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USPTO's for finding information on machinery patents.
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603,475
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May. 03, 1898
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Cut-off mechanism for steam-engines
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John Stumpf |
Chicago, IL |
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1,045,630
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Nov. 26, 1912
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Unidirectional-flow steam-engine
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Johan Stumpf |
, Germany |
This is the first patent for the Stumps Uni-Flow steam engine. See patent 1,285,475 for more information. |
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1,285,475
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Nov. 19, 1918
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Automatic exhaust-valve
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Wolfgang Turnwald |
Syracuse, Onondaga County, NY |
In the Stumpf Una-Flow Engine design, steam enters from either end of the cylinder, and the exhaust is at the mid-line of the cylinder. Steam enters alternately at either end of the cylinder. This interesting design was problematic in practice. For one thing, the cylinder experienced a temperature gradient, cool at the center and hotter and either end, which required the cylinder to be made with a slight taper to compensate. As well, the engine moved quickly, which stressed the valves and required the engine to be heavily built to withstand the stresses.
A 1922 condensed catalog from Ridgway Dynamo & Engine Co. lists "Unaflow Engine: Built under Stumpf patents. Steam jacketed heads, poppet valves and extremely simple valve gear. Bed, governor and reciprocating parts same as on Single Valve Engine. Recommended for high pressures, high superheat, and condensing service. Sizes 100 H.P. to 800 H.P." |