A fastener, in particular of a chassis component, has at least one sensor and at least one transmitter of a monitoring device for monitoring at least one mechanical fastening parameter. At least one power supply unit is associated with the transmitter, that the transmitter and the power supply unit are connected to one another by means of a switching contact, that an electrical connection can be closed by means of the switching contact, that the switching contact is designed in such a way that the electrical connection is open when the fastener is installed properly and is closed only when the fastener is released, and that the transmitter is supplied with current and transmits a signal only when the electrical connection of the switching contact is closed.

The utility model discloses an automatic balance apparatus with a double-moving-contact spring leaf in a socket, which may ensure that two moving contacts are in good contact with corresponding stationary contacts. The automatic balance apparatus includes a lifting slide block, where the lifting slide block is provided with a lifting base below the spring leaf, a balance warped plate corresponding to an arrangement direction of moving contacts is movably disposed in the lifting base, and upward protruding portions are respectively disposed on two sides of the top surface of the balance warped plate. The utility model is particularly applicable to various ground fault circuit interrupters (GFCIs) and arc fault circuit interrupters (AFCIs).

An electromagnetic relay 1 includes: a base 28; a pair of fixed contact terminals 22 each including a fixed contact 38 and a first fulcrum 22d fixed to the base; a movable contact spring 18 including a pair of movable pieces, each of the movable pieces including a movable contact 36 contacting and separating from the fixed contact; an armature 16 that is coupled with the movable contact spring, and moves the movable contact spring by a rotary motion around a second fulcrum 16e; an electromagnetic device 31 that drives the armature; and a permanent magnet 12 that is arranged between the pair of fixed contact terminals and between the pair of movable pieces, and generates a magnetic field; wherein the first fulcrum and the second fulcrum are arranged mutually in opposite directions with respect to the movable contact or the fixed contact.

A contact device according to an embodiment includes: a fixed contact assembly including a first fixed contact and a second fixed contact; and a moving contact assembly including a first moving contact and a second moving contact. The moving contact assembly includes: a first moving member; and a second moving member. The second moving member is arranged, in a first direction, between the first moving member and the fixed contact assembly and fixed to the first moving member at one end in a second direction intersecting with the first direction. The first moving contact and the second moving contact move as the first moving member moves. A first distance from the one end in the second direction to the first moving contact is longer than a second distance from the one end in the second direction to the second moving contact.

The electromagnetic relay includes a contact unit, an electromagnet, an armature unit, and a base. The contact unit includes a fixed contact and a movable spring including a movable contact. The armature unit is movable in accordance with excitation of the electromagnet to allow the movable contact to move between a closed position in contact with the fixed contact and an open position away from the fixed contact. The base holds the contact unit and the electromagnet on a certain surface side. The movable contact is placed between the base and the fixed contact in an arrangement direction in which the base and the electromagnet are arranged. The armature unit includes a press part which causes movement of the movable contact by applying a pressing force to a certain surface facing the fixed contact, of the movable spring.

An electric switch of the normally open type includes a body, an actuator moveable between a high rest position and a low active contact position, and first second elastically deformable contact blades supported by the body. A first contact section of the first contact blade extends above a second contact section of the second contact blade. The contact sections are superposed and distanced from each other when the actuator is in high rest position, and they are in mutual electrical contact when the actuator is in low position to establish an electrical switching path. The first contact section includes a longitudinal rib that protrude downwards with respect to the plane of the underside of the first section and which is able to cooperate with the transversal contact edge of the central opening. The transversal contact edge comprises a transverse contact bend for cooperating with convexity of the longitudinal rib.

The present invention relates to a start switch or contact point (10) for rotating electric machines with single-phase power supply, having a base (100) bearing actuating arms (200) carrying conductive blades (300). The actuating arms (200) are independent and one-piece, each one carrying at least one conductive blade (300) and being pressed against a stop (220) by a resilient element (400), also including a sliding surface (230) with a friction-reduction region (235). The present invention also relates to an electric machine provided with a corresponding start switch or contact point.

The present invention relates to a start switch or contact point (10) for rotating electric machines with single-phase power supply, having a base (100) bearing actuating arms (200) carrying conductive blades (300). The actuating arms (200) are independent and one-piece, each one carrying at least one conductive blade (300) and being pressed against a stop (220) by a resilient element (400), also including a sliding surface (230) with a friction-reduction region (235). The present invention also relates to an electric machine provided with a corresponding start switch or contact point.

A key switch implements a receiving switch conductor and transmitting switch conductor in the key switch. Depressing the key switch will cause the receiving switch conductor and transmitting switch conductor to approach each other. The approach of a finger and movement of the key switch can be detected using the receiving switch conductor and the transmitting switch conductor.

According to various embodiments, there is provided a key switch mechanism including: a key button; a plunger attached to the key button and displaceable between a neutral position and an activation position; an elastomeric dome which, when the plunger is in the neutral position, is non-deformed and which, when the plunger is in the activation position, is elastically deformed by the plunger; a conductive spring having a stationary end portion and a moveable end portion, the stationary end portion electrically coupled to a circuit, and the moveable end portion coupled to the elastomeric dome in a manner to be moved when the plunger is displaced towards the activation position, in connection with the corresponding deformation of the elastomeric dome; and an electrical contact electrically coupled to the circuit, wherein, when the plunger is in the neutral position, the electrical contact is arranged at a distance from the moveable end portion, and, when the plunger is in the activation position, the moveable end portion is moved to contact the electrical contact.