Contact device, and electromagnetic switch in which the contact device is used
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United States of America Patent
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May 16, 2017
Grant Date -
Feb 5, 2015
app pub date -
Oct 3, 2014
filing date -
Apr 13, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A contact device includes a pair of fixed contacts fixedly disposed inside an arc extinguishing chamber and maintaining a predetermined interval from each other; a movable contact disposed inside the arc extinguishing chamber, and contacting to and separating from the pair of fixed contacts; a first arc root movement promotion portion formed on the pair of fixed contacts, and promoting a movement of a root of an arc in a direction away from the movable contact, the arc being generated when contacts are opened in which the movable contact moves away from the pair of fixed contacts; and a second arc root movement promotion portion formed on the movable contact, and promoting a movement of the root of the arc in a direction away from the relevant fixed contact.
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