Patent US3891003A successfully refreshed from Google Patents.
US3891003A
Expired / Lapsed
US
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Hydraulic manifold
Assignee: CLARK MICHIGAN COMPANY CIRCLE DRIVE BUCHMANAN MICHIGAN A CORP OF
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Filing: 1974-06-18
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Granted: 1975-06-24
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Expires: 1994-06-18
Abstract
Abstract A manifold for reversing hydraulic connections when one part of the manifold is rotated through part of a revolution relative to the other. The manifold is particularly adaptable to a vehicle having an operator''s station which part of the time faces in one direction and the remainder of the time is reversed and faces in the other direction. This manifold provides for automatically reversing the hydraulic connections when the operator''s station is thus moved so that the operator''s steering wheel always operates in the same mode or manner regardless of which direction the operator is facing.
Inventors
- 👤 Ralph M Duttarer
- 👤 Richard R Hushower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:51
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/64; E02F3/6454; B; B62; B62D; B62D5/00; B62D5/06; B62D5/09; E02F3/65; E02F3/651; E02F3/653; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/5196; Y10T137/8593; Y10T137/85938; Y10T137/877; Y10T137/87829; Y10T137/87837; Y10T137/87861
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
250 words
A manifold for reversing hydraulic connections comprising, an outer annular member, an inner circular member positioned in sealing relation within the said outer member and rotatable relative to the outer member at least a part of a complete revolution, a first pair of connection ports in the said outer member, a second pair of connection ports in the said inner member, a first pair of internal passages in the said inner member connecting the said second pair of ports to a pair of internal ports in register with the said first pair of connection ports, the said first pair of passages arranged so that rotating the said inner member a partial turn relative to the said outer member reverses the hydraulic connections between the said first pair of connection ports and the said second pair of connection ports, a third pair of connection ports axially spaced in the said outer member, a fourth pair of connection ports in the said inner member, and means for maintaining hydraulic connections between the said third pair of connection ports and the said fourth pair of connection ports respectively regardless of the rotative position of the said inner member relative to the said outer member, the said means comprising a pair of grooves in the said inner member in communication with the said third pair of connection ports respectively and a second pair of internal passages in the said inner member interconnecting the said grooves and the said fourth pair of connection ports respectively.
Claim 2
Dependent Claim
250 words
A manifold for reversing hydraulic connections comprising, an outer annular member, an inner circular member positioned in sealing relation within the said outer member and rotatable relative to the outer member at least a part of a complete revolution, a first pair of connection ports in the said outer member, a second pair of connection ports in the said inner member, a first pair of internal passages in the said inner member connecting the said second pair of ports to a pair of internal ports in register with the said first pair of connection ports, the said first pair of passages arranged so that rotating the said inner member a partial turn relative to the said outer member reverses the hydraulic connections between the said first pair of connection ports and the said second pair of connection ports, a third pair of connection ports axially spaced in the said outer member, a fourth pair of connection ports in the said inner member, and means for maintaining hydraulic connections between the said third pair of connection ports and the said fourth pair of connection ports respectively regardless of the rotative position of the said inner member relative to the said outer member, the said means comprising a pair of grooves in the said inner member in communication with the said third pair of connection ports respectively and a second pair of internal passages in the said inner member interconnecting the said grooves and the said fourth pair of connection ports respectively.
Claim 3
Dependent Claim
37 words
A manifold as in claim 1 in which the said first pair of connection ports are located diametrically opposite each other in the said outer member, and the said partial turn is through an angle of 180*.
Claim 4
Dependent Claim
29 words
A manifold as in claim 1 in which the said grooves in the inner member in communication with the said third pair of connection ports are annular in configuration.
Claim 5
Dependent Claim
35 words
A manifold as specified in claim 1 in which the said inner circular member includes conduits interconnecting the said first pair of internal passages, and a normally closed valve for selectively opening the said conduits.
Claim 6
Dependent Claim
37 words
A manifold as specified in claim 1 in which the said inner circular member includes a pair of pressure relief valves connected respectively between the said first pair of internal passages and one of the said grooves.
References Cited (Backward Citations)
US3129644A
Cited
US3568778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |