Body frame for bicycle
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United States of America Patent
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-
Sep 13, 2016
Grant Date -
Dec 3, 2015
app pub date -
May 21, 2015
filing date -
May 27, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed is a frame body for a bicycle which is able to provide higher strength and reduce the weight of the body frame in such a way to use a carbon material even when the outer diameters of a top tube and a bottom tube are thinner same as the thickness of the tubes forming a classical type body frame. In the body frame for a bicycle, at least one tube among the top tube, the bottom tube and the seat tube is made of a carbon material outer tube of a pipe shape the diameter of which is same from one end to the other end, and an inner tube made of a carbon material in a tubular shape and having a cross section area smaller than the cross section area of the outer tube is fixedly installed in the inside of a predetermined section of the outer tube.
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