Patent US1682216A successfully refreshed from Google Patents.
Patent US3899057A successfully refreshed from Google Patents.
US3899057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control circuit
Assignee: DBA SA
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Filing: 1974-02-22
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Granted: 1975-08-12
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Expires: 1994-02-22
Abstract
Abstract A cycle hydraulic braking system is disclosed, with a generating cylinder 10 and a receiving cylinder 14, the chamber 36 and chamber 48 for generating and receiving cylinder to communicate and define a fluid-tight enclosure filled with a predetermined volume of incompressible fluid the compensating piston 76 is coaxially mounted on generating piston 34, the compensating piston 76 is engaged by piston 34 when its forwards stroke is longer than the predetermined value D. A friction ring 78 maintains the compensating piston during the return stroke of piston 34 into its rest position in abutment with washer 72.
Inventors
- 👤 Jean-Jacques Carre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:24
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B62; B62L; B62L3/00; B62L3/02; B62L3/023; F; F15; F15B; F15B7/00; F15B7/06; F15B7/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
296 words
A hydraulic control circuit comprising at least one pressure generating assembly of the piston and cylinder type whose pressure chamber is connected to the pressure chamber of at least one pressure receiving assembly of the piston and cylinder type to define a sealed compartment; at least one compensating assembly of the piston and cylinder type whose compensating chamber is connected to the sealed compartment to define a fluidtight enclosure filled with a predetermined quantity of incompressible fluid, said compensating assembly comprising a compensating piston capable of being displaced towards the interior of the compensating chamber to reduce the volume thereof when the forward stroke of one of the pistons in the generating and receiving assemblies exceeds a predetermined value, the compensating piston cooperating by way of anti-return means with the cylinder of the compensating assembly so as to remain stationary relative to the latter cylinder during the return stroke of the said one of the pistons in the generating and receiving assemblies, said compensating assembly being situated in one of the generating or receiving assemblies, the compensating piston being coaxial with said one of the pistons in the generating and receiving assemblies and cooperating with the latter by way of a one-way thrust coupling with lost motion, said generating assembly comprising a casing, an assembly of concentric pistons mounted in the bore of said casing in a fluidtight manner, said assembly of concentric pistons comprising an annular compensating piston defining a central orifice slidably mounting an actuator piston connected to an intake controlling member, said intake controlling member belonging to the generating assembly and having a shoulder capable of abutting on the annular piston when the stroke of the actuator piston towards the interior of the pressure chamber of the generating assembly exceeds a predetermined value.
Claim 2
Dependent Claim
296 words
A hydraulic control circuit comprising at least one pressure generating assembly of the piston and cylinder type whose pressure chamber is connected to the pressure chamber of at least one pressure receiving assembly of the piston and cylinder type to define a sealed compartment; at least one compensating assembly of the piston and cylinder type whose compensating chamber is connected to the sealed compartment to define a fluidtight enclosure filled with a predetermined quantity of incompressible fluid, said compensating assembly comprising a compensating piston capable of being displaced towards the interior of the compensating chamber to reduce the volume thereof when the forward stroke of one of the pistons in the generating and receiving assemblies exceeds a predetermined value, the compensating piston cooperating by way of anti-return means with the cylinder of the compensating assembly so as to remain stationary relative to the latter cylinder during the return stroke of the said one of the pistons in the generating and receiving assemblies, said compensating assembly being situated in one of the generating or receiving assemblies, the compensating piston being coaxial with said one of the pistons in the generating and receiving assemblies and cooperating with the latter by way of a one-way thrust coupling with lost motion, said generating assembly comprising a casing, an assembly of concentric pistons mounted in the bore of said casing in a fluidtight manner, said assembly of concentric pistons comprising an annular compensating piston defining a central orifice slidably mounting an actuator piston connected to an intake controlling member, said intake controlling member belonging to the generating assembly and having a shoulder capable of abutting on the annular piston when the stroke of the actuator piston towards the interior of the pressure chamber of the generating assembly exceeds a predetermined value.
Claim 3
Dependent Claim
48 words
A hydraulic control circuit as claimed in claim 1 wherein fluid-tightness of the concentric piston assembly installation in the cylinder of the pressure generating assembly is ensured by a flexible diaphragm provided in the bore of the cylinder and cooperating with the cylinder to form the pressure chamber.
References Cited (Backward Citations)
US3064765A
Cited
US3338337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |