Abstract:
A heel holder including a base plate on which is arranged a bearing block which can be pivoted laterally. A swivel head is supported in the bearing block on a transverse axle. Between the base plate and the bearing block there is provided a return spring. A locking mechanism is provided in addition, which locking mechanism holds the bearing block in its centered position. In order to hold the bearing block in the heel holder with pressure, the invention provides that the base plate carries a rectangular projection on its upper side, with which projection is associated a recess in the base of the bearing block, and that above the projection there is arranged the locking mechanism which acts through a frictional connection.

Description:
FIELD OF THE INVENTION 
     The invention relates to a heel holder for use on a ski binding adapted to be mounted on a ski. 
     BACKGROUND OF THE INVENTION 
     Such a heel holder is for example described in AT-B-383 498. The return of the bearing block into its center position relative to the base plate is in this heel holder accomplished by a torsion spring, the two legs of which each have one bent end area extending in direction toward the upper side of the ski. The two end areas are received in a recess constructed at the rear end of the base plate. 
     In a simple design of this heel holder, a locking of the heel holder in the center position of the bearing block is done by a resilient tongue, which is forked at its end and which is arranged in the base of the bearing block, is controlled by the locking rocker arm and is supported in the locked position on a projection of the base plate. In order to prevent with this tongue, during stepping in, a lateral swinging out of the bearing block even during a constant lateral load, this design, however, demands high manufacturing exactness since the position, in which the locking rocker arm grips under the locking nose, must coincide exactly with the position in which the tongue leaves the projection. 
     In other designs of such a heel holder (see FIGS. 7-15 and AT-B-386 749), the disclosed disadvantage does not occur, however, these designs are slightly complicated in their construction due to the leverlike locking element, which is under the action of a spring and which is pivotally supported in the bearing block. Furthermore, the heel holder can in both cases be pivoted only when the sole down-holding means is open. Furthermore, the bringing into existence of the diagonal control is complicated in this heel holder because an upward pivoting of the sole down-holding means, which pivoting is too intensive, leads immediately to the locking of the resilient tongue and thus stops a lateral swinging out of the heel holder. This is the result of designing the locking mechanism with forced locking. 
     A further heel holder is shown in AT-B-380 174. This heel holder belongs to a different class than the subject matter of the invention because an additional elastic locking mechanism, which holds the bearing block in its center position when the ski boot steps in, is missing here. 
     The heel holder described in the DE-A-22 00 768 differs also with respect to its class from the subject matter of the invention. Thus, the heel holder does not have a swivel head, but a housing-like heel-holding member. A stepping spur does not exist. The sole down-holding means is rotated around a vertical screw bolt during a twisting fall. A stop loaded by the release spring and secured on the sole down-holding means is thereby pivoted, which stop is supported on a counter-stop of a carriage carrying the heel holder. An additional elastic locking mechanism is also missing in this design. 
     SUMMARY OF THE INVENTION 
     The purpose of the invention is to avoid the disadvantages of the known designs and to provide a heel holder, the mounting of which in the centered position (downhill skiing position or stepping-in position) is done by means of a pressure locking mechanism. 
     In contrast to the known locking mechanisms, which operate with a forced locking, the controlled diagonal release of a heel holder equipped with a locking mechanism of the invention can also be carried out by untrained persons. Regardless of this, this locking mechanism guarantees a centered position of the heel holder for the stepping in also on difficult terrain. 
     The stiffness of the insert is increased by the inventive features of this invention so that the insert can be manufactured of a thinner material. 
     The leaf spring feature for the elastic locking mechanism makes the manufacture of the locking mechanism out of a band material and its anchoring on the insert easier. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Exemplary embodiments of the subject matter of the invention are illustrated in the drawings, in which: 
     FIG. 1 is a vertical longitudinal center cross-sectional view of a first heel holder of the invention in the skiing position; 
     FIG. 2 is a cross-sectional view taken along the line II--II of FIG. 1 of a detail of the heel holder; 
     FIG. 2a illustrates the same detail in the swung-out position of the heel holder; 
     FIG. 2b shows a modification of the embodiment according to FIGS. 1 and 2; and 
     FIGS. 3 to 13 are cross-sectional views of modifications of the embodiment according to FIGS. 1 and 2. 
    
    
     DETAILED DESCRIPTION 
     The heel holder according to FIG. 1 is identified in its entirety by the reference numeral 1. The heel holder is movably guided on a rail 2 which is fastened on the upper side of a ski 2a by means of screws (not illustrated), and can be locked by means of a detent 3 which is received in at least one recess of the rail 2. The heel holder 1 can in this manner be adjusted to various boot sizes. 
     The heel holder 1 consists of a base plate 4 mounted to slide along the rail 2. The heel holder has an axle 5 thereon which is perpendicular with respect to the base plate 4. A bearing block 6 is pivotally supported on the axle and is urged into a centered position by a torsion spring 5a. The base plate 4 has an upwardly directed projection 4a, with which is associated a recess 6a in the base 6b of the bearing block 6. 
     The upwardly facing side of the base plate 4 defines with its downwardly facing side a rearwardly opening acute angle α. This inclined position of the heel holder 1 balances the embossing on the ski existing in the binding area such that the inserted ski boot lies with its sole substantially in a plane parallel to the running surface of the ski. 
     A binding housing 7 is fastened on the bearing block 6. The binding housing 7 carries at its front end on a transversely extending axle 8 a swivel head 9 having sole down-holding means 9a and a stepping spur 9b thereon. A roller 11 is supported in the spur 96, which roller rests on a control cam 4b on the base plate 4. A locking rocker arm 13 is supported in the bearing block 6 on a further transversely extending axle 12, which locking rocker arm 13 rests on a control cam surface 9c arranged on the inside of the swivel head 9. The locking rocker arm 13 is loaded by a piston 14 urged by two coaxial pressure springs 15, 16 supported in the binding housing 7, the initial tension of which pressure springs can be adjusted by means of an adjusting screw 17. A plate-shaped insert 18 of plastic is fastened on the inside of the bearing block 6, which insert extends parallel with respect to the base 6b of the bearing block. The insert 18 has in the area of its longitudinal sides downwardly projecting edges 18a 1 , 18a 2 . A leaf spring 19 acting as a detent is arranged between the insert 18 and the projection 4a of the base plate 4, which projection is rectangular in cross section. 
     A hand lever 10, which is only partially illustrated, is mounted in a conventional manner on a cross-bolt 13a of the locking rocker arm 13 to facilitate a voluntary opening of the heel holder 1. 
     The leaf spring 19 is--viewed in longitudinal direction--approximately W-shaped according to FIG. 2. It has a horizontal center part 19a, two downwardly bent legs 19b 1 , 19b 2  contiguous with the center part, and two further upwardly bent legs 19c 1 , 19c 2  contiguous with the legs 19b 1 , 19b 2 . The ends of the legs 19c 1 , 19c 2  are again bent at 19d 1 , 19d 2  and rest on the undersides and on the side surfaces of the two edges 18a 1 , 18a 2 . 
     The leaf spring 19 is in the skiing position in the position illustrated in FIG. 2. If the bearing block 6 is, however, pivoted relative to the base plate 4 (see FIG. 2a), then the one lower side of the leaf spring 19 is pressed upwardly, for which first a relatively large force is needed, which, however, decreases as soon as the pressed-back lower side rests on the upper side of the projection 4a of the base plate 4. The bearing block 6 is pivoted from this time on only yet against the friction force occurring between the leaf spring 19 and the base plate 4 or rather its projection 4a. 
     The modified embodiment according to FIG. 2b differs from the one first described in that a bearing block 6&#39;, which is supported pivotally on a vertical axle of the base plate 4&#39;, is constructed relatively flat and has two shoulders at its rear end, with which shoulders it is received in recesses in the crosswall of a housing 21, which for strength reasons is preferably manufactured of aluminum. 
     The bearing block 6&#39; has two bearing holes at its front end aligned in an assembled state with two bearing holes of the housing 21. A bolt extends through both sets of bearing holes. The housing 21 has in the place of a platelike insert of plastic a crossbar 18&#39; constructed in one piece with the housing 21. The crossbar 18&#39; serves to support a leaf spring 19&#39;, which corresponds with the leaf spring of the first exemplary embodiment. 
     The leaf spring 119 illustrated in FIG. 3 is similar to the one first described. It differs from the first embodiment only in the ends of the legs 119c 1 , 119c 2  being bent inwardly at an obtuse angle and resting on the inner sides of the two edges 118a 1 , 118a 2  of the insert 118, corresponding to the insert 18 in FIGS. 1 and 2. 
     The legs 218c 1 , 219c 2  are in the case of the leaf spring 219 according to FIG. 4 bent outwardly at their ends 219d 1 , 219d 2  and are received in the recessed borders between the edges 218a 1 , 218a 2  and the insert 218, corresponding to the insert 18 in FIGS. 1 and 2. 
     The design of a leaf spring 319 illustrated in FIG. 5 is similar to the one described first with the only difference being that the ends 319d 1 , 319d 2  of the two legs 319c 1 , 319c 2  rest on the undersides and on the inner sides of the two edges 318a 1 , 318a 2  of the insert 318, corresponding to the insert 18 in FIGS. 1 and 2. 
     The leaf spring 419 rests in contrast to this, according to FIG. 6, with the ends of its outer legs 419c 1 , 419c 2  only on the inner sides of the two edges 418a 1 , 418a 2  of the insert 418, corresponding to the insert 18 in FIGS. 1 and 2. 
     The embodiments according to FIGS. 7 to 9 differ from the ones described so far in that the projection 504a to 804a of the base plate 504 to 804, respectively, has on its upper side a rib 504b to 804b which is triangular in cross section and extends in longitudinal direction of the ski, which rib is received in the skiing position of the heel holder a corresponding notch of the leaf spring 519 to 819. The ends of the legs 519c 1 , 519c 2  to 819c 1 , 819c 2  are fastened in the same manner as has already been described in connection with FIGS. 2, 5, 6 and 7. However, the spring 819 according to FIG. 10 is U-shaped with the two legs 819e 1 , 819e 2  each being provided with one outwardly directed step. The stiffness of the spring is reduced with the step. 
     The embodiment of a leaf spring 919 illustrated in FIG. 11 is distinguished by storing a cushion 920 made of a viscous or rubber-elastic material in a cavity located between the leaf spring 919 and the insert 918, which facilitates a thinner design of the leaf spring 919. The ends of the outer legs 919c 1 , 919c 2  rest here on the inner sides of the two edges 918a 1 , 918a 2  of the insert 918. 
     Also in the embodiment of a leaf spring 1019 according to FIG. 12, a cushion 1020 of rubber is arranged above the spring, which cushion is supported on the insert 1018. However, the leaf spring 1019 is in contrast to the preceding exemplary embodiment not fastened with the upper ends of its legs 1019c 1 , 1019c 2  to the insert 1018, but instead the ends 1019d 1 , 1019d 2  of the legs 1019c 1 , 1019c 2  are bent outwardly and rest on the edge of a recess in the base 1006b of the bearing block 1006. 
     The embodiment according to FIG. 13 is distinguished by the base plate 4&#34; in this embodiment having a recess 4&#34;c extending in longitudinal direction of the base plate and being rectangular in the top view and in cross section, into which recess is inserted a cushion 20&#34; made of a rubber-elastic material. The cushion 20&#34; is covered by a leaf spring 19&#34; at its upper side, which leaf spring has a trapezoidal cross section in its center area. The cushion 20&#34; of a rubber-elastic material and the leaf spring 19&#34; form in this embodiment together a self-contained elastic locking mechanism. The bearing block 6&#34; has a plate-shaped insert 18&#34; made of plastic with a downwardly directed projection 18&#34;a extending in longitudinal direction of the bearing block 6&#34; and being rectangular in cross section. The projection 18&#34;a is associated with the cushion 20&#34; in the recess 4&#34;c in the base plate 4&#34; or rather the leaf spring 19&#34;. The projection 18&#34;a of the insert 18&#34; is received, in the center position of the bearing block 6&#34;, in the center area of the leaf spring 19&#34;, which area has the aforementioned trapezoidal cross section. 
     The invention is not to be limited to the exemplary embodiments illustrated in the drawings and described above. Rather various modifications of the same are possible without departing from the scope of the invention. For example, it would be possible to manufacture the housing 21 of a suitable plastic instead of aluminum.