Abstract: The invention relates to a power tool and battery pack assembly including a battery pack for connection with the power tool to provide power for the operation of the power tool when connected thereto. The battery pack includes a plurality of power cells and connection means are provided to allow the selective supply of power at least a first or second voltage level to the power tool from the battery pack.

Abstract: One or more sensors are provided on a battery pack side and sensor information is transmitted from the battery pack side to an electrical device main body side to enable a control part of an electrical device main body to perform control using the sensor information. Sensors are provided at a battery pack to collect and output physical information that arises due to external factors. A control part of the battery pack transmits, to the electrical device main body side, signals detected by the sensors directly or after adding up the signals. The control part of the electrical device main body controls operation of the electrical device main body by using the sensor information acquired via a signal terminal.

Abstract: A driving device includes an operable striking unit, a piston upper chamber configured to operate the striking unit by gas pressure, a housing, a head cap provided in the housing, a passage provided in the head cap, and an exhaust valve operably provided in the housing and configured to open and close the passage. The exhaust valve includes a contact portion and a non-contact portion, the contact portion comes into and out of contact with the head cap on an outer side of the passage in a radial direction of the passage, the non-contact portion is provided on an inner side of the contact portion in the radial direction of the passage, and the non-contact portion is provided at a position separated from the head cap in a state where die contact portion is in contact with the head cap.

Abstract: The present invention improves workability. A cutting work machine has a discharge channel, concave with a discharge opening open to the left, disposed at an outer peripheral portion of a saw cover. A discharge inlet portion that connects the saw cover and the discharge channel are formed at a front end of the discharge channel. Viewed from above, a side guide surface constituting the right-side surface of the discharge channel inclines to the left toward the rear. The rear surface of the discharge channel consists of a rear guide surface inclined to the rear toward the left side. Thus, cutting chips flowing towards the rear-end side of the discharge channel along the side guide surface hit the rear guide surface and changes the chip outflow direction to the left side (discharge opening side). With cutting chips being discharged substantially leftward from the discharge opening, the workability of the cutting work machine improves.

Abstract: The present invention improves workability. In a circular saw, a protrusion-amount-adjusting mechanism includes a lever-biasing spring, and the lever-biasing spring energizes a fixing nut and an operation lever toward a tip end side (i.e., the direction away from a link) of a fixing bolt. Thus, the state of the fixing nut configured at the non-fixed position may be retained well. That is, the separation state of the fixing nut and the operation lever from the link may be retained well. In this way, in the fixing release state of the circular saw body and the base, when the circular saw body is rotated relative to the base, the fixing nut and the operation lever may be prevented from sliding on the link. Thus, workability when adjusting the protrusion amount of the circular saw blade may be improved.

Abstract: An electrical apparatus includes a battery pack, an electrical apparatus main body and a control unit. The battery pack has a plurality of cell units of which connection states are able to be switched and a plurality of battery side connection terminals. The electrical apparatus main body has a battery pack mounting portion to which the battery pack is mounted, a plurality of device side connection terminals to which the plurality of battery side connection terminals are connectable, and a load device to which power is supplied from the battery pack. The control unit is configured to stop or limit power supply from the battery pack to the load device when a voltage imbalance is generated between the plurality of cell units or a contact failure is generated between the plurality of battery side connection terminals and the plurality of device side terminals.

Abstract: A working tool includes a magazine unit in which a plurality of connected fasteners are stored in a rolled shape, an ejection unit to which the fastener is fed, a driver blade configured to strike the fastener held in the ejection unit to one side in a first direction, an electric motor configured to drive the driver blade by receiving an electric power, a feeder unit capable of moving in a second direction crossing the first direction and configured to feed the fastener stored in the magazine unit to the ejection unit by moving to one side in the second direction, a solenoid configured to drive the feeder unit by receiving an electric power, and a control unit configured to allow the solenoid to drive when a load of the electric motor satisfies a first condition.

Abstract: In a battery pack and an electrical device, one or more sensors are provided at a battery pack side, and sensor information acquired on a battery side is used to control an electrical device main body. Sensors that collect and output physical information arising due to external factors are provided at a battery pack, and a control part of the battery pack processes signals detected by the sensors and creates a control signal compatible with a mounted electrical device main body. The control part of the battery pack transmits, to the electrical device main body, a signal for controlling the electrical device main body via a communication terminal to enable a control part of the electrical device main body to perform optimal control using sensor information.

Abstract: Realized is a driving device capable of controlling driving timing of a blade and driving timing of a feeder independently. The driving device of the present invention has a housing having an injection path, a blade hitting a nail supplied to the injection path, an electric motor, a controller controlling drive of the electric motor, a magazine accommodating connected nails, and a supply, mechanism sequentially supplying the connected nails, which are accommodated in the magazine, to the injection path. The supply mechanism has a reciprocable feeder backward and forward, an energizing member energizing the feeder forward, and a stopper holding a position of the backward moved feeder against energization of the energizing member. Then, holding the position of the feeder by the stopper is released based on control of the controller.

Abstract: A battery pack is provided with: a battery cell; a control part connected to the battery cell; and a wireless communication part connected to the control part and configured to communicate wirelessly with an external device by means of the control part. The wireless communication part wirelessly connects to an electric device having a motor or to an information terminal as the external device for connection. During the wireless connection, priority connection control is performed to connect to the electric device in a wirelessly connectable state.

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: Provided is a battery pack and an electric device. The battery pack has a first circuit part connecting a positive electrode of an upper side cell unit and a power supply circuit, and a second circuit part connecting a negative electrode of a lower side cell unit and the circuit. In series connection state, a closed loop is formed by a positive electrode of the lower side cell unit, a lower side plus terminal, a shorting bar of a 36V device body, an upper side minus terminal, a negative electrode of the upper side cell unit, the positive electrode of the upper side cell unit, a diode, the circuit, and the negative electrode of the lower side cell unit. The circuit generates a power supply voltage using the series output voltage (36V) of the upper side and the lower side cell unit, and supplies the voltage to a control unit.

Abstract: Provided are a battery pack and an electrical device with improved cooling properties of battery cells. A bottom case 3 has a plurality of outer fins 13 on the bottom surface thereof. The bottom case 3 has contact portions 15 on an inner surface section on the side opposite from the plurality of outer fins 13. The contact portions 15 have an arc-like curved surface shape which is curved along the outer surface of first battery cells 4 not covered by a separator 6, and the contact portions make direct surface contact with the outer surface of the first battery cells 4 to support the outer surface. Each of the outer fins 13 is a planar portion perpendicular to the left-right direction, and extends downward from the rear surface of the contact portion 15. The plurality of outer fins 13 are arranged side by side in the left-right direction.

Abstract: In an impact wrench, a speed reduction mechanism includes a carrier part integrally formed at a rear end part of a spindle and a planetary gear rotatably supported on the carrier part, and the planetary gear is engaged with a pinion gear of a motor. Moreover, the speed reduction mechanism includes a bearing that rotatably supports the carrier part, and the bearing is configured on a radially outer side of a drive shaft of the motor with respect to the planetary gear. Thus, when compared to a configuration in which the carrier part is rotatably supported by the bearing configured on the front side or the rear side of the planetary gear, the size of the speed reduction mechanism in the front-rear direction is miniaturized, and in turn, the size of the impact wrench in the front-rear direction is miniaturized.

Abstract: A battery pack and an electric apparatus are provided. The battery pack is configured to be connectable to an electric apparatus main body of the electric apparatus. The battery pack includes: a first cell unit, including a first plurality of battery cells connected to each other, a first positive terminal, and a first negative terminal; a second cell unit, including a second plurality of battery cells connected to each other, a second positive terminal, and a second negative terminal; a microcomputer; and a casing, accommodating the first cell unit, the second cell unit, and the microcomputer. The first cell unit and the second cell unit are configured to be switched a connection state each other. The microcomputer is configured to be electrically connected to a positive terminal and a negative terminal of one of the first cell unit and the second cell unit and to be provided a power from the one of the first cell unit and the second cell unit.

Abstract: Provided is a driver configured to be capable of filling gas suitable for a set pressure of a pressure chamber. This driver is provided with: a pressure chamber into which gas is filled; a striker moved in a first direction by pressure within the pressure chamber to strike nails; and an electric motor and a pin wheel, which move the striker in a second direction opposite to the first direction to increase the pressure within the pressure chamber. A pressure regulator for regulating the pressure of the gas filled into the pressure chamber is dedicated for the driver, and the driver is provided with a mounting hole for the pressure regulator.

Abstract: A power tool includes a prime mover, an output shaft that extends along a first direction and retains a tip tool and is driven by the prime mover, a support member that supports the output shaft to be drivable, a gear that rotates around an axis extending in a second direction crossing the first direction and transmits a power of the prime mover to the output shaft, and a gear cover that accommodates the gear and the support member. Inside the gear cover, a lubricant retention portion capable of retaining a lubricant is arranged at a side of the support member, and the lubricant retention portion is partitioned from a gear accommodation portion that accommodates a gear by a wall extending in a direction intersecting an extending direction of the output shaft in the gear cover.

Abstract: A driver capable of suppressing an increase in a load of a bumper is provided. The driver includes a striking portion provided movably and configured to move to strike a fastener; a bumper configured to be in contact with the striking portion to restrict a range of movement of the striking portion; and a housing configured to support the bumper, the driver further including a load suppressing portion configured to suppress an increase in a load of the bumper based on the load of the bumper detected by a load detection portion or number of operations of the striking portion within a predetermined time.

Abstract: An electric tool is provided which enables preventing adherence to a rotor core of dust, such as iron powder, that has entered a motor. The electric tool includes a cylindrical motor housing 10 accommodating and supporting the motor, and a cooling fan attached to a rotation shaft of the motor, and cools the motor by flowing air generated by the cooling fan toward the back or front of the motor housing 10, wherein a fan guide 50 guiding cooling air is provided in front of an insulator 35 of a stator 30 of the motor. The fan guide 50 includes a first cylindrical part 51 which covers a rotation space of the cooling fan, a guide surface 53, and a second cylinder 55 which extends backward from the guide surface 53, wherein a labyrinth space 39 is formed by the insulator 35 and the second cylinder 55. By providing the labyrinth space 39, it is possible to block the flow of cooling air from the outer peripheral side of the stator 30 to an opening 53a.