Abstract: An output adapter for connecting between an output connector of a power hand tool and a rotary input connector of an apparatus for working. The output adapter includes an adapter body and a tubular handle. The adapter body has a first connector connectable to the output connector of the power hand tool, a second connector connectable to the rotary input connector of the apparatus, and a shank connected between the first connector and the second connector. The tubular handle is rotatably sleeved onto the shank of the adaptor body for holding by a user operating a power hand tool to drive a working apparatus through the output adapter.

Abstract: A driving circuit for electrical nailing gun is disclosed to include a capacitive charging/discharging unit formed of a first resistor, a first diode, and a capacitor connected in series and connected with two opposite ends thereof to the positive and negative poles of AC power source, an excited field unit formed of a first coil and a first electrically-controlled switch connected in series and having two opposite ends connected in parallel to the capacitor, and a control unit electrically connected to the first electrically-controlled switch for activating the first electrically-controlled switch.

Abstract: A power tool is composed of a shell body, a battery pack detachably mounted on the shell body, a lamp assembly mounted on the shell body for projecting the light on the working zone thereof, and a power detective circuit for detecting the power storage of the battery pack; the outcome of the power detection can be shown by the lamp assembly.

Abstract: A positionable screwdriver includes a first housing member, a second housing member pivotally connected with the first housing member, and a positionable mechanism arranged between the first and second housing members. The positionable mechanism has a locking button, a leaf spring, a positioning block, a retaining member, and a spring. The positioning block is formed with a plurality of radial teeth and fixed to the first and second housing members. The locking button is arranged within the second housing member and positioned over the leaf spring. A top of the locking button is provided with a raised portion extending upwardly through an opening of the second housing member. The spring has an end bearing against another end of the locking button so as to keep the locking button positioned over the leaf spring, thereby keeping engagement between the leaf button and the positioning block.

Abstract: A ballast includes a power unit for supplying DC, a converting unit having four switches connected to the power unit for converting DC into AC, a voltage-resistant electrocontrol switch connected to the converting unit and having at least one high-voltage diode and an electrocontrol switch, all of which are arranged in parallel, a high-voltage ignition unit connected to the voltage-resistant electrocontrol switch, a current sensor connected to the converting unit, and a control circuit connected to the converting unit, the power unit, the high-voltage ignition unit, and the voltage-resistant electrocontrol switch for manipulating the actions of the aforesaid elements, such that the ballast is in high-voltage and parallel structure. In addition, the electrocontrol switch of the voltage-resistant electrocontrol switch contains inside high-voltage-resistant insulated oil for enabling the voltage-resistant electrocontrol switch to be resistant to high voltage for AC running through.

Abstract: An electric hand tool includes a housing, which houses a driving mechanism and a chuck for driving a bit, a battery pack for providing electricity to the driving mechanism, and a switch unit installed in the housing. The switch unit has a switch, an operating member for switching on/off the switch to control supply of electricity from the battery pack to the driving mechanism, and a switching lever extended out of a through hole in the rear portion of the housing and forming a switching portion for operation by the thumb of the hand holding the housing to drive the switching lever to change the direction of electric current and to further reverse the direction of rotation of the driving mechanism.

Abstract: A driving circuit for electrical nailing gun is disclosed to include a capacitive charging/discharging unit formed of a first resistor, a first diode, and a capacitor connected in series and connected with two opposite ends thereof to the positive and negative poles of AC power source, an excited field unit formed of a first coil and a first electrically-controlled switch connected in series and having two opposite ends connected in parallel to the capacitor, and a control unit electrically connected to the first electrically-controlled switch for activating the first electrically-controlled switch.

Abstract: A battery charging and/or DC power supply circuitry employs a control circuit through an SCR drive circuit and an MOS drive circuit to control when to turn on/off a semiconductor switch unit and to turn on the semiconductor switch unit while an initial section of each positive half wave of an AC power source and an terminating section of the same are located below a predetermined level for intercepting partial power for charging. While charging a battery, the circuitry is lightweight, small-sized, and to enhance the life of the battery. While being a DC power supply, the circuitry is small-sized, high-efficiency, and low-cost.

Abstract: An electric nailing gun is disclosed to use a sensor in the nail magazine and to connect the sensor to a control circuit such that when a magazine follower is moved to a predetermined position in the nail path, the sensor sends a control signal to the control circuit to drive a counter to start counting the number of striking actions of the plunger, and the control circuit controls the electric nailing gun to reduce the plunger impact when the counting of the counter reaches a predetermined value.

Abstract: A ballast includes a power unit for supplying DC, a converting unit having four switches connected to the power unit for converting DC into AC, a voltage-resistant electrocontrol switch connected to the converting unit and having at least one high-voltage diode and an electrocontrol switch, all of which are arranged in parallel, a high-voltage ignition unit connected to the voltage-resistant electrocontrol switch, a current sensor connected to the converting unit, and a control circuit connected to the converting unit, the power unit, the high-voltage ignition unit, and the voltage-resistant electrocontrol switch for manipulating the actions of the aforesaid elements, such that the ballast is in high-voltage and parallel structure. In addition, the electrocontrol switch of the voltage-resistant electrocontrol switch contains inside high-voltage-resistant insulated oil for enabling the voltage-resistant electrocontrol switch to be resistant to high voltage for AC running through.

Abstract: An elbow-type power hand tool including a housing, a motor, a planet gear set, a transmission shaft, and a torque controller mounted in the housing for controlling output torque of the transmission shaft. The power hand tool including a battery pack mounted in the housing that provides electricity to a power drive, an output shaft coupled to the transmission shaft that extends perpendicular to the transmission shaft, and a chuck assembly coupled to an end of the output shaft remote from the transmission shaft for holding a tool bit.

Abstract: A power tool is composed of a shell body, a battery pack detachably mounted on the shell body, a lamp assembly mounted on the shell body for projecting the light on the working zone thereof, and a power detective circuit for detecting the power storage of the battery pack; the outcome of the power detection can be shown by the lamp assembly.

Abstract: A screwdriver includes a handle and a plastic gear mechanism which drives a bit engaging device by a power source connected to the handle. A positive plate and a negative plate are respectively connected to the handle. A light frame has at least one light bulb connected thereto and a positive ring and a negative ring are respectively engaged with the light frame. A spring is mounted to the bit engaging device and connected between the negative ring and the negative plate. The at least one light bulb is connected to the positive ring and the negative ring. A gap is defined between the positive plate and an extension of the positive ring. An annular switch is rotatably mounted to the light frame and includes a touch piece which contacts both of the position plate and the extension of the positive ring to light the at least one light bulb.

Abstract: An electric power tool includes a tool unit and a battery pack. The tool unit includes a pair of conjunct grooves and two corresponding blocks. The battery pack includes a pair of conjunct rails and two locking members. The tool unit and the battery pack are connected and locked with each other respectively by that the conjunct grooves and the conjunct rails are interconnected with each other and the two locking members and the two blocks are jammed together. In addition, the tool unit and the battery pack can be dimensionally reduced and the cohesive effect therebetween can be strengthened respectively by the conjunct grooves and the conjunct rails.

Abstract: A screwdriver includes a handle and a plastic gear mechanism which drives a bit engaging device by a power source connected to the handle. A positive plate and a negative plate are respectively connected to the handle. A light frame has at least one light bulb connected thereto and a positive ring and a negative ring are respectively engaged with the light frame. A spring is mounted to the bit engaging device and connected between the negative ring and the negative plate. The at least one light bulb is connected to the positive ring and the negative ring. A gap is defined between the positive plate and an extension of the positive ring. An annular switch is rotatably mounted to the light frame and includes a touch piece which contacts both of the position plate and the extension of the positive ring to light the at least one light bulb.