Patent ID: 6271491
Filing Date: 2001-08-07
Classification: H01H

Abstract:
A push button switch, comprising:fixed contacts;a dome-shaped movable contact disposed above said fixed contacts and having a dome-shaped apex portion;a projection formed on an inner surface of said movable contact at a portion excluding said dome-shaped apex portion so as to be in contact with and separated from one of said fixed contacts;a housing;said fixed contacts disposed on an inner bottom of said housing;said movable contact formed of a metal material having a spring property;a stem movably disposed to said housing;a plurality of projections disposed on said dome-shaped inner surface in a scattered state at positions where they can come into contact with the portion around the center of the fixed contact excluding the center;said plurality of projections independently formed in said scattered state;said dome-shaped apex portion of said movable contact disposed inwardly of said projections acts as a movable region when said movable contact is reversed;a press section disposed at the lower end of said stem and abutted against said dome-shaped apex portion of said movable contact; andsaid stem being urged in a direction to project externally of said housing by the pressure of a dome-shaped spring through said press section.