Abstract: A push button assembly including an operating unit and a switch unit having an enclosure. The operating unit is comprised of a housing, fastened to the switch unit enclosure, and having a hollow interior section. The operating unit is further comprised of a collar member having one end positioned within the interior section of the housing and another end extending outward therefrom, and a mushroom head fixed to the other end of the collar member. Also provided is an actuating plunger having one end mechanically coupled to the one end of the collar member and having another end coupled to the switch unit. Further provided are means for maintaining the collar member in a first position and means for maintaining the collar member in a second position.