Abstract: A fluid pressure hitting device comprises a piston inserted in a cylinder, a chisel, and a first, second, and third chambers. The chisel is fitted in the cylinder such that a part of the chisel projects from one axial end of the cylinder and is configured to further project from that axial end due to being hit by the piston as the piston slides toward the one axial end. The first through third chambers are partitioned by an inner peripheral surface of the cylinder and an outer peripheral surface of the piston. The first through third chambers are arranged in the axial direction in order fluid the one axial end to another axial end of the cylinder. A flow path is configured to supply fluid from a fluid supply portion when the piston hits the chisel, to the first chamber.

Abstract: A fluid pressure hitting device comprises a piston inserted in a cylinder, a chisel, and a first, second, and third chambers. The chisel is fitted in the cylinder such that a part of the chisel projects from one axial end of the cylinder and is configured to further project from that axial end due to being hit by the piston as the piston slides toward the one axial end. The first through third chambers are partitioned by an inner peripheral surface of the cylinder and an outer peripheral surface of the piston. The first through third chambers are arranged in the axial direction in order fluid the one axial end to another axial end of the cylinder. A flow path is configured to supply fluid from a fluid supply portion when the piston hits the chisel, to the first chamber.

Abstract: Crushing equipment includes a pair of crushing members disposed symmetrically with respect to a frame in juxtaposed relationship with each other, the crushing members being pivotally supported at substantially central portions thereof by the frame and having crushing portions each formed on one side of each crushing member and confronting each other, and a fluid-pressure cylinder connecting the other sides of the crushing members to each other. A fitting member is vertically movably mounted on the frame. The fluid-pressure cylinder is movably supported by the fitting member in a longitudinal direction of a cylinder tube of the fluid-pressure cylinder. A damper device is interposed between the fitting member and each of portions of the fluid-pressure cylinder positioned on both sides thereof, so that the fluid-pressure cylinder is resiliently held against the fitting member.

Abstract: An impact device includes a cylinder and a plunger which is received within the cylinder and movable in forward and rearward directions. The plunger includes a first and a second pressure receiving surface for receiving pressure of a pressurized fluid so as to apply force to the plunger in the forward and rearward directions, respectively. An additional pressure receiving surface is formed on the plunger for receiving the pressure from the pressurized fluid so as to apply force in the same direction as one of the first and second pressure receiving surfaces. A first control device is operable to selectively apply the pressure of the pressurized fluid to the additional pressure receiving surface.