Ski boot

Claim 1

An alpine ski boot of the type which comprises: (a) a shank having two rigid elements (4, 5), including a front element (4) and a rear element (5), at least one of said elements being articulated with respect to the other and with respect to a rigid shell base (1) in a lower zone of said shank (3) to allow movement between a relative open and closed position of said shank (3); (b) an unlockable closure system for retaining said front and rear elements (4, 5) in a position of abutment against a leg of a skier and to enable their passage into open shank (3) position, said system comprising for this purpose a flexible brace (12) which is substantially inextensible in functional connection with at least a first of said elements (4, 5) of said shank (3) in an upper zone thereof and closure means (11, 37, 37'; 40, 37, 37'; 50, 51, 51') cooperating with said flexible brace (12) carried by the second of the elements (4, 5) of said shank; (c) an internal foot support system (8) comprising another flexible brace (10) which is substantially inextensible in functional connection with an internal foot support element (9) and closure means (11, 37, 37'; 40, 37 37'; 50, 51, 51') cooperating with said flexible brake (10), carried by said second of said elements (4, 5) of said shank (3); and (d) means of adjustment for said unlockable closure and said internal foot support systems, said means being constituted by a double entry winding device (14) for each of said flexible braces (10, 12), said winding device comprising a helicoidal-type step-down wheel gear, in which an off-center device solid with a control button (15) carries a toothed pinion (17) which can turn inside a toothed ring (20), coaxial with said control button and equipped with a number of teeth which is one greater than that of the pinion (17), wherein said toothed ring is free to rotate with respect to a single fixed support solid with one of said rigid elements (4, 5) of said shank (3), while one of the braces (10, 12) cooperates with said winding groove (19) thanks to an anchoring device (18) carried by both the pinion (17) and said other brace (10) cooperates with the winding groove (23) thanks to an anchoring device (22) both carried by said toothed ring (20).