US102645A

US102645A - Improvement in screw-propellers

Info

Publication number: US102645A
Authority: US
Publication date: 1870-05-03
Anticipated expiration: 1887-05-03

Description

itat-ted *guette CHARLES ARLEN AND CHARLES GAUTSGHLYOF NEW YORK, N. Y.

Letters Patent No. 102,645, dated May 3, 1870.

IMP'RovnMENT IN scREw-PROPBLLERS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom tt only concern Beit known that we, CHARLES Annex and CHARLES GAUTSCHI, both of the city, county, and State of New York, have invented a new and useful Improvement in Screw Propellers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing forming part of this specification, and in whichl Figurel represents a side view, and

Figure 2 a section, taken longitudinally through its axis, of a screw-propeller, constructed in accordance with my improvement.

Similar letters of reference indicate corresponding parts.

My invention consists in a novel construction of the screw, whereby the water is more effectually restrained from being thrown out laterally by it, and is forced as a column in the rear ot' it, thereby malting the screw more effective, and hy the water being drawn in toward the edge of the screw, preventing the washing of the banks in the propulsion of vessels in canals or other narrow water-courses, for which my invention is more particularly designed.

Referring to the accompanying drawing- A is the operating shaft, and B the screw proper, which is of plate-form, from its `junction with the hub a to its periphery, aud made to constitute an entire screw, as contradistiuguished from screw sections carried by independent arms.

The same may be of any desiredl pitch and coliformation, as regards increase, relativelyto its hub or vouter edge.

The outer edge of said screw or screw-'plate is provided with reverse flanges b b, which are constructed to forni a hollow, o, somewhat of the shape of a V, around the outer edge ofthe 'plate or body of the screw.

Such flanges are not mere or detached sections, nor yet made to constitute a ring or close baud, but form an entire spiral in common with the plate B, and

operate much more efectually to concentrate or cir-x cumscribe'and retain, as a column or confinedhody having its axis in the same line with that of the operating shaft, the water thrown out by the screw,

which not only .adds to the etliciency of the propeller'` but diminishes side wash or action of the water, and

this latter advantage is still more perfectly attained by the hollow o, between the flanges around the outer edge of the' plate or body of the screw,by reason of the diminished velocit-y of the bottom of the hollow as compared with the outer edges or surfaces of the flanges, which inducesvsuction ofthe water into the hollow, and causes it to hug or .follow 'the flanged portion of the. propeller, as the latter is rotated.

\Vhat is here claimed, and desired to be secured by Letters Patent, is Y The spirally arranged flanges b I1, constructed to form a hollow, c, around the outer edge of the spiral plate B, essentially as, shown and described.

GHS'. ARLEN. CHS. GAUTSCHI.

Witnesses:

FRED. HAINEs, R. E. RABEAU.