US3724832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oleo-pneumatic shock absorber
Assignee: MENASCO Manufacturing LTD CA
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Filing: 1971-03-09
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Granted: 1973-04-03
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Expires: 1991-03-09
Abstract
Abstract A two-stage oleo-pneumatic shock absorber incorporating two pneumatic (air) pressure chambers, a high air pressure chamber and a low pressure (air) chamber, separated by a hydraulic fluid (oil) pressure chamber. The oil chamber contains an orifice and metering pin, which orifice and metering pin control the rate of collapse of the low pressure air chamber. It also contains a second orifice and metering pin which control the rate of collapse of the high pressure air chamber. Both metering pins are preprogrammed so as to interact with each other and effect a nearly constant load throughout the stroke of the shock absorber, even under transient loading conditions.
Inventors
- 👤 F Ceska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:52
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/06; F16F9/32; F16F9/34; F16F9/342
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
231 words
A shock absorber comprising a cylinder having a hydraulic chamber separated into sections by a movable piston; first orifice means comprising a first stage preprogrammed metering valve and a first orifice, one of which is movable with said piston and the other being fixed to said cylinder; a compressible high pressure chamber operatively connected to said hydraulic chamber through a second piston and capable of being changed dimensionally in response to movement of said second piston; said second piston being in communication with said hydraulic chamber on one side thereof; means for effecting relative movement between said first stage valve and said first orifice in response to application of a load to said piston, the improvement which comprises; second orifice means comprising a second orifice in said chamber and a second stage preprogrammed metering valve, one of which is fixed to said cylinder and the other being movable with said second piston, said second piston being movable in response to the pressure between said second orifice and said second piston for controlling the rate of compression of said high pressure chamber whereby an increase in pressure in the hydraulic chamber caused by a high pressure transient load is instantaneously and simultaneously damped by the interaction of the flow of the hydraulic fluid through the two orifices and about the two metering valves and the resulting compression of the high pressure chamber.
Claim 2
Dependent Claim
231 words
A shock absorber comprising a cylinder having a hydraulic chamber separated into sections by a movable piston; first orifice means comprising a first stage preprogrammed metering valve and a first orifice, one of which is movable with said piston and the other being fixed to said cylinder; a compressible high pressure chamber operatively connected to said hydraulic chamber through a second piston and capable of being changed dimensionally in response to movement of said second piston; said second piston being in communication with said hydraulic chamber on one side thereof; means for effecting relative movement between said first stage valve and said first orifice in response to application of a load to said piston, the improvement which comprises; second orifice means comprising a second orifice in said chamber and a second stage preprogrammed metering valve, one of which is fixed to said cylinder and the other being movable with said second piston, said second piston being movable in response to the pressure between said second orifice and said second piston for controlling the rate of compression of said high pressure chamber whereby an increase in pressure in the hydraulic chamber caused by a high pressure transient load is instantaneously and simultaneously damped by the interaction of the flow of the hydraulic fluid through the two orifices and about the two metering valves and the resulting compression of the high pressure chamber.
Claim 3
Dependent Claim
83 words
In a shock absorber as defined in claim 1 having a low pressure compressible chamber operatively connected to said hydraulic chamber on the other side thereof from said high pressure chamber and capable of being changed dimensionally in response to movement of said first piston, said low pressure chamber being divided from said hydraulic chamber by a third piston whereby an increase in pressure in the hydraulic chamber caused by a hydraulic pressure transient load results in compression of the low pressure chamber.
Claim 4
Dependent Claim
36 words
A shock absorber means as defined in claim 1 wherein said second orifice means comprises a second orifice in a plate fixed to said cylinder, said second stage metering valve being attached to said second piston.
Claim 5
Dependent Claim
21 words
A shock absorber as defined in claim 2 wherein said high pressure and said low pressure chambers comprise air spring means.
Claim 6
Dependent Claim
60 words
The shock absorber as defined in claim 1 in which said second stage preprogrammed metering valve is programmed such that it opens fully to dump hydraulic fluid from said hydraulic chamber prior to full compression of said shock absorber such that the load transmitted through said shock absorber decreases during the last portion of the stroke of the shock absorber.
Claim 7
Dependent Claim
206 words
A shock absorber comprising a cylinder having a hydraulic chamber separated into sections by a movable piston Orifice plate; a first stage preprogrammed metering pin fixed within the hydraulic chamber and passing through the orifice in said plate; a high pressure chamber on one side of said hydraulic chamber being sealingly separated from said hydraulic chamber by a first piston slideably mounted in said cylinder and located at one end of said hydraulic chamber; means for effecting movement of said plate relative to said first stage metering pin in response to application of a load to said plate, the improvement which comprises; a second orifice plate fixed in said hydraulic chamber and a second stage preprogrammed metering pin secured to said first piston and passing through the orifice in said second plate, said second stage metering pin being movable relative to said orifice of said second orifice plate in response to a pressure change in said chamber for controlling the rate of compression of said high pressure chamber whereby an increase in pressure in the hydraulic chamber caused by a high pressure transient load is instantaneously damped by the interaction of the flow of hydraulic fluid through the two orifices and about the two metering pins.
Claim 8
Dependent Claim
206 words
A shock absorber comprising a cylinder having a hydraulic chamber separated into sections by a movable piston Orifice plate; a first stage preprogrammed metering pin fixed within the hydraulic chamber and passing through the orifice in said plate; a high pressure chamber on one side of said hydraulic chamber being sealingly separated from said hydraulic chamber by a first piston slideably mounted in said cylinder and located at one end of said hydraulic chamber; means for effecting movement of said plate relative to said first stage metering pin in response to application of a load to said plate, the improvement which comprises; a second orifice plate fixed in said hydraulic chamber and a second stage preprogrammed metering pin secured to said first piston and passing through the orifice in said second plate, said second stage metering pin being movable relative to said orifice of said second orifice plate in response to a pressure change in said chamber for controlling the rate of compression of said high pressure chamber whereby an increase in pressure in the hydraulic chamber caused by a high pressure transient load is instantaneously damped by the interaction of the flow of hydraulic fluid through the two orifices and about the two metering pins.
Claim 9
Dependent Claim
64 words
A shock absorber defined in claim 6 having a low pressure chamber on the opposite end of said hydraulic chamber from said high pressure chamber, said lower pressure chamber being sealingly separated from said hydraulic chamber by a second piston slideably mounted in said cylinder so that a change in pressure in said chamber is damped by the compression of said low pressure chamber.
Claim 10
Dependent Claim
60 words
The shock absorber as defined in claim 6 in which said second stage preprogrammed metering pin is programmed such that it opens fully to dump hydraulic fluid from said hydraulic chamber prior to full compression of said shock absorber such that the load transmitted through said shock absorber decreases during the last portion of the stroke of the shock absorber.
Claim 11
Dependent Claim
31 words
The shock absorber as defined in claim 6 wherein said first metering pin is generally hollow and said second metering pin extends into the hollow interior of said first metering pin.
Claim 12
Dependent Claim
23 words
The shock absorber as defined in claim 7 in which both said high pressure and said low pressure chambers comprise air spring means.
Claim 13
Dependent Claim
20 words
The shock absorber as defined in claim 6 wherein both said first and second metering pins have noncylindrical external contours.
Claim 14
Dependent Claim
27 words
The shock absorber as defined in claim 9 wherein said first metering pin contains flow openings connecting the hollow interior of said pin to said hydraulic chamber.
References Cited (Backward Citations)
US3265381A
Cited
US3533613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |