A trigger switch TS includes a trigger 1 receiving a press through an operation of an operator to be movable to a deepest position in a press direction. The trigger includes: a base shaft member 11, to which a trigger cap 10 is removably attached; and a limiting member 14, supported by the base shaft member to be operable, and able to limit a movement of the trigger. In the trigger where the trigger cap 10 is attached to the base shaft member, if a first press is received, the movement is limited at a limited position not arriving at the deepest position through the limiting member in a limited state. With removal of the received first press, the limiting member transitions to from the limited state to an unlimited state and, if a second press is received following the removal, it is possible to move to the deepest position.

A terminal connection structure has a housing, a base housed in the housing, and a terminal unit having a pair of tab terminals disposed on the base, a pair of terminal portions disposed in the tab terminals in parallel, each of which is exposed from the housing and configured to be connected to an external terminal, and a terminal plate sandwiched between the pair of tab terminals.

A switch (30) for a hand-held power tool (10) or as a component of a hand-held power tool (10), which has an electric drive motor (16) that can be switched by the switch (30). The switch (30) has a switch housing (33) with a switch chamber (35) in which a switch actuator (75) that can be moved between at least two switch positions (ML, MR) is arranged in order to actuate an electric switch element, said switch actuator being kinetically coupled, by means of a transmission element (70), to a switch (30) actuation element (32), which is arranged outside the switch housing (33) and can be moved between at least two actuation positions (R, L), wherein the transmission element (70) passes through a through-opening (54) on a wall of the switch housing (33) such that the switch actuator (75) can be moved by moving the actuation element (32) in order to actuate the switch element (24). A rotary bearing (77) is arranged in the through-opening (54), the transmission element (70) being rotatably mounted on the rotary bearing about a rotational axis (D).

A powered surgical tool with a switch for regulating tool operation. A pair of opposed arms extend outwardly from opposed sides of the switch. The arms move between safety and run states. When the arms are in the safety state, the arms engage a static surface to prevent movement of the switch. When in the arms are in the run state the arms are spaced from the static surface so movement is allowed. The arms are connected together so that the movement of one arm results in simultaneous movement of the other arm.

A grasp-activated power switch has a switch body, an outer conductive shell covering the switch the body, and a tool body. The switch body has an open-ended channel. An upper and lower conductive band are formed about the inner surface of the channel and are electrically separated from one another. An outer conductive band on the outer surface of the switch body is electrically coupled to the upper band. An outer conductive surface on the outer surface of the switch body is electrically coupled to the lower band. The tool body is electrically separated from the inner surface of the channel and includes a first and a second pin extending inwards. One of the pins is coupled to a motor and the other pin is coupled to a battery so that a manual grasping force applied to the outer shell completes the electrical connection to energize the motor.

Systems and methods for controlling a power trowel. A power trowel includes a handle including a speed control input, a housing, a shaft connecting the handle and the housing, a safety mechanism located on the shaft, a blade assembly positioned below the housing, a motor located within the motor housing and coupled to the blade assembly, and a controller. The safety mechanism includes a safety lever configured to move in response to an uncontrolled condition of the power trowel. The controller is connected to the motor and the safety mechanism. The controller is configured to drive, in response to actuation of the speed control input, the motor, detect a movement of the safety lever from a first position to a second position, and perform, in response to the movement of the safety lever to the second position, a safety operation.

Systems and methods for controlling a power trowel. A power trowel includes a handle including a speed control input, a housing, a shaft connecting the handle and the housing, a safety mechanism located on the shaft, a blade assembly positioned below the housing, a motor located within the motor housing and coupled to the blade assembly, and a controller. The safety mechanism includes a safety lever configured to move in response to an uncontrolled condition of the power trowel. The controller is connected to the motor and the safety mechanism. The controller is configured to drive, in response to actuation of the speed control input, the motor, detect a movement of the safety lever from a first position to a second position, and perform, in response to the movement of the safety lever to the second position, a safety operation.