Slide device for adjusting the relative elements of a ski boot
FIELD OF THE INVENTION 
     The present invention concerns a device having a slider equipped with a manual control piece which is fixed in position in a guidetrack. 
     BACKGROUND OF THE INVENTION 
     Frequently, the relative position of two elements which function together mechanically must be adjusted and fixed in the desired setting, as determined by the conditions in which they will be used. This is particularly true for some ski boots, one or several of whose mechanical operating characteristics may be adapted according to intended use and to the conditions under which the boots will be used. Although the in no way limited to this kind of specific usage, the invention will be described with reference to this particular technical area, and adaptation of the invention to other uses may be accomplished mutatis mutandis by those skilled in the art. 
     Modern ski boots are usually equipped with devices which permit adjustment of the relative positions of two of their component elements: one of these elements contains a guidetrack or slide in which a device or slider, which forms one piece with the second element, or itself constitutes that element, may be adjusted into position. This may, for example, be the arrangement used for adjusting the forward positioning or the lateral inclination of a boot shaft jointed to a rigid shell base, or for adjusting the forward or rearward flexion characteristics of this shaft in relation to the shell base. 
     Thus, French Patent Application No. FR 2 480 575 describes a device in which a guidetrack incorporates on each side a system of notches which cooperates with a pawl system carried by the slider which is spring-activated, so as to fix the relative positions of the slider and the slide-track. Although the fixing of position thus obtained is satisfactory in most cases of use, the boot is not definitively locked in that position, and an untimely shock exerted in the direction of the guidetrack is liable to change the adjustment position if the threshold for activation of the spring is exceeded. 
     SUMMARY OF THE INVENTION 
     By locking the device definitively into position, the skier may avoid such annoyances, thus demonstrating the invention&#39;s usefulness. This is the objective that the present invention proposes to achieve. 
     Although not limited to ski boots, the invention is described in the following text with reference to the adjustment of the angle of forward positioning of the shaft of a boot opening toward the front, this shaft being jointed onto an inflexible shell base, and with reference to the adjustment of the forward-flexion stiffness of the shaft of a rear entry. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will now be described with reference to the accompanying drawings, wherein several embodiments are shown for purposes of illustration, and wherein: 
     FIG. 1 shows in perspective a front entry boot in which the invention is applied according to the first embodiment described above; 
     FIG. 2 shows in perspective a rear entry boot illustrating the application of the invention according to the second embodiment described above; 
     FIG. 3 shows a detail of a longitudinal, vertical partial section of FIG. 1; 
     FIGS. 4A and 4B represent, in longitudinal section in relation to the guide-track (plane B--B in FIG. 4B) and in section along plane A--A in FIG. 4A respectively, an embodiment of a device according to the invention in the locked position; 
     FIGS. 4C and 4D correspond to FIGS. 4A and 4B, respectively, and show the device in open position ready for adjustment; and 
     FIGS. 5A to 5D, corresponding to FIGS. 4A to 4D, show a second embodiment of a device according to the invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The ski boot shown in FIG. 1 comprises, in a well-known arrangement, a rigid shell base onto which is hinged, at least partially around a transverse axis, a shaft comprising a rear cover 3 and a sleeve 4. The sleeve 4 opens toward the front in relation to the rear cover, allowing the entry of the skier&#39;s foot, and closes over the lower leg, using closing devices 5. This boot is equipped with a device 6 according to the invention which regulates the forward movement or the angle of forward inclination in relation to the vertical of the shaft 3, 4. This regulation is achieved by adjusting the relative positions of the shell base and of the rear cover 3 which is jointed around the axis 2. 
     To accomplish this adjustment, as illustrated in FIGS. 1, 3, and 4A to 4D, a guidetrack 7, whose axis lies in a substantially vertical plane, is cut into the rear cover 3. A slider 8, forming one piece with the shell base by any appropriate means, may be moved along the guidetrack, which thus causes the rear cover 3 to pivot about the transverse axis 2; the slider may also be locked into position. 
     The slider 8 comprises a body 81 comprising two flexible arms 82, 83 approximately parallel to the axis of the guidetrack 7, whose outer edges cooperate with the edges 72, 73 of the guidetrack 7 by coming into lateral contact with these edges. The body 81 has mounted on it a control lever 9 which is pivotable around an axis 91 parallel to the general plane of the guidetrack 7 and perpendicular to its general direction. In the area of the axis 91, the lever 9 is formed in a conventional manner, so as to obtain a toggle-lever effect providing two stable positions, locked (FIGS. 4A and 4B) and unlocked (FIGS. 4C and 4D). 
     On the surface facing the guidetrack 7, the lever 9 has a projection 92 whose width matches the gap separating the internal edges of the two flexible arms 82, 83. In the locked position, this projection 92 holds the two arms 82, 83 in contact against the inner edges 72, 73 of the guidetrack 7, in order to ensure the positive immobilization of the slider in relation to the guidetrack 7. The projection 92 may have an advancing profile which facilitates its positioning between the arms 82, 83 and the exertion of pressure which increases until the final locking position is achieved. 
     The outer edges of the flexible arms 82, 83 may be flat, as are the inner edges 72, 73 of the guidetrack 7. In this case, the pressure of the contact in the locked position must be sufficient to ensure immobilization of the device. It will, however, be understood that the coefficients of friction, like wear and tear over time, may cause problems. An advantage will thus be gained by providing, on at least one of the arms 82, 83 and on the corresponding inner edge 72, 73 of the guidetrack, non-flat complementary forms which fit together in interlocking fashion at the moment when locking occurs. FIGS. 4A through 4D thus show a device having uniform notches 10 in the form of serrations which mesh perfectly with the locking mechanism and also form adjustment steps. 
     Another proposed arrangement is shown in FIGS. 5A to 5D, according to which longitudinally spaced grooves 11 are cut in the inner flat edges 72, 73 of the guidetrack in which grooves fits a projection 12 of corresponding shape on the outer surface of the flexible arms 82, 83. During adjustment, the slider moves more easily in the guidetrack as it encounters resistance at each position of adjustment; since the user senses this resistance, the adjustment of position before locking of the mechanism is made easier. 
     Other complementary shapes may obviously be considered according to this principle. 
     Everything that has been said concerning the device for adjustment of the relative position of the two devices with reference to the embodiment shown in FIG. 1, is, mutatis mutandis, valid for the implementation shown in FIG. 2, with the exception of a few details: 
     In this case, the invention applies to a rear-entry boot. This time, it is the rear cover 3 which opens to receive the foot and which closes over the sleeve 4 jointed at 2 onto the shell base 1. The forward-flexion stiffness of the sleeve 4 is adjusted using a device having a slider 6, according to the principle enunciated, for example, in French Patent Application No. FR 2 480 575 already mentioned. In FIG. 2, the slider 8 acts as a stop for the transmission of the force of flexion between the sleeve 4 and a flexion plate 41 which may be unitary with the sleeve 4. The guidetrack 7 previously described matches the space separating the sleeve itself 4 from the flexion plate 41. Adjustment of stiffness is accomplished by varying the position of the slider 8 (which, in this case, is not unitary with any other part of the boot) along the guidetrack. 
     From the preceding description, the skilled workman may conclude that, by simple transposition, other uses and embodiments of the device may be considered, as they relate both to ski boots and to other technical applications.