Patent ID: 9440701
Filing Date: 2016-09-13
CPC Classification: B62K

Claim Text:
1. A body frame for a bicycle, which is manufactured in such a way that multiple carbon sheets are laminated to a predetermined thickness so that a head tube, a top tube, a bottom tube, and a seat tube are integrated, and the laminated structure is heated and pressurized together with an epoxy resin, comprising: the top tube, the bottom tube and the seat tube having first, second, and third outer diameters, respectively, each of the first, second, and third outer diameters being constant along longitudinal directions of the top tube, the bottom tube and the seat tube, respectively, each of the first, second, and third outer diameters being in a range from 15 mm to 35 mm; and inner tubes made of a carbon material, the inner tubes being fixedly installed in a ¼ section with respect to a first direction from a front end to a rear end of the top tube, in a front ¼ section with respect to a second direction from a front end to a rear end of the bottom tube, and in a lower ¼ section with respect to a third direction from a bottom end to a top end of the seat tube, respectively.