US559775A - Propeller - Google Patents

Description

N. W. FRENCH.

PRUPELLER.

Patented May 5, 1896.

INVENTOH ATTORNEYS.

ANDREW BGRANAM,PHOTDUTHQWASMMEYONJ C UNITED STATES PATENT FFlCE.

NELSON WM. FRENCH, OF SAYRE, PENNSYLVANIA.

PROPELLER.

SPECIFICATION forming part of Letters Patent No. 559,775, dated May 5, 1896. Application filed August 10,1895. Serial No. 558,902. (No model.)

To all whom it may concern:

Be it known that I, NELSON WM. FRENCH, residing at Sayre, in the county of Bradford and State of Pennsylvania, have invented a new and Improved Propeller, of which the following is a specification.

My improved propeller is formed of flat elongated blades or paddles arranged at a certain angle longitudinally (preferably at fortyfive degrees) to the shaft and secured to oval or elliptical sections of the latter, said sections being arranged with their longer axes at right angles to eachother, and the arms being clamped thereon in such manner as to adapt them for adjustment along the shaft.

In accompanying drawings, Figure 1 is a side view showing my invention applied to a boat or vessel. Fig. 2 is a perspective view of my invention. tive view of one of the blades of the same.

The propeller blades or paddles A are thin flat elongated metal plates, preferably iron or steel, having parallel side edges and rounded or circular front ends a. They are arranged with their transverse axes radial and their longer axes at angles of about forty-five degrees to the propeller-shaft. Thus ablade or paddle on one side of the latter is at a right angle to the one on the opposite side. The

blades A are attached to arms 0, which are arranged in pairs, each arm forming part of a clamp applied to the shaft-hub D. There are two pairs or sets of such arms, and thus two sets of clamps for each blade. Either clamp G O can be adjusted on the hub D lengthwise of the latter. The hub D is keyed in the shaft B and constructed of two oval or elliptical sections d, which are joined integrally, one being arranged with its longer transverse axis at a right angle to that of the other section. The inn er ends of the paddlearms A are flat and curved to adapt them to fit one side of a hub-section, and such curved parts are secured and form the clamp before described by means of screw-bolts c passing through them at points outside of but contiguous to the angles of the hub-sections d. The outer portion of each arm 0 is twisted on its axis to adapt it to support and fit against Fig. 3 is an edge perspeca blade or paddle A in the required manner. The attachment of the blades A to the arms 0 is efiected by screw-bolts whose heads are countersunk in the blades A. It will be per ceived that by loosening the bolts 0, that clamp either set of arms 0 on a hub-section d, and the bolts that secure the blade A to said arms, the latter can be adjusted along the hub-sections 02, so that the propeller as a whole may be shifted nearer to or farther from the adjacent body of the boat.

Y'Vhile two hub-sections d and two sets of arms 0 are shown, it is apparent that three or even more might be employed; but ordinarily two will suffice.

The shaft requires an outside bearing, between which and the inside or stern bearing the propeller is arranged. Each paddle or blade is four feet in length for one in breadth and is about one-third longer than the diameter of the propeller. Thus each blade has a much greater superficial area than those of the common screw-propeller. The advantage in propulsive effect is proportional.

Having thus-described my invention, what I claim, and desire to secure by Letters Patent, is-

1. The oombin ationpvith the shaft and hub, formed of elliptical sections whose longer transverse axes are at an angle to each other, of two sets of arms which are clamped on said sections and have their outer portions twisted, and elongated blades or paddles, bolted to such end portions, and arranged at a longitudinal angle to the shaft, as shown and de scribed.

2. The combination,with the shaft, and hub having oval sections which are arranged at a transverse angle to each other, paddles or blades, and arms whose inner flat portions embrace and are clamped on the hub, and whose outer ends are bent laterally and twisted to adapt them to hold the paddles at the proper angle and fit flat upon the same, as shown and described.

NELSON \Vllii. FRENCH.

Witnesses:

T. J. lvIOELHENY, L. II. VAN KIRK.

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