MAQUINA PARA ABRIR GALERIAS O EXTRAER MINERALES

摘要

A mine drift advancing machine includes a cutting arm pivoted at its rear end to the machine chassis for movement about a horizontal axis and at its front end supporting a carrier which is pivoted to the arm for movement about a vertical axis. At least two horizontally spaced apart rocking levers are pivoted at their rear ends to the carrier for swinging about vertical axes and a lever drive is provided for swinging the levers simultaneously in the same directions. The forward end of each lever carrie at least one cutting tool which is rotatable about a generally vertical axis.