Electric power distribution track

An electric power distribution track comprising:

• an elongated duct having the cross section of an inverted U-shaped configuration with a top wall, a pair of lateral sidewalls, and a lengthwise bottom opening;
• said duct having an electrically grounded metal member extending longitudinally along the duct in at least the portion thereof adjacent the lengthwise bottom opening and said duct having a covering of plastic insulation sheath of electrically insulative plastic material;
• a plurality of spaced apart conductors extending longitudinally along the duct at positions spaced inwardly from the interior surface of the duct with at least one of said conductors carried along said top wall;
• insulating support members for the conductors and secured to the interior surface of the duct;
• an upwardly facing earthing surface formed by a portion of the metal member protruding through the plastic insulation sheath and in electrical contact with said grounded metal member and extending along at least one side of said lengthwise bottom opening parallel to said conductors so that an adaptor plug inserted within said lengthwise bottom opening can be positioned to contact both said earthing surface and said at least one conductor carried along said top wall so as to exert a downward force from said at least one conductor and thus to cause a better contact with said earthing surface.

An electric power distribution track comprising:

• an elongated duct having the cross section of a generally downwardly disposed U-shaped configuration with a top wall, a pair of lateral sidewalls, and a lengthwise bottom opening, said duct including a correspondingly shaped electrically grounded metallic core channel member covered by an insulation sheath of an electrically insulative plastic material;
• a plurality of spaced apart conductors extending longitudinally along the duct at positions spaced inwardly from the interior surface of the sheath with at least one of the conductors supported on the top wall and at least one of the conductors on each of the opposite sidewalls;
• a corresponding number of support members integrally formed with said sheath to project inwardly of the duct for receiving said three conductors at the inward end portions of the support members;
• each of the conductors being shaped as an elongated hollow member with an annular cross section, and each of the support members having at its inner end portion a rail of C-shaped cross section with an inwardly oriented slit, said conductor being snugly received within the rail and exposed to the inside of the duct through the slit with the support extending from the side diametrically opposite from the slit;
• connection ribs each integrally bridging between the support member on the top wall and the support member on each of said sidewalls for integral connection therebetween, each of said connection ribs extending in a non-linear manner between the adjacent ones of the support members such that the connection ribs are capable of resiliently stretching when the track is subjected to such an external force to deformingly spread outwardly the sidewalls and the support members belonging thereto;
• a pair of upwardly facing earthing surfaces formed by a portion of the metallic core channel protruding through said insulation sheath, one earthing surface on each side of said lengthwise bottom opening and extending parallel to said conductors so that an adaptor plug inserted within said lengthwise bottom opening can be positioned to contact said earthing surfaces and said at least one conductor supported on the top wall so as to exert a downward force from said at least one conductor and thus to cause a better contact with said earthing surface.