US3848525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control means for opposed rams of a press
Assignee: Wean United Inc
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Filing: 1973-08-30
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Granted: 1974-11-19
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Expires: 1993-08-30
Abstract
Abstract In an hydraulic press having opposed work performing rams a control for synchronizing the movements of the rams during their working strokes comprises several sets of limit switches for each ram arranged in the direction of the travel of the rams, the switches of similar sets being coordinated to interrupt the movement of the rams in the event an undesirable degree of travel occurs in one ram as compared with the other.
Inventors
- 👤 F Kent
- 👤 S Steinbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:59
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/16; B30B15/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
In a press having opposed rams and means for causing said rams to advance towards each other during their working strokes, a control means including a set of at least two movement detecting means for each ram arranged to monitor the movements of their associated rams, said detecting means forming zones of variable lengths, and means for coordinating said sets of movement detecting means in a manner to interrupt movement of one of the rams in the event an undesirable degree of travel occurs in one ram as compared with the other until the lagging ram reaches a desired synchronized position to the interrupted ram.
Claim 2
Dependent Claim
105 words
In a press having opposed rams and means for causing said rams to advance towards each other during their working strokes, a control means including a set of at least two movement detecting means for each ram arranged to monitor the movements of their associated rams, said detecting means forming zones of variable lengths, and means for coordinating said sets of movement detecting means in a manner to interrupt movement of one of the rams in the event an undesirable degree of travel occurs in one ram as compared with the other until the lagging ram reaches a desired synchronized position to the interrupted ram.
Claim 3
Dependent Claim
110 words
In a press in accordance with claim 1, wherein said sets of movement detecting means include several sets of coordinated limit switches for each ram arranged in spaced-relationship to the direction of travel of said rams in a manner to form zones of variable lengths, means for coordinating similar sets of limit switches with respect to the path of travel of their associated rams in a manner to synchronize the travel of the rams by causing interruption of the operation of an advancing ram and a continuation of the operation of a lagging ram until all the limit switches of related sets have been operated on by their associated rams.
Claim 4
Dependent Claim
94 words
In a press according to claim 2, wherein said limit switches are constructed and arranged so that initially on operation of the rams a limit switch of each set is closed and is opened and remains opened on movement of their associated rams and a second limit switch of each set is opened and is closed and remains closed by movement of their associated rams, the limit switch of each set that is opened serving to interrupt a travel of their associated rams until the limit switch of the same set has been closed.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |