Abstract: A concrete or masonry breaker for mounting on a hydraulically operated shovel, for example, in which a pair of jaws pivoted one on the other is operated in pincer fashion by a hydraulic ram, one of the jaws having a long limb along which the ram is disposed to operate the jaws. The long limb provides a long mounting base for the breaker so that high bending moments can more easily be applied to the concrete to break it. A combined forward and backward acting embodiment is described.

Abstract: A power shovel is described in which the bucket describes a straight line loading movement under power from the luffing rams alone, different straight line movements being obtained by adjustment of the length of the lifting rams which form one side of a deformable quadrilateral. The movements may be level, sloping or vertical. The main arm is shorter than the backet arm so that the loading movements can start close to the chassis of the shovel and the quadrilateral is not deformed into a triangle. A parallelogram linkage for controlling the attitude of the bucket extends from the chassis so that changes in position of the main and bucket arms do not influence the attitude of the bucket.