Importance

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Abstract

The switching unit of a snap action electric switch employs a contact of the type called mainplate and having a circumferentially complete frame with a substantially diametrically extending blade. The frame has two lugs which flank the median portion of the blade and can be affixed to or simply abut the bottom wall of a cupped mounting member which further receives a pusher capable of moving the median portion of the mainplate from a first end position, at a distance from the bottom wall of the mounting member, toward and through a dead-center position whereupon the median portion snaps to a second end position in which it engages a contact at the bottom wall of the mounting member. The end portions of the blade merge tangentially into the adjacent concavoconvex sections of the frame. The useful life of the mainplate is longer than that of a conventional mainplate wherein four corner portions of the frame are affixed to the bottom wall of the mounting member. In addition, the touch of median portion of the blade is more satisfactory, all because only two portions of the frame, namely the two lugs which flank the median portion of the blade, are in abutment with or are actually affixed to the bottom wall of the mounting member.

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First Claim