Makita Corporation

Akira Ito

Yuta Araki

Motohiro Omura

Makoto Chikaraishi

Katsuhito Fujinami

Yuta Izutsu

Kisho Sekido

Takuma Iwatani

A power tool () includes: a motor () having a stator () and a rotor (), which is rotatable relative to the stator; an output part () disposed more forward than the motor and configured to be rotated by the motor; a motor-housing part (), which houses the motor; a grip part () disposed downward of the motor-housing part; a battery-holding part () disposed downward of the grip part; and a COB light () disposed on the battery-holding part.

Power tool

A rotary tool includes a motor having an axis of rotation extending in a forward-rearward direction of the rotary tool. A grip part is located below the axis of rotation in an up-down direction that is perpendicular to the forward-rearward direction. A planet gear is configured to be driven by the motor. An internal gear meshes with the planet gear and is movable in the forward-rearward direction to change a speed. A sun gear meshes with the planet gear, and an output shaft is configured to be rotationally driven by the sun gear. A sensor is configured to detect the forward-rearward movement of the internal gear, the sensor being disposed downward of the sun gear in the up-down direction.

Driver-drill

A driver drill includes a motor housing that holds an electric motor, an axis of rotation of a rotor of the electric motor extending in a front-rear direction of the driver drill, a grip housing having an upper end connected to a lower part of the motor housing and an enlarged-part housing connected to a lower end of the grip housing and spaced from the motor housing in an up-down direction of the driver drill that is perpendicular to the front-rear direction. A torque setting of the driver drill is changeable, and the driver drill is changeable between a setting unlocked state in which the torque setting is changeable and a setting locked state in which the torque setting is not changeable.

A driver-drill () includes: a controller (), which stops rotation of a brushless motor () when a torque applied to a spindle () reaches a prescribed clutch-actuation torque; and a dial (), which is capable of specifying, to the controller (), the setting of the prescribed clutch-actuation torque within a prescribed high-low range of values. In the controller (), a relationship between clutch-actuation torques and each value in the high-low range is set such that, in a first range in which the values are low, changes in the clutch-actuation torques are the same in the low-speed mode and in the high-speed mode and such that, in a second range outside of the first range, the clutch-actuation torques in the low-speed mode are higher than in the high-speed mode.

A power tool, such as a hammer driver-drill (), includes: a motor (); a motor housing (A) that holds the motor (); a grip housing (B) connected to the motor housing (A); a battery mount housing or enlarged-part housing (C) connected to the grip housing (B); and a dial () that is provided in the enlarged-part housing (C) such that it is rotatable about a dial shaft (). A threshold for stopping the motor () is settable by rotating the dial ().

An electric working machine in one aspect of the present disclosure includes a main current-path, a driving unit including a motor and at least one first semiconductor-switching-element, a controller, a bypass current-path, a second semiconductor-switching-element, and a switch driver. The main current-path is arranged between a positive electrode and a negative electrode of a battery. The driving unit is situated in the main current path. The bypass current-path is arranged in parallel with the driving unit. The second semiconductor-switching-element is situated in the bypass current-path. The switch driver causes the second semiconductor-switching-element to interrupt the bypass current-path in an event that a voltage value of a drive voltage applied to the driving unit is less than a threshold value, and causes the second semiconductor-switching-element to complete the bypass current-path in an event that the voltage value is equal to or greater than the threshold value.

Growing community of inventors

Anjo, Japan

Akira Ito