Abstract: A steel plate cutter has a pair of stationary arms arranged with a predetermined gap therebetween, and a movable arm arranged between the stationary arms. An intermediate portion of the movable arm is pivotally supported by the stationary arms. Stationary and movable ends of a hydraulic cylinder are pivotally coupled to the proximal ends of the stationary arms and the movable arm. A pair of base blades that oppose a shearing push blade fixed to the distal end of the movable arm are fixed on the distal ends of the stationary arms. When the movable arm is driven by the hydraulic cylinder to approach and separate from the stationary arms, the shearing push blade of the movable arm enters or escapes from the gap between the base blades of the stationary arms. When the shearing push blade slides between the base blades, it cuts a steel plate in a belt-like strip by coaction with the base blades by a shearing force. The cut strip of the steel plate is bent in a direction away from the steel plate.

Abstract: An equipment adapted to be installed on a working machine, for crushing a structure. A hydraulic piston-cylinder unit is mounted to a bracket member to be mounted to the wording machine, for angular movement relative to the bracket member about an axis of a piston rod of the hydraulic piston-cylinder unit. At least one of a pair of opposed arms has a forward end provided with a crushing member. The pair of arms are operatively connected to the piston rod for pivotal movement, between closed and open positions, toward and away from each other and toward and away from a plane including an axis of the piston rod. A wall of a cylinder of the piston-cylinder unit is formed with passageway supplying hydraulic fluid from a hose unit of the working machine, into the cylinder. A rotatable coupling enables the passageway and the hose unit to communicate with each other, even when the piston-cylinder unit moves angularly about the axis of the piston rod relatively to the bracket member.

Abstract: A pair of side plates are provided in opposing and spaced relationship, a pair of jaw members are pivoted to a pair of main shafts extending between said side plates, a pair of opposing crushing blades are mounted on the leading end side of said jaw members for pinching and partially crushing a workpiece positioned therebetween in response to the closing movement of said jaw members and a pair of shearing blades are mounted on the base end side of the jaw members for shearing off said workpiece on the crushed portions of the workpiece in response to the closing movement of the jaw members.