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The present invention relates generally to off-season alpine training apparatuses and electro-mechanical sliding simulators. More particularly, the disclosure describes a low-profile, multi-roller tracked sport chassis featuring a fixed, non-linear vertical profile geometry. This configuration is structurally engineered to translate changes in a skierβs lateral lean angle into dynamic adjustments of the active track contact patch, effectively simulating an alpine ski sidecut on un-groomed, off-road terrain.
Structural Elements of the Chassis Assembly
Referring to the structural framework layout, the apparatus comprises an elongated rigid chassis frame constructed from a high-tensile material, preferably extruded or CNC-machined 6061-T6 aluminum or molded carbon fiber. The frame defines an internal housing channel bounds by parallel vertical side-walls and internal load-bearing structural cross-braces.
An endless, flexible track loop is wrapped longitudinally around the exterior perimeter of the frame. The track loop consists of an internal high-tensile aramid-corded core bonded to an external polyurethane carcass. The external surface of the track features a plurality of spaced, transverse structural polymer cleats or lugs designed to interface with loose dirt, gravel, or grass surfaces.
Suspended rotatably within the internal housing channel of the frame is a multi-roller guide array consisting of twelve independent tracking rollers. Each roller is machined from a high-density, low-friction polymer, such as polyoxymethylene (POM/Delrin), and houses a pair of ungreased, high-precision Silicon Nitride (
) full-ceramic ball bearings. The tracking rollers are spaced uniformly along the longitudinal axis of the frame with a center-to-center axle spacing of approximately 71.5 mm, ensuring minimal clearance between adjacent roller diameters to prevent internal sagging or puckering of the endless track loop under localized vertical loading.
The Progressive Rocker Geometry Configuration
The critical mechanical novelty of the invention resides in the vertical alignment matrix of the multi-roller guide array relative to the lower edge boundaries of the rigid chassis frame. Unlike conventional tracked or industrial inline configurations that position rollers on a flat horizontal plane, the roller axles of the present invention are constrained along a fixed, symmetrical progressive rocker profile resembling a continuous parabolic curve or "banana" geometry.
The spatial configuration of the twelve rollers is precisely indexed as follows:
The Primary Contact Zone: The central cluster of rollers, specifically Rollers 4, 5, 6, 7, 8, and 9, are aligned coaxially along a perfectly flat, common horizontal baseline plane. When the apparatus is positioned vertically perpendicular to a flat surface, these six central rollers bear the primary vertical load of the user, compressing the active ground contact patch to a highly maneuverable longitudinal length underfoot.
The Intermediate Transition Transition Zone: Moving outward toward the longitudinal extremities, the axles of Rollers 3 and 10 (immediately forward and aft of the central cluster) are vertically displaced upward from the horizontal baseline plane by a fixed increment of exactly 1.5 mm. Similarly, the axles of Rollers 2 and 11 are coaxially aligned with Rollers 3 and 10 at the same 1.5 mm vertical displacement window.
The Terminal Entry/Exit Zone: The outermost terminal elements, Rollers 1 and 12 (positioned at the absolute tip and tail boundaries of the chassis frame), are vertically displaced upward from the horizontal baseline plane by a fixed increment of exactly 3.0 mm.
Functional Mechanics and Carving Simulation
During standard linear operation on a horizontal surface, the track loop under pressure is driven solely by the flat central roller cluster (Rollers 4 through 9). This configuration minimizes rolling resistance and allows the user to easily pivot or steer the chassis about its central sweet spot.
When a user initiates an alpine-style turn, the chassis frame is tilted along its longitudinal axis relative to the ground plane. As the lean angle increases, the progressive vertical elevation of the intermediate (1.5 mm) and terminal (3.0 mm) rollers forces the flexible track loop to conform to the rigid parabolic arc of the chassis.
This mechanical deflection forces the track to expand its effective contact patch outward from the center cluster to the tip and tail rollers. The resulting variable-radius geometry creates a continuous, rockered edge profile that cuts an arc into dirt or grass, replicating the carving dynamics, fore-aft weight distribution, and edge control of an on-snow shaped alpine ski.
