US3081826A - Ship propeller - Google Patents

Ship propeller Download PDF

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Publication number
US3081826A
US3081826A US4909A US490960A US3081826A US 3081826 A US3081826 A US 3081826A US 4909 A US4909 A US 4909A US 490960 A US490960 A US 490960A US 3081826 A US3081826 A US 3081826A
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hub
point
pressure
axis
trailing edge
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US4909A
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Loiseau Christophe
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Loiseau Christophe
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63HMARINE PROPULSION OR STEERING
    • B63H1/00Propulsive elements directly acting on water
    • B63H1/02Propulsive elements directly acting on water of rotary type
    • B63H1/12Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14Propellers
    • B63H1/26Blades

Description

March 19, 1963 c. LOISEAU sx-up PROPELLER 5 Sheets-Sheet 1 Filed Jan. 27, 1960 L -lblli March 19, 1963 c. LOISEAU 3,081,826 SHIP PROPELLER Filed Jam- 27, 1960 3 Sheets-Sheet 2 March 19, 1963 c. LOISEAU 3,081,826
SHIP PROPELLER Filed Jan. 27. 1960 5 Sheets-Sheet. 3
3,081,826 SHIP PROPELLER Christophe Loiseau, deceased, late of Maine et Loire, France, by Christophe Loiseau, La Seguiniere, Maine ct Loire, France, son and heir Filed Jan. 27, 1960, Ser. No. 4,909 2 Claims. (Cl. 170-159) This invention relates to improvement in ship propellers, and more particularly to screw propellers of the so-called Weedless type having the blades so constructed as to throw oif any weeds, driftwood or other floating matter when the propeller is operating forwardly. The present applica tion is a continuation in part of the application Serial No. 593,717 filed in the United States Patent Office June 25, 1956, now abandoned.
In Weedless screw propellers of conventional design, the spiral blades are so constructed as to cause the pressure surface of the blades to thrust only rearwardly against the water in which the propeller turns, whereby when any weeds, grass or other obstructions are engaged by the blades, the revolution thereof has the inherent tendency to cast most of such vegetable growth without the radius of revolution, while a part of the vegetable growth is cut into small pieces as it is taken into the spiral with the water picked up by the screw propeller.
The object of the present invention is to provide an improved weedless ship propeller construction whereby the blades are rendered more effective.
The invention broadly stated resides in the formation of the pressure surface of the blades of a Weedless propeller in such a manner that while they produce a most efficient rearwardly-acting thrust, they also produce a substantially radial outward thrust impelling water radially outward from the periphery of the propeller to thereby prevent some weed or floating matter from engagement by the leading edges of the blades.
In order that the invention may be clearly understood and readily carried into effect, reference is directed to the accompanying drawings, wherein:
FIG. 1 is a side elevational view of a propeller embodying the invention;
FIG. 2 is a bottom plan view of this propeller;
FIG. 3 is a bottom plan view of a propeller embodying the invention, provided with three blades.
FIG. 4 is a side elevational view of a propeller embodying the invention, the leading edges of the propeller blades being inscribed in a conical surface; 7
FIG. 5 shows the base circle of the conical surface represented in FIG. 4;
F121G. 6' is a perspective view of the propeller shown in FIGS. 7, 8 and 9 are sections taken along the correspondingly numbered lines of FIG. 5.
Referring to the drawings, in which the same reference characters are used throughout the figures for the same or equivalent parts, the propeller comprises a plurality of identical blades 1 extending helically from a hub 2. Each of the blades 1 comprises a leading edge 4 commencing at a point near one longitudinal end of hub 2 and a trailing edge 5 commencing at a point a near the other longitudinal end of the hub.
The leading edge 4 of each blade 1 is inscribed in a cone a (FIGS. 4 and 5) having its axis in coincidence with the axis O-O of hub 2 and its apex b directed toward the ship, and the trailing edge 5 of each blade 1 has an inner length portion starting from point C inscribed in a conus c having its apex d directed toward the ship and the outer length portion of convex curvature to join the leading edge 4 at the outer end of the blade along a curved line in accordance with usual practice. The exact atct O ice outline of the blade is immaterial the present illustration being of a conventional blade extending around the hub and defining a spiral shaped pressure surface area producing the desired rearward thrust upon the water, the propeller being enabled to slip or slide past vegetable growth or floating objects it may strike in the water, as this is well known in the art.
According to the invention, an outwardly curved line indicated at g by dot-and-dash lines and extending from point e to point 1 of the trailing edge 5 divides the pressure surface area of each blade 1 longitudinally into a trailing surface portion 3 and a leading surface portion 6, the trailing surface portion 3 being concave so that all sections through the blade, in radial planes containing the axis O-O of hub 2 as shown at A in FIG. 2 or as represented in FIGS. 7, 8 and 9, will produce on the lead ing surface portion 6 the usual straight radial line h, and on the concave trailing surface portion 3 a curved line i which is in the form of an arc of circle lying in the same radial plane than the straight line it, it being understood that the radius of the arc of circle formed by each line i increases progressively as the radial section lines such as shown in FIGS. 7 and 9 and passing near the points e and 1, respectively of trailing edge 5 approach. the radial section line shown in FIG. 8 and passing through a point of the trailing edge lying substantially at midway between the points e and f. It will now be apparent that while the leading surface 6 of the propeller blades 1 produces a substantially axial pressure component, the trailing surface 3 produces a substantially radial outward pressure component capable to push on any weeds or floating matter from the periphery of the propeller.
The pressure surface of the blades being shaped as shown and described, and the concave portion of the pressure surface area extending axially preferably beyond the outer end of the blade, makes the propeller particularly well adapted for running in among long grasses and weeds, without liability of the winding of the grass and weeds about the blades.
The foregoing is not to be construed as limiting the invention in respect to the number of blades and to the proportions shown, and in respect to the exact curvature of the line g and of the trailing edge 5 shown.
What is claimed is:
l. A ship propeller comprising a hub having a forward and rearward end and a plurality of substantially identical blades extending helically from said hub around the axis thereof, each blade having its leading edge starting from a point near the longitudinal forward end of the hub and its trailing edge starting from a point near the rearward longitudinal end of the hub, each leading edge being inscribed in a cone having its apex directed forward and its axis in coincidence with the axis of the hub and each trailing edge having the inner portion thereof of concave curvature and the outer portion of convex curvature, and
the pressure surface of each blade comprising a major portion of spiral conformation generated by a straight line moving longitudinally of said axis of the hub generally normal thereto to provide a substantially axial pressure component, and a transverse concave minor portion de fined by said trailing edge and bounded by an outwardly curved line extending on said pressure surface from a point at the inner end of said generating line located substantially at the inner end of said trailing edge to a point located substantially at the outer end thereof, said concave minor portion of the pressure surface being shaped to provide a substantially radial outward pressure component.
2. A ship propeller according to claim 1, in which any section through said major portion and said minor portion of said pressure surface, in a radial plane containing said axis of the hub, produces a straight radial line on said major portion and a curved line on said minor portion, said curved line having the form of an arc of a circle lying in said radial plane.
References Cited in the file of this patent UNITED STATES PATENTS 4 Weidinger June 2, 1925 Halvorsen May 19, 1931 Pilet May 10', 1932 Callahan June 14, 1932 McM-ahan June 26, 1934 Mattson Dec. 22, 1942 FOREIGN PATENTS Great Britain of 1869 Great Britain of 1892 Sweden Nov. 26, 1940 France Nov. 10, 1953 Great Britain of 1902

Claims (1)

1. A SHIP PROPELLER COMPRISING A HUB HAVING A FORWARD AND REARWARD END AND A PLURALITY OF SUBSTANTIALLY IDENTICAL BLADES EXTENDING HELICALLY FROM SAID HUB AROUND THE AXIS THEREOF, EACH BLADE HAVING ITS LEADING EDGE STARTING FROM A POINT NEAR THE LONGITUDINAL FORWARD END OF THE HUB AND ITS TRAILING EDGE STARTING FROM A POINT NEAR THE REARWARD LONGITUDINAL END OF THE HUB, EACH LEADING EDGE BEING INSCRIBED IN A CONE HAVING ITS APEX DIRECTED FORWARD AND ITS AXIS IN COINCIDENCE WITH THE AXIS OF THE HUB AND EACH TRAILING EDGE HAVING THE INNER PORTION THEREOF OF CONCAVE CURVATURE AND THE OUTER PORTION OF CONVEX CURVATURE, AND THE PRESSURE SURFACE OF EACH BLADE COMPRISING A MAJOR PORTION OF SPIRAL CONFORMATION GENERATED BY A STRAIGHT LINE MOVING LONGITUDINALLY OF SAID AXIS OF THE HUB GENERALLY NORMAL THERETO TO PROVIDE A SUBSTANTIALLY AXIAL PRESSURE COMPONENT, AND A TRANSVERSE CONCAVE MINOR PORTION DEFINED BY SAID TRAILING EDGE AND BOUNDED BY AN OUTWARDLY CURVED LINE EXTENDING ON SAID PRESSURE SURFACE FROM A POINT AT THE INNER END OF SAID GENERATING LINE LOCATED SUBSTANTIALLY AT THE INNER END OF SAID TRAILING EDGE TO A POINT LOCATED SUBSTANTIALLY AT THE OUTER END THEREOF, SAID CONCAVE MINOR PORTION OF THE PRESSURE SURFACE BEING SHAPED TO PROVIDE A SUBSTANTIALLY RADIAL OUTWARD PRESSURE COMPONENT.
US4909A 1960-01-27 1960-01-27 Ship propeller Expired - Lifetime US3081826A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936228A (en) * 1974-05-08 1976-02-03 Symbol Paul P Boat Propeller
US4080099A (en) * 1976-05-02 1978-03-21 Brunswick Corporation Propeller
US4604193A (en) * 1983-03-25 1986-08-05 E Et M Lamort S.A. Method and apparatus for sorting out a mixture of paper pulp and contaminants
FR2583709A1 (en) * 1985-06-25 1986-12-26 Maximov Vadim Propulsive helix
US4775297A (en) * 1986-03-12 1988-10-04 Klein, Schanzlin & Becker Aktiengesellschaft Non-clogging impeller for use in axial and mixed-flow centrifugal pumps
US5352093A (en) * 1989-07-24 1994-10-04 Hannon R Douglas Weedless propeller
US5681146A (en) * 1996-10-04 1997-10-28 Future Sea Farms Inc. Low head pumping system for fish farms
EP1238185A1 (en) * 1999-11-25 2002-09-11 Jayden David Harman A single or multi-bladed rotor
US20040238163A1 (en) * 2002-01-03 2004-12-02 Harman Jayden David Heat exchanger
US20040244853A1 (en) * 2002-01-03 2004-12-09 Harman Jayden David Fluid flow controller
US20050269458A1 (en) * 2002-01-03 2005-12-08 Harman Jayden D Vortex ring generator
US20060102239A1 (en) * 2003-07-02 2006-05-18 Pax Scientific, Inc. Fluid flow control device
US20060263201A1 (en) * 2003-11-04 2006-11-23 Harman Jayden D Fluid circulation system
US20060275131A1 (en) * 2005-06-06 2006-12-07 Duffy Electric Boat Co. Propeller
US20070003414A1 (en) * 2004-01-30 2007-01-04 Pax Scientific, Inc. Housing for a centrifugal fan, pump, or turbine
US20070025846A1 (en) * 2004-01-30 2007-02-01 Pax Scientific, Inc. Vortical flow rotor
US20080302809A1 (en) * 2005-06-06 2008-12-11 Marshall Duffield Waterproof storage unit
US20090308472A1 (en) * 2008-06-15 2009-12-17 Jayden David Harman Swirl Inducer
US8328522B2 (en) 2006-09-29 2012-12-11 Pax Scientific, Inc. Axial flow fan

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US229270A (en) * 1880-06-29 perkins
GB190215254A (en) * 1902-07-08 1903-06-25 Johannes Peter Friedri Thomsen Improvements relating to Ships' Screw-propellers
US736137A (en) * 1902-11-24 1903-08-11 Amos C J H Mcintosh Propeller.
US885174A (en) * 1906-09-22 1908-04-21 Frederick L Perkins Propeller-wheel.
US887156A (en) * 1907-10-07 1908-05-12 Louis J H Voss Propeller-wheel.
US1403729A (en) * 1919-07-21 1922-01-17 Balaguer Andres Propeller
CH100366A (en) * 1922-02-11 1923-07-16 Chem Ind Basel Process for the preparation of a 4-oxynaphthalene-1-aryl ketone.
US1540728A (en) * 1924-09-06 1925-06-02 William G G Weidinger Propeller
US1806345A (en) * 1929-03-19 1931-05-19 Ole G Halvorsen Screw propeller
US1857327A (en) * 1929-08-03 1932-05-10 John H Pilet Propeller
US1863238A (en) * 1930-07-10 1932-06-14 Callahan Joseph Jeremiah Propeller
US1964525A (en) * 1932-07-30 1934-06-26 Gen Electric Fan blade
US2306177A (en) * 1941-05-22 1942-12-22 Otto W Mattson Propeller blade
FR1059607A (en) * 1952-07-09 1954-03-26 Propeller allowing navigation in water congested with grass

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US229270A (en) * 1880-06-29 perkins
GB190215254A (en) * 1902-07-08 1903-06-25 Johannes Peter Friedri Thomsen Improvements relating to Ships' Screw-propellers
US736137A (en) * 1902-11-24 1903-08-11 Amos C J H Mcintosh Propeller.
US885174A (en) * 1906-09-22 1908-04-21 Frederick L Perkins Propeller-wheel.
US887156A (en) * 1907-10-07 1908-05-12 Louis J H Voss Propeller-wheel.
US1403729A (en) * 1919-07-21 1922-01-17 Balaguer Andres Propeller
CH100366A (en) * 1922-02-11 1923-07-16 Chem Ind Basel Process for the preparation of a 4-oxynaphthalene-1-aryl ketone.
US1540728A (en) * 1924-09-06 1925-06-02 William G G Weidinger Propeller
US1806345A (en) * 1929-03-19 1931-05-19 Ole G Halvorsen Screw propeller
US1857327A (en) * 1929-08-03 1932-05-10 John H Pilet Propeller
US1863238A (en) * 1930-07-10 1932-06-14 Callahan Joseph Jeremiah Propeller
US1964525A (en) * 1932-07-30 1934-06-26 Gen Electric Fan blade
US2306177A (en) * 1941-05-22 1942-12-22 Otto W Mattson Propeller blade
FR1059607A (en) * 1952-07-09 1954-03-26 Propeller allowing navigation in water congested with grass

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936228A (en) * 1974-05-08 1976-02-03 Symbol Paul P Boat Propeller
US4080099A (en) * 1976-05-02 1978-03-21 Brunswick Corporation Propeller
US4604193A (en) * 1983-03-25 1986-08-05 E Et M Lamort S.A. Method and apparatus for sorting out a mixture of paper pulp and contaminants
FR2583709A1 (en) * 1985-06-25 1986-12-26 Maximov Vadim Propulsive helix
US4775297A (en) * 1986-03-12 1988-10-04 Klein, Schanzlin & Becker Aktiengesellschaft Non-clogging impeller for use in axial and mixed-flow centrifugal pumps
US5352093A (en) * 1989-07-24 1994-10-04 Hannon R Douglas Weedless propeller
US5681146A (en) * 1996-10-04 1997-10-28 Future Sea Farms Inc. Low head pumping system for fish farms
EP1238185A1 (en) * 1999-11-25 2002-09-11 Jayden David Harman A single or multi-bladed rotor
US6702552B1 (en) * 1999-11-25 2004-03-09 Jayden David Harman Impeller having blade(s) conforming to the golden section of a logarithmic curve
EP1238185A4 (en) * 1999-11-25 2004-10-20 Jayden David Harman A single or multi-bladed rotor
US7673834B2 (en) 2002-01-03 2010-03-09 Pax Streamline, Inc. Vortex ring generator
US20040244853A1 (en) * 2002-01-03 2004-12-09 Harman Jayden David Fluid flow controller
US20050269458A1 (en) * 2002-01-03 2005-12-08 Harman Jayden D Vortex ring generator
US7644804B2 (en) 2002-01-03 2010-01-12 Pax Streamline, Inc. Sound attenuator
US7096934B2 (en) 2002-01-03 2006-08-29 Pax Scientific, Inc. Heat exchanger
US20060249283A1 (en) * 2002-01-03 2006-11-09 Pax Scientific, Inc. Heat exchanger
US7766279B2 (en) 2002-01-03 2010-08-03 NewPax, Inc. Vortex ring generator
US8733497B2 (en) 2002-01-03 2014-05-27 Pax Scientific, Inc. Fluid flow controller
US7934686B2 (en) 2002-01-03 2011-05-03 Caitin, Inc. Reducing drag on a mobile body
US20110011463A1 (en) * 2002-01-03 2011-01-20 Jayden David Harman Reducing drag on a mobile body
US7287580B2 (en) 2002-01-03 2007-10-30 Pax Scientific, Inc. Heat exchanger
US20080023188A1 (en) * 2002-01-03 2008-01-31 Harman Jayden D Heat Exchanger
US20080041474A1 (en) * 2002-01-03 2008-02-21 Harman Jayden D Fluid Flow Controller
US20040238163A1 (en) * 2002-01-03 2004-12-02 Harman Jayden David Heat exchanger
US20080265101A1 (en) * 2002-01-03 2008-10-30 Pax Scientific, Inc. Vortex ring generator
US7980271B2 (en) 2002-01-03 2011-07-19 Caitin, Inc. Fluid flow controller
US8381870B2 (en) 2002-01-03 2013-02-26 Pax Scientific, Inc. Fluid flow controller
US7814967B2 (en) 2002-01-03 2010-10-19 New Pax, Inc. Heat exchanger
US8631827B2 (en) 2003-07-02 2014-01-21 Pax Scientific, Inc. Fluid flow control device
US7802583B2 (en) 2003-07-02 2010-09-28 New Pax, Inc. Fluid flow control device
US20060102239A1 (en) * 2003-07-02 2006-05-18 Pax Scientific, Inc. Fluid flow control device
US20060263201A1 (en) * 2003-11-04 2006-11-23 Harman Jayden D Fluid circulation system
US7862302B2 (en) 2003-11-04 2011-01-04 Pax Scientific, Inc. Fluid circulation system
US7832984B2 (en) 2004-01-30 2010-11-16 Caitin, Inc. Housing for a centrifugal fan, pump, or turbine
US7488151B2 (en) 2004-01-30 2009-02-10 Pax Streamline, Inc. Vortical flow rotor
US20090035132A1 (en) * 2004-01-30 2009-02-05 Pax Streamline, Inc. Housing for a centrifugal fan, pump, or turbine
US20070003414A1 (en) * 2004-01-30 2007-01-04 Pax Scientific, Inc. Housing for a centrifugal fan, pump, or turbine
US20070025846A1 (en) * 2004-01-30 2007-02-01 Pax Scientific, Inc. Vortical flow rotor
US7416385B2 (en) 2004-01-30 2008-08-26 Pax Streamline, Inc. Housing for a centrifugal fan, pump, or turbine
US10190310B2 (en) 2005-06-06 2019-01-29 Duffield Marine, Inc. Waterproof storage unit
US7806661B2 (en) 2005-06-06 2010-10-05 Duffield Marine, Inc. Propeller
US20080302809A1 (en) * 2005-06-06 2008-12-11 Marshall Duffield Waterproof storage unit
US20080267782A1 (en) * 2005-06-06 2008-10-30 Marshall Duffield Propeller
US20060275131A1 (en) * 2005-06-06 2006-12-07 Duffy Electric Boat Co. Propeller
US20110203199A1 (en) * 2005-06-06 2011-08-25 Marshall Duffield Waterproof storage unit
US8328522B2 (en) 2006-09-29 2012-12-11 Pax Scientific, Inc. Axial flow fan
US20090308472A1 (en) * 2008-06-15 2009-12-17 Jayden David Harman Swirl Inducer

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