Patent Description:
Patent No. <CIT> discloses a wheelchair with a pair of foot rest assemblies each including an adjustable foot rest supporting member the position and tilt of which can be adjusted. Further similar examples of wheelchairs or rollators including a pair of foot rest assemblies are disclosed in Chinese Utility Model Publication No. <CIT>, in European Patent Publication No. <CIT>, in International (PCT) Publication No. <CIT>, and U. Patent No. <CIT>.

In the accompanying drawings which are incorporated in and constitute a part of the specification, embodiments of the invention are illustrated, which, together with a general description of the invention given above, and the detailed description given below, serve to example the principles of this invention.

Described herein are various improvements to mobility devices. These improvements include, for example, adjustable lateral body supports, multi axial supports for accommodating movement of the pelvis during walking, frame folding assemblies for accommodating storage and transportation, detachable support couplings for supportive accessories, foldaway footplate assemblies for allowing users to rest, wheel brake systems, caster wheel systems, suspension support systems, control button assemblies, and center of gravity adjustment assemblies. One or more these improvements can be combined into various mobility devices as will be described in more detail hereinafter.

As described herein, when one or more components are described or shown as being connected, joined, affixed, coupled, attached, or otherwise interconnected, such interconnection may be direct as between the components or may be indirect such as through the use of one or more intermediary components. Also, as described herein, reference to a member, component, or portion shall not be limited to a single structural member, component, element, or portion but can include an assembly of components, members, elements, or portions.

While many of the innovations herein are described in the general context of a mobility device such as, for example, a gait trainer, their use is not limited gait trainers. These innovations are applicable to other mobility systems including industrial, commercial, and medical mobility systems. Industrial mobility systems include, for example, material/product handling and movement vehicles and similar devices used in industrial and manufacturing environments. Commercial mobility systems include, for example, passenger and package/cargo/supply vehicles and similar devices used in warehouses, stores and transportation environments. Medical mobility systems include gait trainers, standers, exercisers and other devices used to provide physical therapy or assist mobility impaired individuals. Hence, the innovations described herein widely applicable and beneficial to many types of mobility systems.

Referring to <FIG>, one embodiment of a mobility vehicle <NUM> is illustrated in the form of a novel gait trainer. The mobility vehicle <NUM> includes various assemblies for user positioning, support and freedom of movement. These include, for example, adjustable lateral support <NUM>, multi axial support <NUM>, foldaway footplate <NUM>, vertical suspension <NUM>, control input <NUM> and center of gravity adjustment <NUM>. Mobility vehicle <NUM> also includes various assemblies for ease of accessory connect and disconnect including detachable mast coupling <NUM> and detachable support accessory coupling <NUM>. Mobility vehicle <NUM> further includes various assemblies for portability and movement including frame folding mechanism <NUM>, wheel hub system <NUM>, caster wheel system <NUM>, and caster swivel lock <NUM>.

Referring now to <FIG> and <FIG>, the adjustable lateral support <NUM> will be described in more detail. As shown in <FIG>, adjustable lateral support <NUM> forms a space in which the gait user's sides are supported (if necessary). Lateral support <NUM> is adjustable to properly accommodate the particular size of the gait user. As shown in <FIG>, one embodiment of the adjustable lateral support <NUM> includes a housing <NUM>, which may be formed of housing portions 202A,B. Housing <NUM> includes apertures for mounting the lateral support to the body of the gait trainer.

Lateral support <NUM> also includes slide buttons 204A,B, brackets 206A,B and 208A,B, and support pads 210A,B. Slide buttons 204A,B are used to unlock the adjustable lateral support <NUM> so the distance between support pads 210A,B can be adjusted based on the size of the gait trainer user. Unlocking lateral support <NUM> allows brackets 206A,B and 208A,B to move closer or further way from each other as indicated by arrows <NUM>. Slide buttons 204A,B can be spring-biased to automatically lock the lateral support from adjustment when slide buttons 204A,B are released.

Slide buttons 204A,B are mounted to releasable lock bodies 216A,B via apertures 214A,B in housing portion 202A. Apertures 214A,B are sized or dimensioned to allow slide buttons 204A,B (or portions thereof) to move or slide within the apertures. Bodies 216A,B have a first end portion with slide button mounting projections <NUM> for connection to slide buttons 204A,B. Bodies 216A,B also have a second end portion with linkage pivot joints <NUM>. An opening <NUM> resides between the button mounting projection <NUM> and pivot joint <NUM>. A toothed or geared portion <NUM> is also provided on bodies 216A,B. Toothed portion <NUM> is shown slighted curved or arched to match or intermesh with the toothed portion of gear <NUM>. When the toothed portion <NUM> of bodies 216A,B intermeshes with gear <NUM>, the lateral support is locked and cannot be adjusted. When toothed portion <NUM> of bodies 216A,B is released from gear <NUM> via slide buttons 204A,B, the lateral support is unlocked and may be adjusted as shown by arrows <NUM>.

Linear gears 224A,B having toothed portions <NUM> that intermesh with gear <NUM>. Toothed portions <NUM> may extend partially or fully on linear gears 224A,B. Linear gears 224A,B are further connected to brackets 206A,B via extensions 240A,B. Brackets 206A,B are identically constructed. Thus, movement or rotation of gear <NUM> correspondingly moves linear gears 224A,B and brackets 206A,B in the direction of arrows <NUM>.

A guide body <NUM> is provided for releasable lock bodies 216A,B. Guide body <NUM> includes recesses <NUM> that receive lock bodies 216A,B and guide their movement. Guide body <NUM> also includes projections <NUM> in recesses <NUM>. Projections <NUM> are received in openings <NUM> of lock bodies 216A,B. Projections <NUM> serve to limit the range motion (or act as stops) for lock bodies 216A,B by bearing against the outer wall of openings <NUM>. The range of motion of lock bodies 216A,B is also limited by the outer wall of recesses <NUM>, which may be formed of complementary shape. For example, the end portion of each lock body 216A,B is rounded and each recess <NUM> can include a similarly rounded portion to receive the lock body act as a physical top on the range of motion. Configured as such, guide body <NUM> guides the range of motion of releasable lock bodies 216A,B so they can linearly engage and disengage from central gear <NUM>.

Housing portion 202B includes a recess <NUM> for receiving guide body <NUM> and brackets 206A,B. The recess's outer wall includes wall portions 246A-D which act as physical stops to limit the range of motion of brackets 206A,B via their extensions 240A,B. The stop or limit is accomplished when extensions 240A,B bear against or contact wall portions 246A-D. For example, the linear range of motion of extension 240A (and therefore bracket 206A) is limited by wall portions 246C,D. Similarly, the linear range of motion of extension 240B (and therefore bracket 206B) is limited by wall portions 246A,B.

Adjustable lateral support <NUM> further includes a linkage assembly allowing user actuation of one slide button 204A,B to also act as actuation of the other slide button. This allows for one handed operation to unlock the adjustable lateral support for adjustment. For example, sliding movement of button 204A also causes sliding movement of button 204B via the linkage assembly. In this manner, the other hand of a user or therapist is free to grab one of the support brackets 206A,B and/or 208A,B (and/or support pad 210A,B) make adjustments as shown by arrows <NUM>.

The linkage assembly includes linkages <NUM> and 232A,B. Linkage <NUM> forms a hub linkage having a body with a central mounting aperture and extensions having pivot joints 248B,D or apertures for forming such joints. Hub linkage is rotatably mounted through its central aperture to guide body <NUM>. Linkages 232A,B have bodies with pivot joints 248A,C or apertures for forming such joints. Linkages 232A,B are pivotably joined to hub linkage <NUM> at pivot joints 248B,D and to lock bodies 216A,B at pivot joints 248A,C. In operation, movement of either slide button 204A,B causes movement of its corresponding lock body 216A,B, which causes movement of its corresponding linkage 232A,B. Movement of linkage 232A (for example) causes hub linkage <NUM> to rotate, which correspondingly causes movement of linkage 232B. Thus, linkages <NUM> and 232A,B move in unison thereby causing lock bodies 216A,B to move in unison. This unified action allows movement of one slide button 204A,B to effectively move both lock bodies 216A,B freeing up central gear <NUM> to rotate so support brackets 206A,B can be adjusted in or out. By only having to move one slide button 204A,B (instead of both), only one hand is necessary for unlocking the adjustable lateral support structure leaving the other hand free to extend or retract the lateral support brackets and pads.

Referring now to <FIG> and <FIG>, the multi-axial support <NUM> will be described in more detail. As shown in <FIG>, multi-axial support <NUM> provides a structural connection between the primary framework or structure of the gait trainer (like mast and vertical suspension system <NUM>) and supportive accessories for the gait trainer user's hip, back, and/or seat pad). Multi-axial support <NUM> allows natural oblique and axial movement of the pelvis while walking that would otherwise be encumbered or restricted by the supportive accessories being mounted rigidly to the structure of the gait trainer. The two-axis radial motion provided by multi-axial support <NUM> more accurately follows the natural motion of the human body in gait.

As shown in <FIG>, one embodiment of multi-axial support <NUM> includes bodies <NUM>, <NUM> and <NUM>. Mounting body <NUM> receives rotating body <NUM> and rotating body <NUM> receives pivoting body <NUM>. Pivoting body <NUM> includes mounting bores or apertures 310A,B for mounting supportive accessories for the gait trainer user's body. So arranged, rotating body <NUM> rotates as shown by arrows <NUM> providing a first degree of axial movement/rotation and pivoting body <NUM> rotates or pivots as shown by arrows <NUM> providing a second degree of axial movement/rotation. In this manner, two axis radial motion is provided to any mounted supportive accessories. A spring-loaded locking plunger <NUM> is also provided to lock multi-axial support <NUM> from any radial motion.

Mounting body <NUM> is generally cylindrical and has an inner recessed space <NUM> also generally cylindrical and receiving body <NUM>. Body <NUM> also includes a pair of mounting bores or holes 312A,B for mounting accessories such as trays, backrests, headrests, armrests, etc. that generally do not need to follow the motion of the human body in gait. Mounting body <NUM> further includes an attachment/mounting portion <NUM> for attaching body <NUM> to the supportive structure of the gait trainer.

Recessed space <NUM> of mounting body <NUM> receives bearing assembly <NUM> that is seated in a recessed back wall <NUM>. Bearing assembly <NUM> can be in the form of a thrust bearing or other suitable bearing for allowing bodies <NUM> and <NUM> to rotate relative each other. Mounting body <NUM> also includes channels 318A,B, which may be V-shaped or other similar shape. Channels 318A,B operate with spring-loaded (<NUM>) ball bearings 316A,B to provide a spring defaulted for return-to-center and/or resistance for rotating body <NUM>. Balls 316A,B and associated springs <NUM> reside in cylindrical chambers <NUM> and <NUM> in the recessed space <NUM> of rotating body <NUM>. Cylindrical chambers <NUM> and <NUM> radially extend from a central portion of recessed inner space <NUM> to the outer cylindrical wall rotating body <NUM>.

Rotating body <NUM> also includes apertures <NUM> exposing balls 316A,B residing in chambers <NUM> and <NUM>. Apertures <NUM> (and hence balls 316A,B and associated springs <NUM>) are located proximate the rear closed portion of rotating body <NUM> with acutely within recessed space <NUM>. Apertures <NUM> (and hence balls 316A,B and associated springs <NUM>) also arranged approximately <NUM>° apart relative to the cylindrical shape of rotating body <NUM>. Other arrangements are also possible including different angular displacements.

In operation, balls 316A,B are normally seated against the vertex/apex of the V-shaped channel (i.e., return-to-center position). As body <NUM> rotates, balls 316A,B bear against one of the legs of the V-shaped channels. This causes balls 316A,B to recess inward into body <NUM> from ball apertures <NUM> and against the pressure of springs <NUM>, which begins to add a degree of resistance to the rotational movement. Also, when balls 316A,B first encounter the outer portion of channels 318A,B, they will tend to urge or guide rotating body to its return-to-center position by allowing the balls to move down the legs of the channel toward the vertex/apex of the channel.

Channels 318A,B may be larger or smaller than shown depending on when a return-to-center effect is desired to start. Channels 318A,B may also be tapered to allow for easier assembly of rotating body <NUM> into mounting body <NUM>. For example, as shown, channels 318A,B may be wider near the open end of mounting body <NUM> and narrower near the closed end of body <NUM>. Such an arrangement makes it easier for balls 316A,B to locate the channels 318A,B upon initial insertion of rotating body <NUM> into mounting body <NUM>.

Mounting body <NUM> further includes a projection <NUM> that is received within aperture or opening <NUM> and rotating body <NUM>. Projection <NUM> may be a pin, cylinder, or any other suitable projecting member or shape. Projection <NUM> extends from wall portion <NUM>, which can be raised or extending from back wall portion <NUM>. Projection <NUM> is located a radial distance away from axial mounting aperture <NUM>, which receiving mounting fastener <NUM>. In other embodiments, projection <NUM> can be located at other radial distances closer or further away from that shown.

Opening <NUM> in rotating body <NUM> is curved or arcuate in one embodiment and arranged to receive projection <NUM>. Opening <NUM> is curved or arcuate in order to allow rotating body <NUM> to rotate through the curved or arc of opening <NUM>. During rotation of body <NUM>, projection <NUM> limits the rotational body <NUM> by making contact with the end portions of curved opening <NUM>. When rotating body <NUM> is in the center (or return-to-center) position, projection <NUM> is located in the proximate center of curved opening <NUM>.

As body <NUM> rotates, curved opening <NUM> axially rotates causing projection <NUM> to move from its center position towards one side or the other of curved opening <NUM>. The rotation of body <NUM> is limited to when projection <NUM> makes contact with the end walls at one end or the other of curved opening <NUM>. Opening <NUM> can be sized (e.g., in arcuate length) to match the size of channels 318A,B (e.g., also in arcuate length across the opening of the legs of the V-shaped channel). In other embodiments, curved opening <NUM> can be sized larger or smaller than the size of channels 318A,B. In other embodiments, projection <NUM> can be located on rotating body <NUM> and curved opening <NUM> can be located on mounting body <NUM>. In yet other embodiments, either of mounting apertures <NUM> or <NUM> can include an arcuate slot cutout for receiving a projection or extension to reside within to accomplish the same result (e.g., rotational motion limits) as projection <NUM> and curved opening <NUM>. Mounting body <NUM> further includes an aperture projection <NUM> for mounting lock plunger <NUM>, which selectively locks the body <NUM> from rotating via an aperture or opening in rotating body <NUM> that receives the locking pin from lock plunger <NUM>.

Inner recessed space <NUM> of body <NUM> receives and moveably mounts pivot body <NUM>. Pivoting body <NUM> includes an axial mounting cylinder <NUM> having a bore or hole for receiving pin or shaft <NUM>. Shaft <NUM> forms the axis about which body <NUM> pivots. Shaft <NUM> is secured in shaft apertures <NUM> and <NUM> and rotating body <NUM>. The inner recessed space <NUM> of rotating body <NUM> includes flattened and raised wall sections <NUM> and <NUM> having the shaft apertures <NUM> and <NUM>. Wall sections <NUM> and <NUM> provide structural support to rotating body <NUM> where pivoting body <NUM> is connected thereto.

Extending from mounting cylinder <NUM> is a first portion having mounting holes 310A,B. This first portion includes top and bottom lateral supports <NUM> and <NUM> and intermediate lateral support <NUM>. Between these lateral supports are vertical supports <NUM>, <NUM>, and <NUM>. Vertical support <NUM> extends between mounting holes 310A,B and is joined, connected, extending from or formed with lateral support <NUM> and vertical supports <NUM> and <NUM>. So arranged, each of these supports (except <NUM>) extend from central mounting cylinder <NUM> to provide structural support for accessories attached to mounting holes 310A,B.

Pivoting body <NUM> also includes a second portion that includes cylindrical mounting chamber <NUM>. Ball bearing 316C and associated spring <NUM> are seated and contained within cylindrical mounting chamber <NUM>. Cylindrical mounting chamber <NUM> extends from mounting cylinder <NUM> proximate one end thereof (e.g., upper end). Ball 316C and associated spring <NUM> arranged to work with channel <NUM> (which can be V-shaped) in rotating body <NUM> (see <FIG>) in the same way balls <NUM> A,B are configured to work with channels <NUM> A,B to provide a return-to-center arrangement and function between mounting body <NUM> and rotating body <NUM>. In this case, the return-to-center arrangement and function is between pivoting body <NUM> and rotating body <NUM> whereby pivoting body <NUM> is returned to its center position. For example, in the default center position, ball 316C is located at the vertex/apex of the V-shaped channel <NUM>. When pivot body <NUM> moves, ball 316C will leave the vertex/apex of the channel <NUM> and begin to ride against one of the legs of the V-shape, as described previously in the context of balls 316A,B and channels 318A,B and which is hereby incorporated by reference.

The movement of pivoting body <NUM> is limited by walls 380A,B, which are proximate the ends of channel <NUM>. The end of movement occurs when ball bearing 316C (or cylindrical chamber <NUM>) encounters walls 380A or B or proximity thereto such as by the vertex/apex form by walls 380A,B and the ends of channel <NUM>. In other embodiments, the end of movement can be accomplished similar to the pin <NUM> and arcuate opening <NUM> arrangement described earlier whereby a pin may be located on either pivoting body <NUM> or rotating body <NUM> and a curved aperture located on the other (or vice versa).

Pivoting body <NUM> includes a further extension <NUM> having an aperture therein. Extension <NUM> is arranged so that it's aperture selectively receives the pin of lock plunger <NUM> to lock pivoting body <NUM> from motion. So arranged, pin of lock plunger <NUM> extends through apertures in mounting body <NUM>, rotating body <NUM>, and pivoting body <NUM> thereby locking each of these bodies for movement relative to each other.

So configured, rotating body <NUM> rotates as shown by arrows <NUM> providing a first degree of axial movement/rotation and pivoting body <NUM> rotates or pivots as shown by arrows <NUM> providing a second degree of axial movement/rotation. In this manner, two axis radial motion is provided to any mounted supportive accessories to better mimic the human body's motion in gait.

Referring now to <FIG> and <FIG>, the frame folding assembly <NUM> will be described in more detail. As shown in <FIG> and <FIG>, frame folding assembly <NUM> provides a framework of primary and bracing elements that can be folded for the purpose of storage, shipping, or local transport. Assembly <NUM> also provides the ability to lock the framework in either folded or unfolded state. In frame folding assembly <NUM> includes a first frame portion having side frame members <NUM> and <NUM> and a cross frame member <NUM>. A second frame portion has supports <NUM> and <NUM> that are connected to the first portion via pivot joints <NUM> and <NUM>. If third frame portion is provided and includes a mast member <NUM> that is connected to cross frame member <NUM> at pivot joint <NUM>. A clamping mechanism <NUM> is also provided connecting mast member <NUM> to support members <NUM> and <NUM>.

Mast member <NUM> includes a track <NUM> extending at least partially along its length and optionally during its entire length. Track <NUM> can take the shape of a recessed channel or groove or other shape permitting sliding or similar movement of clamping mechanism <NUM>. In one embodiment, track <NUM> includes lock apertures <NUM> and <NUM>. Lock apertures <NUM> and <NUM> are located within groove <NUM> to provide locations where clamping mechanism <NUM> can be mechanically locked in position. These positions include, for example, a folded frame position (e.g., as represented by lock aperture <NUM>) and an unfolded position (e.g., as represented by lock aperture <NUM>). Additional apertures may be provided within track <NUM> to mechanically lock the frame in intermediate positions.

Clamping mechanism <NUM> rides within groove <NUM> and includes, in one embodiment, a body <NUM> having a clamping handle mounting portion <NUM>, support member mounting space <NUM>, lock mounting portion <NUM>, and clamping member <NUM>. Clamping handle mounting portion <NUM> includes a cylindrical bore or hole through which shaft <NUM> extends. Shaft <NUM> is connected to clamping handle <NUM> at one end of its shaft body and to clamping member <NUM> at the other end of its shaft body. Shaft <NUM> can be moved within mounting portion <NUM> via movement of handle <NUM>. Handle <NUM> has a rounded and cammed end <NUM> in contact with mounting portion <NUM>. As handle <NUM> rotates from the position shown, the rounded and cammed end <NUM> in contact with mounting portion <NUM> causes shaft <NUM> to move further into mounting portion <NUM>. This causes clamping member <NUM> to move away from clamping body <NUM> and, to in effect, loosen or unclamp the clamping mechanism. Handle movement in the opposite direction draws shaft <NUM> partly from mounting portion <NUM> and causes clamping member <NUM> to move closer to clamping body <NUM> and to, in effect, tighten or clamp the mechanism against mast member <NUM>.

Clamping member <NUM> includes an elongate body having end portions <NUM> and <NUM>. In one embodiment, end portions <NUM> and <NUM> are tapered (as shown) to allow ease of assembly and disassembly, as well as sliding motion of the clamping member <NUM> in track/groove <NUM>. Any form of tapering can be provided including, for example, rounded, triangular, polygonal, etc. Elongate body of clamping member <NUM> also includes base portion <NUM> and extension portion <NUM>. Extension portion <NUM> is elongate and narrower than base portion <NUM>. This allows the wider areas of base portion <NUM> alongside extension portion <NUM> to press up against the inner surfaces of track/groove <NUM> during clamping to immobilize clamping member <NUM> in its location in track/groove <NUM>. Elongate body of clamping member <NUM> also includes at least first and second apertures <NUM> and <NUM> for receiving and affixing to clamping shaft <NUM> and a mounting shaft <NUM>. Apertures <NUM> and <NUM> are located proximate the end portions <NUM> and <NUM>, but may also be located at other positions on clamping member <NUM>.

Locking plunger <NUM> includes a knob <NUM> and spring-biased locking pin <NUM>. In one embodiment, locking pin <NUM> is spring-biased to extend out of clamping mechanism <NUM> so as to automatically engage into locking apertures <NUM> and <NUM> in track/groove <NUM> when these apertures are encountered. Locking pin <NUM> is withdrawn from locking apertures <NUM> and <NUM> by pulling on knob <NUM>. In this manner, these mechanically locked locations at apertures <NUM> and <NUM> are provided at either end of clamping mechanism <NUM>'s range of traverse to provide greater ease of handling and transport, and to further provide a secure and rigid clamping at either end of the range of traverse, where sliding movement would be undesirable.

<FIG> are partial side elevational views showing a gait trainer's mast member <NUM> and frame members in folded (<FIG>) and unfolded positions (<FIG> can be an example of when the frame is unfolded and clamping mechanism <NUM> is engaged into mechanical locking aperture <NUM>. <FIG> can be an example of when the frame is folded and clamping mechanism <NUM> is engaged into mechanical locking aperture <NUM>. During folding, mast member <NUM> pivots about pivot connection <NUM> and supports <NUM> and <NUM> pivot about pivot connections <NUM> and <NUM>. These pivot connections may be formed by, for example, a clevis fastener or similar type of arrangement. As shown in <FIG>, the length of mast member <NUM> (and corresponding location of locking aperture <NUM>) can be chosen to allow for pivoting or folding to varying degrees including flat (e.g., <NUM> degrees (more or less) as illustrated by the position of mast member <NUM>') or even further to facilitate folding, storage and/or transport.

Referring now to <FIG> and <FIG>, the detachable post coupling assembly <NUM> will be described in more detail. As shown in <FIG>, coupling assembly <NUM> provides for the easy and secure attachment of equipment to the post or mast framework. In one embodiment, the coupling is composed of mating haves in a dovetailed lug (e.g., <NUM>/<NUM>) and receiver (e.g., <NUM>/<NUM>/<NUM>) configuration. The dovetail is provided by tapering the lug and receiver so that a funnel-like effect occurs requiring little alignment and coordination to begin the coupling operation. Once begun, the mating halves are effortlessly brought into full alignment and seated completely. Additionally, a stop feature (e.g., <NUM>) is incorporated to prevent undesirable wedging or inadvertent binding of the joint or coupling. A spring plunger (e.g., <NUM>/<NUM>/<NUM>) or other keyed or dowel-like feature may then lock the halves together in the sliding axis. Further, a draw-type of clamp (e.g., <NUM>) secures a locking wedge or clamping member (e.g., <NUM>) against the side of the dovetail element (e.g., <NUM>) to secure the <NUM> halves without looseness.

<FIG> illustrate one particular embodiment of a coupling assembly <NUM>. Assembly <NUM> includes a body <NUM> having a receiver portion <NUM>, lock pin assembly <NUM>, and lock clamp assembly <NUM>. Body <NUM> includes a first recess <NUM> and second recess <NUM>. First recess <NUM> is formed by side projections 512A,B and side recesses 514A,B. In one embodiment, first recess <NUM> is tapered having a wider upper portion <NUM> and a narrower lower portion <NUM> (see <FIG>). Thus, side projections 512A,B include end surfaces tapering recess <NUM> from wide to narrow. Similarly, side recesses 514A,B taper from wide to narrow by virtue of these and surfaces. In other embodiments, recess <NUM> does not have to be tapered or can include tapering greater or less than that shown and described herein. As described earlier, recess <NUM> provides a tapered receiver space facilitating easier alignment, end of travel and assembly of the mating halves of the coupling.

Second recess <NUM> is a further cavitation/recess in recess <NUM> and facilitates a stop feature in the coupling <NUM>. The stop feature (e.g., <NUM>/<NUM>) further facilitates end of travel and locking of the mating halves of the coupling <NUM>. To facilitate end of travel, recess <NUM> is in the form of a second receiver space having a rounded end wall located a distance within recess <NUM> to stop any further insertion of the stop projection <NUM> and tapered mounting projection/lug <NUM>. While a rounded surface is shown, any shape may be used so long as it stops further insertion.

Recess <NUM> further includes an aperture for lock pin <NUM>. Lock pin <NUM> is part of lock pin assembly <NUM>, and can be spring-biased <NUM> to allow lock pin <NUM> to retract from recess <NUM> (and stop projection <NUM>) under spring pressure and then to extend into recess <NUM> (and stop projection <NUM>) to achieve a lock. Body <NUM> includes a lock pin assembly mounting portion <NUM> to retain lock pin <NUM> and spring <NUM>.

A lock clamp assembly <NUM> is also provided. In one embodiment, clamp assembly <NUM> includes a clamping member/wedge <NUM>, shaft <NUM>, and handle <NUM>. Body <NUM> has a bore or chamber <NUM> in which clamping member/wedge <NUM> and shaft <NUM> extend into and through as shown. Clamping member/wedge <NUM> as a notch or cut <NUM> approximating the geometry of lug/mounting projection <NUM> for exerting a clamping pressure to lock the lug/mounting projection <NUM> in position. Clamping member/wedge <NUM> further includes a channel through which shaft <NUM> extends and connects to handle <NUM>. Clamping member/wedge <NUM> may move along shaft <NUM> to an inward position (into body <NUM>) to cause clamping and to a relatively outward position to release clamping. Movement of clamping member/wedge <NUM> on shaft <NUM> is caused by rotation of handle <NUM>. Handle <NUM> is a clamping handle having a cammed surface proximate its connection to shaft <NUM>. The cammed surface is in contact with clamping member/wedge <NUM> and as the cammed surface is rotated in one direction by handle <NUM>, it exerts an increasing clamping pressure by pushing on clamping member/wedge <NUM>. As the cammed surface is rotated in the other direction by handle <NUM>, it exerts a decreasing clamping pressure on clamping member <NUM>/wedge thereby releasing any clamping effect.

Mounting projection <NUM> acts as a lug to be received by recess <NUM>. In one embodiment, mounting projection <NUM> includes projecting side portions 522A,B and stop projection <NUM>. Projecting side portions 522A,B taper to provide mounting projection <NUM> a tapered profile having a wider upper portion <NUM> and a narrower lower portion <NUM> (<FIG>). Stop projection <NUM> includes an aperture <NUM> for receiving lock pin <NUM>. Stop projection <NUM> works in conjunction with recess <NUM> to create a stop or an end of travel for the mounting projection <NUM> when it is inserted into recess <NUM> and lock pin <NUM> is inserted into aperture <NUM> to lock the halves of the coupling. The tapering of mounting projection <NUM> corresponds to the tapering of recess <NUM> in order to accomplish the dovetail providing the funnel-like effect for alignment and seating of the mating halves of the coupling. While dovetailing and tapering are described, any suitable guided alignment arrangement can be employed.

When the mating halves of the coupling <NUM> are aligned and seated, they can be locked in position by locking pin <NUM> and secured against looseness by lock clamp assembly <NUM>. As previously described, locking is achieved by extending locking pin <NUM> through recess <NUM> and into aperture <NUM> of stop projection <NUM>. Securing the mating halves against looseness is accomplished by draw-type lock clamp assembly <NUM>. Through handle <NUM>, clamping member/wedge <NUM> is moved into contact with projecting side portion 522A of mounting projection <NUM>. In particular, notch <NUM> in clamping member/wedge <NUM> captures and presses against projecting side portion 522A. This causes opposite side projecting portion 522B to forcefully press against the walls of side recess 514B thereby eliminating any looseness between the mating halves of the coupling.

Referring now to <FIG> and <FIG> the leg/footrest assembly <NUM> will be described in more detail. As shown in <FIG>, leg/footrest assembly <NUM> can be part of a gait trainer device. One problem during gait training is that as fatigue and tiredness set in, relief in the form of a chair, bed, wheelchair, etc. may not be close by. It is not desirable for an attendant to leave the user standing unattended while a chair or cart is retrieved. Leg/footrest assembly <NUM> provides a foot platform or a pair of footrests incorporated into or attached to the gait trainer that can be deployed to offer a temporary platform on which to stand while the attendant rolls the gait trainer to a place suitable for the patient to sit or rest. In one embodiment, a hinged footrest is attached to the frame at either or both sides of the patient and can be folded out of the way during normal walking activity.

Referring now to <FIG>, one embodiment of leg/footrest assembly <NUM> is shown. Assembly <NUM> includes frame attachment members 602A,B, clamping members 606A,B, mounting apertures 604A,B, and footplate <NUM>. Attachment members 602A,B have a body that includes an upper portion forming part of apertures 604A,B and a lower portion for pivotally attaching to footplate <NUM> via projecting pins 610A,B that form a pivot joint. Each attachment member 602A,B attaches to the upper portion of further includes proximate the lower portion thereof a stop pin <NUM>. Clamping members 606A,B have a body that is attached to the upper portion of attachment members 602A,B. The body includes the remaining portion of apertures 604A,B. Apertures 604A,B are used to attached or clamp assembly <NUM> to the frame of, for example, a gait trainer device. Clamping members 606A,B includes fastener holes for attaching clamping members 606A,B to attachment members 602A,B thereby forming apertures 604A,B. Apertures 604A,B have non-circular shapes to secure assembly <NUM> from rotational movement. In the embodiment shown, apertures 604A,B have a curved elliptical shape with a linear or straight side portion. This geometry is arranged to capture correspondingly arranged frame member (e.g., elliptical with a straight portion). Nevertheless, other non-rotating geometries or shapes can be employed include polygonal (e.g., triangles, squares, rectangles, etc.).

Footplate <NUM> includes the substantially planar surface and side brackets 612A,B. In one embodiment, side brackets 612A,B are L-shaped and include an angled extension <NUM>. Apertures 622A,B are also provided for pivotally connecting footplate <NUM> to attachment members 602A,B. Openings or notches <NUM> and <NUM> are provided radially offset from apertures 622A,B. Openings <NUM> and <NUM> allow footrest <NUM> a range of pivot and end of travel limits. Opening <NUM> and <NUM> or formed along an arc <NUM> and have associated curved shapes to accommodate the arc. Opening <NUM> serves to allow footplate <NUM> to be deployed (e.g., pivoted or rotated) in the open position allowing a user to stand on the footplate to rest. By pivoting or rotating footplate <NUM>, stop pin <NUM> enters opening <NUM> and reaches the end wall of opening <NUM> thereby deploying the foot rest for standing thereon. In the open position, footplate <NUM> is deployed in the space between the side frame members of the gait trainer where the user resides. To fold footplate <NUM> away, it is rotated until stop pin <NUM> enters opening <NUM> and reaches the end wall of opening <NUM>. In this closed position, footplate <NUM> is no longer deployed in the space between the side frame members of the gait trainer. Footplate <NUM> is now folded out of the way to allow normal walking/gating activity. So arranged, a hinged footrest <NUM> is provided.

It should be noted that other embodiments of mechanical hinging or folding away can be used instead of that shown as long as footplate <NUM> can be deployed to operate as a temporary platform which to stand. Furthermore, while the exemplary embodiment shows one footplate assembly <NUM> attached to one side of the gait trainer's frame, the second corresponding footplate assembly may also be attached to the other side of the gait trainers frame. Further yet, in the single footplate assembly <NUM> embodiment, footplate <NUM> may extend substantially across the entire space between the side frames of the gait trainer. Therefore, based on the description herein, other modifications and embodiments are encompassed.

Referring now to <FIG> and <FIG>, the user support coupling <NUM> will be described in more detail. As shown, user support coupling <NUM> provides for the easy and secure attachment of user support equipment such as, for example, harnesses, seatbelts, support straps, and related devices. Support coupling <NUM> includes mating halves (e.g. receiver body <NUM> and coupler body <NUM>) and a latching member (e.g., <NUM>) to lock and unlock the meeting components. So arranged, user support equipment (e.g., <NUM>) can be fitted to the user while they are seated or in bed and then coupled to the medical device (e.g., gait trainer or the like). This arrangement is easier compared to if the user needs to stand supported while being strapped and buckled into the gait trainer, for example.

The meeting halves <NUM> of the support coupling <NUM> includes receiver body <NUM> and coupler body <NUM>. Receiver body <NUM> is connected to bracket <NUM> with fasteners thereby attaching to the central mast system of the frame. Receiver body <NUM> has a recessed space <NUM> and extending flanges/projections 716A,B. Recessed space <NUM> further includes an end of travel or stop wall <NUM>. Extending flanges 716A,B progressively narrow recessed space <NUM> as it approaches the outer surface of receiver body <NUM> thus providing a dovetail like arrangement for receiving coupler body <NUM>, which is similarly arranged.

Receiver body <NUM> further includes a channel or chamber <NUM> for receiving latching member <NUM>. A notch or opening <NUM> is also associated with chamber <NUM> for accommodating a button end portion <NUM> of latching member <NUM>. Chamber <NUM> extends substantially through receiver body <NUM> but not completely through. A hole <NUM> is provided in a wall of receiver body <NUM> and that wall also terminates channel <NUM>. As will be described in more detail, hole <NUM> is used to provide a spring-loaded fastener for attaching to latch member <NUM> and biasing it in the latching position.

Coupler body <NUM> includes projecting side portions 724A,B and support mounting projections <NUM>. Projecting side portions 724A,B are arranged to substantially match the geometry of recessed space <NUM> and receiver body <NUM>. Accordingly, projecting side portion 724A,B widen or extend receiver body <NUM>. At least one of the projecting side portions 724A,B include a notch/opening <NUM> that acts as a first latching portion that works in conjunction with latching member <NUM>. In this manner, coupler body <NUM> can be easily inserted into the recessed space <NUM> of receiver body <NUM>. Coupler body <NUM> is inserted until it makes contact with stop wall <NUM>. Due to the dovetail arrangement between receiving body <NUM> and coupler body <NUM>, coupler body <NUM> cannot be pulled away from receiver body <NUM>.

Latch member <NUM> is provided so coupler body <NUM> cannot be inadvertently lifted out of recess <NUM> and receiver body <NUM>. Latch member <NUM> includes a body having a first end portion with the button <NUM> and a second end portion <NUM> with the latching portion <NUM>. In one embodiment, latching portion <NUM> includes a slanted latching surface <NUM> for being received in notch/opening <NUM> of coupler body <NUM>. In other embodiments, surface <NUM> can be any shape including rounded, slanted, rectangular, square, polygonal, boss-like, etc..

Latch member <NUM> further includes a recess portion <NUM> between its first and second ends <NUM> and <NUM>. Recess portion <NUM> is arranged to create a space for coupler body <NUM> when it is inserted into receiver body <NUM>. A spacer projection <NUM> is also provided to bear against an inside wall of channel <NUM> in order to prevent looseness between latch member <NUM> and that portion of channel <NUM>. A threaded hole <NUM> is further provided for connecting to a spring-loaded fastener associated with hole <NUM> in receiver body <NUM>.

In operation, latch member <NUM> is seated in channel <NUM> with its latching portion <NUM> extending into recess <NUM>. As coupler body <NUM> is inserted into recess <NUM>, projecting side portion 724A encounters the slanted latching surface <NUM>. The slanted latching surface <NUM> begins to retract from recess <NUM> against its spring bias and the insertion forces of coupler body <NUM>. This retraction allows coupler body <NUM> to continue its insertion into recess <NUM> until slanted latching surface <NUM> encounters notch/opening <NUM>. Since notch/opening <NUM> as a similar/complementary shape to latching surface <NUM>, latching surface <NUM> will be forced by its spring to enter into notch/opening <NUM> thereby latching or locking coupler body <NUM> into receiver body <NUM>. In this state, coupler body <NUM> cannot be lifted out of receiver body <NUM>. In order to release coupler body <NUM> so it can be lifted out of receiver body <NUM>, button end portion <NUM> is pushed in the direction of receiver body <NUM> and causes latching surface <NUM> to be withdrawn from notch/opening <NUM>. Coupler body <NUM> can now be lifted out of receiver body <NUM>.

Referring now to <FIG> and <FIG>, the wheel hub brake system <NUM> will be described in more detail. As shown in <FIG>, the wheel hub brake system <NUM> can be part of a medical device such as, for example, a gait trainer, wheelchair, walker, rollator, lift, cart, etc., or it can be part of a commercial, consumer, or industrial device (i.e., non-medical) such as, for example, a cart, chair, vehicle, etc. In one embodiment, system <NUM> includes a deeply recessed hub or drum having teeth that engage a pawl body to provide various braking effects. In one arrangement, the pawl body is moved into engagement with the drum teeth and remains (or is locked) there braking the drum from further rotation in either direction. In another arrangement, the pawl body selectively engages the drum teeth and prevents the drum for rotating in one direction but allows the drum to rotate in the other direction thereby providing a one-way clutch (e.g., anti-rollback). A wheel is connected to the drum and rotates therewith.

Referring to <FIG>, one embodiment of a wheel hub system <NUM> is illustrated having a hub/housing <NUM>, a first side having a drum portion <NUM>, and a second side having a pawl portion <NUM>. The drum portion <NUM> includes, for example, braking components having a drum <NUM> and brake shoe assembly <NUM>. The drum <NUM> includes an inner space <NUM> having the brake shoe assembly <NUM> received therein. The pawl portion includes, for example, slide button <NUM>, slide member/body <NUM>, and pawl body <NUM>. Other system components include, for example, covers <NUM> and <NUM>, brake cable actuator <NUM> and guide <NUM> for actuating brake shoe assembly <NUM> to brake the drum <NUM>, and an axle shaft with bearings for rotatably supporting system <NUM>.

Housing <NUM> and cover <NUM> cooperatively house slide member <NUM> and pawl <NUM>. Housing <NUM> includes a first recess <NUM> receiving drum portion <NUM> and a second recess <NUM> movably receiving pawl body <NUM>. First recess <NUM> includes an opening <NUM> for allowing pawl body <NUM> to selectively contact drum portion <NUM> to provide a braking effect. Cover <NUM> includes an opening <NUM> and a recess or channel <NUM> for moveably receiving slide button <NUM> and slide body <NUM>, which cause movement of pawl body <NUM>.

Drum <NUM> includes a generally cylindrical body <NUM> having a plurality of projections or ratchet teeth <NUM>. In one embodiment, teeth <NUM> are located near the outer edge portion of cylindrical body <NUM>. In other embodiments, teeth <NUM> may be located further away from the outer edge portion of cylindrical body <NUM> including, for example, anywhere along cylindrical body <NUM>. Still further, in other embodiments, teeth <NUM> can extend the entire length of cylindrical body <NUM> instead of only a portion of the length (as shown). As will be described, drum teeth <NUM> will selectively engage with pawl body <NUM> to provide a braking effect.

Pawl body <NUM> includes, for example, a plurality of projections or teeth <NUM> and a projecting member <NUM>. In one embodiment, teeth <NUM> are arcuately disposed near the end portion of pawl body <NUM>. The arcuate arrangement can be made to match the arcuate disposition of teeth <NUM> on drum <NUM>. In other embodiments, the arcuate disposition of teeth <NUM> can approximately match (as opposed to exactly match) the arcuate disposition of teeth <NUM> on drum <NUM>. As will be described, teeth <NUM> on pawl body <NUM> will selectively engage teeth <NUM> on drum <NUM> to provide a braking effect.

Projecting member <NUM> extends from pawl body <NUM> and connects pawl body <NUM> to slide body <NUM>. In one embodiment, slide body <NUM> includes a guide/channel <NUM> for movably receiving projecting member <NUM>. Channel <NUM> can include first, second and third portions <NUM>, <NUM>, and <NUM>. These channel portions govern the movement and position of pawl body <NUM> through its projecting member <NUM> and its resulting behavior with respect to drum <NUM> (e.g., see movement direction arrow <NUM>). Slide body <NUM> includes the projecting mounting member for connecting to slide button <NUM>. So arranged, movement of slide button <NUM> moves slide body <NUM> and selectively positions pawl body <NUM> (through its projecting member <NUM>) in various positions in channel <NUM> (including in first, second, and third channel portions <NUM>, <NUM>, and <NUM>).

In one embodiment, channel portion <NUM> moves the pawl body <NUM> out of engagement with drum <NUM> (e.g., pawl teeth <NUM> do not engage with drum teeth <NUM>) and no braking effect is provided. Channel portion <NUM> moves pawl body <NUM> into engagement with drum <NUM> (e.g., allowing pawl teeth <NUM> to engage with drum teeth <NUM>) to provide a braking effect on drum <NUM>.

If channel portion <NUM> is provided, pawl body <NUM> can selectively brake drum <NUM> to provide one-way rotation (or anti-rollback). More specifically, channel portion <NUM> allows pawl body <NUM> to move away from drum <NUM> thereby not providing a braking effect on drum <NUM>. This occurs when drum <NUM> rotates in the direction of arrow <NUM> (e.g., see <FIG>). Drum <NUM> rotation in the direction of arrow <NUM> causes drum teeth <NUM> to use the diagonal surfaces (or cam surfaces) of pawl teeth <NUM> to move pawl body <NUM> away from drum <NUM> in a ratchet-type arrangement. Channel portion <NUM> allows this away movement of pawl body <NUM> (e.g., see arrow <NUM>). Similarly, recess <NUM> in which pawl body <NUM> resides is elongate to allow pawl body <NUM> movement into and out of engagement with drum <NUM>. Drum <NUM> rotation in the direction of arrow <NUM> causes pawl body <NUM>, via its teeth <NUM>, to lock or brake drum <NUM>, via its teeth <NUM>, from rotation. Therefore, selective or ratchet-type braking (i.e., also anti-rollback) is achieved by allowing drum <NUM> to rotate in one direction, but not in another direction.

In the embodiment shown, channel <NUM> has a V-shaped or a checkmark shape with straight portions connecting portions <NUM>, <NUM> and <NUM>. In other embodiments, channel <NUM> can have other shapes including a slanted straight line only as shown between channel portions <NUM> and <NUM> (e.g., excluding channel portion <NUM>). Also, curved portions can be used where straight portions are shown.

Hence, wheel hub brake system <NUM> provides a braking arrangement that can be part of any wheeled device. System <NUM> includes a deeply recessed drum <NUM> having ratchet teeth <NUM> that engage a pawl body <NUM> to provide various braking effects. In one arrangement, the pawl body <NUM> is moved into engagement with the drum teeth <NUM> and remains (or is locked) there braking the drum <NUM> from further rotation in either direction. In another arrangement, the pawl body <NUM> engages the drum teeth and prevents the drum for rotating in one direction <NUM> but allows the drum to rotate in the other direction <NUM> thereby providing a ratchet or one-way clutch with a selective pawl device.

Referring now to <FIG> and <FIG>, another embodiment of a wheel hub system <NUM> is shown. In one embodiment, wheel hub system <NUM> can be applied to caster-type wheels. As shown in <FIG>, the system <NUM> can be part of a medical device such as, for example, a gait trainer, wheelchair, walker, rollator, lift, cart, etc., or it can be part of a commercial, consumer, or industrial device (i.e., non-medical) such as, for example, a cart, chair, vehicle, etc. In one embodiment, system <NUM> has a friction assembly for selectively applying a degree of resistance or friction drag to the hub and wheel. In another embodiment, system <NUM> has a brake assembly for providing brake and/or anti-rollback (e.g., selectively braking) effect. In yet another embodiment, system <NUM> can include both a friction and brake assembly. In this manner, a brake, friction drag, and anti-rollback are provided to a wheel.

Referring to <FIG>, one embodiment of a wheel hub system <NUM> is shown. System <NUM> can include a first portion <NUM> having a brake assembly, a second portion <NUM> having a friction drag assembly, and a hub <NUM>. Brake assembly <NUM> uses ratchet teeth within the wheel hub <NUM> along with a selective pawl <NUM> to provide total braking and/or selectively braking of the wheel/hub. In one embodiment, brake assembly <NUM> includes a rotatable slide member <NUM>, housing <NUM>, pawl body <NUM> and cover <NUM>.

Rotatable slide member <NUM> includes a projecting member or pin <NUM>. In one embodiment, projecting member <NUM> is located radially a distance from the center of slide member <NUM> and proximate to its outer edge. Projecting member <NUM> extends from the rear face of slide member <NUM> so that it may be received in pawl body <NUM>. Rotatable slide member <NUM> includes a central opening for receiving axle shaft <NUM> about which slide member <NUM> can rotate. Rotation of slide member <NUM> causes projecting member <NUM> movement through an arc defined by the amount of rotation. Rotation of slide member <NUM> is accomplished by gripping an outer handle portion having radially positioned detents or handle grips and then rotating slide member <NUM> about axle shaft <NUM>. As will be described, this rotation allows brake assembly <NUM> to brake, unbrake, or selectively brake the wheel/hub <NUM> via pawl body <NUM>.

Housing <NUM> includes a portion <NUM> for receiving and guiding movement of pawl body <NUM> and a channel or opening <NUM> through which projecting member <NUM> extends. Pawl body receiving portion <NUM> may be in the form of a channel or guide formed with walls to accommodate pawl body <NUM> and allow its movement (e.g., linear movement) to provide the aforementioned braking effects. Channel or opening <NUM> allows projecting member <NUM> to extend therethrough and into pawl body channel <NUM> to determine the various type of braking modes (brake, unbrake, or selective brake) desired. Housing <NUM> is further mounted via fastener <NUM> to the wheel fork structure to prevent housing <NUM> from rotation. Housing <NUM> further includes indicia for indicating the braking mode selected via rotatable slide member <NUM>. These indicia include braking indicia <NUM>, selective (or one-way ratchet type) braking indicia <NUM>, and unlocked or unbraking indicia <NUM>. Projecting member <NUM> can extend through the body of housing <NUM> as an indicator to be used with indicia <NUM>, <NUM>, and <NUM>. In other embodiments, projecting member <NUM> may not extend through the body of housing <NUM> and other means instead can be used including, for example, a separate projecting member or other painted, molded, or otherwise distinctive indicia suitable for this purpose.

Housing member <NUM> further includes a central projecting member <NUM> that is received by slide member <NUM> for mounting/mating with slide member <NUM> and allowing rotation of slide member <NUM>. Also, a spring-loaded ball <NUM> and detent <NUM> arrangement is provided to automatically guide and releasably position rotatable slide member <NUM> in the appropriate positions for braking, unbraking, or selectively braking the wheel/hub.

Pawl body <NUM> includes a central aperture <NUM>, channel <NUM>, and projections or teeth <NUM>. Central aperture <NUM> is oversized to permit linear movement of pawl body <NUM>. Channel <NUM> can include, in one embodiment, first portion <NUM>, second portion <NUM>, and third portion <NUM>. Projecting member <NUM> is received in channel <NUM> and can be moved within channel <NUM> to these respective portions.

When projecting member <NUM> is located in first portion <NUM>, pawl body <NUM> and its teeth <NUM> are in contact with hub <NUM> and its teeth <NUM>. Teeth <NUM> and <NUM> locked together and braking or preventing rotation of wheel hub <NUM>. When projecting member <NUM> is located in second portion <NUM>, pawl body <NUM> and its teeth <NUM> provide selective braking (or anti-rollback) of hub <NUM>. Channel portion <NUM> allows pawl body <NUM> to move into and out of contact with hub teeth <NUM> thereby an anti-rollback or selective braking effect on hub <NUM>.

This accomplished by channel portion <NUM> having an enlarged section, bump-out or extension that allows linear (or up and down) movement of pawl body <NUM>, as indicated by arrow <NUM>. When projecting member <NUM> is located in this enlarged section, pawl body <NUM> and its teeth <NUM> contact hub <NUM> and its teeth <NUM> to prevent rotation of the wheel/hub <NUM> in the direction of arrow <NUM> (e.g., see <FIG>). Hub <NUM> rotation in the direction of arrow <NUM> causes hub teeth <NUM> to use the diagonal surfaces (or cam surfaces) of pawl teeth <NUM> to move pawl body <NUM> away from hub teeth <NUM> in a ratchet-type arrangement. This movement causes projecting member <NUM> to be positioned out of the enlarged section of channel portion <NUM> indicating pawl body <NUM> movement away from hub <NUM>. This movement away from hub <NUM> allows hub <NUM> to rotate Similarly, pawl receiving portion or channel <NUM> (in housing <NUM>) in which pawl body <NUM> resides is elongate or oversized to allow pawl body <NUM> movement into and out of engagement with hub teeth <NUM>. Therefore, selective or ratchet-type braking (i.e., also anti-rollback) is achieved by allowing hub <NUM> to rotate in one direction, but not in another direction.

When projecting member <NUM> is located in portion <NUM>, pawl body <NUM> is moved out of contact with hub teeth <NUM> indicating an unlocked or unbraking mode. In this mode, wheel/hub <NUM> is free to rotate. In one embodiment, pawl body channel <NUM> is slightly arcuate and configured so that projecting member <NUM> guides pawl body <NUM> to braking, unbraking, and selective or ratchet-type braking (e.g., anti-rollback). In other embodiments, pawl body channel <NUM> can be curved more or less than that shown or can be linear or approximately straight so long as the aforementioned modalities are provided.

As previously described, wheel hub assembly <NUM> may include friction drag assembly <NUM>. Friction drag assembly <NUM> includes, for example, a knob or handle <NUM>, mounting post <NUM>, bearing <NUM>, friction disc <NUM>, and hub disc <NUM>. In one embodiment, knob or handle <NUM> includes a central projecting member <NUM> having a plurality of detents <NUM>. Knob or handle <NUM> is connected to mounting post <NUM> via a threaded connection that allows knob or handle <NUM> to be turned on mounting post <NUM> for movement along mounting post <NUM>. Knob or handle <NUM> further includes indicia <NUM> and <NUM> indicating the relevant amount of friction drag that is applied as knob or handle <NUM> is rotated on mounting post <NUM>.

In one embodiment, mounting post <NUM> includes a pin or projection <NUM> for affixing to the wheel support structure such as, for example, a support fork. This prevents rotation of mounting post <NUM>. A ball spring/detent assembly <NUM> and <NUM> is provided and works in conjunction with detents <NUM> to allow knob or handle <NUM> to rotate on mounting post <NUM> at fixed increments of rotation. This is accomplished by detents <NUM> being circumferentially disposed on central projecting member <NUM> for receiving ball <NUM> under spring pressure. Rotation of knob or handle <NUM> compresses the spring and allows ball <NUM> to move from one detent to another along central projecting member <NUM>. In this manner, knob or handle <NUM> maintains its rotational position until it is rotated again.

Mounting post <NUM> further includes extensions <NUM> at one end thereof. Extensions <NUM> are used to connect mounting post <NUM> to friction disc <NUM>, which includes corresponding slots or cutouts <NUM> for receiving the extensions. Extensions <NUM> further prevent rotation of friction disc <NUM> by this arrangement but allow friction disc <NUM> to move along the length of the extensions. Hub disc <NUM> is received within a recess of hub <NUM> and includes extensions <NUM> that are received in hub slots <NUM>. Through this arrangement, extensions <NUM> and slots <NUM> fix hub disc <NUM> to hub <NUM> so that hub disc <NUM> rotates with hub <NUM>. Bearings <NUM> and <NUM> further provided and operate with axle shaft <NUM> to rotatably mount hub <NUM> thereon. Fastener <NUM> maintains the respective assemblies in position relative to axle shaft <NUM>.

In operation, rotation of knob or handle <NUM> causes its movement on mounting post <NUM>. Rotation of knob or handle <NUM> in a manner that causes it to move inwards towards hub <NUM> causes central projecting member <NUM> to apply pressure to friction disc <NUM>. This pressure causes friction disc <NUM> to either correspondingly move along the length of extensions <NUM> of mounting post <NUM> (if there is room for movement) until movement is restricted by contact with hub disc <NUM>, or if movement is already restricted by hub disc <NUM>, to apply the corresponding pressure to hub disc <NUM>.

Through this arrangement, when friction disc <NUM> is contacting hub disc <NUM>, friction is applied to the rotation of hub <NUM> because friction disc is fixed against rotation and is pressing against hub disc <NUM>. Also, through this arrangement, the amount pressure applied by friction disc <NUM> in its contact with hub disc <NUM> correspondingly controls the amount of friction drag that is applied to the rotation of hub <NUM>. Thus, rotation of knob or handle <NUM> controls the amount of pressure and thus the amount of friction drag that is applied to hub <NUM>.

Hence, wheel hub system <NUM> can be in the form of various embodiment. One embodiment includes a friction drag assembly for selectively applying a degree of resistance or friction drag to the hub and wheel. In another embodiment, system <NUM> may include a brake assembly for providing brake and/or anti-rollback (e.g., selectively braking) effect. In yet another embodiment, system <NUM> can include both a friction-drag and brake assembly. In this manner, brake, friction drag, and anti-rollback are provided to a wheel.

Referring now to <FIG> and <FIG>, a caster wheel system <NUM> is shown having a swivel lock. In one embodiment, caster wheel system <NUM> can be applied to any type of caster wheel or swivel assembly. As shown in <FIG>, the system <NUM> can be part of a medical device such as, for example, a gait trainer, wheelchair, walker, rollator, lift, cart, etc., or it can be part of a commercial, consumer, or industrial device (i.e., non-medical) such as, for example, a cart, chair, vehicle, etc. In one embodiment, system <NUM> includes a selective spring plunger assembly (e.g., see <FIG>) in the stem housing <NUM> to lock the vertical swivel of the caster <NUM> so that caster <NUM> may be oriented to a particular direction (or multiple directions). In one example, that direction may be oriented to that most effective to the use of the anti-reverse feature of caster wheel system <NUM> (e.g., <FIG>). In this manner, the caster wheel <NUM> can selectively swivel or be locked in one or more directions or orientations.

Referring now to <FIG>, one embodiment of a caster wheel system <NUM> is shown. System <NUM> includes a housing <NUM> and selective spring plunger assembly <NUM>. In one embodiment, housing <NUM> has first and second chambers <NUM> and <NUM>. First chamber <NUM> is oriented generally vertical and includes the caster wheel swivel components (e.g., bearings and shaft). Second chamber <NUM> is oriented at an angle relative to first chamber <NUM> and includes components of the selective spring plunger assembly <NUM>. The angle can be any angle so long as second chamber <NUM> directs the plunger assembly <NUM> to lock or unlock the caster wheel swivel assembly. Housing <NUM> is further adapted to be mounted to a supportive frame structure as shown in <FIG>.

In one embodiment, plunger assembly <NUM> includes shaft <NUM>, spring <NUM>, mounting <NUM>, and lever <NUM>. Lever <NUM> has a handle portion <NUM> and a pivot portion <NUM>. Lever <NUM> rotates via pivot portion <NUM>, as shown by arrow <NUM>, between a locked (e.g., <FIG> and an unlocked state for plunger assembly <NUM>. Handle portion <NUM> includes indicia <NUM> indicating the locked or unlocked state of plunger assembly <NUM>. Portion <NUM> includes a fork portion having first and second sides <NUM> and <NUM> with a gap <NUM> therebetween. Gap <NUM> is oriented to accommodate a portion of shaft <NUM> as lever <NUM> is rotated between the locked and unlocked states.

Lever <NUM> further includes hole/opening <NUM> for receiving shaft <NUM> mounting pin <NUM>. Mounting pin <NUM> extends through receiving hole <NUM> in lever <NUM> and receiving hole <NUM> in shaft <NUM> thereby mounting shaft <NUM> to lever <NUM>. As shown in the current embodiment, receiving hole <NUM> is located proximate the perimeter (e.g., off-center) of pivot portion <NUM>. With this arrangement, receiving hole <NUM> displaces vertically when lever <NUM> is rotated and causes shaft <NUM> to move vertically (e.g., extend or retract). As will be further described, this movement of shaft <NUM> causes the plunger assembly to either lock or unlock the swivel of wheel <NUM>. Pivot portion <NUM> bears against plunger mounting <NUM> and is seated and allowed to rotate within an arcuate support section <NUM> thereof as shown. Mounting <NUM> includes a central chamber <NUM> through which shaft <NUM> extends and spring <NUM> resides. Chamber <NUM> captures and seats against an interior surface thereof one end of spring <NUM> so that spring <NUM> does not extend out of chamber <NUM> while a portion of shaft <NUM> can extend therethrough. This allows the other end of spring <NUM> to exert pressure on shaft <NUM> (via shoulder portion <NUM>) as shaft <NUM> is moved within chamber <NUM>. Mounting <NUM> further includes a threaded portion <NUM> for attaching the mounting within second chamber <NUM> of housing <NUM>. Other forms of attachment may also be used.

A collar/washer <NUM> is provided and connected to the caster swivel assembly and rotates when wheel <NUM> swivels. In one embodiment, a space <NUM> is provided on collar <NUM> for receiving shaft <NUM> and locking the caster swivel in a particular direction. Receiving space <NUM> can be a notch in the body of collar <NUM> as shown. In other embodiments, receiving space <NUM> can be a cut-out, aperture, hole, chamber, extension etc. that cooperates with shaft <NUM> to lock and unlock the caster wheel swivel.

So arranged, rotation of lever <NUM> extends and retracts shaft <NUM> under spring <NUM> pressure to locked (e.g., <FIG>) and unlocked the caster wheel swivel assembly. When shaft <NUM> is its extended position (e.g., <FIG>), the end portion of shaft <NUM> is at least partially received within locking space <NUM> and prevents collar <NUM> from rotation, which prevents the caster wheel swivel assembly from swiveling. When shaft <NUM> is its retracted position, the end portion of shaft <NUM> is withdrawn from locking space <NUM> and allows rotation of collar <NUM>, which allows the caster wheel swivel assembly to swivel. In this manner, a simple and convenient caster wheel swivel locking assembly is provided.

Referring now to <FIG> and <FIG>, a suspension system <NUM> is shown. In one embodiment, system <NUM> can be applied to any type of device. As shown in <FIG>, the suspension system <NUM> can be part of a medical device such as, for example, a gait trainer, wheelchair, walker, rollator, lift, cart, etc., or it can be part of a commercial, consumer, or industrial device (i.e., non-medical) such as, for example, a cart, chair, vehicle, etc. In one embodiment, suspension system <NUM> includes an elastomeric or spring assembly <NUM> between two support arms <NUM> and <NUM>. In another embodiment, the position of elastomeric or spring assembly <NUM> between the two support arms is adjustable (e.g., arrow <NUM>) to vary the amount of spring suspension being provided. In this manner, supportive accessories (of, for example, a gait trainer (e.g., harnesses, seatbelts, support straps, etc.)) are provided a natural and tunable spring suspension that is supportive and comfortable to the user.

Referring now to <FIG>, one embodiment of a suspension system <NUM> is shown. Suspension system <NUM> includes, for example, a spring assembly <NUM> and support arms <NUM> and <NUM>. An additional support arm <NUM> may also be provided. Support arms <NUM> and <NUM> are pivotably connected on one end to frame mast portion <NUM> and on the other end to coupling portion <NUM>. Support arm <NUM> is also connected on one end to frame mast portion <NUM> and to actuator <NUM> at another location as shown. Actuator <NUM> is connected on one end to the frame mast portion <NUM> and can extend and retract to vary the angle of support arm <NUM> as indicated by arrow <NUM>.

In one embodiment, spring assembly <NUM> includes a mount body <NUM> and spring/resilient member <NUM>. Mount body <NUM> as first and second sides 1114A, B and a gap/receiving space <NUM>. First and second sides 1114A, B can be fastened together via fastening extensions/projections 1128A,B (and a fastener) to provide a releasable clamp or clamping-type of arrangement. Fastening extensions 1128A,B include an aperture and are located in an upper portion of mount body <NUM>. As shown in the current embodiment, a portion of the body of support arm <NUM> is received in gap <NUM> and affixed thereto via the clamping arrangement. So configured, spring assembly <NUM> can be attached anywhere along the length of support arm <NUM> as represented by arrow <NUM>. In other embodiments, attachment or locking arrangements other than clamping can be used including, for example, a pin plunger and hole(s) or other similar mechanisms.

Spring/resilient member <NUM> can be any spring (compression or otherwise), resilient or elastomeric material or configuration. In the embodiment shown, member <NUM> is elastomeric and includes a generally elliptical or rounded body. In other embodiments, other shapes can be used including circular, helical, cylindrical, monolithic, square, rectangular, etc. Spring member <NUM> includes portions <NUM> and <NUM>. Portion <NUM> represents a contact area were spring member <NUM> makes contact with support arm <NUM>. Portion <NUM> represents a contact and support area were spring member <NUM> makes contact and is connected to a lower portion of mount body <NUM>. Mount body further includes in its lower portion first and second extensions 1126A,B for contact and support relative compression of spring member <NUM>. Spring member <NUM> can compress and decompress in the direction of arrow <NUM> as a load or weight is applied to support arm <NUM>.

In operation, spring assembly <NUM> acts as a load on a class <NUM> lever in the form of support arm <NUM> (where the fulcrum is the pivot connection to frame mast portion <NUM>) in opposition to parallel and opposing support <NUM>. Support arm <NUM> is fixed in position by actuator <NUM> and does not move under load. Spring assembly <NUM> can be located at various positions on support arm <NUM> to tune the amount of suspension provided.

Each position along support arm <NUM> provides a differing amount of suspension, cushioning or stiffness to the system and, hence, the user. For example, when spring assembly <NUM> is located near the lever fulcrum end (i.e., near frame mast portion <NUM>), more suspension or cushioning is provided to support arm <NUM>. In this position, spring member <NUM> experiences significant apparent load from support arm <NUM> resulting in increased compression of spring member <NUM>. This increased compression provides support arm <NUM> with the ability to pivot about its fulcrum (e.g., pivot connection to the frame mast portion <NUM>) under load to provide a degree of cushioning to the user being supported. As spring assembly <NUM> is moved away from fulcrum end (e.g., frame mast portion <NUM>), the apparent load on spring member <NUM> from support arm <NUM> decreases resulting in less compression of spring member <NUM> thereby "stiffening" the suspension system. Hence, a first or greater amount of suspension is provided by positioning spring assembly <NUM> near frame mast portion <NUM> and a second or lesser amount of suspension is provided by positioning spring assembly further away from frame mast portion <NUM>. In this manner, the degree of suspension load required or desired for any individual user can be fine-tuned by the positioning of spring assembly <NUM>.

Referring now to <FIG> and <FIG>, a control assembly <NUM> is shown. In one embodiment, control assembly <NUM> is used to control a cable such as, for example, a Bowden cable that is used for controlling an actuator. As shown in <FIG>, the assembly <NUM> can be part of a medical device such as, for example, a gait trainer, wheelchair, walker, rollator, lift, cart, etc., or it can be part of a commercial, consumer, or industrial device (i.e., non-medical) such as, for example, a cart, chair, vehicle, etc. In one embodiment, the typical pull action required to actuate a Bowden cable (i.e., a flexible wire rope or cable within a semi-rigid jacket) is converted into a more user-friendly pushbutton action. In yet another embodiment, the pushbutton, cable operator (e.g., lever) and cable are approximately inline as opposed to a right angle, which can cause space and clearance issues. In yet another embodiment, a releasable lock can be provided. This allows an operator to select the locked feature as desired and prevent incidental or accidental actuation of the pushbutton.

Referring now to <FIG>, one embodiment of assembly <NUM> includes button <NUM>, lever <NUM>, releasable lock collar <NUM> and cable guide <NUM>. These components can be contained with a housing 1202A,B and in an inline configuration as represented by alignment line <NUM>. In one embodiment, housing 1202A,B includes an aperture <NUM> for button <NUM> and collar <NUM>, a lever shaft receiving hole <NUM>, and a cable guide receiving space <NUM>. Housing 1202A,B is configured as shown to allow pressing of pushbutton <NUM>, pivotal movement of lever <NUM>, and if necessary vertical movement of cable guide <NUM> in actuating a Bowden cable and corresponding actuator cylinder (or the like).

In one embodiment, button <NUM> includes a body/shaft having an extension <NUM>, at least a first channel <NUM>, and at least a first recess <NUM>. Extension <NUM> includes an aperture for connecting button <NUM> to lever <NUM>. This allows movement of button <NUM> to cause pivotal movement of lever <NUM>. Also, a second channel and recess can be included opposite to and similar to first channel <NUM> and first recess <NUM> in the pushbutton <NUM> body/shaft.

In one embodiment, channel <NUM> includes portions <NUM>, <NUM>, and <NUM>. As will be described in more detail, these portions receive lock out extensions (e.g., <NUM> and <NUM> of collar <NUM>). Channel portions <NUM> and <NUM> are positioned along the length of the body of button <NUM> and are offset from each other. Channel portion <NUM> is positioned across (the length of) the body of button <NUM> and connects channel portions <NUM> and <NUM>. So arranged, channel <NUM> forms and orthogonal (i.e., right angles) serpentine shape. Other arrangements and configurations than that shown are also contemplated including varying the size, length, position and shape of each of the channel portions.

Recess <NUM> is also positioned in the body of button <NUM>. In one embodiment, recess <NUM> is spaced separate from and positioned in line with channel portion <NUM>. Recess <NUM> can also be positioned separate from and across channel portion <NUM>. In other embodiments, recess <NUM> can include other positions in the body of button <NUM> including those offset from channel portions <NUM> and <NUM>.

In one embodiment, collar <NUM> is a turn collar having a handle <NUM> connected to a body having upper and lower portions <NUM> and <NUM> and a recessed middle portion <NUM>. Collar <NUM> further includes a button body receiving space <NUM> and first and second projections <NUM> and <NUM>. In one example, projection <NUM> is received in channel <NUM> as a guide to allow vertical movement button <NUM> in actuating the Bowden cable. Projection <NUM> operates in a similar manner in the embodiment where a second channel and recess are provided in button <NUM>. Projections <NUM> (and <NUM> if provided) are moved within channel <NUM> by rotation of collar <NUM>. The recessed portion <NUM> of collar <NUM> receives outer portion of housing aperture <NUM> and allows collar <NUM> to rotate or turn as represented by arrow <NUM>. Rotation of collar <NUM> is aided by use of handle portion <NUM>.

In the embodiment shown, channel <NUM> provides at least two pushbutton states or conditions. Channel portion <NUM> is used during assembly to allow projection <NUM> to enter channel <NUM>. Projection <NUM> is placed in channel portion <NUM> by rotation of collar <NUM> and use of channel portion <NUM>. When projection <NUM> is in channel portion <NUM>, pushbutton <NUM> can be pressed down a distance corresponding to the length of channel portion <NUM>. Thus, channel portion <NUM> corresponds to a first state or position for pushbutton <NUM> and any corresponding actuator controlled by pushbutton <NUM>. This first state can also, for example, represent a direction of movement of the actuator being controlled by pushbutton <NUM> to allow for retraction of the actuator. Thus, channel <NUM> and its portions can be configured to allow for selectable control of an actuator (i.e., movement or no movement).

When projection <NUM> is in channel portion <NUM>, a lockout is achieved. In lockout, projection <NUM> and channel portion <NUM> prevent pushbutton <NUM> from movement. In this manner, incidental or accidental pushbutton <NUM> actuation can be avoided and a second state (i.e., lock out) for pushbutton <NUM> is achieved. Further, as previously described, in additional embodiments a second channel (like channel <NUM>) can also be provided for second extension <NUM> and collectively operate in the same manner described.

In one embodiment, lever <NUM> has first and second portions <NUM> and <NUM> and a central portion having pivot aperture <NUM>. First portion <NUM> includes a hole or aperture for connecting lever <NUM> to button <NUM> (via fastener and extension <NUM> and aperture <NUM>). Second portion <NUM> also includes a hole or other receiving space for connecting to the end of a Bowden cable. A mounting shaft <NUM> extends through pivot aperture <NUM> and hole <NUM> of housing 1202B. So arranged, movement of pushbutton <NUM> causes movement of lever first portion <NUM>. And, movement of lever first portion <NUM> causes movement (opposite movement in this example) of lever second portion <NUM> to which one end of the Bowden cable is connected. This, in turn, causes the wire or cable in the Bowden cable to move within its semi-rigid jacket thereby allowing actuation of an actuator (like actuator <NUM> in <FIG> to, for example, extend or retract). In some embodiments, the Bowden cable controls an actuator in the form of a reciprocating hydraulic cylinder having one or more valves (including, for example, check valves) controlling the flow of hydraulic fluid within the cylinder that allows the cylinder to extend, retract, and/or hold its position. The amount of Bowden cable movement can also control the rate of actuator movement (e.g., in extending, retracting, or holding its position). In essence, lever <NUM> provides a reverse action feature that converts pushbutton <NUM> movement into opposite movement for the Bowden cable connection end (e.g., push movement on the pushbutton is converted to pull movement on the cable, or vice-versa) to appropriately control the actuator.

In one embodiment, cable guide <NUM> is provided and includes a lever receiving space <NUM>, guide aperture <NUM>, and cable opening <NUM> against which the jacket of the Bowden cable can bear against or be fixed thereto. A guide shaft or adjustment screw <NUM> is further provided and connected to cable guide <NUM> through aperture <NUM>. Cable guide <NUM> also has cross-shaped extensions <NUM> on its sides that are received in spaces <NUM> on housing portions 1202A,B. So arranged, guide shaft or adjustment screw <NUM> and housing spaces <NUM> allow cable guide <NUM> to adjust or fine tune the positioning of cable guide <NUM> and, therefore, the position of the attached Bowden cable jacket.

Referring now to <FIG> and <FIG>, one embodiment of center of gravity adjustment system <NUM> is shown. In the example of a gait trainer device (and other load bearing devices), main wheels (e.g., <NUM>) are designed to bear the weight of the user and to provide for ease of maneuverability in turning. System <NUM> enhances that ability by allowing the axle of wheel <NUM> to be placed at or near the vertical axis <NUM> of the user's center of gravity <NUM>. This is accomplished by telescoping frame support members <NUM> to which the wheels <NUM> are attached.

In one embodiment, telescoping support members <NUM> extend and retract as represented by arrow <NUM> from lower frame portions or members <NUM>. In this regard, support members <NUM> are sized so that they may be inserted into lower frame members <NUM> and may slidingly extend therefrom or retract thereinto. A plurality of holes or apertures <NUM> are provided in telescoping support members <NUM> to releasably fix the position of telescoping support members <NUM> relative to lower frame members <NUM>. As shown, the plurality of apertures <NUM> are proximate an end portion of support member <NUM>. However, in other embodiments, the plurality of apertures <NUM> can be positioned anywhere along the length of support member <NUM>.

A plunger assembly <NUM> is provided on lower frame members <NUM> and includes a lock handle and pin. As shown, plunger assembly <NUM> is positioned proximately an end section of lower frame portion <NUM>. In other embodiments, the position of plunger assembly <NUM> can be anywhere along the length of lower frame portion <NUM>. Plunger assembly <NUM> locks and unlocks the telescoping mobility of support member <NUM> and lower frame portion <NUM>. In one embodiment, the plunger assembly <NUM> lock handle releasably extends and retracts the lock pin into and out of a desired hole in the plurality of holes <NUM>.

In operation, the axles of wheels <NUM> that are connected to support members <NUM> are aligned with the vertical axis <NUM> of user's center of gravity <NUM>. Upon alignment, plunger assembly <NUM> and its lock handle are used to extend the pin of the plunger assembly into the nearest hole of the plurality of holes <NUM> to lock the positional adjustment into place. The lock handle of plunger assembly <NUM> is also used to retract the pin of the plunger assembly from the hole when another or further positional adjustment is needed. In one embodiment, the lock handle has a twistable knob that extends the lock pin when the knob is turned in one direction and retracts the pin when the knob is turned in another direction. Furthermore, the pin may be spring-loaded if desired to assist automatic indexing of the plurality of holes <NUM>. In this manner, an indexed center of gravity adjustment is provided that does not require removal and repositioning of wheels <NUM> relative to the frame and support members they are mounted on. The adjustment is accomplished by simple telescoping (e.g., extension and retraction) movement of support members <NUM>.

Claim 1:
A gait trainer (<NUM>) comprising:
a frame (<NUM>) having a lower frame portion (<NUM>, <NUM>, <NUM>) and a vertical frame portion (<NUM>); the lower frame portion (<NUM>, <NUM>, <NUM>) comprising first and second extended frame portions (<NUM>) and a space therebetween; the vertical frame portion (<NUM>) comprising at least one patient support (<NUM>);
a leg rest assembly (<NUM>) coupled to the lower frame portion (<NUM>, <NUM>, <NUM>), characterized in that the leg rest assembly (<NUM>) comprises:
a frame attachment assembly (602A, 602B, 606A, 606B) having first and second spaced apart members (602A, 602B) each having first and second ends, a mounting opening (604A, 604B) proximate the first end and a projection (<NUM>) proximate the second end;
a footplate assembly (<NUM>) pivotably connected proximate to the second end, the footplate assembly (<NUM>) comprising:
substantially planar surface for supporting a foot of a user; and
first and second spaced apart bracket portions (612A, 612B) disposed on sides of the planar surface, each bracket portion (612A, 612B) having first and second openings (<NUM>. <NUM>) for receiving the projection (<NUM>) of a corresponding one of the first and second members (602A, 602B), the first and second openings (<NUM>. <NUM>) limiting the pivotal movement of the footplate assembly (<NUM>).