Abstract: Adjustable axle or similar telescoping structure includes an outer frame tube of square section which telescopingly receives an inner tube having a top shim-contacting surface, two parallel side surfaces, and a lower wall of inverted V-shaped section defining two additional downwardly directed shim-contacting surfaces. Three flat plates of a polymer material are supported between the three shim-contacting surfaces and the outer frame tube. One pad is attached to the upper surface on the inside of the outer tube. The remaining two pads are connected to a wedge-shaped steel bar and are oriented upwardly by the bar to contact the two shim-contacting surfaces on the inverted V-shaped section. The bottom wall of the outer frame tube is drilled and nuts are welded onto the outer surface to receive bolts which are screwed into the nuts to contact the bottom of the bar. When the bolts are tightened, they force the inner tube upward so it contacts the upper pad.

Abstract: A rear axle auto-tracking system automatically ensures that the rear axle follows the front axle on an agricultural vehicle having adjustable front and rear track assemblies. With the auto-tracking system energized, the vehicle operator simply adjusts the front track while driving and the rear axle automatically adjusts to stay in line with the front track within about .+-.1/2 inch per side. The system can be turned off to allow independent rear track adjustment. If the system is re-energized while driving, the rear track will quickly adjust to follow the front axle setting. As when adjusting the front track, the vehicle must be moving when adjusting the rear axle track.

Abstract: A telescopic tractor frame comprised of two interconnected cylindrical frame members which allow the frame to extend a contract and to pivot horizontally along the frame's axis. The frame may be extended to carry large loads or contracted to increase maneuverability. The frame may also be extended and contracted repeatedly to extricate the tractor from muddy or boggy soil.

Abstract: A trailer having a fixed framework and a telescoping framework engaging the fixed framework for shortening or lengthening of the trailer; a flexible floor foldable for use in either mode; a hitch assembly which permits ninety degree upwardly pivot of the trailer, when in the shortened mode for non-ground support portability on the towing vehicle; and a support bar engaging the towing vehicle for holding the trailer in the supported, portable position. A substantially V-shaped housing on the trailer provides a storage container with low center of gravity and also provides an axle housing for the trailer wheels.

Abstract: A narrow profile, variable width stump grinder comprising a stump treatment tool adapted to forcibly grind a stump and a variable width carriage. The carriage comprises a rigid elongated frame and independently driven wheels coupled to the frame by extensible axles or struts. The frame comprises a longitudinal central member terminating in a header supporting the tool and a front tongue adapted to be coupled to a tow vehicle. The retractable struts are oriented generally perpendicularly to the longitudinal axis of the machine. The header comprises a housing defining parallel sleeves oriented perpendicularly to the axis to receive the struts. A hinged stand is pivotally secured to the top of the header to support the treatment tool in a raised position for transport. A linkage interconnecting the struts and a hydraulic cylinder deploys or retracts the struts to widen or narrow the grinder's stance. The linkage comprises an L-shaped crank pivoted to the frame.

Abstract: A variable tie-rod assembly for a steering wheel structure of a row crop applicator. The tie-rod assembly can be adjusted and secured in any position between a minimum and maximum track setting. Thus, a selectively variable track width is provided. Toe-in settings are maintained by implementing a dual-cam arrangement with a locking pin to maintain the steering structure in a forward direction during track width adjustment procedures. The track width setting can be adjusted without the operator ever having to leave the cab of the row crop applicator, wherein the track width can be visually ascertained by observing indicia on the telescoping wheel structure.

Abstract: A pair of tiltable, flatbed sport vehicle transport trailers coupled in side-by-side arrangement. The invention is a modification which employs a common drawage hitch, for coupling thereto a pair of trailer drawbars, an axle extender for coupling the hubs of the side-by-side arranged trailers to form a common axle and an optional modification of each trailer drawbar fixing mounts that allows the drawbars of the individual trailers to be canted, that is obliquely postured so that the centerlines of the drawbars will then converge at a common point, to which is proximately fixed the common drawage hitch. Thereafter, a towing vehicle will be coupled to the common drawage hitch and the side-by-side pair of trailers drawn as a single unit.

Abstract: A trailer comprising an open top rectangular box member which is detachably attachable to a support assembly which is attachable to a motor vehicle so that the trailer can be towed. The support assembly comprises a support member mounted on two wheels, the open top box member being attached to the support member when the trailer is ready for use and detachable therefrom when the trailer is not in use. The support assembly is, when detached, locatable within the open top box member so that the support member at least substantially closes the open top of the box member to thus form a box-like structure which can be stored resting in any desired face.

Abstract: A mobile racking system for installation in a trailer van which is fitted on the inside sidewalls with a number of load retaining strips at different elevations to define different elevation loads. A number of clamping bracket assemblies are releasably attached to the retaining strips, each assembly being provided with a releasable engagement device for accepting a C-shaped track member to provide a pathway for accepting and supporting a carriage in the form of a roller pallet. The releasable engagement device has a cam member for securing the C-shaped track member to the load retaining strip. The roller pallet extends substantially across the width of the trailer van, the roller pallet having at least on one side, a pair of rollers which are rigidly secured to axles which are adapted to move laterally on the pallet to accommodate differences in the spacing between the two side walls of the trailer. The clamping bracket assembly has a "["-shaped body having upper and lower arms joined by a bight.

Abstract: A detachable hopper and vacuum apparatus which includes a mobile, detachable hopper adapted for use with the vacuum apparatus of this invention or towed by a tractor or alternative towing vehicle or apparatus, and characterized by a sliding tongue which is extendible in one embodiment for coupling to the towing apparatus and retractable in a second embodiment for coupling to the vacuum apparatus by means of a dual-contact coupling system. The hinged panel defines the upper half of the front panel of the detachable hopper and features a window for receiving the discharge chute of the towing vehicle or vacuum apparatus. Pivoting tandem wheels are provided on the detachable hopper for easily traversing uneven terrain.

Abstract: Pneumatically actuated horizontal drilling apparatus includes a base frame with a plurality of horizontally extending drills adjustably secured thereto, and the base frame and the drills are pneumatically actuated on a selective basis. Horizontal movement of the apparatus is accomplished by a pneumatic motor, and movement of the drills, both outward from the apparatus for drilling, and inward from the work for retraction, as well as rotation of the drills themselves, is also accomplished pneumatically and selectively. The drill apparatus is maintained at a predetermined distance from the work while drilling operations are taking place and while horizontal movement of the apparatus is taking place by means of canted wheels rotating in the vertical plane and by horizontally rotating wheels disposed against the work to be drilled.

Abstract: An adjustable gauge steering axle is disclosed which comprises an adjustable length beam and a steering control including a double-acting, dual piston rod hydraulic cylinder. Each piston rod of the hydraulic cylinder is connected to a corresponding steering arm through a respective strut which is adjustable telescopingly in length; a swivel joint intervenes between the rod and the strut.

Abstract: A trailer suitable for hauling farm implements along highways is expandable from a contracted, empty position to an expanded loaded position. In expanded position, the rear support wheels are outside normal highway width limits. The trailer frame has a forward section, supported at its rear with centrally located ground wheels, and a pair of rear sections each supported by an outside wheel. Each rear section has a pair of transverse telescopic beams. One set of vertical hydraulic or pneumatic cylinders lifts the forward central wheels and the rear sections off the ground. A set of transverse cylinders moves the outside wheels to expanded position. Each outer rear beam section has a loading ramp hinged thereto about a transverse axle and a wheel support hinged thereto.

Abstract: A trailer is provided having a frame (2) upon which a bed (3) slides. The frame (2) has a wheel and axle assembly (1) and (5) disposed thereon which is connected thereto by a spring hanger assembly (6). The spring hanger assembly (6) is comprised of a spring and axle assembly (17). A tongue and coupling (7) is provided for connecting one end of the bed (3) to a vehicle. The bed (3) slides relative to the frame (2) when the wheels (5) are locked and the tongue assembly (7) pushed rearward. The bed (9) tilts when the rearmost portion moves the center of gravity away from the wheels (5). The end of the bed (3) will contact the ground, allowing loading on the surface thereof.

Abstract: An improved connection is provided for mounting a trailing arm air suspension to the subframe of a slider suspension. A beam is welded to the bottom of a pair of frame rails, and a hanger bracket is welded to the bottom of the beam. One or more gussets is mounted to the beam to strengthen the connections between the hanger bracket and the beam and the beam and the frame rail. The connection also includes a support bracket for the air spring. The support bracket includes upper and lower flanges, with the lower flange mounting an upper end of the air spring and being mounted to the bottom of the frame rail. The upper flange extends acutely upwardly from the lower flange and is connected to an upper portion of the frame rail.

Abstract: The invention provides apparatus for precise, well controlled positioning and levelling of factory constructed buildings. The apparatus comprises units used in pairs, one near each end of a building being installed. Each unit is a four wheeled vehicle with a jack at each end. Each wheel is independently driven and the units are remotely controlled, using cables, hydraulic or pneumatic hoses or wireless apparatus. In use the units are moved under the building under their own power and adjusted and maneuvered so that the jacks can engage the longitudinal beams used in factory manufactured buildings. The jacks are then operated to raise, lower and level the building and the wheels are driven to move the position the building desired. The jacks support pivotally mounted jack plates which can remain in secure engagement with the beam while the units are maneuvered such that the building can be moved lengthwise or sidewise or turned about an axis essentially perpendicular to the terrain.

Abstract: A painters palette consisting of an upper platform, a middle platform, a lower platform. The system is designed to be moveable by the use of four ball casters, to be raised or lowered by the use of a center spine screw bolt and a center spine screw nut. The center spine screw bolt is connected to the upper platform holding bucket bottom. The center spine screw nut connected to the middle platform is used to receive, guide and support the spine screw bolt and the upper platform with the lower platform giving support to the middle platform. Embodiments disclosed include the oblong trim pallet; the flat paint spout lid with screw cap; the flat platform cover with four molded legs; the roller pallet having angle duel ends and four top angle molded legs.

Abstract: A movable case for making a steerable wheel steerable is slidably held in an axle case, a tie rod for a steering operation is made telescopically movable, and the movable case and the tie rod are arranged to be locked at an extended or retracted position. At the time of effecting tread adjustment, a steering wheel is rotated to its extreme end, and the vehicle is made to run with the movable case made slidable, which allows the movable case to slide outward through the axle case, permitting tread adjustment to be carried out automatically.

Abstract: A trailer assembly comprises spaced wheels connected by an axle, an elongate tow bar assembly projecting forwardly from the axle, and a load carrying frame pivotally mounted on the axle for movement between an upright, ground position for loading and unloading, a first towing position in which the frame is inclined forwardly, and a second towing position in which the frame is horizontal. First and second latching mechanisms are provided for releasably latching the frame in the first and second towing positions, respectively.

Abstract: A welding machine for foil webs which are overlapped comprises an undercarriage which includes a rectangular frame having longitudinal frame members and laterally adjustable transverse frame members with wheels supporting the frame. A welding device is positioned on the frame and it in the frame includes centering elements which may be adjustable so as to position the welding device accurately in respect to the frame. The welding device itself advantageously includes slots extending inwardly from each side into which a respective foil end is positioned and roller means which engage with one of the foils for guiding it as the undercarriage is moved over the top of the respective foils to be welded together. The undercarriage during the welding device includes a drive from the wheels to the rollers which includes a shaft assembly having a plurality of universal joints.

Abstract: An adjustable wheelchair comprising a supporting frame having a front, a rear and a pair of sides defining a seat portion inbetween; a pair of main wheels rotatably mounted to the frame and a pair of secondary wheels rotatably mounted to the frame for pivotal movement with respect thereto. The frame includes a series of split clamps for continuous adjustment of the width of the seat portion over a defined range. A cushion is fastened to the seat portion by means of a pair of overlapping flexible supports having Velcro material thereon for joining the supports of varying degrees of overlap. The main wheels and secondary wheels are adjustable in both vertical and horizontal directions, and the chair is collapsible horizontally as opposed to vertically. The armrests are rotatable for allowing the chair back to be collapsed. A pair of footplates are swingably mounted to the frame for pivotal movement and the footplates may also be adjusted to varying degrees of inclination with respect to a horizontal plane.

Abstract: A soft terrain earth digging machine, especially for the clearing and dredging of ponds, swamps or canals, of a type consisting of a bearing structure fitted with a central and lateral stabilizers and equipped with at least one earth digging device such as shovel, this device being controlled from a pilot cabin mounted on the bearing structure, wherein the central stabilizer is secured to a control carriage moving between two side rails of bearing structure, at least two support devices such as wheels or walking legs being mounted on telescopic arms ensuring the displacement control of these devices.

Abstract: Apparatus for drilling horizontal holes includes a frame for holding a drill, and the frame is supported by a single wheel adjacent to the drill and dual wheels at the opposite end of the frame from the drill. A cable system is utilized for moving the drill inwardly toward the work and outwardly away from the work by a single operator. A single operator can also move the frame as required at the work site. Multiple drills may also be secured to the frame, so that a plurality of holes may be drilled substantially simultaneously.

Abstract: A system in which a self-propelled fork lift truck that is collapsible to a compact structure for storage is made transportable on a highway freight handling truck, by lifting itself into an enclosed bay of the highway truck, or onto a platform attached to the highway truck, or onto a trailer pulled by the highway truck.

Abstract: A dolly system for campgrounds, parks and the like. A picnic table dolly, a general purpose dolly and various attachments for the general purpose dolly are included in the system. The picnic table dolly is suitable for use alone or in combination with the general purpose dolly for moving conventional picnic tables. The various attachments for the general purpose dolly adapt it for movement of garbage cans, trailers, charcoal grills and the like, firewood and other similar heavy objects commonly found in campgrounds, parks and the like.

Abstract: A truck extension attachment for increasing the capacity of a truck bed to carry articles which project rearwardly out of the truck bed includes roller means mounted to the truck bed frame, a retractable frame passing through the roller means, a rear cross frame connected to the retractable frame and means for connecting the retractable frame to the rear cross frame. The roller means have one or more roller housings mounted to the truck bed frame with each roller housing having a pair of rollers vertically aligned within the roller housing. In a storage position, the retractable frame lies beneath the truck. By pulling the retractable frame rearwardly through the roller means, the retractable frame is placed in an operational position in which the retractable frame extends partially beyond the rear of the truck bed. The rear cross frame lies parallel to the rear of the truck to support articles projecting from the rear of the truck bed.

Abstract: A forklift truck is provided which is capable of raising and lowering itself and a load back and forth between two surfaces at different levels. The forklift truck comprises a body; telescoping rear legs which carry powered, ground-engaging wheels; one or more powered, steerable, ground-engaging wheels on the body; a vertically movable lift mast; and a pair of front legs which can be moved back and forth between a work position in which they support the load and a carry position.

Abstract: The invention relates to a mobile crane or aerial lift platform vehicle wherein at least one of the axles is extendable and wherein a cylindrical housing carries the extendable axle beam and a steering actuator is carried on at least one of the beams and is connected to a steering link connected between the wheel and the outer end of the beam. The arrangement is such that the distance between the actuator and the steering link is not altered by extension or contraction of the beam relative to its housing.

Abstract: A telescopic 4-sided extension fits inside the frame of the shopping cart and is attached thereto with clips or a spring loaded catch for slidable vertical movement.

Abstract: The self-propelled freight handling truck is comprised of a manually guided wheeled frame on which is mounted a mast and lifting forks, with a motor for supplying power to raise, lower, and tilt the forks, to propel the vehicle, to move front wheels laterally outboard to straddle a load or laterally inboard under the load while the load is being carried, and to extend or retract the front wheels telescopically the guide handle and said forks being foldable into a collapsed, compact storage position. A beverage handling system is also provided comprising a side-loading highway truck for transporting a driver, unitized loads of beverages and freight, and the self-propelled fork lift truck mentioned above. The truck and system of this invention is particularly useful in the handling of full or partially unitized beverage loads between the side-loading highway truck and the delivery facility.

Abstract: A movable storage cabinet includes a plurality of saddles, in the form of inverted channels, and each provided with holes in its opposite lateral sides which receive the shafts of wheels. The saddles extend in the direction of depth of the cabinet, and the front and rear ends of adjacent saddles are connected together by a connection member, thus forming an underframe of the cabinet.

Abstract: Industrial trucks commonly include a unitary frame having a roller mast and carriage assembly mounted forwardly thereon. The ability of such trucks to traverse narrow aisles is limited and their stability is normally increased with use of outriggers, counterweights, or the like. The vehicle (10) of this invention, such as an industrial truck, comprises a rear frame (14) and a pair of laterally spaced front frames (16) pivotally mounted forwardly on the rear frame (14). A roller mast (20) and carriage (26) is adapted to be mounted forwardly on the rear frame (14), between the front frames (16). The vehicle (10) will thus exhibit high degrees of maneuverability and stability by its ability to pivot the front frames (16) towards and away from each other, depending on the job task under consideration.

Abstract: A foldable hand cart formed with a platform in front and frames extended to form a high back. The cart is collapsible to form a compact assembly bound together by an elastic cord. The platform is automatically locked when unfolded, as are the frames when raised in consecutive order. Simple controls serve to unlock the frames and platform for movements collapsing the cart. Interfitting safeguards reinforce the frames against separating, pivoting and twisting strains.

Abstract: A variable tread vehicle includes first and second parallel horizontal rails which are connected to a frame and extend in a direction which is transverse to the direction of movement of the vehicle. First and second movable carriages are movable on sections of the track formed by the rails. A first drop axle is connected to and extends downward from the first movable carriage, and a second drop axle is connected to and extends downward from the second movable carriage. Connected near the lower ends of the first and second drop axles are first and second wheels of the vehicle. The first and second movable carriages are moved on the track by first and second threaded drive shafts, which are driven by hydraulic motors. By controlling the hydraulic motors, the operator can drive the first and second movable carriages outward to increase the spacing between the first and second wheels, or can drive the first and second movable carriages inward to decrease the spacing between the first and second wheels.

Abstract: A rack and carrier for stacking and transporting firewood for both commercial and residential use which is capable of standing freely in a rigid manner when fully assembled and being collapsable for easy storage in a narrow or flat space. The rack is constructed from a pair of upright side frame members which are held in rigid spaced relation by three brackets attached at the bottom, midway and the top of the frame members by certain attachment means. The rack when constructed for residential use can be moved using handles attached to the top portions of the frame members, such handles can be fixed, pivotable or removable, and a pair of wheels attached to the bottom of the frame members. The rack when constructed for commercial use rests on a set of legs which provide sufficient clearance for the tines of a lift truck and can be moved by such lift truck or an overhead crane which can hook into the bottom opening of each of the set of upper attachment means.

Abstract: A ring supported, self-propelled truck crane and method of operation is disclosed wherein a boom is mounted on the chassis for pivotal movement only about a horizontal axis. The chassis is driven into an incomplete segmented ring set up at a working site with rollers on end portions of the chassis projecting downwardly and overlying the ring when the ring opening is closed by adding an additional segment thereto. The ring is then elevated to lift the wheels of the chassis completely off the ground and drive means interconnect the ring and the chassis to rotate the chassis about the vertical axis of the ring. Flanged rollers journaled on the chassis engage the ring to center the chassis on the ring and to rotatably interconnect and support the ring on the chassis for transportation therewith to the next site when the ring and chassis are lowered for support entirely upon the wheels of the truck crane.

Abstract: Device for transferring an invalid from his invalid chair to a motor vehicle, and conversely, while staying on his seat, wherein the seat of the invalid chair is removably mounted on an undercarriage having two bearing back-wheels and two steering front wheels. The motor vehicle has a pair of arms which are extensible towards the outside and retractable inside of the vehicle and are also vertically movable. The arms fit into female slippers on the removable seat to effect the transfer of the seat to the vehicle.

Abstract: A jack and tie-down system for the front end of a vehicle mounted box shaped cargo unit having a front wall and a transversely extended chamber means secured to the inner surface thereof. A pair of front jack assemblies each includes a horizontal support structure guidably mounted within the chamber means for movement from a storage position in the chamber means to an operating position projected outwardly from an associated end of the chamber means. A linearly extendible and retractible jack unit is releasably mounted at the outer end of each projected support member for adjustment into and out of ground engagement. When the cargo unit is to be transported the jack units are retracted and detached from their associated support members. Each jack unit is then received within a support member, and the resulting assembly stored in the chamber means within the transverse confines of the cargo unit.

Abstract: A vehicle undercarriage includes a pair of track laying assemblies each provided with at least two pairs of wheels having an endless belt tread wrapped thereabout. Variation of the vehicle wheelbase is achieved upon actuation of an extend/retract device serving to displace in a fore and aft direction at least one wheel of each track laying assembly. Further actuation of the same extend/retract device or of a separate variable pitch assembly produces an elevation or depression with respect to a horizontal plane, of at least one distal portion of each track laying assembly to accommodate varying terrain while also altering the size of the tread footprint. During all of the displacements of the tread, a take-up assembly automatically absorbs and lets out excessive portions of the endless belt tread. An improved tread construction provides a medial rib offering an axially-extending ground engaging contact surface.

Abstract: A dolly is provided for transporting and storing textile tubes. The dolly comprises a split shallow-walled platform mounted on a plurality of casters. The two halves of the platform are hinged so that they can be pivoted to an open or closed position. One half of the platform is mounted on at least two stationary casters to inhibit lateral movement of the dolly when in the open position.

Abstract: A wheeled platform base of adjustable length, fitted with straps for securing a load to the base, with projecting handles mounted to an end wall of the base and with shoulder padding fixed under the base end to enable a household mover to lift and support an end of the carriage on his shoulder for the moving of items of furniture placed on the base.

Abstract: A steering mechanism particularly suited for vehicles of the type having a variable width track. The steering mechanism is flexible enabling it to automatically extend and retract laterally along with the track of the wheels of the vehicle. The mechanism acts on steering arms of the steerable wheels of a vehicle to simulate a conventional tie rod type of steering geometry. During turning, the inner wheel turns more than the outer wheel to minimize tire slippage or scrub. A flexible steering linkage assembly is connected between the steering arm ends of the pair of steerable wheels to maintain controlled spatial relationship between them which results in a simulation of tie rod steering geometry.

Abstract: A load carrying vehicle is provided with a pair of wheel assemblies which are swingable relative to the frame to vary the width of the track. The wheel assemblies are supported on torsion bars which extend along the frame and may be rotated by a hydraulic cylinder. The torsion bars also provide springing for the vehicle.

Abstract: A dolly member for supporting a wheel of a towed vehicle comprising a rectangular frame, a trough member supported by said frame for receiving a wheel of a towed vehicle, a pair of longitudinally aligned wheels pivotally mounted on one side of the frame, a beam transversely secured to said frame on the side opposite the wheels, a stirrup-shaped member rigidly secured sideways near the end of said beam, whereby when a pair of such dolly members are disposed opposite one another and the beams are adjacent one another, the stirrup-shaped member is adapted to hook onto the beam of the opposite dolly member.

Abstract: An aerial lift platform apparatus has a wheeled chassis, a turret on the chassis and a boom pivoted to the turret. The wheels are carried by extendable axles, to provide increased stability. The boom is depressed to raise at least one wheel, to permit its extension and retraction. Preferably, there are four wheels on two axles, and the wheels of each axle are successively raised and then extended or retracted.

Abstract: A vehicle towing support structure, particularly adaptable for installation on a snowmobile, which may be disassembled, when not in use, and stored within the fixed section of the housing permanently mounted to the vehicle. In the assembled form, the structure is in the form of a ski, mounted to a vertical leg fixed to the attached housing unit, with the installed vehicle lifted so that its traction belt or wheel is above the ground surface on which the ski rests. A wheel which is stored elsewhere may be substituted for the ski of the unit. The structure includes a housing box permanently fastened to the structure of an intalled vehicle, two leg sections, which attach to each other and to a slide member mounted in the housing box. A ski is formed of two additional sections that fasten to the leg section, and the unit includes additional brackets and locking pins necessary.

Abstract: A crawler type vehicle has unique means for connecting roller frames with associated track to the car body for mechanical movement of the roller frames and associated track outwardly from the vehicle for selectively providing a wider work base for the vehicle. The connecting means of a construction sufficient for assuring desired connections of the roller frames to the car body at first and second positions of the roller frames and associated track.

Abstract: There is disclosed a trenching machine construction of vehicular type, having a wheeled chassis for travel movement with frames connected thereto, whereby trenching means supported by said frames are adjustable vertically, transversely and angularly with respect thereto, the weight of the means being shiftable longitudinally for such travel movement, means and power for effecting such adjustments being provided.

Abstract: A storage facility with spaced apart shelf frames has a two tower crane between respective two frames which are spaced by about a container width. Each tower of the crane has a motor driven carriage and an up and down moving elevator with laterally extensible holders for containers. The spacing between the two towers is defined by distance adjustable connectors, which provide for fine tower positioning and locking to adjust the tower spacing to different container lengths.

Abstract: A grader of the type including a longitudinal overlying boom connecting a front wheel assembly to a rear tractor unit with a blade carrier frame assembly positioned intermediate the front wheels assembly and the tractor unit. This grader is characterized by a boom which is longitudinally adjustable, laterally swingable and mounted over the cab to allow selective adjustment between a maximum effective wheelbase and a minimum turning radius to allow a lower cab and overall profile of the grader, and to provide an increased effective field of vision to the operator and to provide roll-over protection for the operator. This grader also distinctively includes a blade, the carrier frame of which is rearwardly connected to the tractor unit rather than forwardly to the boom, such as to be pushed by the tractor unit instead of being drawn by the boom, to thus allow a boom of lighter construction.