CA1095338A - Marine propulsion device including propeller protection means - Google Patents
Marine propulsion device including propeller protection meansInfo
- Publication number
- CA1095338A CA1095338A CA340,215A CA340215A CA1095338A CA 1095338 A CA1095338 A CA 1095338A CA 340215 A CA340215 A CA 340215A CA 1095338 A CA1095338 A CA 1095338A
- Authority
- CA
- Canada
- Prior art keywords
- gear case
- propeller
- propulsion device
- marine propulsion
- extending
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Abstract
Disclosed herein is a marine propulsion device including a lower unit having a gear case, a laterally extending anti-cavitation plate extending above a propeller carried on a propeller shaft rotatably mounted in the gear case, and a pair of generally flat side fins, each of which has a laterally extending trailing edge located wholly forwardly of the propeller and which either extend laterally in coplanar relationship from the opposite sides of the gear case, extend laterally in coplanar relationship from the opposite sides of the lower unit at a location between the anti-cavitation plate and the gear case, extend outwardly and downwardly in an angular relationship from the opposite sides of the gear case, or extend laterally in coplanar relationship from the opposite sides of the lower end portion of a vertical fin extending downwardly from the gear case.
Description
33~31 TITLE
MARINE PROPULSION DEVICE INCLUDING
PROPELLER PP~OTECTION MEANS
INVENTOR
Ralph S. Evinrude RELATED APPLICATION
This application is a division o~ Canadian applicatlon Serial No. 284,351 filecl August 9, 1977.
BACKGROUND OF THE INVENTION
The invention relates to marine propulsion devices such as outboard motors and stern drive units and, mor~ par~icularly, to such marine propulsion devices including means ~or protecting the propeller against engagement with underwater objects.
Various guard arrangments have been proposed to protect the propeller of mari.ne propulsion devices, such as outboard motors and stern drive units, against damage by floating or submerged objects such as drift-wood and other debris, Prior art propeller guard arrangements typically are quite expensiv~, are limited somewhat to a particular propeller size or shape and/or tend to affect propeller performance. Examples of prior propeller guard constructions are disclosed in the U.S. Modin Patent 1,869,977 issued August 2, 1932, the U.S. Brown Patent 2,894,447 issued July 14, 1959 and ~he Canadian Liaaen Patent 509J 171 issued January 18, 1965.
SU~MARY OF THE INV~NTION
The invention provides a marine propulsion device including a lower unit including a gear case normally submerged in water, a propeller shaft rotatably ;i3~8 mounted in the gear case for rotation about an axis and carrying a propeller, and a pair of gneerally flat fins affixed on and extendîng outwardly and downwardly from the opposite sides of the gear case at an angular relationship to each other, each of the fins having a laterally extending trailing edge located wholly forwardly of the propeller.
In one embodiment of the invention, ~.he gear case has a forward end7 and each of the side fins includes a generally straight outermost edge extending ~orwardly from the trailing edge and generally parallel to the propeller shaft axis, and a leading edge extending at an incline outwardly and rearwardly from adjacent the gear case forward end toward the outermost edge.
In one embodiment of the invention, the leading edge includes a convexly curved portion smoothly merging with the outermost edge.
In one embodiment of the invention, the outermost edges of the side fins extend laterally to a location generally corresponding to the peripheral path of ~he propeller.
Other features and advantages of the embodiments of the invention will become apparent upon reviewing the following detailed description, the drawings and the appended claims.
BRIRF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of an outboard motor embodying various of the features of the invention.
Fig. 2 is an enlarged sectional view taken along line 2-2 in Fig. 1.
, .... . :
Fig. 3 is an enlarged, fragmentary view of the lower portion of khe outboard motor shown in Fig.
1, shown wikh the propeller removed.
Fig. ~ is a view similar t:o Fig. 3 showing a modified side fill construction.
Fig. 5 is a view similar t;o Fig. 3 showing another modified side -fin construct;on.
Fig. 6 is a view similar l:o Fig. 3 showing s~ill another modi~ied side fin cons-truction.
Before explaining the embodiments of the in~ention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following description or illustrated in the drawing. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is ~or the purposes of description and should not be regarded as limiting.
DESGRIPTION OF TH~ PREFERRED EMBODIMENTS
Illustrated in the drawing is an outboard motor 10 including a propulsion unit 12 which is dirigible about a generally uprîght swivel post 14 carried by a transom bracket 16 which is mountable on the transom of a boat. ~he propulsion unit 12 includes a power head 20 which houses an engine ~not shown~ and is carried on a lower unit 22 having a drive sha~t housing 24 rigidly supporting the power head 20. The lower unik 22 includes an enlarged, streamlined or torpedo-shaped gear case 26 ,, . .
3~3 which is rigidly attached to the lower end of the drlve shaft housing 24 via a streamlined strut 27. The strut 27 has a curved leading edge or sur~ace 28 ancl a more pointed trailing edge or surface 29 (Fig. 2~.
Rotatably mounted in the gear case 26 for rotation about an axially extending axis 30 is a propeller sha:ft 32 which carries a propeller 34, for common rotation therewith, rearwardly o the aft end 36 of the gear case 26. The propeller shaft 32 is drivingly connected to a drive shaft 33 which is rotatably supported in the drive shaft housing 24 and is drivingly connected to the engine in the usual manner.
E~tending laterally from the strut 27 above the gear case 26 and above the propeller 34 is a horizon-tal anti-cavltation plate 38 which extends rearwardly over the propeller 34. The anti-cavitation plate 38 is arranged to restrain the downward flow o~ air along the sides of the lower unit 22, particularly along the sides of the strut 27, and thereby retain water beneath the anti-cavitation plate 38 in a "solid" condition.
The lower portion of the lower unit 22, including the anti-cavitation plate 38, the gear case 26, and other components located below the anti-cavitation plate, normally is submerged in water when the boat is being propelled. The engine exhaust gases can be discharged under water through a discharge snout 40 extending rearwardly at an angle from the strut 27 beneath the anti-ca~i-tation plate 38 and connected in communication with the interior of the drive shaft housing 24 as shown or discharged through a passage ~not shown~ within the propeller h~ib 42.
. - . ;
~ 533~
Exkending downwardly from the gear case 26 and -forwardly of the propell.er 34 is a vertical :Ein or s~eg 44 which is arranged to protect the propeller 34 against damage by objects in the water passing beneath the boat. The trailing surace or edge 46 of the skeg 44 is located -for~ardly of the propeller 34 and the leading surface or edge 48 of the skeg 44 is inclined downwardly and rearwardly from the forward end 49 of the gear case 26.
Additional means is provided ~or protecting the propeller 34 against engagement with underwater objects. More specifically, in the construction illu-strated in Figs. 1 3, such propeller protection means comprises a pair of generally flat, horizontally extending side ins 50 and 52 which are af~ixed on and extend laterally in substantially coplanar relationship from the opposite sides of the gear case 26 at or about the centerline or rotational axis 30 of the propeller shaft 32. In the specific construction illustrated, the gear case 26 has an upper portion 54 and a lower portion 56 which are suitably fastened together at a joint 57 located at the centerline or rota~ional. axis 30 of the propeller shaft 32. The side fins 50 and 52 are disposed JUSt below the joint 57 and are cast as an integral part of the lower gear case portion 56.
As best shown in Fig. 2, each of ~he side fins 50 and 52 have a laterally extending trailing edge 58 located wholly forwardly of the propeller 34, a generally straight outermost edge 60 extending ~orwardly from the trailing edge 58 in generally parallel rela~ion ~5--;33~
to -the centerline or rotational axis 30 of the propeller shaft 32, and a leading edge 62 e~tencling at an incline rearwardly and outward:Ly from a locclti.on adjacent the forward end 49 of the gear case 26 toward the outermost edge 60. The trailing edges can extend forwardly at a small an~le (e.g., 1) with respect to a plane intersect-ing and extendi.ng perpendicularly to the cneterline or rotational axis 30 of the propeller shaft 32. Each leading edge 62 preferably includes a convexly curved portion 64 which merges smoothly with the forward end portion of the outermost edge 60. The forward ends of the leading edges 62 can merge smoothly with the curved outer surface of the nose or forward end 49 of the gear case 26 as shown or can be spaced rearwardly from ~he forward end of the gear case.
With this arrangement, the side fins 50 and 52 not only serve as guards for deflecting objects submerged in the water away ~rom the propeller as the boat is propelled forwardly, but for some reason not fully understood at this time, have been found to reduce the tendency for the propeller 34 to cavitate or ventilate. In addition> termination of the trailing edges of the fins wholly forwardly of the propeller avoids interference with the propeller wash. The overall width of the side fins 50 and 52 preferably approximate, but can be slightly less ~han, the outside diameter of the propeller 34. That is, the outermost edges 60 extend to a lateral position generally corres-pondin~ to the peripheral path of the propeller 34.
Further, since the trailing edges 58 of the side fins -~ 3~
50 and 52 terminate forwardly of the propeller 34, a variety of propellers having different blade sl~es and shapes can be used Eor any gîven propulsion unit.
Figs 4 through 6, illustrate alternate con-structions Eor the side Eins. Components constructed in the same general manner as the embodiment illustrated in Figs. 1-3 have been assigned common reference numerals.
In the alternate construction illustrated in Fig. 4 the side fins 66 and 68 extend laterally in sub-stantially coplanar relationship from the opposite sides of the strut 27 at a location between the anti-cavi~ation plate 38 and ~he gear case 26, preferably immediately above the enlarged portion of the gear case 26 or at a location on the lower unit above the gear case and beneath the anti-cavitation plate and within an imaginary extension parallel to the propeller aigs of the periphery o~ the path of propeller rotation.
The laterally extending ~railing edges 58a of the side fins 66 and 68 are located forwardly of the propeller 34. The outermost edges 60a, the leading edges 62a, and the curved portions 6~a are arranged in the same general manner as in the embodiment illustrated in Figs. 1-3. The forward ends of the leading edges 62a can be spaced rearwardly from the leading surface or edge 28 of the strut 27 as shown or can merge smoothly with the curved leading surface or edge 28 o~ the strut 27.
In the alternate construction illustrated in Fig. 5, a vertical fin or skeg is omitted and the side fins 70 and 72 extend outwardly and downwardly :Erom the "
. ~ : , , . ;,- ,~
opposite sides of the gear case 26 at an angular relation-ship to each other, and pre~erably from a location on the lower portion 56 o the gear case 26 below the centerline or rotational axis 30 of the propeller shaft 32. The laterally extending trailing edges 58b oE the side fins 70 and 72 are located forwardly of the propeller 34. The outermost edges 60b, the leading edges 62b, and the curved portions 6~ are arranged in the same general manner as the embodiment illustrated in Figs.
1-3, except the side fins 70 and 72 are slightly longer so that the outermost edges 60b extend laterally to a location generally corresponding to the peripheral path of the propeller 34.
As with the embodiment illustrated in Fig. 4, the forward ends of the leading edges 62b can be spaced rearwardly from the forward end of the gear case 26 as shown or can merge smoothly with the curved outer surface of the nose or forward end of the gear case 26.
In the alterna~e construction illustrated in Fig. 6, generally flat side fins 74 and 76 are affixed on the lower portion o~ the vertical fin or skeg 44 and extend laterally from the opposite sides of the skeg in substantially coplanar relationship. The lat~rally extending trailing edges 58c of the side fins 74 and 76 are located forwardly of the propeller and can be generally co-terminus with the trailing surface or edge 46 of the skeg 4~. The outermost edges 60c, the leading edges ~2c, and the curved portions 64c are arranged in the sa~e general manner as in the embodiment illustrated in Figs. 1 3. The lowermost surfaces of the s:ide fins . ; , ,::
... . .. ..
33~
74 and 76 can be generally coplanar with the lowermost edge or surface of the skeg 44 with the :Eorward ends o:E
the leading edges 62c being generally co-terminus with the leading surface or edge 48 of the skeg 44. If desired, the side Eins 74 and 76 can be affixed on the skeg 44 at a location intermecliate the lowermost edge or surface thereof and the gear case 26 and the forward ends of the leading edges 62 can be spaced rearwardly from the leading surface or edge 48 of the skeg 44.
Various Eeatures oE the invention are set forth in the following claims:
_g_
MARINE PROPULSION DEVICE INCLUDING
PROPELLER PP~OTECTION MEANS
INVENTOR
Ralph S. Evinrude RELATED APPLICATION
This application is a division o~ Canadian applicatlon Serial No. 284,351 filecl August 9, 1977.
BACKGROUND OF THE INVENTION
The invention relates to marine propulsion devices such as outboard motors and stern drive units and, mor~ par~icularly, to such marine propulsion devices including means ~or protecting the propeller against engagement with underwater objects.
Various guard arrangments have been proposed to protect the propeller of mari.ne propulsion devices, such as outboard motors and stern drive units, against damage by floating or submerged objects such as drift-wood and other debris, Prior art propeller guard arrangements typically are quite expensiv~, are limited somewhat to a particular propeller size or shape and/or tend to affect propeller performance. Examples of prior propeller guard constructions are disclosed in the U.S. Modin Patent 1,869,977 issued August 2, 1932, the U.S. Brown Patent 2,894,447 issued July 14, 1959 and ~he Canadian Liaaen Patent 509J 171 issued January 18, 1965.
SU~MARY OF THE INV~NTION
The invention provides a marine propulsion device including a lower unit including a gear case normally submerged in water, a propeller shaft rotatably ;i3~8 mounted in the gear case for rotation about an axis and carrying a propeller, and a pair of gneerally flat fins affixed on and extendîng outwardly and downwardly from the opposite sides of the gear case at an angular relationship to each other, each of the fins having a laterally extending trailing edge located wholly forwardly of the propeller.
In one embodiment of the invention, ~.he gear case has a forward end7 and each of the side fins includes a generally straight outermost edge extending ~orwardly from the trailing edge and generally parallel to the propeller shaft axis, and a leading edge extending at an incline outwardly and rearwardly from adjacent the gear case forward end toward the outermost edge.
In one embodiment of the invention, the leading edge includes a convexly curved portion smoothly merging with the outermost edge.
In one embodiment of the invention, the outermost edges of the side fins extend laterally to a location generally corresponding to the peripheral path of ~he propeller.
Other features and advantages of the embodiments of the invention will become apparent upon reviewing the following detailed description, the drawings and the appended claims.
BRIRF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of an outboard motor embodying various of the features of the invention.
Fig. 2 is an enlarged sectional view taken along line 2-2 in Fig. 1.
, .... . :
Fig. 3 is an enlarged, fragmentary view of the lower portion of khe outboard motor shown in Fig.
1, shown wikh the propeller removed.
Fig. ~ is a view similar t:o Fig. 3 showing a modified side fill construction.
Fig. 5 is a view similar t;o Fig. 3 showing another modified side -fin construct;on.
Fig. 6 is a view similar l:o Fig. 3 showing s~ill another modi~ied side fin cons-truction.
Before explaining the embodiments of the in~ention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following description or illustrated in the drawing. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is ~or the purposes of description and should not be regarded as limiting.
DESGRIPTION OF TH~ PREFERRED EMBODIMENTS
Illustrated in the drawing is an outboard motor 10 including a propulsion unit 12 which is dirigible about a generally uprîght swivel post 14 carried by a transom bracket 16 which is mountable on the transom of a boat. ~he propulsion unit 12 includes a power head 20 which houses an engine ~not shown~ and is carried on a lower unit 22 having a drive sha~t housing 24 rigidly supporting the power head 20. The lower unik 22 includes an enlarged, streamlined or torpedo-shaped gear case 26 ,, . .
3~3 which is rigidly attached to the lower end of the drlve shaft housing 24 via a streamlined strut 27. The strut 27 has a curved leading edge or sur~ace 28 ancl a more pointed trailing edge or surface 29 (Fig. 2~.
Rotatably mounted in the gear case 26 for rotation about an axially extending axis 30 is a propeller sha:ft 32 which carries a propeller 34, for common rotation therewith, rearwardly o the aft end 36 of the gear case 26. The propeller shaft 32 is drivingly connected to a drive shaft 33 which is rotatably supported in the drive shaft housing 24 and is drivingly connected to the engine in the usual manner.
E~tending laterally from the strut 27 above the gear case 26 and above the propeller 34 is a horizon-tal anti-cavltation plate 38 which extends rearwardly over the propeller 34. The anti-cavitation plate 38 is arranged to restrain the downward flow o~ air along the sides of the lower unit 22, particularly along the sides of the strut 27, and thereby retain water beneath the anti-cavitation plate 38 in a "solid" condition.
The lower portion of the lower unit 22, including the anti-cavitation plate 38, the gear case 26, and other components located below the anti-cavitation plate, normally is submerged in water when the boat is being propelled. The engine exhaust gases can be discharged under water through a discharge snout 40 extending rearwardly at an angle from the strut 27 beneath the anti-ca~i-tation plate 38 and connected in communication with the interior of the drive shaft housing 24 as shown or discharged through a passage ~not shown~ within the propeller h~ib 42.
. - . ;
~ 533~
Exkending downwardly from the gear case 26 and -forwardly of the propell.er 34 is a vertical :Ein or s~eg 44 which is arranged to protect the propeller 34 against damage by objects in the water passing beneath the boat. The trailing surace or edge 46 of the skeg 44 is located -for~ardly of the propeller 34 and the leading surface or edge 48 of the skeg 44 is inclined downwardly and rearwardly from the forward end 49 of the gear case 26.
Additional means is provided ~or protecting the propeller 34 against engagement with underwater objects. More specifically, in the construction illu-strated in Figs. 1 3, such propeller protection means comprises a pair of generally flat, horizontally extending side ins 50 and 52 which are af~ixed on and extend laterally in substantially coplanar relationship from the opposite sides of the gear case 26 at or about the centerline or rotational axis 30 of the propeller shaft 32. In the specific construction illustrated, the gear case 26 has an upper portion 54 and a lower portion 56 which are suitably fastened together at a joint 57 located at the centerline or rota~ional. axis 30 of the propeller shaft 32. The side fins 50 and 52 are disposed JUSt below the joint 57 and are cast as an integral part of the lower gear case portion 56.
As best shown in Fig. 2, each of ~he side fins 50 and 52 have a laterally extending trailing edge 58 located wholly forwardly of the propeller 34, a generally straight outermost edge 60 extending ~orwardly from the trailing edge 58 in generally parallel rela~ion ~5--;33~
to -the centerline or rotational axis 30 of the propeller shaft 32, and a leading edge 62 e~tencling at an incline rearwardly and outward:Ly from a locclti.on adjacent the forward end 49 of the gear case 26 toward the outermost edge 60. The trailing edges can extend forwardly at a small an~le (e.g., 1) with respect to a plane intersect-ing and extendi.ng perpendicularly to the cneterline or rotational axis 30 of the propeller shaft 32. Each leading edge 62 preferably includes a convexly curved portion 64 which merges smoothly with the forward end portion of the outermost edge 60. The forward ends of the leading edges 62 can merge smoothly with the curved outer surface of the nose or forward end 49 of the gear case 26 as shown or can be spaced rearwardly from ~he forward end of the gear case.
With this arrangement, the side fins 50 and 52 not only serve as guards for deflecting objects submerged in the water away ~rom the propeller as the boat is propelled forwardly, but for some reason not fully understood at this time, have been found to reduce the tendency for the propeller 34 to cavitate or ventilate. In addition> termination of the trailing edges of the fins wholly forwardly of the propeller avoids interference with the propeller wash. The overall width of the side fins 50 and 52 preferably approximate, but can be slightly less ~han, the outside diameter of the propeller 34. That is, the outermost edges 60 extend to a lateral position generally corres-pondin~ to the peripheral path of the propeller 34.
Further, since the trailing edges 58 of the side fins -~ 3~
50 and 52 terminate forwardly of the propeller 34, a variety of propellers having different blade sl~es and shapes can be used Eor any gîven propulsion unit.
Figs 4 through 6, illustrate alternate con-structions Eor the side Eins. Components constructed in the same general manner as the embodiment illustrated in Figs. 1-3 have been assigned common reference numerals.
In the alternate construction illustrated in Fig. 4 the side fins 66 and 68 extend laterally in sub-stantially coplanar relationship from the opposite sides of the strut 27 at a location between the anti-cavi~ation plate 38 and ~he gear case 26, preferably immediately above the enlarged portion of the gear case 26 or at a location on the lower unit above the gear case and beneath the anti-cavitation plate and within an imaginary extension parallel to the propeller aigs of the periphery o~ the path of propeller rotation.
The laterally extending ~railing edges 58a of the side fins 66 and 68 are located forwardly of the propeller 34. The outermost edges 60a, the leading edges 62a, and the curved portions 6~a are arranged in the same general manner as in the embodiment illustrated in Figs. 1-3. The forward ends of the leading edges 62a can be spaced rearwardly from the leading surface or edge 28 of the strut 27 as shown or can merge smoothly with the curved leading surface or edge 28 o~ the strut 27.
In the alternate construction illustrated in Fig. 5, a vertical fin or skeg is omitted and the side fins 70 and 72 extend outwardly and downwardly :Erom the "
. ~ : , , . ;,- ,~
opposite sides of the gear case 26 at an angular relation-ship to each other, and pre~erably from a location on the lower portion 56 o the gear case 26 below the centerline or rotational axis 30 of the propeller shaft 32. The laterally extending trailing edges 58b oE the side fins 70 and 72 are located forwardly of the propeller 34. The outermost edges 60b, the leading edges 62b, and the curved portions 6~ are arranged in the same general manner as the embodiment illustrated in Figs.
1-3, except the side fins 70 and 72 are slightly longer so that the outermost edges 60b extend laterally to a location generally corresponding to the peripheral path of the propeller 34.
As with the embodiment illustrated in Fig. 4, the forward ends of the leading edges 62b can be spaced rearwardly from the forward end of the gear case 26 as shown or can merge smoothly with the curved outer surface of the nose or forward end of the gear case 26.
In the alterna~e construction illustrated in Fig. 6, generally flat side fins 74 and 76 are affixed on the lower portion o~ the vertical fin or skeg 44 and extend laterally from the opposite sides of the skeg in substantially coplanar relationship. The lat~rally extending trailing edges 58c of the side fins 74 and 76 are located forwardly of the propeller and can be generally co-terminus with the trailing surface or edge 46 of the skeg 4~. The outermost edges 60c, the leading edges ~2c, and the curved portions 64c are arranged in the sa~e general manner as in the embodiment illustrated in Figs. 1 3. The lowermost surfaces of the s:ide fins . ; , ,::
... . .. ..
33~
74 and 76 can be generally coplanar with the lowermost edge or surface of the skeg 44 with the :Eorward ends o:E
the leading edges 62c being generally co-terminus with the leading surface or edge 48 of the skeg 44. If desired, the side Eins 74 and 76 can be affixed on the skeg 44 at a location intermecliate the lowermost edge or surface thereof and the gear case 26 and the forward ends of the leading edges 62 can be spaced rearwardly from the leading surface or edge 48 of the skeg 44.
Various Eeatures oE the invention are set forth in the following claims:
_g_
Claims (8)
1. A marine propulsion device comprising a lower unit including a gear case normally submerged in water, a propeller shaft rotatably mounted in said gear case for rotation about an axis and carrying a propeller, and a pair of generally flat fins affixed on and extending outwardly and downwardly from the opposite sides of said gear case at an angular relationship to each other, each of said fins having a laterally extending trailing edge located wholly forwardly of said propeller.
2. A marine propulsion device according to Claim 1 wherein said gear case has a forward end, and wherein each of said side fins includes a generally straight outermost edge extending forwardly from said trailing edge and generally parallel to said propeller shaft axis, and a leading edge extending at an incline outwardly and rearwardly from adjacent said gear case forward end toward said outermost edge.
3. A marine propulsion device according to Claim 2 wherein said leading edge includes a convexly curved portion smoothly mergining with said outermost edge.
4. A marine propulsion device according to Claim 2 wherein said outermost edges of said side fins extend laterally to a location generally corresponding to the peripheral path of said propeller.
5. A marine propulsion device comprising a lower unit including a gear case normally submerged in water, a propeller shaft rotatably mounted in said gear case for rotation about an axis and carrying a propeller, and a pair of generally flat fins affixed on and extending outwardly and downwardly from the opposite sides of said gear case at an angular relationship to each other and in generally radial relation to the axis of said propeller shaft, each of said fins having a laterally extending trailing edge located wholly forwardly of said propeller.
6. A marine propulsion device according to Claim 5 wherein said gear case has a forward end, and wherein each of said side fins includes a generally straight outermost edge extending forwardly from said trailing edge and generally parallel to said propeller shaft axis, and a leading edge extending at an incline outwardly and rearwardly from adjacent said gear case forward end toward said outermost edge.
7. A marine propulsion device according to Claim 6 wherein said leading edge includes a convexly curved portion smoothly merging with said outermost edge.
8. A marine propulsion device according to Claim 6 wherein said outermost edges of said side fins extend laterally to a location generally corresponding to the peripheral path of said propeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA340,215A CA1095338A (en) | 1976-11-03 | 1979-11-20 | Marine propulsion device including propeller protection means |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/738,528 US4096819A (en) | 1976-11-03 | 1976-11-03 | Marine propulsion device including propeller protection means |
| US738,528 | 1976-11-03 | ||
| CA284,351A CA1078672A (en) | 1976-11-03 | 1977-08-09 | Marine propulsion device including propeller protection means |
| CA340,215A CA1095338A (en) | 1976-11-03 | 1979-11-20 | Marine propulsion device including propeller protection means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1095338A true CA1095338A (en) | 1981-02-10 |
Family
ID=27165216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA340,215A Expired CA1095338A (en) | 1976-11-03 | 1979-11-20 | Marine propulsion device including propeller protection means |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1095338A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4565533A (en) * | 1982-10-27 | 1986-01-21 | Springer Manfred H | Boat propeller guard |
-
1979
- 1979-11-20 CA CA340,215A patent/CA1095338A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4565533A (en) * | 1982-10-27 | 1986-01-21 | Springer Manfred H | Boat propeller guard |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |