Patent ID: 6241565
Filing Date: 2001-06-05
Classification: A63B,B63H,F16H

Abstract:
A boat comprising:a) a first shaft for receiving a first input force;b) a second shaft for receiving a second input force;c) a first helical drive mechanism connected to said first shaft;d) a second helical drive mechanism connected to said second shaft;e) a power transmission mechanism coupled to said first and second helical drive mechanisms for driving said boat;f) a seat, wherein said first and second helical drive mechanisms are arranged in front of and substantially below said seat;g) a pontoon; andh) a steering mechanism, wherein said steering mechanism is controlled by a steering handle;wherein said first helical drive mechanism comprises:a) a first helical screw;b) a first slider connected to said first shaft and slidably engaged with said first helical screw, wherein said first slider includes:1) a first hole through which said first helical screw passes;2) first rollers contacting said first screw; andc) wherein a turn rate of said first helical screw varies;d) a first one-way roller clutch connected to a first end of said first helical screw;e) a first pinion gear connected to said first one-way roller clutch; andwherein said second helical drive mechanism comprises:a) a second helical screw;b) a second slider connected to said second shaft and slidably engaged with said second helical screw, wherein said second slider includes:1) a second hole through which said second helical screw passes; and2) second rollers contacting said second screw;c) wherein a turn rate of said second helical screw varies;d) a second one-way roller clutch connected to a first end of said second helical screw; ande) a second pinion gear connected to said second one-way roller clutch;wherein said power transmission mechanism comprises:a) an output gear meshed with said first and second pinion gears;b) a drive line having a first and a second end, wherein said first end of said drive line is connected to said output gear; andc) a water propeller connected to said second end of said drive line.