Patent US2687797A successfully refreshed from Google Patents.
Patent US3698435A successfully refreshed from Google Patents.
US3698435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multisection valve and housing therefor
Assignee: Milacron Inc
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Filing: 1971-03-15
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Granted: 1972-10-17
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Expires: 1991-03-15
Abstract
Abstract A valve mechanism has a single bushing and spool containing a plurality of separate valve functions. Each valve function is a section angularly spaced from other valve function sections in the same longitudinal region of the bushing and spool.
Inventors
- 👤 Wendell I Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:30
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86558; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
A valve mechanism having a cylindrical bushing with a bore therethrough, a spool inserted in said bore, said spool comprising a plurality of valve function sections, and said valve mechanism being suited to receive hydraulic fluid under pressure for directing flow to various elements of an hydraulic circuit, said valve mechanism comprising: a. means for providing a plurality of separate valve function sections spaced angularly about the circumference of said cylindrical bushing; b. means associated with said bushing for providing isolated flow pathways through the separate valve function sections; c. means associated with said spool for isolating said function sections from one another to maintain independent circuit utility, whereby independent valve functions are controlled by movement of said spool relative to said bushing; and d. means for maintaining the angular displacement of the spool relative to the bushing.
Claim 2
Dependent Claim
138 words
A valve mechanism having a cylindrical bushing with a bore therethrough, a spool inserted in said bore, said spool comprising a plurality of valve function sections, and said valve mechanism being suited to receive hydraulic fluid under pressure for directing flow to various elements of an hydraulic circuit, said valve mechanism comprising: a. means for providing a plurality of separate valve function sections spaced angularly about the circumference of said cylindrical bushing; b. means associated with said bushing for providing isolated flow pathways through the separate valve function sections; c. means associated with said spool for isolating said function sections from one another to maintain independent circuit utility, whereby independent valve functions are controlled by movement of said spool relative to said bushing; and d. means for maintaining the angular displacement of the spool relative to the bushing.
Claim 3
Dependent Claim
27 words
The apparatus of claim 1 wherein said valve mechanism further comprises means for providing separate valve function sections spaced longitudinally along the axis of said cylindrical bushing.
Claim 4
Dependent Claim
90 words
The apparatus of claim 1 wherein said means associated with said bushing further comprises: a. one set of diametrically opposite ports whereby hydraulic fluid is introduced into the bore of said cylindrical bushing; b. another set of diametrically opposite ports which are angularly displaced from said one set of diametrically opposite ports and contained in substantially the same longitudinal position in the bushing, whereby hydraulic fluid may be introduced or removed from the bore in said bushing; c. flow pathways integral within said bushing communicating selective ports with one another.
Claim 5
Dependent Claim
104 words
The apparatus of claim 1 wherein said spool further comprises: a. one set of diametrically opposite channels for controlling the rate of fluid flow through the bore to the ports in said bushing; b. another set of diametrically opposite channels which are angularly displaced from said one set of diametrically opposite channels and at substantially the same longitudinal position in the spool whereby the flow rate of hydraulic fluid through the bore and bushing is controlled; and c. means for communicating selected channels of the valve spool, whereby hydraulic fluid flow is maintained through the cylindrical bore of the bushing in a preselected manner.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |