Abstract: A construction machine includes a lower traveling body on which an upper rotating body is rotatably disposed. The rotating body includes an upper frame provided with a bottom plate and a supporter acting as a perpendicular member. The bottom plate has an attachment hole extending substantially perpendicular to the bottom plate. The supporter is welded substantially perpendicular to the bottom plate while one end of the supporter is engaged with the attachment hole. Accordingly, the supporter can be easily fixed to the bottom plate while maintaining the perpendicularity and a proper height setting of the supporter.

Abstract: A construction machine includes a lower traveling body on which an upper rotating body is rotatably disposed. The rotating body includes an upper frame provided with a bottom plate and a supporter acting as a perpendicular member. The bottom plate has an attachment hole extending substantially perpendicular to the bottom plate. The supporter is welded substantially perpendicular to the bottom plate while one end of the supporter is engaged with the attachment hole. Accordingly, the supporter can be easily fixed to the bottom plate while maintaining the perpendicularity and a proper height setting of the supporter.

Abstract: A vibrating compressor wherein an alternating voltage is applied from a d-c power source to a drive coil vibrating in a magnetic field via a d-c/a-c converter circuit is disclosed. An alternating voltage of a square wave form is applied to the drive coil of the vibrating compressor in such a manner as to avoid the timing at which a counter electromotive force generated in the drive coil intersects with zero level.

Abstract: A refrigerating system having a compressor; an inverter connected to the compressor for supplying electric energy to the compressor; and an input voltage control circuit provided on the input side of the inverter, wherein the input voltage control circuit generates output voltage signals which change at a predetermined level, including zero level, within a certain temperature range in response to the ambient temperature of the refrigerating system and in accordance with the temperature condition, the voltage thus produced being fed to the compressor via the inverter. The refrigerating system of this invention is, therefore, protected from failure or damage even when placed in an extreme temperature environment, and resumes automatically the supply of power to the compressor when the ambient temperature of the system is restored to the normal temperature.

Abstract: A direct current power supply device for rectifying an a-c voltage of external power supply and supplying d-c power to a battery and/or a d-c load characterized in that it comprises a current detector to detect a current component flowing to the battery, a voltage detector to detect a terminal voltage of the battery, a control circuit controlled by the current detector and the voltage detector, a leakage transformer functioning by external a-c power supply, and a charging converter circuit for supplying d-c power to the battery, the charging converter circuit being controlled by the control circuit and supplied power from the output of the leakage transformer, the control circuit comprising a maximum value detecting circuit to combine output voltage of the circuit detector and the voltage detector, a switching circuit controlled by the maximum value detecting circuit, a pulse generating circuit in which pulse rise time controlled by the switching circuit and a switching control circuit controlled by the pulse