The hydraulic hammer is mounted on a hydraulically mobile frame. The hydraulic hammer is capable of travelling in either forward or reverse direction and is provided with lift able weights to which a tool for digging or breaking up a surface is attached. The hydraulic hammer is equipped with time delay controls which: 1) momentarily stop the travel of the hydraulic hammer as the weights and the attached digging tool free fall from a raised position until the digging tool impacts the surface to be busted up, and 2) cause the hydraulic hammer to resume travel as the weights are again raised in preparation for another impact.The hydraulic hammer rapidly repeats these cycles of impact and travel to break up a surface. Adjustments are provided on the hydraulic hammer for regulating the force of the impact and the distance traveled between impacts in order to match the hydraulic hammer's impact and travel cycles to the break characteristics of the surface to be removed. Hydraulic hammer for breaking up a surface comprising: weights movably attached to hydraulic lifting means provided on the hydraulic hammer, a digging tool attached to the weights so that the digging tool impacts the surface when the weights fall from a lifted position. Currently, surfaces to be repaired, such as cement slabs and asphalt used in highway construction, must first be busted up by some type of breaking equipment, and then the busted up pieces must be removed by a back-hoe or other similar dirt moving equipment before repair or replacement of the surface can be accomplished. Breaking equipment currently available are large machines which are difficult to transport and cannot be maneuvered in tight locations. None of the available breaking equipment co ordinate the forward or reverse travel of the machine with the breaking stroke or action of the equipment. The operator in the hydraulic hammer must perform this coordination when using existing equipment. These shortcomings are overcome in a hydraulic hammer.
Briefly, hydraulic hammer which is capable of automatically synchronizing the lifting of a weight package and attached digging tool with forward or reverse travel of the hydraulic hammer and is also capable of synchronizing the dropping and impact of the weight package and digging tool with stopping of the forward or reverse travel of the hydraulic hammer. Synchronization in the hydraulic hammer is accomplished through use of relay and delay timers which serve to electrically control the operation of hydraulic regulating solenoids. The solenoids, in turn, lift or allow the weights to drop and control travel of the hydraulic hammer.
