A power tool includes a function member, a motor, a driving circuit electrically connected to the motor to drive the motor, and a first control module configured to output a first control signal to the driving circuit. The first control module has a first working state and a first failure state. The first control module outputs a first working signal when the first control module is in the first working state, and outputs a first failure signal when the first control module is in the first failure state. A second control module is electrically connected to the first control module to receive the first working signal or the first failure signal from the first control module. The second control module outputs a second control signal to turn off the motor when the second control module receives the first failure signal from the first control module.

A chain saw includes a housing, the housing including a first housing, a second housing, and a receiving cavity formed by the first housing and the second housing; a cutter including a blade chain and a blade bar for supporting the blade chain, the cutter being mounted on the housing; a power assembly, the power assembly including a drive unit for driving the cutter and a power supply unit for supplying power to the drive unit; a front handle connected to the second housing and surrounding the first housing, the front handle including a grip portion, a first and second fixing parts which are located at two ends of the grip portion, the first fixing part abutting on the side wall of the second housing, and the second fixing part being located at the bottom of the housing and connecting with the second housing.

Mobile assembly for cutting wood includes a base supported by wheels, and a plurality of posts extending upwards from the base. A frame is removably coupled to a distal post and a proximal post. The frame configured to pivot relative to at least one of the distal and proximal posts when coupled thereto, the frame configured for positioning at different heights along the at least one of the distal and proximal posts. An arm is supported by the frame, the arm configured for sliding about, and parallel to, the frame. The arm includes a chainsaw attached to a distal region of the arm.

A power tool includes a switch moveable between a first position enabling activation of a motor and a second position disabling the motor. The power tool includes a trigger movably coupled to a housing of the power tool between an OFF position and an ON position. The switch moves from the second position to the first position in response to the trigger moving from the OFF position to the ON position. The power tool includes a trigger lock-off pivotably coupled to the housing between a lock position and an unlock position. The trigger lock-off is engageable with the trigger to inhibit movement of the trigger from the OFF position to the ON position when the trigger lock-off is in the lock position. The trigger lock-off allows movement of the trigger from the OFF position to the ON position when the trigger lock-off is in the unlock position.

The disclosure provides a container, a cover and a chainsaw. The container includes a box body, a cover, a suction device, a first tube and a second tube. The box body is provided with a liquid storage cavity provided with a liquid filling opening and a liquid suction opening. The cover is detachably mounted on the liquid filling opening and is provided with a one-way ventilation structure. The suction device is arranged outside the box body. One end of the first tube is connected with the liquid suction opening, and the other end is connected with a liquid suction port of the suction device. One end of the second tube is connected with a liquid drainage port of the suction device, and the other end extends to a part to be lubricated or cooled of the cutting tool.

Disclosed is a chain saw and a power tool, including a working part, a body, a brushless motor, a power supply device, a drive circuit, a controller, and a motion detection device. The motion detection device is coupled to the body or the working part for detecting a motion of the body or the working part in at least one direction. The controller is configured to control the drive circuit to make the brushless motor enter a braking mode when the amount of the motion of the body or the working part in at least one direction exceeds a predetermined threshold.

A removably mountable abnormal motion detection device for abnormal motion detection of a power tool that includes a reactive device and a control device. The control device includes an abnormal detection system that utilizes a processor, one or more sensors; and a machine learning model trained to determine abnormal motion for the power tool. When it is determined by the control device that an abnormal motion has occurred or is about to occur in the near future, the control device communicates with the reactive device to engage a safety feature of the power tool.

The present invention provides a chain saw includes a housing, the housing including a first housing, a second housing, and a receiving cavity formed by the first housing and the second housing; a cutter including a blade chain and a blade bar for supporting the blade chain, the cutter being mounted on the housing; a power assembly, the power assembly comprising a drive unit for driving the cutter and a power supply unit for supplying power to the drive unit; a front handle connected to the second housing and surrounding the first housing, the front handle comprising a grip portion, a first and second fixing parts which are located at two ends of the grip portion, the first fixing part abutting on the side wall of the second housing, and the second fixing part being located at the bottom of the housing and connecting with the second housing.

Multi-speed automatic transmissions for power tools are provided. A multi-speed automatic transmission includes an output shaft configured to be coupled to a chain sprocket to rotatably drive the chain sprocket, wherein the automatic transmission is configured to automatically shift between a plurality of gear ratios in response to a rotational speed of the output shaft reaching a preset rotational speed.

A power tool includes a function member, a motor, a driving circuit electrically connected to the motor to drive the motor, and a first control module configured to output a first control signal to the driving circuit. The first control module has a first working state and a first failure state. The first control module outputs a first working signal when the first control module is in the first working state, and outputs a first failure signal when the first control module is in the first failure state. A second control module is electrically connected to the first control module to receive the first working signal or the first failure signal from the first control module. The second control module outputs a second control signal to turn off the motor when the second control module receives the first failure signal from the first control module.