Patent ID: 8354905

Claim:
A noise decreasing type electromagnetic switch comprising: a stationary core; a movable core alternatively contactable with and separable from the stationary core; a return spring disposed between the movable core and the stationary core to apply an elastic force such that the movable core is separated from the stationary core; a shaft connected to the movable core and movable together with the movable core; a movable contact point coupled to the shaft and movable together with the shaft; a stationary contact point fixed to face the movable contact point and contactable with and separable from the movable contact point such that an electric circuit is closed or open; a contact spring configured to elastically support the movable contact point to contact the stationary contact point; and a buffer disposed between an end of the stationary core and an end of the movable core and facing the end of the stationary core to elastically support the movable core with respect to the stationary core, wherein the buffer is formed as a bellows, a first end of the bellows coupled to the end of the stationary core and a second end of the bellows coupled to the end of the movable core, wherein the bellows comprises consecutive folded or bent portions surrounding an inner space between the first and second ends of the bellows, wherein stepped concave portions are formed at an outer circumferential surface of the end of the stationary core and the corresponding outer circumferential surface of the end of the movable core, and wherein the bellows is fixedly inserted between the outer circumferential surfaces of the stationary core and movable core such that the concave portions of the stationary core and movable core protrude partially into the inner space of the bellows.