Abstract: Mud and sand are prevented from entering between support-receiving members since both ends of the roller shaft are constructed so as to be held at both sides thereof when providing the upper roller on the travelling body frame secured in a civil engineering apparatus. The first and second support receiving members 19, 20 are constructed so that the members respectively support both end portions of the roller shaft 17a of the upper roller 17 on the upper part of the track frame 11 and cross frame 12 on the travelling body frame 10 secured at the lower part of the civil engineering apparatus, wherein the roller supporting portions 19a, 20b and a pair of coupling pieces 19a, 20a for coupling the roller supporting portions 19b, 20b to the travelling body frame 10 are formed to be substantially reverse U-shaped.

Abstract: A control system for a small work vehicle such as a compact track propelled loader has a control handle that is mounted onto a swinging support plate. The support plate swings about a vertical axis positioned forwardly of the control handle, and the control handle is mounted on the support plate about a horizontal axis. Linkages are provided between the control handle and the pivotal mounting about the upright axis to respective motor control levers for operating motors on opposite sides of the vehicle for steering and propelling the vehicle. Moving the control handle about the horizontal axis causes a drive selectively in forward and reverse direction, and moving the support plate and the control handle about the vertical axis provides differential movement for steering control.

Abstract: An apparatus comprises a body having a torus skin with inner and outer layers, and a drive system configured to propel the apparatus by moving the inner layer relative to the outer layer. The active skin propulsion system allows movement and steering of a device. A drive system includes a plurality of drive segments coupled together so that the skin engaging unit of the drive segment frictionally moves the inner layer of the torus skin relative to the outer layer of the torus skin. As a result of the relative skin motion and contact with the surface by the outer layer of the torus skin, the body is propelled and may be steered.

Abstract: A tandem track system and method provides for safe withdrawal of a tracked vehicle if either of the main tracks becomes separated. The tracked vehicle has a main track longitudinally extending in a closed endless main loop on opposite sides and engaging a separate main drive sprocket assembly, extending under roadwheels to a main drive idler wheel, and back to the main drive-sprocket assembly in the main loop. The tandem drive system has a secondary track engaging each main drive-sprocket assembly and extending forward along the track vehicle from each main drive-sprocket assembly under only an aft-most fractional portion of the roadwheels. The secondary track is configured as a closed endless secondary loop inside of the main loop of each main track whereby each secondary track can transfer rotary power to move the tracked vehicle to safety.

Abstract: A crawler vehicle having a lower works comprising a carbody and a pair of crawler assemblies. Each of the crawler assemblies are removably connected to the carbody by a plurality of carbody to crawler connections. The carbody to crawler connection each comprise at least one keyway for aligning the connection components of the crawler assembly with the connection components of the carbody, and for preventing these connection components from becoming misaligned in response to eccentric forces or deflections generated between the carbody and each of the crawler assemblies.

Abstract: An all-terrain vehicle is supported and driven by endless track units. Each track unit includes a drive belt with rows of interior drive lugs driven by cogs on multiple sprocket wheels of a common drive wheel assembly having an integrated, one-piece drum and hub. Multiple guide wheel assemblies engaging the lower run of the drive belt distribute the vehicle load across substantially the full width of the belt. Each guide wheel assembly includes a pair of guide wheel units mounted on opposite end portions of a common spindle and on opposite sides of a carrier beam of the track unit. Each guide wheel unit has a wide belt-engaging surface extending to, or close to, an edge portion of the belt and interrupted by an annular groove permitting passage of a row of the belt drive lugs while maintaining alignment of the belt and drive wheel assembly.

Abstract: A mobile ice fishing shelter assembly for permitting quick and easy movement of a mobile shelter designed to facilitate ice fishing. The mobile ice fishing shelter assembly is positionable on a vehicle having a seat portion and a drive assembly, and may comprise a shelter assembly for coupling to the vehicle. The cover assembly is adjustable between a retracted position and a deployed position. The seat portion may include at least one pivotable seat member for adjusting a position of a user to selectively facilitate driving the vehicle and fishing to a side of the vehicle while seated on the seat portion.

Abstract: A track drive undercarriage device, a kit for the device, and a method of using the same are described attached to a chassis of a heavy construction work vehicle for operationally connected to a transmission and drive shaft of the construction vehicle. The device is operationally attached to the vehicle for providing increased the traction and stability of the heavy construction work vehicle when maneuvering the vehicle off-road. The device includes the interconnected elements of: a pair of support braces, a base plate, four shock absorbers, four axles, a pair of torque bars, and four spindles. The kit includes the unconnected components of the device. The method of using includes the steps of acquiring, adjoining, affixing, connecting, joining, obtaining, procuring, receiving, securing, and wrapping.

Abstract: An endless track assembly wherein the weight of an associated vehicle/equipment is supported by the track framework. The track assembly provides a framework having a number of idler rollers and a drive sprocket that mounts to a rotational drive power source. The weight of the vehicle is transferred from a vehicle/equipment support flange that cooperates with a complementary support surface of the track framework and an intermediate bearing liner. The bearing support surfaces cooperate to permit the track frame to pivot relative to the chassis independent of the drive sprocket. The track assembly is particularly adapted to pivoting irrigation systems.

Abstract: A hydraulically driven traveling vehicle comprising a pair of right and left driving axles (driving sprockets) differentially connected to each other by a differential mechanism, the input section of the differential mechanism having the output rotation of traveling HST 110 (110) transmitted thereto, both driving sprockets having mutually opposite two-flow output rotations separately transmitted thereto from a steering HST (120), thereby effecting traveling driving and turning, electromagnetic solenoids (61a, 61b, 62a, 62b) serving as output regulating devices for the traveling HST and the steering HST being provided so that the manipulated variables and directions of a speed change lever and a steering operation tool are converted into electric signals, on the basis of which electric signals the output current values of the electromagnetic solenoids are controlled, causing the respective output rotary speeds of the HSTs to correspond to the output current values.

Abstract: Disclosed is a snowmobile including reduction drive including a planetary gear system having a shaft with a sun gear, a plurality of planetary gears spaced around the sun gear and engaging a ring gear. A second shaft is driven by said planetary gears or ring gear.

Abstract: A protective firefighting vehicle comprising a chassis conceived for heavy loads, a driving gear for rough terrain and a tank mounted on the chassis for receiving liquids such as water or fire-extinguishing agents or the like. The tank is divided in at least two chambers via at least one bulkhead-like partition. Provision is made in this connection that at least one of the chambers of the tank can be sealed off in a liquid-tight manner against at least one other chamber of the tank in order to permit the transport of persons in the at least one sealable chamber.

Abstract: A half-track multi-use vehicle having an independent suspension system that reduces body roll during operation in rough or sloping terrain. The vehicle includes a frame, a pair of beams that each holds mid and rear wheels, and a suspension system extending between the each beam and the frame. The suspension system includes a plurality of cushions and a stabilizer bar. The stabilizer bar is secured to each beam at a predetermined position between the mid and rear wheels. The predetermined position is selected such that each wheel's wheel rate, which is the combined spring rate contributed by an associated cushion and the stabilizer bar, is equal.

Abstract: A crawler crane having identical left and right crawler assemblies. The left and right crawler assemblies each comprise an identical crawler drive assembly to power the individual crawlers. Each crawler drive assembly comprises a hydraulic drive motor connected to the crawler. Both crawler drive assemblies utilize identical mounting configurations for connecting the hydraulic drive motor to the frame of the crawler.

Abstract: A track vehicle employing a rail track system attached to the sides of the frame of a track vehicle having a continuous track driven by pneumatic tires mounted to the frame proximate each end of the rail system along such that triangular torsion and compression links are mounted to the continuous track such that the apex end slides along the rail and the other ends extending against the track to provides lighter more even ground contact for use on snow and other soft terrain than present track vehicles.

Abstract: Disclosed are systems and related methods for mounting a ground-engaging motive device, such as a crawler track assembly, to a vehicle, such as a crane or the like, in either an extended or a retracted position. The systems and methods are adapted to ensure that proper alignment is reliably achieved between the mounting structures on the motive device and the corresponding mounting structures on the vehicle in both the extended and retracted positions. In one embodiment, the system and method are especially adapted for use in extending the crawler track assemblies on certain types of existing cranes without the need for extensive retrofitting.

Abstract: A half-track all-terrain vehicle having an independent suspension system that provides an improved vehicle ride and facilitates traversing obstacles. The vehicle includes a frame, a pair of beams that each holds front and rear wheels, and a suspension system extending between the each beam and the frame. The suspension system includes a plurality of cushions. The cushions are tuned such that forward cushions have a relatively greater suspension stroke than the rearward cushions and thereby permit the front wheels to engage the ground sequentially before the rear wheels when the vehicle goes over a step or drop off. The suspension system is further tuned to permit the vehicle to traverse an obstacle having a height that is slightly lower than the frame clearance by permitting the front wheels to lift vertically to a distance essentially equal to the frame clearance.

Abstract: A crawler vehicle has a frame extending along a longitudinal axis of the vehicle, and two lateral track carriages oscillating with respect to the frame about a rear transverse axis. Each carriage is connected to a front cross member by a respective connecting assembly having a pin, which permits relative oscillation of the cross member and the carriage about a hinge axis perpendicular to the rear transverse axis, and has an eccentric portion for varying the effective length of the cross member between two given values as the carriages oscillate about the rear transverse axis.

Abstract: A vehicle drive system includes a hybrid wheel and track system, having a drive wheel operably coupled to a motive source, the motive source for imparting rotational motion to the drive wheel, the drive wheel having an axis of rotation, an idler wheel displaced from the drive wheel and rotationally coupled to the drive wheel by a continuous track; and a cantilever beam supporting the idler wheel and being rotatable as desired about the drive wheel axis of rotation. A device and method for controlling a suspension are further included.

Abstract: An articulated tracked vehicle that has a main section, which includes a main frame, and a forward section. The main frame has two sides and a front end, and includes a pair of parallel main tracks. Each main track includes a flexible continuous belt coupled to a corresponding side of the main frame. The forward section includes an elongated arm. One end of the arm is pivotally coupled to the main frame near the forward end of the main frame about a transverse axis that is generally perpendicular to the sides of the main frame. The arm has a length sufficiently long to allow the forward section to extend below the main section in at least some degrees of rotation of the arm, and a length shorter than the length of the main section. The center of mass of the main section is located forward of the rearmost point reached by the end of the arm in its pivoting about the transverse axis.

Abstract: A track drive system for a mobile irrigation system adapts to either centrally pivoted circular or linear mobile systems, as desired. A first embodiment has a single drive wheel with opposed first and second end guide wheels, surrounded by a single narrow track. A single drive motor and gear reduction drive, drives the central wheel. The central wheel is of considerably larger diameter than the two end guide wheels, and simultaneously contacts the track with both its upper and lower peripheries at all times. The mechanism is articulated to allow independent wheel movement relative to one another, thus providing better traction over uneven surfaces. The central drive wheel is always in contact with both the upper and lower track portion to provide continuous drive traction for the device. A second embodiment includes additional idler wheels between the two end wheels and the central drive wheel.

Abstract: A patient support including a propulsion device for moving the patient support. The patient support includes a propulsion system having a propulsion device operably coupled to an input system. The input system controls the speed and direction of the propulsion device such that a caregiver can direct the patient support to a desired location.

Abstract: A patient support including a propulsion device for moving the patient support. The patient support includes a propulsion system having a propulsion device operably coupled to an input system. The input system controls the speed and direction of the propulsion device such that a caregiver can direct the patient support to a desired location.

Abstract: Disclosed is a snowmobile including a reduction drive system including planetary gears. In an alternate embodiment, a reversing unit is provided. In a further alternate embodiment, an offset is provided in the drive system.

Abstract: A snowmobile has an engine with a compact arrangement that includes a crankshaft, an output shaft, and an auxiliary shaft. The crankshaft extends along a first axis, the output shaft extends along a second axis, and the auxiliary shaft extends along a third axis. Two of the first axis, the second axis, and the third axis are disposed in a common plane. The other of the first axis, the second axis, and the third axis is offset from the common plane.

Abstract: The invention is directed to providing a frame structure of a crawler type construction machine vehicle facilitating a degree of freedom of reforming in accordance with a variation of vehicle kind. The frame structure is capable of setting a vehicle body gravitational center position to an optimum portion by use of an upper vehicle frame at an arbitrary position that is capable of strengthening total rigidity by an integrated structure. The frame structure has left and right track frames, and front and rear cross beams for coupling the left and right track frames in a shape of a lattice. A vehicle body frame is disposed between inner sides of the left and right track frames and coupled thereto in the shape of a lattice above the front and rear cross beams and the left and right track frames. The front and rear cross beams and the vehicle body frames are integrally constituted.

Abstract: A track vehicle employing a rail track system attached to the sides of the frame of a track vehicle having a continuous track driven by pneumatic tires mounted to the frame proximate each end of the rail system along such that triangular torsion and compression links are mounted to the continuous track such that the apex end slides along the rail and the other ends extending against the track to provides lighter more even ground contact for use on snow and other soft terrain than present track vehicles.

Abstract: A speed reduction drive is used with a crawler track that is an endless member mounted on suitable supports including a ground engaging portion for moving a vehicle attached to a track frame. The speed reduction drive comprises a drive case having an input shaft and an output shaft. The output shaft has a pair of track drive wheel sections mounted on opposite ends thereof that protrude out from the drive case. The input shaft has a sprocket drivably mounted thereon and carrying a chain that drives a sprocket on the drive shaft. The input shaft is driven with a hydraulic motor and has a normally spring-applied pressure released brake on the input shaft. The track drive wheel sections have bars or drive elements that engage lugs on the track to effect the driving arrangement when the track drive wheel sections are rotated.

Abstract: A mobile silvicultural apparatus for use in a land of trees comprising mature trees and immature trees. The apparatus includes a steerable wheeled support frame, an articulated boom, a motor system, and a control system. The steerable wheeled support frame has a horizontally extending ground-clearing section, and first and second opposite vertical side sections. The ground-clearing and side sections define a tunnel-shaped passage through which the immature trees are allowed to pass as the support frame travels thereover. The articulated boom is mounted to the support frame for selectively manipulating the mature trees. The motor system is used for imparting motion to the support frame and the control system is used for controlling the steerable support frame, the motor system, and the articulated boom.

Abstract: A grader vehicle has a vehicle body mounted on two drive tracks. A boom is mounted on the front of the vehicle and extends to the front of the body. A third drive track is mounted on the leading end of the boom by a steering mechanism for rotation about an upright steering axis. The three tracks are driven by separate hydraulic motors. The use of a steering, driven track on the boom provides a tractive force pulling the vehicle forwards in the desired direction of travel and positively driving the leading end of the boom in the direction of a turn. The track also provides a degree of packing at the center of the vehicle's path that can not be achieved with a ski gliding on the surface. This is of particular importance when packing ski trails with the vehicle. For grading purposes, the vehicle has a grader blade across the front of the vehicle and a second blade leading the front track.

Abstract: An articulated tracked vehicle that has a main section, which includes a main frame, and a forward section. The main frame has two sides and a front end, and includes a pair of parallel main tracks. Each main track includes a flexible continuous belt coupled to a corresponding side of the main frame. The forward section includes an elongated arm. One end of the arm is pivotally coupled to the main frame near the forward end of the main frame about a transverse axis that is generally perpendicular to the sides of the main frame. The arm has a length sufficiently long to allow the forward section to extend below the main section in at least some degrees of rotation of the arm, and a length shorter than the length of the main section. The center of mass of the main section is located forward of the rearmost point reached by the end of the arm in its pivoting about the transverse axis.

Abstract: The invention relates to a tracked vehicle having smooth driving and idler wheels 6, 7, 8 and 9, respectively, which frictionally transmit the tractive force to tracks 3, 4, in particular to rubber tracks, and which are mounted by means of a frame 3 which carries at least one driving engine 11.

Abstract: A drive assembly is provided that includes a roller frame, a motor located on the roller frame, and a drive system located on the roller frame. The drive assembly may also include an endless track configured to be driven by the drive system and adaptable to provide locomotion to the track-type machine. The motor may have a longitudinal axis substantially aligned with a longitudinal axis of the roller frame. The drive system may be driveably engaged with the motor. The endless track may be configured to be driven by the drive system and is adaptable to provide locomotion to a track-type machine. A track-type machine having the disclosed drive assembly and method of driving such a track-type machine is also provided.

Abstract: A snowmobile (20) having an engine (34) with an air charging system (70). The air charging system (70) is connected to an intercooler assembly (57), which includes a heat exchanger (56) mounted adjacent to an intercooler opening (48) in the track tunnel (36). A snow retention area (54) is located above the heat exchanger (56) allowing for snow/ice to be thrown from a snowmobile drive track (38) and build up on top of the heat exchanger (56), allowing the snow/ice to absorb heat from intercooler assembly (57).

Abstract: A universal adjustable-position mobility device for multiple use applications including robotics, industry and handicapped mobility facilitation. The device can be used to transport objects across varied terrain including inclines and declines and by utilizing a sliding extensible track system can bridge obstacles and traverse mud, sand and snow. The device further incorporates features which allow raising and lowering of the center of gravity of the load. By extending the rear wheels, the angle of the track mechanism relative to the ground to can be adjusted to facilitate engagement of the tracks with an abrupt incline such as when loading a wheelchair onto a vehicle.

Abstract: Disclosed are systems and related methods for mounting a ground-engaging motive device, such as a crawler track assembly, to a vehicle, such as a crane or the like, in either an extended or a retracted position. The systems and methods are adapted to ensure that proper alignment is reliably achieved between the mounting structures on the motive device and the corresponding mounting structures on the vehicle in both the extended and retracted positions. In one embodiment, the system and method are especially adapted for use in extending the crawler track assemblies on certain types of existing cranes without the need for extensive retrofitting.

Abstract: A personal mobility vehicle includes a frame with a pair of parallel tracks for moving the vehicle, the track having a lower surface forming a drive plane for the tracks. A seat is operably mounted on the frame, and has a support for moving the seat about a generally horizontal axis normal to a longitudinal axis of the tracks, to maintain the seat in a generally upright position as the vehicle moves up or down a slope. The seat is also operably mounted for rotational movement on a vertical axis, to permit the seat to swivel. A lifter arm is operably mounted on the frame, with a forward end pivotally connected to the frame at a location spaced above the drive plane, and a rearward end pivotal between a lowered position spaced below the drive plane and a storage position spaced above the drive plane. A cylinder selectively raises and lowers the lifter arm to assist the vehicle in traversing the upper end of a flight of stairs, in either the ascending or descending directions.

Abstract: A crawler that includes a first crawler assembly and a second crawler assembly attached to the first crawler so that the first crawler assembly is aligned with the direction of travel of the second crawler assembly.

Abstract: A crawler that includes a first crawler assembly and a second crawler assembly attached to the first crawler assembly so that the first crawler assembly is aligned with the direction of travel of the second crawler assembly.

Abstract: A personal mobility vehicle includes a frame with a pair of parallel tracks for moving the vehicle, the track having a lower surface forming a drive plane for the tracks. A seat is operably mounted on the frame, and has a support for moving the seat about a generally horizontal axis normal to a longitudinal axis of the tracks, to maintain the seat in a generally upright position as the vehicle moves up or down a slope. The seat is also operably mounted for rotational movement on a vertical axis, to permit the seat to swivel. A lifter arm is operably mounted on the frame, with a forward end pivotally connected to the frame at a location spaced above the drive plane, and a rearward end pivotal between a lowered position spaced below the drive plane and a storage position spaced above the drive plane. A cylinder selectively raises and lowers the lifter arm to assist the vehicle in traversing the upper end of a flight of stairs, in either the ascending or descending directions.

Abstract: A snowmobile four-cycle engine arrangement, includes: a four-cycle engine arranged in an engine compartment formed in the front body of a snowmobile with its crankshaft laid substantially parallel to the body width and having a cylinder case inclined forwards with respect to the vehicle's direction of travel. The engine employs a dry sump oil supplying system and an oil tank separate from the engine is provided. Another snowmobile four-cycle engine arrangement includes: a four-cycle engine having a cylinder head at its top, arranged in the engine compartment and inclined forwards with respect to the vehicle's direction of travel with an intake path provided on the upper portion of the engine body. An intercooler for cooling the intake air is arranged in a tunnel created inside the body frame for accommodating a track belt.

Abstract: A land clearing tractor and process are provided for selectively clearing a land of brush and trees. The tractor has a traction unit for moving the tractor along a direction of travel. A supporting frame is connected to the traction unit. The frame has first and second sides, and a raised section between the first and second sides. A first shredder head is operatively connected to the first side of the frame and oriented parallel to the direction of travel. The first shredder head is movable between elevated and lowered positions for clearing brush and trees in a first band. A second shredder head is operatively connected to the second side of the frame. The second shredder head is parallel to the first shredder head and is spaced apart therefrom. The second shredder head is movable between elevated and lowered positions for clearing brush and trees in a second band spaced apart from the first band. Thereby, the tractor leaves between the first and second bands a residual band of brush and trees.

Abstract: The invention relates to a tracked vehicle (10) comprising tracks (38) which are driven, a drive unit (28, 28) for each driven track (38), containing a drive wheel (52) which engages in said track (38), an electric motor (18, 20), a drive train (30, 32) which is connected before the drive wheel (52), and a shaft (34, 36) which driveably interconnects the electric motor (18, 20) and the drive train (30, 32). The inventive tracked vehicle also comprises a vehicle pan (12) which supports each drive unit (26, 28) on a wall (40, 42). The invention is characterized in that vibration damping means (44) are interconnected between the wall (40, 42) and the drive unit (26, 28) so that the drive unit (26, 28) is vibrationally isolated from the wall (40, 42) of the vehicle pan (12).

Abstract: A recreational vehicle which has a body which may be configured for land use or as a boat haul, the vehicle also having a pair of non interconnected spaced apart front wheels, an endless track located rearwardly of an intermediate of the spaced apart front wheels, a motor operatively connected to a drive at least the endless track and optionally the front wheels. The vehicle is able to handle most types of snow and land conditions and can be configured to operate in water if so desired.

Abstract: Hardened surface layers (12) and (14) of a nitride or other compound, which is higher in hardness than dirt or soil, are formed on the inner peripheral surface (11B) of each metal bush (11) and on the outer peripheral surface (13A) of each connecting pin (13) which constitute a crawler belt (7), respectively. In addition, resinous sliding bearings (15) which are each formed of an ultra-high molecular weight polyethylene-base resin are fitted in transversely spaced positions on the inner periphery of each metal bush (11) of the crawler belt. The resinous sliding bearing (15) is provided with a plural number of recessed grooves (16) on and around its inner periphery as axially extended grooves.

Abstract: A drive unit for a center pivot irrigation system is described which has a pair of track units mounted thereon. The drive tower includes an elongated base beam having opposite ends. A drive wheel is mounted on each end of the base beam with the drive wheels being driven in conventional fashion. An idler wheel is operatively rotatably mounted on the base beam inwardly of each end thereof adjacent the respective drive wheels. An endless track member extends around each of the drive wheels and the idler wheel associated therewith. Means is provided for vertical movement of the idler wheels as well as means for yieldably urging the idler wheels downwardly with respect to the base beam.

Abstract: An apparatus for determining the amount of lubricant within a housing is disclosed. The apparatus includes a shaft driving the housing about an axis, a number of interior components positioned within the housing, and an opening defined in the housing and centered on the axis. The distance between the a lower edge of the opening and the lowest portion of the housing is proportional to the amount of lubricant displaced by the components. The level of the lubricant within the housing determined relative to the lower edge. A work machine and method are also disclosed.

Abstract: An endless track includes an iron link belt, a continuous pad, and a connecting device. The iron link belt includes a link unit assembly constructed of a plurality of link units connected to each other. Each link unit includes a pair of links. The iron link belt may include a plate welded to the pair of links and extending perpendicularly to a direction in which the link unit assembly extends. The continuous pad includes the same number of core metal plates as that of the link units and a single urethane rubber belt covering and being attached to a ground opposing surface of each of the core metal plates. The urethane rubber belt extends continuously over all of the core metal plates. The urethane rubber belt may include a small thickness portion positioned between two adjacent core metal plates. The connecting device connects the iron link belt and the continuous pad.

Abstract: An all-terrain bicycle is comprised of a bicycle frame having a front and a rear fork to which is removably secured a front and a rear wheel. Each wheel has a circular rim which is interconnected to the hub by spokes. The rear wheel has sprockets secured to the central hub and which is interconnected to a driving sprocket by a chain or other such belt-like drive connector. Each of the rims is provided with a surface engaging support shoes assembly to provide support of the bicycle on a surface. Such bicycles are particularly useful for riding on soft and also irregular surfaces which are deformable such as sand, snow or the like.

Abstract: A land vehicle has a flexible central frame member which extends from a large front roller to a smaller rear roller, and is encircled by a flexible looped belt having projecting treads. An engine mounted above the belt drives the front roller, and two bogie wheels engage the belt within valleys formed in the treads. Two boot supports are fixed to the central frame member which support the feet of a standing rider. Rollers fixed to the central frame member support the belt as it travels around the frame. The minimal extent of the frame outside the belt exposes a substantial length of the belt edge to engagement with the ground, making it possible to control the vehicle by twisting and tipping, in a manner similar to the control of a conventional unpowered snowboard. A trailer or sled may be connected to the rear of the vehicle for towing cargo.