Abstract: A guide roll particularly suitable for conveying workpieces of high temperature, which: includes a steel core shaft internally provided with a cooling water passage along the axis thereof; a ceramic sleeve covering the circumference of the core shaft and constituted by a plurality of separable annular ceramic segments loosely fitted on and along the length of the core shaft; and fixing members for holding the respective annular ceramic in axially abutted state on the core shaft.

Abstract: A guide roll of the type which is provided with a ceramic sleeve around the circumference of a steel roll shaft with an internal cooling water passage, the guide roll including a cylindrical ceramic sleeve constituted by a multitude of discrete ceramic segments assembled into a number of annular unitary rings fitted around the circumference and along the length of the roll shaft, the individual ceramic segments being mounted in a restricted state at least in radial and circumferential directions of the roll shaft; and end plates securely fixed to the opposite ends of the roll shaft to grippingly hold the respective unit rings in an axially abutted state on the circumference of the roll shaft.

Abstract: A ceramic guide roll having a multitude of discrete ceramic segments cylindrically assembled around the circumference of a steel core shaft of the guide roll, the ceramic guide roll including a stopper member provided at a first end of the steel core shaft and a segment retainer attached to a second end of the steel core shaft opposite the first end through a resilient mechanism for holding the ceramic segments constantly in abutting engagement with each other in the axial direction of the steel core shaft in cooperation with the stopper member.

Abstract: A method and apparatus of continuous casting with the use of a mold oscillating system adapted to oscillate a casting mold supported by a oscillating frame, the method including oscillating the mold by applying vibration at a preselected frequency higher than the natural frequency of the oscillating system; and increasing the amplitude of applied oscillation to a value in a range as determined by the ratio of a length of time of a downward movement period of the mold to a time length in which the speed of the mold exceeds the casting speed during the downward period. Preferably the preselected frequency of applied oscillation of the mold is approximately 1.5 times higher than the natural frequency of the oscillating frame.

Abstract: The high frequency incising device includes a flexible tubular member secured to a manipulating unit. The tubular member has an open ended tip portion and a pair of longitudinal spaced openings in the wall of the tube. An electrically conductive wire extends through the flexible tube passing outwardly thereof through a forward one of the longitudinal openings and being anchored to the flexible tube at a rearward one of the longitudinal openings. Such anchoring is accomplished by bending the wire toward the tip portion of the tube. A second bend portion in the outwardly exposed wire is directed away from the tip portion such that the outwardly exposed wire takes on the shape of a fan or sector. An opposite end of the wire is connected to an electrically conductive pipe that is movably disposed in the manipulating unit and the tube. An end of the movable pipe that projects beyond the manipulating unit is connected to an anchoring device that is movable with respect to the manipulating unit.

Abstract: This invention relates to a liquid fuel combustion apparatus such as oil space heater in which liquid fuel is vaporized by a vaporizer and the vaporized liquid fuel is injected through a first nozzle to a burner. The vaporizer is heated by combustion of fuel gas which is injected through a second nozzle to the burner before the vaporizer has been heated up to a temperature at which the liquid fuel passing the vaporizer is evaporated. The injection of the fuel gas from the second nozzle to the burner is changed to the injection of the vaporized liquid fuel from the first nozzle when the vaporizer has been heated up to a desired temperature. The supply of the liquid fuel to the vaporizer is carried out by a fuel pump which is driven by electric power generated by a thermopile.

Abstract: An illumination device for photographing a portion of the body cavity to be examined with an endoscope having a light source using a discharge tube circuit for illuminating the portion to be examined and a mechanical shutter arranged in the optical path of illuminating light from the light source. A light quantity detecting circuit detects information on the brightness of illumination of the light source and a correct exposure time setting circuit together a correct exposure time estimating circuit receive the output from the light quantity detecting circuit. The closure of the mechanical shutter is controlled by the control operations of the correct exposure time setting circuit and correct exposure time estimating circuit. The discharge tube circuit comprises a time constant circuit, a relay circuit and a high voltage circuit. The high voltage circuit is controlled by the relay circuit to intermittently apply a voltage to start discharge until ignition takes place.

Abstract: An illuminating light control device for an endoscope for controlling both the intensity and hue of illuminating light over a wide range. A shutter mechanism is disposed between a discharge lamp light source and the receiving end of an optical fiber bundle. The shutter mechanism may be moved between at least three positions. At the first position, the light is allowed to pass directly from the light source to the optical fiber bundle and the light source is allowed to vary between its maximum and minimum limits. At the minimum limit, the shutter mechanism disposes a transmission light control means in the light path and the light source is returned to its maximum limit whereupon the output light to the optical fiber bundle is the same before the change as afterward. The light source can then be varied again between its maximum and minimum limits thereby effectively doubling the range of light output intensity.

Abstract: An electrical surgical knife which may be inserted into a body cavity of a patient through an endoscope in which electrical shock to the patient or user of the knife is prevented. A positive polarity electrode of the knife is disposed inside a flexible insulating tube. Around all but an end protruding active portion of the positive polarity electrode there is disposed a conductive metal sheath which is insulated therefrom. The metal sheath is electrically connected to a metal plate electrode which is adapted to be disposed in electrical contact with the skin of a patient.

Abstract: A four-way lever switch which can occupy four different switching positions by moving the shift lever and which upon release of the shift lever, it and its apertaining parts at once return to their neutral positions. In the switch, a block carrying movable contacts moves on stationary contacts arranged on the base of the housing and its movements are guided by a plate mounted on the block. The guide plate is provided with an oblong aperture in which a hollow cube formed integrally with the block is movably inserted. The block moves laterally along the oblong aperture while the guide plate remains stationary. The guide plate moves only when the block is shifted in the direction perpendicular to the oblong aperture. By means of the guide plate, the movements of the contact carrying block are correctly conducted and no disturbance in the relative positions between the stationary and the movable contacts occurs.