US3837444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oleopneumatic shock absorbers
Assignee: Individual
•
Filing: 1973-11-13
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Granted: 1974-09-24
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Expires: 1993-11-13
Abstract
Abstract An oleopneumatic shock absorber comprising two coaxial tubes separated by an annular space which is divided by a transverse partition into two compartments each containing a chamber containing hydraulic fluid, each chamber being separated from a respective chamber containing gas by a sleeve of elastomeric material provided with an inner annular flange at its end adjacent to the partition, and with an outer annular flange at its end adjacent to one end of the shock absorber, wherein there is provided a device screwed onto the shock absorber so as to compress the outer flange of one of the sleeves against a fixed part of the shock absorber thus closing a passage which opens into the adjacent chamber containing gas and which communicates with a gap included between the co-operating threads of the shock absorber and of the device, and an annular unit which is supported on the device by a distance-piece so as to compress the inner flange of the one resilient sleeve against a further fixed part of the shock absorber in order to close another passage linking the two chambers containing gas via the transverse partition.
Inventors
- 👤 J Allinquant
- 👤 F Allinquant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:40
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/06; F16F9/08; F16F9/092; B; B60; B60G; B60G17/00; B60G17/02; B60G17/04; B60G17/044
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
231 words
An oleopneumatic shock absorber comprising inner and outer coaxial tubes separated by an annular space, the inner of the said tubes defining a cylinder, a movable piston in said cylinder, piston rod connected to said piston and extending through one end of said shock absorber, a transverse partition dividing said space into two compartments, a sleeve of elastomeric material separating each compartment into inner and outer chambers, one chamber containing hydraulic fluid and the other chamber containing gas, an inner annular flange provided on said sleeves at said sleeves'' end adjacent said partition and an outer annular flange provided on said sleeves at said sleeves'' end adjacent to one end of the shock absorber, a device screwed onto one end of said shock absorber so as to compress said outer flange of one of said sleeves against a fixed part of said shock absorber thus closing a first passage which opens into the chamber containing gas adjacent said device and which communicates with a gap included between the cooperating threads of the shock absorber and said device, an annular unit, and a distance-piece supporting said annular unit so as to compress said inner flange of the said one resilient sleeve against a further fixed part of the shock absorber spaced from said fixed part in order to close a second passage linking said two chambers containing gas through said transverse partition.
Claim 2
Dependent Claim
231 words
An oleopneumatic shock absorber comprising inner and outer coaxial tubes separated by an annular space, the inner of the said tubes defining a cylinder, a movable piston in said cylinder, piston rod connected to said piston and extending through one end of said shock absorber, a transverse partition dividing said space into two compartments, a sleeve of elastomeric material separating each compartment into inner and outer chambers, one chamber containing hydraulic fluid and the other chamber containing gas, an inner annular flange provided on said sleeves at said sleeves'' end adjacent said partition and an outer annular flange provided on said sleeves at said sleeves'' end adjacent to one end of the shock absorber, a device screwed onto one end of said shock absorber so as to compress said outer flange of one of said sleeves against a fixed part of said shock absorber thus closing a first passage which opens into the chamber containing gas adjacent said device and which communicates with a gap included between the cooperating threads of the shock absorber and said device, an annular unit, and a distance-piece supporting said annular unit so as to compress said inner flange of the said one resilient sleeve against a further fixed part of the shock absorber spaced from said fixed part in order to close a second passage linking said two chambers containing gas through said transverse partition.
Claim 3
Dependent Claim
30 words
A shock absorber as claimed in claim 1, in which said device is positioned on the end of the shock absorber which surrounds the piston rod of said shock absorber.
Claim 4
Dependent Claim
24 words
A shock absorber as claimed in claim 2, in which an oleopneumatic spring arrangement is provided within said annular compartment adjacent to said device.
Claim 5
Dependent Claim
72 words
A shock absorber as claimed in claim 3, in which a breech-piece closes off the end of the shock absorber positioned on the end opposite to the piston rod, suction and delivery valves of a pumping-action device operated by the movement of the piston of the shock absorber being accommodated in said breech-piece so as to pump liquid between the compartment adjacent to the breech-piece and the cylinder of the shock absorber.
Claim 6
Dependent Claim
18 words
A shock absorber as claimed in claim 4, in which a safety valve is provided in said breech-piece.
Claim 7
Dependent Claim
58 words
A shock absorber as claimed in claim 5, in which a nozzle is provided in the breech-piece, said nozzle making it possible to adjust a flow of hydraulic fluid between the cylinder and the compartment adjacent to the breech-piece, and in which a filter is positioned upstream of the nozzle in the normal direction of the said flow.
Claim 8
Dependent Claim
29 words
A shock absorber as claimed in claim 6, in which a filter is positioned in the breech-piece downstream of the nozzle in the normal direction of the said flow.
Claim 9
Dependent Claim
37 words
A shock absorber as claimed in claim 1, in which said chambers containing gas are positioned on the outer side of said compartment adjacent said device and on the inner side of said compartment adjacent said breech-piece.
Claim 10
Dependent Claim
46 words
A shock absorber as claimed in claim 1, in which an intermediate tube is provided which encloses the inner tube and defines a third passage between the intermediate and inner tubes, the said intermediate tube being divided into two lengths one of which constitutes said distance-piece.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |