Abstract: A sub-soiler has a plow bottom for subsoil for opening a furrow in a subsoil layer and raising subsoil so as to discharge the subsoil on the surface on one or both sides of the furrow and a plow bottom for top soil, located on the subsoil discharge side posterior to the plow bottom for subsoil, for breaking a top soil layer and dispersing subsoil clods discharged on the surface by the plow bottom for subsoil. Permeability of the soil at the furrow opened in the subsoil layer is improved by dispersing clods of the discharged subsoil and breaking up the top soil.

Abstract: Disclosed is a crushing equipment for crushing a pillar or beam of concrete structures through opening and closing movement of a pair of arms while clamping the pillar or beam by a pair of crushing blades provided on the ends of the arms. A hydraulic cylinder 1 for opening and closing the arms comprises a second cylinder including a couple of cylinders 3' and 3", and a pair of first cylinders fitted into the cylinders 3' and 3", respectively, and each having a cylinder bottom serving as a piston 9. When a hydraulic oil is introduced through a fifth oil port 18 provided in the second cylinder on the side of the cylinder bottom, the first cylinders 2 are forwardly displaced. When the first cylinders 2 reach their stroke ends, pistons of the first cylinders are forwardly moved to close the arms for crushing the concrete structure. When the hydraulic oil is introduced through fourth oil ports 16, the pistons 5 are retracted by way of second oil ports 10 and oil passages 11.

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.