Piston 1 slides along axis y-y of fixed cylinder a and is connected by turning pairs A and B to links 2 and 3 which, in turn, are connected by turning pairs C and D to links 4 and 5. Links 4 and 5 turn about fixed axes E and F and have segment gears 6 and 7, of equal pitch diameter, which mesh with gear racks e and f. Gear racks e and f slide along fixed vertical guides b-b and d-d, and belong to clamping member 8. The dimensions of the links comply with the conditions: A͞C=B͞D and C͞E=D͞F. Points A and B are symmetrical with respect to axis y-y. When piston 1 moves upward, link 8 has downward translational motion along axis y-y, clamping the band to the fixed surface.
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