Abstract: A height adjusting device includes an attachment bolt, an adjuster, a female screw portion, and a circular groove. The adjuster includes a flange portion operable from an outside and is fixed to the attachment bolt so as to be rotatable integrally with the attachment bolt. The female screw portion is formed in a piece of furniture. The attachment bolt is screwable into the female screw portion. A circular groove is formed around the female screw portion. The adjuster includes a brake portion protruding from the flange portion in a rotation axis direction of the adjuster. When inserted into the circular groove, the brake portion abuts a wall surface of the circular groove and is at least partially deformed thereby to bias the wall surface, resulting in suppression of rotation of the adjuster.

Abstract: Castor wheel assembly including a castor pin having a castor axis; a yoke mounted to the castor pin—and rotatable about a yoke axis; a castor wheel rotatably mounted to the yoke about a wheel axis; and a gradient device disposed between the castor pin and the yoke. The gradient device is operative to allow angular displacement of the yoke axis relative to the castor axis.

Abstract: The present invention is directed to a trailer comprising a platform supported by a hitch assembly and at least one translatable wheel assembly. The hitch assembly is for rigid attachment to a vehicle. The translatable wheel assembly can adjust in position beneath the platform to position the wheel to balance the weight distribution of cargo supported on the platform thereby providing minimal downward force to the vehicle through the hitch assembly. The translatable wheel assembly may adjust beyond the length of the platform where the wheel assembly may further collapse and extend to allow the platform to be raised and lowered to the ground.

Abstract: An invention is provided which comprises a welding carriage having a base, rear wheel assemblies disposed at one end of the base, a first front wheel assembly attachment member disposed on a second side of the base, and a first front wheel assembly configured to removably engage with the front wheel assembly attachment member to securely couple with the base. The welding carriage may also include a second front wheel assembly attachment member disposed on a second side of the base, and a second front wheel assembly configured to removably engage with at least the at least one front wheel assembly attachment member to securely couple with the base. The carriage may also include at least two welding attachment portions, where both welding attachment portions have the same cross-sectional characteristics.

Abstract: An apparatus for supporting an object includes a base assembly and at least three wheels pivotally attached to the base assembly. A pivot arm includes a flange plate at an upper end for attachment to the object. An opposite lower end of the pivot arm includes a universal joint for pivotal motion about two perpendicular axes that is attached to the base assembly. A brake assembly is attached to the pivot arm. The brake assembly includes a first disengaged position and a second engaged position that is latched. When the brake assembly is in the second position, a brake pad is forced downward below a level of a surface and into frictional engagement with the surface. More than one apparatus can also be attached to an adapter plate to provide greater floatation. Pivotal attachment to a support beam is also described.

Abstract: The invention relates to a swivel wheel (10) with suspension (14), comprising a wheel frame (11), a wheel element (12) able to turn about a horizontal wheel axle (13), a suspension (14) and an arm (15). At one end the arm (15) is attached to the wheel frame (11) such that it can pivot about a horizontal arm axis (17) and at the other end it supports the wheel axle (13) some distance away from the arm axis (17). The suspension (14) engages on the arm (15) at an arm engagement point (18) and on the wheel frame (11) at a frame engagement point (19). The arm engagement point (18) and the frame engagement point (19) define a straight suspension axis (20) running through these points. The wheel furthermore has an adjustment mechanism (30) that is equipped for setting the distance (D) from the suspension axis (20) to the arm axis (17) by moving the arm engagement point (18) and/or the frame engagement point (19) along an adjustment track (31).

Abstract: A sheet feeding device is adapted to be placed beside a sheet processing apparatus by being lifted on a side close to the sheet processing apparatus for engagement with the sheet processing apparatus. The sheet feeding device includes a housing, casters, and an elastic member. The housing stores therein sheets to be supplied to the sheet processing apparatus. Provided for supporting the housing, the casters are mounted on a bottom portion of the housing and include a first caster and a second caster. The first caster is located close to the sheet processing apparatus so as to be movable upward and downward. The second caster is located far from the sheet processing apparatus. The elastic member applies a downward force to the first caster.

Abstract: A front wheel support for a wheel chair, the front wheel support having a curved tube for attachment to a frame member of the wheel chair and a curved part. The curved part has a first portion with a curvature identical to the curvature of the curved tube, and a cross section allowing the first portion of the curved part to fit inside the curved tube. The curved part further has a second portion with a wheel fork seat for mounting a front wheel fork of the wheel chair.

Abstract: An improved wheel assembly comprises a caster fork, a caster wheel rotatably supported by the caster fork, and a caster swivel post defining an axis about which the caster fork rotates. The caster swivel post is being adapted to rotate about a pivot axis within a cylindrical housing. Alternatively, the wheel assembly has an adjustable axle for varying the camber angle of a wheel. The wheel assembly comprises a housing and an axle supported by the housing. The axle in turn rotatably supports a wheel. The axle is adapted to rotate about a pivot axis within a cylindrical housing.

Abstract: An adjustable caster comprising a reversible mounting bracket offering added flexibility in adjusting the height of the caster and configured to removably attach to a structure to be supported by the adjustable caster; an internally threaded sleeve mounted to and extending from the mounting bracket, the sleeve having proximal and distal ends and a sleeve axis extending there between; an externally threaded stem configured to be removably threaded into the sleeve at either the distal or proximal end; a caster wheel assembly attached to the stem; and an adjustment assembly operatively associated with the stem and fully accessible to a user of the caster when the caster is assembled and the mounting bracket is attached to the caster-supported structure, the vertical adjustment assembly configured to adjust the vertical displacement of the stem along the sleeve axis.

Abstract: A holographic wavefront sensor inclusive of a multiplexed hologram that can reconstruct one or more diffracted beams from a single object or input beam onto a distant image plane. The position of the reconstructed beams on the distant image plane indicates the relative amounts of different aberrations present in the input beam. Optical and computer realization of the employed hologram are accomplished along with sensor configurations in simple and more complex uses.

Abstract: A stroller includes a main frame, a pedal, a front wheel frame, and a positioning device. The positioning device includes a lower cover, an upper cover, a rotation knob, and a locking rod. Thus, the front wheel frame is locked to and unlocked from the main frame by moving the drive plate of the rotation knob, so that the positioning device is operated easily and rapidly. In addition, when the positioning device is unlocked, a click sound is produced so as to notify the user that the positioning device is unlocked and the front wheel frame is rotatable relative to the main frame freely, thereby facilitating the user judging the state (locked or unlocked) of the front wheel frame.

Abstract: An improved wheel assembly comprises a caster swivel post that is adapted to pivot about a pivot axis transverse to the caster swivel post. A caster fork is supported for rotation relative to the caster swivel post and rotatably supports a caster wheel. The caster swivel post is adapted selectively pivot about the pivot axis that is transverse to the caster swivel post or be held in a substantially fixed position. A setscrew can be threadable into an upper end of a pivot nut to hold the pivot nut and thus the caster swivel post in a fixed position within the housing.

Abstract: A fluid levitating caster lifts a heavy load “(17)” off a floor “(18)” with near friction-less-ness for transport has integrated a load lifting device. This extra rise height “(ER)” lifting feature accommodates moving loads “(17)” which have flexible-sagging frames, over uneven floors “(18)”, and which have frames that are not parallel to floor “(18)”. An inflatable bellows “(22)” design of the load lifting device receives its pressurization from fluid levitating caster, and additionally serves as a dampening reservoir to reduce hopping-pressure surges inherent in fluid levitating casters.

Abstract: An apparatus for supporting an object includes a base assembly and at least three wheels pivotally attached to the base assembly. A pivot arm includes a flange plate at an upper end for attachment to the object. An opposite lower end of the pivot arm includes a universal joint for pivotal motion about two perpendicular axes that is attached to the base assembly. A brake assembly is attached to the pivot arm. The brake assembly includes a first disengaged position and a second engaged position that is latched. When the brake assembly is in the second position, a brake pad is forced downward below a level of a surface and into frictional engagement with the surface. More than one apparatus can also be attached to an adapter plate to provide greater floatation. Pivotal attachment to a support beam is also described.

Abstract: The present invention provides a stable tripod stand for sensitive optical devices such as telescopes and the like. The tripod may be moved around on wheels which are coupled to casters and when positioned may be secured to the ground to provide an adjustable and highly stable support that significantly reduces the incidence of jitter. The tripod includes a stabilizer member that extends through the casters to selectively engage the ground. The leg members of the tripod have a triangular shape and support links between the platform and the leg members form interlocking triangular supports which reinforce the leg members.

Abstract: A pneumatic locking swivel caster comprises a swivel caster and a locking device which may be activated by fluid pressure. The swivel caster may be a dual wheel swivel caster. An improved theatrical prop or scenery element comprises a pneumatic locking swivel caster and a control system. The control system may comprise a tank filled with pressurized air and a control valve. A pneumatic locking swivel caster may be locked into position by activating the control valve and pressuring the caster with air. The pneumatic locking swivel caster may comprise a triple swivel caster adapted such that all three sets of wheels are locked by air pressure.

Abstract: A bed frame includes a base frame, an articulated support decks, an intermediate frame positioned between the base frame and the articulated support deck, and an auto-contour mechanism. The articulated support deck includes head, seat and foot deck portions. When engaged, the auto-contour mechanism adjusts the elevation of the seat deck portion and the foot deck portion in response to an adjustment of the head deck portion. The auto-contour mechanism is easily engaged/disengaged by manipulating a control lever. The bed frame can include siderails which are provided with a latching mechanism. The bed frame can also include a caster assembly that allows casters to be pivoted in an engaged position in which the bed frame rests on the casters, and a disengaged position in which the bed frame rests on legs.

Abstract: A vertically adjustable bed includes a bed frame attached to movable legs powered by a motor. Operation of the motor causes the legs to move longitudinally along a guide rod, collapsing the legs beneath the bed and moving the bed frame vertically. Collapsing the bed to its substantially lowermost position compresses a spring. The energy stored by the compression of the spring is used to raise the bed from its substantially lowermost position. Pivotally attached to the legs is a caster and foot arrangement. During normal operation, the foot engages the floor. When the bed frame moves to its substantially uppermost position, a pin extending from the leg engages one end of a slot, causing the caster to pivot and engage the floor, rendering the bed horizontally mobile.

Abstract: An adjustable eccentric axle caster assembly for a pallet truck is provided. The adjustable caster assembly includes an eccentric axle, a caster wheel mounted on the eccentric axle, and a fastener for securing the eccentric axle to provide a desired caster wheel position. Additionally, a method of adjusting the eccentric axle caster assembly is provided.

Abstract: A pair of substitute adjustable height wheel assemblies 10 10 to replace either the front 101 and/or rear 102 wheel assemblies on a conventional lawn mower 100 wherein each adjustable height wheel assembly 10 includes a contoured mounting plate member 20 having a central portion 21 adapted to be secured at a desired location on the lawn mower housing 103 and including a pair of outwardly projecting leg portions 22 23 having a plurality of vertically spaced aligned apertures 24 dimensioned to selectively receive a securing unit 12 for positioning an adjustment arm unit 13 bearing a castor wheel unit 14 at a desired height relative to the mounting plate member 20 that is selectively positioned on the lawn mower (100).

Abstract: The caster leg assembly has a slidable collar mounted on a shank that is threaded onto a stud fixed within a hollow table leg. A resiliently deformable ring is positioned between a shoulder on the shank and an inwardly turned end of the leg. A locking nut is threaded onto a threaded portion of the collar to abut the inwardly turned end of the leg. After the shank has been adjusted along the length of the stud, the locking nut is threaded against the end of the leg to cause the collar to be drawn in a direction out of the leg thereby compressively deforming the ring to frictionally engage the collar and leg. This, in turn, locks the shank against rotation relative to the leg.

Abstract: A method and apparatus for appliance installation and leveling using a leveling caster. The leveling caster includes a top shelf connected to wheels by a scissors type structure. The height of the scissors type structure can be adjusted using an adjustment bolt from the front of the appliance, without requiring access to the rear of the appliance. The leveling caster is adjustable over a wide range of heights, is strong enough to bear heavy appliances, and allows height adjustment while minimizing incidental horizontal motion.

Abstract: A wheel device for a stroller comprises a supporting seat, a swivel wheel frame assembly penetrating the supporting seat, and a sliding member provided on the upper surface of the supporting seat. By sliding on the upper surface of the supporting seat, the sliding member can be served to adjust the position of the pin so as to switch the swivel wheel frame assembly between the states of fixation and rotation and is of the functions of fixing the wheel in a predetermined direction and quick release.

Abstract: A height adjustable support is provided for supporting food service equipment and the like at different elevations above a supporting floor. The support comprises a floor engaging member such as a leg or caster that has a threaded upright stud and a coupling having an internally threaded tubular wall threaded thereon. The support also has at least one set screw threaded channel that extends through the tubular wall and a set screw sized to be threaded through the coupling set screw threaded channel and into setting engagement with the stud. So constructed the coupling may be inserted into a bottom channel of the food service equipment with the floor engaging member stud threaded therein and set at a selected position thereby setting the equipment height.

Abstract: An adjustable eccentric axle caster assembly for a pallet truck is provided. The adjustable caster assembly includes an eccentric axle, a caster wheel mounted on the eccentric axle, and a fastener for securing the eccentric axle to provide a desired caster wheel position. Additionally, a method of adjusting the eccentric axle caster assembly is provided.

Abstract: Front wheel support for a wheel chair, said front wheel support comprising a curved tube for being attached to a frame member of the wheel chair and a curved part. The curved part has a first portion with a curvature being identical to the curvature of the curved tube, and a cross section allowing the first portion of the curved part to fit inside the curved tube. The curved part further comprises a second portion with a wheel fork seat for mounting a front wheel fork of said wheel chair.

Abstract: A furniture article of improved construction includes a furniture frame having a portion that is receptive of a bracket having a configuration that enables attaching a leg thereto in an adjustable way. Each of the legs that attaches to the furniture frame attaches to a single of the brackets. A plurality of the brackets can be attached to the frame. Each of the brackets has a slot that receives a connector (e.g. internally threaded nut), the connector traveling in the slot between inner and outer positions. A user can select the position of a leg relative to the furniture frame by attaching the leg to the nut using a threaded fastener for example, and sliding the nut and leg relative to the bracket and frame until a selected position is reached. Further tightening of the leg relative to the nut and bracket affixes the position of the leg relative to the article of furniture in the desired position.

Abstract: The present invention is directed to a caster assembly for supporting an object. The assembly includes a caster wheel, a support member rotatably supporting the wheel and first and second side support pieces mounted on the support member. The support member includes a base support surface for engaging and supporting a bottom surface of an object. The first side support piece includes a first support surface adapted to engage and support a first side surface of the object. The second side support piece includes a second support surface adapted to engage and support a second side surface of the object. At least one of the side support pieces is slidably mounted on the support member and is adapted to be moved relative to the other side support piece to permit adjustment of a distance between the between the first and second side support surfaces to accommodate objects of different widths.

Abstract: A method and apparatus for appliance installation and leveling using a leveling caster. The leveling caster includes a top shelf connected to wheels by a scissors type structure. The height of the scissors type structure can be adjusted using an adjustment bolt from the front of the appliance, without requiring access to the rear of the appliance. The leveling caster is adjustable over a wide range of heights, is strong enough to bear heavy appliances, and allows height adjustment while minimizing incidental horizontal motion.

Abstract: A one-piece caster and leveler assembly to aid in the transportation and installation of equipment that combines a leveler with a rotable foot and a wheel chassis. During movement of the equipment, the leveler may be placed in a retracted position where the rotable foot contacts and pitches away from the wheels, and rotates as the direction of movement changes, providing improved clearance, load capacity and tolerance for striking obstacles.

Abstract: The present invention is directed to a caster assembly for supporting an object. The assembly includes a caster wheel, a support member rotatably supporting the wheel and first and second side support pieces mounted on the support member. The support member includes a base support surface for engaging and supporting a bottom surface of an object. The first side support piece includes a first support surface adapted to engage and support a first side surface of the object. The second side support piece includes a second support surface adapted to engage and support a second side surface of the object. At least one of the side support pieces is slidably mounted on the support member and is adapted to be moved relative to the other side support piece to permit adjustment of a distance between the between the first and second side support surfaces to accommodate objects of different widths.

Abstract: A caster block for receiving a caster wheel for a wheelchair, in which a housing defines a central bore and spaced-apart bores for bolts to connect the caster block to the wheel chair. A resilient core in the central bore defines recesses in opposing distal ends for bearing races. A shaft of a caster wheel extends through the core. A wheel lock for restraining a wheel on the wheel chair has a bottom plate with a flange extending to one side to define a recess between an accurate cavity and a mounting block. An edge of a top plate matingly engages the cavity. The top and bottom plate sandwich a frame member. A handle with a lock arm pivotally connects to the bottom plate. A pin extends from the lock arm, and engages a wheel upon movement of the handle, to secure the wheel from rotation.

Abstract: A wheeled leveling device is provided that includes a cabinet bracket, a wheel assembly, and an adjustment screw. The cabinet bracket includes a pair of slots that include detent portions. The wheel assembly includes a roller rotatably secured to a wheel assembly bracket. A pair of rockers secured to the wheel assembly bracket slide into and engage with the slots of the cabinet bracket. The rockers pivot about the detent portions of the slots such that the wheel assembly does not disengage. The adjustment screw passes through a hole in the cabinet bracket and a hole in the wheel assembly bracket and engages with a threaded fastener secured to the wheel assembly bracket. Turning the adjustment screw causes the wheel assembly to pivot about the detent portions of the slots of the cabinet bracket, thereby raising or lowering the roller and hence altering the height of the appliance.

Abstract: A castor assembly comprises stem (2) which is adapted at the upper end (4) thereof to be connected to the base of a structure to be supported, a foot (5), a castor body (3) swivellably mounted on the stem (2), a castor wheel (12) carried by the castor body, the rotational axis (13) of the castor wheel being offset from the axis of the stem to provide castoring, and a thrust bearing (19) positioned at the upper end of the castor body. The foot (5) is carried by the lower end of the stem (2), which is adjustable threadedly engageable with a threaded bore in the base whereby adjustment of the stem upper end (4) causes the foot to be raised or lowered relative to the base. The castor body (3) is capable of vertical movement relative to the stem (2), and the thrust bearing (20) bears the vertical load acting between the castor body and the base when the foot (5) is lifted clear of the floor and the castor wheel is supporting the structure.

Abstract: In a caster which supports a wheel by using via a link 3 a bracket 2 to be fitted to a wheelchair or the like, an end of the link 3 is connected with a rotation axis of the bracket 2 via a rubber member 8 which is twisted and deformed resulting from oscillating motion of the link 3, and the link 3 and the bracket 2 are connected by a hydraulic damper 20 which damps the oscillating motion of the link 3, whereby an oscillation or a shock can be absorbed.

Abstract: A closure assembly including an outer and an inner frame (11.16); and a frame hinge (23) including a first frame hinge member having a generally cylindrically shaped bead associated with one of said frames and a second frame hinge member having a complementary socket associated with the other of said frames, at least one frame includes a flange spaced apart from the frame hinge member associated with the at least one frame to cooperate with said frame hinge member to prevent disengagement of said frame hinge member from the other frame hinge member in a closed condition. The assembly also includes a latch (60) hingedly mounted on the outer frame by a hinge having a generally cylindrically shaped bead associated with the latch and a complementary socket associated with the outer frame, the latch including a latch flange spaced apart from the bead to cooperate with a flange (86) on the inner frame to prevent disengagement of the bead from the socket and retain the inner frame in a closed condition.

Abstract: A caster system wherein a constant force is applied to the caster for load support purposes. A plurality of casters are interconnected by a fluid conduit system and each caster includes an expansible chamber motor for adjusting the vertical position of the caster. A fluid pressurizing unit communicates with the conduits and an adjustable force compression spring selectively varies the biasing force on the piston to adjust the equal force imposed upon each caster wheel.

Abstract: The present invention is directed to a caster assembly for supporting an object. The caster assembly includes a caster, a caster axle and a pair of support pieces, at least one of the support pieces being rotatably mounted on the caster axle. The support pair of support pieces each include at least two perpendicular support surfaces thereby providing for a plurality of support configurations for supporting objects having various shapes.

Abstract: A heavy-duty caster of relatively concise configuration wherein a vertical kingpin interconnects the basic components, and the kingpin is vertically adjustable relative to its supporting structure to permit the vertical height of the caster to be readily varied.

Abstract: The present invention includes an adjustable-height castor assembly for use with racks such as racks used to house computer servers. The castor assembly includes a frame or housing which may be fastened to a bottom of a rack. The castor assembly further includes a threaded vertical shaft with a round member (e.g., a swivel wheel or sphere) attached to the lower end of the vertical shaft. The wheel may be directly attached to the vertical shaft or indirectly attached to the vertical shaft via a castor plate or other support structure. The vertical shaft extends through a tapped support in the frame such that rotation of the vertical shaft raises or lowers the frame along the vertical shaft. The castor assembly further includes a drive shaft having a drive gear. A mating gear is mounted on the vertical shaft. The mating gear and the drive gear mesh or interlock such that when the drive gear rotates, the mating gear rotates.

Abstract: The present invention relates a luggage case with reinforcing structure including a case body, four castors, four inner brackets, two pieces of the first tubes and two pieces of the second tubes, in which the inner bracket, the first tube and the second tube are joined together to reinforce the structural strength, capable of bearing heavier load. The luggage case so reinforcing still keeps the originally neat and good looking and maintains the storage capacity with no space reduced.

Abstract: A retractable caster system comprises a rectangular, steel box defining a chamber, a plurality of which may be attached to the bottom of a storage container to elevate the container above a surface upon which it rests. Inside the chamber, a caster is mounted to a hinged plate which pivots near the bottom of one sidewall of the chamber. The plate articulates between a substantially vertical position, with the caster fully retracted into the chamber, and a horizontal position with the caster wheel protruding beneath the chamber. A coiled spring biases the plate toward a vertical position, and an automatic locking mechanism holds the caster in its extended position. The caster may be raised and lowered without separately supporting the weight of the container.

Abstract: A caster supporting weight through a biasing device an elastomeric material, such as polyurethane, to elastomerically support the weight transmitted through the caster. The components are concisely related to each other, the elastic material is protected against damage, including excessive weight supporting forces, and in an embodiment of the invention, vertical caster adjustment is possible without affecting its elastomeric weight bearing characteristics.

Abstract: A retractable caster system comprises a rectangular, steel box defining a chamber, a plurality of which may be attached to the bottom of a storage container to elevate the container above a surface upon which it rests. Inside the chamber, a caster is mounted to a hinged plate which pivots near the bottom of one sidewall of the chamber. The plate articulates between a substantially vertical position, with the caster fully retracted into the chamber, and a horizontal position with the caster wheel protruding beneath the chamber. A coiled spring biases the plate toward a vertical position, and an automatic locking mechanism holds the caster in its extended position. The caster may be raised and lowered without separately supporting the weight of the container.

Abstract: A heavy duty vertically adjustable spring biased caster comprising a caster wheel mounted upon a pivot shaft within a frame. The pivot shaft is vertically adjustable upon the frame and a spring cradle mounted upon the wheel support pivot shaft and vertically adjustable therewith permits a uniform biasing force to be imposed upon the caster wheel support regardless of the vertical position of the caster wheel within the frame.

Abstract: The invention relates to a wheelchair having side frames including tube sections having a tube-bend at the front bottom end of each in an area proximate to where a bearing housing is mounted. The bearing housing has an approximately vertical bearing bore for accommodating an upwardly directed axle pin of a steering fork for holding a caster. The bearing housing also has an adjustment device, which is integrated in the screw mounting, for adjusting the bearing housing with respect to the side frame in order to align the bearing bore perpendicular to the ground. The bearing housing is mounted to the tube-bend via a guide passage of a clamping shell, which is correspondingly curved and is open on one side. The clamping shell is fitted laterally to the tube-bend and, is displaceably guided and is fixable in the desired position by tightening at least one clamping screw.

Abstract: A non-skid wheel brake mechanism includes a wheel body, a shaft part, left and right wheels each with a ring rim. The device includes an outer rim having an oval ring groove having upper and lower half portions. A substantially oval shaped shaft bore extends through the outer rim. A rim bore extends vertically through the outer rim to form an accommodating channel. The accommodating channel is in communication with the shaft bore. The ends of the wheel shaft is secured within the insert bores of the ring rims. An S-shaped spring plate is positioned inside the accommodating channel and extends into the shaft bore against the wheel shaft such that the ring rims are frictionally braked by the lower half portion of the oval ring groove.

Abstract: Drive wheel axle assemblies (34, 34A) and caster wheel assemblies (94, 252) are mounted to a wheelchair frame (4, 222). One axle assembly (34) includes an axle adjustment tube (40) secured to the frame and an axle housing (56), defining an axle bore (58), toollessly mounted to the axle adjustment tube at any of several rotary orientations to determine the camber of the drive wheel (36) mounted to the axle assembly. The front to rear position of the axle housing can also be adjusted in a toolless manner using a quick release pin (66). The height of the front end (10) of the frame is changed, to ensure that the caster wheel pivot axis (96) remains vertical, without tools by mounting a caster wheel (98) at various vertical positions within a caster spool housing (100) without exposing the user to oil and grease on the spindle (120) and bearings (121). Another axle assembly (34A) permits the height of the drive wheels (254) to be changed without the used tools.

Abstract: A retractrable wheel assembly for luggage cases includes an outer U-shaped member being rectangular in shape and having an open vertical side secured to a L-shaped bracket, an inner U-shaped member slidably fitted inside the outer U-shaped member, two springs connected between hooks of the outer U-shaped member and the inner U-shaped member, a wheel pivotally connected to a bottom of the inner U-shaped member, a positioner fixedly mounted within the inner U-shaped member, a V-shaped torsion spring having an intermediate portion fixedly mounted inside the positioner and two ends provided with two blocks configured to extend through the the openings of the positioner, the inner U-shaped member and the outer U-shaped member, and a string having an upper end extending out of the outer U-shaped member and a lower end engaged with the two ends of the V-shaped torsion spring.