Abstract: A collapsible utility cart including a frame having an upper pivotal component, a lower pivotal component and side components positioned therebetween. The frame has an extended orientation and a collapsed orientation. The frame has wheels disposed in corners thereof. An inner basket is dimensioned for securement within the frame. A locking component is provided to lock the frame in a collapsed orientation. A telescopic handle is pivotally coupled to the frame.

Abstract: A vehicle jack and dolly for quickly and easily raising the vehicle includes a support which is slipped around the bottom of the tire from the side of the vehicle, pivot bars and axles that are parallel to, spaced from and rotatable around the pivot bar. Short bars extending from the axles may be forced downward to rotate the axles and lift the vehicle to the point where a hook drops in place to lock it. The axles have small wheels so that two dollies may be used on two opposite wheels to move the vehicle.

Abstract: A retractable and extendable wheel assembly for mounting to a vehicle at wheel positions of the vehicle. The assembly comprises an axle shaft on which a wheel having a central axis can rotate, and a strut having a first end pivotally mounted at a first strut mount site to the axle shaft and a second end pivotally mountable at a second strut mount site to the vehicle. Additionally, the assembly includes an inflatable and deflatable air ram having a first end pivotally mounted to the first end of the strut and a second end pivotally mountable to the vehicle at an upper ram mount site substantially directly above the axle shaft. The second strut mount site is situated forward or rearward from the upper ram mount site. Release of air from an inflated air ram results in a retraction of the ram and the vehicle descends.

Abstract: An apparatus is used for manually moving heavy machinery having a rectangular base that rests on a floor. The apparatus contains two components, a rectangular frame and a handle. The frame is formed of four two-sided corner sections that telescope so that the size of the frame is variable. The corner sections contain a platform extending between the bottom surfaces of the two sides. The frame contains two wheels mounted along the exterior surface of one side of the frame and a hitch member mounted along the exterior surface of the opposite side of the frame. The handle has an elongated vertical pole portion, a hand grip at the top end, two wheels at the bottom end, and a projecting hook member extending from the bottom end in a horizontal direction.

Abstract: A ground-loading conveyance for refuse or heavy objects. The frame is tipped with the handle to allow a two wheel carriage on pivoting support legs to swing beneath the frame, so as to support the load for transporting.

Abstract: The floor cleaning machine is designed for both side-to-side and for linear straight path operation. This is accomplished by having at least one recessed rear transport wheel and at least one side-mounted support wheel. The rear transport wheel is recessed and is used for floor machine transport. The side-mounted wheels are adjustable in a rotatable or a vertical plane and are used in a lowered orientation to support the floor cleaning machine for straight path operation. These side-mounted wheels are in a raised position when the floor cleaning machine is to be used in a side-to-side cleaning operation. Thus the position of the side-mounted wheels determine the mode of operation of the floor cleaning machine. Whether used for straight ahead operation or side-to-side operation, the recessed transport wheels will be used to move the floor cleaning machine from location to location.

Abstract: An overhead crane adapted to be supported on a pair of spaced apart, generally parallel first and second rails, the crane having a frame having opposite first and second ends, a first wheel rotatably mounted on the first end of the frame, the first wheel being adapted to roll along the first rail, a second wheel rotatably mounted on the second end of the frame, the second wheel being adapted to roll along the second rail, a first bearing assembly supporting the first wheel, a second bearing assembly supporting the second wheel, each of the first and second bearing assemblies including a bearing supporting the associated wheel for rotation relative to the frame about a rotation axis, the rotation axis having a position relative to the frame, and a mechanism connecting the bearing to the frame and allowing the bearing to be fixed in various positions relative to the frame, a hoist supported by the frame, and a load engaging mechanism which is raised and lowered by the hoist.

Abstract: A new Foldable Laundry Cart for offering a convenient means for storing, transporting, and folding laundry. The inventive device includes a frame assembly having an opening therein, a basket fitted within the opening of the frame assembly, and first and second leg assemblies pivotally attached to opposite ends of the frame assembly, wherein the leg assemblies are foldable toward each other to a horizontal position adjacent the underside of the frame assembly whereby the cart can be easily stored when not in use. A tray assembly is swivelly attached to the frame assembly above the opening and a handle assembly extends from each end of the frame assembly wherein the handle assembly is adapted for use as a handle and a clothes hanging device.

Abstract: A suspension system for the ground engaging powered and/or caster wheels of a power wheelchair utilizes three links, two of which are universally pivotally connected between the frame of the wheelchair and a wheel mounting transaxle housing or subframe so that the wheels can tilt relative to the frame of the wheelchair in a vertical plane. A third link is connected between the vehicle frame and the wheel mounting structure which can only pivot in a vertical plane, thus restraining the wheels from any lateral displacement relative to the vehicle frame. Fluid cylinders operable between the links and the vehicle frame provide cushioning of the frame and also, by subtraction of fluid from the fluid cylinders, can lower the entire frame of the wheelchair relative to the ground engaging wheels to permit the wheelchair and occupant to drive into the side door opening of a conventional van.

Abstract: A container (10) is disclosed having a pair of spaced apart flanges (28, 29) through each of which a J-shaped slot (30) extends. Each slot (30) has an inboard end (32) proximate the vertical centerline of the container and an outboard end (34) positioned a greater distance from the centerline. A wheel assembly axle rod (52) extends through the slots (30) and wheels (46, 48) are affixed to opposite ends of the axle rod. The axle rod (52) moves between the inboard end (32) of the slot wherein the wheels (46, 48) lie within the footprint of the container sidewalls (12) and the outboard end (34) of the slot wherein the wheels (46, 48) project rearward beyond a rearward sidewall (19) of the container.

Abstract: A motor vehicle for carrying a load over a street has in a preferred embodiment a bottom platform for supporting the load, a frame, disposed above the bottom platform and mounted to it, for providing structural integrity to the vehicle, a plurality of wheels rotatably mounted to the frame, and a door arrangement disposed on a side of the vehicle. In further embodiments, the wheels are retractable, so as to permit the bottom platform to approach the street level to facilitate loading and unloading of the vehicle. Additionally, the door arrangement includes a large doorway and a plurality of doors, each door slidably mounted, and all doors are movable to an open position located near an end of the vehicle to expose the large doorway to facilitate loading and unloading of the vehicle.

Abstract: A ground-loading conveyance for refuse or heavy objects. The frame is tipped with the handle to allow a two wheel carriage on pivoting support legs to swing beneath the frame, so as to support the load for transporting.

Abstract: A new and improved spare tire and axle system for a trailer, comprising a spare tire, rim and hub assembly with an attachment plate secured thereto for coupling to a trailer. A handle raises the assembly and attachment plate to a storage position and lowers the assembly to an operative position. Locking components secure the assembly and attachment plate in one position or the other.

Abstract: The present invention is a physical therapy apparatus for someone who either is a paraplegic and cannot walk or has had hip surgery and therefore cannot put full weight on one or both his or her legs. The novelty is that by having an adjustable sling assembly, the amount of weight the person can put on one or both of his or her legs can be varied so that as the physical therapy apparatus is used which can be used in a manual stage of walking or in a motorized stage with varying speeds, the person can put varying amounts of weight on either leg and can adjust the amount of weight relative to either leg based upon the alternating jackscrew movements driven by a DC motor to raise or lower the sling assembly from various heights to the ground.

Abstract: A refrigerant container is provided having retractable wheels mounted to the container front and rear walls in adjacency to the first and second side walls, with the wheels arranged for latching in a raised and lowered orientation relative to the container structure.

Abstract: An improved snap-on height adjustment spacer clip is provided for height adjustment of wheeled frames including at least one ground-engageable wheel assembly. The snap-on clip includes a pair of mutually opposed, resiliently spreadable arms integrally connected at one end and disconnected at the opposite end. The clip arms are sized for embracing the spindle portion of the wheel assembly when installed, and are sized to permit the arms to yieldably flex toward and away from one another as the spindle passes transversely between the arms during installation and removal of the clip. The clip preferably includes a pair of mutually opposed, resiliently compressible hand knobs for use in clip installation and removal.

Abstract: A multi-terrain in-line skate chassis has at least one base plate for supporting a skate boot and a single, vertically oriented wheel support plate having an upper edge. The base plate has a side edge and defines a base plane, and the upper edge of the wheel support plate is joined to the base plate along the side edge. The wheel support plate defines at least a first set of apertures and a second set of apertures. The first set of apertures is located at a first set of predetermined distances below the base plane. The second set of apertures is located at a second set of predetermined distances below the base plane, the second set of predetermined distances being different from the first set of predetermined distances.

Abstract: A cooler container having a rectangular configuration, each lower corner of the container having a recess. Also provided is a lid with a hinge. A latch is secured to the lid and side wall opposite from the hinge.

Abstract: An adjustment device for a roller skate including a support for an item of footwear and at least two aligned wheels. The device has the peculiarity of having, between the at least two aligned wheels, a screw for adjusting the interspace therebetween, as well as kinematic systems for interconnection with the support. The device allows to vary the distance between the support for the item of footwear and the axle of one or more of the aligned wheels of the skate.

Abstract: A carrier for an object having castors at each corner and a steering system comprised of a fixed pair of spaced steering wheels deployable to contact the surface proximate the midpoint of the carrier. The pair of steering wheels are separated by a distance that improves tracking of the carrier and allows the carrier to more easily be turned around corners. A linkage is connected between a foot pedal and the pair of steering wheels; and the pair of steering wheels is moved into surface contact simultaneously with said castors contacting the surface by pressing the foot pedal.

Abstract: Lawn mower height-adjust systems include three embodiments. Two permit the user to adjust the position of the deck relative to each wheel individually. The third permits the user to adjust the positions of all four wheels simultaneously, aided by a counterbalance system. A modification of the third embodiment is available to automatically bypass the height-adjust mechanism in the event an abnormally high load is placed on the deck. One of the two individual systems permits an operator to adjust the position of a respective wheel simply by removing a single nut and washer from an axle bolt. The second individual height-adjust system permits the operator to adjust the height of an individual wheel by using one hand, and without having to disassemble the mechanism. The system which adjusts all four wheels simultaneously links front and rear axle subassemblies with a connecting rod, and indexes all four wheels simultaneously through a release handle which is recessed in a cavity formed in the lawn mower deck.

Abstract: A dolly structure mounted at each end of a display rack is disclosed. It has, at each end of the rack, a pair of flat frames removably fixed to a vertical shelf post in a manner such that the two flat frames are aligned and coplanar. A pair of caster assemblies are mounted on the outer side members of the frames, outwardly of the base of the display rack. Each assembly has a caster which is movable between a low and a high position such as to allow lifting of the rack from the ground when it is intended to displace it.

Abstract: A power supplying accessory that can readily be retrofitted to an unpowered skateboard includes a leaf spring having a front end and a rear end; the front end including holes sized and spaced to fit on the threaded fasteners that attach the rear truck to the body of the skateboard; the leaf spring being secured between the rear truck and the body of the skateboard; the rear end of the leaf spring being attached to a drive assembly that includes an internal combustion engine, a drive wheel and a speed reducer; the leaf spring, in its unloaded condition, holding the drive wheel below an imaginary ground plane tangent to both the front and rear wheel of the skateboard, so that when the skateboard is loaded, the leaf spring preloads the drive wheel against the ground while the use of the rear truck of the skateboard permits the skateboard to retain its steering characteristics, thereby making it easy to learn to use.

Abstract: A materials handling vehicle or fork lift truck may be equipped with either cushion or pneumatic tires. When converting the vehicle from cushion to pneumatic tires, the front axle is moved downward and the mast assembly is moved forward to provide adequate clearance. The rear axle is also moved downward and backward. Changing configurations requires the addition of only one component; all of the other axle mounting hardware can be either repositioned or its orientation reversed in order to accommodate the change.

Abstract: A closeable container-type cargo holder is designed to be stackable, one on top of another, on board ships or other transportation devices. The cargo holders are also designed to be transferred between shore and ship by lifting equipment and transported to their intended destinations on land after unloading. A set of wheels are located in the rear section of the cargo holder between the rear doors of the cargo holder and a rear loading opening. The wheels are movable between a storage position above the bottom extreme of the cargo holder and a driving position below the bottom extreme of the cargo holder. The wheels are designed to be movable between the storage position and the driving position as the cargo holder is loaded or unloaded for transport. The front of the cargo holder includes a coupling device for connecting the cargo holder to a haulage vehicle for transport over land.

Abstract: A walker has a basket, a handle for use in pushing the walker along an upwardly facing surface and a plurality of legs connected to the basket and to the handle. The legs have lower ends, and a wheel and a braking element are associated with the lower end of each leg. A braking mechanism is provided for automatically actuating the braking elements and causing same to engage the upwardly facing surface if a predetermined weight is applied to the handle or to the basket, thus to stop the walker. The walker also has a manually operable brake system whereby the user can deliberately bring the walker to a stop.

Abstract: A child support apparatus for use as a safety car seat, stroller, highchair and crib. The apparatus has telescoping legs with retractable wheels and pivotable handles which may be extended to function as a stroller or retracted and pivoted to become a safety car seat. The apparatus has a restraining tray assembly adapted to receive a safety harness to provide an auxiliary safety feature that may be utilized if the harness is not fastened or accidentally comes loose from its normal male-female mating machanism. The trays associated with the restraining tray assembly are adjustable and rotatable to provide access to the unit's seat or as an extension for the apparatus' side arms when the unit is used as a crib. The retractable wheels are adapted with telescoping legs which may be extended to allow the unit to function as a highchair.

Abstract: A lawnmower has a series of openings in the housing into which wheel axles may be selectively engaged to adjust the cutting height. The axle ends are grooved, and the housing provided with a slot into which a clip is insertible to coact with the groove and retain the axle in position.

Abstract: A toy vehicle with pivotal axle wherein the axle is made in the form of a stirrup having two spaced bearings for a supporting shaft upon which the wheels of the vehicle are mounted and in which the stirrup is selectively seated within a notch or slot made in lugs depending from the vehicle chassis with the stirrup being retained against the walls defining the notch or slot by a yieldable retaining member which also depends from the chassis thereby the axle and vehicle wheels may be vertically adjusted relative to the chassis.

Abstract: A wheel cradling assembly includes a self-locking and self-unlocking actuator assembly associated with each of four dolly wheels, each actuator assembly having a roll-over pivot gear for moving an associated dolly wheel spindle between released and actuated positions. A gear lock either allows or prohibits rotational motion of the roll-over pivot gear in accordance with the pivotable position of the gear lock, and a spindle retainer automatically engages and releasably locks the dolly wheel spindle whenever the spindle is moved to the actuated position by the gear. The dolly assembly also includes a pair of cross arm assemblies extending transversely between a pair of dolly wheel carrying base assemblies for surrounding a pair of coaxial wheels of a towed vehicle.

Abstract: A row crop cultivator particularly adapted for ridge-hill and minimum tillage farming conditions. The cultivator carries a number of tools including spaced hilling disks, a coulter wheel and a sweep for effectively pitching soil and cutting crop residues and weeds between the planted rows. A gauge wheel assembly is provided for controlling the depth of penetration of the tools into the soil. The gauge wheel assembly includes a pair of elongated arms pivotally connected between a pair of parallel plates on the cultivator frame. Series of vertically spaced adjustment holes are formed in the plates and a pin member is selectively insertable in any aligned pair of holes to limit pivotal movement of the gauge wheel arms the elevation of the gauge wheel relative to the frame. The gauge wheel adjustments are easily made by hand in the field without the use of tools.

Abstract: A roller skate undercarriage including a roller carrier having three or more pairs of rollers attached by screws to the upper structure of a roller skate or to the blade of an ice skate. The carrier has holes, one group of holes at the front, one group of holes at the rear and one hole between the front and rear groups to hold roller hubs. The center axes of the holes in the carrier and of the axle pins inserted through them are staggered with respect to the central axes of the roller hubs mounted on the axle pins so that the height of the rollers may be changed with respect to the roller carrier by turning the roller hubs. In this way the roller skate can be individually adapted to the user and the purpose of use.

Abstract: A lawnmower comprising a mower deck carried by four wheels positioned in laterally opposed pairs, with the forward wheels being adjustable for selecting mowing height. A pair of longitudinal blades are carried at the forward edge of the deck and have respective arrays of blade teeth projecting forwardly of the deck. The lower blade is affixed to the deck and the upper blade is coupled by a bell crank and a pitman drive to the output shaft of an engine for reciprocating the upper blade over the lower blade and thereby scissoring the respective blade teeth arrays. A guard shell is carried by the mower deck enclosing the mower blades and has vertical slots in the forward shell wall for receiving and combing grass to positions among the mower blade teeth. A blower is coupled to the shell for assisting such combing action and for removing clippings from the shell enclosure. The shell slots are dimensioned to prevent entry of rocks, tree trunks and human limbs.

Abstract: A load carrying unit includes a load carrying portion having a pair of wheels lockably raisable and lowerable in relation thereto. The load carrying portion may be connected to a vehicle by means of a standard ball-and-socket hitch used in conjunction with a cantilever arm. Once the hitch and arm have been connected to the vehicle, the wheels may be raised and the load carrying portion slid toward the vehicle to reduce the cantilever stress on the arm. The load carrying portion and the vehicle may be driven as though there were no trailer.

Abstract: A gauge wheel arm pivotally connected to an implement frame carries a first slotted plate, and a second slotted plate is fixed to the frame with the slots of the respective plates overlapping to receive a single bolt at the area of overlap. The slots, which provide for continuous adjustment of the arm, are angled with respect to each other to provide a scissors- or ramp-type action on the bolt which positively fixes the arm relative to the frame.

Abstract: There is disclosed an improved wheel housing assembly comprised of a wheel, a wheel axle and an axle housing wherein the wheel axle is formed of wheel and housing shaft portions with the axis of the wheel shaft portion being parallel to and slightly displaced or offset from the axis of the housing shaft portion whereby rotation of the housing shaft portion within a housing member permits the wheel shaft portion to be rotated about the axis of the housing shaft portion thereby to permit elevational adjustment of the wheel of the wheel assembly with respect to the horizontal.

Abstract: The tractor has a main frame, supported by a pair of steering/driving wheels, to which is fitted the engine and transmission. A pair of booms are pivotally mounted on the frame (or on a sub-frame pivotally connected to the frame) and are provided with castor wheels. The track between the castor wheels is selectively adjustable by hydraulic rams connected to the booms and the frame (or sub-frame). Agricultural implements may be connected to the frame, to the booms inside the wheelbase of the tractor or to a draw-bar interconnecting the booms.

Abstract: An improved movable load carrying device for vehicles with cargo space is disclosed. Such load carrying devices render possible loading and unloading operations from three sides and with suitable working positions of the operator, but on the other hand it was found, that the inward as well as the outward movement of known load carrying devices into and, respectively, out of the cargo space of a vehicle are troublesome and require relatively great exertion and often even heavy lifting, which to some extent takes away the advantages with respect to loading and unloading. In order to eliminate these and other disadvantages, according to the present invention a movable load carrying device is proposed the load table of which is formed on its lower surface with guide grooves for a pair of carrying rollers.

Abstract: A folding boom construction comprising a wheeled frame, a boom disposed transversely of the wheeled frame, the boom being adapted to support one or more cultivating tools, the boom being coupled to the wheeled frame to be rotatable about a substantially transverse axis of the wheeled frame, the boom being rotatable about an axis transverse of the boom such that on rotation about the axis transverse to the wheeled frame the cultivating tools can be raised or lowered from the ground and when the tools are in the raised position the transverse axis is substantially upright such that the boom can be swung from the transverse position to a fore-and-aft position.

Abstract: An adjustable axle support system for a lawn mower for supporting the whe and blade housing at a preselectable elevation in accordance with a desired cutting height of the grass cutting blade which is rotatable in a horizontal plane within the blade housing of the mower. The system includes brackets fixed to the opposite ends of the front and rear sections of the blade housing with the axles received in vertical slots formed in the brackets. Axle bearings are slidable on the axles for receipt in enlarged openings formed along the slots in the brackets. The axle bearings are biased into the selected enlarged openings by coil compression springs received about the axles. Adjustment of the height of the blade housing and in turn the cutting blade is achieved simply by retracting the bearings along the axles against the bias of the springs and moving the axles along the slots in the brackets into the desired elevation and then placing the bearings into the appropriate enlarged openings along the bracket slots.

Abstract: A wheel for a lawn mower, or the like, is positioned on an axle. The axle has a detent groove formed in it. A chassis for the axle has two spaced apart walls with aligned sets of holes into which sets of holes the axle may be selectively inserted to adjust wheel height. A detent spring formed at one of the walls resiliently self-biases to engage in the detent groove in the axle to hold the axle in place. A cutout in that wall holds the detent spring and enables it to resiliently self-bias into the groove in the axle.

Abstract: The rear wheels of a walk-behind, self-propelled lawn mower are fixed to the opposite ends of a drive axle that is rotatably mounted in an axle support frame. The axle support frame is vertically pivotally mounted at the rear of a main frame of the mower and an adjustment mechanism is provided for holding the support frame in selected positions according to the cutting height desired. A cross-shaft is coupled to be driven from the mower engine and is mounted in the support frame, so as to extend along the axis about which the latter is pivotable, and is connected to the drive axle by gearing. A normally disengaged clutch is carried by the cross-shaft for selective engagement to complete a drive connection to the gearing. The drive axle support frame defines a protective guard or shield which extends over the clutch and gearing.

Abstract: A foldable, storable utility trailer, said trailer having a pair of retractable wheels, a foldable tow bar, and a removable cover which also serves as a storage receptacle when the trailer is not in use. The trailer is constructed in a simple manner so as to provide compactness, ease of operation, and reliability.

Abstract: An apparatus for compacting subgrade and pavement materials during a road building operation, and which is characterized by the ability to selectively perform a plurality of distinct road rolling functions to thereby facilitate a road building operation. The apparatus is self-propelled and includes compacting means which comprises a pair of steel cylindrical rollers and two sets of rubber wheels having overlapping tracks. Provision is made for selectively moving the sets of rubber wheels into and out of operative engagement with the ground, whereby selective compaction by the independent operation of either the steel cylindrical rollers or the rubber wheels may be effected, and without simultaneous operation by the non-operating compacting means. A unitary steering system is also provided whereby the direction of the apparatus may be controlled when either compacting means is in operation.

Abstract: A trolley comprising a substantially rectangular support framework and wheels mounted on one end of support arms, the other ends of the arms being pivoted to the framework and the arms being movable to several positions so that the trolley can be used for different purposes.

Abstract: A trailer having a tiltable bed and a wheel-supported undercarriage is provided with structure mounting the undercarriage for reciprocal movement fore and aft of the bed between a forward, bed-tilting position and a rearmost, roading position wherein the bed is carried lower to the ground to accommodate higher loads. The mounting structure includes a pair of tracks on the bed and a series of ramps for raising the bed relative to the undercarriage when the latter is shifted from its roading position such that sufficient spacing between the bed and the undercarriage is provided for clearance of the bed understructure during movement of the undercarriage along its fore and aft path of travel.

Abstract: A rigid, generally rectangular seat has front and rear leg assemblies pivotally connected thereto, so that the seat can be folded upwardly toward the rear leg assembly, and the front leg assembly can be folded beneath the seat. A pair of L-shaped arms is pivotally mounted on the rear leg assembly, one on each side, and the lower ends of the generally vertical portions of said arms are alignable with the front leg assembly when the chair is erect, and carry locking means thereon engageable with a locking means carried by the upper ends of the front legs. The L-shaped arms hold the chair in its erect position, but either can be released and swung aside to allow sideways movement of a person entering or leaving the seat.

Abstract: Wheel assembly for a container or suitcase comprising a wheel casing adapted to be secured in the container or suitcase and a wheel mounted in a rotatable wheel fork which is movably disposed in the wheel casing so that the wheel can be moved between a parking position in which only a small portion of the wheel projects beyond the wheel casing and a wheeling position outwardly of the casing, the wheel fork being rotatably mounted in a bearing block which is disposed in the wheel casing to be displaceable between an inner and an outer position in which latter position it can be pivoted in the plane of the wheel casing.

Abstract: A portable, self-contained tennis ball throwing apparatus is disclosed which includes a constantly rotating cam having gradually increasing radii of successive points around its periphery and an abrupt transition from a maximum radius to a minimum radius, a pivotally mounted throwing arm having one end biased into contact with the periphery of the cam and supporting a ball receiving cup at its other end, and a resilient member for biasing the throwing arm, such that the cam effectively cocks the throwing arm at a relatively slow rate and releases the throwing arm to move under the influence of the resilient member to impart a throwing force to a tennis ball. The housing of the apparatus is mounted on a carriage which is movable with respect to the housing to change the pitch angle thereof, and, therefore, the angle of trajectory of a thrown ball. The ball receiving cup is also adjustable to change the angle of trajectory of the thrown ball.

Abstract: Cutting height adjustment device for lawn mower blades: adjustment is obtained by adjusting the height of the mower wheel axle with respect to the mower chassis; the wheel axle is carried on a crank arm which pivots about a shaft fixedly positioned with respect to the chassis; the shaft is pivotable to a plurality of angular positions; a detent disc is secured to the shaft; a latch, non-shiftable with respect to the chassis, is operable to selectively engage in and disengage from the detents, thereby to position the blades at various heights; a pointer associated with and movable with the shaft indicates blade height on a scale on the chassis.