Patent ID: 8631718

Claim:
A switch comprising: a shaft provided with a caulking process portion on an outer periphery thereof, the outer periphery of the shaft having a pair of opposing flat portions and an opposing pair of arcuate portions to form a racetrack configuration as viewed in plan view; and a movable board having a bore portion fitted on the shaft, wherein the caulking process portion is caulked to an edge portion of the bore portion with a predetermined caulking margin to form a caulking portion to the movable board and to couple the shaft to the movable board by caulking, wherein: the caulking portion is configured to sequentially provide at least one thin fillet portion, an axial thickness of which is relatively thin, and at least one thick fillet portion, an axial thickness of which is relatively thick, in a peripheral direction of the shaft, wherein the at least one thick fillet portion is formed as an integral construction with one of the pair of arcuate portions of the shaft and extends partially therealong in the peripheral direction, wherein the at least one thin fillet portion is formed as an integral construction with the same one of the pair of arcuate portions and the at least one thick fillet portion, and wherein the at least one thin fillet portion extends along the same one of the pair of arcuate portions from the at least one thick fillet portion in the peripheral direction to terminate at one of the pair of opposing flat portions.