US3751023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspension devices
Assignee: Individual
•
Filing: 1971-10-07
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Granted: 1973-08-07
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Expires: 1991-10-07
Abstract
Abstract A suspension device comprises a pair of telescopically engaged members which define at least a pair of chambers which are reduced in volume as the members are moved inwardly relative to each other. One of the chambers is filled with a gas under pressure and the other chamber is filled with a liquid. Moreover, a valve assembly is provided which when the rate of closure of the members exceeds a predetermined value closes to increase the resistance to the closing movement of the members.
Inventors
- 👤 J Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:35
CPC Classifications
B; B64; B64C; B64C25/00; B64C25/32; B64C25/58; B64C25/60; F; F16; F16F; F16F9/00; F16F9/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
A suspension device comprising a pair of telescopically engaged members defining a pair of chambers one of which is filled with liquid and the other of which is filled with a gas, the total volume of the chambers being reduced as the members are closed relative to each other, the reduction in total volume being obtained as a result of the compression of the fluids and a normally open valve for controlling the flow of liquid which occurs due to compression of said gas, said valve being operable when the rate of closure of the members exceeds a first predetermined value, to increase the resistance to the flow of liquid and thereby the closing movement of the members.
Claim 2
Dependent Claim
118 words
A suspension device comprising a pair of telescopically engaged members defining a pair of chambers one of which is filled with liquid and the other of which is filled with a gas, the total volume of the chambers being reduced as the members are closed relative to each other, the reduction in total volume being obtained as a result of the compression of the fluids and a normally open valve for controlling the flow of liquid which occurs due to compression of said gas, said valve being operable when the rate of closure of the members exceeds a first predetermined value, to increase the resistance to the flow of liquid and thereby the closing movement of the members.
Claim 3
Dependent Claim
56 words
A device as claimed in claim 1 including a further chamber filled with gas, one of said gas filled chambers being substantially isolated by operation of said valve in the event that the rate of closure of the members exceeds said first predetermined value, thereby to increase the resistance to the closing movement of the members.
Claim 4
Dependent Claim
33 words
A device as claimed in claim 2 in which said valve when the rate of flow into said one chamber is below said first predetermined value allowing unrestricted flow to said one chamber.
Claim 5
Dependent Claim
38 words
A device as claimed in claim 3 in which said valve when the rate of flow out of said one chamber exceeds a second predetermined value, operates to limit the rate of flow out of said one chamber.
Claim 6
Dependent Claim
41 words
A device as claimed in claim 4 including a further valve associated with the other gas filled chamber, said further valve operating when the rate of flow out of said other chamber exceeds a third predetermined value, to restrict said flow.
Claim 7
Dependent Claim
54 words
A device as claimed in claim 5 including a third gas filled chamber associated with said one chamber, said third chamber containing gas at a lower pressure than the gas in said one chamber, said third chamber collapsing during closing movement of the members to cause said valve to substantially isolate said one chamber.
Claim 8
Dependent Claim
27 words
A device as claimed in claim 2 in which said one and the other gas filled chambers are defined by free pistons slidable in the members respectively.
Claim 9
Dependent Claim
105 words
A device as claimed in claim 4 in which said valve comprises a valve element disposed between a pair of spaced seating members, said valve element being loaded by a pair of springs to a position intermediate said seating members, said springs operating to resist movement of the element onto the seating members respectively, said seating members each having a restricted orifice formed therein to permit restricted contraction or expansion of said one gas filled chamber. 9 A device as claimed in claim 1 including a differential valve arranged when said valve has operated to restrict the rate of flow into said gas filled chamber.
Claim 10
Dependent Claim
33 words
A device as claimed in claim 9 in which said valves when the rate of closure of the members is below said predetermined value allow substantially unrestricted flow into said gas filled chamber.
Claim 11
Dependent Claim
43 words
A device as in claim 10 in which said valve in the event that the rate at which the members open exceeds a second predEtermined value operates so as to cause restriction of the rate of flow out of said gas filled chamber.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |