US281915A - Propeller for steam-vessels - Google Patents

Description

(N9 Model.)

M. s. NELSSON.

PROPELLER FOR STEAM VESSELS.

No. 281,915. Patented July 24,1883.

PATENT OFFICE.

MAGNUS S. NELSSON, OF ALLEGHENY, PENNSYLVANIA.

PROPELLER FOR SPECIFICATION forming part of Letters S'TEAM-VESSELS.

Patent No. 281,915, dated m 24., 1883.

Application filed May 12, 1883. (No model.) Y

10 all whom it may concern:

Be it known that I, MAGNUS S. NnLssoN, a citizen of the United States, residing at Alle gheny, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Propellers for Steam -Vessels, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to an. improvement in propellers for steam-vessels, and it consists in a revolving wheel to be applied in pairs or singly and turned by a shaft, the paddles of the wheel occupying the area between its center and circumference, so arranged that when the shaft revolves a number of the paddles revolve upon their own axes, while others remain idle on alevel with the rim of the wheel, to be raised in succession when the former, in their turn, have become idle and it consists, also, in a device for instantaneously reversing the action of the paddles without first stopping the steam-engines.

The accompanying drawings represent my invention. 1

Figure l is a front elevation of a wheel embodying my invention. Fig. 2 is an edge view of the same. Figs. 3, 4, 5, and 6 are detail views of the same.

A represents a shaft, provided at one end with suitable gearing to connect it with the motive power. Near its other end the shaft has an enlargement, and in this the inner ends of rods a, radiating from the center and equidistant from each other, are confined. The outer ends of the rods a are held in a rim, B, of which the shaft is the center. On the rods a revolve the paddles O, that occupy the area inclosed by the rim B, and are in the form of sections of a circle of equal dimensions, with narrow open spaces between their radial sides.

The converging ,ends of the paddles are cut away,and in the open space thus created between the shaft A and the paddles 0 cross blocks (1 are placed on the rods a to support.

and brace the paddles and to cause them to revolve. From under both sides, in the mid dle of the cross-blocks d, project its parts h at a right'angle with the upper part. The projecting parts h are arched on top, so that if placed side by side, they form a circle concentrio with the rim B, with sides radial from the center, as shown in Fig. 6. On the shaft is a sleeve, D, that remains stationarywhen the shaft revolves. The end of the sleeveis in the form of a circular cap, -E, of whi'ch about twothirds of the circumference has a greater diameter than the remain-ingthird. At the juncture of the circles of the different diameters of the cap E are shoulders Z, projecting outwardly, equal to the thickness of the material of which the cap is made, and inwardly on the smaller circle similar shoulders, project as much, the shoulders I and g facing in opposite directions. The under edge of the cap is level, and when in position nearly touches the flat sides of some of the*cross blocks, while the projecting ends'of the parts It occupy the larger circle within the cap E, causing the paddles 011 these blocks to lie flat or level with the rim B. The crossblocks on the remaining paddles are at the same time in a position approaching the vertical at the outer minor circumference of the cap, the parts h flat underneath and the paddles raised. The shaft A, being turned to either side, brings the part h of one of the crossblocks in contact with the shoulder g on the inner circle and turns the paddle up,while on the opposite side the crossblock encounters the shoulder on the greater circle, by which it is turned down. Thus all the paddles are raised successively on one side and turned down on the other'during one revolution of the wheel. On the end of the sleeve D is a lever, L, by the turning of which from, the right to the left, or vice versa, the relative position of the shaft and sleeve is changed, causing an instantaneous reversal of the motion of the paddles without first stopping the engine.

In the foregoing the paddles are described as revolving on the rods a; but they may be made to revolve 011 pivots or in any other manner, so as to be successively turned with the cross-blocks; or they may be cast in one piece with the cross-blocks and turned with them in the manner described.

Having thus described my invention, I claim I 1. In a propeller, the combination of the shaft Awith the rods a and rim B, the sleeve .D, and cap E, provided with the shoulders Z 9 and the blocks (1 72/, and paddles C, substantially as shown.

2. In a propeller, the combination of the paddles pivoted upon suitable journals, the blocks (2 h, secured to their inner ends, and the cap E, having the shoulders which face in opposite directions, substantially as described.

3. In a propeller the combination of the shaft A, the sleeve D, provided With the cap E, having the shoulders which face in opposite directions and which is adapted to be turned upon the shaft so as to reverse the pad dles O, substantially as set forth. IO

In testimony whereof I a'fiix my signature in presence of two witnesses.

MAGNUS S. NELSSON. Vitnesses I. E. I-IIRscH, T. F. LEHMANN.

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