A rock drill feed mechanism in which a drill motor is reversibly driven along a guideway by a rotatable power screw. The guideway is slidably mounted on an elongated support for reversible movement therealong by a second power screw mounted on the guideway. The power screws are driven independently by fluid motors and may be selectively controlled to operate the feed mechanism in a telescoped condition for movement of the drill motor alone or movement of the drill motor and the guideway to extend the useful feed length. A control circuit includes sensing devices for determining when the feed mechanism is fully telescoped or fully extended for reversing and shutting off the drill motor, respectively.

A device for mounting a hand operated drill such as a rotary or sinker drill on a backhoe attachment for tractors and trucks including a slide mounted tool carrier attached to a roller chain loop mounted on a mast assembly. The mast assembly is either removably mounted on the bucket of the backhoe attachment or to the bucket linkage. High cycle oscillation is dampened by a shock absorber booster spring assembly. The spring assembly may also be used in combination with a fluid control valve mechanism to automatically adjust the drilling and vance. A trunnion assembly may be provided to increase the positionability of the mounting device. A flow control valve connected to the spring assembly automatically maintains constant thrust values to the drill.

A mounting apparatus for a rotational drive unit. The rotational drive unit includes a socket portion which receives a truck or carrier. Opposing engagement surfaces of the carrier are separated by a distance greater than the length of the socket. The resulting lost motion connection allows for a range of free movement of the rotational head on the carrier.

A hydraulically operated drilling apparatus having a main mast on which an extension is mounted having a rope winch or the like for operating a rotary drilling head or power capstan. The drilling head is guided on a pair of diametrically opposed rails fixed on the outer circumference of the mast along its entire length and is pulled by a cable of a block and tackle system activated by a hydraulic power drive located within the mast. The cable of the block and tackle system which in part runs on the exterior of the mast passes into the mast and is caused to run over a movable pulley sheave secured at each end of the mast. The sheaves at the end of the mast are mounted on bearings which also anchor the cable, which bearings are securely and integrally formed with end caps or covers, sealing the end of the mast.

A rock drill includes a mounting frame to which a hammering apparatus and a rotating apparatus is arranged. The mounting frame is made maneuverable with respect to a feeding beam by means of slide blocks fastened to it, whereby a separate carriage is not needed between the drill and the feeding beam. Owing to the mounting frame, the hammering apparatus and/or the rotating apparatus can be replaceable modules. The invention further relates to a mounting frame which is arranged to transmit the feed and recoil forces directed to the drill to feeding means. The mounting frame comprises a section parallel to the feeding beam, to which slide blocks are fastened, and a transverse axial support thereto, to which the hammering apparatus and the rotating apparatus are mounted.