Abstract:
A ski binding apparatus and method for facilitating the mounting of a ski binding onto a ski. The ski binding apparatus of the invention includes a body which carries a jaw for retention of a ski boot and a base affixed to the lower portion of the body. The base has holes for receiving screws for mounting the binding to the ski. Further, the base has a lower surface, a frontal surface, and a longitudinal groove formed in the lower surface. The longitudinal groove extends to and opens into the lower surface and the frontal surface of the base. A retention element is slidably received within the groove and extends therefrom in a transport and preassembly position of the binding apparatus. A fastener is held in the retention element in the extended position such that, when the binding is mounted upon the ski, the fastener secures the retention element to the ski, after which the binding is slid forwardly, receiving the retention element within the groove and, thereafter, additional fasteners complete the attachment of the binding to the ski.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a release binding for a ski and a means and a method for attaching the binding to a ski. 
     2. Description of Background and Other Information 
     Presently known safety bindings for skis which are adapted to maintain the front of a boot (toe bindings) or the rear of the boot (heel bindings), generally include a body or housing on which a jaw is mounted for retention of the boot, this body being solidly affixed, at its lower part, to a base by which the safety binding is mounted on the ski. The mounting of the body of the binding is achieved by means of screws which go through holes bored in the base and which are screwed into the upper surface of the ski. 
     For the mounting of certain safety bindings, and particularly front bindings, a &#34;hidden&#34; screw is frequently utilized, i.e., a screw which is not accessible once the binding is mounted on the ski. The &#34;hidden&#34; screw is screwed into the ski before the binding is secured in its final position. It is a shouldered screw having a head with a large diameter extended by a body with an intermediate diameter, and a threaded rod with a small diameter. Once it is thoroughly screwed into the ski, the head of the screw is maintained at a height determined with respect to the surface of the ski, this height corresponding to that of the body of the screw. 
     This &#34;hidden&#34; screw cooperates with a slot in the shape of a buttonhole which is formed in the lower surface of the base of the binding. The slot includes two parts, namely a circular part with a diameter greater than that of the screw head so as to permit the passage of the head through it, and a longitudinal slit opening into the circular part and having a width equal to the diameter of the screw body. 
     The mounting of a safety binding maintained by such a &#34;hidden&#34; screw requires a certain number of operations. In the first place, the person who mounts the binding, after having opened the packing box for the binding, must find in the box the &#34;hidden&#34; screw which, because of its cooperation with the buttonhole-shaped slot, has a certain configuration. After that, the operator must thoroughly screw this screw into a front hole provided for this purpose in the upper surface of the ski. Then he or she must take hold of the binding, apply it flat on the ski and displace it, feeling his or her way, until he or she is able to make the circular opening of the buttonhole-shaped slot correspond with the head of the &#34;hidden&#34; screw. At this moment he or she presses on the binding so as to engage the head of the &#34;hidden&#34; screw in the circular opening of the buttonhole and he or she then slides the binding longitudinally so that the body with an intermediate diameter which is provided under the screw head engages in the longitudinal slit of the slot. The operator then completes the mounting of the binding by the screwing of other screws provided for this purpose. 
     If such a method of mounting is preferable because the &#34;hidden&#34; screw does not require any particular arrangement in the upper part of the binding, it still has the disadvantage that the hidden screw must be individually set apart in the packing box for the binding to be screwed to the ski. Moreover, this screw can be lost, which poses a particular problem, given the particular configuration that the &#34;hidden&#34; screw has in order to be able to cooperate with the buttonhole-shaped slot. 
     Furthermore, there are known safety bindings which are provided with means for maintaining the fixation screws in place in their respective holes provided in the base. Such a binding is described, for example, in French Patent Application No. 2,208,692. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide a binding apparatus for a ski including a body, the body carrying a jaw for retention of a boot; a base affixed to the lower portion of the body, the base having holes for receiving screws for mounting the binding to the ski, the base also having a lower surface, a frontal surface, and a longitudinal groove formed in the lower surface, the longitudinal groove extending to and opening into the lower surface and the frontal surface of the base, the longitudinal groove having a slot which extends to the lower surface and a channel larger than the slot, one of the screws being a hidden screw located within the groove in a mounted position of the binding apparatus upon the ski; and a small bar slidably mounted and partially engagable within the longitudinal groove in a transport position of the binding apparatus, i.e., in a mounting position of the binding apparatus, the small bar and the groove having generally complementary transverse cross-sections for preventing substantial movement of the small bar in a direction perpendicular to the lower surface of the base, the small bar having a hole within which the hidden screw is maintained, exteriorly of the base, in the transport position of the binding apparatus. 
     Preferably, the hole of the small bar has a diameter only slightly smaller than that of the hidden screw. 
     Further, the small bar has a lower surface, and, in the transport position, the hidden screw has a point which point protrudes slightly beneath the lower side of the small bar. 
     According to a particular aspect of the invention, the small bar has a lower part which has a width which is generally equal to the width of the slot of the longitudinal groove, the channel of the longitudinal groove has a width larger than the width of the slot. The small bar has an upper part tightly engaged in the channel of the longitudinal groove. 
     In a particular embodiment of the invention, the channel of the longitudinal groove and the upper part of the small bar have respective transverse cross-sections in the shape of an isosceles trapezoid, a small lower base of which the width is equal to the width of the slot of the longitudinal groove and of which the lower part of the small bar, the small bar and the groove constituting a dovetail assembly. 
     Further according to the preferred embodiment of the invention, the small bar and the longitudinal groove have flat lateral sides. 
     Still further according to the preferred embodiment of the invention, the small bar and the longitudinal groove each has a respective rounded end. 
     In a particular aspect of a preferred embodiment, the small bar has an inner end, a lower surface, and a centering pin projecting downwardly from the lower surface, the centering pin being located between the inner end of the small bar and the hole for the hidden screw. 
     According to another aspect of a particular embodiment of the invention, the small bar has an inner end, a lower part with lateral vertical sides and a pair of laterally opposed recesses located between the inner end of the small bar and the hole for the hidden screw, the slot of the longitudinal groove has a pair of lateral walls and a pair of laterally opposed elastic lips extending from the lateral walls of the slot inwardly of the groove for forming a ratchet relationship with the laterally opposed recesses of the lower part of the small bar. 
     Alternatively, the small bar can be provided with projections and the groove can be provided with cooperating recesses. 
     Still further according to a particular embodiment of the invention, the small bar has a lower part with lateral vertical sides has a pair of laterally opposed projections, the slot of the longitudinal groove has a pair of lateral walls with a pair of laterally opposed recesses cooperating with the pair of laterally opposed projections of the small bar for maintaining the small bar, either in an extended position in relation to the base, or in an engaged position in the longitudinal groove of the base 
     In a further embodiment of the invention, the lower part and the upper part of the small bar have a junction which is inclined from top to bottom towards the front of the base, and the slot and the channel of the longitudinal groove have a junction has an incline equal to the junction of the lower part and the upper part of the small bar. 
     In a still further embodiment of the invention, the small bar and the longitudinal groove have a shape, in plan view, which converges from front to rear. 
     In a particular aspect of an embodiment of the invention, the small bar has a front surface, a lower rear surface and a bevelled lower surface extending from the lower rear surface to the front surface, the bevelled surface being positioned between the hole for the hidden screw and the front surface of the small bar. Further, the base has a front lower bevelled surface which coincides with bevelled surface of the small bar. 
     In a still further embodiment of the invention, the longitudinal groove and the small bar have respective rear ends in which the length of the small bar is slightly less than that of the longitudinal groove so that a slight gap exists between the rear end of the small bar and the rear end of the longitudinal groove when the small bar is completely positioned within the longitudinal groove of the base. 
     It is a further object of the present invention to provide a ski binding apparatus including a base for engagement with the upper surface of a ski and for receiving means for attaching the base to the ski, the base having a lower surface and an end surface, the base further having a longitudinally extending groove which opens in the lower surface and the end surface, and a retention element for engagement within the longitudinally extending groove of the base for retaining a fastener outside of the base prior to assembly of the base upon the ski, and for retaining the base upon the ski after assembly of the base upon the ski, the retention element including means for facilitating the fastening of the fastener to the ski. 
     The lower surface of the base includes a forward lower surface and a rearward lower surface, the forward lower surface and the rearward lower surface being connected at a transverse edge, whereby the forward lower surface and the rearward lower surface form an angle at the transverse edge of slightly more than 180°. 
     It is a still further object of the invention to provide a retention assembly for securing a ski binding upon a ski including a fastener and a retention element for engagement within a longitudinally extending groove of a base of the ski binding, the retention element having a hole within which the fastener is positioned and retained by the retention element outside of the base prior to assembly of the base upon the ski, the retention element including means for retaining the base upon the ski after assembly of the base upon the ski and for facilitating the fastening of the fastener to the ski. 
     It is a still further object of the invention to provide a method of assembling a ski binding to a ski, the ski binding having a base with a longitudinally extending groove opening in a lower surface and an end surface of the base, a retention element retaining a threaded fastener therein, the retention element extending from the end surface, the method including the steps of (a) placing the ski binding, with the retention element extending from the end surface, upon the ski at a first predetermined location on the ski; (b) screwing the threaded fastener into the ski, thereby securing the threaded fastener to the ski; (c) displacing the ski binding longitudinally toward the retention element for receiving the retention element within the longitudinally extending groove; (d) stopping longitudinal displacement of the ski binding at a second predetermined location With the retention element being retained in the longitudinally extending groove to thereby fasten a first portion of the ski binding onto the ski; and (e) fastening a second portion of the ski binding onto the ski. 
     Further, the method of the invention includes providing a hole in the ski for receiving the threaded fastener, whereby the first predetermined location at which the ski binding is placed is determined such that the threaded fastener and the hole are substantially vertically aligned. 
     Further, the step of fastening a second portion of the ski binding onto the ski includes screwing a plurality of additional threaded fasteners through the base and into the ski. 
     Still further, the method includes the step of providing a plurality of holes in the ski for receiving respective ones of the additional threaded fasteners, whereby the second predetermined location at which longitudinal displacement of the ski binding is stopped is determined such that the additional threaded fasteners and their respective holes are substantially vertically aligned. 
     Still further, the step of placing the ski binding upon the ski at a first predetermined location on the ski includes locating a locating pin, extending from a lower surface of the retention element into a pilot hole in the ski provide a method and a means for facilitating the mounting of a ski binding onto a ski. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above and additional objects, characteristics, and advantages of the present invention will become apparent in the following detailed description of preferred embodiments, with reference to the accompanying drawings which are presented as non-limiting examples, in which: 
     FIG. 1 is an elevation view, partially in vertical and longitudinal cross-section, of the front binding according to the invention; 
     FIG. 2 is a view in perspective, from the front and below, of the front binding of FIG. 1 without the small bar carrying the &#34;hidden&#34; screw; 
     FIG. 3 is a perspective view of the front binding of FIG. 1, without the small bar, turned upside down; 
     FIG. 4 is a horizontal cross-sectional view, taken along line IV--IV of FIG. 1; 
     FIG. 5 is a perspective view of the small bar holding the &#34;hidden&#34; screw; 
     FIG. 6 is a side elevation view of the small bar holding the &#34;hidden&#34; screw; 
     FIG. 7 is an end elevation view of the inner end of the small bar; 
     FIGS. 8-11 are elevation views, in partial vertical and longitudinal cross-section, illustrating the different phases of the mounting operation of the front binding on the ski; 
     FIG. 12 is a view from below of a variation of the fabrication of the small bar holding the &#34;hidden&#34; screw. 
     FIG. 13 is a side elevation view of the small bar in FIG. 12; 
     FIG. 14 is a view from below of the small bar in FIGS. 12 and 13 partially engaged in the lower groove of the binding; 
     FIG. 15 is an elevation view, in partial vertical and longitudinal cross-section, of a front binding including a variation in the construction of the small bar holding the &#34;hidden&#34; screw partially engaged in the receiving groove; 
     FIG. 16 is a view from below of a variation of a fabrication of the forward part of the front binding in which the small bar holding the &#34;hidden&#34; screw is retained; 
     FIG. 17 is an elevation view of a variation on the fabrication of the small bar holding the &#34;hidden&#34; screw; 
     FIGS. 18 and 19 are partial vertical longitudinal cross-sections of the front of the front binding containing the small bar of FIG. 17, before and after the screwing of the &#34;hidden&#34; screw and the ski, respectively; 
     FIG. 20 is a view from below of another variation on the fabrication of a small bar holding the &#34;hidden&#34; screw; 
     FIG. 21 is an elevation view of the small bar in FIG. 20; and 
     FIG. 22 is a view from below of the small bar in FIGS. 20 and 21, partially engaged in the lower groove of the binding. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The present invention has, as an objective, the facilitation of the mounting of a binding of the &#34;hidden&#34; screw type on a ski and to provide an improved binding of this type. 
     The present invention concerns improvements in the releasable binding held on the ski by a &#34;hidden&#34; screw and with the objective of considerably facilitating the mounting operation of the binding on the ski. 
     To this end, the present invention includes a ski binding having a body or housing on which a jaw is mounted for retention of the boot and which is solidly affixed, at its lower part, to a base. The base is mounted on the ski by means of screws of which certain ones go through holes located in the base and of which one constitutes, after mounting, a screw which is engaged in a lower longitudinal groove which is formed in the lower surface of the base into which it opens. The groove in the base of the binding has an enlarged portion within the base of the binding, communicating with a slot in the lower portion of the base of the binding. The lower longitudinal groove of the base opens into the front of the base which is situated opposite the binding jaw. Within the groove a small bar is partially engaged, longitudinally slidable therein. The bar projects beyond the front of the base, the small bar and the groove having transverse sections of respectively complementary shapes, preventing any disengagement of the small bar outside of the groove in the vertical direction, that is, perpendicular to the lower side of the base. Thereby, the screw to be hidden is positioned, during transport and mounting of the binding, in a vertical hole provided in the external part of the small bar projecting from the outside of the base. 
     The binding according to the invention offers the advantage that after screwing the base of the binding onto the ski, it is the assembly of the small bar carrying the &#34;hidden&#34; screw which constitutes an interface between the ski and the binding frame. The entire periphery of the small bar in contact with the base is used for stress transmission. As a result, stress is distributed on a larger surface than in the case where retention of the binding frame is ensured by a screw head engaged directly in the bottom of a groove. 
     The releasable binding, which is designated in its entirety by the reference numeral 1 in FIG. 1, is intended to hold the front of a boot on a ski. It contains a front binding element with, on its upper part, a body 2 to which a movable retention jaw 2a is provided in the rear, and a lower part, a base 3 intended to be mounted on a ski by means of a screw. The upper body 2 of the front binding element can form a single unit with the base 3 or the body can be separate from the base, with a lengthwise sliding connection. 
     The base 3 contains a forward facing side 3a which is situated opposite the retention jaw 2a. The lower side of the base is not flat but has a forward part 3b and a rear part 3c inclined towards each other, forming a dihedral open towards the top and an adjacent obtuse angle of slightly less than 180°. The front part 3b and rear part 3c are connected by a transverse edge 3d, constituting the edge of the dihedral. 
     The mounting of the front binding element 1 is ensured by means of a front screw 4 intended to be a &#34;hidden&#34; screw and at least one back screw 5. For this purpose, the front binding 1 is delivered, in its packing case, with the front screw and back screws 5 held in place, as represented in FIG. 1. 
     The back screws 5 are held in the holes in the base 3 by malleable retention devices of any appropriate type, as is described in French Patent Application 2,208,692, for example. 
     The front screw 4 is held in front of base 3 by a small holding bar 6 with a vertical hole 7 in which the screw 4 is engaged and held, preferably with its point slightly projecting under the lower side of the bar 6. The small bar thereby performs the function of retaining the hidden screw prior to assembly of the binding element to the ski. For this purpose, the hole 7 has a diameter only slightly less than that of the screw 4. The small holding bar 6, preferably made from a plastic material, is slidingly engaged lengthwise in a longitudinal groove 8, recessed in the lower forward port 3b of the base 3 which ends in the forward side 3a of the base 3, as is seen more easily in FIGS. 2 and 3. 
     The small bar 6 and the groove 8 are preferably of the same length l and their respective transverse sections are of complementary shape which prevent any disengagement of the small bar 6 outside of the groove 8 in the vertical direction, that is, perpendicular to the lower side of the base 3. This groove 8 includes a lower lengthwise slot 8a of a width equal to the width of the lower part 6a of the small bar 6 and of which the internal or rear end is located at a distance d1 from the axes of the holes in which the rear screws 5 are held. In addition, the internal or rear end of the lower part 6a of small bar 6 is located at a distance d2 from the axis of hole 7 receiving the front screw 4. Above the lower lengthwise slot 8a extends a recess or upper lengthwise channel 8b of width b larger than the width a of the lower lengthwise slot 8a. 
     In the recess or upper channel 8b , which can have any appropriate form of transverse section, is engaged the upper part 6b of the small bar 6, which has the same transverse section. In the non-limiting constructional form represented in the drawing, this transverse section has the shape of an isosceles trapezoid with a small lower base of which the width is equal to that of the slot 8a. The form of the small bar 6 and the groove 8 constitute, at their upper part, a dovetail assembly. However, any other transverse section could be provided for the channel 8b of the groove 8, particularly rectangular (in which the transverse section of the groove 8 has the form of a T), circular, etc. 
     The internal or rear ends of the small bar 6 holding the &#34;hidden&#34; screw 4, and of the groove 8 of the base 3 can terminate in flat transverse sides. According to a particularly advantageous form of the invention, the internal or rear end 6c of the small bar 6, and 8c of the groove 8, can have a rounded convex shape turned towards the rear, as seen in the drawing. 
     Preferably, the small bar 6 contains, on its lower horizontal side 6d, a centering pin 9 projecting downwardly, between the internal or rear end 6c and the hole 7 at a distance d3 from the axis of the hole 7. 
     With respect to FIGS. 8-11, the successive operations which occur in the mounting of the front binding element 1 on the upper surface of ski 11 will now be described. Ski 11 is preferably pierced by the pilot, or lead, holes 11a and 11b into which the screws 4 and 5 are screwed to lock the front stop 1. The axis of the front lead hole 11a, which receives the hidden screw 4, is pierced at a distance x from the axis of the rear lead holes 11b which receive the rear screw 5; distance x equals the sum of the distance d1 extending between the internal or rear end of the lower slot 8a of groove 8 and the axis of each hole in the base 3 receiving a rear screw 5, and the distance d2 between the axis of hole 7 of the small bar 6 receiving the &#34;hidden&#34; screw 4 and the internal or rear end of the lower part 6a of the small bar 6. A blind hole 11c is also provided in the upper surface of the ski, positioned at a distance d3 behind hole 11a, aligned with the latter on the longitudinal axis of the ski. 
     Once the front stop is a removed from its packing case, it is placed on a ski so that its base 3 is applied flat to the upper side of the ski 11 with respect to its rear surface 3c. As a result, its forward surface 3b and, consequently, the small bar 6, are slightly inclined from the bottom to top and from back to front as illustrated in FIG. 8. The front stop 1 is then brought into a position where the centering pin 9 is engaged in the blind hole 11c and, as a result, the front screw 4 held by the small bar 6 in front of the forward side 3a of base 3, is placed just above the hole 11a intended to receive it, the small bar 6 always remaining slightly raised. In this position, the point of screw 4, projecting under the lower side of the small bar 6, may already be slightly engaged in the entrance of the lead hole 11a. 
     The second phase of the mounting operation consists of screwing the screw 4 in the lead hole 11a with an appropriate tool such as a screwdriver 12. During the screwing, the small bar 6 is gradually applied to the upper surface of the ski 11, in alignment with the longitudinal axis of the ski, ending by being firmly locked on this surface, as seen in FIG. 9. This occurs by a slight forward tilting of the assembly of the binding 1 around the edge 3d of the dihedral formed by the lower surfaces 3b, 3c of the base 3, and in elevation of the rear part of the base 3. 
     The third phase of the mounting operation of the front stop 1 consists, as illustrated in FIG. 10, of moving the stop 1 towards the front. The effect of this shift is that the lengthwise groove 8 slides tightly on the small bar 6 attached to the ski and constitutes a lengthwise guiding mechanism. This forward movement continues until the rear or internal end 8c of the groove 8 of the base 3 comes into contact with the rear or internal end 6c of the small bar 6. In this position, the front screw 4 is completely &#34;hidden&#34; under the base 3, and the rear screws 5 are then situated just above the corresponding lead holes 11b in the upper side of the ski 11, because of the equivalence of the distances x and d1+d2, as indicated in FIG. 10. 
     The last phase of the mounting operation consists of screwing the rear screws 5 in their lead holes 11b with a screwdriver 12. The screwing of the rear screws 5 creates a tilting of the rear part of the front binding element 1 towards the ski, which eliminates the vertical play between the upper part 6b of the small bar 6 and the upper channel 8b of the groove 8. Because of the tilting movement of the binding element around the edge 3d of the dihedral 3b, 3c, the inclined sides of the upper channel 8b of the groove 8 are applied with great pressure under the inclined sides of the upper part 6b of the small bar 6, which ensures the firm maintenance of the front stop along the entire length of the small bar 6. 
     In the variation represented in FIGS. 12, 13, and 14, the lateral vertical sides of the lower part 6a of the small bar 6 are hollowed with a pair of screw recesses or notches 6e, situated between the internal or rear end 6c of the small bar 6 and the hole 7 for the &#34;hidden&#34; screw 4. In these screw notches 6e are engaged two opposing elastic lips, or dovetail keys, 13, forming a ratchet connection, the lips being contiguous with the lateral walls of the lower slot 8a of the groove 8. The lips 13 are notched and arched to form a projection in relation to the lateral walls of the groove 8, directed towards the interior of the latter. In the transport position, as represented in FIG. 14, the dovetail keys 13 are elastically engaged in the two screw notches 6e, thus constituting a tight holding connection containing the small bar 6 in its extended position. In this extended position, the small bar 6 is prevented from any outward movement by the elastic keys 13 forming stop catches against the notches 6e . In the other direction, towards the interior of the base 3, the small bar 6 is held by the front screw 4 which, abutting against the forward side 3a of the base 3, prevents movement of the small bar 6 into the groove 8. During the mounting of the front binding element on the ski, when the body of the binding element is pushed forward after screwing the forward or &#34;hidden&#34; screw 4, the elastic keys 13 are pushed back towards the outside and slide the length of the lateral vertical sides of the lower part 6a of the small bar 6. 
     In the variation illustrated in FIG. 15, the junction 6g between the lower right part 6a and the upper part 6b, forming a dovetail with the small bar 6, is inclined from top to bottom and from back to front, in the direction of the forward side 3a and, likewise for the junction 8d between the lower right slot 8a and the dovetail upper channel 8b of the groove 8, the inclination of the two junctions 16 and 8d being the same. When the small bar 6 is in the extended position, as in FIG. 15, there is a slight vertical play towards the bottom between the small bar 6 and the base 3. On the other hand, this play disappears completely when the base 3 is totally engaged on the small bar 6. 
     In the variation illustrated in FIG. 16, the small bar 6 and the groove 8 present, in a plan view, a shape converging towards the rear of the binding. As a result, there is a slight transverse horizontal play when the small bar 6 is in the extended position, as is seen in FIG. 16. 
     The devices illustrated in FIGS. 15 and 16 can be used in combination, which permits both a vertical play and a transverse horizontal play when the bar is in the extended position. 
     In the variation of the construction represented in FIGS. 17, 18 and 19, the small bar 6 has on its lower side a bevel 6h extending between the lower horizontal side 6d of small bar 6 in its external frontal side 6i. The lower beveled side 6h is formed in the area between the hole 7 and the external frontal side 6i. In the same way, the bevelled inclined side 3e is designed in the front of the lower side 3b of the base 3, this inclined bevelled side 3e extending between the lower side 3b and the frontal side 3a. As a consequence, when the base 3 is completely engaged on the small bar 6, as represented in FIG. 19, the two lower bevelled inclined sides 6g and 3e define a free space in the zone e where the ski can bend. As a result, the ski can bend from its spatula almost to the point where the front &#34;hidden&#34; screw 4 is engaged. 
     Preferably, the small bar 6 is slightly shorter than the groove 8 so that when the base 3 is completely engaged on the small bar 6, as illustrated in FIG. 19, a slight play exists between the rear end 6c of the small bar 6 and the rear end 8c of the groove 8. As a result, when the ski bends, a slight sliding is possible between the small bar 6 and the base 3, which diminishes the obstruction to bending of the ski caused by the presence of the binding 1. 
     In the variation of construction represented in FIGS. 20, 21 and 22, the lateral vertical sides of the lower part 6a of the small bar 6 have opposing enlargements or projections 6f, which are formed near the rear end 6c of the small bar 6. These projections 6f are designed to engage in two pairs of opposed recessed 14 and 15 which are formed in the lateral walls of the lower slot 8a of the groove 8. The first pair of recesses 14 is located near the forward side 3a of the base 3, while the second pair of recesses 15 is near the rear end 8c of groove 8. In the transport position, illustrated in FIG. 22, the two projections 6f of the small bar 6 are engaged respectively in the two housings 14 near the frontal wall 3a, thus constituting a tight connection holding the small bar 6 in its extended position. During the mounting of the front binding element on the ski, when the body of the binding element is pushed forwardly, after screwing in the front or &#34;hidden&#34; screw 4, the lateral walls of the lower slot 8a of the groove 8 elastically yield and are pushed slightly outwardly, which permits the base 3 to slide lengthwise on the small bar 6, until the projections 6f are engaged in the second pair of housings 15 near the rear end 8c of the groove 8. 
     The device described above could be reversed, that is, the lateral vertical sides of the lower part 6a of the small bar 6 could be hollowed with two housings instead of the projections 6f, the lateral walls of the lower slot 8a of the groove 8 then having, instead of the recesses 14 and 15, pairs of corresponding projections which engage in the recesses provided in the small bar 6. 
     Finally, although the invention has been described with reference of particular means, materials and embodiments, it is to be understood that the invention is not limited to the particulars disclosed and extends to all equivalents within the scope of the claims.