Abstract: The present invention relates to the field of rock crushers, in particular, rock crusher attachments for earth moving equipment or the like. The rock crusher attachment includes a front bucket portion configured for scooping rocks to be crushed and a rear crusher portion connected to and in communication with the rear of the bucket portion. The crusher portion includes a housing and a crushing assembly accommodated within the housing. The housing including a pair of spaced apart side panels. The crushing assembly has a lower jaw fixed between the side panels of the housing and an upper movable jaw mounted opposite and spaced apart from the lower jaw. The upper movable jaw assembly includes a support, an upper jaw plate attached to the underside of the support and a jaw-actuating drive assembly operable to urge the upper movable jaw assembly to move between an open jaw setting and a closed jaw setting. The support is pivotally connected between the side panels adjacent the front of the housing.

Abstract: An apparatus for making and breaking a threaded connection between a drill head and a stabilizer mounted on an end of a drill string includes a wrench capable of operatively engaging a portion of the drill head so as to substantially prevent rotation of the drill head with respect to the wrench. A gripper assembly is operatively mounted on the wrench. The gripper assembly is capable of operatively receiving a portion of the stabilizer, and releasably locking the stabilizer against rotation relative to the gripper assembly. Finally, at least one drive unit is operatively coupled between the gripper assembly and the wrench for driving rotational movement of the gripper assembly with respect to the wrench.