Ski boot with improved mechanism to pass from a skiing configuration to a walking configuration

A ski boot comprising a lower part or foot portion, suitable for enclosing the skier's foot and an upper part or leg portion, suitable for enclosing the lower part of the skier's leg,

• wherein the leg portion is hinged to the foot portion so as to be able to rotate in relation to the foot portion around a rotation axis,
• wherein the ski boot comprises means of constraint suitable for selectively blocking and/or unblocking the rotation of the leg portion to the foot portion depending on whether the user wishes to pass from a skiing configuration to a walking configuration,
• wherein
• the constraint means comprise at least one rod having a fixed end hinged only to the foot portion and a mobile end which interfaces with the leg portion,
• wherein the constraint means comprise a support attached to the leg portion and at least one guide, connected to the support and suitable for receiving and guiding the mobile end of the rod, wherein the guide is mobile in relation to the support and to the leg portion so as to be able to move in relation to the leg portion under the thrust of the rod, moving along with the rotation of the rod around its fixed end during the movement of the leg portion in relation to the foot portion;
• wherein the guide comprises a box-shaped body having an entrance slot delimited by walls on all sides, the entrance slot being suitable for receiving with play the mobile end of the rod so as to permit the insertion and longitudinal sliding of the rod in relation to the box-shaped body of the guide;
• wherein the guide is hinged to the support on the side opposite the entrance slot;
• and
• wherein the box-shaped body comprises an aperture which extends beyond the entrance slot, on the side opposite the support, so as to enable the rod to position itself in a direction angled or incident to the guide and to permit the mobile end of the rod to come out of the guide.