Even a small object like a shelf support may hide super-technical surprises, above all when it comes to the "LUNA" model produced by Perin s.p.a.

A support for a shelf must be able to adjustably block the shelf between two plane jaws. It is not easy to achieve this effect by only using a few pieces and at the same time providing a full, practically eternal reliability.

Another challenge that Girotto brilliantly overcomes.

He arranges a vertical T-guide and couples thereto three small plates (see red arrows) having one C-shaped end adapted to slide on the T-guide and the other end with a hole adapted to receive a fixing screw. The plates have their holes threaded and coaxial, thus the screw can engage them all together.

With the plates not screwed (figure on the left), they can slide along the T-guide in order to adjust the jaws of the support (the darker components). When the desired position for the jaws, corresponding to the thickness of the shelf, has been obtained, the screw is tightened, and, thanks to a proper shaping of the top plate, stacks the plates one over the other and makes them tilt on the T-guide. The net result of this tilting is the tightening of the plates in a fixed and stable position (figure on the right).

Three punch-cutted plates + one screw + one section bar T-guide = solid and extra-reliable shelf support.

This is Girotto's equation.