US Patent: 176,541
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| Raising and Lowering Screw Propellers
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Patentees:
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| Merwin McKaig (exact or similar names) - Cumberland, Allegany County, MD |
| Walter J. Muncaster (exact or similar names) - Cumberland, Allegany County, MD |
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Patent Dates:
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| Applied: |
Apr. 05, 1876 |
| Granted: |
Apr. 25, 1876 |
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Patent Pictures:
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Joel Havens
"Vintage Machinery" entry for W. W. McKaig & Son
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Description: |
| Walter J. Muncaster was the plant superintendent for W. W. McKaig & Son foundry.
Abstract:
The prospect that steam will soon supersede animal power in the propulsion of boats on canals has led to many improvements in the structure of engines, &c., with a view to their adaptation to the peculiar requirements of canal navigation. A principal requirement of the 3ase is facility for raising and lowering the propulsion-wheel; because, when loaded, the boat will barely clear the bottom, and said wheel must then be entirely above the line of the keel, and when unloaded she draws but a few inches of water and the propulsion-wheel, if unchanged in position, would not then be sufficiently submerged. It has therefore been heretofore proposed to place the engine upon a horizontal frame, mounted upon transverse bearings, about midway between the said engine and said wheel, so that as the said wheel is lowered the engine is correspondingly raised, and vice versa. The purpose of this arrangement is to simplify the structure, to enable the engine to apply its force directly to the rotating shaft at all times, because their relative positions are always unchanged, and to dispense with universal joints, or substitutes therefor, in changing the direction of motion. This principle of structure has been employed with paddle and screw-propellers; and hence we do not claim anything more than the peculiarities of structure hereinafter fully described, whereby a vertical engine and screw-propeller are rendered more simple in structure, compact, and efficient, and the propeller and engine more readily handled than heretofore.
Claim:
The vertical engine-frame B, mounted upon trunnions A, and provided with the tubular arm C, extending through the stern of the boat and provided with the boxes G G and D, combined with the crank-shaft F, mounted in said boxes. |
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