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Pub. No.:    WO/2005/105658    International Application No.:    PCT/EP2004/013522
Publication Date: Nov 10, 2005 International Filing Date: Nov 29, 2004
IPC: B67B 7/04
Applicants: MARCHIGNOLI, Marisa
FERRARI, Ruggero
Inventors: FERRARI, Ruggero
The invention relates to corkscrews for stoppers made from cork or synthetic material, comprising an external skirt (4) with a centering and abutting element (8), for a bottle neck at the base thereof. Two toothed wheels (7) are mounted on the external skirt, operated by levers (6) and engaging with a toothed cylinder (9) which slides vertically. The cylinder (9) is sealed at the base thereof by a flange (12) with an aperture (14) formed therein into which a spiral (23) is inserted which is freely supported by a piston (17), sliding within the toothed cylinder (9), which may be displaced by means of a toothed wheel (20) mounted on the internal cylinder (9).