Patent US3326028A successfully refreshed from Google Patents.
US3326028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thrusting devices for rolling mills
Assignee: Hitachi Ltd
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Filing: 1964-03-24
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Granted: 1967-06-20
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Expires: 1984-03-24
Abstract
No abstract record available.
Inventors
- 👤 Kajiwara Toshiyuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:30
CPC Classifications
B; B21; B21B; B21B31/00; B21B31/16; B21B31/20; B21B31/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A THRUSTING DEVICE FOR A ROLLING MILL COMPRISING A HOUSING, A PAIR OF WORKING ROLLS ROTATABLY SUPPORTED IN SAID HOUSING, A PAIR OF AUXILIARY ROLLS ROTATABLY SUPPORTED IN SAID HOUSING AT POSITIONS OUTWARDLY OF SAID WORKING ROLLS SO AS TO URGE SAID WORKING ROLLS INWARDLY FROM BEHIND THEREOF, AND A PAIR OF HYDRAULIC MECHANISMS EACH HAVING A HYDRAULIC CYLINDER OPERABLE TO URGE ONE OF SAID WORKING ROLLS TOWARD THE OTHER THROUGH ONE OF SAID AUXILIARY ROLLS, A PILOT VALVE FOR CONTROLLING HYDRAULIC PRESSURE, A PISTON MEMBER INTERPOSED MIDWAY OF A HYDRAULIC FLUID PASSAGE BETWEEN SAID CYLINDER AND SAID PILOT VALVE FOR MAKING A MOVEMENT PROPORTIONAL TO THAT OF A RAM IN SAID CYLINDER, RESETTING MEANS OPERATIVELY ASSOCIATED WITH SAID PISTON MEMBER FOR ACTUATING THE SAME, AND DRIVE MEANS FOR DRIVING SAID RESETTING MEANS.
Claim 2
Dependent Claim
133 words
A THRUSTING DEVICE FOR A ROLLING MILL COMPRISING A HOUSING, A PAIR OF WORKING ROLLS ROTATABLY SUPPORTED IN SAID HOUSING, A PAIR OF AUXILIARY ROLLS ROTATABLY SUPPORTED IN SAID HOUSING AT POSITIONS OUTWARDLY OF SAID WORKING ROLLS SO AS TO URGE SAID WORKING ROLLS INWARDLY FROM BEHIND THEREOF, AND A PAIR OF HYDRAULIC MECHANISMS EACH HAVING A HYDRAULIC CYLINDER OPERABLE TO URGE ONE OF SAID WORKING ROLLS TOWARD THE OTHER THROUGH ONE OF SAID AUXILIARY ROLLS, A PILOT VALVE FOR CONTROLLING HYDRAULIC PRESSURE, A PISTON MEMBER INTERPOSED MIDWAY OF A HYDRAULIC FLUID PASSAGE BETWEEN SAID CYLINDER AND SAID PILOT VALVE FOR MAKING A MOVEMENT PROPORTIONAL TO THAT OF A RAM IN SAID CYLINDER, RESETTING MEANS OPERATIVELY ASSOCIATED WITH SAID PISTON MEMBER FOR ACTUATING THE SAME, AND DRIVE MEANS FOR DRIVING SAID RESETTING MEANS.
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) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |