PORTABLE CANOE PROPULSION SYSTEM
A portable pedal driven propulsion device for a small watercraft in which power from crank operated pedals is transmitted to a pivotally mounted gearbox on the outside of the watercraft adjacent the operator. A longitudinal drive shaft is connected, at one end, to the gear box and, at the other end, to a propeller so that the drive shaft and propeller can be moved selectively between a raised inoperative position and a lowered operative position.
This invention relates to a portable propulsion device for use in a small watercraft such as a canoe. More particularly, this invention relates a portable pedal and seat device for driving an outboard propeller pivotally mounted alongside the canoe for movement between an operative position wherein the propeller is in the water and an inoperative position wherin the propeller is out of the water and the propeller drive shaft is in a plane parallel the gunwhale of the canoe.
BACKGROUND OF INVENTIONPedal operated watercraft, such as canoes, are well known in the art and there are numerous patents directed to specific features thereof. Such devices generally comprise a frame structure, with or without a seat, having a pedal crank and sprocket system connected, by way of a chain, to a drive shaft which drives, via a series of gears and pinions, a vertically mounted drive shaft at the stern of the watercraft which in turn drives a propeller mounted on a horizontal axis. Such devices are relatively complex and involve a long gear train which is inherently expensive. The rigidly mounted vertical shaft at the stern to drive the propeller implies that the propeller is at a fixed depth relative to the keel of the watercraft, and it is difficult, if not impossible, for a canoeist to turn around in a relatively unstable canoe to reach the vertically mounted drive shaft at the stern so as to raise the propeller out of the water when not in use or in shallow water. There is a need, therefore, for a simple pedal operated propulsion system in which the propeller can be raised or lowered easily by the canoeist without moving from his seat or even turning to face the rear of the canoe. Preferably, the canoeist should be seated as low as possible in the canoe for stability reasons and the pedal device should incorporate both the seat and the crank mechanism and should be simply placed across the gunwhales of the canoe without needing clamps, bolts or other devices to secure it in place.
OBJECT OF INVENTIONIt is an object of the present invention to provide a portable crank-operated, propeller driven, propulsion system for use in a canoe or other small watercraft, in which the propeller is mounted on a propeller shaft which can be raised to, or lowered from, a substantially horizontal position parallel to the gunwhale of the canoe to an operative position in which the propellor shaft is at an acute angle relative to the gunwhale and the propeller is at any selected depth in the water.
BRIEF STATEMENT OF INVENTIONBy one aspect of this invention there is provided a portable, pedal driven propulsion device, for use in a watercraft having gunwhales, comprising:
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- (a) a substantially quadrilateral frame adapted to be releasably mounted on the gunwhales of said watercraft;
- (b) operator seat means mounted on said quadrilateral frame;
- (c) pedal crank means mounted forwardly of, and depending from, said quadrilateral frame and operable by an operator sitting on said seat means;
- (d) a gear box pivotally mounted, on said quadrilateral frame so as to lie outboard of one of said gunwhales and forward of said operator seat means when in operative position;
- (e) means to transmit motive power generated by said pedal crank means to said gear box; and
- (f) longitudinal drive shaft means operatively connected at one end thereof to said gear box and, at a second end thereof, to a propeller means;
said gear box and drive shaft means being adapted to be pivoted, when mounted on said watercraft, about a horizontal transverse axis so as to raise said propeller means to an inoperable position wherein said drive shaft means is substantially parallel to said one gunwhale, and lower said propeller means to an operative position wherein said drive shaft means is at an acute angle relative to said gunwhale.
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It will be appreciated that many modifications may be made without departing from the spirit and scope of this invention as defined by the appended claims. For example, the conventional toothed sprockets 7, 9, 22 and 24 may, if desired be replaced with similarly conventional smooth pulley wheels with associated ribbed or plain rubber drive belts.
Claims
1. A portable, pedal driven propulsion device, for use in a watercraft having gunwhales, comprising:
- (a) a substantially quadrilateral frame adapted to be releasably mounted on the gunwhales of said watercraft;
- (b) operator seat means mounted on said quadrilateral frame;
- c) pedal crank means mounted forwardly of, and depending from, said quadrilateral frame and operable by an operator sitting on said seat means;
- (d) a gear box pivotally mounted, on said quadrilateral frame so as to lie outboard of one of said gunwhales and forward of said operator seat means when in operative position;
- (e) means to transmit motive power generated by said pedal crank means to said gear box, comprising first drive means operatively connected to a first end of a first transverse drive shaft, second drive means operatively connected to a second end of said first transverse drive shaft, a second transverse drive shaft means, including slideable means to selectively engage and disengage said second drive means and said gear box, operatively connected to said second drive means at a first end thereof and to said gear box at a second end thereof; and
- (f) longitudinal drive shaft means operatively connected at one end thereof to said gear box and, at a second end thereof, to a propeller means;
- said gear box and longitudinal drive shaft means being adapted to be pivoted, when mounted on said watercraft, about a horizontal transverse axis so as to raise said propeller means to an inoperable position wherein said drive shaft means is substantially parallel to said one gunwhale, and lower said propeller means to an operative position wherein said drive shaft means is at an acute angle relative to said gunwhale.
2. A propulsion device as claimed in claim 1, wherein said drive shaft is rotatably mounted within a longitudinal tube means.
3. A propulsion device as claimed in claim 2, including means to support said tube means, intermediate the ends thereof, in a selected one of said operative and inoperative positions.
4. (canceled)
5. (canceled)
6. A propulsion device as claimed in claim 1 wherein said second transverse drive shaft means is rotatably mounted in transverse tube means mounted on said quadrilateral frame.
7. A propulsion device as claimed in claim 6 wherein said second transverse drive shaft means includes first bevel gear means at said second end thereof.
8. A propulsion device as claimed in claim 7 wherein said longitudinal drive shaft means includes second bevel gear means at said one end thereof.
9. A propulsion device as claimed in claim 8 wherein said first and second bevel gear means are contained within said gear box and mounted at right angles to each other for meshing engagement.
10. A propulsion device as claimed in claim 9 when mounted on said watercraft.
11. A propulsion device as claimed in claim 10 wherein said watercraft is a canoe.
12. A propulsion device as claimed in claim 1 wherein said operator seat means is adjustably mounted on said quadrilateral frame.
13. A propulsion device as claimed in claim 1 wherein ssa+d said operator seat means is rigidly mounted on said quadrilateral frame.
14. A propulsion device as claimed in claim 1 wherein said first and second drive means comprise chain drive means.
Type: Application
Filed: Nov 28, 2003
Publication Date: Jun 2, 2005
Inventor: Reinhard Jackson (Bath)
Application Number: 10/722,399