fig1 and 2 illustrate one embodiment of a binding system 1 as proposed by the invention , between a sports device 2 in the form of a sliding or rolling member 3 , such as a ski 4 or a roller - skate for example , and a tread surface 5 for a user &# 39 ; s foot . the tread surface 5 for the user &# 39 ; s foot is preferably a shoe sole 6 of a sport shoe 7 . alternatively , the tread surface 5 for the user &# 39 ; s foot may also be a separate , contoured , largely non - deformable bearing element , designed to support or releasably receive the sport shoe 7 . the binding system i can be used with a whole variety of sports devices 2 . in particular , the binding system i is suitable for joining appropriate sport shoes 7 to skis for cross - country skiing or touring sports . similarly , the binding system 1 may be used with ice skating boots and / or with single or multi - track roller - skates . this being the case , the term sports device 2 should be read as meaning a skating blade or single - or multi - track rollers or a retaining frame for rollers . sports devices of this type are also known as folding ice skates or folding roller skates . the binding system has at least one binding element 11 in the form of lever 67 between the tread surface 5 for the user &# 39 ; s foot and the sports device 2 , which is the only element binding sport shoe to the sports device . the lever 67 is hinge - mounted on an end 18 of a body 22 affixed to sports device 2 , on which a forward end of sports shoe 7 rolls . in the end 17 spaced at a distance therefrom in the longitudinal region — double arrow 9 — the lever 67 is joined to a rolling element 69 in shoe sole 6 via hinge mechanism 45 , i . e . it is hinge - mounted on the shoe sole 6 . the rolling element 69 forming one link 70 of the hinge mechanism 45 can be releasably or non - releasably secured to the underside of the shoe sole 6 or alternatively may be integrated in the shoe sole 6 , i . e . embedded therein . the hinge mechanism 45 forms the pivot axis 46 extending perpendicular to the vertical plane 8 between the front end region 17 of the lever 67 and the rolling element 69 or shoe sole 6 . the hinge mechanism 68 in the other end region 18 of the lever 67 between the latter and the body 22 forms a pivot axis 71 extending perpendicular to the vertical plane 8 . the lever 67 is mounted in a recess 72 of the body 22 . the recess 72 is provided in the front end 36 of the body 22 relative to the direction of travel — arrow 19 — and houses the major part of the lever 67 . the recess 72 forms a guide for the lever 67 . the recess 72 also has a stop element 73 , which restricts the pivoting movement of the lever 67 about the pivot axis 71 . in particular , the stop element 73 prevents the shoe sole 6 and rolling element 69 from . lifting off the body 22 by restricting the pivoting range of the lever 67 about the pivot axis 71 in the direction away from the sports device 2 . in order to restrict the pivoting movement of the lever 67 about the pivot axis 71 in : the direction towards the sports device 2 , the recess 72 may be designed to provide another stop element 74 . clearly , the other stop element 74 could be configured in such a way that the lever 67 moves into abutment directly on the top face of the sports device 2 . the lever 67 is designed so that the pivot axis 46 between the lever 67 and the shoe sole 6 is disposed at a higher lever than the stationary pivot axis between the lever 67 and the body 22 when in the rest or initial position illustrated in full lines in fig1 and 2 . as a result , when the sport shoe 7 pivots relative to the sports device 2 about the pivot axis 71 , the shoe sole 6 is displaced in the direction in which the sports device 2 is moving or travelling — arrow 9 ( see phantom lines in fig1 ). this causes a lengthening of the stride . this effect is produced due to the fact that the pivot axis 46 moves on a circular course 75 about the stationary pivot axis 71 and because the pivot axis 46 between the sport shoe 7 and the lever 67 is disposed at a higher level than the pivot axis 71 . in particular , in the initial or rest position illustrated in full lines in fig1 and 2 , the pivot axis 46 islocated in the top half of the circular course 75 around the pivot axis 71 and , when the heel of the sport shoe 7 is , lifted off the sports device 2 , moves on the circular course 75 in the direction towards the top face 15 and simultaneously in the longitudinal direction of direction of forward movement arrow 9 . plane 8 , the lever 67 has curvature whose center lies above the top face 15 of the sports device 2 . moreover , the lever 67 extends between the body 22 and the shoe sole 6 substantially parallel with the tread surface 5 . specifically , when the binding system 1 is in the initial or rest position , as illustrated , a line joining the pivot axes 71 and 46 subtends an acute angle with a . horizontally extending plane , in particular an angle of approximately 2 ° and 30 °. at least one of the hinge mechanisms 45 , 68 , but preferably both include an energy storage device 76 , 77 , i . e . coil springs 78 , 79 . these energy storage devices 76 , 77 force the tread surface 5 of shoe sole 6 into the initial or rest position in which they extend parallel with the top face 15 of the sports device 2 and apply a defined resistance , which can be overcome , against an upward pivoting movement of the heel of sport shoe 7 relative to the sports device 2 . when the sportshoe 7 is pivoted relative to the sports device 2 , the rolling element 69 of the shoe sole 6 slides along the rolling track 27 of the body 22 in the direction towards the sports device 2 in circular course 75 , and moves the former back away from the sports device 2 when the heel of the sport shoe 7 is placed on the guide member 43 or the top face 15 of the sports device 2 . the guide member 43 and the body 22 are preferably made as a single component , a gap 80 to the shoe sole 6 being left free between the aforementioned components . by preference , the rolling element 69 also has side plates 58 , 59 to form a lateral guide device 30 between the rolling element 69 and the body 22 . the shoe sole 6 of the sport shoe 7 may be of a more bend - resistant design than conventional cross - country sport shoes 7 since the rolling movement can be produced by the binding system 1 proposed by the invention . by making the shoe sole 6 or the entire sport shoe 7 more bend - resistant , a more effective repulsive force from the ground underneath the sports device 2 can be achieved . in addition , the sport shoe 7 is better guided relative to the sports device 2 and the forces applied by the user more efficiently converted into energy to generate forward propulsion with the sports device 2 . due to the combined rotary and translatory coupling between the sport shoe 7 and the sports device 7 afforded by the binding system 1 , performance can be enhanced without detriment to comfort . reference numbers
the invention describes a pivotable binding system for mounting between a sports device and a tread surface for a user &# 39 ; s foot , in which the tread surface is pivotable about an axis extending more or less parallel with the ankle joint of the foot and is displaceable , at least in a part region assigned to the toes , to a position closer to the sports device , and can be joined to the sports device by at least one binding element . the binding element is flexible and is resiliently deformable in a vertical plane .