Shock-absorbing frame structure for bicycle

Claim 1

A shock-absorbing frame structure for bicycle comprising: a front frame unit, said front frame unit comprising a head tube, a down tube having a front end connected to said head tube and a rear end, a seat tube having a bottom end connected to the rear end of said down tube and forming with the rear end of said down tube a bottom bracket and a top end holding a seat back, a top tube connected between a middle part of said down tube and a middle part of said seat tube, a bottom lug backwardly extended from said bottom bracket, a seat pillar disposed near the top end of said seat tube for holding the stem of a saddle, and a back lug formed integral with said seat tube on the middle at a back side; a bottom forks unit pivoted to said front frame unit, said bottom forks unit comprising two bottom forks, and a connector connected between said bottom forks at a front side and pivoted to the bottom lug at the bottom bracket of said front frame unit, a cross tube connected between said bottom forks on the middle, an upward lug formed integral with said cross tube, and an arched frame rod bridging said bottom forks at a rear end for the mounting of a luggage-carrier and rear fender; and shock-absorbing means coupled between the upward lug of said bottom forks and the back lug at said seat tube.