Device for supplying an electric receiver whose position on a surface is variable

A device for supplying electric current to at least one electric receiver positioned in variable locations on a surface comprising:

• (a) a networkof parallel electric conducting strips disposed on said surface, said strips each having the same width, and being spaced apart from one another by a given distance, said network covered by at least one layer of insulating material, including:
• (1) a first assembly of strips adapted to be connected to one pole of a source of electric current;
• and
• (2) a second assembly of strips adapted to be connected to another pole of said source of electric current, said strips of said second assembly being imbricated alternately with said first assembly of strips;
• (b) a movable current pick-up having at least three current sensors capable of coming into contact with said strips;
• and
• (c) a circuit for supplying the receiver when at least one of said at least three sensors comes into contact with one conducting strip in said first and second assemblies and at least another of said at least three sensors comes into contact with a second conducting strip in the other of said first and second assemblies, said circuit having a plurality of inputs connected to said at least three sensors and at least one output connected to said at least one receiver;
• wherein said at least three sensors comprise contact styluses of substantially equal length adapted to pass through said at least one layer of insulating material and wherein said at least three styluses are disposed at the apices of an equilateral triangle, wherein the length of each side of said equilateral triangle is substantially equal to said given distance plus an amount substantially equal to the width of said conducting strips.