Abstract: A grinder can include a stopper projection provided to a grinding stone cover and position a stopper abutting portion on a side of a gear housing in order to restrict a position adjustable range through abutment of the stopper projection to the stopper abutting portion in a position where the grinding stone cover has rotated in a rotational direction of the grinding stone by a set angle.

Abstract: One aspect according to the present invention includes a switch device for a power tool. The switch device includes a switch lever operable to move between an ON position for activating the power tool and an OFF position for stopping activation of the power tool. An on-lock mechanism can lock the switch lever in the ON position. An off-lock mechanism can lock the switch lever in the OFF position. The operation for making the on-lock mechanism effective and the operation for releasing the off-lock mechanism are performed by operating an operation member in different directions from each other or by operating two separate operation members.

Abstract: It is accordingly an object of the invention to provide a technique of cooling a power tool which further improves cooling effectiveness of the power tool. According to the invention, a power tool is provided that includes a driving motor, a tool bit, a power transmitting mechanism, a tool body and a cooling fan. The power tool further includes first and second cooling air passages. The first cooling air passage is disposed within the tool body and flows cooling air into the tool body by using the cooling fan. The second cooling air passage is provided within the tool body and takes outside air into the tool body by using the flow of the cooling air through the first cooling air passage. The cooling air within the first cooling air passage can be cooled by mixing outside air taken into the tool body via the second cooling air passage and therefore, the cooling air can further effectively cool components within the power tool. As a result, cooling effectiveness of the power tool can be improved.

Abstract: It is accordingly an object of the invention to provide a technique of cooling a power tool which further improves cooling effectiveness of the power tool. According to the invention, a power tool is provided that includes a driving motor, a tool bit, a power transmitting mechanism, a tool body and a cooling fan. The power tool further includes first and second cooling air passages. The first cooling air passage is disposed within the tool body and flows cooling air into the tool body by using the cooling fan. The second cooling air passage is provided within the tool body and takes outside air into the tool body by using the flow of the cooling air through the first cooling air passage. The cooling air within the first cooling air passage can be cooled by mixing outside air taken into the tool body via the second cooling air passage and therefore, the cooling air can further effectively cool components within the power tool. As a result, cooling effectiveness of the power tool can be improved.

Abstract: A power tool (1) includes a tool body (3) on which a battery (10) as a power source is mounted. A switch (7) is electrically connected to the battery for supplying power to a motor (6) that is disposed within the tool body. An ON lock mechanism (12,20) serves to lock the switch in an ON position. The ON lock state of the switch can be released or the switch can be turned OFF when the battery is removed from the power tool.

Abstract: A portable electric tool which miniaturizes a mold of a motor housing, reduces the costs for manufacturing the mold, extends the life of the mold, and simplifies attachment of electric equipment to a mount part of the motor housing. A flat mount part (29) extends toward the rear end of an electric tool is provided in the rear of the motor housing (5) and V-grooves (31) are provided on lateral sides of the mount part. Electric equipment to be attached to the electric too, such as a switch block (37) and a controller (39), are mounted to the top and bottom surfaces of the mount, respectively. On the bottom surface or the top surface of the electric equipment facing the surface of the mount part, engaging claws (41, 43) are provided which engages the V-grooves on the mount part. The electric equipment is attached to the mount part, by sliding forward from behind with the claws riding along the V-grooves. A rear cover (11) is added to retain the equipment.

Abstract: A power tool (1) includes a tool body (3) on which a battery (10) as a power source is mounted. A switch (7) is electrically connected to the battery for supplying power to a motor (6) that is disposed within the tool body. An ON lock mechanism (12,20) serves to lock the switch in an ON position. The ON lock state of the switch can be released or the switch can be turned OFF when the battery is removed from the power tool.