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Publication numberUS1813552 A
Publication typeGrant
Publication dateJul 7, 1931
Filing dateApr 2, 1930
Priority dateApr 2, 1930
Publication numberUS 1813552 A, US 1813552A, US-A-1813552, US1813552 A, US1813552A
InventorsJohn Stechauner
Original AssigneeGabriel Goetz, John Haas
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Propelling mechanism
US 1813552 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

July 7, 1931.

J. STECHAUNER 1,813,552



whereby the efficiency of the propelling unit may be greatly increased with only a small expenditure of additional energy. More particularly, the invention consists in the association of two propellers of substantially the same size and of opposite pitch mounted adjacent each other, each on a drive shaft arranged concentric to and driven in the opposite direction to the other shaft.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings Fig. 1 is an elevation view of an outboard motor equipped with propelling mechanism embodying the invention;

Fig. 2 is a detail vertical, sectional view through the propelling mechanism;

Fig. 3 is a detail sectional view taken on the line 33 of Fig. 2;

Referring to Figs. 1 to 3, inclusive, the numeral 6 designates a rowboat, 7 an outboard motor secured thereto in known man- :a ner, embodying the usual engine suitably connected to drive the vertically disposed transmission shaft 8 suitably journalled in the casing 9.

The shaft 8 carries a bevel gear 10 meshing with oppositely disposed bevel gears 11 and 12, respectively fixed to propeller shafts 13 and 14, the shaft 1st being hollow and journalled in a bearing portion. 15 of the casing, while the shaft 13 is journalled at one end 16 in the casing and extends through and is rotatably mounted within the hollow shaft 14. Thus the shafts 13 and 14 are concentrically mounted and because of the gearing above described are driven in opposite directions and at the same speed.

The shaft ll has a propeller 17 mounted thereon against a shoulder 18 and securely clamped thereto by a nut 19 on the threaded end of said shaft.

The shaft 13 has a propeller 20 mounted thereon to rotate therewith in any suitable manner, as by means of clamping nuts21 and 22.

The propellers 17 and 20 are of substantially the same pitch ratio, but of opposite pitch and of substantially the same size.

The gear ratio of the drive mechanism above described is unity, so that the pro pellers 17 and 20 are driven at substantially the same speed.

It will be observed that the two oppositely revolving propeilers are mounted adjacenteach other so that the first propeller forces the water or air against the other so that the second propeller can act with more force thereon. That this action does occur has been demonstrated by trials of a-device embodying the invention, wherein it has been found that for an additional expenditure of energy of only one and four-tenths per cent over that required to drive one propeller, I obtain almost one-third more tractive effort by the use of thetwo over a single propeller. Thus, it will be understood that the propellers are arranged close enough together that the reactive componcuts of one are within the range of action of the other and where the pitch of the propellers is great, the propellers should be ar-' ranged more closely together than where the pitch is smaller, since with the greater pitch the water or air streams againstwhich the the second propeller works are shorter than those where the pitch is less. In the use of these two propellers it will be observed that the first propellerovercomes the inertia or the resistance of the mass in which the propeller is working and that the second propeller is, therefore, substantially relieved of this duty and bores its Way through the stream or immediate wake of the first propeller.

While the two-blade propellers have been shown, it is obvious that three or more blades may be used on the propellers for larger craft and while an outboard motor is shown, it is obvious that the invention may be applied to other forms of marine propulsion apparatus without departing from the spirit of this invention.

I, therefore, desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts except insofar as such limitations are 5 included in the claim.

lVhat I claim as my invention is:

In a propelling mechanism, the combine tion with an underwater housing, of a power transmission shaftjournalled in said housing andextending lengthwise" thereof and provided with a bevel gear, a sleeve shaft extending at right anglesto said first; named shaft and journalled in one end of said housing and provided with a' bevel gear;

meshing With said first named gear and having a shoulder exterior of said housing,- a propeller mounted on said second sleeve shaft and abutting said shoulder, athird shaft extending atri'ght angles to said first shaft and journa'lled in said housing and extending through said sleeve shaft provided with a bevel gear meshing with said first named bevel gear, and a propeller mounted on the outer end of said third shaft, said propellers being of substantially similar pitch ratio and size but of opposite pitch and mounted adjacent each other, saidsecond and third named bevelv gears being disposed on opposite sides of said first named bevel gear and being of the same pitch diameter.

In testimony whereof, I aflix my signa ture;


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2987031 *Jul 24, 1959Jun 6, 1961Odden Conrad RDual propeller propulsion
US5514014 *Nov 29, 1994May 7, 1996Sanshin Kogyo Kabushiki KaishaOutboard drive transmission
US5522703 *Oct 26, 1994Jun 4, 1996Sanshin Kogyo Kabushiki KaishaPropulsion system seal for outboard drive
US5556312 *May 31, 1995Sep 17, 1996Sanshin Kogyo Kabushiki KaishaBearing arrangement for marine transmission
US5556313 *May 31, 1995Sep 17, 1996Sanshin Kogyo Kabushiki KaishaOutboard drive transmission
US5558498 *May 31, 1995Sep 24, 1996Sanshin Kogyo Kabushiki KaishaPropeller shaft assembly for marine propulsion system
US5575698 *Nov 29, 1994Nov 19, 1996Sanshin Kogyo Kabushiki KaishaOutboard drive transmission system
US5597334 *Jun 5, 1995Jan 28, 1997Sanshin Kogyo Kabushiki KaishaOutboard drive transmission system
US5601464 *Nov 30, 1994Feb 11, 1997Sanshin Kogyo Kabushiki KaishaTransmission system for counter-rotational propulsion device
US5697821 *May 31, 1995Dec 16, 1997Sanshin Kogyo Kabushiki KaishaBearing carrier for outboard drive
US5716247 *Jun 27, 1996Feb 10, 1998Sanshin Kogyo Kabushiki KaishaBearing arrangement for marine transmission
US5800223 *May 22, 1996Sep 1, 1998Sanshin Kogyo Kabushiki KaishaMarine propulsion device
US5807151 *Oct 18, 1996Sep 15, 1998Sanshin Kogyo Kabushiki KaishaPropeller for marine propulsion drive
US7153101 *Dec 25, 2004Dec 26, 2006Ab Volvo PentaPulling marine propeller
US7226327 *Dec 22, 2005Jun 5, 2007Ab Volvo PentaOutboard drive for boats
US7503818Aug 23, 2007Mar 17, 2009James HaganPropulsion system for a ship or seagoing vessel
US9328613 *Nov 12, 2012May 3, 2016Becker Marine Systems Gmbh & Co KgPropeller arrangement, in particular for watercraft
US20050084382 *Dec 25, 2004Apr 21, 2005Ab Volvo PentaPulling marine propeller
US20060166569 *Dec 22, 2005Jul 27, 2006Ab Volvo PentaOutboard drive for boats
US20090053944 *Aug 23, 2007Feb 26, 2009James HaganPropulsion system for a ship or seagoing vessel
US20130129514 *May 23, 2013Becker Marine Systems GmgH & Co. KGPropeller arrangement, in particular for watercraft
DE3519599A1 *May 31, 1985Jan 2, 1986Steyr Daimler Puch AgBoat drive
U.S. Classification416/129, 416/244.00B, 416/223.00R, 440/80
International ClassificationB63H5/00, B63H5/10
Cooperative ClassificationB63H5/10
European ClassificationB63H5/10