Ships – Boats – boat component – or attachment – Inflatable
Patent
1995-02-21
1996-07-16
Avila, Stephen
Ships
Boats, boat component, or attachment
Inflatable
114357, B63B 700
Patent
active
055356974
ABSTRACT:
A tube for a rubber boat which is provided at a periphery of the rubber boat and whose intended expanded configuration having a three-dimensional curve as a central line is a substantially cylindrical configuration. A fabricated configuration of the tube for the rubber boat is a substantially equilateral polygonal column configuration formed by preparing equilateral polygons which are the same as circumferential lengths of the intended expanded configuration in a plurality of cross-sections orthogonal to the central line, and for each of which distances from respective vertices thereof to the central line are equal, and by connecting corresponding sides of equilateral polygons of adjacent orthogonal cross-sections among the plurality of orthogonal cross-sections. For each equilateral polygon forming the substantially equilateral polygonal column configuration, a sum total of lengths of respective sides of any given equilateral polygon is substantially equal to a circumferential length of the intended expanded configuration in an orthogonal cross-section including the given equilateral polygon. Therefore, when the tube is expanded, a substantially cylindrical tube for a rubber boat can be obtained in which the substantially equilateral polygonal column configuration has substantially a same diameter as a diameter of an intended substantially cylindrical configuration.
REFERENCES:
patent: 2508304 (1950-05-01), Sturtevant
patent: 3030640 (1962-04-01), Gosman
patent: 3930274 (1976-01-01), Syfritt
Avila Stephen
Toyota Jidosha & Kabushiki Kaisha
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