Abstract: A grinding method is provided which is capable of uniformly and precisely grinding objects for a short time, softening shocks produced when the rotation of a grinding barrel is changed between the forward direction and the backward direction to thereby eliminate bruises on the surface of grounded objects, coping with grinding for a large number of objects to be ground in a small quantity or a heavy-weight or a large-size object to be ground, and preventing contacts and collisions between objects to be ground. The grinding method comprises the steps of rotatably mounting not less than one grinding barrels at locations away from the central axis of a rotary drum, enclosing a grinding material and objects to be ground in the grinding barrels, rotating the grinding barrels in the directions identical to and opposite to the direction in which the rotary drum is rotated, and grinding the objects to be ground. An grinding apparatus for implementing the above-mentioned method is also provided.

Abstract: A grinding method is provided which is capable of uniformly and precisely grinding objects for a short time, softening shocks produced when the rotation of a grinding barrel is changed between the forward direction and the backward direction to thereby eliminate bruises on the surface of grounded objects, coping with grinding for a large number of objects to be ground in a small quantity or a heavy-weight or a large-size object to be ground, and preventing contacts and collisions between objects to be ground. The grinding method comprises the steps of rotatably mounting not less than one grinding barrels at locations away from the central axis of a rotary drum, enclosing a grinding material and objects to be ground in the grinding barrels, rotating the grinding barrels in the directions identical to and opposite to the direction in which the rotary drum is rotated, and grinding the objects to be ground. An grinding apparatus for implementing the above-mentioned method is also provided.

Abstract: A railway bed wherein a body on which rails are to be fitted is formed of an elastic member and rigid member and a reinforcing member is provided within the elastic member or at least on the lower surface of the rigid member.With such formation, the railway bed has a proper shock absorption and rigidity and can be expected to prevent vibrations and noises.

Abstract: A grinding method characterized in that a rotatably arranged grinding tank and downward projecting spindles rotatable in any direction on a stationary or rotatable main shaft stand positioned above the grinding tank and fitted to a fitting column body are provided, the grinding tank is charged with such grinding materials as hone grains and is stopped or rotated at a low or high speed depending on the work product. The work product to be ground is fitted to the spindle on the main shaft stand, is put into the grinding materials within the tank and is rotated reversely to or in the same direction as of the rotation of the grinding tank or is stopped and the work or the grinding tank is moved up and down and forward and rearward so that the work may be ground in a low pressure fluid state or high pressure fluid state. The tank is sealed to permit high grinding pressures when the tank and work products are rotated at high speeds.

Abstract: A vertically arranged circular or polygonal grinding tank and shafts which are fixed to or rotatably formed on a main shaft plate provided rotatably above the grinding tank are provided. The grinding tank is charged with such proper grinding material as hone grains or a medium and workpieces are held or suspended from the shafts and are submerged and moved into the grinding material. The main shaft plate is rotated, and the shafts are stopped, rotated or moved through different angles. Either or both of the grinding tank and main shaft plate is or are moved up and down so that the workpieces may be ground by the frictional slide and flow of the grinding material. Thus, workpieces and particularly large workpieces can be uniformly ground within a short time and a multi-purpose grinding can be made.

Abstract: An agitating mixing apparatus wherein a cylindrical or polygonal tank is fitted as inclined at a proper angle to a rotary shaft and agitation and mixing accelerating blades of any shapes and angles are provided within the tank so as to respectively separately operate to cause a centrifugal flow, rotary flow, diagonal flow and 8-shaped flow to things to be mixed.

Abstract: Grinding apparatus wherein a cylindrical or polygonal tank of any material and a proper length lined on the inside surface with any of such materials as a rubber, synthetic resin, brush, fiber and paper pulp. The tank is held at one end and is rotated at the other in a universal joint end. Thus, grinding agents and materials to be ground are put into the tank at the held end. A centrifugal motion is generated on the inner peripheral surface of the tank and the materials will flow to the other end and be ground while rotating spirally due to the centrifugal force on the inner peripheral surface of the tank while in contact with grinding agents. Further, a grinding apparatus wherein a cylindrical or polygonal tank of any material and a proper length, as required, lined on the inside surface with any of such materials as a rubber, synthetic resin, brush, fiber and paper pulp is held at one end and is held at the other end with an arm made to make any proper circular motion with crank arms or the like.

Abstract: A grinding method wherein a cylindrical or polygonal tank of any material and a proper length is lined on the inside surface with any of such materials as a rubber, synthetic resin, brush, fiber and paper pulp. The tank is held in a universal joint at one end and is rotated at the other end. Thus, grinding agents and materials to be ground are put into the tank at the held end. A centrifugal motion is generated on the inner peripheral surface of the tank and the materials will flow to the other end and be ground while rotating spirally due to the centrifugal force on the inner peripheral surface of the tank while in contact with grinding agents.

Abstract: A vertical grinder wherein at least two rotating grinding tanks are provided on a horizontally movable bed body, vertically movable and rotatable rotary tanks containing grinding materials respectively for coarse, medium and lustrous finishes are arranged in parallel with them, a vertically movable main spindle is provided above one of said rotary tanks and a plurality of collect chucks are made rotatable and are suspended with a work fitted on the peripheral edge of the lower end surface of said main spindle and are inserted in turn into said rotary tanks respectively for coarse, medium and lustrous finishes to grind the work.