A covering member made of a resin is integrally molded with a sensor substrate of a brushless motor in a circular saw by low-temperature, low-pressure injection molding. The covering member covers rotation detecting elements, a thermistor, resistors, and connecting portions (terminals) of lead wires that serve as electrically conductive portions conducting electric currents.

A power tool includes: a motor; a fan driven by the motor and defining an axis and a radial direction; and a housing for accommodating the motor and the fan therein, the housing including: a peripheral wall formed with a ventilation hole; and a grid partly covering the ventilation hole, the ventilation hole being positioned adjacent to the fan and having a shape defined by a circumferential surface, the grid including at least one elongated portion extending in a longitudinal direction perpendicular to the radial direction, and a distance from the axis of the fan to the circumferential surface is different from a distance from the axis of the fan to one elongated portion in the radial direction of the fan.

A reciprocating tool includes a motor, a reciprocating member, and a crank mechanism. The motor is disposed in a housing. The reciprocating member projects from the housing. The crank mechanism converts rotation of a rotation shaft of the motor into reciprocation of the reciprocating member. The crank mechanism rotates around an axis in a lateral direction by rotation transmission from the rotation shaft, and the crank mechanism includes a crank member having an eccentric pin, a connecting rod coupling the eccentric pin to the reciprocating member, and a balancer coupled to the eccentric pin, and the balancer is supported by the eccentric pin alone in the housing.

A reciprocating tool includes a motor, a reciprocating member, and a crank mechanism. The motor is disposed in a housing. The reciprocating member projects from the housing. The crank mechanism converts rotation of a rotation shaft of the motor into reciprocation of the reciprocating member. The crank mechanism rotates around an axis in a lateral direction by rotation transmission from the rotation shaft, and the crank mechanism includes a crank member having an eccentric pin, a connecting rod coupling the eccentric pin to the reciprocating member, and a balancer coupled to the eccentric pin, and the balancer is supported by the eccentric pin alone in the housing.

A reciprocating tool includes a motor, a reciprocating member, and a crank mechanism. The motor is disposed in a housing. The reciprocating member projects from the housing. The crank mechanism converts rotation of a rotation shaft of the motor into reciprocation of the reciprocating member. The crank mechanism rotates around an axis in a lateral direction by rotation transmission from the rotation shaft, and the crank mechanism includes a crank member having an eccentric pin, a connecting rod coupling the eccentric pin to the reciprocating member, and a balancer coupled to the eccentric pin, and the balancer is supported by the eccentric pin alone in the housing.

A tool hanging system including a first tool having a first mount receiving portion and a second tool having a second mount receiving portion. A first mounting attachment is engaged with the first mount receiving portion and a second mounting attachment engaged with the second mount receiving portion. The tool hanging system further includes a wall panel. The first mounting attachment can hang on the wall panel so that the first tool is hung on the wall panel and the second mounting attachment can hang on the wall panel so that the second tool is hung on the wall panel.

A portable power drill (11) is disclosed having a chuck or drill collar (14) at one end and a substantially cylindrical (or frusto-conical) twist throttle handle (25, 125, 225) at the other end. Rotation of the handle in the direction of forward rotation of the chuck decreases the drill speed and, conversely, rotation of the handle in the direction of reverse rotation of the chuck increases the drill speed. Consequently, in the event of an auger locked in the chuck becoming jammed, the reaction forces experienced by the drill unit rotate the drill unit in a direction such that throttle decreases the drill speed. In addition, the drill unit is provided with forward (44) and reverse gears (45) and a forward/reverse selection mechanism (48, 50, 51) which is actuated by a forward force, or a withdrawing force respectively being applied to the drill unit via an operator who holds the handles (20, 25) of the drill unit.

A tool system dual rotating heads to allow for sequential operations without changing of the tool tip. The tool system is adapted to allow for complementary repetitive operations. The tool may have opposite facing rotating heads, and may be adapted to have only a selected head at any one time. The tool may include an electric drive motor which drives internal and external cleaning brushes adapted to remove oxidation and contamination from the surfaces of pipe segments before soldering, for example.

A multipurpose tool is provided. The tool including a housing having a first end and an opposing second end. A hammer portion extending from the first end, the hammer portion having at least one surface configured to strike a fastener in operation. The tool further includes a drill portion slidably disposed within the housing, the drill portion including a chuck configured to receive a drill, the chuck being positioned within the housing when in a first position and at least partially extending from the second end when in a second position.

Devices and mechanisms are disclosed for a simple ejection of the battery-pack from a power-tool with one hand only. The disclosed lock and release mechanisms primarily use one finger while the same hand of the user holds the power-tool. The claimed devices and mechanisms accept and eject two categories of batteries that either slideably attach to the bottom of the power-tool or are inserted into the handle of the power-tool.