US Patent: 318,003
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| Compound Steam Engine
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Patentees:
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| John F. Krieger (exact or similar names) - Cincinnati, Hamilton County, OH |
| John H. Eickershoff (exact or similar names) - Cincinnati, Hamilton County, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 20, 1885 |
| Granted: |
May 19, 1885 |
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Joel Havens
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Description: |
| Abstract:
Our invention relates to that class of double or compound engines in which the smaller or high-pressure cylinder acts as a valve-chest and its piston as a governing-valve for the larger or expansion cylinder and piston, its object being to improve their construction and the efficiency and economy of their operation. As heretofore constructed, the form of engine to which our improvements are applied not only exhausted. from the expansion-cylinder between the piston-heads constituting the double piston of the primary or high-pressure cylinder, but also exhausted the residual live steam from the primary-cylinder through an ordinary and separate exhaust-cavity and governed port of a valve and seat. At each stroke, therefore, of the primary piston there way a loss of the residual live steam employed in driving said piston. Moreover, a cutoff valve was applied by means of a supplemental valve-chest in order to enable the engine to be worked "expansively" as a true compound-engine; but such was practically defeated by reason, among others, of the loss of steam-pressure in the large opening afforded by the intermediate steam-chest. These defects involved a serious loss of economy and efficiency in the operation of such engines, which it is the object of our invention to remedy.
Claim:
In a compound engine, the combination of high and low pressure cylinders, the former carrying a double piston operating as a controlling induction and eduction valve for the latter, an exhaust-port opening from the high-pressure cylinder between the pistons thereof, and an induction-valve arranged to govern the admission of steam to the high-pressure cylinder, whereby the steam is solely exhausted from the engine, first from the high-pressure into the low-pressure cylinder, and then back and outward through the sole exhaust-port between the pistons of the high-pressure cylinder. |
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