US4463838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration jacks
Assignee: PAUL JACOTTET ETS
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Filing: 1982-08-16
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Granted: 1984-08-07
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Expires: 2002-08-16
Abstract
Abstract An improved vibration jack is presented wherein the excess energy which might develop from overpressurizations and cause loss of control, is absorbed. This excess energy is transmitted to fluid within a chamber by means of an extension of the jack piston rod. Maintaining the fluid in the chamber at a constant pressure, and allowing discharge of fluid when this pressure is exceeded allows the fluid to absorb any excess energy.
Inventors
- 👤 Jean-Louis Jacottet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:38
CPC Classifications
F; F03; F03C; F03C1/00; F03C1/007; B; B06; B06B; B06B1/00; B06B1/18; B06B1/183
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
196 words
In a vibration jack, the vibration jack including a piston with two ends, the piston having a piston rod extending from at least one of said ends, the piston and piston rod reciprocating within a cylinder, the reciprocating action being controlled by a servo-valve distributor, the improvement comprising a device for absorbing energy generated when the vibration jack is operating at a frequency which is proximate to its characteristic frequency, said improvement including: means defining a fluid chamber, the piston rod extending axially into said chamber, the piston rod having a cross-sectional area smaller than that of said fluid chamber; means defining a pair of fluid flow passages which communicate with one of said passages being a fluid supply duct and the other of said passages being a fluid discharge duct; throttle means disposed in said fluid discharge duct, fluid being discharged from said chamber only through said throttle means and only when the piston rod is moved in a first direction; and means disposed in said fluid supply duct for delivering fluid to said chamber via the supply duct and only when the piston rod moves in a second direction opposite to the first direction.
Claim 2
Dependent Claim
196 words
In a vibration jack, the vibration jack including a piston with two ends, the piston having a piston rod extending from at least one of said ends, the piston and piston rod reciprocating within a cylinder, the reciprocating action being controlled by a servo-valve distributor, the improvement comprising a device for absorbing energy generated when the vibration jack is operating at a frequency which is proximate to its characteristic frequency, said improvement including: means defining a fluid chamber, the piston rod extending axially into said chamber, the piston rod having a cross-sectional area smaller than that of said fluid chamber; means defining a pair of fluid flow passages which communicate with one of said passages being a fluid supply duct and the other of said passages being a fluid discharge duct; throttle means disposed in said fluid discharge duct, fluid being discharged from said chamber only through said throttle means and only when the piston rod is moved in a first direction; and means disposed in said fluid supply duct for delivering fluid to said chamber via the supply duct and only when the piston rod moves in a second direction opposite to the first direction.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein said chamber defining means is integral with the vibration jack.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 wherein said delivering means comprises a check valve.
Claim 5
Dependent Claim
11 words
The apparatus of claim 1 wherein said throttle means is adjustable.
Claim 6
Dependent Claim
49 words
The apparatus of claim 1 wherein piston rods extend coaxially from both ends of the piston, a first piston rod being coupled to a load and the second piston rod extending into said chamber and terminating therein and wherein said chamber defining means is integral with the vibration jack.
Claim 7
Dependent Claim
13 words
The apparatus of claim 5 wherein said delivering means comprises a check valve.
Claim 8
Dependent Claim
11 words
The apparatus of claim 6 wherein said throttle means is adjustable.
References Cited (Backward Citations)
US3176801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |