Patent ID: 6426826
Filing Date: 2002-07-30
Classification: G09G,H01H

Abstract:
A first switch for electrically connecting between at least one pair of electrical conductors comprising:a suitable substantially non-electrically-conducting fluid medium in the form of a close d loop and having a free upper surface; said closed loop bounded by at least an inner wall and an outer wall, said inner and outer walls being concentric one to the other and comprising an upper inner wall portion and an inner wall portion, respectively, protruding from the mean level of the said fluid free surface; at least one said pair of conductors, one said conductor of said pair comprising a suitable first electrical contact on said upper inner wall portion, and the other said conductor comprising a suitable second electrical contact on said upper outer wall portion; at least one electrically actuable oscillating element immersed in said fluid medium capable of providing at least one travelling wave on said free surface in response to suitable vibrations thereof; an electrically-conductive dynamic contact element, substantially on said free surface and capable of being carried by said wave, said contact element extending at least between said first electrical contact and said second electrical contact; whereby when said oscillating element is suitably vibrated, at least one travelling wave is provided on said free surface carrying the said dynamic element along said free surface element alternately to a position providing electrical contact between said first contact and said second contact and to a position in which said first contact and said second contact are electrically disconnected.