US3855798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow control device
Assignee: Individual
•
Filing: 1973-03-22
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Granted: 1974-12-24
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Expires: 1993-03-22
Abstract
Abstract A control device for the actuation of a hydraulic load, such as a disk brake, includes a cylinder with an outlet leading to the load, this outlet being separated from an adjoining cylinder chamber by a valve body provided with an elastically deformable peripheral skirt and with a capillary central passage. During the forward stroke of a piston acting upon an oil volume in the cylinder chamber under extraneous pressure, oil can flow around the valve body into the outlet to actuate the load. During the return stroke upon the release of the applied pressure, the deformable skirt blocks the peripheral path of the oil whereby the same can return to the cylinder chamber only through the capillary passage, at a reduced rate, the oil volume in the chamber being supplemented from an adjoining reservoir communicating therewith in the retracted piston position.
Inventors
- 👤 L Spairani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:39
CPC Classifications
F; F15; F15B; F15B7/00; F15B7/06; F15B7/08; B; B60; B60T; B60T11/00; B60T11/10; B60T11/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
195 words
A control device for the actuation of a hydraulic load, comprising: a cylinder provided with a supply chamber for a hydraulic fluid, said cylinder having an outlet leading to the load; a valve body in said cylinder separating said outlet from said chamber, said valve body being provided with a deformable peripheral gasket engaging the cylinder wall, said valve body further having a capillary passage giving access to said outlet from said chamber; a piston in said cylinder forming a movable boundary for said supply chamber, said piston being displaceable by an extraneous force toward said valve body whereby hydraulic fluid is forced from said chamber into said outlet partly by way of said capillary passage and partly around the periphery of said valve body, said gasket yielding to fluid pressure from said chamber to give passage to said fluid; and restoring means engaging said piston for returning same to an initial position remote from said valve body upon cessation of said extraneous force, thereby drawing fluid from said outlet back into said chamber by way of said capillary passage only, said gasket substantially preventing any return flow around the periphery of said valve body.
Claim 2
Dependent Claim
195 words
A control device for the actuation of a hydraulic load, comprising: a cylinder provided with a supply chamber for a hydraulic fluid, said cylinder having an outlet leading to the load; a valve body in said cylinder separating said outlet from said chamber, said valve body being provided with a deformable peripheral gasket engaging the cylinder wall, said valve body further having a capillary passage giving access to said outlet from said chamber; a piston in said cylinder forming a movable boundary for said supply chamber, said piston being displaceable by an extraneous force toward said valve body whereby hydraulic fluid is forced from said chamber into said outlet partly by way of said capillary passage and partly around the periphery of said valve body, said gasket yielding to fluid pressure from said chamber to give passage to said fluid; and restoring means engaging said piston for returning same to an initial position remote from said valve body upon cessation of said extraneous force, thereby drawing fluid from said outlet back into said chamber by way of said capillary passage only, said gasket substantially preventing any return flow around the periphery of said valve body.
Claim 3
Dependent Claim
23 words
A control device as defined in claim 1 wherein said gasket forms a frustoconical skirt around said valve body diverging toward said outlet.
Claim 4
Dependent Claim
16 words
A control device as defined in claim 2 wherein said skirt has a generally J-shaped cross-section.
Claim 5
Dependent Claim
24 words
A control device as defined in claim 1 wherein said restoring means comprises a coil spring inserted between said valve body and said piston.
Claim 6
Dependent Claim
36 words
A control device as defined in claim 1, further comprising a fluid reservoir communicating with said chamber through a port in the cylinder wall, said port being blockable by said piston in an advanced position thereof.
Claim 7
Dependent Claim
46 words
A control device as defined in claim 5 wherein said piston is provided with a further peripheral gasket obstructing said port in said advanced position, said further gasket being sufficiently deformable to give passage to fluid from said reservoir during a return stroke of said piston.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |