Patent ID: 7048429

Claim:
A concrete mixer rotatably supporting a drum to a mounting frame and rotating said drum while using a driving motor so as to mix various kinds of materials in said drum, comprising: a vibration device fixed to at least said mounting frame; and a vibration transmitting means for transmitting a vibration of said vibration device to said drum is provided on said mounting frame, said vibration transmitting means comprising: a pair of arms integrally protruding from said mounting frame; rotation members rotatably supported by ends of said pair of arms respectively, said rotation members contacting said drum, wherein said drum has a cylindrical shape having an open end and a bottom portion, said drum including a plurality of agitating blades inside thereof, wherein said mounting frame has a bearing on a central part thereof in order to rotatably support a rotation shaft, said shaft being provided on the bottom portion of said drum in a protruding manner; and wherein said vibration device is fixed adjacent to said bearing.