US3572679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydro-pneumatic oleo strut or suspension assemblage provided with level regulating means located within the cylinder housing
Assignee: Langen and Co
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Filing: 1968-11-20
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Granted: 1971-03-30
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Expires: 1988-11-20
Abstract
Abstract A hydropneumatic oleo strut or suspension assemblage adapted to be arranged between a wheel supporting means and a vehicle body in which the cylinder casing has located therein a level regulating means. The level regulating means is defined by a multiple way valve and which valve, dependent upon the relative position of the piston rod and cylinder, establishes in a first regulating position a fluid path between a pressure line or conduit which leads to the piston space and in a second regulating position a fluid path in a line leading between the piston space and a drain line or conduit. In a third regulating position, namely, a neutral position, the multiple way valve blocks the aforesaid fluid paths and a continuously operative spring means serves to move the control piston of the multiple way valve into a position which corresponds to the first regulating position, whereas an extension spring means operative only within a certain stroke range related to the piston or piston rod serves to move the control piston into the second regulating position in opposition to the force of the spring means.
Inventors
- 👤 Gunter Strauff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:22
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/02; B60G17/04; B60G17/048
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
331 words
A hydropneumatic oleo strut and the like adapted to be arranged between a wheel supporting means and a vehicle body, comprising a cylinder, a head for the cylinder, a piston slidable in the cylinder and a level regulating means located within said head, said level regulating means comprising a control piston slidable in a bore provided in said cylinder head, said cylinder head having passages leading to a pressure line and drain line respectively with said passages communicating with said bore, said control piston having opposite ends with the end remote from the cylinder extending into an enlarged space of said bore in said cylinder head, the opposite end of said control piston extending into a piston space defined in said cylinder between the head of the piston and said cylinder head, said control piston having means constituting a flow path therein between said pressure passage and the end of the control piston remote from the piston space, said end of the control piston extending into said piston space having means together with said cylinder head constituting a hermetic seal opening in the direction of the piston space, said control piston having a flow path therein providing communication between said pressure passage and said piston space, said level regulating means dependent upon the relative position of the piston rod and cylinder establishing in a first position a flow connection between the pressure passage and said piston space, in a second position a flow connection between said piston space and said drain passage and a neutral position blocking said flow connections, a continuously operative spring means related to said control piston serving to move said control piston into a position corresponding to said first control position and an extension spring connected to the end of the control piston extending into said piston space and to said piston operative only within a certain stroke range for moving said control piston into said second regulating position against the force of said continuously operative spring.
Claim 2
Dependent Claim
331 words
A hydropneumatic oleo strut and the like adapted to be arranged between a wheel supporting means and a vehicle body, comprising a cylinder, a head for the cylinder, a piston slidable in the cylinder and a level regulating means located within said head, said level regulating means comprising a control piston slidable in a bore provided in said cylinder head, said cylinder head having passages leading to a pressure line and drain line respectively with said passages communicating with said bore, said control piston having opposite ends with the end remote from the cylinder extending into an enlarged space of said bore in said cylinder head, the opposite end of said control piston extending into a piston space defined in said cylinder between the head of the piston and said cylinder head, said control piston having means constituting a flow path therein between said pressure passage and the end of the control piston remote from the piston space, said end of the control piston extending into said piston space having means together with said cylinder head constituting a hermetic seal opening in the direction of the piston space, said control piston having a flow path therein providing communication between said pressure passage and said piston space, said level regulating means dependent upon the relative position of the piston rod and cylinder establishing in a first position a flow connection between the pressure passage and said piston space, in a second position a flow connection between said piston space and said drain passage and a neutral position blocking said flow connections, a continuously operative spring means related to said control piston serving to move said control piston into a position corresponding to said first control position and an extension spring connected to the end of the control piston extending into said piston space and to said piston operative only within a certain stroke range for moving said control piston into said second regulating position against the force of said continuously operative spring.
Claim 3
Dependent Claim
125 words
The hydropneumatic oleo strut and the like as claimed in claim 1 in which said flow path between said pressure passage and said piston space includes an annular groove in the control piston adjacent said sealing surface, a transverse bore connecting said annular groove with an axial bore in the control piston with the end of the control piston remote from said piston space, and said control piston having at least one additional annular groove spaced from said mentioned annular groove which additional annular groove dependent upon the position of the control piston is connected either with the pressure passage, the drain passage or separated from both such passages and transverse bores connecting said additional annular groove with the axial bore of the control piston.
References Cited (Backward Citations)
US3140084A
Cited
US3208760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |