Abstract: A front end loader has a loading bucket secured to a tractor and a transversely elongate cutter blade closely spaced forward of a lower front edge of the bucket. Improved apparatus for reciprocating the blade in forward and aft directions relative to the front edge of the bucket is disclosed. A force transmitting beam has a resonant frequency with at least on node and first and second anti-nodes at the resonant frequency. A source of vibrations at or near the resonant frequency is coupled to the beam near the first anti-node to vibrate the second anti-node about a neutral position. The beam is secured near one node so as to locate the neutral position of the second anti-node in spaced relationship from the cutting blade within striking distance thereof. The second anti-node thus applies unidirectional force impulses to the blade in a forward direction as the second anti-node vibrates to drive the blade intermittently forward.

Abstract: An improved system for cutting pavement into chunks for excavation is disclosed. A plurality of transversely spaced blade elements are provided with forwardly directed cutting edges, the cutting edges on adjacent blades having alternating downward and upward inclinations. The blade elements are attached to a frame so that the elements are reciprocable forwardly and rearwardly. The frame is motivated so that the cutting edges of the blade elements intersect the edge of the pavement. A resonant drive supported by the frame has a vibratory output coupled to the blade elements to drive the blade elements intermittently forwardly and against the pavement. Adjacent cutting elements force the pavement upwardly and downwardly respectively to break the pavement into chunks.

Abstract: A bulldozer having a transversely elongate cutter blade closely spaced from the bottom edge of the mold board is disclosed. The cutter blade is mounted for reciprocal motion in forward and aft directions relative to the mold board. Unidirectional force impulses are applied to the cutter blade in a forward direction to drive the blade intermittently forward without aft motion. Preferably, the unidirectional force impulses are applied by first and second matched force transmitting beams. Each beam has two divergent approximately straight legs that meet at a juncture to form an acute, approximately 90.degree. angle, a node at the juncture, an input anti-node at the end of one leg, and an output anti-node at the end of the other leg at the input frequency. A source of vibrations at or near the resonant frequency is coupled to the input anti-node and the output anti-node is disposed in spaced aft relationship from the cutter blade within striking distance thereof.

Abstract: 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.

Abstract: An apparatus for removably mounting a hand-held tool such as a pavement breaker or tamper releasably on the wrist linkage of the bucket for a backhoe attachment for a tractor or truck including an attachment member having a slide rail, a carriage slidably mounted on the slide rail, a biasing member mounted on the attachment member biasing the carriage to a tool nonoperating position and a control member mounted on the attachment member adapted for engaging the tool operating lever.