Swivel connection device

A swivel connection device, comprising:

• a housing body;
• two coupling elements connected to the housing body;
• hinged connection means connected to the housing body;
• wherein the two coupling elements are freely rotatable relative to one another about a main rotation axis defined by the hinged connection means,
• wherein each coupling element, in an operating configuration, is configured to support a respective load directed along a respective load direction substantially parallel to the main rotation axis,
• wherein the housing body defines a plurality of connection seats, and each connection seat of said plurality of connection seats defines a stop wall,
• wherein each of the two coupling elements is inserted into a respective connection seat, against a respective stop wall, along an insertion direction,
• and wherein said insertion direction of each coupling element is in a direction concordant with the load direction of the load supported by a same coupling element.