Patent ID: 8201312

Claim:
A working equipment comprising an external working head and an internal working head, both arranged for applying a thrust on a structure having a wall which in turn comprises an external side and an internal side opposite to said external side; said thrust being opposite to the thrust applied to a same part by the other of the internal and external working head, wherein the external working head is provided with a pressure device comprising a slide which holds a piston head comprising a supporting plate, an intermediate plate and a fixed base, the supporting plate being attached to the intermediate plate and the intermediate plate being attached to the fixed base, wherein the supporting plate has a tool passage opening, wherein a suction chamber is arranged inside the intermediate plate and inside the fixed base, wherein the tool passage opening and the suction chamber are arranged in such a way that a tool with which a drilling operation has to be executed can pass through them, wherein the intermediate plate is fixed to the fixed base to be able to translate in a direction perpendicular to the fixed base itself, and rotate around rotation axes parallel to said fixed base, wherein a load detector is interposed between the intermediate plate and the fixed base for measuring the thrust applied by the respective one of the internal and external working head on said structure, wherein said external working head is configured to move towards the external side of the wall of the shell structure, until a thrust is applied to said external side, equal to a predetermined contact threshold thrust; wherein said internal working head is configure to move towards the internal side of the wall of the shell structure until the load detector detects a predetermined variation of the thrust applied to the wall of the shell structure by the external working head; the working equipment is configured such that by acting on the external working head, applying to the external side of the shell structure a thrust in the direction of the thickness equal to a compression force necessary for drilling, and greater than the predetermined contact threshold thrust.