A power tool includes a handle detector that is less susceptible to vibrations and is highly durable and reliable. A grinder includes a brushless motor, an inner housing accommodating the brushless motor, a rubber cylinder, a spindle driven by the brushless motor, and an outer housing enclosing the inner housing and holding the inner housing with the rubber cylinder in between. The outer housing includes a handle mount and at least one handle detector that detects a side handle attached.

The present invention relates to an electric handheld file tool for automatically filing down a workpiece. The electric filing tool is designed to save the time and effort associated with manually moving a file tool back and forth. A power source provides power to the motor of the device, and a linear motion is provided by a spindle to a file attachment for filing the workpiece. The spindle converts the rotational motion of the motor to reciprocating back and forth movement of the file attachment. The tool has an activation button for activating the tool, and a speed control button for controlling a speed of the file attachment. The filing tool can be used with a variety of removably attached file attachments, and can also be provided power using conventional 120-volt AC supply or battery power.

The present invention relates to an electric handheld file tool for automatically filing down a workpiece. The electric filing tool is designed to save the time and effort associated with manually moving a file tool back and forth. A power source provides power to the motor of the device, and a linear motion is provided by a spindle to a file attachment for filing the workpiece. The spindle converts the rotational motion of the motor to reciprocating back and forth movement of the file attachment. The tool has an activation button for activating the tool, and a speed control button for controlling a speed of the file attachment. The filing tool can be used with a variety of removably attached file attachments, and can also be provided power using conventional 120-volt AC supply or battery power.

An angle grinder is disclosed and includes a housing, a motor within the housing, a gearcase extending from the housing, wherein the gearcase includes a spindle and the spindle is driven by the motor, a rotating tool removable engaged with the spindle, a flange removably engaged with the spindle to secure the rotating tool on the spindle, and a flange retainer disposed on the grinder, wherein the flange retainer is configured to receive and retain the flange when the flange is disengaged from the spindle.

A wafer polishing head is provided. The wafer polishing head includes a carrier head, a plurality of piezoelectric actuators disposed on the carrier head, and a membrane disposed over the plurality of piezoelectric actuators. The plurality of piezoelectric actuators is configured to provide mechanical forces on the membrane and generate an electrical charge when receiving counterforces of the mechanical forces through the membrane. A wafer polishing system and a method for polishing a substrate using the same are also provided.

A wafer polishing head is provided. The wafer polishing head includes a carrier head, a plurality of piezoelectric actuators disposed on the carrier head, and a membrane disposed over the plurality of piezoelectric actuators. The plurality of piezoelectric actuators is configured to provide mechanical forces on the membrane and generate an electrical charge when receiving counterforces of the mechanical forces through the membrane. A wafer polishing system and a method for polishing a substrate using the same are also provided.

A grinder including a motor, a switch operated ON and OFF in accordance with an operation of a switch lever to control a rotation of an output shaft of the motor, a spindle that rotates in accordance with the rotation of the output shaft to rotate a disk-shaped grinding wheel and a brake mechanism controllable with respect to a brake plate that integrally rotates with the output shaft, in a housing, the brake plate includes fins.

A grinder including a motor, a switch operated ON and OFF in accordance with an operation of a switch lever to control a rotation of an output shaft of the motor, a spindle that rotates in accordance with the rotation of the output shaft to rotate a disk-shaped grinding wheel and a brake mechanism controllable with respect to a brake plate that integrally rotates with the output shaft, in a housing, the brake plate includes fins.

A power tool has highly airtight electrical connection between a controller and a switch to effectively prevent a short circuit. A grinder includes a housing, a motor accommodated in the housing, a controller accommodated in the housing and including a circuit board and a controller terminal located on a first facing surface and electrically connected to the circuit board, a switch accommodated in the housing and including a switch terminal located on a second facing surface facing the controller, being in direct contact with the controller terminal, and electrically connected to the controller terminal, and a seal located between the first facing surface and the second facing surface and sealing a periphery of the controller terminal and a periphery of the switch terminal with the controller terminal being in direct contact with the switch terminal. The first facing surface is a surface of the controller facing the switch.

A power tool has highly airtight electrical connection between a controller and a switch to effectively prevent a short circuit. A grinder includes a housing, a motor accommodated in the housing, a controller accommodated in the housing and including a circuit board and a controller terminal located on a first facing surface and electrically connected to the circuit board, a switch accommodated in the housing and including a switch terminal located on a second facing surface facing the controller, being in direct contact with the controller terminal, and electrically connected to the controller terminal, and a seal located between the first facing surface and the second facing surface and sealing a periphery of the controller terminal and a periphery of the switch terminal with the controller terminal being in direct contact with the switch terminal. The first facing surface is a surface of the controller facing the switch.