Electrical connector with grounded rotating collars

Abstract From the Canadian patent

An electrical connector of the plug and socket type having an independently grounded rotatable collar which is connectable to a ground line potential prior to connection of the live electrical load. The grounding mechanism includes a generally U-shaped spring contact which is compressed on interconnection and which is continually forced into electrical contact with a peripherally surrounding surface of a mating collar. The spring tendency to outwardly expand so as to maintain contact is enhanced by generally triangular radially extending tips of the body of the connector which are also compressed on interconnection and which bias the spring contact radially outward.