Movable contact for switching

Abstract

The invention provides a movable contact for switching (1) which prevents a dome-shaped movable contact for switching from being deformed beyond necessity, and also prevents a contactor from being poorly recovered in advance. The movable contact for switching comprises a reversely recoverable contactor (2) formed by curving an electrically conductive leaf material into a dome-like shape while forming a rigid addition bulge (5) at the center of a convex surface (3) of the contactor, the bulge protruding toward a dome-shaped convex side, a plurality of contact points (6) formed by forming smallprojections concentrically positioned around the bulge (5), on a concave surface (6) of the contactor (2), the small projections protruding toward a dome-shaped concave side, and a recess (7) for usein prevention of deformation, on a convex side face of the bulge (5), formed by depressing a part of the circumference of the bulge (5), on a straight line connecting the center of the bulge (5) witheach of the contact points (6), toward the center.

Description

technical field [0001] The present invention relates to a switch incorporated in a signal input portion of various devices, and more particularly to an improvement of a dome-shaped movable contact with a knocking function for a switch. Background technique [0002] Patent Document 1 discloses such a dome-shaped movable contact. The movable contact forms a cylindrical protrusion at the center of a dome-shaped contact piece. For such a conventional movable contact, if a high load is applied to the central cylindrical protrusion, for example, a static load of 10 kg for 1 minute, a static load of 20 kg for 5 seconds, or a static load of 40 kg for 1 second, the cylindrical protrusion will be flattened. , The entire dome-shaped movable contact is deformed in the direction of diameter expansion in such a way that it protrudes outward, and there is a phenomenon that it cannot return to its original shape, that is, poor recovery. [0003] In particular, when the periphery of the cy...

AI Technical Summary

Problems solved by technology

For such a conventional movable contact, if a high load is applied to the central cylindrical protrusion, for example, a static load of 10 kg for 1 minute, a static load of 20 kg for 5 seconds, or a static load of 40 kg for 1 second, the cylindrical protrusion will be flattened. , The dome-shaped movable contact is deformed in the direction of diameter expansion in a manner that protrudes outward as a whole, and the phenomenon that it cannot return to the original shape occurs, that is, poor recovery

[0003] In particular, when the periphery of the cylindrical protrusion is formed by a curved surface with a small gradient and a small protruding contact that contacts the fixed contact is formed on the periphery of the cylindrical protrusion, the movable contact deforms in the direction of diameter expansion under a high load. When using a small protruding contact point as a fulcrum, a large deformation occurs beyond the reverse recovery limit, so it is easy to cause multiple recovery failures

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