Abstract: A pump for forcedly feeding kerosene or like fluid comprises a rotor, a housing rotatably accommodating the rotor, a stator for forming a rotary magnetic field to rotate the rotor, and a fluid feeding portion. When the rotor is a disk, spiral grooves providing the feeding portion are formed in the rotor and/or a housing wall opposed to the rotor. When the rotor is tubular, a helical groove or grooves are formed in the outer surface of a fixed shaft serving as part of the housing and/or in the inner peripheral surface of the rotor to provide the feeding portion. The pump properly feeds the fluid at widely varying flow rates including a very small rate free of any leak and without producing a loud noise. The pump, including a motor as a component, is compact, thin and simple in construction.

Abstract: A compressor having a rotor, a cylinder rotatably accommodating the rotor, vanes slidably mounted on the rotor, side plates secured to both sides of the cylinder so as to close both open ends of cylinder chambers defined by the cylinder, rotor and the vanes, a suction port and a discharge port for a refrigerant, and a temperature-sensitive valve disposed in the passage communicating with the suction port and adapted to open and partially close the suction port. Representing the rotating angle of the rotor between the position at the beginning of the suction stroke and the position at completion of the suction stroke by .theta..sub.s rad., the volume of the cylinder chamber at the position of completion of the suction stroke by Vo cc, and the effective area of the suction passage between the evaporator and the cylinder chamber in the opening state of the temperature-sensitive valve by a.sub.2 (.theta.) cm.sup.2 ; the means value a.sub.

Abstract: A rotary compressor comprises an open-ended cylinder having its open ends closed by end plates and an eccentrically rotatable rotor housed inside the cylinder. A hydrodynamic seal is provided on either the rotor or each of the end plates for minimizing any possible unwanted leakage of lubricant oil.

Abstract: An improved rotary compressor of sliding vane type in which a rotor head portion is provided where the peripheral surface of the rotor approaches the inner peripheral surface of the cylinder so as to divide the interior of the cylinder into a discharge side and a suction side for fluid, while the cylinder is formed with a seal portion where a clearance between the rotor and cylinder at the rotor head portion is formed into a wedge-like configuration in a rotational direction by an arc having a radius of curvature smaller than a radius of the cylinder.

Abstract: A rotary compressor of the sliding vane type which is constructed to prevent seizure during high speed operation, with increased volume efficiency through reduction of leakage of refrigerant, and simultaneous improvements in refrigeration cycle efficiency by the prevention of entry of oil into the refrigeration cycle.

Abstract: A rotary head assembly having a central stationary shaft one end of which is securely joined to a lower housing, a bearing spacer securely fitted over the stationary shaft at the other end thereof and a rotary sleeve disposed for rotation about the common axis of the stationary shaft and the bearing spacer, whereby a hydraulic bearing is defined by the bearing spacer, the rotary sleeve and a lubricant filled into the space between the bearing spacer and the rotary sleeve, and a hydraulic passage is defined between the stationary shaft and the rotary sleeve. The lower end of the lubricant passage is provided with a magnetic sealing means which seals a magnetic liquid so as to prevent the leakage to the exterior of the magnetic liquid or the lubricant. An upper cylinder which carries one or more video signal recording and reproducing heads is removably mounted on the rotary sleeve.

Abstract: A push rod assembly for a clutch master cylinder having a rod in abutment with a piston of the clutch master cylinder, a clevis operatively connected to a clutch pedal, and a rubber vibration isolator interposed between the rod and the clevis wherein the rod is formed by stamp forging, the clevis is formed by press working and the rubber vibration isolator is secured to the rod and the clevis during forming thereof, thereby decreasing the resulting cost and increasing the intensity of adhesion thereof.

Abstract: In a rotary head assembly for magnetic recording and reproducing apparatus such as VTR sets, of the type comprising a stationary shaft having its one end securely joined to a stationary member, a rotor fitted over the stationary shaft for rotation, a drive means for driving or spinning the rotor and heads mounted on the rotor, the position N of a thrust support for supporting the rotor is so selected as to coincide with the center of gravity G of the rotor or as to be located between the center of gravity G and the center of gravity G.sub.1 of the rotor except an aggregate of component parts of said drive means mounted on the rotor, the center of gravity G being depending upon the center of gravity G.sub.1 and the center of gravity G.sub.2 of the aggregate of component parts mounted on the rotor, whereby the adverse effects of the precession of the rotor on the precision rotation or spinning thereof can be avoided.

Abstract: The present invention relates to a rotary head assembly for a magnetic recording and reproducing device such as VTR. A stationary center shaft is mounted on the side of a stationary cylinder while a rotary sleeve which is fitted over said stationary center shaft for rotation about the axis thereof is disposed on the side of a rotary cylinder. A lubricating oil is injected between the rotary sleeve and the stationary center shaft so that a space between the cylinders may be utilized so as to provide a hydraulic bearing portion. Thus, the rotary head assembly may be made compact in size and to a higher degree of accuracy. In addition, the thrust load carrying point of the hydraulic bearing portion is located on the side of the rotary cylinder, and the portion adjacent to the thrust load carrying point has a sealing arrangement or construction so as to prevent the leakage of lubricating oil and to stabilize the rotation of the rotary cylinder.

Abstract: The present invention relates to a hydraulic bearing construction for carrying thrust loads and provides a hydraulic bearing construction in which for instance, a pivot bearing having a small contact area is combined with two thrust bearings which have widely different load carrying characteristics (axial stiffness or rigidity) so that wear of bearing surfaces caused by starting and stopping will not adversely affect the positional accuracy of an equipment, the equipment can be started at low torque and position errors are minimized.

Abstract: A rotary mechanism with axial bearings comprising a shaft having at least one free end, a housing rotatably fitted over said shaft with a lubricant being contained in the space defined between them, a first axial position control means for controlling the relative axial position between the shaft and the housing, the first axial position control means comprising a thrust axial bearing, which is referred to as "the micro-groove bearing" in the specification, comprising a projection extended from the free end of the shaft or its opposing bearing surface of the housing coaxially of the shaft and radial grooves formed in the face of the free end of the shaft or its opposing bearing surface of the housing in such a way that upon relative rotation between the shaft and housing, the pressure may be built-up in the oil film therebetween, whereby they may be separated from each other; and a second axial position control means which may buildup the pressure or may exert the force in such a direction that the clearance

Abstract: In a rotary head assembly for a magnetic recording and reproducing device of the type in which rotary head member is engaged through a hydraulic bearing with a shaft whose one end is securely fixed to a base and the other end is free, the position of a thrust supporting member formed at the free end of the shaft is suitably selected so as to minimize the adverse effects caused by the thermal expansions of the component parts whereby the variation in relative position between the head and tape due to the temperature variation can be minimized and the high radial rigidity can be attained.

Abstract: In a rotary head assembly for magnetic recording and reproducing apparatus such as VTR, fluid or hydraulic radial and thrust bearings are provided between a stationary sleeve whose one end is closed fluid-tightly and a rotary shaft rotatably extended into said stationary sleeve, whereby the rotary head assembly may be made compact in size and easy to assemble, may rotate with a higher degree of reliability and may completely seal lubricant.

Abstract: The present invention relates to a rotary head assembly for a magnetic recording and reproducing device such as VTR. A stationary center shaft is mounted on the side of a stationary cylinder while a rotary sleeve which is fitted over said stationary center shaft for rotation about the axis thereof is disposed on the side of a rotary cylinder. A lubricating oil is injected between the rotary sleeve and the stationary center shaft so that a space between the cylinders may be utilized so as to provide a hydraulic bearing portion. Thus, the rotary head assembly may be made compact in size and to a higher degree of accuracy. In addition, the thrust load carrying point of the hydraulic bearing portion is located on the side of the rotary cylinder, and the portion adjacent to the thrust load carrying point has a sealing arrangement or construction so as to prevent the leakage of lubricating oil and to stabilize the rotation of the rotary cylinder.