US3788433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic suspension unit
Assignee: Tokico Ltd
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Filing: 1972-06-28
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Granted: 1974-01-29
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Expires: 1992-06-28
Abstract
Abstract A suspension unit having a hollow cylinder and a hollow rod telescopically received therein is provided with fluid damping means in the end of the rod within the cylinder to control the flow of fluid between the cylinder and the rod. The cylinder and the end of the rod within the cylinder are filled with hydraulic fluid pressurized by a gas in the other end of the rod. The gas and hydraulic fluid may be in contact but to prevent formation of gas bubbles in the fluid a movable separator may be provided in the rod.
Inventors
- 👤 T Katsumori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:55
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/06; B; B60; B60G; B60G15/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
337 words
A combined hydraulic and mechanical suspension unit comprising, a hydraulic cylinder, a hollow rod telescopically movable within said cylinder, the outer surface of said hollow rod being in spaced relation to the inner surface of said cylinder, said hydraulic cylinder being closed at one end, sealing means located at the opposite end of said hollow cylinder between said cylinder and the outer surface of said hollow rod to define a fluid-tight chamber within said cylinder and said rod, said sealing means forming a first rod guide for said hollow rod, a second rod guide positioned between said hydraulic cylinder and said hollow rod between the ends of said hydraulic cylinder, said second rod guide being fixedly attached to the inside wall surface of said cylinder and slideably engaging the exterior surface of said hollow rod, said second rod guide having a plurality of openings therethrough for establishing fluid communication with the spaces formed within said cylinder on each side of said second rod guide, damping means attached to the end of said hollow rod within said cylinder to allow controlled fluid flow between the interior of said cylinder and the interior of said rod, said damping means including a closure plate having two passages extending therethrough and spring biased valve means in each passage operating in reverse flow relation to each other, separator means contained within the interior of said hollow rod for dividing the interior into two chambers, one of said chambers communicating with the interior of said cylinder through said damping means, the end of said hollow rod extending outwardly of the cylinder having a valve assembly located therein, said valve assembly communicating with the second of said chambers in said hollow rod, said valve assembly adapted for connection to an external gas pressure source for selectively supplying and removing pressurized gas from the second of said chambers in said hollow rod, whereby, the second chamber may be pressurized with gas to a predetermined pressure value for controlling the damping action of said suspension unit.
Claim 2
Dependent Claim
337 words
A combined hydraulic and mechanical suspension unit comprising, a hydraulic cylinder, a hollow rod telescopically movable within said cylinder, the outer surface of said hollow rod being in spaced relation to the inner surface of said cylinder, said hydraulic cylinder being closed at one end, sealing means located at the opposite end of said hollow cylinder between said cylinder and the outer surface of said hollow rod to define a fluid-tight chamber within said cylinder and said rod, said sealing means forming a first rod guide for said hollow rod, a second rod guide positioned between said hydraulic cylinder and said hollow rod between the ends of said hydraulic cylinder, said second rod guide being fixedly attached to the inside wall surface of said cylinder and slideably engaging the exterior surface of said hollow rod, said second rod guide having a plurality of openings therethrough for establishing fluid communication with the spaces formed within said cylinder on each side of said second rod guide, damping means attached to the end of said hollow rod within said cylinder to allow controlled fluid flow between the interior of said cylinder and the interior of said rod, said damping means including a closure plate having two passages extending therethrough and spring biased valve means in each passage operating in reverse flow relation to each other, separator means contained within the interior of said hollow rod for dividing the interior into two chambers, one of said chambers communicating with the interior of said cylinder through said damping means, the end of said hollow rod extending outwardly of the cylinder having a valve assembly located therein, said valve assembly communicating with the second of said chambers in said hollow rod, said valve assembly adapted for connection to an external gas pressure source for selectively supplying and removing pressurized gas from the second of said chambers in said hollow rod, whereby, the second chamber may be pressurized with gas to a predetermined pressure value for controlling the damping action of said suspension unit.
Claim 3
Dependent Claim
42 words
A suspension unit as set forth in claim 1, wherein said separator means comprises a piston slideably contained within the interior of said hollow rod in sealing engagement with the interior surface thereof for defining said two chambers within said hollow rod.
Claim 4
Dependent Claim
64 words
A suspension unit as set forth in claim 1, wherein said separator means comprises bellows means secured to said damping means and extending upwardly into the hollow interior of said rod to form said two chambers therein, wherein hydraulic fluid passing through said damping means enters said bellows means is maintained out of contact with a gas in the second chamber in said rod.
Claim 5
Dependent Claim
222 words
A combined hydraulic and mechanical suspension unit comprising, a hydraulic cylinder, a hollow rod telescopically movable within said cylinder, the outer surface of said hollow rod being in spaced relation to the inner surface of said cylinder, said hydraulic cylinder being closed at one end, sealing means located at the opposite end of said hollow cylinder between said cylinder and the outer surface of said hollow rod to define a fluid-tight chamber within said cylinder and said rod, said sealing means forming a first rod guide for said hollow rod, a second rod guid positioned between said hydraulic cylinder and said hollow rod between the ends of said hydrauLic cylinder, said second rod guide being fixedly attached to the inside wall surface of said cylinder and slideably engaging the exterior surface of said hollow rod, said second rod guide having a plurality of openings therethrough for establishing fluid communication with the spaces formed within said cylinder on each side of said second rod guide, damping means attached to the end of said hollow rod within said cylinder to allow controlled fluid flow between the interior of said cylinder and the interior of said rod, said damping means includes a closure plate having two passages extending therethrough and spring biased valve means in each passage operating in reverse flow relation to each other.
Claim 6
Dependent Claim
222 words
A combined hydraulic and mechanical suspension unit comprising, a hydraulic cylinder, a hollow rod telescopically movable within said cylinder, the outer surface of said hollow rod being in spaced relation to the inner surface of said cylinder, said hydraulic cylinder being closed at one end, sealing means located at the opposite end of said hollow cylinder between said cylinder and the outer surface of said hollow rod to define a fluid-tight chamber within said cylinder and said rod, said sealing means forming a first rod guide for said hollow rod, a second rod guid positioned between said hydraulic cylinder and said hollow rod between the ends of said hydrauLic cylinder, said second rod guide being fixedly attached to the inside wall surface of said cylinder and slideably engaging the exterior surface of said hollow rod, said second rod guide having a plurality of openings therethrough for establishing fluid communication with the spaces formed within said cylinder on each side of said second rod guide, damping means attached to the end of said hollow rod within said cylinder to allow controlled fluid flow between the interior of said cylinder and the interior of said rod, said damping means includes a closure plate having two passages extending therethrough and spring biased valve means in each passage operating in reverse flow relation to each other.
Claim 7
Dependent Claim
45 words
A combined hydraulic and mechanical suspension unit according to claim 4 further comprising separator means contained within the interior of said hollow rod for dividing the interior into two chambers, one of said chambers communicating with the interior of said cylinder through said damping means.
Claim 8
Dependent Claim
42 words
A suspension unit as set forth in claim 5, wherein said separator means comprises a piston slideably contained within the interior of said hollow rod in sealing engagement with the interior surface thereof for defining said two chambers within said hollow rod.
Claim 9
Dependent Claim
65 words
A suspension unit as set forth in claim 5, wherein said separator means comprises bellows means secured to said damping means and extending upwardly into the hollow interior of said rod to form said two chambers therein, wherein hydraulic fluid passing through said damping means enters said bellows means and is maintained out of contact with a gas in the second chamber in said rod.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |