Electrical switch with shear force contact weld release
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United States of America Patent
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Oct 7, 2014
Grant Date -
Jan 17, 2013
app pub date -
May 2, 2012
filing date -
Jul 12, 2011
priority date (Note) -
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Abstract
An electrical switch provides a center contact moving between two outer contacts, at least one of which is mounted on a lever. In the event of a contact weld forming between the center contact and the lever mounted contact, unison motion of the lever mounted contact following the center contact during switching causes a strong shear force tending to break the weld. In one embodiment, a fulcrum wall striking the lever of the lever mounted contact causes increased angulation between the contacts so that unison motion rotates and peels the contacts apart.
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