Laterally sliding roller ski
A roller ski allowing the skier to slide laterally in a manner similar to a snow ski. The system includes at least one ski and it would attach one foot per ski. Each ski has an optionally height and longitudinal angularly adjustable center platform for fixturing the skier's foot with an optionally releasable ski binding system, an optionally height and longitudinal angularly adjustable front tip and rear tail for attaching at least four fixed wheels, and at least two biased pivoting casters which are all positioned along the center platform's longitudinal axis. The fixed wheels function similarly to conventional roller skate trucks. The casters rotate to align themselves with the direction of force exerted on the center platform. The casters are spring biased to align them selves with the longitudinal axis of the center platform. A height differential between the wheels and rollers enables the skier to transfer weight from one to the other, alternating between the carving and sliding characteristics of snow skis. Another option is at least one ski pole for increased ease of skier balance and self propulsion, with modified tips to accommodate more surfaces than just snow.
This invention relates to a roller ski, specifically to one that can transition in and out of a mode of controlled omnidirectional motion, and be able to stop on inclined surfaces, in a manner similar to the behavior of a snow ski.
Throughout roller skiing's history, which dates back to the 1930's, the basic configuration of equipment has been consistent: skis, single axis rotational wheels, some form of fixturing the wheels, an optional mechanical braking system and some form of restraining the skier's feet. Product advances have always occurred in the context of this basic configuration. Improvements in wheel, bearing and ski material and skier foot fixturing have been made but the essential functionality of the skis nor their motion characteristics have been changed. During the history of roller skiing, snow skiing has also existed and grown in popularity. The market desired lateral motion experienced during snow skiing result from complex interactions between the skier, ski and snow conditions. To simplify, two general motion characteristics can be readily identified and these are described below. Many of these motions are common to the water sport known as water skiing. The discussion below limits itself to snow skiing because of its direct similarities to roller skiing.
First, a snow skier can turn by shifting their weight and rotating their body to determine direction of travel. This effect results from the presence of side cut and flex in the ski design. As the ski leans onto its edge, it turns an arc equivalent to the radius of the ski's edge. If this type of turn is executed cleanly, it is referred to as “carving” and involves little or no lateral slippage of the ski or skier. The skier can control the severity of the turn radius by transferring more or less weight. Roller skates have long replicated this turning behavior through the mechanical design of roller skate trucks. The truck's simple design turns the skate through gentle or severe turns depending on the amount of weight shift, lateral leg input, and body rotation by the skater.
The other general motion characteristic of a snow ski is its ability to offer a second direction of travel, other than the forward/backward direction. The skier can adjust their weight and rotate their body such that it causes the ski to slip forward, backward, sideways or some amount of each direction. Given that pure carving is limited to a forward component of motion; full omnidirectional motion can be achieved by the introduction of lateral motion. Lateral motion frequently is represented in the form of skidding, as when a car skids while turning on a slick surface. A snow skier can engage this second direction of travel with a velocity that is as great, or even greater than the forward motion component.
It should be noted that the aforementioned lateral, or 2nd generation, direction of travel has never been available to the general roller skiing or roller skating market. Some expert roller skiers and skaters maybe able to execute a technique referred to as “power sliding”, where, through brute force alone, a rider would drive their roller ski or skate to slide sideways. This maneuver never gained wide spread popularity for several compelling reasons: (1) it was very difficult to learn and execute and thus potentially dangerous due to risk of falling; (2) it requires considerably high speeds and therefore greater risk of damaging impact forces in event of falling; (3) overcoming the considerable friction of the wheels required the users to twist their bodies very hard and place a lot of torsional stress on their knees, ankles and hips; and (4) risk of injury was also high to much of the rest of the body in the event of an failed attempt leading to a collision with the ground or other objects. Powersliding generally requires the skier to be traveling either fully sideways or not at all. All of the subtle mixtures of forward and sideways motion components, which are so compelling on snow skis, are virtually impossible to engage during a powerslide.
These determined attempts by skiers, roller skaters, roller skiers, skate boarders and snow boarders to achieve a second direction of travel are not surprising given the novel feeling of motion that it provides. Lateral sliding enables the skier to perform a wide variety of tricks and maneuvers, a snow skier can rotate 180°, 360° or more, slowly or quickly, while already in motion down a hill. A skier can land a jump in any orientation: backwards, forwards, side ways or anywhere in between—and ski away successfully. In combination with carving, lateral motion lets a skier transition in and out of skidding in a highly controlled manner to maneuver skillfully down a mountain.
Because of the great appeal of snow sports, many attempts have been made to replicate them on land and pavement. Not surprisingly, many of the prior art examples attempt to simulate skiing. Most of these devices ignore the omnidirectional mode. U.S. Pat. No. 4,134,598 to Urisaka (1979) and U.S. Pat. No. 4,805,936 to Krantz (1989) describe wheeled skis that contain a caster in conjunction with other fixed wheels. A wheeled grass ski is described in U.S. Pat. No. 5,195,781 to Osawa (1993) that simulates sidecut, theoretically enabling the device to turn when leaned to the side. U.S. Pat. No. 4,744,576 to Scollan (1988) details a device that lets the skier slide back and forth, while the device itself does not move laterally. None of these examples allow true lateral sliding with respect to the terrain being traveled over.
Amongst the prior art examples attempting to offer true lateral motion, U.S. Pat. No. 5,312,258 to Giorgio (1994) uses an array of ball-type roller bearings, unlike a snow ski or snowboard, this device includes no means for controlling the omnidirectional motion. Also, while perhaps functional on a constructed wooden “half pipe”, it would be functionally undermined by dirt and the rougher surface of pavement on a street or playground. U.S. Pat. No. 3,827,706 to Milliman (1974) uses a combination of pivoting casters and fixed casters where the fixed casters are slightly closer to the ground than the fixed wheels. This would potentially allow the skier to angle the ski in and out of a sliding mode. No means is provided to stabilize the casters or to smooth the transitions as weight is transferred from a pivoting caster to a fixed caster. U.S. Pat. No. 4,886,298 to Shols (1989) employs a complex twisting ski design that combines four casters with normal skateboard trucks. U.S. Pat No. 5,975,546 to Strand (1999) employs a snowboard inspired roller board with both feet on one platform rather than one foot on each ski.
Five patents in this area show the use of a biased, pivoting caster. U.S. Pat. No. 4,460,187 to Shimizu (1984) describes two skis bridled together with a total of only 4 fixed wheels, and U.S. Pat. No. 5,125,687 to Hwang (1992) describes a single board for simulating the parallel skiing body position. Both inventions have a single caster towards the front, with an extension spring tensioning the caster to point straight ahead. These inventions do not allow lateral sliding; they do not permit the caster to rotate through 180° or 360°; they do not allow for the possibility of multiple locations of bias on the caster; and they do not permit the characteristics of the bias force to be optimized. The skis described in U.S. Pat. No. 4,886,298 to Shols (1989) incorporates a bias via a hinge and a compliant mounting surface. As weight is applied to the ski, the caster tilts along the hinge axis, biasing the caster in the forward direction. This configuration satisfies only the ability to rotate 360° unimpeded, It does not permit more than one direction of bias; its force profile starts low and grows gradually, allowing wobbling and doing little to help the rider back into the straight ahead position; and the force profile cannot be modified. U.S. Pat. No. 5,975,546 to Strand (1999) and U.S. Pat. No. 6,419,249 to Chen (2002) incorporates bias via a spring force assisted cam system within laterally sliding roller board systems. They do not reference a ski system, nor differentiating and respectively adjustable ground clearance settings of the center platform Δhc versus front tip and rear tail planes, nor the angularity adjustability of the front tip and rear tail innovations that this present invention uncovers for further dynamic stability improvement.
Biased casters that allow unimpeded 360° rotation and specific force profiles are also described by U.S. Pat. No. 4,246,677 to Downing and Williams (1981) and U.S. Pat. No. 4,280,246 to Christensen (1981). These inventions however relate to semi-automated cart delivery systems typically used in hospitals for transporting food and medication. When the carts are lifted, the pivoting casters rotate to a predetermined angle, allowing them to move through an automated system. When the casters are touching the ground, the inventions function only to lessen wheel flutter. They are not intended to augment the cart's motion and steering characteristics.
Another distinguishing innovation of this invention from any prior art is the ground clearance and angularity adjustability of the ski. The center platform, where the skier's foot is fixtured, can be raised, lowered and rotated along the lateral center axis with respect to the ground with the use of at least one spacer and/or a bracketry system (not shown) attached between the center platform and front tip, and/or between the center platform and rear tail. These ground clearance and angularity settings can also be designed into a one piece integral ski design (not shown) that would integrate the center platform, front tip and rear tail. This innovation greatly improves the skiing experience by creating the option to lower the skier's center of gravity by bringing them self closer to the ground, thereby improving dynamic feedback when steering or controlling speed. Straight line stability can also be increased as speed increases when compared to a flat, single plane platform above the wheel assembly mounting surfaces. This innovation adds an invaluable amount critical functionality to the invention. It allows greater customization for varying application and user skill level, thereby increasing marketability and multi role usability.
Innovations have also occurred in the art of fixed wheel axle assembly design, also known as trucks. Trucks are the axle assemblies used for supporting and actuating fixed wheels on skate boards, roller skates, Strand's roller board, as well as this invention. U.S. Pat. No. 6,315,312 to Reyes, U.S. Pat. No. 6,739,603 to Powell and U.S. Pat. No. 7,413,200 to Horn all describe benefits in the application of skate boarding that may also benefit this laterally sliding ski application.
SUMMARY OF THE INVENTIONThe object of this present invention is to provide a laterally sliding roller ski comprising at least one substantially rigid ski structure, for supporting at least one foot of a user, the ski structure having a central longitudinal axis and the following components:
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- [1] a center platform that the user stands upon;
- [2] a front tip;
- [3] a rear tail;
- [4] first and second longitudinally spaced wheel assemblies attached to the ski, each wheel assembly including:
- [a] first and second laterally spaced fixed wheels respectively mounted for rotation about first and second rotational axes;
- [b] fixed wheel mounting means attached to the front tip and rear tail, respectively and oriented generally transversely thereto, the fixed wheel mounting means being coupled to the first and second fixed wheels, respectively and being configured to maintain a first and second rotational axes of the fixed wheels in mutually parallel relation during steering of the ski structure, the fixed wheel mounting means being in mechanical communication with the center platform for steering the ski structure upon tilting of the center platform and being biased for defining a direction of travel along the longitudinal axis when the center platform is in a laterally non-tilted orientation, with the center platform extending substantially parallel, at a longitudinally adjustable angle, with respect to a supporting surface;
- [c] at least two longitudinally spaced biased caster assemblies attached to the ski structure and extending downwardly therefrom, each caster assembly including at least one associated roller and being mounted for pivotal movement about a vertical axis, each caster assembly being configured to bias the associated roller into a first and a second pivotal position;
- [d] the biased caster assemblies being positioned along the central longitudinal axis, each biased caster assembly having a lower most surface positioned lower than a lower most surface of each of the fixed wheels;
- [e] biased caster assembly mounting means attached to the front tip and rear tail, respectively wherein weight of the user is supported primarily by the biased caster assemblies when the center platform is in the laterally non-tilted orientation to permit movement of the ski structure in any direction of travel;
wherein the user may selectively cause an increased portion of their weight to be supported by one of the fixed wheels to thereby permit steering and speed control of the roller ski by movement of the fixed wheels relative to the center platform upon tilting of the center platform, and wherein each of the fixed wheels having a laterally outward directed surface, the distance between the outwardly directed surfaces of the first and second fixed wheels defining a wheelbase width, the ratio of the center platform height to the wheelbase width being less than 1.5.
Accordingly, it is the objective of the present invention to bring a new freedom of movement to roller skiing. This freedom is best represented by the motion and balance characteristics of snow skiing. Specifically, the objects and advantages are:
- (a) to provide the ability to “carve” as a conventional roller ski or roller skate can, where leaning weight to one side causes the device to turn in that direction;
- (b) to provide the ability to shift into a mode of omnidirectional behavior, where the device can easily travel forwards, backwards, sideways or any combination thereof;
- (c) to provide the ability to transition smoothly and controllably between carving and the omnidirectional mode;
- (d) to provide a user interface that simulates the balance characteristics of snow skiing and other ski and roller sports, where the omnidirectional mode is engaged when weight is relatively evenly distributed across the skis and this mode can be exited by transferring significant weight to the ski's edge;
- (e) to provide the ability to rotate the ski 180°, 360°, or more repeatedly, without lifting or unweighting the ski, while in motion over terrain;
- (f) to provide a means such that the relative ease of entering the omnidirectional mode can be increased or decreased according to the user's preference;
- (g) to provide the ability to ski on different types of terrain, including paved surfaces, wood, plastic, concrete, glass, grass, dirt, any composite blend of the aforementioned and/or even ice;
- (h) to provide a means for speed control;
- (i) to provide a means for self propulsion;
- (j) to provide a means for height and longitudinal adjustability to change the dynamic characteristics and types of the terrain that can be skied over; and
- (k) to create a device that is economical to produce and sell.
Further objects and advantages of my invention will become apparent from a consideration of the drawings and ensuing description.
A typical embodiment of the present invention is shown in
A skier 25 positions them self on the center platform 21 in a stance similar to that used for snow skiing or conventional roller skiing, with both feet 27 roughly parallel to a longitudinal center line 29. This stance allows skier 25 to easily shift their weight from left to right or from toes to heels. Skier 25 cannot move freely about the surface of center platform 21 since they are bound to it with the use of optional snow ski style boots 26 that are fixtured within a releasable ski binding assembly 27 which restrains the toes and heels until an over powering lateral and/or torsional force overpowers the releasable ski binding 27 release spring forces. The releasable ski binding assembly 27 can be adjustable along the longitudinal center line 29 of the ski's center platform 21 for varying foot length, and skier weight—as seen with snow skis. The longitudinal center line 29 position of the entire releasable ski binding assembly 27 can also be adjusted to change the center of gravity and therefore the dynamic input and feedback experienced between the skier 25 and the ski 20. Unlike any prior art, the clearance and the angularity of the center platform 21, front tip 23 and rear tail 24 with respect to the ground can be individually adjusted with the use of at least one spacer 28 and/or a bracketry system (not shown), wedge shaped base plate spacers (not shown) under the base plates(s) 34 or by use of a one piece integral ski design (not shown) that would combine the center platform 21, front tip 23, rear tail 24 and any respective ground clearance offsets and angles in between, to once again change the dynamics of the skiing experience. The optional ground clearance and angularity settings could be permanently designed into a one piece rear ski (not shown), making it a more custom or specific application device. The one piece design could also simply be entirely flat, with the front tip 23, center platform 21 and rear tail 24 all one the same plane, thereby maximizing the ground clearance of the center platform. Regardless of height adjustability, an integral single piece design would have a better stiffness to weight ratio since the respective mating hardware junctions would be eliminated. However, if the skier 25 wishes to have a multi-piece ski 20 with ground clearance and angularity adjustability of the center platform 21, front tip 23 and/or rear tail 24, the skier 25 can adjust the trade off between straight-line/cornering stability and ground clearance needed to travel over rough and uneven surfaces. Like any ground transportation device, an increase in ground clearance directly increases the level of surface unevenness which can be traveled over, however it also drives an increase in center of gravity distance to the ground and thereby a negative result on the straight line and cornering and stopping stability and responsiveness, which is increasingly needed with speed increase. The changing in angularity of the front tip 23 and or the rear tail 24 nor use of base plate spacers has not been depicted in the figures for that sake of simplicity because the front and rear biased caster assemblies 32, front tip 23, and rear tail 24 are height adjustable already by use of the platform spacers 28 and caster height adjustment slot 52.
As shown in the
Referring now to
In general, the spring bias is implemented as referred to hereinabove for Chen and Strand patents. Specifically, the respective pivoting roller 45 is attached to a caster 46 and rotates via a bearing assembly 48 that is housed within the base plate 34 which is attached to the underside of front tip 23 and rear tail 24, as shown in
The roller ski of this invention succeeds because of the unique interactive effect between fixed wheel assembly 30 and biased caster assembly 32. Together, the assemblies 30,32, allow the skier to control the amount of friction between fixed wheels 39 and the surface being traveled over, whether that surface is paved asphalt, concrete, grass, dirt, rock, plastic, wood or even ice if the contacting surfaces of the pivoting rollers 45 and fixed wheels 39 were properly modified with some form of studs as seen on motorcycle and automobile tires. For ice, the fixed wheels 39 would also need the edges that contact the ground during speed control and steering to be hard, sharp and preferably made of either a metal, plastic, ceramic, carbon or composite of the aforementioned materials to provide the necessary friction to control speed and change direction. As skiers increase friction by laterally shifting weight from the pivoting rollers 45 to the fixed wheels 39, the skier 25 can carve turns. As they lessen friction by bringing more weight onto the pivoting rollers 45 along the longitudinal center line 29, fixed wheels 39, the ski 20 can slide laterally enabling the skier 25 to engage a mode of omnidirectional motion. This unique interaction of fixed wheels 39 and pivoting rollers 45 is demonstrated in
As the skier 25 transitions their weight on and off of fixed wheels 39, the design of biased caster assembly 32 has many compelling advantages. First, the roller ski engages a stable position when traveling straight forward and also when traveling straight backwards. This makes it symmetrical in performance, allowing 180° rotations, just like a snow ski. Second, the bias spring force that holds the biased caster assembly 32 aligned straight limits wobbling of the pivoting roller 45 and enables the skier 25 to easily track a straight line when desired. Yet the skier can also easily rotate the skis sideways by deliberately applying force to overcome the caster spring resistance along its respective spring force profile as described in greater detail by Strand and Chen. Third, this bias is especially effective at returning the skier to a straight ahead position after executing a slide or a rotation. As the skier 25 brings the ski(s) close to straight ahead, there is a very subtle but reassuring feeling of the pivoting roller 45 locking into a forward alignment. Fourth, while the caster 46 is stable at two positions, it is free to rotate an infinite number of times unimpeded. This is especially important as snow skiers frequently seek to rotate successively in one direction. Fifth, the aforementioned bias profile can easily be modified by changing the shape of cam (prior art), the spring stiffness (prior art) or with the addition of a spring pre-load spacer (not shown). Thus, numerous custom force profiles are possible. In addition, the force profile of the front biased caster assembly 32 can be configured differently from the back biased caster assembly 32, as is the same case with the torque of the fixed wheel assembly stud threaded nut 44.
Accordingly, it can be seen that the roller ski brings a new freedom of movement to roller skiing, approximating many of the movements found in snow skiing. The roller ski provides the ability to “carve,” as a conventional roller ski can, where leaning weight to one side causes the device to turn in that direction. It permits a mode of omnidirectional motion, where the device can easily travel forwards, backwards, side-ways or any combination thereof. It provides the ability to transition smoothly and controllably between the carving mode and the omnidirectional mode.
The laterally sliding roller ski also provides a user interface that simulates the balance characteristics of snow skiing and other ski and roller sports, where the omnidirectional mode is engaged when the skier's weight is relatively evenly distributed across the skis and this mode can be exited by transferring weight to the ski's edges. It allows rotations of 180°, 360°, or more, repeatedly, without lifting or un-weighting the skis, while in motion over terrain. It includes a height and angularity adjustment means such that the relative ease of entering the omnidirectional mode can be increased or decreased according to the user's preference. The adjustability, in combination with the aforementioned material selection options, also allows provides the ability to ski on a variety of terrains, including paved asphalt, concrete, grass, dirt, rock, plastic, wood or even ice. It enables the skier 25 to propel themselves and also slow down when necessary, by increasing the friction between fixed wheels 39 and the surface traveled over. Finally the roller ski is relatively simple in its design and would be economical to produce, sell and modify for custom and general use applications.
Although the description above contains many specificities, these should not be construed as limiting the scope of the invention but as merely providing illustrations of some of the presently preferred embodiments of this invention. Thus the scope of the invention should be determined by the appended claims and their legal equivalents, rather than by the examples given.
Claims
1. A roller skiing device comprising: at least one substantially rigid ski structure, for supporting at least one foot of a user, the ski structure having a central longitudinal axis and the following components: wherein the user may selectively cause an increased portion of their weight to be supported by one of the fixed wheels to thereby permit steering and speed control of the roller ski by movement of the fixed wheels relative to the center platform upon tilting of the center platform, and wherein each of the fixed wheels having a laterally outward directed surface, the distance between the outwardly directed surfaces of the first and second fixed wheels defining a wheelbase width, the ratio of the center platform height to the wheelbase width being less than 1.5.
- [1] a center platform that the user stands upon;
- [2] a front tip;
- [3] a rear tail;
- [4] first and second longitudinally spaced wheel assemblies attached to the ski, each wheel assembly including: [a] first and second laterally spaced fixed wheels respectively mounted for rotation about first and second rotational axes; [b] fixed wheel mounting means attached to the front tip and rear tail, respectively and oriented generally transversely thereto, the fixed wheel mounting means being coupled to the first and second fixed wheels, respectively and being configured to maintain a first and second rotational axes of the fixed wheels in mutually parallel relation during steering of the ski structure, the fixed wheel mounting means being in mechanical communication with the center platform for steering the ski structure upon tilting of the center platform and being biased for defining a direction of travel along the longitudinal axis when the center platform is in a laterally non-tilted orientation, with the center platform extending substantially parallel, at a longitudinally adjustable angle, with respect to a supporting surface; [c] at least two longitudinally spaced biased caster assemblies attached to the ski structure and extending downwardly therefrom, each caster assembly including at least one associated roller and being mounted for pivotal movement about a vertical axis, each caster assembly being configured to bias the associated roller into a first and a second pivotal position; [d] the biased caster assemblies being positioned along the central longitudinal axis, each biased caster assembly having a lower most surface positioned lower than a lower most surface of each of the fixed wheels; [e] biased caster assembly mounting means attached to the front tip and rear tail, respectively wherein weight of the user is supported primarily by the biased caster assemblies when the center platform is in the laterally non-tilted orientation to permit movement of the ski structure in any direction of travel;
2. The roller skiing device according to claim 1, including an abrasion resistant coating on all external surfaces.
3. The roller skiing device according to claim 1, including at least one ventilation hole and use of breathable materials.
4. The roller skiing device according to claim 1, including at least one detached roller ski pole held by the user comprising:
- [1] a substantially rigid pole structure supporting the load of a user, having a central longitudinal axis;
- [2] at least one of a longitudinally oriented hand grip and a wrist strap;
- [3] a ski pole tip located at the bottom end of the pole.
5. The roller skiing device according to claim 1, wherein at least one of the center platform, front tip and rear tail are mounted for individual adjustability in their distance and longitudinal angle with respect to the ground.
6. The roller skiing device according to claim 1, including at least one spacer adjacent at least one of the following elements: the center platform, front tip and rear tail, in order to accommodate at least one of the variations in distance and angle with respect to the ground and said elements.
7. The roller skiing device according to claim 1, wherein the center platform, front tip and rear tail are configured as one integral non-adjustable ski structure.
8. The roller skiing device according to claim 1, wherein the fixed wheel mounting means comprise at least one axle.
9. The roller skiing device according to claim 1, wherein the first and second rotational axes are coincident.
10. The roller skiing device according to claim 1, wherein the first and second laterally spaced fixed wheels are respectively mounted for adjustability in the distance of their respective lateral spacing;
11. The roller skiing device according to claim 1, wherein the first and second fixed wheel assemblies are respectively mounted for adjustability in their respective longitudinal spacing;
12. The roller skiing device according to claim 1, wherein the second pivotal position of the roller is angularly displaced by 180° from the first pivotal position.
13. The roller skiing device according to claim 1, wherein each of the caster assemblies is configured to bias the associated roller into a first and second pivotal position.
14. The roller skiing device according to claim 1, wherein the first and second biased caster assemblies are respectively mounted for adjustability in their longitudinal spacing.
15. The roller skiing device according to claim 1, wherein each roller has a lowermost surface normally positioned lower than a lowermost surface of each of the fixed wheels.
16. The roller skiing device according to claim 1, wherein the position of the lowermost surfaces of the rollers is adjustable relative to the lowermost surfaces of the fixed wheels.
17. The roller skiing device according to claim 1, wherein the user may cause an increased portion of their body weight to be applied on the ski structure in a vector whereby it permits release from the ski structure.
18. The roller skiing device according to claim 1, wherein the biased caster assemblies are positioned along the central longitudinal axis, with at least one caster assembly longitudinally inboard of the fixed wheels.
19. The roller skiing device according to claim 1, wherein the biased caster assemblies are positioned along the central longitudinal axis, with at least one caster assembly outboard of the fixed wheels.
20. The roller skiing device according to claim 1, wherein the ski structure can be adjusted to engage in at least one ski and roller sport application.
21. The roller skiing device according to claim 1, wherein the ski structure can be adjusted to accommodate differences in weight variation and distribution.
22. The roller skiing device according to claim 1, wherein the user can utilize a ski style boot and releasable binding system.
23. The roller skiing device according to claim 1, wherein the user can utilize a non-releasable boot and binding system.
Type: Application
Filed: Nov 18, 2010
Publication Date: May 24, 2012
Inventor: Alexander S. Langer (Wallingford, CT)
Application Number: 12/927,578