The contact device includes: a fixed contact member including a fixed contact; and a movable contact member including a movable contact. The movable contact member is movable between a position where the movable contact is in contact with the fixed contact and a position where the movable contact is away from the fixed contact. The movable contact member further includes a protrusion which protrudes from a face to which the movable contact is provided, in a direction same as a protruding direction of the movable contact.

A membrane switch is provided having at least two surfaces having contact members (15, 16 or 24) thereon. Such contact members can be applied to different layers (14 and 22) of the switch assembly or to both the top and bottom surfaces of the same layer (14) of the switch assembly. Certain of the contact members of the different surfaces are in registration with each other and are of such a configuration to permit the combined contact of such members with a base layer (34).

A membrane switch is provided having at least two surfaces having contact members (15, 16 or 24) thereon. Such contact members can be applied to different layers (14 and 22) of the switch assembly or to both the top and bottom surfaces of the same layer (14) of the switch assembly. Certain of the contact members of the different surfaces are in registration with each other and are of such a configuration to permit the combined contact of such members with a base layer (34).

An improved, low cost, high speed keyboard encoding device is provided which develops directly encoded, valid and reliable multi-bit output signals and overcomes problems associated with tolerance errors and adverse environmental and usage conditions (e.g., manufacturing errors, dust, wear). The preferred encoding device includes a plurality of juxtaposed, flexible conductive strands or wires each having a number of axially spaced impact zones along the length thereof which are either insulated or electrically conductive; corresponding zones on the separate wires are operably aligned to cooperatively define a series of spaced impact zone sets each made up of a unique pattern of conductive and insulated zones. An electrically conductive, rubber-like resilient pad having a series of ridge-like elongated members respectively aligned with corre- _spon_ding impact zone sets is also provided which is designed for impact-shifting of the members into momentary contact with the associated zone sets, whereby electrical contact is made between the ridge members and the conductive impact zones of the set. The resulting circuit making and current flow directly generates a momentary, unique, digitalized output signal without the need for conventional encoding electronic circuitry. The device is particularly suited for use in an impact-type keyboard where, upon depression of each key, an associated resilient element is shifted, released, and allowed to overtravel its rest position and momentarily strike the encoding device at a location for shifting the appropriate pad ridge into contact with the adjacent impact zone set.

Disclosed herein is a movable contact assembly for a circuit breaker, and more particularly, a movable contact assembly for a circuit breaker in which a pressurizing protrusion for pushing a catch is provided at each of movable contact fingers and thus, when current limiting interruption occurs in any one of the movable contact fingers, reinputting of the movable contact fingers is prevented such that blocking thereof is stably kept. According to an aspect of the present invention, there is provided a movable contact assembly for a circuit breaker, which includes a fixed contact, a connector formed to protrude from one side of a terminal connected to a load or a power source, a plurality of movable contacts pivotably installed at the connector through a connector pin and configured to be contactable to or separable from the fixed contact, a side holder pivotably installed at the connector through the connector pin, a catch pivotably installed at the connector, supported on the side holder, and configured to restrict a rebound phenomenon of the plurality of movable contacts when current limiting interruption occurs, and a pressurizing protrusion formed at a lower portion of each of the plurality of movable contacts and configured to push the catch when the current limiting interruption occurs.

A switch comprising: a cover (80); a base (20); and a push button (70) comprising: an elastic touch piece (73) formed in a sidewall of a sliding part of the push button (70), wherein the push button (70) is vertically and slidably installed in a space formed by assembling the cover (80) to the base (20), wherein a free end of the elastic touch piece (73) is configured to abut the base (20) when the push button (70) is pushed, and the free end is configured to abut the cover (80) when the pushed push button (70) is returned.

An improved, low cost, high speed keyboard encoding device is provided which develops directly encoded, valid and reliable multi-bit output signals and overcomes problems associated with tolerance errors and adverse environmental and usage conditions (e.g., manufacturing errors, dust, wear). The preferred encoding device includes a plurality of juxtaposed, flexible conductive strands or wires each having a number of axially spaced impact zones along the length thereof which are either insulated or electrically conductive; corresponding zones on the separate wires are operably aligned to cooperatively define a series of spaced impact zone sets each made up of a unique pattern of conductive and insulated zones. An electrically conductive, rubber-like resilient pad having a series of ridge-like elongated members respectively aligned with corre- _spon_ding impact zone sets is also provided which is designed for impact-shifting of the members into momentary contact with the associated zone sets, whereby electrical contact is made between the ridge members and the conductive impact zones of the set. The resulting circuit making and current flow directly generates a momentary, unique, digitalized output signal without the need for conventional encoding electronic circuitry. The device is particularly suited for use in an impact-type keyboard where, upon depression of each key, an associated resilient element is shifted, released, and allowed to overtravel its rest position and momentarily strike the encoding device at a location for shifting the appropriate pad ridge into contact with the adjacent impact zone set.

A contact of a vacuum interrupter comprises a contact body portion formed in the shape of a circular plate, having a contact surface in a flat shape on one surface thereof, and provided with a plurality of cut portions formed in a spiral shape from a center of the contact surface toward an outer side in a radial direction, and an inclination area formed between the contact surface and an outer circumferential surface of the contact body portion. The contact of the vacuum interrupter is characterized in that the inclination area is provided with multi-stage inclined portions each forming a multi-stage inclination along the outer side of the contact body portion in the radial direction.

[Problem] Provided is a contact structure for a switch, in which a contact region is increased, a conduction failure can be more precluded, and the operational reliability of the switch can be improved by allowing contact points between contacts to be line contacts.

[Means for Solution] The contact structure for a switch includes a pair of contacts that are opposed to each other to open or close the switch by allowing the contacts to come into contact with or to separate from each other, wherein a contact surface of a first contact is formed into a concave shape provided with a projection and a recess; a contact surface of a second contact is formed into a rounded surface; and the projection of the first contact and the rounded surface of the second contact are configured to come into contact with each other.

The invention proposes an electrical switch which comprises a top metal support plate (14), a triggering member (16) bearing on a bottom (38) of a recess (40), a bottom metal contact plate (10) that has a fixed central contact region (62), and an adhesive fixing insulating sheet (12), which is arranged between a peripheral portion of the bottom face (26) of the top support plate (14) and a peripheral portion of the top face (60) of the bottom contact plate (10) and which adheres by its two opposite faces (68, 70) to each of said two annular portions to form a means for fixing the top support plate (14) to the bottom contact plate (10).