CA2617468A1 - Motorized snowboard - Google Patents

Abstract

A gasoline engine powered snowboard having an endless track trained about a support frame containing driven and idler wheels. A molded chassis having alternative contoured track support pans cooperate with flexible track surfaces (e.g. fringe or pleat members) and forward and rear foot supports to enable steering with foot and body movements. Engine operation is directed from an upright operator support column and directed servos coupled to the engine. One support pan exhibits a beveled contour and includes a recessed elliptic channel; another supports a reciprocating plate and steering wheels. Slit fringe members and pleats along right and left peripheral track edges cooperate with the pan contours and/or wheels to steer the vehicle. UHMW covered drive lugs and formed UHMW stiffener surfaces project from internal track surfaces. Ground contact lugs exhibit contoured thickness profiles, elongated, inverted V- shapes and include recesses. Diverter and agitator assemblies rid snow and ice from the track support assembly.

Description

= i TITLE OF THE INVENTION
MOTORIZED SNOWBOARD

This application claims priority based on United States Patent Application Nos.
11/652,455 and 29/271,188 entitled "MOTORIZED SNOWBOARD" both filed January 11, 2007, which are herein incorporated by reference.

BACKGROUND OF THE INVENTION

The present invention relates to a powered snowboard assembly and, in particular, to a gas engine powered snowboard having an endless track with flexible lateral, peripheral edges (e.g. slots or pleats) supported to rotate about a frame assembly in contact with an interchangeable chassis support pan. A recess in the pan and associated flanges, rails, beveled surfaces and/or a wheeled slider assembly promote track flexion and steering in response to weight adjustments placed on foot control surfaces.

A wide variety of engine powered, personal transport vehicles have been developed for recreational travel over land, water and snow. Some dry land skateboard type vehicles that accommodate a standing operator are shown at US patents 6,435,290;
5,127,488; and 4,143,728. Some snow based vehicles that accommodate seated operators are shown at US patents 4,534,437 and 3,794,131. Several track supported snow vehicles that accommodate standing operators are shown at US patents 6,698,540;
6,193,003;
5,662,186; 5,305,846; 4,984,648; and 4,307,788.

Different types of downhill snowboards and related improvements have also been developed to satisfy the ever changing human desire for challenging recreational devices.
The 5,662,186 patent is directed to a powered snowboard having multi-section operator and engine platforms that align at different inclinations. The vehicle however is not particularly adapted to mimic the operating experience of a conventional un-powered snowboard.

The present invention was developed to provide a motorized snowboard with the agility of a non-motorized snowboard. The device supports a standing operator and, except for engine operation, is controlled and steered with foot movements that substantially mimic the experience of riding a conventional snowboard. Use of the subject snowboard is however not limited to steep or hilly terrain. Instead, the snowboard can be used over moderate hills and undulating or flat terrains to provide an operator a more athletic experience than merely riding a snowmobile.
SUMMARY OF THE INVENTION

It is a primary object of the invention to provide an engine powered vehicle that can be steered with foot and/or body movements.

It is further object of the invention to provide an endless track vehicle that can be operated by an upright operator over a variety of surfaces (e.g. snow, ice, hard pack, sand etc.).

It is further object of the invention to provide an endless track vehicle having an upright hand hold, control column.

It is an object of the invention to provide a vehicle with a support frame having a drive sprocket and a plurality of idler wheels that cooperate with an engine to drive a flexible track mounted to a surrounding chassis.

It is further object of the invention to provide a vehicle with an operator directed cable-type or electromechanical control linkage to the engine, control surfaces or other equipment assemblies.

It is further object of the invention to provide a track having a plurality of slits, pleats or other flexible or resilient surfaces that define flexible track regions that flex, expand and/or contract to accommodate body-shifting movements to steer the vehicle.

It is further object of the invention to provide a track having transverse fringe pieces that support flexible ground contacting lugs.

It is further object of the invention to provide a track having pleats that transversely extend from peripheral track edges to enable track flexion and promote steering.

It is further object of the invention to provide a track having rows of transversely extending lugs that depend from a central track portion and adjoining, laterally staggered, flexible track sections containing steering lugs and wherein the flexible track sections flex and cooperate with contoured chassis support surfaces to promote steering.

It is further object of the invention to provide ground contact steering lugs at flexible track surfaces that exhibit raised isosceles triangular-shaped surfaces and that transversely extend at obtuse angles from interconnected lugs depending from the center portion of the track.

It is further object of the invention to provide a track having stiffener and/or wear rods with formed sections contoured to the track and molded into the track to reduce track friction at contact surfaces with the chassis.

It is further object of the invention to provide a track having ultra high molecular weight (UHMW) stiffener rods or other performance enhancing devices thermo formed to desired shapes and/or bonded contemporaneously with the forming of steering lugs or other track surfaces.

It is further object of the invention to provide an interchangeable, contoured track support pan at the bottom of the chassis that cooperates with drive and steering lugs and flexible track surfaces to steer the vehicle with operator foot and body movements.

It is further object of the invention to provide a track support pan with beveled track engaging surface(s), drive lug receiving recess(es), rail(s) and/or other mechanisms to prevent track dislodgement and promote flexion at adjoining flexible track steering surfaces.

It is further object of the invention to provide a track support pan with a beveled, inverted V-shaped reciprocating slide plate with domed track engaging wheels that selectively direct and/or flex the track to promote steering.

It is further object of the invention to couple a reciprocating track flexing assembly mounted to a to a support pan with spherical couplers to enhance reciprocating steering movements.

It is further object of the invention to provide a track having ultra high molecular weight (UHMW) caps or plugs mounted and/or formed into the drive and/or steering lugs.
It is further object of the invention to provide a snow shielded track flexing assembly.
It is further object of the invention to provide snow relieving surfaces at the endless track that cooperate with a snow collection and diverter shield.

It is further object of the invention to provide a track assembly with snow and ice agitating and exhaust means to discharge ice and snow from within the track assembly.
The foregoing objects, advantages and distinctions of the invention are obtained in alternative track frame assemblies having dedicated or interchangeable track support pans.
In one construction, the snowboard comprises an endless track trained about a track support frame containing driven and idler or "bogie" wheels. The track support frame is mounted to a molded chassis having forward and rear foot supports. A gasoline engine mounts to the chassis and a drive linkage couples the engine to the track support frame and depending endless track. Engine drive power is transferred via a clutch and interconnected chain/belt drive linkages to a drive shaft that supports a track drive sprocket and idler shafts that support drive wheels that engage an interior surface of the track.

Engine operation is directed from an operator's column and cabling and/or electro-mechanical servos coupled to the engine. The bottom surface of the chassis provides a chassis or track support pan that in one version includes a longitudinal recess and contoured surfaces that engage flexible portions of the track to directionally promote track movements to steer the vehicle in response to weight shifting movements at the foot control surfaces. Drive lugs project from the interior track surface, follow the longitudinal recess and engage the drive and idler sprockets. Peripheral edge portions of the track follow shaped contours of the chassis support pan. The support pan can exhibit bevels and/or valleys, recesses, cutouts and/or other surface shapes that flex the track to directionally promote track movement or flexion in cooperative response to operator or other induced movements. The support pan can also support and/or cooperate with assemblies that selectively engage and/or direct flexible steering portions of the track.

The track is presently divided into a center portion containing upright interior drive lugs and flexible fringe or pleated portions. The center portion exhibits a relatively narrow width (e.g. less than one-third the overall track width) and from which the drive lugs project in rows and pass between opposed longitudinal arcuate sidewalls (e.g.
ovular) of a longitudinal recess at the support pan. Lateral movement of the track is limited by contact between the drive lugs and the recessed side walls of the support pan.
Adjoining surfaces of the flexible fringe or pleated track portions contact beveled surfaces at the support pan to promote steering.

The ground engaging lugs exhibit contoured thickness profiles. Depending forward and trailing surfaces taper to a ridged apex. The lateral extension of the forward and trailing lug surfaces define a straight central portion and end portions that obtusely radiate relative to the central portion. Collectively, the lugs direct forward track movement as rows of depending ground contacting lugs at filamentary fringe or pleated portions of the track flex with operator movements as the fringe or pleated portions follow the contoured support pan to directionally promote steering movements.

Ground contact surfaces of the flexible fringe or pleated track portions contain rows of laterally depending steering lugs. The flexible track portions are defined by seriatim, slots or gaps that form fringe pieces or seriatim flexible pleats defined at flexible track surfaces. The fringe and flexible track surfaces support rows of ground engaging steering lugs. The region of ground contact of the steering lugs of each fringe or flexible track piece transversely overlaps the span of steering lugs depending from adjoining fringe pieces or between pleats.

An alternative vehicle assembly provides a track with flexible pleats located along peripheral track edges. The pleats cooperate with an interchangeable chassis/track support pan that contains a reciprocating steering plate having a number of wheels that contact the drive lugs to shift the pleats into contact with beveled surfaces at the support pan. The steering plate is supported from spherical couplers and mounted to accommodate reciprocating lateral movement. Formed axles at the wheels permit independent tilting movement at the wheels to enhance control over wheel-to-drive lug contact and track flexion.

UHMW plastic stiffener rods are molded into the track in parallel co-axial alignment with the steering lugs. The rods are fitted to the track during lay-up and bent during molding to align with desired track surfaces. In one track construction openings or pockets are formed into the steering lugs as the rods are bent to shape. The rods are located and formed to reduce friction and improve the wear resistance of the track with support pan contact.

Other improvements include UHMW plastic caps and/or plugs that are molded or mounted into the track lugs to reduce friction with support pan contact and improve the wear resistance and steering control of the track. Apertures are provided in the track to relieve and/or prevent collection of snow and ice in the chassis and enhance track flexion.
A shield and snow diverter is provided to prevent buildup of snow and ice at the track flexion/steering wheels. Snow and ice agitators and an exhaust assembly cooperates with the shield to remove snow from beneath the chassis and track assembly.

Still other objects, advantages, distinctions, constructions and combinations of individual features of the invention will become more apparent from the following description with respect to the appended drawings. Similar components and assemblies are referred to in the various drawings with similar alphanumeric reference characters.
The description to each combination should therefore not be literally construed in limitation of the invention. It is also to be appreciated the singular improvements can be combined in any variety of track assemblies. The invention should therefore be interpreted within the broad scope of the further appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows a perspective view to a personal, engine powered snowboard assembly.

Figure 2 shows a right side view of the snowboard assembly and wherein the mounting relationship of the engine, clutch, and chain and belt track drive linkages are more apparent.

Figure 3 shows a longitudinal cross section view to the track support frame, drive and idler sprockets.

Figure 4 shows a perspective view to the mounting relation of the track to the bottom track support pan and ground engaging surfaces of the snowboard assembly.
Figure 5 shows a perspective view to the right side and bottom control surface of the snowboard assembly with the drive linkage cowling and track removed.

Figure 6 shows a plan view of the ground engaging, exterior surface of the track depicting the arrangement of the displaced, transverse, laterally extending steering lugs.
Figure 7 shows a transverse cross section view through the track taken along reference lines 7-7 of Figure 6.

Figure 8 shows a transverse cross section view through the track taken along reference lines 8-8 of Figure 6.

Figure 9 shows a diagrammatic plan view of a portion of the track in an un-flexed, straight line condition and wherein alternative operator directed, wheeled steering assemblies (shown in dashed line) are mounted to mechanically flex the track.

Figure 10 shows an end view of the track centered along the chassis support pan in an un-flexed, straight line condition.

Figure 11 shows a diagrammatic view of the interior surface of the track in a flexed, turning condition.

Figure 12 shows an end view of the track laterally shifted relative to the chassis support pan corresponding to the flexed, turning condition of Figure 11 and wherein operator directed steering members of the alternative assemblies of Figure 9 are shown in dashed line.

Figure 13 shows a top plan view to an interchangeable chassis mounted track support pan having a wheeled slide assembly that mechanically flexes the track.
Figure 14 shows a bottom plan view to the interchangeable track support pan assembly of Figure 13.

Figure 15 shows a side plan view to the interchangeable track support pan assembly of Figure 13.

Figure 16 shows a front plan view to the interchangeable track support pan assembly of Figure 13.

Figure 17 shows a cross section view to the slide assembly taken along section lines 17-17 of Figure 13.

Figure 18 shows a cross section view to the slide assembly taken along section lines 18-18 of Figure 13.

Figure 19 shows a cross section view to the slide assembly taken along section lines 19-19 of Figure 13.

Figure 20 is a perspective drawing top and side views to a section of a pleated, flexible track.

Figure 21 shows a top plan view to the pleated track section of Figure 20.
Figure 22 shows an end view to the pleated track section of Figure 20 taken forward of the steering lugs.

Figure 23 shows a side plan view to the pleated track section of Figure 20.
Figure 24 shows a bottom plan view to the pleated track section of Figure 20.
Figure 25 shows a cross section view to the pleated track taken through the steering lugs and along section lines 25-25 of Figure 21 and wherein the drive lugs contain UHMW caps.

Figure 26 shows a cross section view similar to the Figure 25 and wherein the drive lugs contain UHMW plugs molded into the drive lugs.

Figure 27 shows a section view taken from the area of the encircled section line F27 of Figure 1 to a multi-vane snow and ice agitator assembly mounted to the track guide wheels and cooperating with an adjoining exhaust chute.

DESCRIPTION OF THE PREFERRED EMBODIMENTS
With attention to the perspective view of Figure 1, an improved snowboard assembly 2 of the invention is shown. The assembly 2 provides a chassis 4 that is formed to support an upright operator. Fore and aft operator steering platforms 6 and 8 are shaped and oriented to comfortably support an operator's booted feet. The exposed surface of each platform 6 and 8 is constructed to provide a traction surface to facilitate operator steering movements. The platforms 6 and 8 can include surface knurling, granular coatings, fastened matting or other traction enhancing materials 10 that assure non-slippery contact with the platform surfaces during normal use. Straps, bindings or surfaces shaped to mate with an operator's foot ware (not shown) can also be provided at the platforms 6 and 8.

Each platform 6 and 8 is shaped and sized to accommodate independent movement of the operator's feet within the space and/or shifting of the operator's weight laterally and/or fore and aft relative to the chassis 4. The shifting of the operator's weight particularly induces a supported drive track 12 shown at Figures 2-4 and 6-12 to flex and dynamically vary the contact and contour of the track 12 with a bottom surface of a chassis or track support pan 14, reference Figure 5, of the chassis 4 and ground engaging lugs at the track 12 with the snow. Steering is thus obtained with dynamic changes in track contour upon contacting the pan 14 and the supporting snow or ice.

Steering control is particularly obtained by constructing the support pan 14 to include elongated contoured edge regions 16 (e.g. beveled, inverted V or other shapes) that bound a longitudinal recessed region 18 (e.g. defining a channel with ellipsoid, ovular or other arcuate-shaped sidewalls). The regions 16 and 18 are aligned to contact flexible surfaces of the track 12 to direct track flexion and retain the track 12 to the chassis 4 over a range of steering motions. Simultaneous variations in vehicle speed can be applied to modulate steering motions. Particular details to the construction of the contoured surfaces 16 and recess 18 and responsive flexion of the track 12 are discussed below with respect to Figures 7 through 10. One or more rails might also be provided alone or in combination with the recess 18 to limit lateral track movement and facilitate track retention.

A gasoline engine 20 (e.g. 5-10 hp) is mounted between the foot platforms 6 and 8.
The engine 20 is located relative to the platforms 6 and 8 to slightly overweight the vehicle's aft end to maintain an upward trim angle at the fore end. The risks of possible operator discharge from the vehicle 2 due to porpoising or nose-diving with a downward trim angle are thereby alleviated. A DC motor with a storage battery or other electrically powered motor or hybrid power source (e.g. gas and electric) with appropriate controls might alternatively be incorporated into the vehicle 2 in lieu of the gas engine 20.

A mechanical (e.g. cable) or electro-mechanical control linkage 22 extends from the engine 20 and is manipulated by the operator. The linkage 22 is routed along an upright support column 24 or can be held in an operator's hands. A cowling 25 protects hand controls 26 coupled to the cable 22 and fitted to the support column 24.
The column 24 also provides a degree of stabilization to the operator during steering motions.

The shape of the column 24 (e.g. tilt angle, bends, supports etc.) and coupling to the chassis 4 can be adjusted as desired to accommodate operator ergonomics and stabilize the operator. Presently, the column 24 is fastened to the chassis 4 and several alternative mounting holes are provided to permit a 15 range of tilt adjustment. The column 24 is also constructed in sections that interlock and telescope relative to one another. The adjustments collectively allow the user to establish a desired operating setup column height and pitch angle.

Although a cable 22 is presently used, a wireless, radio frequency (RF) electro-mechanical drive might also be adapted to the engine 20. In such a circumstance, an operator handheld controller 27 (shown in dashed line) might transmit RF
signals via provided actuators (e.g. button, slide or joy stick) and a transceiver to one or more electro-mechanical servos (e.g. relays, solenoids, pistons) responsively coupled to the vehicle 2 (e.g. engine throttle). Engine operation and other operating mechanisms and parameters might thereby be controlled. Other servos might be mounted to the chassis 4, for example, to vary the shape of the support pan 14, change the ground contact surface of the chassis 4 or directly interact with flexible steering surfaces to direct track flexion.

In the latter regard, one or more reciprocally mounted pads with roller(s) 29' (shown in dashed line at Figures 3 and 9) can be mounted to the chassis to bear on an appropriate interior surface(s) of the track 12 (e.g. the drive lugs) to manipulate the track and vary track flexion to induce a desired steering. The rollers 29' can exhibit different shapes (e.g. circular, elliptical) or be mounted for eccentric rotation from a supporting assembly to provide a differential contact with the track 12. The rollers 29' might also be mounted to a support frame that actively or passively moves relative to the support pan 14 to appropriately flex filamentary members at the track 12. Figures 13 through 19 disclose another steering control assembly. Control of the rollers 29' might also be actively directed with linkages that direct the rollers 29' to contact flexible portions of the track 12 with varying degrees of force at preferred track surface locations (e.g.
bordered within the track or along peripheral edges) as appropriate. Details to the construction of the track 12 and cooperation with the chassis 4 to effect steering are provided below.

The engine 20 is encased beneath a cover or safety shroud 28 to prevent operator contact with any moving parts or the exhaust system. The engine 20 is mounted to direct exhaust gases away from the operator. A hinged shroud 31 is mounted to the side of the shroud 28 and covers a clutch and drive linkage assembly 30 coupled to the track 12. The chassis 4 can include other safety features and can be formed to exhibit any desired aerodynamic and/or aesthetic shape. The chassis 4 might also be constructed to accommodate multiple operators, passengers or permit towing of sleds or accessory appliances.

With attention to Figures 2 through 5, views are shown to the drive linkage 30.
The linkage 30 includes a centrifugal clutch 32 that is mounted to an output shaft 33 of the engine 20. A drive belt 34 extends from the clutch 32 and is trained around another centrifugal clutch 36 supported to a transfer shaft 38. A belt 40 is trained from another sprocket (not shown) mounted beneath the clutch 36 to a sprocket 44 fitted to an idler shaft 46. Yet another belt 48 extends to a track drive shaft 50 and sprocket 52 mounted to the shaft 50.

A track drive sprocket 54 is centered on the shaft 50 and provides several lateral extending teeth 56 that engage upright drive lugs 58 that project from an interior surface of the track 12. Multiple drive sprockets 54 can also be fitted to the chassis 4.
Exposed ground contact lugs 59 depend from the exterior surface of the track 12 in regular rows and columns and engage the snow. The lugs 59 are constructed and positioned to direct forward motion and facilitate steering.

Separately depicted at Figure 3 is a diagrammatic view to the routing of the track 12 relative to the chassis 4. The interior surface of the track 12 is trained around the aft drive sprocket 54 and a pair of forward idler wheels 60 mounted to an idler shaft 61. The chassis support pan 14 supports the bottom of the track 12 intermediate the aft sprocket 54 and front wheel(s) 60. Several rubber coated idler wheels 51 and 53 ride on the upper surface of the track 12. The idler wheels 51 and 53 are mounted to intermediate idler shafts 55 and 57 fitted to the chassis 4. The idler wheels 51 and 53 support the track 12 to direct the track in non-contacting relation beneath the foot support platforms 6 and 8 and engine 20. The idler wheels 51, 53 and 60 are mounted to be adjustable and/or resiliently biased to maintain a relatively constant tension on the track 12. The wheels 60 can also support agitators discussed below at Figure 27 to pulverize and exhaust collected snow and ice and improve track control and vehicle performance.

With additional attention to Figure 5, the track 12 otherwise contacts and rotates over the contoured, longitudinal slide surface of the chassis or track support pan 14.
Exposed longitudinal flanges 63 and 65 of suitable contour extend along the sides of the support pan 14 and glide directly over the snow to maintain operating stability. Adjacent the flanges 63 and 65 are track contact surfaces 66 and 68 that exhibit a slight inverted V-shaped bevel when viewed end-on, reference Figures 10 and 12. The drive lug recess 18 extends the length of the support pan 14 and is centered between the track contact surfaces 66 and 67. The drive lugs 58 rotate in and are contained by the recess 18.
More details to the cooperation of the track 12 with the beveled surfaces 66 and 68 to achieve steering are discussed below with respect to Figures 9 through 12.

Mounted to the chassis 4 to engage opposite ends of the forward idler axle 61 are adjustable tensioners 72. The tensioners 72 are supported to directe the shaft 61 in a differential eccentric fashion. Upon rotating the tensioners 72 relative on the shaft 61, eccentric surfaces or an eccentric action of the tensioners 72 direct the idler wheels 60 fore or aft to vary the tension of the track 12. The tension is normally set to center the rotation of the track 12 relative to the idler wheels 60 and support pan 14.

The novel construction of the track 12 is particularly depicted at the partial plan and cross section views of Figures 6-8. The cooperation of flexible track surfaces with the support pan 14 provide steering control and maneuverability over the snowboard 2 and the details of which are shown and discussed with respect to Figures 9-12.

In this regard and returning attention to Figure 6 and in distinction to a continuous, constant width belt, the belting of the track 12 is constructed with a number of lateral notches, gaps or slots 76 formed into the left and right sides or peripheral edges of the track 12. The slots 76 presently extend from the peripheral track edges approximately one-third the width of the track width and terminate at a central band 78. The slots 76 define filamentary members or lateral fringe pieces 80 that extend from the sides of the center band 78 along a longitudinal center axis "A" and laterally radiate parallel to transverse track axes "B". Smooth interior surfaces 82 of the fringe pieces 80 engage the support pan surfaces 66 and 68. Although the slots 76 are shown open ended, the slots 76 may be closed ended; that is, the filamentary members 80 may be bordered or circumscribed by surrounding portions of the track 12 A series of laterally displaced drive lugs 58 project from the interior surface of the band 78 and engage the sprocket teeth 56 and pass through the central portion of the support pan 14 and the recess 18, reference Figures 7 and 8. Rows of the ground engaging drive lugs 59 depend from the opposite, exterior side of the band 78 and the fringe pieces 80. The drive lugs 59 are shaped and arranged to optimize forward travel.

The drive lugs 59 are organized into alternating rows 82 and 84 of lugs 86 and that span the track 12 and exhibit shapes designed to optimize vehicle performance over snow. The rows 82 each provide a single lug 86 that approximately spans the width of the center band 78. The lugs 86 depend from the track 12 between the overlying drive lugs 58. Each lug 86 provides an upright center piece 88 having a center recess 89.
End pieces 90 extend at obtuse angles from opposite ends of the center piece 88. Leading and lagging surfaces (relative to the track travel direction) of the lug pieces 88 project from a relatively wide base at the track surface to a narrow elevated apex 91. The lugs 86 thereby exhibit an elongated, inverted V-shape relative to the rotational travel direction of the track 12.
The alternating rows 84 separately provide lugs 92 that span both the center region 78 and the fringe pieces 80. The rows 84 extend beneath the drive lugs 58.
Each lug 92 is constructed of a trapezoid-shaped center piece 94 and laterally displaced end pieces 96.
The center and end pieces 94 and 96 are coupled together with straight, upright web pieces 98.

The end pieces 96 extend the width of the fringe pieces 80 at the rows 84. The end pieces 96 include short horizontal sections 100 and longer end steering sections 102 that extend at obtuse angles from the horizontal sections 100. The lug and web pieces 96 and 98 project from a relatively wide base at the track surface to a narrow apex 104. The center piece 94 rises to an apex 106 approximately twice the width of the apex 104.

The lugs 92 also exhibit an elongated, inverted V-shape relative to the rotational travel direction of the track 12. Rotation of the center pieces 94 overlaps the regions of ground contact of the lugs 86 and movement of the fringe pieces 80 and particularly the end sections 102 provides steering control.

In the latter regard and with attention to Figures 9 through 12, vehicle steering is achieved by dynamically varying the contact of the smooth interior surfaces 82 of the fringe pieces 80 with the beveled support pan surfaces 66 and 68. Figures 9 and 10 depict a straight line condition wherein the operator's weight is centered on the chassis 4 with the support pan 14 generally riding horizontal to the ground. The fringe pieces 80 shown without the steering lugs 102 are correspondingly centered over the support pan 14.
Steering is achieved by varying the operator's position and/or weight on the foot pads 6 and 8 to change the contact dynamics of the track 12 and particularly the fringe portions 80 with the support pan 14. For example, as the operator applies weight to the left side of the chassis 4 and with attention to Figures 11 and 12, the support pan 14 tilts and the track 12 slides along the pan 14. The left side of the track 12 engages the snow, the left fringe pieces 80 collapse or compress inward against themselves at the slots 76 as they contact the beveled surface 66. The compression of the left side of the track 12 causes the left side to cup and which action exaggerates the gripping action of the left side lugs 102 with the snow. The drive lugs 58 correspondingly move to the right in the recess 18 and which motion is limited upon contact with the sidewalls of the recess 18.

The respective slots and fringe pieces 76 and 80 at the right side of the track 12 independently diverge and the right side track interior surface 82 rotates with limited contact with the beveled surface 68. The vehicle 2 responds to the opposing compression and expansion of the fringe pieces 80 at the slots 76 to turn left or right.
The simultaneous gripping of the snow by the left side steering lugs 102 enhances the responsiveness of the vehicle 2 to turn.

In a similar fashion, the controlled application of force on the drive lugs 58 to laterally direct the fringe pieces 76 and 80 via the rollers 29' shown in dashed line at Figures 9 and 12 can produce directional steering flexion. The flexion can be derived by depressing one side of the rollers 29' and/or elevating the other side to manipulate the drive lugs 58 and the fringe members 80. The axles 25 can be manipulated in different fashions similar to shifting an operator's weight to derive appropriate track contact.
Additional rollers 29" can also be mounted at the ends of the recess 18 to re-center the track 12 relative to the drive sprocket 54 and/or idler rollers 60.

Also shown at Figure 9 in dashed line is a sliding assembly wherein rollers 29' and axles 25 are mounted to "L" brackets 110 that span a widened cutout region 112 in the pan 14. The brackets 110 are mounted to permit the rollers 29' to laterally slide to and fro to selectively engage the drive lugs 58 to direct the fringe members 80. Contact of the drive lugs 58 with the recess 18 or other pan surfaces limit lateral track movement.
Stops (not shown) may also be fitted to the pan 14 to engage the brackets 110. The brackets 110, rollers 29' and/or axles 25 can be mounted for operator directed movement or externally directed movement with an appropriate externally operated actuator and linkage.

An alternative, presently preferred chassis pan/slide roller assembly 200 is shown in detail at Figures 13 through 19. The assembly 200 can be interchangeably mounted to the chassis 4 in lieu of the chassis support pan 14. The assembly 200 is used with a further improved track 230 having pleats 202 formed into the track 12 in lieu of slits 76. The assembly 200 can also be used with a track 12 having fringe members 80 in the fashion of the brackets 110 and rollers 29'. Views to the improved track 230 are depicted at Figures 20 through 26.

The assembly 200 provides a bent, elongated pan or plate 204 that substantially covers the bottom of the chassis 4 in the space between the drive sprocket 54 and idler wheels 60 and exhibits a beveled, inverted V-shape when viewed end on, reference Figures 16-19. The plate 204 mounts to the chassis 4 in lieu of the chassis support pan 14.

The assembly 200 serves the same general function as the chassis support pan 14, recess 8 and beveled edges 66 and 68.

Fore and aft guide wheel assemblies 206 and 208 are supported to the ends of the plate 204 as shown in Figures 13 through 17. The guide wheel assemblies 206 and 208 each provide a pair of domed plastic and/or rubber coated wheels 210. The wheels 210 are supported from a straight axle 212 that extends between right and left axle brackets 214.
The brackets 214 are fastened to the plate 204 at openings 215. The wheels 210 contact the interior surface of the track 4 and align with the sides of the drive lugs 242 as the lugs 242 pass over the ends of the pan 204 to maintain the track alignment and prevent disengagement of the track 230 from the chassis 4.

Mounted between the center guide wheel assemblies 206 and 208 approximately midway along the plate 204 and shown in detail at Figures 13, 14 and 17-19 is a track steering assembly 220. The steering assembly 220 supports three paired sets of track flexion wheels 222. Each pair of wheels 222 is supported to a bent, inverted V-shaped axle 224, reference Figure 19, that extends between right and left axle brackets 226. The steering assembly operates in the longitudinal space between the guide wheels 210.

The axles 224 are formed to align the wheels 222 relative to the brackets 226 and plate 204 to contact the drive lugs 242 and laterally direct the pleats 202 formed into the peripheral edges of the track 230. The axles 224 align the wheels 222 slightly offset (e.g.
in a range of 15 to 25 ) from being orthogonal to the plate 204. The domed or arcuate sides of the wheels 222 thereby maintain efficient contact with the track 230 and lugs 242 as they ride over the track 230. The ends of the axles 224 are secured to the brackets 226 with couplers 228 that contain spherical bearings 229. The couplers 228 and bearings 229 permit the axles 224 and wheels 222 to float or wobble as they contact the track 230.

Although a particular axle 224 and coupler 228 have been shown, axles 224 of other shapes and cooperating with other couplers or connecting linkages can be used to obtain ,= ~

other floating assemblies with multiple axes of movement at the wheels 222.

The axle brackets 226 are retained to the lateral sides of a center aperture formed into the plate 204. The brackets 226 are mounted in a fashion that permits a side-to-side reciprocating movement of the brackets 226. The movement is achieved with a retainer plate 234, high density slide bearings 235 (e.g. UHMW plastic) and bushings or spacers 236 that surround fasteners 237 used to capture the brackets 226, plates 234 and bearings 235 to slots 239 formed into the plate 204 adjacent the ends of the aperture 232.

The bearings 235 and bushings 236 permit the brackets 226 and wheels 222 to freely slide to and fro relative to the aperture 232 independent of the freedom of movement of the brackets 226 and the spherical couplers 228. The wheels 222 are thus able to slide along the pan 204 and tilt or wobble and move laterally to accommodate operator steering motions. The combination mounting of the wheels 222 provides a firm grip of the track 230 and drive lugs 242, yet permits the wheels 222 to tilt and move as they encounter the lugs 242 and laterally direct the pleats 202 over the beveled surfaces of the pan 204 to flex and flatten the pleats 202. As one side of the pleats 202 flatten and expand with increased ground contact, the opposite side pleats relax and contract. The changing contour of the track 230 thus responds in a similar fashion to the fringed track 12 as shown at Figures 10 through 12 and varies the track's grip with the snow to steer the vehicle.

Figures 15 and 16 further depict a plate or tray 225 (shown in dashed line) that can be fitted to the chassis 4 to prevent and/or minimize the collection of snow and ice between the chassis 4 and the support pan 204. The tray 225 particularly fastens to the support plate 204 and is positioned to direct snow that enters the apertures 215 and/or 232 forward with movement of the drive lugs 242 and raised slide surfaces 250 that are described in detail below. The surfaces 250 contain thermo formed UHMW track stiffener members 246 that are located and exposed at the interior surface of the track 230 to reduce the friction between the track 230 and the support pan 204. .

Details to the particular construction of the improved track 230 are shown at Figures 20 through 25 wherein respective perspective, top, side and end views of the track 230 are shown. Figure 20 depicts a sectional perspective view of the interior surface of the track 12 and several seriatim pleats 202 and adjacent surfaces 231. Each pleat 202 rises and extends to an adjoining peripheral track edge at an acute angle in the range of 5 to 20 degrees and projects approximately %2 to 1 inch from the bottom of the track 230 at its maximum height. The wall thickness (e.g. 1/8 to 3/16 inch) and construction of each pleat 202 is sized and formed to promote flexion as the wheels 222 contact the lugs 242 and direct the track 230 left and right. The pleats 202, in turn, expand and contract as they move over the beveled or ramped surfaces of the support pan 204. As the wheels move laterally and run against the drive lugs 242, the pleats 202 engage the beveled surfaces of the support pan 204, flatten and expand or relax and contract in relation to the degree of contact with the support pan 204.

Each pleat 202 rises to a ridged apex 201 or hinge where each pleat 202 expands and contracts as the wheels 222 slide laterally direct the pleats 202 relative to the contours of the support pan 204 to flex and expand or relax and contract. Relief channels 233 are formed into the interconnecting junctions of the sidewall webs of each pleat 202 with the bottom surface of the track 12 to similarly promote flexion of the pleats 202.
Flexion of the pleats 202 can also be enhanced by providing apertures or recesses 251 (shown in dashed line) in the track 230 at the apex of the V of each pleat 202. The size and shape of the apertures 251 can be established as desired. The apertures 251 also exhaust snow from the interior of the track 230 that collects above the tray 225. The foregoing details can be seen along with the relative locations of the pleats 202, ground gripping lugs 238 and 240, and drive lugs 242 and related improvements thereto at Figures 21 through 26 Although V-shaped pleats 202 are shown, other raised or flexible shaped track surfaces can be incorporated into the track 230. The pleats 202 or other flexible members can be transversely aligned to extend at any desired angular orientation to a longitudinal center axis of the track 230, although presently extend at an acute angle or orthogonal to the longitudinal track axis. The flexible surfaces can be located along the peripheral edges or can be located so they are circumscribed by adjoining portions of the track to cooperate with mating chassis surfaces or assemblies supported to the chassis 4. The flexible surfaces desirably should direct the flexible portions of the track 230 to expand and contract at opposing regions to promote steering changes.

With attention to Figures 24 through 26 additional details are shown to improvements to the lugs of the track 230. Projecting from the bottom, ground engaging surface of the track 230 and coaxially aligned with the pleats 202 are a series of centered, ground gripping lugs 238. Longitudinally offset from the lugs 238 and depending opposite the raised surfaces 250 are elongated steering lugs 240 that span the width of the track 230. The lugs 240 include recessed cavities 248 designed and located to enhance the gripping characteristics of the track 230. The shapes and locations of the cavities 248 can be varied as desired. The present cavities 248 overly the raised surfaces 250 at the track interior and the thermo formed track stiffeners 246 that are molded into the track 230.

As the cavities 248 are formed in a track mold, UHMW stiffener members 246 previously supported in the mold and/or to the track blank are contemporaneously bonded to the track 12 and formed to a shape to enhance track cooperation with the support pan 204. The members 246 are particularly mounted to a partially formed track blank that is wrapped and wound with suitable belting, cording etc. The stiffener members 246 are located to align with cavities in a track mold and presently span the track blank to collinearly align the stiffener members 246 to the ultimately formed steering lugs 240.
With several iterative engagements of the mold at a suitable pressure and temperature, the rubber and UHMW material at the track blank flow and/or bend to mold the track 230 to the depicted shape.

The drive lugs 242 are coaxially aligned with raised surfaces 250 and stiffeners 246 that engage the support pan 204. The raised surfaces 250 are described in detail below but contain thermo formed UHMW track stiffener members 246 that are located to reduce the friction between the track 230 and the support pan 204.

As the track blank is molded, portions of the mold are depressed into the steering lugs 240 to form the cavities 248 in the ends of the lugs 240. The heated stiffener members 246 are contemporaneously depressed and bent to define raised surfaces 250.
The depressed cavities 248 thus improve traction at the exterior ground gripping track surface and reduce friction at interior raised surfaces 250 which slide over the support pan 204 with reduced friction. The track wear and durability is thereby improved.

During construction of the track 230, caps 244 constructed of UHMW plastic or other high density material exhibiting relatively low friction relative to the support pan 204 can be positioned in the mold to align with the portions molded to define the drive lugs 242. The caps 244 can also be separately fastened or bonded to the lugs 242 after molding, before or after the track 230 has cooled. As the track material flows, the raised drive lugs 242 are formed and the caps 244 are thermally bonded to the drive lugs 242.
Alternatively, the caps 230 and 244 can be pressed or threaded into reduced size cavities.
The capped drive lugs 242 provide enhanced track durability and reduced friction and wear with the sprocket 54 and between the track 230 and support pan 204.
Alternatively, UHMW plugs 245 shown at 26 can be bonded, thermo formed or fitted to the lugs during or after the molding of the track 230.

Figures 15 and 16 also depict a snow deflection or diverter pan 225 that can be made of metal or plastic that cooperates with the chassis pan 204 to control or minimize the collection of snow and/or ice at the pan 204 and in the spaces surrounding the apertures 215 and 232. Any snow entering the apertures 215 and 232 collects above the pan 225 and is directed forward from an aft flange 227 due to the rotating action of the drive lugs 242 and raised surfaces 250 along the pan 225. The snow is directed to a discharge or exhaust port 260 shown at Figure 27 where the snow is ejected.
The snow is also ejected through the apertures 251 in the track 230.

Figure 27 depicts a section view to a further improvement to the chassis assembly 4 that is taken at the encircled section line F27 of Figure 1. A snow and ice agitator assembly 262 is particularly shown that mounts either to the idler wheels 60 or adjacent to the wheels 60 along the idler axle 61. Agitator vanes 264 are mounted to rotate and contact snow inside the chassis 4 or that is diverted via the shield 225 to beat and break up any ice particles. The pulverized material is directed to the exhaust chute 260.

Presently, several vaned agitators 264 are mounted to the rims of the idler wheels 60. The vanes 264 are located and shaped to breakup ice and crusted snow and direct the debris into the discharge port or exhaust chute 260 and away from the chassis 4. The exhaust chute 260 is sized and shaped to prevent clogging and direct the debris away and without hindering operation of the snowboard 2.

Although one construction and mounting of an agitator assembly 262 is shown, the agitators 264 can be constructed to different shapes and/or be located elsewhere relative to the support pan 204 and track 230 to promote steering (e.g. the drive sprocket 54). The agitators 264 can also include apertures at the vanes 264 and/or the edges can be shaped differently and/or include other surface shapes conducive to optimizing the breakup of encountered chunks of crusted snow and ice before the pulverized debris is exhausted.

While the invention has been described with respect to a presently preferred assembly and considered improvements, modifications and/or alternatives thereto, still other assemblies and arrangements may be suggested to those skilled in the art. It is also to be appreciated that the features of the foregoing chassis, frame and track can be arranged in different combinations. For example, the track might be included with a different chassis configuration; the bottom contour of the support pan may be configured differently; a different track drive assembly may be coupled to the track;
and/or the drive and/or ground contact lugs at the track and/or the slots between flexible filamentary members or pleats can be configured differently. The diverter pan and/or the agitator can also be used with other snow vehicles or provided in different snowboard combinations.
The foregoing description should therefore be construed to include all those embodiments within the spirit and scope of the following claims.

Claims (34)

1. A motorized vehicle comprising:

a) a chassis supporting an engine and an endless track and having an operator platform;

b) a framework mounted to said chassis including a drive sprocket coupled to said engine and a plurality of idler wheels and wherein said track is trained around said sprocket and idler wheels; and c) wherein said endless track includes a longitudinal rigid portion and a flexible portion, wherein said flexible portion comprises a plurality of seriatim flexible members adjacent said rigid portion that longitudinally expand and contract to vary the contour of said track when placed under pressure, wherein drive lugs project from an interior surface of said center portion to engage said drive sprocket, wherein a plurality of ground engaging lugs transversely span and depend from external surfaces of said rigid and flexible portions, and wherein said flexible members are located to contact said chassis and flex with operator movements to vary the track contour and steer said vehicle.

2. A vehicle as set forth in claim 1 wherein a bottom surface of said chassis contacting said flexible portion is contoured to induce pressure on said flexible portion.

3. A vehicle as set forth in claim 1 wherein said first portion comprises a center portion of the track and wherein said flexible portion comprises rigid and second pleated portions containing a plurality of pleats that respectively extend and rise at an acute angle from opposite lateral sides of said center portion toward longitudinal peripheral edges of said track.

4. A vehicle as set forth in claim 3 wherein said pleats comprise compound raised V-shaped ridges that transversely extend from an apex and progressively rise as they extend to the peripheral edges of said track.

5. A vehicle as set forth in claim 4 wherein said pleats extend orthogonal to a longitudinal center axis of said track and wherein said track includes an aperture at the apex of each pleat.

6. A vehicle as set forth in claim 3 a bottom surface of said chassis exhibits beveled longitudinal surfaces that engage said first and second pleated portions to flex the pleats with operator movement.

7. A vehicle as set forth in claim 6 wherein the beveled surfaces define a V-shape when the vehicle is viewed end on.

8. A vehicle as set forth in claim 6 wherein said bottom surface includes a longitudinal recess centered between adjoining lateral beveled surfaces and wherein said drive lugs are restrained to pass along said recess.

9. A vehicle as set forth in claim 8 wherein longitudinal sidewalls of said recess exhibit an arcuate shape.

10. A vehicle as set forth in claim 3 wherein the pleats of said first and second pleated portions orthogonally extend opposite each other along parallel axes transverse to a longitudinal center axis of said track and wherein ground engaging lugs substantially span the width of and depend from said track fore and aft of each pair of said pleats.

11. A vehicle as set forth in claim 10 wherein said ground engaging lugs include recessed cavities.

12. A vehicle as set forth in claim 11 wherein said track includes a plurality of stiffener members mounted to transversely span said track, wherein a stiffener member coaxially overlies each ground engaging lug, wherein each stiffener exhibits a bent portion overlying each recessed cavity, and wherein the bent portions of said stiffeners are defined at raised interior surfaces of said track.

13. A vehicle as set forth in claim 3 wherein said chassis supports a member mounted to move independent of the vehicle and containing a plurality of steering rollers, and wherein operator movement directs said steering rollers to direct the track to flex said pleats and vary the track contour.

14. A vehicle as set forth in claim 13 wherein the roller support member is mounted for reciprocating lateral movement, wherein said plurality of rollers comprise a plurality wheels secured to a plurality of axles and that project from said member, and wherein said wheels are independently supported to tilt relative to a support axle.

15. A vehicle as set forth in claim 1 wherein said chassis includes first and second foot rest platforms and a rigid stanchion that supports vehicle controls.

16. A vehicle as set forth in claim 1 wherein said chassis supports a member mounted to move independent of the vehicle to contact and flex said flexible members to vary the track contour and thereby provide steering control.

17. A vehicle as set forth in claim 1 wherein said track includes a plurality of lugs having UHMW members attached thereto.

18. A vehicle as set forth in claim 1 wherein said framework includes a diverter member mounted to direct snow and ice collecting within the framework away from the vehicle.

19. A vehicle as set forth in claim 1 wherein said framework includes rotating vanes mounted to pulverize snow and ice collecting within the framework and an exhaust port for directing the pulverized debris away from the vehicle.

20. A motorized vehicle comprising:

a) a chassis supporting an engine and an endless track and having an operator platform and wherein a bottom surface of said chassis includes a contoured longitudinal pan;

b) a framework mounted to said chassis including a drive sprocket coupled to said engine and a plurality of idler wheels and wherein said track is trained around said sprocket and idler wheels; and c) wherein said endless track includes a longitudinal center portion and adjoining first and second pleated portions, wherein said first and second pleated portions respectively comprise a plurality of pleats that transversely extend and rise along opposed lateral sides of said center portion toward longitudinal peripheral edges of said track, wherein drive lugs project from an interior surface of said center portion to engage said drive sprocket, wherein a plurality of ground engaging lugs transversely span and depend from external surfaces of said track, and wherein said pleats are mounted to contact said chassis pan with operator movements to flex and vary the track contour and thereby steer said vehicle.

21. A vehicle as set forth in claim 20 wherein said pleats extend from said peripheral edges opposite each other along common parallel axes orthogonal to a longitudinal center axis of said track and wherein said ground engaging lugs depend from said track between each pair of opposed pleats.

22. A vehicle as set forth in claim 20 wherein said pleats comprise compound raised V-shaped ridges that transversely extend from an apex and progressively rise at an acute angle as they extend to the peripheral edges of said track.

23. A vehicle as set forth in claim 22 wherein said pleats extend orthogonal to a longitudinal center axis of said track and wherein said track includes an aperture at the apex of each pleat.

24. A vehicle as set forth in claim 20 wherein a member is mounted to said chassis pan for reciprocating lateral movement, wherein said member supports a plurality of wheels secured to a plurality of axles that project from said member, and wherein said wheels are independently supported to tilt relative to each support axle.

25. A vehicle as set forth in claim 24 wherein said member is supported on a plurality of hemispherical bearing surfaces.

26. A motorized vehicle comprising:

a) a chassis supporting an engine and an endless track and having an operator platform, wherein a bottom surface of said chassis includes a contoured longitudinal pan wherein a member is mounted to said chassis pan for reciprocating lateral movement, and wherein said member supports a plurality of wheels secured to a plurality of axles that project from said member;

b) a framework mounted to said chassis including a drive sprocket coupled to said engine and a plurality of idler wheels and wherein said track is trained around said sprocket and idler wheels; and c) wherein said endless track includes a longitudinal center portion and adjoining first and second pleated portions, wherein said first and second pleated portions respectively comprise a plurality of pleats that transversely extend from opposed lateral sides of said center portion toward longitudinal peripheral edges of said track, wherein said pleats comprise compound raised V-shaped ridges that transversely extend from an apex and progressively rise as they extend to the peripheral edges of said track, wherein drive lugs project from an interior surface of said center portion to engage said drive sprocket, wherein a plurality of ground engaging lugs transversely span and depend from external surfaces of said track, and wherein said pleats are mounted to contact said wheels to flex with operator movements to vary the track contour and thereby steer said vehicle.

27. A vehicle as set forth in claim 26 wherein said pleats extend from said peripheral edges opposite each other along common parallel axes orthogonal to a longitudinal center axis of said track, wherein said ground engaging lugs depend from said track between each pair of opposed pleats, and wherein said ground engaging lugs each include a plurality of recessed cavities.

28. A vehicle as set forth in claim 27 wherein said track includes a plurality of stiffener members mounted to transversely span said track, wherein a stiffener member coaxially overlies each ground engaging lug, wherein each stiffener exhibits a bent portion overlying each recessed cavity, and wherein the bent portions of said stiffeners are defined at raised interior surfaces of said track that interact with said wheels.

29. A vehicle as set forth in claim 26 wherein said track includes a plurality of lugs having UHMW members attached thereto.

30. A vehicle as set forth in claim 26 wherein an aperture is defined in said track at the apex of each of said pleats and wherein said wheels are independently supported to tilt relative to each support axle.

31. A vehicle as set forth in claim 26 wherein said member is supported on a plurality of hemispherical bearing surfaces.

32. A method for constructing an endless track comprising the steps of:

a) forming a track blank from a plurality of layers of elastomeric material, a plurality of wraps of cordage materials, and a plurality of elongated UHMW
members mounted to said track blank;

b) preheating a track mold containing a cavity to support said track blank and including a plurality of cavities to support said UHMW members; and c) engaging said mold to close over said track blank to compress said mold and raise the temperature to cause said elastomeric material to flow and form a track containing a plurality of lugs having a plurality of recesses and to deform and bend said UHMW members to define horizontally offset portions aligned to the lug recesses.

33. A method as set forth in claim 32 including the steps of mounting a plurality of UHMW lug pieces to a plurality of lug cavities in said mold and thermally affixing said lug pieces to said lugs.

34. A method as set forth in claim 32 wherein said mold includes a plurality of cavities that define compound raised V-shaped pleats that project from said track, wherein recesses are formed at the intersection of web pieces of the pleats that rise and intersect at a ridge coextensive with each pleat, and wherein an aperture is defined in said track at an apex of each of said pleats.