Abstract: A chainsaw may include: a guide bar; a saw chain; a sprocket; a prime mover; and a depth limiter. The depth limiter may include: a first component including a first plate arranged along a first surface of the guide bar and a first engagement portion disposed on the first plate; and a second component including a second plate arranged along a second surface of the guide bar and a second engagement portion disposed on the second plate. The first engagement portion and the second engagement portion may be engaged with each other such that each of the first component and the second component is attached to the guide bar. The first engagement portion and the second engagement portion may be disengaged from each other such that at least one of the first component and the second component is detached from the guide bar.

Abstract: A working machine may include: a working part; an electric motor; a control device; a housing; an inlet; an outlet; a cooling air passage; and a fan configured to generate cooling air which flows from the inlet through the cooling air passage to the outlet. The control device may include a first surface and a second surface. The cooling air passage may include a first passage portion facing the first surface and a second passage portion facing the second surface. The cooling air may flow through the first passage portion and then the second passage portion. A flow rate of the cooling air flowing through the first passage portion and a flow rate of the cooling air flowing through the second passage portion may be substantially equal to each other.

Abstract: A screw-fastening tool having a continuously-variable transmission traction drive includes a continuously-variable transmission, a thrust cam mechanism of the continuously-variable transmission and a clutch plate of a fastening torque setting mechanism arranged in series between an electric motor and a spindle. A traction grease having a high traction coefficient is used as a lubricant for a traction drive. A grease reservoir or felt members in sliding contact with oppressing parts are disposed in a transmission case.

Abstract: A technique for providing a user with effective information in performing an operation is provided in a power tool having a speed change mechanism. A power tool has a speed change mechanism that switches a tool bit 113 from first drive mode in which the tool bit is driven at high speed and low torque to second drive mode in which the tool bit is driven at low speed and high torque, according to load on the tool bit 113. The power tool includes detecting and indicating device 161, 163, 167 that detect a predetermined status condition of the first drive mode and indicate switching from the first drive mode to the second drive mode before switching to the second drive mode.

Abstract: A screw-fastening tool having a continuously-variable transmission traction drive includes a continuously-variable transmission, a thrust cam mechanism of the continuously-variable transmission and a clutch plate of a fastening torque setting mechanism arranged in series between an electric motor and a spindle. A traction grease having a high traction coefficient is used as a lubricant for a traction drive. A grease reservoir or felt members in sliding contact with oppressing parts are disposed in a transmission case.

Abstract: A technique for providing a user with effective information in performing an operation is provided in a power tool having a speed change mechanism. A power tool has a speed change mechanism that switches a tool bit 113 from first drive mode in which the tool bit is driven at high speed and low torque to second drive mode in which the tool bit is driven at low speed and high torque, according to load on the tool bit 113. The power tool includes detecting and indicating device 161, 163, 167 that detect a predetermined status condition of the first drive mode and indicate switching from the first drive mode to the second drive mode before switching to the second drive mode.