Abstract: A hammer for demolishing sidewalks and the like comprises a hammer coupled to a backhoe or skid steer loader for actuation thereby. The hammer head is mounted to a main spring which is clamped at one end to a backhoe or the bucket of a skid steer loader. Leaf springs of descending lengths are positioned adjacent the upper and lower surfaces of the main spring and affixed to the bucket or backhoe with a clamp. The springs on the upper surface of the main spring force the main spring downwardly during a hammer stroke initiated by the backhoe or bucket while the return springs force the hammer head upwardly after the stroke. The leaf spring arrangement adds a considerable whipping action to the hammer impact. The bucket is protected from excessive force generated by the whipping hammer head by the damping action of the leaf springs.