Abstract: A pipe flow-driven power generator includes a vane wheel pivotally mounted in a water chamber in a water pipe and rotatable by a flow of water running through the water pipe, a dynamo pivotally mounted on the outside of the water chamber and coupled to the vane wheel through a transmission gear set for generating electricity upon running of water through the water pipe, and a storage battery for storing electricity generated by the dynamo.

Abstract: A multipurpose radio is disclosed to include a power control unit, which uses a rechargeable battery to provide the necessary working voltage to a LED lamp for illumination, a hand-driven dynamo to generate electricity for recharging the rechargeable battery, a power adapter for charging the rechargeable battery with city power supply, a radio circuit unit for receiving AM and FM radio broadcasting signals, TV audio signals and NOAA signals, and a function mode display unit, which uses a speaker for voice output, a screen for data display, and a selector key for frequency selection.

Abstract: An intercom is disclosed to include a housing houses a transmitter receiver control circuit board, and a hand-driven power generator unit, which has a speed-change gear set, a crank handle pivoted to the housing for operation by a person to rotate the speed-change gear set, and a dynamo coupled to the speed-change gear set and driven to generate electricity for the transmitter receiver control circuit board upon rotation of the speed-change gear set by a person.

Abstract: A battery charger is disclosed to includes a power supply unit for converting AC power supply into DC power supply, and a charging unit, which is detachably connected to the power supply unit and adjustable through a rotary knob to change the length of the battery chambers thereof to fit different sizes of battery cells to be charged by the charging unit.

Abstract: A water sealing structure used in a lamp using a crank handle-operated dynamo to generate electricity is disclosed to have a flexible rubber packing strip fastened to the housing of the lamp to seal the gap between top and bottom cover shells of the housing, a flexible rubber covering affixed to the housing and covered on a lampshade at the housing to seal the gap between the lampshade and the housing, a flexible rubber button covered on the power switch of the lamp to seal the gap between the power switch and the top cover shell of the housing, and a water sealing cap fastened to the bottom cover shell of the housing around the crank handle to seal the gap between the crank handle and the bottom cover shell.

Abstract: A water sealing structure used in a lamp using a crank handle-operated dynamo to generate electricity is disclosed to have a flexible rubber packing strip fastened to the housing of the lamp to seal the gap between top and bottom cover shells of the housing, a flexible rubber covering affixed to the housing and covered on a lampshade at the housing to seal the gap between the lampshade and the housing, a flexible rubber button covered on the power switch of the lamp to seal the gap between the power switch and the top cover shell of the housing, and a water sealing cap fastened to the bottom cover shell of the housing around the crank handle to seal the gap between the crank handle and the bottom cover shell.

Abstract: A battery charger is disclosed to include a rectifier for rectifying AC into DC, two terminal clamps for clamping on the battery to be charged, and a polarity control electrically connected between the rectifier and the terminal clamps for controlling the polarity of the two terminal clamps to match with the polarity of the positive and negative metal contacts of the battery to be charged.

Abstract: A combination electrical mosquito repeller and lamp assembly is disclosed to include a hand-driven dynamo for turning by hand to generate AC power supply for charging a storage battery when rectified into DC power supply and stabilized, a lamp circuit for producing light for illumination, a mosquito repeller circuit for generating a high frequency sound to repel mosquitoes, and a selector switch for selectively connecting DC power supply to the mosquito repeller circuit or the lamp circuit.

Abstract: A multipurpose electric appliance control circuit assembly includes a hand-driven dynamo rotatably driven by hand to generate AC power supply, a rechargeable battery, a rectifier filter circuit for rectifying AC power supply from the hand-driven dynamo into DC power supply and filtering noise from the DC power supply for charging the rechargeable battery. The control circuit assembly also includes a lighting circuit electrically connected to the rechargeable battery for emitting light for illumination subject to the control of a switch, a boosting circuit for boosting the voltage of the rechargeable battery to a predetermined voltage level, and a power output circuit for selectively dropping the boosted DC voltage to one of a series of voltage levels for different electric appliances.

Abstract: A water sprayer and heater assembly for windshield wiper is disclosed to include a controller; a water container connected between a water supply pipe and a water spray tube at the windshield wiper, a water pressure switch electrically connected to the controller and set in communication between the water supply pipe and the water inlet of the water container, and an electric heater mounted in the water container and electrically connected to the controller and controllable by the controller to heat water in the water container when a flow of water passes from the water supply pipe through the water pressure switch into the water container.

Abstract: A bendable tool shank is disclosed to include a rod of metal spiral spring, which has a first metal connector at one end and a second metal connector at the other end, an armored tube surrounding the rod of metal spiral spring, a battery-based power source assembly rotatably coupled to the rod of metal spiral spring around the first metal connector, and a light source assembly rotatably coupled to the rod of metal spiral spring around the second metal connector for giving off light when the user switched on the power switch of the battery-based power source assembly.

Abstract: A power supply device includes a storage power circuit, which has a rechargeable battery, a power generating battery, which generates electricity to charge the rechargeable battery of the storage power circuit, an illuminator circuit to be controlled to give off light for illumination, a charging control circuit to be controlled to charge the rechargeable battery of an external device with electricity from the rechargeable battery of the storage power circuit, and a double-throw selector switch to be controlled to selectively connect the illuminator circuit or the charging control circuit to the storage power circuit.

Abstract: An emergency light set is disclosed to include a bottom cover shell covered with a top cover shell, a lamp mounted in the front side of the bottom cover shell, a mini power generator mounted in the bottom cover shell and electrically connected to the lamp, a rechargeable battery for providing electricity to the lamp, a transmission gear set, and a tool handle detachably mounted in the top cover shell and connectable to the input shaft of the transmission gear set for operation by the user to rotate the transmission gear set and to further drive the mini power generator to generate electricity.

Abstract: An emergency light set is disclosed to include a bottom cover shell covered with a top cover shell, a lamp mounted in the front side of the bottom cover shell, a mini power generator mounted in the bottom cover shell and electrically connected to the lamp, a rechargeable battery for providing electricity to the lamp, a transmission gear set, and a tool handle detachably mounted in the top cover shell and connectable to the input shaft of the transmission gear set for operation by the user to rotate the transmission gear set and to further drive the mini power generator to generate electricity.

Abstract: A water sprayer includes a water pump, a water accumulator for accumulating water from the water pump, a solenoid switch for controlling water output of the water accumulator, a hose nozzle assembly with a tilt angle-adjustable spray nozzle connected to the output side of the solenoid switch, and a controller for controlling operation of the water pump and the solenoid switch.

Abstract: A fruit/vegetable blender having a multi-speed control switch comprises a speed controller mounted on the motor house thereof, for controlling power on/off and motor speed. The speed controller utilizes a variable resistor, a flexible conducting-plate, a conducting slider, a push button, a slider handle and a plurality of conducting ports along the variable resistor to provide a resistance adjusting mechanism, thereby the motor speed changing accordingly. The multi-speed control switch is further protected by an inner retaining plate, an outer retaining plate, a wavy plate and a water-resistant pad from water infiltration.