A junction device between two components, comprising - a hollow body which extends along a longitudinal axis between a first end adapted to be received in a first seat formed in a first component and a second end adapted to be received in a second seat formed in a second component, the junction device comprising an activation element, the hollow body having an opening in one of its ends (206, 208) for insertion of the activation element, the activation element being designed to slide inside the hollow body and wherein the hollow body has, at one end, at least one surface inclined toward the end, at an angle (alpha) of more than 90° with respect to the longitudinal axis of the hollow body, the activation element having an opening arranged substantially at the center, the hollow body having at least one opening on the lateral surfaces and the opening of the activation element and the opening of the hollow body being aligned in the assembled position, the junction device comprising a connecting element and wherein the opening of the activation element accommodates the connecting element and the connecting element has a projection that can be rotatably coupled to the activation element and upon rotation of the connecting element, brings the activation element from a first rest position to a second locked position, in which the end having a surface inclined toward the end of the hollow body at an angle of more than 90° inserted in the seat with a recess is spread apart, and wherein the second end has a cross section defined by two intersecting circles, in which the intersecting surface has a width less than the radius of one of the circles. - a hollow body which extends along a longitudinal axis between a first end adapted to be received in a first seat formed in a first component and a second end adapted to be received in a second seat formed in a second component, the junction device comprising an activation element, the hollow body having an opening in one of its ends (206, 208) for insertion of the activation element, the activation element being designed to slide inside the hollow body and wherein the hollow body has, at one end, at least one surface inclined toward the end, at an angle (alpha) of more than 90° with respect to the longitudinal axis of the hollow body, the activation element having an opening arranged substantially at the center, the hollow body having at least one opening on the lateral surfaces and the opening of the activation element and the opening of the hollow body being aligned in the assembled position, the junction device comprising a connecting element and wherein the opening of the activation element accommodates the connecting element and the connecting element has a projection that can be rotatably coupled to the activation element and upon rotation of the connecting element, brings the activation element from a first rest position to a second locked position, in which the end having a surface inclined toward the end of the hollow body at an angle of more than 90° inserted in the seat with a recess is spread apart, and wherein the second end has a cross section defined by two intersecting circles, in which the intersecting surface has a width less than the radius of one of the circles.