Blades for paddles and oars
OwnerTakeshi Hagiharainventor
Life of this patent
Estimating the term…
Abstract
A blade for a paddle or an oar having a shaft and a paddling surface provided at a foremost end of the shaft, for enhancing paddling efficiency. The blade includes locking means provided on the paddling surface for locking water when the paddle or oar is operated with the shaft, the locking means comprising a plurality of circular, elliptical or polygonal hollows formed and arranged on the paddling surface in rows or in a grid pattern, each of the hollows having an area of 1/100 to 1/50 of an area of the paddling surface.
Claims15
A blade to be employed on a foremost end of a shaft of a paddle or oar, said blade comprising:
- a paddling surface to be forced through water during use of the paddle or oar;
- means in said paddling surface for locking water during use, said means comprising a plurality of recesses formed in said paddling surface;
- and
- each said recess extending only partly through the thickness of said blade, and each said recess having an area equal to 1/100 to 1/50 of the area of said paddling surface.
A blade as claimed in claim 9, wherein at least one said recess is elliptical.
Dependencies are inferred from the claim text.