A trigger switch may include a first urging member urging a trigger, a shaft including a first end attached to the trigger, a first movable member connected to a second end of the shaft, a second movable member , a second urging member located between the first movable member and the second movable member, and a contact portion to be in contact with the second movable member moved in a depressing direction. In response to a depressing operation on the trigger, the first movable member, the second movable member, and the second urging member move in the depressing direction until the second movable member comes in contact with the contact portion. The first urging member urges the trigger. In response to an additional depressing operation on the trigger with the second movable member in contact with the contact portion, the first movable member moves in the depressing direction, and the second urging member urges the first movable member.

A trigger switch according to one or more embodiments may include a pressure sensor such as a pressure sensitive element that detects a depressed amount of a trigger in response to a depressing operation on the trigger. A trigger switch may include a trigger movable in response to a depressing operation, an urging member including a first end in contact with the trigger and a second end and urging the trigger in a direction opposite to a depressing direction in which the trigger is depressed, an elastic member in contact with the second end of the urging member, and a pressure sensor in contact with the elastic member to detect pressure applied from the elastic member.

A key switch including: a support base; a key which is manually operable for being moved, with respect to the support base, between at least a first operating position and a second operating position spaced apart from each other, in order to establish or interrupt at least one electric connection; a leaf spring member operatively interposed between the support base and the key; wherein the first operating position is a stable operating position of the key in which the leaf spring member is deformed between the key and the support base so as to take a first curvilinear configuration.

A trigger assembly for a power tool includes a housing, a moveable plunger extending from a surface of the housing, the movable plunger includes a first end disposed externally from the housing and a second end disposed internally within the housing. The trigger assembly further includes a trigger shoe coupled to the first end of the moveable plunger, and an arm including a first side that is moveably connected to the second end of the moveably plunger and a second side that is coupled to a magnet. The trigger assembly also includes a sensor configured to sense a magnetic field of the magnet. Movement of the trigger shoe rotates the magnet, and alters the magnetic field sensed by the sensor.

A switch assembly, a switch assembly starting method and a power tool are provided. The switch assembly includes a housing, a main control switch accommodated in the housing, a locking switch and a trigger switch arranged on the housing. An end of the trigger switch is accommodated in the housing and is in contact with the main control switch. An end of the locking switch is in contact with the trigger switch. The locking switch has a locking position and a releasing position, when the locking switch is in the locking position, the locking switch limits the trigger switch in a locked state, and the main control switch cannot be started; when the locking switch is in the releasing position, the locking switch is positioned beside the trigger switch and limits are removed, the trigger switch is in the release state, and the main control switch can be started.

A switch assembly, a switch assembly starting method and a power tool are provided. The switch assembly includes a housing, a main control switch accommodated in the housing, a locking switch and a trigger switch arranged on the housing. An end of the trigger switch is accommodated in the housing and is in contact with the main control switch. An end of the locking switch is in contact with the trigger switch. The locking switch has a locking position and a releasing position, when the locking switch is in the locking position, the locking switch limits the trigger switch in a locked state, and the main control switch cannot be started; when the locking switch is in the releasing position, the locking switch is positioned beside the trigger switch and limits are removed, the trigger switch is in the release state, and the main control switch can be started.

An electrical device, such as a flashlight includes an on-off switch that is movable between a maintained actuated position and a maintained unactuated position. The device has a body containing an electrical assembly that includes a power source, a switch, and an actuated member, such as a light. The switch includes a first conductor attachable to a first terminal of the power source. The switch member includes a switch portion that has a generally sheet-like portion that is disposed adjacent to the second terminal of the power source. The sheet-like portion includes a deformable central portion surrounded by a retained perimeter. The deformable portion is movable between a maintainable actuated position wherein it contacts the second terminal of the power source, and a maintained unactuated position wherein it is spatially separated from, and not in contact with, the second terminal of power source

An operating device (1) for a power tool, including at least one first and second switching element (40, 50), the first switching element (40) being settable to a first and a second mode, and the second switching element (50) being settable to a first and a second mode, the first switching element (40) including at least one first signaling means (21) for the particular signaling of the first or second mode, and the second switching element (50) including at least one second signaling means (22) for the particular signaling of the first or second mode. The operating device is designed in such a way that the second switching element (50) is settable from the first mode to the second mode only when the first switching element (40) is set from the first mode to the second mode.

An operating device (1) for a power tool, including at least one first and second switching element (40, 50), the first switching element (40) being settable to a first and a second mode, and the second switching element (50) being settable to a first and a second mode, the first switching element (40) including at least one first signaling means (21) for the particular signaling of the first or second mode, and the second switching element (50) including at least one second signaling means (22) for the particular signaling of the first or second mode. The operating device is designed in such a way that the second switching element (50) is settable from the first mode to the second mode only when the first switching element (40) is set from the first mode to the second mode.

A redundant and dissimilar system for monitoring the status of contactors of an aircraft control stick. This monitoring system comprises at least one electrical power source, at least one processor and several circuits for monitoring the status of the switches of the contactors. Each monitoring circuit comprises and electrical power source, a switch for each contactor, the switches of a contactor being connected to each other, and an electronic assembly provided with receivers arranged in series with each other. Each switch is arranged in parallel with at least one receiver so as to short-circuit the at least one receiver when the switch is in the closed state. Each processor measures and analyses an electrical feature of the electronic assembly, such as a mains voltage VE as the terminals of the electronics assembly, in order to determine the status of each switch.