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US 5,842,830 AGranted
Hollow shaft kayak paddle
AssigneeZuzu Paddle Company, Inc.
InventorPhilip Christopher Franznick
Life of this patent
Estimating the term…
Abstract
A kayak paddle with a hollow wooden shaft featuring reduced weight and improved strength. The shaft is formed from lineal segments which run the entire length of the paddle shaft and are joined to form a closed shaft structure. A helical twist can be introduced in the shaft to establish desired paddle "feather." The hollow shaft can be formed having a closed cell foam core wrapped with a reinforcing cloth, such as fiberglass to further increase the strength of the shaft.
Claims29
A kayak paddle comprising:
- an elongate hollow shaft having a first end, a second end and a length, said shaft being formed from at least two lineal segments in a side-to-side relationship to provide a substantially continuous outside surface and a hollow shaft interior;
- a first paddle blade, said first paddle blade being attached to said first shaft end;
- and
- a second paddle blade, said second paddle blade being attached to said second shaft end.
1 more element
A kayak paddle comprising:
- an elongate hollow shaft having a first end, a second end, a length and a center axis along said length, said shaft being formed from at least two lineal segments in a side-to-side relationship to provide a substantially continuous outside surface and a hollow shaft interior;
- a first paddle blade, said first paddle blade being attached to said first shaft end;
- and
- a second paddle blade, said second paddle blade being attached to said second shaft end
- wherein said first end is rotationally displaced about said center axis with respect said second end, whereby said first paddle blade is feathered with respect to said second paddle blade by said rotational displacement.
2 more elements
An elongate hollow shaft having a helical twist therein, said hollow shaft comprising:
- at least three lineal segments, each of said segments having a length and a substantially trapezoidal cross section defined by an exterior base, an interior base and two nonparallel legs, each of said two nonparallel legs and said length defining a surface for forming a mating relationship with said surface of another segment, said lineal segments being arranged in side-to-side relationship with each other so that said surfaces are substantially aligned when said lineal segments are joined to form said hollow shaft having a first end, a second end, and an interior, said first end being rotationally displaced with respect to said second end.
An elongate hollow shaft comprising:
- at least four lineal segments, each of said segments having a length and a substantially trapezoidal cross section defined by an exterior base, an interior base and two nonparallel legs, each of said two nonparallel legs and said length defining a surface for forming a mating relationship with said surface of another segment, said lineal segments being arranged in side-to-side relationship with each other so that said surfaces are substantially aligned when said lineal segments are joined to form said hollow shaft having an interior and an ovular cross section.
A paddle comprising:
- an elongate hollow shaft including at least four lineal segments, each of said segments having a length and a substantially trapezoidal cross section defined by an exterior base, an interior base and two nonparallel legs, each of said two nonparallel legs and said length defining a surface for forming a mating relationship with said surface of another segment, said lineal segments being arranged in side-to-side relationship with each other so that said surfaces are substantially aligned when said lineal segments are joined to form said hollow shaft having an ovular cross section, a first end, a second end, and an interior,
- at least one of a first paddle blade and a second paddle blade, said first paddle blade being attached to said first end and said second paddle blade being attached to said second end.
Dependencies are inferred from the claim text.