Abstract: A rotary tool (10) having a plurality of switchable modes is provide with a trigger (19) and a switching lever (20) disposed around a grip (13) for selecting a rotational direction of a motor (31). The switching lever (20) is operated between a forward rotation state, a reverse rotation state, and a neutral state. A switching of the modes is executed when the switching lever (20) is positioned in the neutral state and the trigger (19) is pulled.

Abstract: An electric power tool is provided with: a motor; a hydraulic pressure generator driven by the motor and configured to generate a plurality of impacts in one revolution thereof; an impact angle detector configured to detect an impact angle in one impact of the hydraulic pressure generator; an electric current detector configured to detect an electric current applied to the motor; a determination unit configured to determine an impact failure based on the impact angle and the electric current detected by the impact angle detector and the electric current detector; and a rotation controller configured to decrease a rotation speed of the motor when the determination unit determines the impact failure.

Abstract: A locking mechanism of a battery pack A is provided with a hook 14 which can be locked to a mounting part B of an object equipment such as an electric tool in a state slid with respect to the mounting part, and operation parts 16 for releasing the lock which are linked to the hook 14, on a case which contains a battery. The hook 14 is urged to move upward by an elastic body in a direction of being locked to the mounting part B. The operation parts 16 are arranged in both side parts of the case within such a range that they can be grasped with a single hand from both sides of a backward end in the sliding direction of the case. When the operation parts 16 are operated from the both sides, the lock between the hook 14 and the mounting part B is released against the urge by the elastic body.

Abstract: An electric power tool is provided with: a motor; a hydraulic pressure generator driven by the motor and configured to generate a plurality of impacts in one revolution thereof; an impact angle detector configured to detect an impact angle in one impact of the hydraulic pressure generator; an electric current detector configured to detect an electric current applied to the motor; a determination unit configured to determine an impact failure based on the impact angle and the electric current detected by the impact angle detector and the electric current detector; and a rotation controller configured to decrease a rotation speed of the motor when the determination unit determines the impact failure.

Abstract: A handheld tool includes a first power source, a second power source having a characteristic different from a characteristic of the first power source, and an operation part which is operated by a power from at least one of the first power source and the second power source to fasten a fastener.

Abstract: In a core bit formed with a drill portion in a cylindrical shape formed with a boring blade on one end side thereof and a mounting portion in a cylindrical shape mounted to a chuck portion of a concrete drill on other end side of the drill portion, formed with an engaging portion capable of being engaged with an engaging portion on a side of the chuck portion at an outer peripheral face of the mounting portion for transmitting rotation of a side of the concrete drill via the engaging member, the outer peripheral face of the mounting portion on a side of the boring blade of the engaging member is formed with a flange portion in a shape of a flange having a diameter larger than an outer diameter of the engaging member.

Abstract: A locking mechanism of a battery pack A is provided with a hook 14 which can be locked to a mounting part B of an object equipment such as an electric tool in a state slid with respect to the mounting part, and operation parts 16 for releasing the lock which are linked to the hook 14, on a case which contains a battery. The hook 14 is urged to move upward by an elastic body in a direction of being locked to the mounting part B. The operation parts 16 are arranged in both side parts of the case within such a range that they can be grasped with a single hand from both sides of a backward end in the sliding direction of the case. When the operation parts 16 are operated from the both sides, the lock between the hook 14 and the mounting part B is released against the urge by the elastic body.

Abstract: A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) contained in the main body (1) in which the main body (1) is provided with a vibrating apparatus (8) for exerting a vibrating force a magnitude which is pulsated to change along the bit drive shaft (4) to the main body (1).

Abstract: In a core bit formed with a boring blade at a front end thereof and integrally formed with a mounting portion, at a rear end portion thereof, formed with a guide portion in a cylindrical shape mounted to a chuck portion formed at a concrete drill, a ring-like seal member forming a seal between the mounting portion and a side of the chuck portion is formed at the guide portion in the cylindrical shape of the core bit.

Abstract: A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) contained in the main body (1) in which the main body (1) is provided with a vibrating apparatus (8) for exerting a vibrating force a magnitude which is pulsated to change along the bit drive shaft (4) to the main body (1).

Abstract: A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) contained in the main body (1) in which the main body (1) is provided with a vibrating apparatus (8) for exerting a vibrating force a magnitude which is pulsated to change along the bit drive shaft (4) to the main body (1)

Abstract: In a core bit formed with a drill portion in a cylindrical shape formed with a boring blade on one end side thereof and a mounting portion in a cylindrical shape mounted to a chuck portion of a concrete drill on other end side of the drill portion, formed with an engaging portion capable of being engaged with an engaging portion on a side of the chuck portion at an outer peripheral face of the mounting portion for transmitting rotation of a side of the concrete drill via the engaging member, the outer peripheral face of the mounting portion on a side of the boring blade of the engaging member is formed with a flange portion in a shape of a flange having a diameter larger than an outer diameter of the engaging member.

Abstract: In a core bit formed with a boring blade at a front end thereof and integrally formed with a mounting portion, at a rear end portion thereof, formed with a guide portion in a cylindrical shape mounted to a chuck portion formed at a concrete drill, a ring-like seal member forming a seal between the mounting portion and a side of the chuck portion is formed at the guide portion in the cylindrical shape of the core bit.

Abstract: A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) contained in the main body (1) in which the main body (1) is provided with a vibrating apparatus (8) for exerting a vibrating force a magnitude which is pulsated to change along the bit drive shaft (4) to the main body (1).

Abstract: A bonding member 1 comprising a metallic plate 2 formed as a small piece onto which a hot melt adhesive layer 3 is formed at least one side of said metallic plate 2, and a gypsum board mounting method for mounting a gypsum board 5 using the bonding member 1, comprising: fixing said bonding member 5 temporarily; pushing said gypsum board 5, heating the metallic plate 2 with electromagnetic induction to melt said hot melt adhesive layer 3; and thereby allowing the gypsum board 5 to be bonded easily without noise. The bonded gypsum board 5 can be recycled because it can be peeled off easily with melting the adhesive layer 3 without damage of the board.