Abstract: A contact portion switch device of a circuit breaker which is capable of guaranteeing reliable operation by restraining distortion of each construction part in the operation of the circuit breaker and permitting an easy installation of an additional part for performing multifunction is disclosed.

Abstract: A vacuum circuit breaker comprises: a plurality of switching mechanism units having movable contacts and stationary contacts for connecting/breaking an electric circuit between an electric source and an electric load respectively, and disposed in lengthwise direction; an actuator unit including at least one rotary shaft for providing the movable contacts with dynamic power so as to move to positions contacting to the stationary contacts or to positions separating from the stationary contacts; a supporting frame for fixing and supporting the switching mechanism units and the actuator unit; and a transfer link unit for transferring rotating movement of the rotary shaft to a plurality of vertical movements, whereby the vacuum circuit breaker can be easily installed in a power distributing cabinet and a power of the actuator unit can be evenly transmitted to the plurality of switching mechanism units.

Abstract: The present invention relates to chloride-selective electrodes which comprise insoluble metal salt layer and a protecting membrane formed of hydrophilic polyurethane thereon, wherein the hydrophilic polyurethane coated chloride-selective electrodes show fast activation and response time and are usefully employed to accurately measure the chloride by reducing the interference from bromide and iodide or preventing the surface of the electrode from protein adsorption.

Abstract: A method for recycling copper oxide includes: a first step in which a sodium hydroxide aqueous solution is added to acidic copper chloride waste etchant produced in the PCB industry, to obtain copper hydroxide slurry; and a second step in which the slurry obtained in the first step is heated and sintered to thereby prepare a needle-form copper oxide. Since copper oxide has a purity of more than 99.0 wt % and the needle-form crystal morphology, so that it has an excellent filtering ability and homogeneous particle size distribution.

Abstract: A door lock device having an indoor and outdoor housing, each having inner tube-shaped supports, and further including indoor and outdoor handle connection members, each having at a first end handle connections with an indoor and an outdoor handle, respectively, and having at a second end opposite the first end driving cams formed with a cam curvature having step differences in an axial direction. Indoor and outdoor slide cylinders are provided having driven cams in contact with the driving cams and experiencing a rectilinear motion in the axial direction by means of the axial step difference. A first coupling spring is fixed to the indoor handle connection member and the indoor slide cylinder. A second coupling spring is fixed to the outdoor handle connection member and the outdoor slide cylinder. Indoor and outdoor end frames allow the indoor and outdoor slide cylinders to be guided rectilinearly in the axial direction by means of a rectilinear guide fitting.

Abstract: A system for controlling a brushless DC motor which can minimize a torque ripple of a motor, thus reducing minute vibrations of the motor and loading devices and increasing efficiency. The system includes a current command generator for producing a current command signal by multiplying a wave form of the current command signal in correspondence to position information by the desired size of the current command signal; a current controller for controlling actual current in the motor to follow the current command signal produced from the current command generator, in response to a feedback error control signal having proportion, integral, and differential elements, and producing a signal for turning ON/OFF following the current command; and an inverter circuit for controlling switching elements to be turned ON/OFF by the signal produced from the current controller, and the desired amount of current to be applied to three-phase coils by a power supply unit.

Abstract: An anti-skid tire apparatus includes a cover structure having a plurality of sections, each of the sections having an outer tread surface, the each section having internal and external sidewalls, the external sidewall having a plurality of fastening slots, the outer tread surface having a plurality of grooves, the grooves having a first plurality of apertures, a plurality of cleats each having a plurality of jagged edges, the cleats being permanently affixed in the first plurality of apertures at fixed intervals along the outer tread surface of the sections, a plurality of straps affixed onto the plurality of fastening slots, a belt passing through the plurality of straps, the belt having a belt buckle to fasten ends of the belt, and a connecting hook and an eyelet located at the internal sidewall of each section, the connecting hook and the eyelet fastening the sections together.