Patent ID: 7897887

Claim:
A ball switch in a multi ball-switch arrangement, the ball switch comprising: a base plate; a metallic circular disk centrally disposed on the base plate; a first electrically-conductive contact track co-planar with the circular disk and extending therefrom to a first edge of the base plate; a dielectric sealing ring concentrically surrounding the circular disk; a chamber plate having a through-bore, the chamber plate being disposed opposite the base plate so as to form a chamber which concentrically circumscribes the circular disk, the chamber having a metallic inner wall with a circumferential first metallic annular strip disposed at a first end thereof at a first side of the chamber plate and a second metallic annular strip disposed at a second end thereof at a second side of the chamber plate, the sealing ring being disposed between the first metallic annular strip and the base plate so as to seal the chamber; an adhesive layer disposed between the chamber plate and the base plate around the circular disk so as to electrically insulate the inner wall from the circular disk; and an electrically conductive ball disposed in the chamber and having a diameter configured to prevent a further similar conductive ball from fitting into the chamber.