Abstract: In order that the output voltage of a battery pack can be switched and the battery pack can be shared among different voltage electric appliances, this battery pack has a switching mechanism that switches outputting a low voltage by parallel connection of two cell units or outputting a high voltage by series connection of the two cell units, said two cell units each being composed of a plurality of cells connected in series, wherein the switching mechanism is configured from a change-over switch having an operation lever (452). The change-over switch is embedded in a battery pack (400), and an operator is able to manually switch outputting 18 V by setting the operation lever (452) at a first position or outputting 36 V by setting the operation lever (452) at a second position.

Abstract: A work machine according to the present invention optimally collects work chips, such as dust, produced during work. In a circular saw 10, a sawdust discharge port 27H and a cover opening 27J are formed in an inner cover 27, and a dust collecting chamber inlet 62L1 and a dust collecting chamber outlet 62L2 are formed in a dust collecting case 60. Furthermore, at least a portion of the dust collecting chamber inlet 62L1 and at least a portion of the dust collecting chamber outlet 62L2 are arranged at the same position in the vertical direction.

Abstract: The electrical device comprises a common device main body having selectively and detachably attached thereto either a variable-voltage power supply device or a high-voltage power supply device. The device main body has: a protruding section that abuts a power supply-side main erroneous attachment prevention section provided in the variable-voltage power supply device and the high-voltage power supply device; a device-side main erroneous attachment prevention section that abuts the power supply-side main erroneous attachment prevention section provided in a low-voltage power supply device and prevents the low-voltage power supply device from abutting an attachment positioning section; and a device-side attachment permitting section that can be combined in a power supply-side auxiliary erroneous attachment prevention section provided in the high-voltage power supply device.

Abstract: Provided is a rotary tool. In the rotary tool, the rotating tip tool is mounted on a spindle by the fixture, and the spindle and the tip tool are rotated by a motor. The rotary tool has a switch which can switch the motor between a rotation state and a stop state, and a control device which controls the rotation of the motor corresponding to the operation of the switch. When the switch is turned off after a required time T elapses after the motor is started, the control device stops the rotary tool (104d, 106d) by performing a common braking operation on the spindle, and when the switch is turned off before the required time T elapses after the motor is started, the control device stops the tip tool (101d) by inertia without applying a braking force.

Abstract: An electric device is provided which can reduce risk of malfunction. This electric device is provided with a motor (31), an inverter circuit (30) which has switching elements (S1-S6) and which drives the motor (31), and a charge pump circuit (22) which generates the drive voltage of the switching elements (S1-S6). A discharge circuit (a discharge resistor R and a capacitor C1) is provided between a power line to which a drive voltage (VM) of the motor (31) is supplied and an output terminal (a VGT terminal) of the charge pump circuit (22). Energy of the surge voltage (Vs) generated in a parasitic inductance (Ls) when the switching elements (S4-S6) are turned off is absorbed by the discharge circuit (the discharge resistor R and the capacitor C1).

Abstract: A battery pack having a first cell unit and a second cell unit in which multiple battery cells are connected in series is provided. When the battery pack is not connected to an electric apparatus main body, the first cell unit and the second cell unit are in a non-connection state in which the first cell unit and the second cell unit are not electrically connected to each other. The battery pack includes: a microcomputer, connected to one of the first cell unit and the second cell unit; a residual quantity display portion, connected to the microcomputer and displaying a battery residual quantity of the battery pack; and a switch, being operated by a worker. When the switch is operated while in the non-connection state, the microcomputer is configured to perform a light-on control to display the battery residual quantity by the residual quantity display portion.

Abstract: An electrical equipment system includes electrical equipment, a battery pack with a wireless communication function which is mounted to the electrical equipment, and a portable terminal wirelessly communicable with the battery pack. The electrical equipment includes a drive part, a control part which controls the drive part, an operation part which instructs start and stop of the drive part, and a storage part which stores operation parameters for driving the drive part. Various operation parameters, such as an operation amount of the operation part for starting the drive part of the electrical equipment, are configured to be changeable by a management application installed in the portable terminal.

Abstract: The present invention achieves an electric device system having: a low/intermediate-voltage battery pack 201 capable of outputting a low voltage (18 V) or an intermediate voltage (36 V); an intermediate/high-voltage battery pack 301 capable of outputting the intermediate voltage or a high voltage (72 V); a low-voltage device main body 1 configured to be connected to the low/intermediate-voltage battery pack and supplied with the low voltage; an intermediate-voltage device main body 31 configured to be connected to the low/intermediate-voltage battery pack and the intermediate/high-voltage battery pack and supplied with the intermediate voltage; and a high-voltage device main body 61 configured to be connected to the intermediate/high-voltage battery pack and supplied with the high voltage.

Abstract: This driving tool includes: a pressure accumulator (26) in which a compressible gas is accumulated; a striking part which operates in a first direction to strike a fastener with a pressure of the compressible gas; and a driving part which causes the striking part to operate in a second direction opposite to the first direction and to increase the pressure of the pressure accumulator (26). The driving tool further includes: a cylinder chamber (98) in which the compressible gas to be supplied to the pressure accumulator (26) can be contained; a holder (44) forming the pressure accumulator (26) and the cylinder chamber (98); a piston (97) which is disposed in the holder (44) and is operable to reduce the volume of the cylinder chamber (98); and a switching valve (92) capable of connecting and disconnecting the cylinder chamber (98) and the pressure accumulator (26).

Abstract: Provided is an electric tool with which work efficiency can be improved. A controller of an electric tool can execute: a first control, whereby during a non-operating state after a motor has started up and before a tip tool is set to be in an operating state, the motor is driven at a slow idling rotation speed, and when the tip tool is set to be in the operating state, the motor is driven at a normal rotation speed which is higher than the slow idling rotation speed; and a second control, whereby in a case where a trigger switch has been turned off in a state where the motor is being driven at the normal rotation speed and the trigger switch is thereafter turned on again under a prescribed condition, the motor is driven at the normal rotation speed regardless of the state of the tip tool.

Abstract: There is provided a driving machine capable of reducing a load applied to a guide member in a direction of a center axis. The driving machine drives a fastener into a workpiece. The driving machine includes a movable piston, a driver blade operating together with the piston and applying driving force to the fastener, a cylinder guiding operation of the piston, a holder provided in a housing and supporting the cylinder, and a vibration damping rubber interposed between the holder and the housing and receiving a load applied to the holder in an operational direction of the piston.

Abstract: A driving tool having a striking unit and a driver unit includes a solenoid configured to switch between a first state and a second state by being actuated by the supply and stop of the electric power, wherein the driver unit has a first drive state in which the striking unit can be actuated and a second drive state in which the actuation of the striking unit is blocked, wherein the first state enables the driver unit to switch from the second drive state to the first drive state and the second state blocks the driver unit from switching from the second drive state to the first drive state, and wherein an actuation direction of the solenoid and the moving direction of the nail are arranged so as to intersect each other.

Abstract: The disclosure provides a driving tool. The driving tool includes an ejection part, a pressure accumulator, a striking part, a driving part, and a housing. The driving tool includes a cylinder forming at least a part of the pressure accumulator, and a piston formed in the striking part. The driving part and a wire material are entirely disposed outside, in the radial direction of the cylinder, a region in which the piston is arranged, and outside a region in which the piston slides in an operating direction of the striking part with respect to the cylinder.

Abstract: A battery pack which has cell units in which top-side and bottom-side battery cells are connected in series, and is capable of switching the connection state of the cell units, wherein a control unit monitors voltage imbalances between the plurality of cell units, and also monitors whether or not a cell unit contact failure has occurred. In order to stop a charging/discharging when a contact failure occurs, a signal (abnormality stoppage signal or charging stoppage signal) for stopping discharge is produced and outputted to the electrical device body-side.

Abstract: Providing a reciprocating tool capable of reducing vibrations generated during operations and improving work performance and processing precision. A reciprocating tool includes a transmission gear part 61 and a counter weight part 62. The transmission gear part 61 includes a bevel gear 611 and a weight 611A. The bevel gear 611 is rotatable in a first direction about an axis B by receiving a drive force of a motor 3. The weight 62A is rotatable in a second direction opposite to the first direction about the axis B by receiving the drive force of the motor 3. A center of gravity 61G of the transmission gear part 61 and a center of gravity 62G of the counter weight part 62 are separated farthest from a blade mounting part 8 when the blade mounting part 8 is positioned in a rearward position.

Abstract: Provided is a work machine with improved operatability. In a cutting tool, a guard member that is made of metal is provided inside a chip discharge passage section, and a bottom wall of the chip discharge passage section on a saw blade side is covered by the guard member. In other words, a bottom surface of the chip discharge passage section is guarded by the guard member that is made of metal. Accordingly, the guard member can prevent high-temperature metal chips from coming into direct contact with the bottom wall of the chip discharge passage section. Thus, deformation of the chip discharge passage section when chips pass through the chip discharge passage section can be suppressed. Consequently, the durability of a saw cover can be increased, and the operatability of the cutting tool can be improved.

Abstract: An electric tool includes a housing; a brushless motor, housed in the housing; an output shaft configured to hold a tip tool; a switching circuit controlling the brushless motor; a circuit board; a case, accommodating the circuit board, the case is filled with a resin, wherein the resin covers at least a part of the circuit board; the housing includes a motor housing element and a cover element covering at least a part of the case. The motor housing element includes a motor housing part accommodating the brushless motor, and a fixing part, configured to fix the case to the motor housing by the fixing part abutting the case.

Abstract: An impact tool includes a hammer that is rotated by a motor and energized toward a front side from a spindle by a cam mechanism and a spring, and an anvil that is struck by the hammer. The hammer includes a main body part, and claw parts extending forward from the main body part, and tapered surfaces are formed such that an inner diameter side end of each of the claw parts of the main body part is located on the front side relative to an outer diameter side end of the claw part. The tapered surfaces are formed, on an outer peripheral side of a front facing surface of the hammer, in such a shape that the tapered surfaces recede as separating in a radial direction from a rotation axis.

Abstract: The electric tool including a motor having a stator and a rotor, a rotation shaft integrally rotating with the rotor, a casing accommodating the motor, a ventilating window disposed in the casing, a cooling fan sucking an air through the ventilating window to cool off the motor, a magnetic body disposed to the rotation shaft, a magnetic detection unit detecting a rotational position of the magnetic body, and a circuit substrate on which the magnetic detection unit is mounted. The circuit substrate and the magnetic body are disposed to be isolated from a wind path of a cooling wind generated by rotation of the cooling fan.

Abstract: A cutting tool 10 comprises a housing 30, and a handle 50 connected to the housing 30. The handle 50 comprises: a grip part 51; a first connection part 52 extending from one end of the grip part 51 toward a front side and fixed to a main body housing 32 of the housing 30; and a second connection part 53 extending from the other end of the grip part 51 toward the front side and fixed to the main body housing 32. Thus, a loop structure S is formed by the housing 30 and the handle 50. Then, a battery pack 100 to be attached to a battery attachment and detachment part 42 of a motor housing 40 is disposed in the loop structure S.