Disclosed herein is a frame body (100) 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 (110), a bottom tube (120), and a seat tube (130), etc. are thinner same as the thickness of the tubes forming the body frame in a classical type bicycle. In the body frame for a bicycle which includes the top tube (110), the bottom tube (120) and the seat tube (130), at least one tube among the top tube (110), the bottom tube (120) and the seat tube (130) 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 (300) 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 the whole sections or a predetermined section of the outer tube.
BODY FRAME FOR BICYCLE
FAHRRADRAHMEN
CADRE DE BICYCLETTE
14.11.2018
Patent
Elektronische Ressource
Englisch
IPC: | B62K Fahrräder , CYCLES |