Marine propulsion – Oar or paddle
Patent
1989-01-03
1990-09-11
Basinger, Sherman
Marine propulsion
Oar or paddle
416 74, B63H 1604
Patent
active
049558390
ABSTRACT:
A resin and transfer molding technique is used to fabricate, in a unitary fashion, a synthetic oar that has as a core, polyurethane and a longitudinal rigid rectangular spline preferably sitka spruce which transverses orthogonally and extends along the longitudinal axis of the shaft of the oar, the shaft handle therefore and opposite paddle end being unitarily molded according to the resin transfer molding technique. Prior to such molding a green oar substructure is made of the shaft and handle on the one hand, and the paddle on the other hand where a multi-layer wrap of synthetic material is formed over the spline in relation to the shaft and in the paddle mold in relation to the paddle and the cavities are cores thereof filled with green polyurethane. The two components so formed, being the green paddle, and the green shaft, are merged together and further wraps of synthetic material overlaid. The enwrapped overlayed green oar is placed in the resin transfer mold wherein a thermo-setting resin is inserted, the mold elevated to a curing temperature, and the complete oar fabricated. On cooling it is removed and the outside surface finished as required.
REFERENCES:
patent: 4124670 (1978-11-01), Cecka et al.
patent: 4383955 (1983-05-01), Rubio et al.
patent: 4610633 (1986-09-01), Freudenberg
Materials Engineering, 1984 Top Twenty Award-Nov. 1984, pp. 40 and 41.
Modern Plastics, Mar. 1985, page No. unknown.
Thermal Expansion Transfer Molding-Tertm Inc., Jan. 31/1985, consisting of 4 pages.
Basinger Sherman
Big Creek Sports Ltd.
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