US20030189315A1

US20030189315A1 - Telemark binding assembly

Info

Publication number: US20030189315A1
Application number: US10/410,007
Authority: US
Inventors: Matthew Venable; Matthew Rollins
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-09
Filing date: 2003-04-09
Publication date: 2003-10-09

Abstract

A binding assembly is provided for an elongate ski. The binding assembly receives a boot having a toe portion and a heel portion. The assembly comprises a toe piece mountable to the ski for receiving at least a portion of the toe portion of the boot. A heel piece is spaced from the toe piece with the heel piece for receiving at least a portion of the heel portion of the boot. A spring mechanism connects the heel piece to the toe piece. A cam member is rotatably mounted to the heel piece and contactable with the heel portion of the boot with the cam member releasably retaining the boot within the heel piece wherein upon the heel portion contacting and rotating the cam member, the spring mechanism releasably secures the heel portion within the heel piece.

Description

The present application is a continuation and claims priority of pending provisional patent application Ser. No. 30/371,203, filed on Apr. 9, 2002, entitled “Telemark Binding”.[0001]

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates generally to a telemark binding assembly and, more particularly, it relates to a telemark binding assembly that combines the performance of a ski area binding with the functionality and lightweight of a backcountry binding.

2. Description of the Prior Art

Telemark skiing is an increasingly popular sport enjoyed by many persons. In telemark skiing, a skier wears ski boots which are attached to the telemark skis by ski bindings. Unlike downhill ski bindings, the telemark ski bindings do not hold the heels of the skier's boots fixed to the ski. Instead, telemark ski bindings actually permit the skier to lift his or her heel away from the ski while the toe remains attached to the ski.

In many instances, telemark ski bindings are typically reinforced versions of cross-country ski bindings. In most such bindings, the toe of a ski boot is connected to a ski by mating three holes on the underside of the toe to three corresponding pins on the binding. Such bindings are called “three-pin” bindings.

Telemark skiing requires a skier to carve an edge of the ski into the snow in order to maintain control. An ideal telemark ski binding system must provide good lateral stability. That is, while the binding system permits the skier's heel to move away from the ski, the binding system should not permit the skier's heel to move from side to side relative to the longitudinal centerline of the ski. While three-pin bindings, are generally effective, they typically allow more lateral play between the boot heel and the ski than is desirable for top performance. This adversely impacts skier control. A telemark ski boot-binding system should also provide good torsional rigidity.

Another problem with some telemark ski binding systems is that the ski heel is able to move undesirable freely toward and away from the ski. This is a problem because a ski is a long object which therefore possesses a large moment of inertia about a transverse axis. Thus a skier can have difficulty in controlling the position of the heel portion of the boot relative to the ski as is essential for maintaining control and effecting good telemark turns.

In an effort to remedy the foregoing inadequacies of telemark binding systems, binding manufacturers have added cables to the telemark bindings. Each of these bindings has a toe piece portion which receives a toe portion of a skier's boot and a cable attached to the toe piece portion. The cable wraps around the heel of a skier's boot and is secured to the binding on both sides of the toe portion of the boot. The cable typically includes one or more extension springs. The springs maintain the cable under tension so that the cable pulls the boot heel forward toward the toe piece ensuring that the toe portion remains snugly secured within the clamp(s).

In general, the cable has two main functions. First, it forces the toe of the boot firmly into the toe piece portion of the binding reducing lateral play between the boot and the ski. The forward force is greatest when the boot is in a “heel low” position, i.e., a substantially flat position on the ski. Second, when the skier's boot is in a “heel high” position, i.e., the boot heel is lifted substantially away from the ski, the cable applies a force to the heel which has a component that tends to pull the heel back toward the ski maintaining the heel and ski in a desired relationship during telemark turns.

Unfortunately, conventional telemark cable binding systems have several shortcomings. For example, it is typically impractical to make the cable tight enough to hold a ski boot firmly enough into a binding to eliminate lateral play. When the cable is made very tight it can exert enough force on the heel of the ski boot to overcome the stiffness of the toe of the boot and cause the toe portion of the boot to collapse onto the skier's foot. This very painful phenomenon is known commonly to skiers as “toe crunch” and can cause severe injury.

Another problem with conventional cable bindings is that the position along the ski at which the cable pivots as the heel is raised is spaced apart from the position where the sole of the boot bends. This relationship of pivot points can result in “tip dive”, which is a condition wherein the ski tip rotates precipitously downwardly into the snow. Tip dive generally unsettles the skier and is likely to cause the skier to fall.

The springs used in the conventional cable bindings also tend to break prematurely during normal use. Replacing broken springs introduces undesirable costs and down time. The cables, and their associated springs, also tend to cut, mar and/or otherwise damage both the ski boot about which they are wrapped, and the boot attached to the adjacent ski. Such damage can occur as a result of the springs scraping back and forth against the outer surfaces of the boots.

Accordingly, there remains a need for alternatives to conventional cross-country and telemark bindings.

SUMMARY

The present invention is a binding assembly for an elongate ski. The binding assembly receives a boot having a toe portion and a heel portion. The assembly comprises a toe piece mountable to the ski for receiving at least a portion of the toe portion of the boot. A heel piece is spaced from the toe piece with the heel piece for receiving at least a portion of the heel portion of the boot. A spring mechanism connects the heel piece to the toe piece. A cam member is rotatably mounted to the heel piece and contactable with the heel portion of the boot with the cam member releasably retaining the boot within the heel piece wherein upon the heel portion contacting and rotating the cam member, the spring mechanism releasably secures the heel portion within the heel piece.

The present invention further includes a method for mounting a boot within a binding system on a ski. The method comprises providing a toe piece, mounting the toe piece on the ski, providing a heel piece spaced from the toe piece, rotatably mounting a cam member to the heel piece, connecting the heel piece to the toe piece with spring means, inserting a toe portion of the boot into the toe piece, contacting the cam member with the heel portion of the boot, rotating the cam member with the heel portion of the boot until the heel portion of the boot is seated into the heel piece, and tensioning the spring means to releasably securely maintain the boot between the toe piece and the heel piece.

In addition, the present invention includes a binding system for skiing activities. The binding system comprises a toe piece mountable to the ski and a free heel piece spaced from the toe piece. A cam mechanism is rotatably mounted to the heel piece for releasably maintaining a boot within the heel piece. A mechanism connects the heel piece to the toe piece and tensioning the heel piece in a general direction toward the toe piece.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating the telemark binding assembly, constructed in accordance with the present invention; [0018]
FIG. 2 is a perspective view illustrating a heel piece of the telemark binding assembly of FIG. 1, constructed in accordance with the present invention; and [0019]
FIG. 3 is a perspective view illustrating a rotatable cam member of the telemark binding assembly of FIG. 1, constructed in accordance with the present invention.[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

As illustrated in FIG. 1, the present invention is a telemark binding assembly, indicated generally at [0021] 10, on a ski (not shown) for receiving a boot (not shown) for use in telemark skiing and other skiing activities. In sum, the telemark binding assembly 10 of the present invention features a simple, straightforward, step-in binding system allowing a skier to step into the telemark binding assembly 10 quickly without the difficulty of trying to slip a cable around the back of a ski boot as provided in conventional bindings.
The boot usable with the [0022] telemark binding assembly 10 of the present invention preferably has a flexible sole with a toe portion and a heel portion. The toe portion is generally near the front end of the boot and has lateral edges. The heel portion is generally near the rear end of the boot. It should be noted that the boot does not form a part of the present invention and any type of boot can be used with the telemark binding assembly 10 of the present invention.
As used herein, the “ski” includes, but is not limited to, any of a variety of telemark, cross-country or alpine skis. As used herein, the term “boot” or “ski boot” includes, but is not limited to, any of a variety of telemark, cross-country or alpine ski boots. Furthermore, as described above, the boots may be made of any suitable materials as are known to those skilled in the boot making arts. [0023]
The [0024] telemark binding assembly 10 of the present invention includes a secured toe piece 12, a free heel piece 14, a first spring member 16 and a second spring member 18 with the first spring member 16 and the second spring member 18 connecting the toe piece 12 to the heel piece 14. The toe piece 12 of the telemark binding assembly 10 is preferably securely mounted to the ski by screws set through the toe piece into the ski. Other means for connecting the toe piece 12 to the ski, including, but not limited to, adhesive, nuts and bolts, welding, etc., are also within the scope of the present invention.
The [0025] toe piece 12 of the telemark binding assembly 10 receives the toe portion of the boot. The toe piece 12 preferably provides a socket 20 which receives the toe portion of the boot and permits the toe portion to be withdrawn from the toe piece 12 in a generally rearward direction. When the toe portion of the boot is engaged in the toe piece 12, the toe piece 12 substantially inhibits the toe portion from moving transversely relative to the ski. The toe portion and the toe piece 12 mate, for example, in a manner similar to the mating of a toe portion of an alpine ski boot and the toe piece of an alpine ski binding, both of which are well known in the art.
The [0026] telemark binding assembly 10 of the present invention further includes the first spring member 16 having a first end 22 and a second end 24 and the second spring member 18 having a first end 26 and a second end 28. The first and second spring members 16, 18 extend in a generally rearward direction from the toe piece 12 with the first end 22 of the first spring member 16 and the first end 26 of the second spring member 18 pivotally secured to the toe piece 12. The second end 24 of the first spring member 16 and the second end 28 of the second spring member 18 are secured to the heel piece 14. The heel piece 14 is free from connection to the ski such that the heel piece 14 can move in a direction generally away from and toward the ski. In addition, the heel piece 14 is preferably sized and shaped to encompass at least a portion of the heel portion of the boot, as will be described in further detail below.
As illustrated in FIG. 2, the heel piece of the [0027] telemark binding assembly 10 includes a heel aperture 30 for receiving a pin 32. The use of the heel aperture 30 and the pin 32 will be described in further detail below.
In a preferred embodiment, the [0028] first spring member 16 and the second spring member 18 include a first rod 34 secured to the toe piece 12 and a second rod 36 secured to the heel piece 14. An encased spring (not shown) secures the first rod 34 to the second rod 36. Encasing the spring, as described, provides protection of the encased spring from the elements and adverse environmental conditions.
It should be noted that while in the preferred embodiment of the [0029] telemark binding assembly 10, the first spring member 16 and the second spring member 18 are aligned substantially along the outside of the boot, it is within the scope of the present invention to align the first spring member 16 and the second spring member 18 under the sole of the boot. In addition, other spring means are within the scope of the present invention to connect the toe piece 12 to the heel piece 14 of the telemark binding assembly 10 of the present invention.
Preferably, the [0030] toe piece 12 and/or the heel piece 14 are constructed from metal, such as stainless steel or aluminum. It is within the scope of the present invention, however, to construct the toe piece 12 and/or the heel piece 14 from other materials including, but not limited to, high impact plastic with or without metal inserts, ceramic, fiberglass, wood, etc. The material of the toe piece 12 and/or the heel piece 14 can be cast or injection molded depending on the desires of the manufacturer.
In addition, as illustrated in FIG. 3, the [0031] telemark binding assembly 10 of the present invention includes a rotatable cam member 38 mounted to the heel piece 14. The cam member 38 is preferably constructed from a high impact plastic with or without metal inserts in high stress areas, although constructing the cam member 38 from other materials are within the scope of the present invention.
The [0032] cam member 38 is preferably an elongated member having a cam aperture 40 for corresponding alignment with the heel aperture 30. The pin 32 is insertable and securable within the heel aperture 30 and the cam aperture 40 to allow rotation of the cam member 38 about the pin 32 relative to the heel piece 14.
The [0033] cam member 38 additional includes a heel receiving slot 42 formed therein. The heel receiving slot 42 is sized and shaped for receiving at least a portion of the heel portion of the boot when the skier inserts his or her boot into the telemark binding assembly 10. Actual use of the telemark binding assembly 10 of the present invention will be described in further detail below.
As illustrated in FIGS. [0034] 1-3, the cam member 38 has a biasing member (not shown) such as a spring or the like for biasing the cam member 38 in an unloaded, first position. After the skier has inserted the toe portion of the boot into the toe piece 12 of the telemark binding assembly 10, the heel portion of the boot moves in a generally downward direction into the heel receiving slot 42 of the rotatable cam 38. As the rotatable cam 38 rotates, the heel piece 14 of the telemark binding assembly 10 slides in a generally backward direction with the first spring member 16 and the second spring member 18 applying tension between the toe piece 12 and the heel piece 14. As the skier continues to move the boot downward, the rotatable cam 38 rotates until the boot's heel portion is received within the heel piece 14 and the rotatable cam 38 is releasably secured within a loaded, second position. With the action of the spring members 16, 18 and the cam member 38, the skier is then “locked” into the telemark binding assembly 10 and ready to ski. The skier can be released from the telemark binding assembly 10 by simply urging the cam member 38 in an opposite direction toward the unloaded, first position such as with a ski pole or the like.
The [0035] telemark binding assembly 10 of the present invention allows two points where force can be applied to the skier' boot. Since conventional bindings only secure the boot to the ski at the toe portion, there is only one point where force can be applied to the ski. Through an interaction between the heel piece 14 and a shim mounted to the ski under the heel piece 14, the telemark binding assembly 10 allows two points where force can be applied allowing the skier to make more precise turns.
The [0036] telemark binding assembly 10 of the present invention is both unique and innovative. The telemark binding assembly 10 combines the performance of a ski area binding with the lightweight and functionality required for the backcountry. The telemark binding assembly 10 of the present invention is much more convenient to use than traditional bindings with its one-of-a-kind step-in system. It also outperforms traditional bindings by providing an additional point to apply a force to the ski.
The foregoing exemplary descriptions and the illustrative preferred embodiments of the present invention have been explained in the drawings and described in detail, with varying modifications and alternative embodiments being taught. While the invention has been so shown, described and illustrated, it should be understood by those skilled in the art that equivalent changes in form and detail may be made therein without departing from the true spirit and scope of the invention, and that the scope of the present invention is to be limited only to the claims except as precluded by the prior art. Moreover, the invention as disclosed herein, may be suitably practiced in the absence of the specific elements which are disclosed herein. [0037]

Claims

What is claimed is:

1. A binding assembly for an elongate ski, the binding assembly receiving a boot having a toe portion and a heel portion, the assembly comprising:

a toe piece mountable to the ski for receiving at least a portion of the toe portion of the boot;

a heel piece spaced from the toe piece, the heel piece for receiving at least a portion of the heel portion of the boot;

spring means for connecting the heel piece to the toe piece; and

a cam member rotatably mounted to the heel piece and contactable with the heel portion of the boot, the cam member releasably maintaining the boot within the heel piece;

wherein upon the heel portion contacting and rotating the cam member, the spring means releasably secures the heel portion within the heel piece.

2. The binding assembly of claim 1 wherein the toe piece inhibits the toe portion from moving transversely relative to the ski.

3. The binding assembly of claim 1 wherein the spring means includes a first spring member having a first end and a second end and a second spring member having a first end and a second end.

4. The binding assembly of claim 3 wherein the first end of the first spring member and the first end of the second spring member are pivotally secured to the toe piece.

5. The binding assembly of claim 3 wherein the second end of the first spring member and the second end of the second spring member are attached to the heel piece.

6. The binding assembly of claim 3 wherein the first spring member and the second spring member include a first rod secured to the toe piece and a second rod secured to the heel piece, and further includes an encased spring securing the first rod to the second rod.

7. The binding assembly of claim 1 wherein the heel piece includes a heel aperture and the cam member includes a cam aperture alignable with the heel aperture, and further comprising:

a pin receivable within the heel aperture and the cam aperture allowing rotation of the cam member about the pin relative to the heel piece.

8. The binding assembly of claim 1 wherein the cam member includes a heel receiving slot sized and shaped for receiving at least a portion of the heel portion of the boot upon insertion of the heel portion of the boot.

9. The binding assembly of claim 1, and further comprising:

biasing means for biasing the cam member in an unloaded, first position.

10. A method for mounting a boot within a binding system on a ski, the method comprising:

providing a toe piece;

mounting the toe piece on the ski;

providing a heel piece spaced from the toe piece;

rotatably mounting a cam member to the heel piece;

connecting the heel piece to the toe piece with spring means;

inserting a toe portion of the boot into the toe piece;

contacting the cam member with the heel portion of the boot;

rotating the cam member with the heel portion of the boot until the heel portion of the boot is seated into the heel piece; and

tensioning the spring means to releasably securely maintain the boot between the toe piece and the heel piece.

11. The method of claim 10 wherein the spring means includes a first spring member having a first end and a second end and a second spring member having a first end and a second end, and further comprising:

pivotally connecting the first end of the first spring member and the first end of the second spring member to the toe piece; and

attaching the second end of the first spring member and the second end of the second spring member to the heel piece.

12. The method of claim 11 wherein the first spring member and the second spring member further comprise:

a first rod secured to the toe piece;

a second rod secured to the heel piece; and

an encased spring securing the first rod to the second rod.

13. The method of claim 10, and further comprising:

forming a heel aperture in the heel piece;

forming a cam aperture in the cam member

aligning the heel aperture with the cam aperture;

inserting a pin within the heel aperture and the cam aperture thereby allowing rotation of the cam member about the pin relative to the heel piece.

14. The method of claim 10, and further comprising:

forming a heel receiving slot in the cam member, the heel receiving slot sized and shaped for receiving at least a portion of the heel portion of the boot upon insertion of the heel portion of the boot.

15. The method of claim 10, and further comprising:

biasing the cam member in an unloaded, first position.

16. A binding system for skiing activities, the binding system comprising:

a toe piece mountable to the ski;

a free heel piece spaced from the toe piece;

cam means rotatably mounted to the heel piece for releasably maintaining a boot within the heel piece;

means for connecting the heel piece to the toe piece and tensioning the heel piece in a general direction toward the toe piece.

17. The binding system of claim 16 wherein the spring means includes a first spring member having a first end and a second end and a second spring member having a first end and a second end, the first end of the first spring member and the first end of the second spring member are pivotally secured to the toe piece and the second end of the first spring member and the second end of the second spring member are attached to the heel piece.

18. The binding system of claim 17 wherein the first spring member and the second spring member include a first rod secured to the toe piece and a second rod secured to the heel piece, and further includes an encased spring securing the first rod to the second rod.

19. The binding system of claim 16 wherein the heel piece includes a heel aperture and the cam member includes a cam aperture alignable with the heel aperture, and further comprising:

20. The binding system of claim 16 wherein the cam member includes a heel receiving slot sized and shaped for receiving at least a portion of the heel portion of the boot upon insertion of the heel portion of the boot.