Patent Description:
The present invention relates to carts and, more particularly, it relates to mechanisms for attaching a cart to a vehicle.

Several types of collapsible and foldable carts for transporting articles or goods have been utilized in the past. Generally, these types of foldable carts are used by home owners for transporting of groceries, packages, luggage, duffle bags, ski equipment, sports gear, musical equipment, and the like. Some of these may have a capability to work at multiple heights as well. These foldable, and/or adjustable height carts are also implemented for commercial and light industry usage in the transporting of in process goods, finished products, tools and construction equipment and the like. <CIT> discloses a cart with an upper portion, a lower portion, wheels, and steering suitable for both maneuvering while in a store, and on more rugged terrain. The cart may be carried suspended from a trailer hitch behind a motor vehicle. The cart has a vertical positioner to raise and lower the upper portion and lower portion relative to the other. The cart may be used as an off-road utility trailer, being towed by a vehicle. From <CIT>, a transportable utility carrier apparatus for coupling to a transport vehicle is known, including an upper frame, a recessed platform connected to the upper frame, a wheeled base, a lift system interposed between the base and the upper frame for moving the wheeled base relative to the platform between a transport position and a freestanding position, a square hitch tube connected to the upper frame, and a rollered receiver hitch mountable to the transport vehicle. The wheels are spaced from the ground in the transport position. The square hitch tube is receivable within the rollered receiver hitch and the rollered receiver hitch eases insertion of the square hitch tube there into to prevent binding on unleveled ground. <CIT> discloses a mobile cargo carrier for mounting onto the rear of a vehicle, the mobile cargo carrier including a storage container having a wheel arrangement, suspension means for removably connecting the storage container to a rear of a vehicle, the suspension means operable to suspend the storage container from the rear of the vehicle above the road surface and jacking means for vertically displacing the storage container relative to the wheel arrangement.

Aspects of the disclosure include a cart and mount secure coupling and receiver system comprising: a cart including: a top deck assembly having a carrying portion, a mount secure coupling and a Secure coupling lock assembly; an undercarriage assembly capable of supporting and adjusting the height of the top deck assembly so that the mount secure coupling is capable of being attached to a secure receiver by the engagement of both the mount secure coupling and the Secure coupling lock assembly.

Further aspects of the disclosure include a method of coupling a cart to a secure receiver: the cart is placed in position with a mount secure coupling mounted on a top deck assembly of the cart substantially aligned with the secure receiver; a hydraulic pump foot pedal coupled to a hydraulic cylinder pump in an undercarriage assembly of the cart receives pumps from a operator to elevate the mount secure coupling above the secure receiver; and a hydraulic release lever is activated to release pressure in the hydraulic cylinder pump to lower the mount secure coupling onto the secure receiver and cause the undercarriage assembly to rise.

Further aspects of the disclosure include a secure receiver comprising: at least one retention tine slot capable of receiving a corresponding at least one mount secure coupling top tine; at least one lower tine reception slot capable of receiving a corresponding at least one mount secure coupling lower tine; and an opening capable of receiving a latch bolt.

Further aspects of the disclosure include a secure receiver comprising: a plurality of retention tine slots capable of receiving a corresponding plurality of mount secure coupling top tines; a plurality of lower tine reception slots capable of receiving a corresponding plurality of mount secure coupling lower tines; and at least one opening capable of receiving a latch bolt. The plurality of mount secure coupling top tines may be self-aligning and self-seating into upper tine retention slots of the secure receiver.

The problems described above are solved according to the invention by the features of the independent claims. Aspects of the embodiments of this invention are illustrated by way of example. While various details of one or more techniques are described herein, other techniques are also possible. In some instances, well-known structures and devices are shown in block diagram form in order to facilitate describing various techniques. A further understanding of the nature and advantages of examples provided by the disclosure can be realized by reference to the remaining portions of the specification and the drawings, wherein like reference numerals are used throughout several drawings to refer to similar components.

Typical carts permit the transport of goods up and down walkways, steep hills, across dirt trails, and the like, without causing damage to walkway surfaces, such as linoleum, tile, wood, or carpeting. However, conventional carts which have been used in the past lack convenience and versatility. For example, they require lifting of materials and/or the cart itself which limits transportability, lacks maneuverability and handling convenience for the various uses to which such carts are put in warehouses and retail establishments. The embodiments described herein address a gap in currently available material handling devices. Although there are many carts available to move materials from place to place, virtually all unpowered devices require manual "lifting" of either the payload (i.e., the carried materials, tools, resources, etc.), the cart, or both at multiple steps of the transportation process. For example, grocery shopping requires loading and unloading of the shopping cart multiple times to get the groceries/merchandise from store shelf to the kitchen pantry in one's house. Many similar examples exist in industrial manufacturing, assembly, and logistics. Examples also exist in commercial construction and professional trades in movement of tools, materials and other resources from point of supply (store/warehouse) to job site, workbench and other points of use. For leisure, sporting events, or adventure travel the same issues exist in attempting to move necessary gear from place to place.

<FIG> show a mobile, height adjustable and vehicle attachable cart <NUM> and its associate coupling mechanisms <NUM>, <NUM> which are the subject of this disclosure from different viewpoints. Mount secure coupling <NUM> with secure receiver <NUM> together form a Mount Secure Coupling & Secure Receiver System for mounting and demounting the cart <NUM> on a vehicle. Cart <NUM> is capable of rolling and is steerable on retractable and stowable wheels. <FIG> is a perspective view of mobile cart <NUM> from the side facing the operator when the cart is being mounted onto a vehicle (the "operator side" <NUM>). <FIG> is a perspective view of the cart <NUM> from the side facing the vehicle during mounting (the "vehicle side" <NUM>). The cart <NUM> has a top deck assembly <NUM> and an undercarriage assembly <NUM> each of which are made up of numerous component parts. <FIG> is an elongated view of the cart <NUM> from the vehicle side <NUM>. <FIG> is a side view of the cart <NUM> from the handle <NUM> side. In <FIG> the cart <NUM> is shown in upright mode with supporting scissor arm pairs <NUM>, <NUM> of the undercarriage assembly <NUM> extended and wheels <NUM>, <NUM> locked out in rolling mode of operation. Mount secure coupling <NUM> on the vehicle side <NUM> of the cart <NUM> allows the cart <NUM> to mate to a secure receiver <NUM> mounted (typically) on the rear of a vehicle which is configured to receive the mount secure coupling <NUM>. (The secure receiver <NUM> is also a "universal coupler" or "hitch coupler" usable on any vehicle with a tow hitch which emphasizes its flexibility). The foot step configuration of the secure receiver <NUM> is an alternative embodiment in which the secure receiver functions as a flat surface step allowing the operator to stand on it. <FIG> is a top view of the cart <NUM> showing deck <NUM> upon which a load may be placed.

The undercarriage assembly <NUM> includes a pair of front (or first) wheels <NUM> which may be rigid and a pair of rear (or second) wheels <NUM> which may swivel (e.g., caster wheels able to turn <NUM> degrees). Both sets of wheels <NUM>, <NUM> are retractable, and rotatable inward and under the undercarriage assembly <NUM> to provide clearance from the ground for the cart <NUM> when the cart <NUM> is mounted on the back of a vehicle. As the vehicle travels, the cart <NUM> will be high enough not to bottom on a highway or catch objects underneath that are in the path of the vehicle (i.e., typically after mounting of the cart on the vehicle the wheels <NUM>, <NUM> will be higher than the lowest feature of the vehicle itself like an oil pan). Secure coupling lock release lever (or secure coupling lock release handle) assembly <NUM> is shown in <FIG> and in more detail in <FIG>. The secure coupling lock release lever assembly <NUM> is capable of providing a way for an operator to easily unlock a secure coupling lock assembly <NUM> from the operator side <NUM> of the cart <NUM> to demount the cart <NUM> from the vehicle. The secure coupling lock release lever assembly <NUM> is made up of a secure coupling lock release lever <NUM> and a secure coupling lock trim <NUM>. The secure coupling lock release lever assembly <NUM> is connected to a secure coupling lock connecting rod <NUM> which in turn connects to and opens a secure coupling lock assembly <NUM> when activated which will be discussed in detail below.

<FIG> also show a brake mechanism of the cart <NUM>. The brake mechanism may include independent caster wheel brakes, mechanical lock of wheel axle or friction on wheel itself, a multi-wheel pressure/friction bar, "deadman" brake with hand release to allow rolling, hand operated top or side wheel caliper brake and/or hand operated drum brake.

<FIG> is a perspective view of the top deck assembly <NUM> of the cart <NUM> and <FIG> shows the top deck assembly with a load <NUM>. Load <NUM> may be a wide variety of items such as coolers, groceries, tool chests, sports equipment, and the like. In terms of weight, in some embodiments, a load <NUM> may typically be up to and including approximately <NUM>,<NUM> (<NUM> pounds). However, in alternative embodiments, the weight of the load <NUM> may be higher than <NUM>,<NUM> (<NUM> pounds) depending on the strength of materials used in the cart <NUM> and/or the vehicle mounted hitch receiver <NUM>. The cart <NUM> is shown in <FIG> with an optional guardrail <NUM> to keep load <NUM> in place during operation. In alternative embodiments without the guardrail <NUM>, larger loads may be placed on the deck <NUM> of the top deck assembly <NUM> without the hindrance of the guardrail <NUM> and secured by other means. <FIG> shows a typical load <NUM> which may be a fully enclosed cargo box or a cover over the deck <NUM>. In alternative embodiments, the guardrail <NUM> could drop down like a tailgate. The guardrail <NUM> could also have attachment devices for attaching accessories.

<FIG>, <FIG>, <FIG> show handle <NUM> which may be used to push or pull the cart <NUM> during operation. The handle <NUM> can remain fixed in place after cart <NUM> is attached to a vehicle or, in an alternative embodiment, it could be folded, collapsed telescopically or otherwise stowed under the cart <NUM>. During a mounting operation of the cart <NUM> to a vehicle <NUM>, the mount secure coupling <NUM> of the top deck assembly <NUM> will be positioned by the operator near the secure receiver <NUM> of the vehicle <NUM>. The cart <NUM> is typically maneuvered into place for mounting through the operator pushing handle <NUM> until the mount secure coupling <NUM> is substantially aligned with and raised over the secure receiver <NUM> as shown in <FIG> which will be discussed in detail below. Handle <NUM> includes a hydraulic pump release lever <NUM> connected by a hydraulic release cable <NUM> to a hydraulic cylinder pump <NUM> located in the undercarriage assembly <NUM>. When activated, the hydraulic pump release lever <NUM> lowers the mount secure coupling <NUM> onto secure receiver <NUM> by releasing pressure in the hydraulic cylinder pump <NUM> which controls the height of the undercarriage assembly <NUM> during coupling of the mount secure coupling <NUM> to the secure receiver <NUM>. <FIG> is a perspective view of the handle of the cart <NUM> before activation of hydraulic pump release lever <NUM>. In <FIG>, lever <NUM> is at rest with the pressure valve of the hydraulic cylinder pump <NUM> (shown in <FIG>) closed before activation. <FIG> is a perspective view of the handle of the cart <NUM> after activation of lever <NUM>. In <FIG> with lever <NUM> activated, the pressure valve of hydraulic cylinder pump <NUM> is opened. Hydraulic pump release lever <NUM> may be used to lower the top deck assembly <NUM> (also described in detail below) while hydraulic pump foot pedal <NUM> may be pumped by the operator to raise the top deck assembly <NUM>. (In an alternative embodiment, instead of a hydraulic cylinder pump <NUM> an electric motor and linear actuator may be used to raise and lower the top deck assembly <NUM> which will be discussed in connection with <FIG>-41D). Once the cart <NUM> is aligned above the secure receiver <NUM>, the operator squeezes the hydraulic pump release lever <NUM> to open the pressure valve releasing pressure in the hydraulic cylinder pump <NUM> and allow cart <NUM> to begin the mounting coupling sequence (or mount secure receiver coupling sequence) of the mount secure coupling <NUM> to the secure receiver <NUM> of the vehicle <NUM> (see <FIG>). The hydraulic pump release lever <NUM> will typically be held in actuated position throughout the mounting coupling sequence process. This allows a sequence of events to unfold including the following: top tines <NUM> and lower tines <NUM> of the mount secure coupling <NUM> descend into the top and bottom openings respectfully in the secure receiver <NUM> which is attached to the vehicle; the secure coupling lock assembly <NUM> engages and secures the cart <NUM>; retraction of the undercarriage assembly <NUM>; and the axle lock trigger releases stow axles <NUM> and folds wheels <NUM>, <NUM> into an inward stowed position under the top deck assembly <NUM>.

<FIG> is a detailed perspective view of the secure coupling lock release lever <NUM> of the secure coupling lock release lever assembly <NUM> shown in a locked position. As a failsafe measure the operator must manually pull the secure coupling release lever <NUM> out to release a secure coupling latch bolt <NUM> from the secure receiver <NUM> to allow the cart <NUM> to be lifted off the secure receiver <NUM> during the detaching of the cart <NUM> from the vehicle. The secure coupling lock latch bolt <NUM> will then reset for the next coupling of the cart <NUM> to the vehicle.

<FIG> is an exploded view of the components of the top deck assembly <NUM>. Deck <NUM> is part of top deck assembly <NUM> to provide support for a load <NUM> placed on the cart <NUM>. Deck assembly <NUM> and individual components; Guardrail <NUM>, handle <NUM> and deck <NUM> may all be made of steel, aluminum, titanium, carbon fiber, or perhaps plastic (e.g., the deck surface). In alternative embodiments the handle <NUM> could be attached to the undercarriage <NUM>.

<FIG> is a perspective exploded view of the mount secure coupling <NUM> which is attached to cart <NUM> and, as previously discussed, forms the cart side coupler which attaches to secure receiver <NUM> mounted on a vehicle <NUM>. The mount secure coupling <NUM> is an assembly of components made up of a mount secure coupling plate <NUM> with mount secure coupling lower tines <NUM>; a mount secure coupling top <NUM> with mount secure coupling top tines <NUM>; and axle lock trigger <NUM>. The mount secure coupling components can typically be made of strong, durable materials such as steel. The mount secure coupling top tines <NUM> may be self-aligning and self-seating into upper tine retention slots <NUM>.

<FIG> is a perspective view of the undercarriage assembly <NUM> of the cart <NUM> without the top deck assembly <NUM> shown. <FIG> is an exploded view of the parts making up the undercarriage assembly <NUM>. The undercarriage assembly <NUM> includes mechanisms to achieve extension (or lift) and retraction (or lowering) of the top deck assembly <NUM>. Hydraulic cylinder pump <NUM> operates a pair of lift scissors <NUM>, <NUM> for retraction and extension to allow the top deck assembly <NUM> to change its height. The scissors are made up of a first scissor arm pair <NUM> and second scissor arm pair <NUM>. Alternative embodiments could use double/multi scissor arm pairs. <FIG> shows the cart <NUM> with the first scissor arm pair <NUM> and second scissor arm pair in full extension which would correspond to the top deck assembly <NUM> being at its highest height. As the top deck assembly <NUM> descends and mount secure coupling <NUM> mounts onto secure receiver <NUM> through mechanisms discussed below, a pair of axles capable of stowing the wheels <NUM>, <NUM> (i.e., "stow axles") <NUM> rotate to allow the wheels <NUM>, <NUM> to be lifted up and turned inward until they are fully retracted (or hidden) during the process when the cart <NUM> is being attached to the vehicle. A pair of subframe tracks <NUM> arranged substantially in parallel allow small scissor arm pair wheels <NUM> connected to each of the first scissor arm pair <NUM> and second scissor arm pair <NUM> to move in a substantially horizontal direction as the scissor arm pairs <NUM>, <NUM> and top deck assembly <NUM> move through different heights during extension and retraction. A pair of return springs <NUM> are configured to pull the scissor arm pairs <NUM>, <NUM> back into a retraction position from the extension position upon mounting of the cart <NUM> onto the secure receiver <NUM>. The return springs <NUM> can be simple coil, gas springs or another type of tension spring configuration, including internal within the hydraulic cylinder itself. A pair of axle rotation cams <NUM> are connected to and rotate with the stow axles <NUM> to assist with the wheels <NUM>, <NUM> folding inward towards the top deck assembly <NUM>. Hydraulic pump foot pedal <NUM> when activated by the operator puts more pressure into the hydraulic pump cylinder <NUM> to allow for control of the height of the top deck assembly <NUM>. In particular, during attachment and detachment of the cart <NUM> to and from the vehicle through the use of the operator's foot in a pumping action the operator can extend the scissor arm pairs <NUM>, <NUM> and elevate the cart <NUM>. As the operator approaches the back of the vehicle with the cart <NUM>, the operator will provide force to pump the pedal <NUM> and raise the cart <NUM> so that the mount secure coupling <NUM> is located over the secure receiver <NUM> attached to the vehicle. The operator will then align the mount secure coupling <NUM> above the secure receiver <NUM> and over the upper tine retention slots <NUM>. This allows for attachment of the mount secure coupling <NUM> with the secure receiver <NUM> as described in more detail below. Correspondingly, the operator will pump the pedal <NUM> when the cart <NUM> is attached to the vehicle to extend the scissor arm pairs <NUM>,<NUM> and raise the top deck assembly <NUM> high enough to allow for detachment of the mount secure coupling <NUM> from the secure receiver <NUM> which also be described below in detail.

<FIG> is a cross-sectional view of the top deck assembly <NUM> of the cart <NUM> showing how the secure coupling lock lever assembly <NUM> is coupled through a secure coupling lock connecting rod <NUM> which runs the width of the cart <NUM> from the operator side <NUM> to the vehicle side <NUM> to control operation of a secure coupling lock assembly <NUM>. The secure coupling lock assembly <NUM> is positioned as substantially centrally located on the long side of the mount secure coupling <NUM>. <FIG> is a perspective detailed exploded view of the components of the secure coupling lock assembly <NUM>. During operation, the secure coupling lock connecting rod <NUM> slides in and out of a secure coupling lock bracket <NUM> as far as permitted by secure coupling lock connecting rod stop pin <NUM>. As a conscious failsafe measure the operator will need to manually pull the secure coupling lock release lever <NUM> out to retract the passive latch bolt <NUM> from the secure receiver <NUM>. The passive latch bolt <NUM> is held back by the secure coupling locking catch (or sear) <NUM> to allow the cart <NUM> to be lifted off the secure receiver <NUM>. Further components which make up the secure coupling lock assembly <NUM> and the functions of which will be described further below include the following: secure coupling lock release <NUM>; secure coupling lock release guide pin <NUM>; secure coupling lock latch bolt <NUM>; secure coupling lock latch bolt pin <NUM>; secure coupling lock latch bolt spring <NUM>; secure coupling locking catch slot <NUM>; secure coupling locking catch <NUM>; secure coupling release springs <NUM>; and secure coupling catch springs <NUM>.

<FIG> is a perspective of a vehicle mounted (or trailer mounted) hitch receiver <NUM> shown attached to a hitch receiver mounting arm & bracket <NUM> configured to connect to a vehicle <NUM>. <FIG> is a perspective view of the secure receiver <NUM> by itself and <FIG> is a perspective view of a load bar adjustable extender <NUM>. These elements <NUM>, <NUM> in combination are shown in <FIG> ready for attachment to the vehicle mounted hitch receiver <NUM>. The load bar adjustable extender <NUM> can be used in an up or down orientation to adjust for varying centerline heights of the vehicle mounted hitch receiver <NUM>. In <FIG>, the load bar adjustable extender <NUM> is shown in a down position. <FIG> illustrates the secure receiver <NUM> mounted on the load bar adjustable extender <NUM> (which is in an up position). In an alternative embodiment, the secure receiver <NUM> and load bar adjustable extender <NUM> could be one integrated piece. The secure receiver <NUM> is shown attached to the load bar adjustable extender <NUM>, vehicle mounted hitch receiver <NUM> and a vehicle <NUM> in <FIG>. In addition to acting as an attachment mechanism for the mount secure coupling <NUM> of cart <NUM>, the secure receiver <NUM> may act as a foot step when configured in a step shape. This secure receiver as a step configuration would be able to support the operator's weight and enable the operator to reach into the cargo area of the vehicle, the bed of a pickup, and/or the roof of the vehicle <NUM>.

The secure receiver <NUM> is a device to substantially align, safe-secure couple and lock a cart <NUM> to the hitch receiver <NUM> using mount secure coupling <NUM>. As the cart <NUM> is mounted on the secure receiver <NUM> this mounting process will also allow for inward turning and clearance of the retracted wheels <NUM>, <NUM> of the cart <NUM> from the ground. Referring to both <FIG> with regard to the mount secure coupling <NUM> and <FIG> secure receiver <NUM>, has a lower flange <NUM> containing lower tine retention slots <NUM>. These slots <NUM> receive corresponding mount secure coupling lower tines <NUM> of mount secure coupling <NUM> when the mount secure coupling <NUM> mates with the secure receiver <NUM>. During coupling of the cart <NUM> to the vehicle, the secure coupling lock latch bolt <NUM> slides along the face of the secure receiver <NUM> and inserts itself into secure coupling lock opening <NUM>. Upper tine retention slots <NUM> of secure receiver <NUM> receive corresponding top tines <NUM> of the mount secure coupling <NUM> upon coupling. Collectively, inserting the mount secure coupling top tines <NUM>, mount secure coupling lower tines <NUM> and the secure coupling lock latch bolt <NUM> into their respective openings in the secure receiver <NUM> constrain, secure and safely lock the cart <NUM> to the vehicle <NUM> to withstand substantially all dynamic and static forces the cart <NUM> will encounter (i.e., shear, torsion, and rotational/torque forces) while stationary or moving across mostly any surface.

<FIG> illustrate a side view and <FIG> illustrate a top view of the initial steps of coupling the cart <NUM> onto a vehicle <NUM> and turning the cart <NUM> into an attached carrier. The cart <NUM> is rolled up to the vehicle <NUM> and the operator will then elevate the cart <NUM> (see arrow <NUM> in <FIG>) by pumping the hydraulic pump foot pedal <NUM> connected to hydraulic cylinder pump <NUM> until the mount secure coupling <NUM> is raised to a height over the secure receiver <NUM>. The operator then visually substantially aligns the mount secure coupling <NUM> and the mount secure coupling top tines <NUM> of the cart <NUM> with the upper tine retention slots <NUM> of the secure receiver <NUM> of the vehicle <NUM> as shown in <FIG>.

<FIG> shows a detailed side perspective view of a cutaway section of the cart <NUM> with the mount secure coupling <NUM> located above and substantially aligned with secure receiver <NUM>. Upon activation of the hydraulic pump release lever <NUM> on handle <NUM> to lower the top deck assembly <NUM> (and subsequently raise the undercarriage assembly <NUM> which will be discussed in detail below), the mount secure coupling top tines <NUM> descend into the upper tine retention slots <NUM> as shown in <FIG>. As a result, the inner radius of the top tines <NUM> come to rest on a radiused edge of the secure receiver <NUM>. Simultaneously, the mount secure coupling lower tines <NUM> slide into the lower tine retention slots <NUM> of the lower flange <NUM> of the secure receiver <NUM> as shown in <FIG>. The top tines <NUM> along with the contact surfaces of the secure receiver <NUM> and mount secure coupling <NUM> support the payload weight of the cart <NUM> and its load <NUM>. The lower tines <NUM> prevent the mount secure coupling <NUM> from hopping or bouncing out of the secure receiver <NUM>, in particular, in a rotational or counter rotational direction. Additionally, on descent, the secure coupling lock latch bolt <NUM> of the secure coupling lock assembly <NUM> of cart <NUM> (see <FIG>, <FIG>) is pressured (or projected) out by secure coupling lock latch bolt spring <NUM> to slide along the face of secure receiver <NUM> and into place inside the secure coupling lock opening <NUM> on the secure receiver <NUM> to secure the cart <NUM> from coming out of the secure receiver <NUM> in a substantially vertical shear direction. This allows for secure coupling locking and containment of the cart <NUM> on the secure receiver <NUM> against approximately all dynamic force directions. The structural integrity of the top deck assembly <NUM> and secure receiver are capable of self-supporting entirety of cart <NUM> and payload <NUM> weight.

<FIG> show the secure coupling locking system between the mount secure coupling <NUM> and the secure receiver <NUM> in a locking sequence in detail. In <FIG>, secure coupling lock latch bolt <NUM> is in the unlocked latch bolt position in reset and ready to auto lock upon next descent of the top deck assembly <NUM> with mount secure coupling <NUM>. In <FIG>, the cart <NUM> is shown descending with mount secure coupling top tines <NUM> lowering into the upper tine retention slots <NUM> on top of secure receiver <NUM>. In <FIG>, secure coupling lock latch bolt <NUM> rides along the face of secure receiver <NUM> and pressurized by pushing back on Secure coupling lock latch bolt spring <NUM> (e.g., a compression spring) until reaching Secure coupling lock opening <NUM> in the secure receiver <NUM> where it inserts itself as shown in <FIG>. In <FIG>, the secure coupling lock is fully "locked" with secure coupling lock latch bolt <NUM> inside secure coupling lock opening <NUM>. Cart <NUM> is now securely mounted and locked to secure receiver <NUM>.

<FIG> show the elements of the cart <NUM> involved in the retraction of the undercarriage assembly <NUM>, rotation of stow axles <NUM> and folding and stowing of wheels <NUM>, <NUM>. As shown in <FIG>, as the cart <NUM> descends on the secure receiver <NUM>, an axle lock trigger <NUM> which is housed behind mount secure coupling <NUM> and underneath top tines <NUM> is pushed back and rotated about the shoulder bolt that holds it within its bracket and also acts as an axis pivot (as shown by arrow <NUM> in <FIG>). This rotation action of the axle lock trigger <NUM> pulls the axle lock trigger cable <NUM> back (as shown by arrow <NUM> in <FIG>). The axle lock trigger <NUM> is connected to both axle locking mechanisms <NUM> through axle lock <NUM>-into-<NUM> cable splitter <NUM> (see <FIG>) which retracts the duality of axle locking mechanism's axle lock release block <NUM> (see <FIG>) and allows the stow axles <NUM> to rotate in their respective axle bearing mounts <NUM>. <FIG> shows the axle rotation cams <NUM> operation of which will be discussed below.

<FIG> show operation of the elements of the undercarriage assembly <NUM> involved in the rotation of the stow axles <NUM> and the folding inward and stowing of wheels <NUM>, <NUM>. In <FIG>, the axle lock trigger cable <NUM> attached to the axle lock trigger <NUM> pulls axle release block <NUM> (see <FIG>) back against a compression spring <NUM> as shown in <FIG> (see arrow <NUM>) which frees the axle rotation cam <NUM> to rotate (see arrow <NUM>) as return springs <NUM> retract and axle rotation cams <NUM> contact top deck assembly <NUM>. An axle lock secondary cam <NUM> (<FIG>) on the axle rotation cam <NUM> deflects the axle locking mechanism latch <NUM> out of the axle locking latch slot <NUM> in the axle lock release block <NUM> (<FIG>, <FIG>) as axle rotation cam <NUM> rotates as shown in <FIG>. In <FIG>, stow axles <NUM> are rotating the wheels <NUM>, <NUM> inward and the axle locking mechanism latch <NUM> will come to rest on the top surface of axle lock release block <NUM> as shown in <FIG> where it will remain ready for re-latching when the wheels are re-deployed. In <FIG>, stow axles <NUM> are shown fully rotated and wheels <NUM>, <NUM> are folded in a stowed position where they are held in place by the retracted force of the return springs <NUM> and effectively positioning the axle locking mechanism <NUM> for redeploying the wheels.

<FIG> show further elements of the cart <NUM> involved in rotation of the stow axles <NUM> and wheels <NUM>, <NUM> folding and stowage with an emphasis on the wheels stowage. In <FIG> and in <FIG>, wheel element <NUM> is shown in the foreground immediately adjacent to the axle locking mechanism <NUM> to represent how the axle locking mechanism "unlocks" and the axles freely rotate within the axle bearing mounts <NUM> to stow the wheels inward and upward under top deck assembly <NUM>. In <FIG> the operator side wheels <NUM> are not shown but the front wheel pair <NUM> are shown indicating their dependency on the same activation and their rotation inward and upward. In <FIG>, when the top tines <NUM> of the mount secure coupling <NUM> seat into the upper tine retention slots <NUM> of the secure receiver <NUM> and are constrained from descending further, the undercarriage assembly <NUM> retracts (or lifts as shown by arrow <NUM>) by force of return springs <NUM>. In <FIG>, axle rotating cam <NUM> is also brought into contact with the underside of top deck assembly <NUM> by the force of return springs <NUM>. It is dependent on the axle lock trigger <NUM> pulling axle lock trip cable <NUM> to release axle lock release block <NUM> (see <FIG>) freeing stow axle <NUM> to rotate inside axle bearing mounts <NUM> (as shown by arrow <NUM>). Wheels <NUM>, <NUM> fold up as shown in <FIG> as a dependent action to the undercarriage assembly <NUM> being retracted (i.e., ascending) by the tension/pull force of the return springs <NUM>. As the undercarriage assembly <NUM> ascends the axle rotation cam <NUM> stays in contact with top deck assembly <NUM> (as shown in <FIG>) which rotates the axle <NUM> inside the axle bearing mounts <NUM> and folds the wheels <NUM>, <NUM> up and inward. <FIG> all depict various stages of this stowing process from the axle rotation cam <NUM> contacting the underside of top deck assembly <NUM> and creating rotation of the stow axles <NUM> as contact continues along the top radius of axle rotation cams <NUM>. As the undercarriage assembly <NUM> continues to be retracted upward, the stow axle <NUM> travels through <NUM> degrees approximate to the horizontal and comes to rest as shown in <FIG>. This wheel stowage operation is occurring simultaneously on both stow axles <NUM> and all four wheels <NUM>, <NUM> although it is only shown depicted on one wheel in <FIG>.

<FIG> show another view of the undercarriage assembly <NUM> retraction and wheel folding and stowing of the cart <NUM> during the mounting of the cart <NUM> onto the vehicle <NUM>. As shown in <FIG>, the operator pulls hydraulic pump release lever <NUM> to activate hydraulic handle cable <NUM> attached to hydraulic cylinder pump <NUM> release valve. This action simultaneously lowers the top deck assembly <NUM> to allow the mount secure coupling <NUM> to descend on and mount (e.g., secure) to the secure receiver <NUM> and subsequently allowing for raising of the undercarriage assembly <NUM>. When the mount secure coupling top tines <NUM> have bottomed onto the radiused edge of the secure receiver <NUM>, the top deck assembly <NUM> is constrained and the remaining hydraulic cylinder pump <NUM> pressure is overcome by the return spring <NUM> tension force. The return springs <NUM> are shown externally connected to the undercarriage assembly <NUM> and lift it up (in alternative embodiments the return springs could be internal within the hydraulic cylinder), retracting the undercarriage assembly <NUM> underneath the top deck assembly <NUM>. As the return springs <NUM> retract the undercarriage assembly <NUM> underneath the top deck assembly <NUM>, and with the axle locking mechanism <NUM> retracted the stow axles <NUM> are free to rotate inside the axle bearings <NUM>. Further, the bottom surface of the top deck assembly <NUM> contacts the axle rotation cam <NUM>. This provides a force and path to rotate the stow axles <NUM> and connected wheels <NUM>, <NUM> inward and underneath the top deck assembly <NUM>. Simultaneously, as shown in <FIG> and <FIG>, the undercarriage assembly <NUM> retracts and wheels <NUM>, <NUM> are turned in and stored allowing proper clearance from the ground for operation of the vehicle <NUM>. In <FIG>, the cart <NUM> is safely and securely locked in place, the undercarriage assembly <NUM> including wheels <NUM>, <NUM> are retracted and the operator is able to drive the vehicle <NUM> off.

The discussion will now turn to removing (or demounting) the cart <NUM> from the vehicle <NUM>. <FIG> and <FIG> show the deployment and lock out of the wheels <NUM>, <NUM> during uncoupling of the cart <NUM> from the vehicle <NUM>. In <FIG> and <FIG>, to uncouple the cart <NUM> the operator will unlock the secure coupling release lever <NUM>, pulling the secure coupling lock latch bolt <NUM> out of secure coupling lock opening <NUM> and allowing the cart <NUM> freedom to rise above the secure receiver <NUM>. As shown in <FIG> and <FIG>, the operator will use the hydraulic pump foot pedal <NUM> to deploy the undercarriage assembly <NUM>. As the hydraulic cylinder pump <NUM> is pressurized, the scissor arm pairs <NUM>, <NUM> move along their subframe tracks <NUM> (as shown in <FIG> and <FIG>) and thereby extending the scissor arm pairs <NUM>, <NUM> and effectively lowering undercarriage assembly <NUM> toward the ground. As undercarriage assembly <NUM> descends, the axle rotation cam <NUM>, the stow axle <NUM> and wheels <NUM>, <NUM> will rotate until they reach an approximately ninety degree vertical position as shown in <FIG>. The axle lock trigger <NUM> and axle locking mechanism <NUM> will reset to "locked" and prohibit the stow axles <NUM> from rotating when undercarriage assembly <NUM> including wheels <NUM>, <NUM> are fully extended. The operator will continue to pump the hydraulic pump foot pedal <NUM> and the top deck assembly <NUM> will gradually lose contact with the secure receiver <NUM> as the mount secure coupling top tines <NUM> and mount secure coupling lower tines <NUM> of the mount secure coupling <NUM> rise above the secure receiver <NUM>. The cart <NUM> is then elevated from the secure receiver <NUM> and released. The cart <NUM> is now able to be rolled away as shown in <FIG> with the secure receiver <NUM> remaining on the vehicle <NUM> as shown in <FIG>.

<FIG> show the locking system unlocking and retraction sequence in detail during uncoupling of the cart <NUM> from the vehicle <NUM>. In <FIG>, the secure coupling lock assembly <NUM> is fully "locked" with secure coupling lock latch bolt <NUM> inside secure coupling lock opening <NUM>. In <FIG>, secure coupling lock release lever <NUM> is "pulled" which causes secure coupling lock connecting rod <NUM> to extract the secure receiver latch bolt <NUM> from secure receiver <NUM> positioned above secure coupling locking catch <NUM>. This allows the secure receiver catch springs <NUM> to pull the secure coupling locking catch <NUM> into a secure coupling locking catch slot <NUM> on the secure coupling lock latch bolt <NUM> and hold it in a retracted position as shown in <FIG>. In <FIG>, as cart <NUM> rises for takeoff from secure receiver <NUM> the secure coupling lock release <NUM> slides up the face of the secure receiver <NUM> along its angular top geometry and out of secure coupling lock opening <NUM>. This begins to slide/push the secure coupling lock release <NUM> backwards and push the secure coupling locking catch <NUM> down via the angled bottom surface <NUM> of the secure coupling lock release <NUM> (<FIG>). As the cart <NUM> continues to rise the secure coupling locking catch <NUM> disengages from the secure coupling locking catch slot <NUM> in the bottom of secure coupling lock latch bolt <NUM> freeing it to spring forward from the force of the secure coupling lock latch bolt spring <NUM> to reset to a fully extended position as shown in <FIG>. In <FIG>, secure coupling lock assembly <NUM> is fully unlocked and the unlocked secure coupling lock latch bolt <NUM> is in reset position ready to auto lock upon the next descent of the top deck assembly <NUM> and mount secure coupling <NUM> onto the secure receiver <NUM>.

<FIG> are cross sectional views of cart <NUM> and show the elements of the mount secure coupling <NUM> involved in the stow axle <NUM> rotation and wheel <NUM>, <NUM> unfolding and unstowing. <FIG> shows axle lock trigger <NUM> inside the mount secure coupling <NUM> as the top deck assembly <NUM> rises. <FIG> illustrates that as the cart <NUM> lifts off the secure receiver <NUM>, the axle lock trigger <NUM> is pushed inward and a connected cable <NUM> is pulled (as shown by arrow <NUM>) through a <NUM>-into-<NUM> cable splitter <NUM> (see <FIG>). This action releases the axle lock release block <NUM> (shown in <FIG>) freeing each stow axles <NUM> to rotate inside axle bearing mounts <NUM>.

<FIG> illustrate a perspective view of deployment of the wheels <NUM>, <NUM> during uncoupling of the cart <NUM> from the vehicle <NUM>. As an independent action, the operator pulls secure coupling lock release lever <NUM> to allow cart <NUM> to be uncoupled from secure receiver <NUM>. As a next step, the operator then begins to pump the hydraulic foot pump pedal <NUM> and the hydraulic cylinder pump <NUM> will build pressure and force the return springs <NUM> and scissor arm pairs <NUM>,<NUM> to extend which will move the undercarriage assembly <NUM> downward toward the ground. This action allows axle rotation cams <NUM> to rotate about the bottom surface of top deck assembly <NUM> until fully losing contact with the top deck assembly <NUM> and allows gravity force of wheels <NUM>, <NUM> and force of tension springs <NUM> (<FIG>) to assist rotation of stow axles <NUM> (see arrow <NUM>) inside axle bearing mounts <NUM> back to substantially vertical and engaging axle locking mechanism latch <NUM> into axle locking latch slot <NUM> on axle lock release block <NUM> of axle locking mechanism <NUM>. Stow axles <NUM> are now locked (<FIG>) with the wheels <NUM>, <NUM> fully extended and ready to roll.

<FIG> is bottom view of the cart <NUM> showing the operation of the hydraulic pump release lever <NUM>, hydraulic release cable <NUM> and axle lock trigger cable <NUM>. The axle lock trigger cable <NUM> splits into first axle lock trigger cable split 167a and second axle lock trigger cable split 167b. Hydraulic release cable <NUM> connects hydraulic pump release lever <NUM> directly to a hydraulic pump <NUM> release valve to release pressure when pulled by operator. Axle lock trigger cable <NUM> connects axle lock trigger <NUM> to axle lock <NUM>-to-<NUM> cable splitter <NUM>. When cart <NUM> descends onto secure receiver <NUM>, axle lock trigger <NUM> deflects and pulls axle lock trigger cable <NUM>. At axle lock <NUM>-to-<NUM> cable splitter <NUM>, the axle lock trigger cable <NUM> splits into first axle lock trigger cable split 167a and second axle trigger cable split 167b which connect to axle locking mechanisms <NUM> to unlock stow axles <NUM>.

<FIG> are views of an alternative embodiment of the undercarriage assembly. <FIG> is top view of an alternative embodiment of the undercarriage assembly showing a linear actuator <NUM> and a battery receiver <NUM>. Electro-mechanical actuators are similar to mechanical actuators (e.g., hydraulic cylinder pump <NUM>) except that the source of power/leverage is replaced with an electric motor. Rotary motion of the motor is converted to linear displacement. The following is a description of the electro-mechanical linear actuator <NUM> used in this alternative embodiment. An electric motor is mechanically connected to rotate a lead screw. A lead screw has a continuous helical thread machined on its circumference running along the length (similar to the thread on a bolt). Threaded onto the lead screw is a lead nut or ball nut with corresponding helical threads. The nut is prevented from rotating with the lead screw (the nut interlocks with a non-rotating part of the actuator body). Therefore, when the lead screw is rotated, the nut will be driven along the threads. The direction of motion of the nut depends on the direction of rotation of the lead screw. By connecting linkages to the nut, the motion can be converted to usable linear displacement. There are many types of motors that can be used in linear actuator <NUM>. These include DC brush, DC brushless, stepper, or in some cases, even induction motors. The linear actuator <NUM> will commonly have the motor as a separate cylinder attached to the side of the linear actuator <NUM>, either parallel with the actuator or perpendicular to the actuator. In this disclosure, a battery powered (DC) linear actuator <NUM> with the motor <NUM> attached to the side in parallel is used. In this embodiment, the linear motion of the hydraulic actuator is replaced by the electro-mechanical linear actuator with internal lead screw. The DC motor <NUM> replaces the need for the foot pump <NUM>, and since the linear motion is controlled in both extension and retraction the external return springs <NUM> can be eliminated in this alternative embodiment (i.e., the powered retraction cycle acts as a hydraulic cylinder would with an internal return spring). Moreover, the axle locking mechanisms <NUM> in their entirety are eliminated as the linear actuator are controlled to specific stop points through limit or proximity switches. A limit or proximity switch replaces the axle lock trigger <NUM> to indicate coupling of cart <NUM> to secure receiver <NUM> is complete, and allow the full undercarriage assembly <NUM> retraction and stowing cycle for stow axles <NUM> and wheels <NUM>, <NUM>. Stow axles <NUM> are free to rotate within axle bearing mounts <NUM>, but constrained rigid in any location including extended and vertical deployment by direct attachment to the linear actuator lead screw of the linear actuator <NUM>. <FIG> shows a battery <NUM> (e.g., <NUM> volts) in relation to the battery receiver <NUM>. <FIG> shows the first and second scissor arm pairs <NUM>, <NUM> extended to lift the top deck assembly <NUM>. <FIG> shows the first and second scissor arm pairs <NUM>, <NUM> retracted to lower the top deck assembly. <FIG> is an elongated view cutaway with battery <NUM> shown.

<FIG> show the depression of switch <NUM> to lower first and second scissor arm pairs <NUM>, <NUM> for the mount secure coupling <NUM> to dock into secure receiver <NUM>. In <FIG> a toggle or rocker switch <NUM> (e.g., double pole, double throw rocker switches with momentary on) in "neutral/stop" position is shown and correspondingly in <FIG> the mount secure coupling <NUM> is substantially aligned and prepared to descend onto the secure receiver <NUM>. In <FIG>, switch <NUM> is depressed to descend the mount secure coupling <NUM> and retract the undercarriage assembly <NUM> into the top deck assembly. As shown in <FIG>, upon safe seating of the mount secure coupling <NUM> into the secure receiver <NUM>, a proximity or limit switch would sense/indicate or make contact (indicating safe to continue) to allow the linear actuator <NUM> to continue to travel to full retraction.

<FIG> depict the continuation of the retraction of the undercarriage assembly <NUM> by power of the linear actuator <NUM> as it travels to home position. The stow axles <NUM> freely rotating in their axle bearing mounts <NUM> and rotate when the axle rotation cam <NUM> contacts the underside of the top deck assembly (as like the first embodiment) folding the wheels <NUM>, <NUM> up and in.

<FIG> shows depression of toggle switch to deploy undercarriage assembly <NUM> and wheels <NUM>, <NUM>. <FIG> shows the switch <NUM> in a neutral position with the cart <NUM> mounted on the vehicle <NUM> as shown in <FIG>. In <FIG>, the switch <NUM> has been depressed and when energizing the switch in this direction the linear actuator <NUM> shaft will extend pushing the scissor pairs <NUM>, <NUM> in the tracks and extending the undercarriage assembly <NUM> down. The stow axles <NUM> will rotate down till the wheels <NUM>, <NUM> are vertical and ready to contact the road surface. Continuing to depress the switch will continue to extend the linear actuator <NUM> shaft and scissor arm pairs <NUM>, <NUM> until the top deck assembly <NUM> ascends above the secure receiver <NUM> and the cart <NUM> can be rolled away.

<FIG> show another alternative embodiment of the cart <NUM> with the secure coupling lock release lever assembly <NUM> having an associated key lock <NUM> to prevent the secure coupling lock release lever <NUM> from leaving a locked position when the key lock <NUM> is also locked. This will provide security to prevent someone from taking the cart <NUM> without permission. The secure coupling lock release lever assembly <NUM> shown in <FIG> is key locked and secure coupling lock release lever assembly <NUM> locked. <FIG> is key unlocked and secure coupling lock release lever assembly <NUM> unlocked. <FIG> is key unlocked and secure coupling lock release lever assembly <NUM> unlocked which would allow cart <NUM> to be removed from secure receiver <NUM>.

<FIG> shows an alternative embodiment of the secure receiver <NUM> with a sliding shim <NUM> attached directly to the load bar extender <NUM> (see <FIG>). As shown in <FIG> the sliding or rotational shim is attached to the load bar extender <NUM> through a fastener mechanism <NUM> such as a screw (as shown) or a rivet, or similar. <FIG> is a side view of the shim <NUM> mounted on the load bar extender <NUM>. Sliding and rotating shim <NUM> adds rigidity and prevents wobbling of the secure receiver <NUM> and therefore the cart <NUM> when it is attached to a vehicle <NUM>. Sliding and rotating shim <NUM> is capable of sliding back and forth along shim slot <NUM> or rotating about its fastener to conveniently insert or remove to and from a vehicle mounted hitch receiver <NUM> (see <FIG>) to take up tolerance gap between the mating parts and minimize unwanted play or wobble. Shim grip <NUM> allows for easy hand location and moving of the sliding and rotating shim <NUM> into the gap between the mating surfaces of the load bar extender <NUM> and the hitch receiver <NUM>. <FIG> is a bottom view of sliding and rotating shim <NUM> inserted between the load bar extender <NUM> and hitch receiver <NUM>.

<FIG> shows another alternative embodiment of the cart <NUM> which operates through manual lift on and off of the cart <NUM> and mount secure coupling <NUM> to the secure receiver <NUM>. The coupling of the mount secure coupling <NUM> to the secure receiver <NUM> is accomplished in the same way as described above but without the assistance of the hydraulic cylinder pump or linear actuator. In this embodiment, the top deck assembly <NUM> is manually maneuvered into place by an operator (or a plurality of operators depending on the weight of the load). This alternative embodiment of the cart <NUM> is lower cost and lighter weight, and may or may not have wheels.

<FIG> show another alternative embodiment of the cart with manual wheel (<NUM>, <NUM>) folding. Fold down handle <NUM> is capable of being unlatched and dropped down approximately ninety degrees until in line with a pair of nesting tubes <NUM>. Pins attached to the fold down handle <NUM> and protruding through nesting tube <NUM> will travel along a spiral barrel cam mechanism <NUM> cut into the wheel mounts. As the fold down handle <NUM> is pushed in, the travel of the pins through the spiral groove of the barrel cam will cause the nesting tube <NUM> and attached wheel mounts to rotate thereby causing the wheels to fold up. Arrow <NUM> in <FIG> shows fold down and push in fold down handle <NUM> into nesting tubes <NUM>. <FIG> is a perspective view. <FIG> is a top view of undercarriage assembly showing barrel cams and nesting tubes. <FIG> shows fold down handle pushed in and wheels <NUM>, <NUM> folded up.

<FIG> illustrate an alternative embodiment of the cart <NUM> showing the top deck assembly <NUM> having a bicycle deck <NUM> configured to carry a load of bicycles. This embodiment has the ability to mount and/or attach many accessories including cargo boxes, bike racks, ski containers, and the like. Attachment mechanisms would include thumb screws, lever locks, quick release latches and the like. <FIG> and <FIG> show a universal dock surface with attachment mechanisms like grooves, t-slots, contours. Also, along perimeter surface of frame of cart <NUM>. Combinations of accessories possible such as boxes, containers and racks, baskets, and the like.

<FIG> show an alternative embodiment of the secure receiver <NUM> having a different configurations. In <FIG>, a round bar element <NUM> at upper tine retention slots <NUM> functions to improve self alignment of mount secure coupling top tines <NUM> when coupling (i.e., upon descent of top deck assembly <NUM>). This also results in reduction of friction and better engagement seating for the mount secure coupling <NUM> upon mounting of the cart <NUM>. <FIG> illustrates a leveling pin <NUM> with self contained leveling adjustment roller <NUM> and set screw <NUM>. Set screw <NUM> is threaded into leveling adjustment roller <NUM> which is retained in angled adjustment slot <NUM> by retention snap rings <NUM> or similar shoulder bolt and cotter pin. When the secure receiver <NUM> is fastened to a load bar extender <NUM> the set screw <NUM> can be tightened which will draw the leveling adjustment roller <NUM> upward following the path of the angled slot <NUM> and along the face of the load bar to take up tolerance between the fasteners and the fastener holes in both the secure receiver <NUM> and the load bar extender <NUM> to effectively rotate the secure receiver <NUM> to level and plumb.

<FIG> is a flowchart outlining the method of mounting the cart <NUM> to a vehicle. In step <NUM>, the cart <NUM> is rolled up to the vehicle. In step <NUM>, the mount secure coupling <NUM> is aligned directly above the secure receiver <NUM>. In step <NUM>, the mount secure coupling <NUM> is lowered onto the secure receiver <NUM> by the hydraulic cylinder pump <NUM>, linear actuator <NUM> or manually by the operator (depending on the embodiment). In step <NUM>, the undercarriage assembly <NUM> is retracted along with the wheels <NUM>, <NUM> which are stowed under the top deck assembly <NUM>. In step <NUM>, the mount secure coupling <NUM> is locked to the secure receiver <NUM>. In step <NUM>, the vehicle drives off with the cart <NUM> acting as a carrier.

<FIG> is a flowchart outlining the method of demounting the cart <NUM> from a vehicle. In step <NUM>, the secure coupling lock release lever assembly <NUM> is unlocked by the operator. In step <NUM>, the undercarriage assembly <NUM> is extended and the wheels <NUM>, <NUM> are unlocked. In step <NUM>, the mount secure coupling <NUM> is raised above the secure receiver <NUM> by the hydraulic cylinder pump <NUM>, linear actuator <NUM> or manually by the operator (again depending on the embodiment). In step <NUM>, the cart is rolled way by the operator.

Advantages of all or some the embodiments disclosed herein include the following. First, there is ease of use since the attachment of the cart <NUM> allows for secure receiver coupling and clearance without lifting for any height receiver or ground terrain. Second, there is no vehicle tailgate obstruction when not in use. Third, there is no need to fold up since the operator can simply take off and roll away and utilize away and unattached from the vehicle unlike current available rooftop or secure receiver mounted baskets or cargo boxes. Fourth, the cart <NUM> is easy to store when not in use.

Loads <NUM> carried by the cart <NUM> may include grills, coolers, tool chests, workbench, and the like and also serve in the capacity of a lift table and work surface.

The foregoing embodiments are presently by way of example only; the scope of the present invention is to be limited only by the following claims.

Various embodiments may omit, substitute, or add various procedures or components as appropriate. For instance, in alternative configurations, the methods described may be performed in an order different from that described, and/or various stages may be added, omitted, and/or combined. Also, features described with respect to certain embodiments may be combined in various other embodiments. Different aspects and elements of the embodiments may be combined in a similar manner. Also, technology evolves and, thus, many of the elements are examples that do not limit the scope of the disclosure to those specific examples.

Claim 1:
A cart and mount secure coupling and receiver system comprising:
a secure receiver (<NUM>) and a cart (<NUM>), said cart (<NUM>) including:
a top deck assembly (<NUM>) having a carrying portion, a mount secure coupling (<NUM>) and a secure coupling lock assembly (<NUM>);
an undercarriage assembly (<NUM>) capable of supporting and adjusting the height of the top deck assembly (<NUM>) so that the mount secure coupling (<NUM>) is capable of being attached to the secure receiver (<NUM>) by the engagement of both the mount secure coupling (<NUM>) and the secure coupling lock assembly (<NUM>);
characterized in that
the mount secure coupling (<NUM>) comprises at least one mount secure coupling top tine (<NUM>); in that the secure receiver (<NUM>) comprises at least one upper tine retention slot (<NUM>) capable of receiving the corresponding at least one mount secure coupling top tine (<NUM>); and in that the secure receiver (<NUM>) further comprises:
at least one lower tine reception slot (<NUM>) capable of receiving a corresponding at least one mount secure coupling lower tine (<NUM>); and
an opening (<NUM>) capable of receiving a latch bolt (<NUM>).