Propulsion apparatus for watercraft
OwnerJoseph D Mareshinventor
Life of this patent
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Abstract
A watercraft propulsion apparatus includes an eccentric crank assembly operatively connected to a pair of fins adapted to sweep back and forth in a generally transverse direction relative to a longitudinal axis of the watercraft. The fins may be rotatable about a first axis coplanar to the longitudinal axis of the watercraft. A drive linkage assembly operatively connecting the eccentric crank assembly to the pair of fins imparts a torque force to oscillate the pair of fins. The oscillating fins provide a propulsive force to propel the watercraft longitudinally forward during both oscillating directions of the fins as they sweep back and forth.
Claims12
A watercraft propulsion apparatus, comprising:
- a) a frame fixedly secured to a hull of a watercraft, said frame including a base and a stanchion extending generally vertically from said base;
- b) a pair of arm members spaced apart from one another extending generally horizontally from proximate an upper distal of said stanchion;
- c) an eccentric crank disc rotatably supported by said pair of arm members;
- d) a drive linkage assembly interconnecting said eccentric crank disc to a pair of fins extending downwardly from said frame;
- and
- e) wherein rotational movement of said eccentric crank disc imparts a force to oscillate said pair of fins transversely to a center longitudinal axis of the watercraft.
A watercraft propulsion apparatus, comprising:
- a) a crank assembly;
- b) a drive linkage assembly;
- c) A pair of fins operable to provide a propulsive force to move a watercraft longitudinally forward;
- d) wherein said crank assembly includes a rotatable eccentric crank disc operatively connected to said pair of fins.
Dependencies are inferred from the claim text.