Demolition tool for a hydraulic excavator

A heavy-duty demolition tool for attachment to the boom structure and hydraulic system of a hydraulic excavator, comprising

• a frame means mountable on the boom structure,
• a pair of demolition jaws pivotally connected to the frame means, each of the jaws being swingable through an operational arc from an open position at one end of the arc wherein the jaws are widely spaced from each other to receive a large workpiece between the jaws, and to a closed position at a second end of the arc wherein the jaws have been brought together,
• extensible and retractable means producing substantially linear thrust and having a pair of thrust bearings each connected to a respective jaw to swing therewith through said operational arc, the direction of thrust at each bearing being substantially tangential to the arc of the bearing at a location approximately midway, between the ends of the arc, whereby to move both jaws toward closed position to demolish a workpiece.

A heavy duty demolition tool for attachment to the boom structure and hydraulic system of a hydraulic excavator, comprising

• a frame means comprising rigid mounting portions mountable on the boom structure,
• a pair of demolition jaws having pivot means connecting the jaws to each other and to the frame means, both of the jaws being swingable relative to the frame and through predetermined operational arcs and the jaws having workpiece engaging portions swingable between open and closed positions as the jaws move through the operational arcs,
• and extensible and retractable means producing substantially linear thrusts and having a pair of thrust bearings each connected to a respective jaw to swing therewith through said operational arc, the force at the workpiece engaging portions of the jaws being substantially the same as the total thrust applied at the bearings throughout the operational arcs of both jaws.

A heavy-duty demolition tool for attachment to the boom structure and hydraulic system of a power implement, comprising

• a frame mountable on the boom structure,
• a pair of heavy-duty workpiece demolishing jaws comprising mounting portions,
• and jaw mounting means mounting both jaws for swinging about one axis relative to the frame and relative to each other and comprising a mounting pin portion removably mounting the jaws on the frame, and also comprising a rotatable connector portion retaining the jaws together independently of the frame.

A heavy-duty demolition tool for attachment to the boom structure and hydraulic system of a hydraulic excavator, comprising

• an elongate frame comprising a rear portion attachable to the boom structure and also comprising a front portion,
• a pair of heavy-duty workpiece demolishing jaws comprising mounting portions demountably attached to the front portion of the frame and mounting both jaws for swinging about a single axis relative to the frame and relative to each other between open and closed positions,
• and a pair of extendable and retractable hydraulic cylinders extending along the elongate frame and comprising mounting pivots on the rear portion of the frame and also comprising connection portions pivotally connected to the portions of the jaws adjacent to the front portion of the frame, and cylinders extending in a forward direction and retracting to swing the jaws through an operational arc about said single axis between open and closed positions.