Patent ID: 8460010
Filing Date: 2013-06-11
Classification: G01R,H01R

Abstract:
1. A contact comprising: a plate-shaped first plunger contacting one member; a plate-shaped second plunger contacting the other member with a large area in a state of being overlapped with the first plunger at the plates and conducting electricity between the one member and the other member in cooperation with the first plunger; and a compression coil spring which is a member coupling the first plunger with the second plunger in a state where contact pieces thereof are in opposite directions from each other, covering outer circumferences of coupling portions of the first plunger and the second plunger, abutting on spring receiving portions of the respective plungers, and supporting the respective plungers to be relatively slidable; wherein, as for the compression coil spring, an intermediate portion thereof is a compression coil spring having a large diameter, and both end portions thereof are constituted by adhesion small-diameter portions which are adhesion coil springs having small diameters, and wherein an inside diameter of each of the adhesion small-diameter portions at both end portions is set to be equal to or smaller than a diameter of a circumscribed circle circumscribing a cross-sectional shape of the respective coupling portions of the first plunger and the second plunger in a state of being overlapped; wherein one of the first plunger and the second plunger, and two of the other are provided, the coupling portion of the one plunger is configured to be sandwiched between the coupling portions of the other two plungers, and a width dimension of the coupling portion of the one plunger is larger than width dimensions of the coupling portions of the other two plungers.