Abstract: A drill pot for rotating a drill steel is supported at the front end portion of a drill boom that extends forwardly from a self-propelled frame. The drill boom raises the drill pot in a straight line to advance the rotating drill steel into the mine roof and drill a bore hole for the installation of a roof bolt. A drill guide carriage is supported at the front end portion of a drill guide boom that also extends forwardly from the machine frame. The drill guide boom is positioned in overlying relation with the drill boom and is raised to move the drill guide carriage in vertical alignment with the drill pot. A pair of drill guide members is pivotally connected to the drill guide carriage for movement into a closed drill guide position surrounding the drill steel.

Abstract: A horizontal deck extends forwardly from a self-propelled body portion. An elevating mechanism pivotally connects the deck to the body portion for vertical movement of the deck into and out of position on the mine floor. A mast-type roof drilling unit is mounted on the front of the deck and includes a vertically movable drill pot for advancing a rotating drill rod into the mine roof for drilling a bore hole therein. The deck is positioned on the mine floor during the drilling operation. During tramming of the body portion the deck is raised to an elevated position above the mine floor. A roof support assembly is supported by telescoping devices above the deck to provide overhead protection for the machine operator during the drilling and tramming operations. During drilling the roof support assembly is raised to abut the mine roof and support the mine roof above the operator on the deck.