Abstract: An oscillating piston type compressor has a piston formed integral with a blade. The compressor accommodates in a casing a compression mechanism section and a motor section, the mechanism including the piston having a plate-shaped blade integrally formed on a cylindrical portion is fitted onto an eccentric portion of a crankshaft to perform orbital motion relative to an inner peripheral surface of a cylinder, the plate-shaped blade being formed at its radial end surface with a recess or a protrusion, which serves as a reference of position.

Abstract: An oscillating piston type compressor has a piston formed integral with a blade. The compressor accommodates in a casing a compression mechanism section and a motor section, the mechanism including the piston having a plate-shaped blade integrally formed on a cylindrical portion is fitted onto an eccentric portion of a crankshaft to perform orbital motion relative to an inner peripheral surface of a cylinder, the plate-shaped blade being formed at its radial end surface with a recess or a protrusion, which serves as a reference of position.

Abstract: In a rotary piston compressor and refrigerating equipment employing the rotary piston compressor, the interior of a cylinder chamber is divided into a suction chamber and a compression chamber by a vane which is formed unitarily with a roller. The rotary bushing on the compression chamber side which supports the vane is so arranged as to be moved with a specific pressure, so that a communicating passage for communication between the compression chamber and a space on the discharge side will be opened and closed with the movement of the rotary bushing on the compression chamber side.

Abstract: A scroll compressor has an Oldhams ring made of sintered metal operating as a rotation-prevention mechanism for holding the rotation scroll. The Oldhams ring is formed to a size to accommodate the cutting work or the grinding work of the surface processing during the forming of the sintered metal, and, as a result, the productivity of the Oldhams ring can be improved and the wear resistance becomes excellent. A scroll compressor that is inexpensive and has a high reliability may be made of a hard sintered metal which has an excellent wear resistance. A first groove 3a and the second groove 3b are formed in the end face 3 of the ring 2 of the Oldhams ring into the sintered metal. And, after the processing, the first groove 3a is deepest, and the depth is progressively reduced in order of the second groove 3b and the end face 3 in the Oldhams ring. The wear on the corner part of the tool, which is easiest to wear being used to process the side face of the keys is reduced due to the presence of these grooves.

Abstract: Disclosed is a method of working a semi-finished scroll member for a scroll compressor which has a circular end plate having a first end face and a second end face with a spiral wrap extending therefrom. Before the second end face and the wrap are machined, the outer peripheral surface of the end plate is formed therein with a circumferencial groove to provide jaw finger engaging surfaces spaced from the first and second end faces of the end plate. Then, radial grooves are formed in the outer periphery of the end plate such that each groove extends between and is open in one of the jaw finger engaging surfaces and in the first end face of the end plate. Thereafter, the semi-finished scroll member is positioned relative to a machine tool such that the first axial end face of the end plate is placed adjacent a back-up member of the machine tool.

Abstract: Polyolefins having a wide distribution of molecular weights are prepared in a plural stage process, by initially polymerizing the olefins in the presence of a solvent, hydrogen and a highly active Ziegler type catalyst under pressure, and beneath a gas phase containing an inert gas, to form in the first stage a polymer having a relatively high molecular weight. The polymerization reaction mixture from the first stage is continuously flowed to a second stage reactor. The second stage reactor is maintained at a relatively lower pressure, such that the flow is driven by the higher pressure in the first stage. The second stage is agitated and the polymerization reaction mixture is maintained beneath an atmosphere containing olefins and hydrogen gas. Polymers of relatively low molecular weight are formed in the second stage. The product continuously removed from the second stage contains a polymer having a wide distribution of molecular weight.

Abstract: The two secondary windings of a transformer the primary winding of which is connected to an AC power supply are each provided with a controlled rectifying circuit. The DC sides of the rectifying circuits are connected in series to supply power to DC motors. One of the secondary windings is detachably connected with a capacitor bank. The capacity of the capacitor bank is selected so that the power factor of the converter can be improved to a satisfactory value when the two rectifying circuits are both controlled to produce output voltages. The capacitor bank becomes connected in response to the fact that the current in the primary winding of a transformer has arrived at a predetermined value.