US381193A - Alexandee vogelsang - Google Patents

Description

ALEXANDER voeELsANa'oF new YORK, hsslenoa TO THE voentsnna soREw PROPELLEB QOMPANY'," or BROOKLYN, NEW YORK,

- SCREW-PFiOiPE-LL ER;

SPECIFICATION forming part of Letters Patent No. 381.193. datd April 17, 1888, i i

Application men November 23, 1887. Serial nast est. (ModeL) V i To all whom it may concern:

Be it knownthat I, ALEXANDER VOGEL: SANG, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Screw-Propellers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. l

My invention relates to screw-propellers; and it has for its object an improvement on my propeller patented April 5, 1887, N01 360,833, In the further development' of my invention by practical demonstration on seagoing vessels I have discovered that better results are obtained from a screw-propeller in'which the leading pointof the cutting-edge of each blade is in advance of the part of the next preceding blade (in the direction in which the vessel is moving) in the same radius than from a screw-propeller in which the leading point of the cuttingedge of each alternate blade only an elevation or side view showing the relation is in advance of the part of the next preceding blade in the same radius;

The invention will be hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, which form a part of this specification, Figure 1 is an'end view of my improved propeller with the lines of construction drawn on one blade,and Fig.2 is

of the leading point of the cutting-edge of one blade to the others and the overlapping oftwo adjacent blades. Y

Reference being had to the drawings and the letters thereon, A represents the hub, from I which radiates a series ofblades, B,whic h may The cutting or entering edge of each =1 UNITED STATES"PATENT: OFFICEQ"a" thatpart of the preceding blade in the same radius,and the leading point d ofthe bladesis in advance of that part of the preceding blade in a corresponding'radius. The blades,(w henarranged in pairs,) which are diametrically opposite'to each other on the hub, havetheir i p cutting or-entering and their trailing or leav j ing edges made to conform to each other; The i contour of one of the edges of eachblademay be composed of lines radiating from'different centers, or right lines and curved line's combined, and the opposite edge of each blade-may be in the form of an ogee or cyma, or it may be a curved line struck from one center and at the hub; or the lines may be angular where s reaching from the end of the blade to the root 1 they radiate from the hub and intersect a curved line from the end of the blade; The

principal feature in the construction is that the leading points 0 or d of the cutting-edges of two succeeding blades are in advanceof 7 eachother, or are situated at different distances from theoenterof the screw-.that is, the lead-,-, V

blade, as shown at c, and the leadingpointd ing point of the cutting-edge of one blade is near the circumference or periphery of the of the next preceding blade is near the hub.-

The leading point of each; blade always falls in a planethat is in advance of the preceding blade in the direction in which the vessel is moving when the screw is viewed from-a side elevation.

otherwords, the blades havingtheirleading points of the cutting-edgenear thecircumfer ence or periphery of the blade are in advance of the part of the next-preceding blade in the same radius, While the leading points'of; the cutting-edges which are near the hub. on the next preceding blades arein the same plane;

I The roots of the blades are disposed upon 5 the hub at an angle to the longitudinal axis of the hub, andthe centers of the working surfaces'of each pair of blades ar e curved in opposite'directions, while the 'centers'of the I blades which radiate at rightanglesthrough, root the axis of the screw cut the blades, so that the major portion of the blades is on the convex side or trailing edge of one pair of blades andthe convex side or cutting-edge of the opposite pair of blades, as shown at e on each blade.

The pitch of the blades may be uniform fromthe hub to the periphery or ends of the blades, or it may be of an expanding or a variable pitch, or the blades may be flatand set at a suitable angle to the shaft; but in either construction all of the blades must be either right or all left screws.

One blade of each pair overlaps or crosses the plane of rotation of the adjacent blade of the next pair of blades, as shown in Fig. 2, and a transverse vertical line through the blades and the hub strikes each blade at the point of intersection or crossing of theblades.

The construction lines and the dotted lines showing the development of the blade are well pnilerstood and require no description in de- By the construction shown each blade presents a leading point on the cutting-edge in advance of the same part of the preceding blade in the same radius, so that the same speed is obtained in either direction'in which plane of the part of the'next preceding blade in thesame radius and in the plane of rotation of the screw, substantially as described.

2. A propeller in which the leading parts of two successive blades are situated at diflerent distances from the hub in a plane which is normal to the axis of the propeller-shaft and the blades diametrically opposite each other are alike, substantially as described.

In testimony whereof I atfix my signature in presence of two witnesses.

ALEXANDER VOGELSANG.

Witnesses:

WILLIAM H. STILLWELL, T. J. DIXON.

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