US2404044A - Propelling device - Google Patents

Description

Jufly i, 1946. M. FALK I PROPELLING DEVICE Filed Aug. 23, 1945 2 Sheets-Sheet l INVENTOR.

ATTORNEY.

uHy E6, 1946. M. FALK PROPELLING DEVICE Filed Aug. 25, 1945 2 Sheets-Sheet 2 INVENTOR. 7

ATTORNEY.

Patented July 16, 1946 UNITED STATES PATENT OFFICE R PELLING DEVICE Mar us Falk,Boston, Mass. Application August 23, 1945,-Serial No. 612,190

' l 4 Claims. (01. 170%141) This invention relates to a propelling device for a boat.

One object of my invention is to provide a new and useful propelling device-one that is protected and guided by the same mean during the major part of its rotative travel.

The foregoing and other objects which will appear as the nature of the invention is better understood, may be accomplished by a construction and arrangement of parts, such as is disclosed by the drawings and specification. The nature of the invention is such as to render it susceptible to various changes and modifications, and, therefore, I am not to be limited to said disclosure; but am entitled to all such changes therefrom as fall within the scope of my claims.

In the drawings:

Figure 1 is a top plan view of my propelling device attached to a boat, and

Figure 2 is a side elevational view of the same.

Figure 3 is a sectional view taken on the line -33 of Figure 2 and Figure 4 is a sectional view taken on the line 4-4 of Figure 2.

Figure 5 is a front elevational view of my device attached to the stern of a boat.

Figure 6 is an enlarged, perspective view of a propeller scoop or blade showing a fragment of the propeller body.

Figure 7 is an enlarged, perspective view of the propeller guide member mounted to a supporting bracket that is attached to a boat.

As illustrated, a propeller H) is associated with a stationary guide member H! which is partly circular, being more than half but less than a whole circle. Its lower edge I 3 is horizontal or truncated or, at least, there is a break in the continuity of the circle. Said propelling device has a circular disc-like body portion IS on the periphery of which are blades or scoops l 6 which have a rear portion or back Ilia and a side lfib. Said body l5 serves as another side. Said scoops l6 taper in depth as they curve inwardly towards said body portion l5 as shown in Figure 2 of the drawings. The inner surfaces of said scoops I6 are closed to the peripheral surface of said guide member I2 and, therefore, its sides are lower, to avoid having said scoops I6 holding any appreciable amount of water while they are located opposite said guide member I'Z during the rotative movement.

Said guide member I2 is fixedly attached, as by welding, to a supporting bracket 18. Said bracket l8 may be attached to the stern of a boat B by bolts M. A stud I9 extends through said guide member l2, propeller body l5 and bracket 18-, said propeller body rotating on it. Said scoops iii are outside of but rotate close to the rounded, peripheral surface of said guide member l2, except when their path of rotation is below it, opposite said surface l3.

Fixed to said propeller body I5 is a stud 22 on which a connector head 24 is mounted, to which head 24 a connecting rod 25 is fastened which in turn is actuated by a well known motor or the like, not shown, thus driving said propeller H] by a crank-like motion which forcibly brings said scoops l6 into contact with the water as said body I5 is rotated, thus propelling the boat forward. To propel in a reverse direction said propeller I0 is rotated reversely and said back i511 pushing against the water will cause a reverse movement of said boat B.

The number of scoops l6 carried by propeller body [5 may be varied, depending upon the size of said body IS, the speed desired, et cetera, and likewise their size may be varied.

The width of said guide member l2 at its rounded periphery, should be at least equal to the width of a said scoop 16. If said guide memher is hollow its lower edge It shouldbe closed.

In operation, a motor actuates said connecting rod 25 which in turn rotates said propeller [0 by a crank-like motion which carries said scoops I 6 into the water during part of their travel, thus driving the boat forward.

What I claim is:

l. A propelling device comprising a propeller embodying a body portion having a plurality of blades, at the periphery thereof, a guide member associated therewith having a portion of its peripheral surface curved and a portion straight, means to support said member and propeller adapted to be connected to a boat, and means operatively connected to said propeller to rotate it, said blades being outside of, opposite to and adjacent said curved peripheral surface.

2. A propelling device comprising a propeller embodying a body portion having a plurality of scoops at the periphery thereof that extend laterally beyond said body portion, a guide member having a portion of its peripheral surface in the form of a partial circle and having a non-circular portion, said scoops being so positioned on said body portion with relation to said guide member curved peripheral surface that said scoops pass at a point outside of, adjacent and opposite to said circular surface, means to support said guide member and propeller adapted to be connected 3 r to a boat, and means operatively connected to said propeller to rotate it.

3. A propelling device comprising a propeller embodying a body portion having a plurality of blades at the periphery thereof that extend laterally beyond said body portion, said blades embodying a back, a bottom and a side portion and being so positioned that a portion of said body provides a side for said blade opposite to but spaced from said side portion, a guide member in the form of a partial circle that is more than half a circle and whose lower edge is truncated, said scoops being so positioned with relation to the curved portion of said guide member that they pass at a point outside of, adjacent and opposite to the peripheral surface of said circular portion, the width of the peripheral surface of 1 said circular portion of said guide member being 4. A propelling device comprising a propeller embodying a body portion having four scoops at the periphery thereof, that extend laterally beyong said body portion, said scoops embodying a back, a bottom and a side portion and being so positioned that a portion of said body provides a side for said blade opposite to but spaced from said side portion, said side portion tapering inwardly from said back, a guide member in the form of a partial circle that is more than half a circle and whose lower edge is truncated, said scoops being so positioned with relation to the curvedportion of said guide member that they pass at a point outside of, adjacent and opposite to the peripheral surface of said circular portion, the width of the peripheral surface of said circular portion of said guide member being as great as the width of said scoops, means to support said guide member and propeller adapted to be connected to a boat, and means operatively connected to said propeller to rotate it.

MARCUS FALK.

Images