Abstract: This invention relates to a roof bolt injection mast comprising an elongate member having a length slightly less than the height from the floor to the roof of a tunnel or gallery in which the mast is to be operated, the elongate member being provided with a passage which extends therethrough from one end to the other and a port extending through the sidewall thereof to communicate with the said passage, a portion of the passage extending from the lower end of the member to the point of communication with the port being enlarged whereby a fluid introduced through said port will provide the means whereby a first piston disposed in the enlarged portion of the passage is operable to lock the mast between the floor and the ceiling while a second piston disposed in the main passage provides the means whereby a roof bolt disposed therein will be injected into the roof under the influence of the fluid introduced through the port.

Abstract: This invention relates to a fluid control system adapted to be used in a rock or roof drill to control the drill feed rate automatically with respect to the resistance of the strata material to drill penetration. The system comprises a priority flow divider which functions to divide a fluid supply source into two distinct flow paths and to control the volumetric flow rate of one flow path independent of the demand from either flow path, a first manually operated shut off valve controlling the flow of fluid through one of said flow paths to a drill motor and the second control valve controlling the direction of feed of said drill.