Abstract: A replacement bumper for a snowmobile ski is provided and methods for using the same. The replacement bumper has an abutment surface that makes contact with a spindle of a snowmobile in order to increase the contact surface area of a rear portion of a snowmobile ski and the ground and/or increase the weight being distributed on the rear portion of the snowmobile ski, which prevents the darting or tracking of the snowmobile ski. Also, includes is a method for removing an OEM bumper from a snowmobile ski assembly and installing a replacement bumper into said snowmobile ski assembly.

Abstract: A sail board foot repositioning system is provided. The sail board repositioning system has a plate assembly rotatably attached to the sail board top surface. The plate assembly provides foot attachment means and means for changing the orientation of the plate for a resulting desired foot orientation.

Abstract: Skibobs are disclosed having features for conveying the skibob with rider on a moving chairlift while the rider remains mounted on the seat of the skibob. The frame and suspension are configured for elevating the underside of the skibob seat above the level of the chairlift bench during loading, so that the chairlift bench, while moving forward from behind the rider, can pick up the skibob, rider and all, and carry the mounted rider up the ski slope without falling. As the undercarriage of the skibob is lifted off the snow, the rider is deposited on the chairlift bench so that the seat of the skibob is secured in place by the weight of the rider on the seat.

Abstract: Skibobs are disclosed having features for conveying the skibob with rider on a moving chairlift while the rider remains mounted on the seat of the skibob. The frame and suspension are configured for elevating the underside of the skibob seat above the level of the chairlift bench during loading, so that the chairlift bench, while moving forward from behind the rider, can pick up the skibob, rider and all, and carry the mounted rider up the ski slope without falling. As the undercarriage of the skibob is lifted off the snow, the rider is deposited on the chairlift bench so that the seat of the skibob is secured in place by the weight of the rider on the seat.

Abstract: Skibobs are disclosed having features for conveying the skibob with rider on a moving chairlift while the rider remains mounted on the seat of the skibob. The frame and suspension are configured for elevating the underside of the skibob seat above the level of the chairlift bench during loading, so that the chairlift bench, while moving forward from behind the rider, can pick up the skibob, rider and all, and carry the mounted rider up the ski slope without falling. As the undercarriage of the skibob is lifted off the snow, the rider is deposited on the chairlift bench so that the seat of the skibob is secured in place by the weight of the rider on the seat.

Abstract: A snow glider comprises a longitudinally-extending runner for supporting a rider on ridden snow and having a generally central, longitudinally-extending slot. The glider further comprises an elevated rider-supporting deck and chatter-absorbing means straddling the slot for supporting the deck above the runner. Preferably, the bottom surface of the runner is preferably generally convex across its width, with curved outer edges that provide directional control to the rider when turning, and at least one longitudinally-extending, generally straight longitudinally-extending inner edge adjacent the periphery of the slot for greater directional control when the rider is going straight. To enhance controllability, the deck of the preferred embodiment is preferably coupled to the runner near the runner's outer periphery so that the force exerted by the rider is transmitted from his/her feet directly to the outer edges of the runner.

Abstract: A snow-sliding vehicle including a bearing rear runner and a directional front runner to which is connected a steering column pivoting in a sleeve firmly attached to the upper end of a stiff frame connecting both runners, and the lower end of which is attached to a supporting base surmounting the bearing runner and provided for supporting the feet of the user. The front portion of said base is connected to the bearing runner by a mechanical connection providing it with clearance ostensibly perpendicular to said runner controlled by a damping device.

Abstract: A snowmobile steering mechanism adapted to place higher pressure on the outside ski than on the inside ski when the snowmobile enters and exits turns, said steering mechanism being adapted to include the suspension in the steering action of the snowmobile causing the snowmobile to automatically lean into a turn improving the ability of the snowmobile to enter and exit turns in comparison to a snowmobile without the inclusion of the suspension in the steering action of the snowmobile.

Abstract: A ski vehicle includes a frame having a first ski mounted thereon. A steering column having a handlebar attached thereto is rotatably mounted to the frame. A second ski is mounted to the steering column. A seat post has a first end and an opposing second end. The first end of the seat post is hingedly, removably, and/or slidably mounted to the frame. A seat is mounted to the second end of the seat post.

Abstract: A maneuverable sled is provided for use over snowy terrain. In particular, the sled includes a platform, a spring, and two runners. The spring slidingly engages the platform providing the sled with excellent maneuverability.

Abstract: A three runner sled includes a single steerable front runner and two directionally fixed rear runners extending from a frame. The frame has a longitudinal backbone member with an elongate seat. Each rear runner has a knee rest somewhat forwardly positioned relative to the seat. Each rear runner also has a foot rest at its rearward end. This configuration results in a kneeling position for the sled operator, providing a relatively low center of gravity for the sled and operator, yet allowing the operator to readily shift his/her weight laterally for better balance and control. The telescoping steering column connecting the front runner to the sled frame includes an adjustable suspension. Independently actuated brakes are provided at the rearward ends of the rear runners, controlled by separate brake levers. Attachments may be provided for carrying the sled on a person's back, for convenient sled transport.

Abstract: The recreational vehicle disclosed here is a ski bike with four skis which is steerable using a handle bar. Both the front and rear skis have suspension systems which have shock absorbers. Brakes on each from ski serve to slow the bike and to assist in steering the bike, and a rear brake is used to slow and stop the bike.

Abstract: A sit-ski includes a ski and a base frame which is mounted on the ski. A seat support is pivotally mounted on the base frame for rotation about an axis that is above the ski and substantially perpendicular to the axis of the ski. This allows the seat to move on an arcuate path about the axis of rotation. A shock absorber has one end which is connected to the seat support between the seat and the axis of rotation, and another end which is attached to the base frame. Accordingly, movement of the seat on its path causes compression or elongation of the shock absorber. The ratio for movement of the seat, relative to compression of the shock absorber is approximately 3.5:1.

Abstract: A foldable skibob includes a frame with a steering column journalled in a forward steering column bearing. A first pivot configuration is attached to the steering column and a front ski is articulated at the first pivot configuration. A second pivot configuration is attached at the rear end and a rear ski is articulated at the second pivot configuration. A first spring support supports the first pivot configuration against the steering column, and a second spring support supports the second pivot configuration against the rear end of the frame. A support element is provided at one of the first and second spring supports against which a respective pivot configuration rests when the skibob is in an operational condition. The support element is pivotable away from the support element towards a center region of the frame between the front end and the rear end for folding the skibob.

Abstract: A rescue sled adapted to be pulled by a snowmobile including a patient/material carrying section and an attendant support section. The patient material carrying section is configured to carry an injured person to be transported by the rescue sled from a remote, snow covered accident/crash sight to a location where the injured person can receive medical care. The attendant support section is designed to carry medical personnel who can attend to the injured person during transport. The rescue sled is supported for travel over rugged, snow covered terrain by a rear suspension assembly and a front suspension/steering assembly. The rear suspension assembly and front suspension/steering assembly both include left and right independent suspension units that provide the rescue sled with a smooth ride even at high towing speeds.

Abstract: An extendable nesting ski support structure as for supporting cargo including collapsed shelter devices for towing or pulling over ice, snow, and terrain. The skis are pivoted on brackets attached to the supported base and the brackets are atttached to the upper surface of flexible and resilient skis. By longitudinal shifting of the skis they are extendable and retractable as between sill supports beneath the supported base. The resilience and the flexibility improves the support system by providing shock absorption while in the extended position. A single lock serves both the extended and retracted skis, and on extension and locking, the skis are shaped by the flexural characteristics of the material of the ski.

Abstract: A bicycle seat is supported on a vertical member which is supported by, and connected to, leg members that form a Y configuration. The legs of the seat mount into spring loaded hinges which anchor to the runners of a dog sled or base of a wheeled cart. The seat is pivoted in a backwards direction to a predetermined position for use. The seat is supported by way of the hinges and a rope which connect the seat device to the vehicle of choice. When use of the seat is complete, the seat will spring forward by itself, and out of the way of the operator.

Abstract: A cryptographic system and method is provided which accepts a key K encrypted under a key formed by exclusive-ORing a key-encrypting key KK with a first control vector C5 and outputs the same key K encrypted under a key formed by exclusive-ORing KK with a second control vector C6. The set (C5, C6) represents a mapping of the type and usage of the key K defined by the control vector C5 to the type and usage defined by the control vector C6. The set of allowable control vector mappings, that is from C5 to C6, are defined in a control vector translation table, which is specified in advance by authorized installation personnel.

Abstract: An anti-sway system for a steerable vehicle of the type employing a torsion bar suspension system. Operatively coupled to the torsion bar for each of the vehicle's steerable wheels or skis is a mechanism for increasing the effective spring rate of the suspension upon cornering over that prevailing when steering a straight line course.

Abstract: The stand up articulated ski described herein consists of a steerable first ski in front, a combination of steering shaft with handlebars attached to the first ski, a second ski following the first with tandem, spaced, front and rear toe cups on top, a brake attached to the tail of the second ski, pivot pin assembly joining the second ski to the steering shaft, and a coil spring on the steering shaft, interposed between the pivot pin assembly and the first ski. The pivot pin assembly consists of a case tube assembly coaxial with the steering shaft, a pair of spaced pivot pin plates, each supporting an upwardly directed pivot pin coaxial with the rotational axis integrally attached to the case tube and adapted to engage corresponding ones of a pair of pivot bearings integrally attached to a bearing fixture that is attached to the tip of the second ski.

Abstract: Herein disclosed is a snowmobile stabilizer system which is constructed such that independent suspension systems attached to the right and left of a front portion of a snowmobile body for supporting steering skis, respectively, are equipped with air cushions, respectively, which have their air chambers communicating with an air reservoir through normally open adjusting valves. These normally open adjusting valves are controlled to associate with the steering operation of a steering handle such that the adjusting valve positioned at the side opposite to the steering direction is throttled.

Abstract: A snowmobile includes a pair of skis connected to the snowmobile frame by a forward suspension including a pair of telescopic struts which are biased to normally extended positions and are connected to a stabilizer member including a transverse torsion bar. A drive track of the snowmobile is suspended from the frame by a rear suspension, including a link pivotally connected between the frame, and a pair of slide rails and biased downwardly by a pair of torsion springs having respective ends engaged with a pivotally mounted spring end retainer which is connected to the torsion bar of the forward suspension by a pair of motion transfer links which act to "soften" the rear suspension in response to upward telescopic movement of one or the other or both of the telescopic struts.

Abstract: An anti-roll and self-centering torsion bar arrangement for the front suspension of a snowmobile. A torsion bar is interconnected between the strut suspensions of the front skis so as to be loaded during cornering and prevent roll. In addition the point of connection between the torsion bar ends and the skis is such that a self-centering force is generated during steering movements. The torsion bar and its connection to the suspension is disposed so that the suspension and forwardmost portion of the body will be protected from damage when obstructions are encountered.

Abstract: Suspension and steering assembly for a snowmobile including at least one ski for supporting a front portion of its body and also for steering the snowmobile, comprising a strut means capable of telescopically expanding and contracting, spring means, a shock absorber and a steering arm means. The strut means includes a first or inner strut member and a second or outer strut member, the first strut member being slidably mounted in the second strut member. The first or inner strut member is pivotally connected at its lower end to the surface of the ski. The second or outer strut member is rotatably supported to the body of the snowmobile. The spring means is operative to urge the two strut members to slide out of each other. The shock absorber is pivotally connected at one end to the ski and at the other end to the second strut member of the strut means, and extends obliquely with respect to the strut means.

Abstract: A snowmobile has a front pair of skis carried by a front suspension, including right- and left-hand telescopic strut assemblies. The front suspension includes a U-shaped stabilizer bar having an intermediate section arranged for being loaded in torsion and right- and left-hand leg sections respectively linked to swivelly and telescopically mounted strut tubes so that during right- and left-hand turns, the stabilizer bar respectively acts to resiliently resist collapse of the right- and left-hand telescopic strut assemblies.

Abstract: A snowmobile includes a frame and a steering ski. A suspension interconnects them so the ski supports and steers the frame. A stationary cylinder is fixed to the frame, and a movable cylinder slides in it. A rod is fixed to the stationary cylinder and carries a head which acts as a restriction to dampen physical shocks. A rod compensation chamber is mounted to the ski and connected to the lower part of the movable cylinder by a flexible conduit. The ski is pivotally mounted to the movable cylinder. A floating piston is slidably fitted in either the rod compensating chamber or in the movable cylinder so that a gas charge can be injected on one side of it, said gas charge occupying all or part of said rod compensating chamber, the other side of said floating piston confronting oil in or from the lower portion of the movable cylinder.

Abstract: A snowmobile ski suspension comprises a telescopic strut formed from a fixed support tube and a guard tube reciprocably and swivelly mounted in the guard tube. The support tube is fixed to one end of a crossbar of the snowmobile frame. Steering of a ski attached to the bottom of the guard tube is accomplished by rotating a bifurcated steering arm, which is journaled on the support tube so as to straddle the crossbar, the steering motion being transferred to the ski by a hinge connected between the steering arm and the ski. A shock absorber and a coil compression spring are mounted in the strut and act to resist collapse of the latter.

Abstract: An improved connection between the two steering posts and the steering skis at the forward end of a snowmobile which includes for each post and each ski a downwardly convexed leaf spring connected at its front and rear ends to the ski and bracket structure that connects the intermediate portion of the spring to the post. The bracket structure includes a pair of brackets, one of which is connected to a forward portion of the spring and the other of which is connected to a rearward portion of the spring so as to have a relatively long length of spring between the two portions. The two brackets have vertical walls that are disposed side-by-side and extend upwardly to be connected to a horizontal trunnion mounted or fixed to the lower end of the post.

Abstract: A suspension and steering assembly for a ski of a snowmobile includes a coil spring and shock absorbing means including a shock absorbing piston and rod connected at one end thereto. The shock absorbing means and coil spring are arranged generally parallel with each other and telescoping strut members connect the ski to the snowmobile. A first strut member has a bottom end suitable for connection with the ski and a second strut member is slidingly connected to the first strut member and adapted to telescopically receive the latter member therein. Means are provided to permit the second strut member to rotate about a longitudinal axis thereof in order to steer the ski. The shock absorbing means is disposed within the strut members and one end of the coil spring resiliently supports the first strut member in such a manner that the first strut member is biased towards a position out of the second strut member.