Safety ski binding

Safety ski binding for a ski boot having at least one external engageable member comprising a ski boot supporting member adapted to rotate about a pivot perpendicular to the ski surface and having the shape of a flat case, at least one boot hooking means mounted on said supporting member for movement between a normal operative position in which said hooking means cooperates with said engageable member so as to hold the latter against movement on said supporting member, and an inoperative position to which said hooking means is moved when an abnormal load is applied to the skier's leg, whereby said boot is released in relation to said supporting member resilient system mounted in said supporting member for urging on the one hand said supporting member to its normal position on the ski and on the other hand said hooking means to its operative position, and means forming a kinematic chain between said supporting member, said hooking means and said resilient system so acting that a movement of rotation of the supporting member which tends to move it away from its normal position is attended by a decrease in the force necessary to release said boot hooking means from its operative position, and that inversely a movement of said hooking means to its inoperative position is attended by a reduction in the force tending to hold the pivoted supporting member against rotation.