Abstract: A power supply device includes: a battery pack; a transforming unit configured to transform a DC voltage supplied from the battery pack; and a control unit configured to determine, based on a characteristic of the battery pack, whether or not the converting unit performs an outputting operation.

Abstract: A battery adapter includes an inverter device capable of converting voltage waveform from DC to AC. A first reachable battery and a second rechargeable battery different in shape can be selectively connected to the inverter device. The first rechargeable battery may, for example, a battery pack for use in an electric power tool, and the second rechargeable battery may, for example, a high-capacity lead-acid battery. With the battery adapter, two types of rechargeable batteries can be used as a power source for driving the AC-driven electric power tool. The battery adapter contains therein a microcomputer with which charge/discharge control is implemented.

Abstract: A battery charger is configured to use selective one of two or more power supplies including a commercial AC power supply and a DC power supply. An AC cable is fixedly secured to the body of the battery charger and a DC cable is detachably connected to the body of the battery charger. A single transformer is employed that has a first primary winding to which the AC power supply is connected a first switching element, a second primary winding to which the DC power supply is connected via a second switching element, and a secondary winding to which a battery pack to be charged is coupled.

Abstract: A battery pack includes a chargeable battery, a battery voltage detecting section, and a determining section. The battery voltage detecting section is configured to detect a battery voltage output from the rechargeable battery. The determining section is configured to determine a voltage level status of the rechargeable battery based on the battery voltage detected by the battery voltage detecting section. The determining section is free from determining the voltage level status when a rate of change in the battery voltage is equal to or greater than a predetermined criteria. Such a battery pack is used for a power tool.

Abstract: According to an aspect of the present invention, there is provided a battery pack to be inserted and attached to a power tool, including: a case; a battery cell accommodated inside the case; and an electrode terminal connected to the battery cell and provided on the case so as to be connectable to a tool-side electrode terminal, wherein the case includes: a case main portion; and a case sub portion which is protruded from the case main portion to be inserted into the power tool, and wherein the electrode terminal is provided on an upper surface of the case main portion at a side of the case sub portion.

Abstract: A combustion type power tool having a fan capable of providing a desirable turbulence in a combustion chamber. A fan is rotatably disposed in a combustion chamber and driven by a motor. The fan has fan blades each having a leading edge and a trailing edge. An angle of the leading edge relative to a rotational plane of the fan is approximately equal to an angle of the trailing edge relative to the rotational plane, whereby high degree of turbulence is generated from the position near the leading edge.

Abstract: A battery pack for use with a battery-driven power tool includes three battery cells in which two out of three are arranged horizontally in parallel to and in alignment with each other in a lower case and the remaining one battery cell is vertically arranged in an upper case. The upper case of the battery pack is inserted, in use, into a battery pack receiving space formed in the grip portion of a power tool. Therefore, the grip portion can be made thin and usability of the power tool is enhanced.

Abstract: The problem of the present invention is to configure a battery charger such that water intruded into a gap between a plugging portion of a battery connection part in the battery charger and a battery pack does not contact the circuit substrate, with a simple and low-cost configuration, and improving recyclability of the circuit substrate. The battery charger is configured such that water intruded from the gap between the plugging portion of the battery connection portion and the battery pack, is guided through a through-hole of a protruded portion provided at the bottom of the plugging portion to the lower side of the circuit substrate provided on the bottom case.

Abstract: A combustion-type power tool includes a housing, a cylinder head disposed at one end of the housing, a cylinder in the housing, a piston slidably disposed in the cylinder, and a driver blade connected to the piston. A combustion-chamber is provided in the housing, a fan is disposed in the combustion chamber, and a motor having an output shaft is coupled to the fan. A motor holder accommodates the motor, and the cylinder head is formed with a motor holder receiving portion in which the motor holder is slidably movably disposed. An elastic member is disposed in a gap formed between the motor holder and the motor holder receiving portion.

Abstract: A battery charger capable of improving a visibility to a light emitting display portion for facilitating recognition of a charge state of a battery. The battery charger has a housing and a display unit including the light emitting portion protruding from an outer surface of the housing.

Abstract: A main switch section is accommodated in a trigger. The trigger provided on the handle through a spring. The handle is formed with a recess to which one end of the spring is seated, so that the trigger is normally urged toward the lower side of the combustion-type nail driver. A switch accommodating portion is provided in the lower side of the canister housing. A push switch is stored in the switch accommodating portion. The push switch is a commodity type micro-switch covered with a switch protection member made from an elastic material such as a rubber.

Abstract: A combustion-powered, fastener-driving tool includes a cylinder and a combustion chamber disposed on top of the cylinder that accommodates a gaseous mixture of existing air in the combustion chamber and fuel injected therein. A spark plug generates a spark to combust the gaseous mixture in the combustion chamber. A trigger produces the spark in the spark plug when operated. A piston is movably supported in the cylinder and driven by combustion in the combustion chamber. A driving blade is coupled to the piston for driving a fastener. A spark controller is provided for generating a plurality of sparks in succession with the spark plug.

Abstract: The combustion type power tool includes a housing accommodating a combustion chamber and an ignition plug for igniting a combustion gas supplied into the combustion chamber. In the housing is defined a lithium ion battery accommodating part for causing the ignition plug to generate ignition energy. The housing includes a handle part. The lithium ion battery accommodating part is arranged at the free end of the handle part.

Abstract: A combustion-type power tool includes a housing, a head portion, a cylinder disposed in the housing, and a push lever. A piston is reciprocally movable in the cylinder, and a combustion-chamber frame is disposed in the housing and abuttable on the head portion to provide a combustion chamber in cooperation with the head portion and the piston. A fuel supplying portion supplies the fuel into the combustion chamber, a motor is disposed at the head portion, and a fan is disposed in the combustion chamber and connected to an output shaft of the motor so as to promote turbulent combustion of an air-fuel mixture. The fan and the combustion-chamber frame define a high turbulent-combustion region and a low turbulent-combustion region, a fin of one shape is located within the low turbulent-combustion region, and another fin of another shape has a part thereof located in the high turbulent-combustion region.

Abstract: A battery charger is configured to use selective one of two or more power supplies including a commercial AC power supply and a DC power supply. An AC cable is fixedly secured to the body of the battery charger and a DC cable is detachably connected to the body of the battery charger. A single transformer is employed that has a first primary winding to which the AC power supply is connected a first switching element, a second primary winding to which the DC power supply is connected via a second switching element, and a secondary winding to which a battery pack to be charged is coupled.

Abstract: A charging device includes a charging unit, a detecting unit, a determining unit, a current generating unit, an adjusting unit, and a display unit. The charging unit charges a battery. The detecting unit detects a voltage developed across the battery. The determining unit determines a charging state of the battery based on the voltage. The current generating unit generates a current. The adjusting unit adjusts the current based on the charging state. The display unit emits a first light having a first color and a first intensity in response to the current supplied thereto. The first intensity changes in accordance with changing of the current.

Abstract: A combustion-powered driving tool for driving nails or other fasteners includes a push lever, a push switch, a trigger switch, a combustion chamber, a sparkplug, and a control section. The push switch is provided for detecting that the push lever is pressed against the workpiece and outputs a first signal indicative of a pressed condition. The trigger switch is provided for instructing to drive the fastener into the workpiece. The trigger switch outputs a second signal indicative of an instruction to drive the fastener. The sparkplug is exposed in the combustion chamber and ignites a mixture of air and flammable gas in the combustion chamber to create a driving force for driving the fastener into the workpiece. The control section is responsive to the first signal and the second signal and commences an igniting operation of the sparkplug at a timing after expiration of a prescribed period of time staring from a timing at which the first signal is output from the push switch.

Abstract: A combustion-type power tool includes a housing, a cylinder, a cylinder head, a combustion chamber frame, and a rotatable fan. The combustion chamber frame including a base section, a head section abuttable on the cylinder head to provide a combustion chamber when the combustion chamber frame is at a first position, and a connection portion for connecting the head section with the base section. The fan includes fan blades which define a widthwise center line and having widthwise edge portions which define a widthwise edge line at a side of the cylinder head. The widthwise center line is offset from the connection portion toward another end of the housing, and the widthwise edge line is offset from the connection portion toward the cylinder head when the combustion chamber frame is at a second position.