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Electromagnetic switching device

  • US 9,076,620 B2
  • Filed: 11/12/2013
  • Issued: 07/07/2015
  • Est. Priority Date: 02/18/2013
  • Status: Active Grant
First Claim
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1. An electromagnetic switching device comprising:

  • a shaft coupled with a movable contact point such that the shaft moves up and down, the shaft comprising a large diameter portion and a small diameter portion below the large diameter portion;

    an elastic member coupled with a bottom end of the shaft and having an asymmetric bottom surface;

    a fixed core surrounding an outer side of the shaft, the fixed core comprising an upper fixed core that surrounds an outer side of the large diameter portion of the shaft and a lower fixed core vertically spaced apart from the upper fixed core; and

    a movable core at an outer side of the small diameter portion of and coupled with the outer side of the shaft,wherein a vertical volume of the elastic member expands as temperature is increased.

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