Lighting apparatus, power-supply apparatus, coupling apparatus and lighting system

A power-supply apparatus comprising:

• a connection body with an electric power supplier adapted for being electrically connected to an electric power-supply network;
• wherein said connection body is adapted for being mechanically and electrically connected to a supporting and power-supply guide that extends in a longitudinal direction (L),
• wherein said connection body is shaped like an elongated box and is adapted for being inserted into and extracted from said guide at least in a direction (P) perpendicular to the length thereof and to said longitudinal direction, and
• wherein said connection body comprises two mechanical contacts and two electrical contacts, and two elastic means that act on said two mechanical contacts or on said two electrical contacts so as to allow them to move back-and-forth due to the insertion into and the extraction from said guide.

A coupling apparatus comprising:

• a connection body with many electrical conductors for transferring electric power supply and/or electrical control signals;
• wherein said connection body is adapted for being mechanically and electrically connected to a supporting and power-supply guide that extends in a longitudinal direction (L),
• wherein said connection body is shaped like an elongated box and is adapted for being inserted into and extracted from said guide at least in a direction (P) perpendicular to the length thereof and to said longitudinal direction, and
• wherein said connection body comprises two mechanical contacts and two electrical contacts, and two elastic means that act on said two mechanical contacts or on said two electrical contacts so as to allow them to move back-and-forth due to the insertion into and the extraction from said guide.