A switch includes a switch housing having a receiving space, a conductive fixed contact element and a conductive active contact element which are provided in the receiving space and being electrically connected to two terminals of the switch respectively, an actuating member reciprocating movable in a predetermined actuating direction between a rest position and an actuated position, and a conductive spring contact element movable with the actuating element. The spring contact element is in constant contact with the fixed contact element and switched between a state of being in contact with a conductive contact surface of the active contact element and a state of being disconnecting with the conductive contact surface of the active contact element. The actuating element is moved back from the actuated position to the rest position due to spring force of the spring contact element.

Provided is an electric switch, including a casing, an actuator, a movable contact frame, a snap-action resilient member, a lock mechanism, a signal switch and a contact switch. The actuator is capable of reciprocating along a first direction. The movable contact frame is provided with a retaining portion. The snap-action resilient member is arranged in the movable contact frame and is compressed by the actuator when the actuator moves. The lock mechanism includes two lock members which are capable of reciprocating in the mounting cavity along a second direction with the movement of the actuator, so as to lock or unlock the retaining portion. A brush of the electric switch is arranged on the movable contact frame. A movable contact of the contact switch is arranged on the movable contact frame.

A key structure includes a supporting plate, a movable plate, a keycap and a limiting structure. The supporting plate has supporting plate opening. The movable plate has a movable plate opening. The supporting plate is disposed over the movable plate. The keycap is disposed over the supporting plate. The limiting structure is disposed on the keycap and inserted in the supporting plate opening. When the movable plate is moved to a disabled position, the limiting structure is not aligned with the movable plate opening and the limiting structure in the supporting plate opening is stopped by the movable plate. Consequently, the keycap is not allowed to be moved.

A system and method for enabling a person with very limited motor and verbal skills to communicate with another person. The system has a pair of spring-loaded buttons having a switch and a contact surface that is pushed by the person to send a contact signal to a controller unit to convert the contact signal into an indication signal. The indication signal is sent to an display to display a message in response to the selected movement of the person's head.

A system and method for enabling a person with very limited motor and verbal skills to communicate with another person. The system has a pair of spring-loaded buttons having a switch and a contact surface that is pushed by the person to send a contact signal to a controller unit to convert the contact signal into an indication signal. The indication signal is sent to an display to display a message in response to the selected movement of the person's head.

An apparatus for auxiliary contact of a circuit breaker includes a frame, a fixed contactor fixed to the frame inside the frame, a movable contactor installed inside the frame to be contacted with or separated from the fixed contactor, and a contact control member installed inside the frame, the contact control member being formed in a straight line shape, the contact control member being pressurized upward as an overcurrent is applied to the circuit breaker to allow the movable contactor to be contacted with or separated from the fixed contactor.

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 push switch contains a case including a housing space having an upper-opening and including fixed-contacts disposed on a bottom of the housing space, a movable contact member disposed in the housing space configured to deform in response to receiving pressure applied from above, and contacting the fixed-contacts upon defoming in response to the received pressure, and a pushing member disposed on the movable contact member and configured to transmit the received pressure to the movable contact member. The movable contact member includes a pair of first-linear edges, wherein the pushing member includes a plurality of projecting-pressing portions disposed on a bottom surface of the pushing member facing the movable contact member, and wherein the plurality of pressing portions is disposed on the bottom surface at positions not overlapping a straight-line that passes through a center of the movable contact member and intersecting each of the pair of first-linear edges.

A control device includes an upper actuator panel, a lower support frame relative to which the upper panel is mounted to be mobile vertically, an electric switch the body of which is carried by the upper panel, and a set of two arms for actuating the electric switch. Each arm of the set includes a distal section that bears against a portion of the upper panel, a proximal section that bears on the actuator of the electric switch, and an intermediate section that bears against a portion of the lower frame and about which each actuator arm is mounted to pivot. The actuator arms cooperate with the upper panel and the lower frame to maintain the upper panel horizontal during its movement relative to the lower support frame.

A keyboard device includes a membrane circuit board and a key structure over the membrane circuit board. The key structure includes a keycap, a plunger structure, a key pedestal and an elastic element. The plunger structure is arranged between the keycap and the elastic element. At least a portion of the keycap is disposed within a pedestal dust-storage chamber of the key pedestal. At least a portion of the plunger structure is disposed within a guiding chamber of the key pedestal. Due to the relative location between the keycap, the plunger structure and the key pedestal, the path of the dust to enter the guiding chamber is extended or blocked. Consequently, the dust-proof efficacy is enhanced.