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1. An electrical connection device which comprises a container comprising at least two seats, each seat being structured and arranged to contain an electrical connection element comprising a first sliding contact element and a second sliding contact element, each connectable to a respective electric cable, the electrical connection device further comprising a tubular element inserted inside the container wherein the tubular element and the container are rotatable relative to each other, the first sliding contact element being integrally connected to the container and the second sliding contact element connected integrally to the tubular element to make a sliding contact between the first and second sliding contact elements, wherein each seat comprises two walls structured and arranged to contain the electrical connection element, wherein each electrical connection element comprises an elastic element structured and arranged to keep in contact the first sliding contact element and the second sliding contact element, wherein the sliding contact elements and the elastic element have an annular shape with the tubular element inserted inside them, wherein the first and second sliding contact elements are rotatable on their axis and the annular surfaces of the first and second sliding contact elements are superimposed on each other, so as to slide on each other when the tubular element and the container are made to rotate relative to each other.
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