Tightening and adjusting device particularly for ski boots

A tightening and adjusting device particularly for ski boots including a shell having an instep portion, and a leg portion defining a quarter, including two sections articulated to each other, said device comprising entrainment means, actuating means, housing means, traction means, adjustment means and at least one stay member, said stay member defining a working length and having an entrainable portion and at least one end said at least one end being attached to one of said two sections, said entrainable portion being adapted to be entrained by said entrainment means, said entrainment means being adapted for co-operation with said actuating means for adjusting said working lengthy defined by said stay member, said actuating means comprising an axle having rigidly associated therewith an inclined toothed gear wheel, said axle and said gear wheel being actuable by a ratchet lever, said device further comprising a presser element adapted for exerting pressure at said instep portion, at least one link element including a tractable portion, defining a working length dimension and having attached to said presser element, at least one end, said housing means being adapted for at least partially containing said entrainable portion of said stay member said actuating means and said entrainment means, said traction means including a thread formation, a sleeve having an outer flange, and a guided block, said thread formation being threaded into said sleeve, said sleeve being rotatably arranged in said guided block, said outer flange of said sleeve being contained in said guided block to prevent relative axial movement of said sleeve with respect to said guided block, said adjustment means including a gear, and a worm including a middle pin said gear being formed on said sleeve, said-middle pin protruding from said guided block for allowing manual actuation thereof, which by obtaining the rotation of said sleeve determines a mutual position of said guided block with respect to said axle, prior to rotation of the latter by actuation of said ratchet lever, said adjustment means being adapted for varying said working length dimension defined by said at least one link element independently of said actuating means.