Patent US3584536A successfully refreshed from Google Patents.
US3584536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple area hydraulic actuator
Assignee: Individual
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Filing: 1971-01-13
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Granted: 1971-06-15
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Expires: 1991-01-13
Abstract
Abstract Two or more fluid motors of the expandable chamber type are connected to a source of pressurized fluid, and are crossconnected to one another through valving, such that the power delivering element operates rapidly with a low force in one direction, (positive force), until a high resistance is encountered. Then a valve shifts automatically to increase the positive force output while the power delivering element operates at a lower speed. Further, upon reversal of the motors, highpressure and low-speed retraction occurs if a substantial positive load remains against the power delivering element. This results in nice slow precise control of the apparatus. However, if the positive load, upon retraction, falls to a low level, the valve again shifts, automatically, to cause rapid retraction, thereby automatically avoiding timewasting slow retraction. If a reverse (negative) load is encountered during the retraction stroke, then the valve automatically shifts between fast, lowforce and slow, high-force positions to achieve desirable results similar to those set out above in regard to positive forces.
Inventors
- 👤 Benny M Hillberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:13
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B11/022; F15B15/00; F15B15/20; F15B15/204; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/60; F15B2211/625; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/7055; F15B2211/71; F15B2211/7107; F15B2211/775
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
245 words
A multiple-area fluid actuator comprising a plurality of reversible expandable chamber motor devices operator to deliver positive and negative forces for moving an object, a forcedelivering element driven by said motor devices, fluid conduit means connected to a first of said motor devices to supply pressurized fluid to one side of said first motor during production of a positive force and to vent said side of said first motor during production of a negative force by said actuator, fluid conduit means connected to a second of said motor devices to supply pressurized fluid to one side of said second motor during production of a positive force and to end said side of said second motor during production of a negative force by said actuator, valve means blocking fluid passage in said second conduit means when said valve is in its normal neutral position and means to automatically open said valve means to said one side of said second motor and to vent said other side when said forcedelivering element encounters a predetermined resistance to its positive force-delivering movement to thereby automatically feed pressurized fluid to said second motor device to assist in delivering positive fore and to automatically open said valve mean to said other side of said second motor and to vent said one side when said force-delivering element encounters a predetermined resistance to its negative force-delivering movement to thereby automatically feed pressurized fluid to said second motor device assist in delivering negative force.
Claim 2
Dependent Claim
245 words
A multiple-area fluid actuator comprising a plurality of reversible expandable chamber motor devices operator to deliver positive and negative forces for moving an object, a forcedelivering element driven by said motor devices, fluid conduit means connected to a first of said motor devices to supply pressurized fluid to one side of said first motor during production of a positive force and to vent said side of said first motor during production of a negative force by said actuator, fluid conduit means connected to a second of said motor devices to supply pressurized fluid to one side of said second motor during production of a positive force and to end said side of said second motor during production of a negative force by said actuator, valve means blocking fluid passage in said second conduit means when said valve is in its normal neutral position and means to automatically open said valve means to said one side of said second motor and to vent said other side when said forcedelivering element encounters a predetermined resistance to its positive force-delivering movement to thereby automatically feed pressurized fluid to said second motor device to assist in delivering positive fore and to automatically open said valve mean to said other side of said second motor and to vent said one side when said force-delivering element encounters a predetermined resistance to its negative force-delivering movement to thereby automatically feed pressurized fluid to said second motor device assist in delivering negative force.
Claim 3
Dependent Claim
29 words
Apparatus as set forth in claim 1 wherein said motor devices comprises a substantially concentric cylinder piston assembly with said first motor device substantially surrounding said second motor device.
Claim 4
Dependent Claim
63 words
Apparatus as in claim 2 wherein said second moTor device comprises a piston-valve connected to said force-delivering element, and wherein said fluid conduit means comprises fluid conduits adjacent to opposing ends of said first motor device, and additional fluid conduits between said first and second motor devices comprising ports and passages from said first motor device to and through said second motor device.
Claim 5
Dependent Claim
103 words
Apparatus as in claim 3 wherein said additional fluid conduits comprise passages in said first motor device and ports in said second (piston-valve) motor device, said passages and ports being spaced to prevent alignment therebetween during normal high-speed-low-force movement while permitting fluid communication between opposing sides of said second motor device, and said ports, upon being shifted by said force-delivering element, being registrable with said passages to permit high-pressure fluid from said first motor device to act on one side of said second motor device and to vent the other side, while blocking fluid communication between opposing sides of said second motor device.
Claim 6
Dependent Claim
27 words
Apparatus as in claim 1 wherein said motor devices comprise a substantially concentric cylinder piston assembly with said second motor device substantially surrounding said first motor device.
Claim 7
Dependent Claim
62 words
Apparatus as in claim 5 wherein said first motor device comprises a piston-valve connected to said force-delivering element, and wherein said fluid conduit means comprises fluid conduits adjacent to opposing ends of said first motor device, and additional fluid conduits between said first and second motor devices comprising passages in said first motor device registrable with ports in said second motor device.
Claim 8
Dependent Claim
82 words
Apparatus as in claim 6 wherein said passages and ports are spaced to prevent fluid flow between said first and second motor devices when in the normal high-speed-low-force movement and to permit fluid communication between opposing sides of said second motor device, and wherein said passages and ports, upon being shifted by said force-delivering element, permit high-pressure fluid from said first motor device to act on said second motor device, while blocking fluid communication between opposing sides of said second motor device.
Claim 9
Dependent Claim
37 words
Apparatus as in claim 1 wherein said motor devices comprise substantially parallel side-by-side units with rigidly interconnected cylinders and rigidly interconnected piston rods, and wherein said fluid conduit means comprises a valve assembly mounted on the device.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |