An electrical switch unit for use in controlling operation of an electrical device, the electrical switch unit including: an electrical switch unit housing for housing at least a pair of electrical switching contacts of the electrical switch unit, said electrical switch unit housing including a first housing member and a second housing member that are configured for attachment together at peripheral regions of the first and second housing members so as to cooperatively form an enclosed space for housing the pair of electrical switching contacts therein; an actuator member operably-connected with at least one of the pair of electrical switching contacts, the actuator being configured for movement relative inwardly and outwardly of an opening in the electrical switch unit housing so as to arrange the pair of electrical switching contacts into at least one of a closed configuration wherein power is able to be supplied from a power source to motor or other electrically-operable element of the electrical device via the pair of electrical switching contacts, and, an opened configuration wherein power is not able to be supplied from the power source to the motor or other electrically-operable element of the electrical device via the pair of electrical switching contacts; and an sealing element including an elastically-resilient polymeric material, said sealing element being configured for location between the first and second housing members and extending about the peripheral regions of the attached first and second housing members so as to occlude passage and ingress of particulates and water into the electrical switch unit housing.

An adapter assembly configured to be coupled to a surgical loading unit includes a switch, an elongated member, and an annular member. The switch is configured to be toggled in response to the surgical loading unit being coupled to the adapter assembly. The elongated member is in communication with the switch and is resiliently biased in a distal direction toward a locking position in which the switch is toggled. The annular member is disposed adjacent the elongated member and is rotatable between a first orientation, in which the annular member prevents distal movement of the elongated member, and a second orientation, in which the elongated member moves distally to toggle the switch.

A hand-held power tool, in particular an angle grinder, includes a tool receiver, a tool housing, and a drive motor arranged in the tool housing. The drive motor is configured to be switched on and off via an electric On/Off switch for driving the tool receiver. The hand-held power tool also includes an actuating device configured to actuate the On/Off switch. The actuating device has a pivotably mounted actuating element and a pivotably mounted pawl that is configured to be coupled to the actuating element. The pawl is further configured, in a free-running state, to move pivotably relative to the actuating element and, in an actuation state, to exert upon the actuating element an actuating force that actuates the actuating device.

The present disclosure introduces apparatus and related methods pertaining to a first electrical power cable, a second electrical power cable, and a set of breakers. The first and second electrical power cables each extend a variable distance between a static system at a wellsite and a movable system at the wellsite. The breakers are operable to select either of the first and second electrical power cables to couple electrical power from a stationary electrical power source at the static system to a load at the movable system.

A machine tool, in particular an angle grinder, includes at least one switching unit that has at least one movably mounted ratchet element and at least one release element for unlocking a movement preventer of the ratchet element. The release element has at least one actuating region that is at least partially arranged laterally alongside an operating area of the ratchet element.

An adapter assembly configured to be coupled to a surgical loading unit includes a switch, an elongated member, and an annular member. The switch is configured to be toggled in response to the surgical loading unit being coupled to the adapter assembly. The elongated member is in communication with the switch and is resiliently biased in a distal direction toward a locking position in which the switch is toggled. The annular member is disposed adjacent the elongated member and is rotatable between a first orientation, in which the annular member prevents distal movement of the elongated member, and a second orientation, in which the elongated member moves distally to toggle the switch.

An electronic module is provided including a circuit board a first conductive track, second conductive tracks, third conductive tracks mounted on a first surface of the circuit board; at least one first heat sink mounted on the first conductive track; second heat sinks mounted respectively on the second conductive tracks; motor terminals formed through the third conductive tracks; and power switches mounted on the second surface of the circuit board configured as an inverter circuit to supply power from a power supply to an electric motor. High-side power switches are located opposite the at least one first heat sink and in thermal communication therewith, and low-side power switches are located opposite the second heat sinks and in respective thermal communication therewith.

A lock member includes a fit portion, an inclined portion and a contacting portion. The fit portion is fitted with a projecting portion of a trigger to maintain an off-lock state. The inclined portion is brought into contact with a shaft of an unlock button and moves the lock member to release the off-lock state. The projecting portion is slidable on the contacting portion and maintains an on state.

It is enabled to facilitate fine adjustment of power as well as reduction of the amount of movement required to maximize the power. An actuator 13 is moved by operation of a user. A pressure sensitive sensor 15 detects applied pressing force. A pressing member 14 presses the pressure sensitive sensor 15. When the amount of movement of the actuator 13 is smaller than a predetermined amount, the pressing member 14 presses the pressure sensitive sensor 15 to apply force corresponding to the amount of movement of the actuator 13. When the amount of movement of the actuator 13 is not smaller than the predetermined amount, the pressing member 14 presses the pressure sensitive sensor 15 to apply force corresponding to pressing force applied to the actuator 13 by the user.

A trigger switch TS includes a trigger that moves in a pulling direction in response to pressure of a pulling operation and moves in an opposite direction to the pulling direction in response to being released from the pressure. The trigger switch TS includes a lock guide 6 (movable engagement member) that moves in conjunction with movement of the trigger, and a ratchet ring 7 (restraint engagement member) that engages with the lock guide 6 to prevent movement of the lock guide 6 in the opposite direction to the pulling direction. The ratchet ring 7 allows the lock guide 6 to move in the pulling direction, and engages with the lock guide 6 to prevent movement in the opposite direction from a position to which the lock guide 6 is moved in the pulling direction.