Patent Document

BACKGROUND OF THE INVENTION 
     This is a continuation of application Ser. No. 08/303,988 filed on Sep. 9, 1994, now abandoned. 
    
    
     This invention relates to an article of sport footwear, in particular to a ski boot, a skating boot, or the like, having a shell with a main longitudinal spread and formed with two longitudinally opposite, respectively forward and rearward, openings being so located on said shell as to respectively allow the skier&#39;s leg to lean forwards and rearwards, said openings extending from a shell entrance and defining two transversely opposite lateral sides on said shell, a bootleg pivoted on the shell and embracing said lateral sides at least partway, and a means on the shell of limiting the allowable bootleg rearward swing and/or limiting the allowable boot forward flex. 
     The bootlegs of ski boots of the above kind are usually arranged to return, from a normal skiing position where the skier&#39;s leg is imposed a slight forward bend, to a rest position which allows for increased stretching, and hence enhanced relaxation, of the leg muscles. The ability to switch to this position is specially appreciated while walking or during rest breaks. Also known is that such boots are provided with a means of adjusting the allowable forward flex of the leg, i.e. toward the toe of the boot, from the above-mentioned skiing position. 
     A boot type which incorporates both features is known, for example, from European Patent Application N° 93201691.8 by this Applicant. 
     That document discloses a boot having a bootleg which is pivoted by means of pins to the shell and secured to the shell through a knob affording three position settings, namely: a setting where the bootleg is locked relative to the shell for the skiing position, a setting where a rearward swing is allowed from the skiing position toward a rest position, and a setting where a forward swing is allowed from the skiing position toward a more forward-leaning position. 
     While that boot is technically satisfactory, and its adjustable feature beneficial, it still has a drawback in that it affords no freedom of adjustment for the stop positions to the forward or rearward swings of the bootleg, except as allowed for by the knob control. In addition, due to the relative proximity of the elements attaching the shell to the bootleg and providing such limitations and the pins whereby the bootleg is pivotably connected to the shell, a comparatively large stress is imposed on such attachment elements and the shell, for a given resisting torque provided to limit said swing movements. 
     Also, the imposable limitations, but for the locked shell/bootleg position, are only applied to one of the two (forward flex/rearward flex) possible movements, which restricts the range of adjustment for such movements. 
     The underlying technical problem of this invention is to provide an article of sport footwear, such as a ski boot, whose construction and performance are effective to obviate the drawbacks with which the cited prior art is beset. 
     SUMMARY OF THE INVENTION 
     This problem is solved by the invention through an article of sport footwear of the kind outlined in the introduction and characterized in that said means comprises at least one fastening device which extends between said lateral sides of the shell to bridge the corresponding opening, said fastening device comprising respective fastening elements attached to the corresponding lateral sides at a location close to said entrance and coupled adjustably together. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will now be described with reference to two preferred embodiments thereof illustrated, by way of example and not of limitation, by the accompanying drawings, in which: 
     FIG. 1 is a side elevation view of a ski boot according to the invention as set for a skiing position; 
     FIG. 2 is a side elevation view of the same boot in the rest position thereof; 
     FIGS. 3 and 4 are enlarged detail elevation views of the boot in FIG. 1, respectively as viewed from one side and the rear; 
     FIG. 5 is a perspective view of the shell of the boot shown in the preceding figures; 
     FIG. 6 is a sectional view taken along line VI--VI in FIG. 3; and 
     FIG. 7 is a sectional view corresponding to FIG. 6, showing a modified embodiment of the invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In the drawing figures, generally shown at 1 is a ski boot including a shell 2, an inner shoe 3, and a bootleg 4. The shell and bootleg are preferably plastics mouldings. 
     The shell 2 (FIG. 5) has a sole 5 with oppositely located toe 6 and heel 7 ends which identify a longitudinal direction of the boot. Defined on the remote end from the sole 5, at the free end of the shell portion which encircles the skier&#39;s leg, is an entrance 8 whence two, respectively forward and rearward, openings 9, 10 extend. Such openings 9, 10, which in the example illustrated carry no flaps, although it should be understood that one or both of them may be of the overlapping flap type, serve the function of allowing a comparatively wide swing range for the inner shoe 3 and a tongue 3a associated with it in the longitudinal direction of the boot. Thus, they may be replaced within the scope of this invention with another means providing that swing range. In view of the supporting function served by the tongue and the inner shoe when the boot is flexed forwards, these are also referred to as forward boot supports in the claims. 
     Said openings 9, 10 define two lateral sides 11a,b on the shell; notice that such lateral sides span a considerable distance from the sole 5 for reasons to be explained. 
     The ends of the lateral sides 11a,b next to the entrance 8 are provided with respective holes 12a,b; holes 13a,b are correspondingly provided through the shell proximate to the sole 5 for the bootleg 4 articulation. This articulation is obtained using conventional means, such as rivets 13. 
     For closing and clamping the shell onto the user&#39;s foot, a lever fastening arrangement 14, known per se, is provided which acts on a cover 15 extending over the opening 9 on the back of the shell 2. 
     The bootleg 4 is preferably of the overlapping flap type having two fastening arrangements 16, 17, also conventional, whereby it can be clamped in an adjustable manner onto the shell and the inner shoe to gird the skier&#39;s leg with a desired tension force. Said bootleg 4 has a lug 18 rearwardly, also called &#34;spoiler&#34;, which provides hind support for the calf region of the skier&#39;s leg. Formed outwardly on said lug 18 is a seat 19 which extends circumferentially at the same level as the entrance 8. Notice that the top portions of the two lateral sides 11a,b project beyond the bootleg 4 on both sides of the lug 18. 
     On the top portion of the lateral side 11a, there is secured, as by means of a rivet or a stud 20 engaged in the hole 12a, the middle portion of a band-like flexible element 21 having, attached to its opposite end regions 21a,b, a pull-apart closure 22 of the kind known as &#34;VELCRO&#34;, a registered trademark. The application of that closure is such that both end regions of the element 21 can be closed on each other in an adjustable manner. 
     In a similar way to the lateral side 11a, to the middle of the top portion of the lateral side 11b there is attached, as by means of a rivet or stud 23 engaged in the hole 12b, a second band-like element 24 whose ends 24a,b carry a ring 25 through which the corresponding end portion 21a,b of the elements 21 is engaged in a releasable manner. The lateral sides 11a, 11b are substantially rigid in the longitudinal direction so as to resist a pull applied thereto by the fastening devices. 
     Thus, the corresponding end portions 21a, 24a and 21b, 24b, respectively, constitute fastening elements of respective band-like fastening devices which are tightened in a releasable and adjustable manner by means of their respective rings 25 and pull-apart closures to provide the following functions. 
     As for the band-like fastening device composed of the elements 21a, 24a, it is led along the seat 19 on the lug 18 such that it will bridge the opening 10 and function to limit the rearward swing of the bootleg 4 and the inner shoe 3. In essence, by lengthening the adjustment of that fastening device from the skiing position of FIG. 1 (or, in the extreme, by fully releasing the pull-apart closure), the bootleg is caused to straighten up toward the rest position of FIG. 2. Said device 21a, 24a, therefore, controls the free rearward swing of the bootleg and the inner shoe, which swing is, as previously mentioned, allowed for by the opening 10. Conversely, by shortening the adjustment of the fastening device 21a, 24a, the forward inclination of the bootleg 4 can be increased. 
     As for the band-like fastening device composed of the end elements 21b, 24b, it is led across the inner shoe 3 and the tongue 3a to bridge the forward opening 9, and functions to limit the forward flex of the boot 1. In essence, the shorter is the setting of the fastening device 21b, 24b, the stiffer becomes the boot, because the band-like device in question becomes a forward support for the skier&#39;s leg and is attached to the shell by means of the studs 20, 23. By converse, the longer is the setting of the device 21b, 24b, the more flexible becomes the boot in the forward direction. 
     Notice that both these adjustments are quite independent of the bootleg clamp-action adjustment performed by means of the lever fasteners 16, 17. Also notice that the tension transferred to the fastening devices 21a, 24a and 21b, 24b affords, by virtue of the considerable length of the lever arm from the pivot axis of the bootleg on the shell, the application of large resisting torques to the skier&#39;s leg. Additionally, all the stresses are transferred directly to the shell through the studs 20, 23. 
     In a modified embodiment shown in FIG. 7, where similar parts are denoted by the same reference numerals as in the previous embodiment, the two fastening devices located at the forward opening 9 and the rearward opening 10, respectively, are each comprised of a band-like flexible element 30a,b, one end whereof is attached, as by means of a rivet 31, to a corresponding lateral side 11a,b of the shell 2, the opposite end carrying a conventional lever fastener 32a,b whose ring 33a,b is engageable in an adjustable and releasable manner between teeth of a rack 34a,b which is attached to the opposite lateral side 11b and 11a, respectively, by means of the rivet 31 itself. It will be understood that the fastening devices in question may be any suitable arrangement known in the ski boot art. 
     Thus, the invention does solve the problem proposed with an advantageously simple, economical and versatile structure.

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