A key structure includes a key, a key sheet and a supporting portion. The key displaces in a direction. The key sheet is disposed at a side of the key toward which the key displaces and comprises a sheet base portion and a contacting portion that displaces in the displacing direction of the key in accordance with a displacement of the key. The supporting portion is disposed between the key and the sheet base portion and supports one end portion of the key by contacting a member disposed opposite to the supporting portion while the other end portion of the key displaces in the displacing direction of the key.

An accessory device for a circuit breaker. The device includes a housing having a top wall and a hinge portion. The device also includes a plunger arm that extends from the hinge portion to form a cantilever wherein the plunger arm includes a first surface and a sloped surface. The plunger arm is moveable between an initial position wherein the plunger arm does not activate the first and second switches located in the housing and a deflected position wherein the first and sloped surfaces simultaneously contact the first and second switches, respectively, thereby activating the first and second switches. The plunger arm also includes a plunger portion that is oriented transverse to the plunger arm. A mating surface is formed on the plunger portion that mates with a mating surface of a circuit breaker operating mechanism. Further, the housing, hinge portion, plunger arm, and plunger portion are integrally formed.

A seamless button including a guiding element, a movable actuating element and a switch located on a mounting plate. The movable actuating element is made of elastic material with a massive middle shaft spaced from the inner walls of the chamber by an air gap. It has an upper actuating surface and crimp surrounding the actuating surface above the air gap. It also has a profile area at the outer circumference of the movement crimp, where the horizontally outwardly extending portion of the profile area rests on top of the outer wall, the downwardly extending portion of the profile area rests on the outside of the outer profile edge and the protrusion rests on the pedestal covering it at least partially. A seamless multi-button is also disclosed, with a method for manufacturing seamless buttons.

An electronic device is disclosed. The electronic apparatus has a board plate provided in a position apart from the operating direction of push buttons for receiving depressing operations. Detection switches for detecting the depressing operations of the push buttons are provided on the lower surface side of the board plate, and the push buttons are provided adjacent to the side part of the board plate and includes a vertically-movable operation surface part for receiving depressing operations and a detection arm, which protrudes from one edge part of the operation surface part to the lower surface side of the board plate and presses the detection switches by moving in the opposite direction to the direction of the vertical movement of the operation surface part.

A control device, includes a switch (2) with a rotary control rod (20) having a diametrical slot (21) which extends in a plane of reference (P), a molded plastic knob (3) which includes a housing receiving the control rod, the housing including two flexible fingers (31, 32) which are diametrically opposed and provided so as to be resilient radially inward, and two fixed fingers (33, 34) which are diametrically opposed and are connected together via a connecting wall (35) which extends along the plane (P), the connecting wall (35) being received in the diametric slot without any play in order to immobilize the knob in relation to the control rod in a direction (Y) perpendicular to the plane (P), the two flexible fingers holding the knob along the axis (A) by friction or by mechanical or spring-assisted blocking.