Patent US4031989A successfully refreshed from Google Patents.
US4031989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double effect hydraulic shock absorber
Assignee: AlliedSignal Automotive Espana SA
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Filing: 1976-02-03
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Granted: 1977-06-28
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Expires: 1996-02-03
Abstract
Abstract A double effect hydraulic shock absorber includes a system for varying the resistance of the compression cycle of the shock absorber. Two different compression loads are obtained by joining the inner chamber of the shock absorber to the outer annular chamber through two groups of exhaust ducts, each of the groups of exhaust ducts being controlled by unidirectional valves set at different pressures or strengths. The ducts set at a lesser pressure are provided with a blocking device capable of closing such ducts, thus leaving as the only outlet for the expelled oil the ducts set at a higher pressure. The blocking device includes an electromagnet which axially activates the blocking element, thus closing or leaving free the inlet of the weak exhaust ducts.
Inventors
- 👤 Antonio Giner Blazquez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:38
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/44; F16F9/46; B; B60; B60G; B60G17/00; B60G17/015; B60G17/0152; B60G17/06; B60G17/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
336 words
A double effect shock absorber comprising: an inner tube defining an inner chamber having fluid therein; an outer tube concentric with said inner tube and defining therewith an annular outer chamber; a piston attached to a rod which extends through one end of said inner tube and movable within said inner chamber; a body assembly attached to the other end of said inner tube and thereby closing said inner chamber at said other end of said inner tube; said body assembly including a first body member having therein an annular chamber; an electromagnet positioned within said annular chamber of said first body member; said body assembly including a second body member attached to said first body member and defining therewith a collection chamber in permanent communication with said inner chamber; first and second exhaust duct means extending through said second body member and connecting said outer annular chamber with said collection chamber; first closure valve means for closing said first exhaust duct means; second closure valve means for closing said second exhaust duct means, said second closure valve means having a stronger resistance to opening than said first closure valve means; and blocking means positioned within said collection chamber, for blocking said first exhaust duct means when said electromagnet is deactivated, and for opening said first exhaust duct means when said electromagnet is activated; whereby, when said electromagnet is activated, movement of said piston within said inner chamber toward said body assembly will cause said fluid to pass through said first exhaust duct means and open said first closure valve means to pass to said outer annular chamber, while said second closure valve means closes said second exhaust duct means; whereby, when said electromagnet is deactivated, movement of said piston within said inner chamber toward said body assembly will cause said fluid to pass through said second exhaust duct means and open said second closure valve means to pass to said outer annular chamber, while said first exhaust duct means remain closed by said blocking means.
Claim 2
Dependent Claim
336 words
A double effect shock absorber comprising: an inner tube defining an inner chamber having fluid therein; an outer tube concentric with said inner tube and defining therewith an annular outer chamber; a piston attached to a rod which extends through one end of said inner tube and movable within said inner chamber; a body assembly attached to the other end of said inner tube and thereby closing said inner chamber at said other end of said inner tube; said body assembly including a first body member having therein an annular chamber; an electromagnet positioned within said annular chamber of said first body member; said body assembly including a second body member attached to said first body member and defining therewith a collection chamber in permanent communication with said inner chamber; first and second exhaust duct means extending through said second body member and connecting said outer annular chamber with said collection chamber; first closure valve means for closing said first exhaust duct means; second closure valve means for closing said second exhaust duct means, said second closure valve means having a stronger resistance to opening than said first closure valve means; and blocking means positioned within said collection chamber, for blocking said first exhaust duct means when said electromagnet is deactivated, and for opening said first exhaust duct means when said electromagnet is activated; whereby, when said electromagnet is activated, movement of said piston within said inner chamber toward said body assembly will cause said fluid to pass through said first exhaust duct means and open said first closure valve means to pass to said outer annular chamber, while said second closure valve means closes said second exhaust duct means; whereby, when said electromagnet is deactivated, movement of said piston within said inner chamber toward said body assembly will cause said fluid to pass through said second exhaust duct means and open said second closure valve means to pass to said outer annular chamber, while said first exhaust duct means remain closed by said blocking means.
Claim 3
Dependent Claim
22 words
A shock absorber as claimed in claim 1, wherein said blocking means comprises a circular-shaped plate element having a central aperture therethrough.
Claim 4
Dependent Claim
86 words
A shock absorber as claimed in claim 1, wherein said body assembly further comprises a third body member attached to said first body member and to said inner tube, said third body member having extending therethrough return duct means for returning fluid from said outer annular chamber to said inner chamber upon movement of said piston within said inner tube in a direction away from said body assembly, and closure means for closing said return duct means upon movement of said piston toward said body assembly.
Claim 5
Dependent Claim
121 words
A shock absorber as claimed in claim 1, comprising a first deflectable closure element attached to said second body member and covering both said first and second exhaust duct means, and a second deflectable closure element attached to said second body member and covering only a portion of said first deflectable closure element covering said second exhaust duct means, said first closure valve means comprising that portion of said first deflectable closure element which covers said first exhaust duct means and which is not covered by said second deflectable closure element, and said second closure valve means comprising said second deflectable closure element and that portion of said first deflectable closure element which is covered by said second deflectable closure element.
References Cited (Backward Citations)
US725456A
Cited
US2504435A
Cited
US2948357A
Cited
US3040841A
Cited
US3532194A
Cited
GB1363303A
Cited
US3874487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |