Patent US3680583A successfully refreshed from Google Patents.
US3680583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic sequential operated valve
Assignee: Val-Jac Manufacturing and Supply Co Inc
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Filing: 1971-08-02
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Granted: 1972-08-01
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Expires: 1991-08-02
Abstract
Abstract An automatic four-way valve hydraulically operated for extending and retracting a refuse compaction cylinder, which senses a pressure build-up as the trash is compacted, releasing a pressure responsive detent allowing a spring to drive the valve spool of the primary valve to the return position, allowing the cylinder to retract until it reaches the end of its stroke whereupon a pressure build-up causes a pilot cylinder to move the valve spool to the neutral open center position.
Inventors
- 👤 Gilbert D Clair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:36
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0704; F15; F15B; F15B11/00; F15B11/02; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/31; F15B2211/3105; F15B2211/3116; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/329; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/515; F15B2211/5153; F15B2211/55; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2554; Y10T137/8593; Y10T137/86389; Y10T137/86445; Y10T137/86485
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
146 words
In a four-way directional valve for use with refuse compactors having a valve body containing a valve spool bore including two working ports, supply and return ports, a valve spool contained therein defining a first working position, a reverse flow second working position and middle open center neutral position, the improvement comprising an automatic valve cycling control system including: a pressure responsive detent means for holding the valve spool in the first working position which releases when the working pressure reaches a preset level; spring means urging the valve spool into the second working position whereby as the pressure detent means releases the valve spool is forced across the neutral position to the second working position; and a pilot cylinder means responsive to a preset working pressure in the second working position which overcomes the spring means and forces the valve spool to the neutral position.
Claim 2
Dependent Claim
146 words
In a four-way directional valve for use with refuse compactors having a valve body containing a valve spool bore including two working ports, supply and return ports, a valve spool contained therein defining a first working position, a reverse flow second working position and middle open center neutral position, the improvement comprising an automatic valve cycling control system including: a pressure responsive detent means for holding the valve spool in the first working position which releases when the working pressure reaches a preset level; spring means urging the valve spool into the second working position whereby as the pressure detent means releases the valve spool is forced across the neutral position to the second working position; and a pilot cylinder means responsive to a preset working pressure in the second working position which overcomes the spring means and forces the valve spool to the neutral position.
Claim 3
Dependent Claim
32 words
In a directional valve as set forth in claim 1, wherein the pilot cylinder means includes a pressure relief valve which opens at a set pressure allowing flow to the pilot cylinder.
Claim 4
Dependent Claim
69 words
In a directional valve as set forth in claim 1, wherein the pilot cylinder means includes a pressure relief valve which opens at a set pressure allowing flow to the pilot cylinder, a second spring means urging the pilot cylinder to retract from its extended position and orifice means behind the pilot cylinder venting the fluid to atmosphere, thereby allowing the pilot cylinder to retract from its extended position.
Claim 5
Dependent Claim
25 words
In a directional control valve as set forth in claim 1, wherein the pressure responsive detent means holds the valve spool in the neutral position.
Claim 6
Dependent Claim
58 words
In a directional control valve as set forth in claim 1, wherein the pressure responsive detent means also holds the valve spool in the neutral position, the spring means having sufficient force once the pressure responsive detent releases from the first working position to force the valve spooL across the detented neutral position to the second working position.
Claim 7
Dependent Claim
74 words
In a directional control valve as set forth in claim 1, wherein the pressure responsive detent means also holds the valve spool in the neutral position, the spring means having sufficient force once the pressure responsive detent releases from the first working position to force the valve spool across the detented neutral position to the second working position, further including a manual valve spool operator which can override either the detent or spring means.
Claim 8
Dependent Claim
32 words
In a directional valve as set forth in claim 1, wherein all of the components of the valve cycling control system are integral in the valve body forming a single package unit.
Claim 9
Dependent Claim
37 words
In a directional valve as set forth in claim 1, wherein the pilot cylinder means includes a pilot piston having an orifice therein venting to atmosphere and a compression spring for retracting the pilot piston once extended.
References Cited (Backward Citations)
US2874720A
Cited
US3638683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |