US Patent: 336,604
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| Hydraulic Forging Press
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Patentees:
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| Ralph H. Tweddell (exact or similar names) - Westminster, Middlesex County, England |
| John Fielding (exact or similar names) - Gloucester, Gloucester County, England |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 11, 1885 |
| Granted: |
Feb. 23, 1886 |
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Joel Havens
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Description: |
| Abstract:
Our invention relates to an improvement in hydraulic presses, and more particularly to presses adapted to forging, and other purposes of a like nature, the object of the same being to provide means for conveniently varying the pressing power,for economizing the pressing-fluid, and for varying the hydraulic cylinders so that they will not interfere with the operation of the press.
Claim:
In a hydraulic press, the combination, with a base or supporting frame, a stationary tool located therein, and a movable tool connected with a crosshead below the base, of a lifting-cylinder located beneath the said crosshead, depressing-cylinders located beneath the base, pipes connected with said depressing-cylinders, and with high and low pressure supply and valves connected with said pipes, whereby a varying pressure can be exerted upon the movable tool at any part of the stroke, substantially as set forth. |
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