Patent Application
20110258882
The present invention relates to a removable walking attachment for ski boots for improving traction and mobility comfort.
Ski boots are constructed to have a rigid (inflexible) outer (bottom) sole. That makes walking on the boots difficult and dangerous, as the wearer must walk flat-footed, i.e., a so-called duck-walk. Ski boot wearers tend to walk with their legs splayed outwardly in order to gain more stability. Removable attachments for ski boots have been proposed for the purpose of facilitating walking in the boots and/or improving traction. However, room for improvement remains.
A removable walking attachment for a ski boot comprises a one-piece body formed of an elastomeric material and defining a toe pad, a heel pad disposed rearwardly of the toe pad, and a flexible connector interconnecting the toe pad and the heel pad for permitting relative movement therebetween. The toe pad includes a toe base and an upright wall, the wall forming a rearwardly open cavity configured to receive a toe portion of a ski boot and including a rearwardly projecting lip disposed at an upper end of the cavity and adapted to overlie and engage a lower front rim of a ski boot when the attachment is worn. The toe base includes a toe underside and an upwardly facing toe support surface, wherein the toe underside, when lying flat on a planar surface, defines a plane. The heel pad includes a heel base and an upright wall, the wall of the heel base forming a forwardly open cavity configured to receive a heel portion of a ski boot and including a forwardly projecting lip disposed at an upper end of the forwardly open cavity and adapted to overlie and engage a lower rear rim of a ski boot when the attachment is worn. The heel base includes a heel underside and an upwardly facing heel support surface, wherein the heel underside, when lying flat on a planar surface, lies in said plane. The respective configurations of the toe and heel support surfaces are such as to cause the underside of the toe pad to become inclined forwardly/upwardly relative to said plane, and the heel pad to be inclined rearwardly/upwardly relative to said plane, when the attachment is worn on a ski boot.
a-5c are perspective views of a ski boot showing a sequence of steps for applying one of the removable attachments to a ski boot.
Depicted in the figures is an improved removable walking attachment for ski boots which provides a more natural walking motion and greater traction in ice and snow. A pair of the attachments 10, 10A would be available in various sizes to fit different sizes of ski boots.
The attachments 10, 10A are essentially identical, except for a slight difference adapting one attachment to be worn of the left ski boot and the other on the right ski boot. Thus, only one attachment 10 will be described in detail herein. That attachment 10 comprises a one-piece body formed of an elastomeric material such as natural rubber or thermoplastic urethane rubber (TPU rubber) for example. By “one-piece” is meant that the below-described toe pad, heel pad and connector of the body are formed simultaneously of the same material, e.g., by molding, in contrast to being formed of separate pieces that are then bonded to one another. Optional toe and heel wear pieces 14, 16 can be bonded to the body as will be later explained.
The one-piece body includes a toe pad 18, a heel pad 20, and a connector 22 interconnecting a rear side of the toe pad to the front side of the heel pad. The horizontal width of the connector preferably narrows at its midpoint to a width W which is shorter than the width of each of the toe and heel pads (
The toe pad 18 includes a toe base 24 and an upright wall structure 26. The toe base 24 includes an underside having a suitable traction pattern thereon, such as spaced apart projections 25 (see
The wall structure is shown as solid, but it could instead be somewhat skeletal. The toe wall structure 26 forms a toe cavity which is open in a rearward direction and configured to receive a toe portion of a ski boot SB. An upper edge of the front portion 28 includes a rearwardly extending lip 34 adapted to overlie and engage the standard lower front rim R of a ski boot to secure the toe pad to the ski boot (see
The toe base 24 includes an upwardly facing toe support surface 35 adapted to support the toe portion of a ski boot. The toe support surface 35 includes front portion 36 and a rear portion 38. The front portion 36 is in the form of a surface which defines a floor of the toe cavity. The vertical thickness of the toe base is not uniform in the fore-aft direction thereof. Rather, the thickness is greater adjacent the rear portion 38 of the toe support surface 35 than adjacent the front portion 36 thereof and progressively decreases from the rear to the front. Thus, when the attachment is not being worn and is seated flat against a planar surface, as shown in
The vertical distance between the front portion 36 of the toe support surface to the underside of the lip 34 corresponds substantially to the standard vertical thickness of the lower front rim R of a ski boot (see
The heel pad 20 includes a heel base 54 and an upright wall structure 56. The heel base 54 includes an underside having a suitable traction pattern thereon, such as spaced apart projections 55 (
The heel base 54 includes an upwardly facing heel support surface 65 adapted to support the heel portion of a ski boot. The heel base 54 includes a rear portion 66 and a front portion 68. The rear portion 66 is in the form of a surface which defines a floor of the heel cavity. The vertical thickness of the heel base is not uniform in the fore-aft direction thereof. Rather, the thickness is greater adjacent the front portion of the heel support surface than adjacent the rear portion thereof and progressively decreases from the front to the rear. Thus, when the attachment is not being worn and is seated flat against a planar surface, as shown in
The vertical distance between the rear portion 66 of the heel support surface to the underside of the lip 64 corresponds substantially to the standard vertical thickness T′ of the lower rear rim R′ of a ski boot (
When the wearer then stands on a surface, the flat underside of the boot comes to rest on the rear portion 38 of the toe pad and the front portion 68 of the heel pad. Due to the difference between the distances D and d, and between the distances D′ and d′, the front end of the toe pad 18 and the rear end of the heel pad 20 are caused to be flexed upwardly. That results in the underside of the toe pad becoming inclined forwardly/upwardly at a slight angle A, e.g., of about 10 degrees, relative to the plane 29 and the heel pad becoming inclined rearwardly/upwardly at a slight angle B, e.g., of about 10 degrees, relative to the plane 29 (see
As the skier walks while wearing the attachments, a more natural walking motion is possible, due to the inclinations of the undersides of the toe and heel pads. That is, as one foot of the wearer pushes off a surface along the toe pad 18, a more natural rolling motion is achieved by the forwardly/upwardly inclined underside of that toe pad. Likewise, as the wearer lands on the heel pad 20 of the other foot, a more natural rolling motion is achieved due to the forward/downward inclination of the underside of the heel pad 20.
The gap between the underside of the toe pad and the underside of the heel pad, i.e., the region beneath the connector 22, is situated beneath the wearer's arch and thus permits this natural motion to occur. That is in contrast to previously proposed ski boot attachments in which the entire bottom surface of the attachment is convexly curved from front to back, such that the thickest part of the underside lies beneath the wearer's arch, causing an unnatural up/down movement as the wearer walks.
The respective vertical thicknesses of the toe pad 18 and the heel pad 20 should be large enough to enable the undersides of the toe and heel pads to be inclined sufficiently to achieve the more natural walking motion. If the pads 18, 20 are too thin, their undersides cannot be so inclined without making the pads too fragile and susceptible to abrasive wear. Preferably, the thickest part of each of the toe and heel pads, i.e., at the rear portion 38 of the toe pad and the front portion 68 of the heel pad, should be at least ½ inch, more preferably at least ¾ inches. The difference between the distances D and d, and between the distances D′ and d′ should be at least ⅜ inch, more preferably at least ⅝ inches; that is also true of the difference between the distances D′ and d′.
Since abrasive wear of the toe and heel pads is most prevalent at the front lower edge of the toe pad and the lower rear edge of the heel pad, it is preferable to embed the wear pieces 14 and 16 in those edges. Each wear piece 14, 16 extends laterally across the respective pad 18 or 20 and is formed of a stiff material, e.g., of plastic such as urethane and includes projections 14a, 16a whose bottom tips lie in the plane 29 when the attachment is not worn and lays flat against a surface.
It will be appreciated that the embodiment described above is only a preferred embodiment, and that additions, deletions, modifications, and substitutions not specifically described may be made without departing from the spirit and scope of the appended claims.
