The emergency stop switch unit 2 as an operation switch unit includes a direct operation part 20A and an alternative operation part 20B. The direct operation part 20A has an emergency stop button 21 adapted to be directly operated. The alternative operation part 20B is adapted to be linked with the direct operation part 20A and alternatively operates the emergency stop button 21 in place of the direct operation part 20A. The alternative operation part 20B has a reception part 32 that detects a remote operation of the emergency stop button 21 and an electromagnetic solenoid 3 that actuates the emergency stop button 21 on the basis of the remote operation detected by the reception part 32.

A keyboard including a substrate and a key structure is provided. The key structure is disposed on the substrate and includes a keycap, an antenna, and a sensor. The keycap is disposed on the substrate, and a length of the keycap is greater than a width of the keycap. The antenna is disposed on a back surface of the keycap facing toward the substrate. The sensor is disposed below the keycap and is electrically connected with the antenna.

A switch device structure includes an assembly of a main body and an operation body. An electrical connection module and an elastic unit are mounted on the main body. The contact arm of the electrical connection module has a first member and/or a second member with variable arrangement position. According to the position or motion of the operation body, the elastic unit provides an elastic force to push the contact arm of the electrical connection module into a contacting circuit closed state or make the elastic unit separate from the contact arm to form a circuit open state. The arrangement form of the first member and/or the second member of the contact arm of the electrical connection module is variable in accordance with the specification of the switch to achieve NO mode and NC mode.

A safety button cover for use with a button station is provided. The safety button cover comprises a button cover sleeve with a first and second open end that define an interior space therebetween. A dividing wall is provided between the first and second open ends to separate the interior space into a first recess and second recess. The dividing wall further includes at least one opening to permit a corresponding button of the button station to extend from the first recess through the opening into the second recess. When the safety button cover is installed over the button station, a portion of the button cover sleeve surrounds a button panel and a portion of a button housing on which the button is installed to define an overlap region between the safety button cover and the button station.

A safety button cover for use with a button station is provided. The safety button cover comprises a button cover sleeve with a first and second open end that define an interior space therebetween. A dividing wall is provided between the first and second open ends to separate the interior space into a first recess and second recess. The dividing wall further includes at least one opening to permit a corresponding button of the button station to extend from the first recess through the opening into the second recess. When the safety button cover is installed over the button station, a portion of the button cover sleeve surrounds a button panel and a portion of a button housing on which the button is installed to define an overlap region between the safety button cover and the button station.

A keyboard device includes a substrate, a keycap, and a link member. The keycap is disposed on the substrate and provided with a limiting member including a top wall, a bottom wall, and a slide groove. In the slide groove, the top wall has a first guide bevel and the bottom wall has a second guide bevel. The link member is disposed between the substrate and the keycap and includes a slide connection portion and a pivot connection portion. The slide connection portion is slidably disposed in the slide groove, and the pivot connection portion is pivotally connected to the substrate. When the keycap is pressed to move downwardly toward the substrate, the pivot connection portion of the link member is rotated with respect to the substrate, and the slide connection portion slides along the first guide bevel and the second guide bevel.

A push switch and a motor vehicle in which such a push switch is used. The push switch has a push cap, a baseplate, a switch element which is actuatable by the push cap, a first lever, and a second lever. The first lever and the second lever are mounted rotatably on the baseplate by means of bearing blocks and are each connected movably to the push cap at a first lever end. At a second lever end, the first lever and the second lever are connected movably to one another. The first lever and the second lever are designed such that they form mass compensation for the push cap.

A backlit keyboard includes key switches and a backlight module. The backlight module includes a light guide plate, a reflecting surface, and at least one light-emitting device. The light guide plate is provided with light-guiding dots disposed on a bottom surface thereof. A light-shielding layer disposed on the light guide plate has a light-shielding portion and a light-transmitting portion corresponding to at least one of the key switches. The reflecting surface faces the bottom surface of the light guide plate, and a pattern at least partially overlaps the light-shielding portion. A first light-emitting device and a second light-emitting device are disposed in an opening of the light guide plate, and the first light-emitting device and the second light-emitting device face respective sidewalls of the opening. The first light-emitting device is located underneath the light-shielding portion.

A magnetic type keyswitch includes an actuating member and a switch unit. The actuating member is movable in response to a pressing force. The switch unit includes a circuit board, a Hall sensor electrically connected to the circuit board, and a magnet spaced apart from the Hall sensor by a fixed distance. When the pressing force is not applied, the magnet enables the Hall sensor to output a first voltage, and when the pressing force is applied, the actuating member moves relative to the magnet and the Hall sensor in response to the pressing force, so that the Hall sensor outputs a second voltage different from the first voltage, and the magnetic type keyswitch generates a triggering signal.

A key structure includes a supporting frame, a keycap, a stabilizer bar and two flexible hooks. The supporting frame includes at least one supporting hook. The keycap is located over the supporting frame. The keycap includes two connecting parts. The stabilizer bar includes a transverse bar part and two branch bar parts. The transverse bar part is locked in the at least one supporting hook of the supporting frame. The two flexible hooks are arranged between the keycap and the stabilizer bar. Each of the two flexible hooks includes a coupling terminal and a hook part. Each of the two connecting parts of the keycap is detachably connected with the coupling terminal of the corresponding flexible hook. Each of the two branch bar parts of the stabilizer bar is locked in the hook part of the corresponding flexible hook.