Patent US4328670A successfully refreshed from Google Patents.
US4328670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic motion amplifier
Assignee: Reynolds Metals Co
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Filing: 1980-09-29
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Granted: 1982-05-11
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Expires: 2000-09-29
Abstract
Abstract A hydraulic system for motion amplification is disclosed. The system provides hydraulic fluid on both sides of a pair of hydraulic cylinders, creating a pressurized closed loop which provides precision control during both forward and reverse strokes of each hydraulic piston.
Inventors
- 👤 John R. McLean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:05
CPC Classifications
F; F15; F15B; F15B7/00; F15B7/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
224 words
A hydraulic motion amplification system comprising a first hydraulic cylinder having a piston and a piston rod, a second hydraulic cylinder having a piston and a piston rod, a motor driven cam and a cam follower contacting said cam, said cam follower being connected to said first piston rod for driving said first piston in a first direction, a first hydraulic line connecting the front end of said first hydraulic cylinder to the rear end of said second hydraulic cylinder, a second hydraulic line connecting the front end of said second hydraulic cylinder to the rear end of said first hydraulic cylinder, hydraulic fluid on both ends of both hydraulic cylinders, a flexible bladder hydraulically connected to said second hydraulic line, an air chamber surrounding said bladder and means for controlling air pressure within said air chamber for controlling hydraulic pressure between the front face of said second piston and the rear face of said first piston and for driving said first piston in a second direction, and a third hydraulic line connecting said first and said second hydraulic lines and an air cylinder for opening and closing said third hydraulic line for balancing hydraulic pressure on both ends of both hydraulic cylinders after each cycle of said system, said pistons having differing surface areas to produce a ratio of movement between said pistons.
Claim 2
Dependent Claim
224 words
A hydraulic motion amplification system comprising a first hydraulic cylinder having a piston and a piston rod, a second hydraulic cylinder having a piston and a piston rod, a motor driven cam and a cam follower contacting said cam, said cam follower being connected to said first piston rod for driving said first piston in a first direction, a first hydraulic line connecting the front end of said first hydraulic cylinder to the rear end of said second hydraulic cylinder, a second hydraulic line connecting the front end of said second hydraulic cylinder to the rear end of said first hydraulic cylinder, hydraulic fluid on both ends of both hydraulic cylinders, a flexible bladder hydraulically connected to said second hydraulic line, an air chamber surrounding said bladder and means for controlling air pressure within said air chamber for controlling hydraulic pressure between the front face of said second piston and the rear face of said first piston and for driving said first piston in a second direction, and a third hydraulic line connecting said first and said second hydraulic lines and an air cylinder for opening and closing said third hydraulic line for balancing hydraulic pressure on both ends of both hydraulic cylinders after each cycle of said system, said pistons having differing surface areas to produce a ratio of movement between said pistons.
Claim 3
Dependent Claim
55 words
The system of claim 1 wherein said means for controlling air pressure within said air chamber comprises a pressurized air supply line having a pressure regulator thereon, an air exhaust line having a pressure regulator thereon and a switchable valve means connecting said air supply line and said air exhaust line to said air chamber.
Claim 4
Dependent Claim
16 words
The system of claim 1 including means for adjusting the initial position of said second piston.
Claim 5
Dependent Claim
45 words
The system of claim 3 wherein said means for adjusting comprises at least one air cylinder hydraulically connected to said third hydraulic line to increase or decrease the volume between the front face of said first piston and the rear face of said second piston.
Claim 6
Dependent Claim
30 words
The system of claim 1 wherein said first piston has a larger surface area and shorter stroke and said second piston has a smaller surface area and a longer stroke.
Claim 7
Dependent Claim
20 words
The system of claim 5 further comprising means connected to and carried for linear movement by said second piston rod.
Claim 8
Dependent Claim
31 words
The system of claim 1 wherein said first piston has a smaller surface area and a longer stroke and said second piston has a larger surface area and a shorter stroke.
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) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |