Snowboard boot binding system

Abstract: A snowboard binding system having a binding plate (18), the bottom of which is supported on a snowboard (10). The plate (18) includes a circular-opening (36) in its center which receives a disk shaped hold-down plate (30). The hold-down plate (30) may be secured to the snowboard (10) in several different positions on the snowboard (10) with the binding plate (18) assuming any rotational position with respect to the hold-down plate (30). Additionally, a high-back Support (28) attached at the rear of the binding plate (18) may be rotated along an axis generally normal to the binding plate (18) (and therefore the snowboard (10)) and secured in its rotated position, to enable a rider to transmit forces to the snowboard (10) from a variety of stance positions.

Description: Field of the Invention This invention relates generally to boot binding systems for snowboards. More specifically, the invention relates to a snowboard binding having multiple degrees of freedom and adjustability. In DE-G-91 08 513.6 there is disclosed a snowboard binding system having a base plate and circular fastening disc. In claim 1 below, the pre-characterising portion of the claim is based on this document. Background of the Invention A recently popular sport, snowboarding presents operating conditions and physical demands not found in other skiing-type sports. In snowboarding, the operator stands with both feet on the snowboard, somewhat similar to a slalom water ski. However, in waterskiing, the operator is pulled in a single direction by a power boat. The strength and positioning requirements of the attachment apparatus used for securing the operator's feet to the ski are therefore quite limited. In snowboarding, since the motive force is provided by gravity as the rider travels down a hill, the rider is able to and often must assume body positions not often found in other sports. Specifically, the angle between the midline of the foot and the midline of the snowboard is often greatly altered for different snowboarding styles, such as acrobatics or simple traveling, and for different athletes. It is often the case that either a boot worn by the rider or the binding itself will be provided with a support for the lower leg just above the ankle. However, when the angle of the midline of the foot with respect to the board is changed, this can also change the angle between the leg and the foot. Currently, a simple, rigid support that is merely perpendicular to the board and aligned along the midline of the foot is used. Some of these supports have the capability to fold down against the snowboard surface. Other degrees of freedom are available, but only by disassembly and reassembly of the binding and snowboard. Different riders also have differing requirements as to the distance between the two bindings on the board as well as the binding's position with respect to the lateral dimension of the board. Thus it is an object of the invention to provide a boot binding system for a snowboard that has several degrees of freedom along the surface of the board, that is simple and cost effective to manufacture and that is reliable and efficient in use. Summary of the Invention The above objects are advantageously solved with a snowboard binding in accordance with claim 1. Preferred embodiments demonstrating further objects, features, and advantages of the invention, are defined in the dependent claims. Generally, a boot binding system comprises a binding plate, the bottom of which is supported on a snowboard. The plate includes an opening in its center which receiver a preferably disk shaped hold-down plate. It is preferred that the opening is circular. The hold-down plate may be secured to the board in several different positions on the board with the binding plate assuming any rotational position with respect to the hold-down plate. Additionally, a highback support attached at the rear of the binding plate may be rotated along an axis generally normal to the binding plate (and therefore the board) and secured in its rotated position, to enable a rider to transmit forces to the snowboard from a variety of stance positions. Brief Description of the Drawings The foregoing and other objects, features and advantages of the present invention will be understood more completely by those skilled in the art upon reading the following detailed description in conjunction with a review of the appended drawings, in which: Fig. 1 is a perspective view of a rider on a board having a snowboard binding system according to the invention; Fig. 2 is a perspective view of a single snowboard binding according to the present invention; Fig. 3 is a top view of a snowboard binding according to the present invention; Fig. 4 is a cross sectional view taken along the line IV-IV of Fig. 3 and looking in the direction of the arrows; and Fig. 5 is a schematic view of the pattern of a set of screw-receiving openings formed in a snowboard using the snowboard binding system of the present invention. Detailed Description of the Preferred Embodiments Referring now to the details of the drawings, Fig. 1 shows a snowboard 10 having a snowboard binding system 12 according to the present invention, with a rider 14 having his feet engaged in the system. As can be seen in the figure, the center line of each of the rider's feet, i.e., a line from the heel to the toe, is situated at an angle to the center line A of the board 10. It can also be seen generally that, at each of the rider's ankles, the angle between the lower leg and the foot is somewhat different with each leg, partially due to the spread of the feet and also the varied angle of the feet with respect to the center line of the board 10. Support for the feet, preferably wearing a boot, and the lower legs while in this and various other body positions is provided by each individual binding 16. In Figure 2, the base binding plate 18 that is mounted to the top of the snowboard 10 (Fig. 4) is seen with two side walls 20 rising from it near the heel 22 of the plate 18. At the heel 22 the two side walls 20 preferably extend rearward of the binding plate 16 and connect to form a curved heel wall 24 (Fig. 3). Mounted at two connection points 26 to the side walls 20 is a highback leg support 28 which is adjustable as described more fully below. As seen in Figs. 3 and 4, the binding plate 18 is attached to the snowboard 10 through the use of a hold-down plate 30 having splines, ribs or ridges 32 on at least a portion of its under surface that engage complimentary splines, ribs or ridges 34 on a central aperture 36 in the binding plate 18. As will be described more fully below, the structure of these various components of the binding 16 allows for freedom of movement of the binding plate 18 along the center line A of the board, movement lateral to the center line A of the board, rotation about an axis normal to the board, and rotation of the leg support 28 toward the binding plate 18 and about an axis normal to the board 10. The hold-down plate 30 has an inverted frusto-conical shape where the sloped walls 38 include the ridges 32 that engage the binding plate 18. The aperture 36 in the binding plate 18 has a complimentary frusto-conical shape with sloped walls 40 having complimentary ridges 34. Both sets of ridges 32,34 are symmetrical around their entire circumferences so that they will mate at many discrete positions. For connection to the board 10, the hold-down plate 30 includes three screw-receiving holes 42 which are arranged so as to lie at the vertices of an equilateral triangle. The pattern of holes 42 of the hold-down plate is repeated on the hold-down plate 30 three times in laterally shifted orientation. Preferably, the three repetitions of each hole 42 overlap as shown in Figs. 2 and 3 for quick adjustment by loosening the screws (not shown) used to mount the plate 30, but not removing them, and sliding the hold-down plate 30. Alternatively, the three repetitions of holes 42 could be separate or could be merged into a single oblong hole. The three repetitions of the holes 42 allow the hold-down plate 30 to be shifted to either side of the board in order to achieve further positioning flexibility of the binding plate 18 on the board 10. In addition, a similar pattern of holes 44 is provided on the board 10 to match the equilateral orientation of the holes 42 in the hold-down plate 30 and is repeated twice. Each pattern repetition includes a fourth hole intermediate to two of the holes of the equilateral triangle and being on a circle intersecting the three holes of the triangle. Also, the two triangles are arranged so that they are rotated by 180° with respect to each other, placing the two intermediate holes as close as possible to each other. The pattern of holes 44 permits the hold-down plate 30 to be oriented in four positions that are displaced from each other along the length of the snowboard. Each possible position of the hold-down plate 30, not taking into account the three repetitions of holes 42, is indicated by a circle B in Fig. 5. The pattern 44 permits the hold-down plate 30 to be mounted in two positions facing in one direction and two positions facing the other direction, for a total of four positions, since the rotation of the hold-down plate 30 with respect to the center line A of the board 10 is irrelevant, because the binding plate 18 may be rotated a full 360° relative to the hold-down plate 30. It can be seen, for example, that the two rightmost positions B (as seen in Fig. 5) are formed by adding only one additional hole 44 (at position E) to those holes 44 already used to form the rightmost position B. Once the particular set of holes 44 in the board 10 is determined, the particular repetition of holes 42 in the hold-down plate 30 and its rotational orientation are chosen, the binding plate 18 is held at the desired angular position while the hold-down plate 30 is mounted on top of the binding plate 18 and screwed into the board 10. The holes 44 in the board 10 may also include fetal sleeves having internal threads for sturdier connection to the hold-down plate 30. It will also be appreciated by those skilled in the art that the pattern of holes 44 could be formed in a plate (not shown) embedded within or mounted onto the board 10. It will be appreciated that the construction of the binding plate and hole pattern permit a great deal of freedom in adjusting the position of the bindings fore and aft, laterally and rotationally on the board, as well as the spacing between them. It will also be appreciated by those skilled in the art that the hold-down plate 30 need not be round to achieve the advantages of the pattern of holes 44, but should be symmetrical when rotated 180°. The highback leg support 28 includes an upright portion 46 and two forward diagonally extending arms 48 terminating at connection points 26 with the side walls 20 of the binding plate 18. These two connection points 26 allow pivoting of the highback 28 to a forward closed position (folded down) (indicated by arrow D, Fig. 4) for transport or storage. The highback 28 may also be rotatably adjusted about the vertical axis (indicated by arrow C, Fig. 3) due to several structural elements. At the heel of the binding 16 the contacting surfaces of the highback 28 and the heel wall 24 of the binding plate 18 are both generally semi-cylindrical having similar radii. Additionally, the connection points 26 of the highback 28 are bolted through mounting holes 50 that are oblong along the length of the side walls 20. Therefore, it is possible to move one connection point 26 towards the heel while moving the other connection point 26 towards the toe of the binding 16, creating a rotation of the highback 28 about the vertical axis. To insure positive locking of the highback 28 in its rotated position, the outer surface of the side walls 20 adjacent the oblong mounting holes 50 is provided with splines, ribs or ridges 52. Preferably, a bolt 54 and washer 56 are used with a corresponding nut 58 to lock the connection points 26 in place, the washer 56 having complimentary splines, ribs or ridges to those around the oblong mounting holes 50. The preferred binding 16 shown in Figs. 2, 3 and 4 is specifically designed for a left foot in that the front of the binding plate is skewed to the right side to accommodate the ball and large toe of the foot. Of course, this can simply be mirror-imaged to result in a similar binding for the right foot. The front areas of the side walls 20 are preferably provided with a plurality of holes 60 or any other attachment points necessary to attach accessories (not shown) to the binding 16, such as straps for holding a boot in the binding. A similar hole 62 is formed toward the rear of the side walls 20 for attachment of an ankle strap (not shown). All of the components of the binding system 12 shown in Figs. 1-4, except the nut 58, bolt 54 and washer 56 used to secure the highback 28, are preferably formed of a high impact, high strength plastic, such as polycarbonate or any other known plastic material. These components can be formed by injection molding or any known manufacturing technique. Of course, other materials able to withstand the significant forces exerted during operation of the snowboard can be used similarly. While the preferred embodiments shown and described are fully capable of achieving the objects of the present invention, these embodiments are shown and described only for the purpose of illustration and not for the purpose of limitation, and those skilled in the art will appreciate that many additions, modifications and substitutions are possible without departing from the scope of the invention as defined in the accompanying claims.

Claims: A hold-down plate (30) for a snowboard binding (16) for mounting a boot to a top surface of a snowboard (10) with incremental adjustment of the angle of the binding relative to the length direction of the snowboard, the hold-down plate (30) having a top surface, a bottom surface to face the top surface of the snowboard, walls (38) which co-operate with a peripheral wall of an opening (36) in a base plate of a snowboard binding, and a plurality of through apertures (42) for receiving fastening elements to fasten the hold-down plate to said snowboard top surface; the hold-down plate being characterised in that said walls (38) define an annulus of the hold-down plate which is of frusto-conical shape whereby the walls of the hold-down plate can engage, from above, a respective annulus of the base plate opening which is of complementary circular frusto-conical shape, as the hold-down plate (30) is tightened down towards the top surface of the snowboard by the operation of the fastening elements in the through apertures of the hold-down plate. A hold-down plate as claimed in claim 1, wherein the through apertures in the hold-down plate define the vertices of a triangle within which lies the centre of the said frusto-conical annulus of the hold-down plate, whereby the hold-down plate is apt for fastening to the snowboard with three fastening elements, one at each of the vertices of said triangle. A hold-down plate as claimed in claim 1 or 2 in which the surface of the wall on the frusto-conical annulus is provided with mating features (32, 34) for setting a step-wise increment between successive rotational orientations of the hold-down plate relative to the base plate. A hold-down plate as claimed in claim 3 wherein the mating features comprise a multitude of radially extending ridges (32). A hold-down plate as claimed in any one of the preceding claims wherein the wall forms an unbroken circle around the circumference of the frusto-conical annulus. A snowboard binding base plate (18) for mounting a boot to the top surface of a snowboard (10), the base plate (18) having a round opening (36) to receive a hold down plate which, when tightened down onto the top surface of the snowboard, holds the base plate down onto the snowboard top surface, the base plate having an annular load transfer abutment surface extending around the periphery of the round opening (36) to co-operate with a complementary load transfer abutment surface on the periphery of the hold down plate, to transfer loads between the hold down plate and the base plate and allow incremental rotational adjustment of the base plate relative to the hold down plate and to the length direction of the snowboard; characterised in that the annular abutment surface is frusto-conical facing upwards. A snowboard binding (16) for mounting a boot to a top surface of a snowboard (10), the binding comprising an assembly of: i. a base plate (18) having a round opening (36), ii. a hold-down plate (30) having a top surface, a bottom surface to face the top surface of the snowboard, walls (38) which co-operate with the base plate around the opening (36) in the base plate and a plurality of through apertures (42) for receiving fastening elements to fasten the hold-down plate to said snowboard top surface; whereby iii. the walls (38) of the hold-down plate (30) engage, from above, the base plate around the round opening when the hold-down plate (30) is itself tightened towards the top surface of the snowboard; and iv. the walls co-operate with the base plate around the opening (36) to define a plurality of engagement dispositions each at a different rotational orientation of the binding relative to the hold down plate, thereby to provide incremental adjustment of the angle of the binding relative to the length direction of the snowboard, and also to prevent rotation of the base plate relative to the snowboard when the hold down plate is tightened down, yet permit rotation of the base plate relative to the snowboard and the hold down plate between the said rotational dispositions when the hold down plate is above its tightened down position, the binding being characterised in that: v. said hold-down plate and said base plate include respective annuli of complementary frusto-conical shape which engage when the hold-down plate is tightened down. A binding as claimed in claim 7 wherein the through apertures define the vertices of a triangle within which lies the centre of said frusto-conical annulus of the hold-down plate. A binding as claimed in claim 7 or 8 wherein the base plate (18) and the hold down plate (30) each have complementary mating features (32, 34) which set a stepwise increment between successive rotational orientations. A binding as claimed in claim 9 wherein the mating features comprise a multitude of ridges (32) radially extending from the centre of the hold down plate and located within an annulus of said hold down plate. A binding as claimed in claims 9 or 10 wherein the mating features comprise a multitude of ridges (34) radially extending from the centre of the base plate opening and arranged on an annulus around the opening. A binding as claimed in any one of claims 7 to 12 wherein the hold down plate has a circumferential wall (32) which is an unbroken circle. A binding as claimed in any one of claims 7 to 12 wherein the hold down plate is received within the base plate opening such that, when tightened down, it is flush with the top surface of the base plate. A base plate as claimed in claim 6 or a binding as claimed in any one of claims 7 to 13, including a support (28) for the back of the leg of the rider and comprising: means to enable rotational adjustment (50, 52) of the leg support (28) with respect to the portion of the plate (18) that defines the orientation of the boot, about an axis that is not parallel to the plane of the plate (18). A base plate or snowboard binding as claimed in claim 14, wherein said axis is substantially normal to the plate. A base plate or binding as claimed in claim 14 or 15 characterised in that the leg support (28) is mounted to the plate at first and second adjustable attachment points (26). A base plate or binding as claimed in claim 16, the plate (18) having first and second sidewalls (20) one on each of the opposing sides of the plate and wherein the first and second adjustable attachment points (26) are respectively disposed on the first and second sidewalls. A base plate or binding of claim 17, characterised in that each of the first and second sidewalls is adapted to receive a screw (26) to mount the highback leg support (28) thereto in one of a plurality of adjustable positions. A base plate or binding of claim 16, 17 or 18, wherein the adjustment of the first and second attachment points (26) is forward and rearward along a length of the plate. A base plate or binding of any of claims 16 to 19 characterised in that the adjustment is by a pin and slot construction. A base plate or binding of claim 20 characterised in that the first and second sidewalls (20) extend along a length of the plate, and wherein each of the first and second sidewalls includes an elongated screw hole (50) extending along the length of the plate. A base plate or binding of any of claims 14 to 21, characterised in that the mounting of the leg support (28) to the plate permits rotation of the support about an axis that is parallel to the plate. A base plate or binding of claim 22, characterised in that rotation of the leg support (28) about said plate-parallel axis permits rotation of the support into a folded down position. A base plate or binding of any of claims 16 to 23, wherein the leg support includes an upright portion (46) and two forward extending arms (48) each of which is mounted to a respective one of the first and second adjustable attachment points (26). A base plate or binding of any of claims 14 to 24, wherein the plate includes a semi-circular heel wall (24). A base plate or binding of claim 25, as dependent on claim 17, wherein the first and second adjustable attachment points (46) are disposed on the first and second sidewalls (20) and below the heel wall (24). A base plate or binding of claim 25 or 26, in which the heel wall (24) includes a semi-circular contacting surface adapted to contact the highback leg support (28) and the leg support (28) has a complementary semi-circular contacting surface adapted to contact the contacting surface of the heel wall (24). A base plate or binding of claim 27, characterised in that the contacting surfaces of the highback leg support (28) and the heel wall (24) have substantially the same radii.

Inventors: CARPENTER JAKE BURTON, DODGE DAVID, CARPENTER, JAKE BURTON, DODGE, DAVID
Applicants: BURTON CORP, THE BURTON CORPORATION
Application year: 1993
Main classification: A63C9
IPC codes: A63C9