Formed by a base (2) in a "U" cross section with a bottom (4) and side walls (5), finishing at one end in a larger spherical sector of the base (12) and at the other in a smaller spherical sector of the base (13), and a cover (3) with a curved cross section finishing at one end in a larger spherical sector of the cover (17) and at the other in a smaller spherical sector of the cover (18). ??Once the cover (3) and the base (2) are joined, the larger spherical sectors (12) (17) complement one another to form a larger spherical surface, and the smaller spherical sectors (13 (18) complement one another to form a smaller spherical surface designed to remain within the interior of the larger spherical surface thereby forming a hinge joint. Figures 6 and 11. IMAGE
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