Patent US3608586A successfully refreshed from Google Patents.
US3608586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction pads for no-spring model directional valves
Assignee: Vickers Inc
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Filing: 1970-03-23
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Granted: 1971-09-28
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Expires: 1990-03-23
Abstract
Abstract A solenoid-operated valve having a free-floating, sliding spool is provided with frictional detent pins radially urged inwardly by a C-shaped spring. The pins are mounted in a cartridge member having radial bores.
Inventors
- 👤 Leo T Daggy Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:06
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/044; F15B13/0401; F15B13/0402; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T24/00; Y10T24/44; Y10T24/44573; Y10T24/44581; Y10T403/00; Y10T403/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
In a solenoid-operated fluid control valve having a body provided with a cylindrical bore intersected by axially spaced laterally extending fluid ports, a freely floating spool slidable in the bore, and oppositely acting solenoids, each having an operating plunger arranged to actuate the spool in one direction or the other, the improvement comprising a radially movable friction pad contacting one of the plungers, a C-shaped spring surrounding the plunger and pad to maintain a substantially fixed frictional drag on the plunger and hold the spool in whatever position it occupies at the conclusion of a solenoid actuation and means holding the pad from axial movement in the bore.
Claim 2
Dependent Claim
108 words
In a solenoid-operated fluid control valve having a body provided with a cylindrical bore intersected by axially spaced laterally extending fluid ports, a freely floating spool slidable in the bore, and oppositely acting solenoids, each having an operating plunger arranged to actuate the spool in one direction or the other, the improvement comprising a radially movable friction pad contacting one of the plungers, a C-shaped spring surrounding the plunger and pad to maintain a substantially fixed frictional drag on the plunger and hold the spool in whatever position it occupies at the conclusion of a solenoid actuation and means holding the pad from axial movement in the bore.
Claim 3
Dependent Claim
48 words
The valve defined in claim 1 wherein the pad comprises a shouldered pin slidably mounted in a stepped bore, whereby the inward motion of the pin is limited sufficiently to permit initial assembly of the plunger while the spring maintains the pin in its most inward position radially.
Claim 4
Dependent Claim
81 words
The valve defined in claim 1 wherein the means includes an extension of the cylindrical bore adjacent to a solenoid, a plunger retention cartridge positioned in the bore extension and providing a mounting for the pad and its spring, a closure member removably mounted in the end of the bore extension, inner and outer seal rings between the closure and the plunger and the bore extension respectively, and a spring holding the cartridge outwardly against the inner face of the closure.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |