication between the first and second hydraulic cylinders includes third conduit means.
Claim 4
Dependent Claim
49 words
The improved hydraulic system described in claim 1 wherein the first piston rod extends through a sealed aperture in the first end wall of the first hydraulic cylinder; and wherein the second piston rod extends through a sealed aperture in the first end wall of the second hydraulic cylinder.
Claim 5
Dependent Claim
56 words
The improved hydraulic system described in claim 1 which includes valve means being selectively operable to connect the first conduit means with the outlet of the pump and the second conduit means with the sump or to connect the first conduit means with the sump and the second conduit means with the outlet of the pump.
Claim 6
Dependent Claim
67 words
The improved hydraulic system described in claim 1 wherein the means for permitting fluid communication between the first and second hydraulic cylinders includes third conduit means; wherein the first piston rod extends through a sealed aperture in the first end wall of the first hydraulic cylinder; and wherein the second piston rod extends through a sealed aperture in the first end wall of the second hydraulic cylinder.
Claim 7
Dependent Claim
56 words
The improved hydraulic system described in claim 5 which includes valve means being selectively operable to connect the first conduit means with the outlet of the pump and the second conduit means with the sump or to connect the first conduit means with the sump and the second conduit means wit the outlet of the pump.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |