Abstract: Consumer wagons are provided for carrying seated children and/or household cargo. In some embodiments, the wagons have a footwell for children carried in the wagon to place/rest their feet, and the footwell is repositionable between use position lowered relative to the wagon base and a collapsed/storage position closer to the wagon base. And in some embodiments, the wagons have a pull-handle that can be moved between different positions and that is lockable in multiple of the different positions.

Abstract: A carrying device is described in which a first portion and second portion are coupled together by a third portion. The first and second portion defining a free space there between such that a user can position a portion of their body for carrying of the carrying device.

Abstract: A medical device, such as an intra-aortic balloon pump or carrier with an extendable wheel track and handle configured to be removably carried and integrated with a cart. The wheel track is configured to extend upon extension of the handle and to return to its original position upon retraction of the handle.

Abstract: A medical device, such as an intra-aortic balloon pump or carrier with an extendable wheel track and handle configured to be removably carried and integrated with a cart. The wheel track is configured to extend upon extension of the handle and to return to its original position upon retraction of the handle.

Abstract: A medical device, such as an intra-aortic balloon pump or carrier with an extendable wheel track and handle configured to be removably carried and integrated with a cart. The wheel track is configured to extend upon extension of the handle and to return to its original position upon retraction of the handle.

Abstract: A collapsible shopping cart includes a collapsible support assembly having a support frame with a vertical frame member and a horizontal frame member. The vertical support member is pivotally secured to the horizontal support member allowing the support frame to be selectively folded. A plurality of wheels are coupled to the horizontal support member. The plurality of wheels are coupled to the horizontal support member for movement between a use orientation and a storage orientation, wherein when the plurality of wheels are in the use orientation they extend from the horizontal support member in a manner permitting engagement with a horizontal support surface such that the support assembly may roll thereupon. First and second storage receptacles shaped and dimensioned for selective attachment to the support assembly are provided.

Abstract: A height adjustment device, which includes a base, which connects to a main bar of a golf cart, and a sliding block which connects to a handle of the golf cart. There are two parallel arc oriented plates formed on each side of the base, and sliding block on both sides of the location near the opening matching with the corresponding slide guide plate. Movement of the sliding block along the base of the curved guide plate adjusts the angle and position between the sliding block and base. Furthermore, the movement can adjust the angle and position of the handle and the main bar and the overall height of the device. The device is simple, suitable for different groups of people, and may adjust handle height at any time.

Abstract: A front wheel arrangement on a bicycle trailer is provided. The connecting hook is arranged to be rotated on the connecting axis that comprises a locking arrangement for locking the front wheel in an in-use position and in a rest position.

Abstract: A collapsible shopping cart includes a collapsible support assembly having a support frame with a vertical frame member and a horizontal frame member. The vertical support member is pivotally secured to the horizontal support member allowing the support frame to be selectively folded. A plurality of wheels are coupled to the horizontal support member. The plurality of wheels are coupled to the horizontal support member for movement between a use orientation and a storage orientation, wherein when the plurality of wheels are in the use orientation they extend from the horizontal support manner in a manner permitting engagement with a horizontal support surface such that the support assembly may roll thereupon. First and second storage receptacles shaped and dimensioned for selective attachment to the support assembly are provided.

Abstract: A trolley having a base section with ground engaging parts adapted to move between a collapsed condition into a deployed condition to provide a stable base for the trolley, the ground engaging parts are interconnected for synchronised movement and an upper section that connectively extends above the base section including a coupling intermediate the upper section and base section such that the upper section and base section have synchronised movement and an actuator operatively connected thereto, wherein the motion of the actuator causes the ground engaging parts to move between the collapsed and deployed condition.

Abstract: A trolley, comprising a retractable wheel assembly (31, 32) movable between stored and in-use positions. The wheel assembly comprising an assembly support; at least one wheel arm (35) operably-connected to a wheel hub, in us the wheel hub receiving a wheel; at least one control arm (36, 37) operably-connected to the wheel hub, for affecting the orientation of the wheel hub with respect to the wheel arm as the retractable wheel assembly is moved between the stored position and the in-use position; and drive means (34) connected to the assembly support and operably connected to the at least one wheel arm and the at least one control arm, for providing rotation of the at least one wheel arm and at least one control arm about a common axis between the stored position and the in-use position.

Abstract: This application discloses a number of fold flat, collapsible, stowable wheel assemblies for wheeled carriers including but not limited to strollers, jogging strollers, flat carts, dollies, trolleys, wagons and carts. The application discloses novel methods to selectively fixate the wheel/tire position, to stow and fold flat, fixed, swivel and caster wheels so that the wheels/tires fold flat and generally parallel with the floor/base/frame of the device providing for a thin stowed profile. Also, one innovation provides for a flat cart and all wheels fold flat to the underside and side elevational profile of the carrier device. Other innovations relate to methods to manufacture and provide for fold flat caster or swivel wheels. One embodiment provides for a baby jogging stroller forward wheel/tire that is a selectively fixed, or becomes a swivel wheel, which quickly and easily may be folded flat along the jogger frame, without removing the wheel.

Abstract: Disclosed is a method and device for varying the width of a wheelchair. The disclosed embodiments utilize a plurality of vertical pivots and linkages to facilitate the manipulation of a pair of horizontally oriented “scissor” linkages in order to reduce the track of the wheels for use in close quarter environments, such as commercial airlines, or to collapse the chair for transport or storage.

Abstract: A ladder assembly includes a ladder, two wheel carriers mounted on the ladder movably and rotatably, two wheels each rotatably mounted on a respective one of the wheel carriers, two fastening members each extended through a respective one of the wheel carriers and each secured on the ladder to attach the respective wheel carrier to the ladder, and a support rack pivotally mounted on the ladder. Thus, when the support rack and the wheels are expanded outward from the ladder, the ladder assembly can function as a carrier, and when the support rack and the wheels are folded onto the ladder, the ladder assembly can function as a ladder so that the ladder assembly both functions as a ladder and a carrier, thereby enhancing the versatility of the ladder assembly.

Abstract: A golf bag cart foldable device includes a bottom cart stand having a link segment. The bottom cart stand is provided with a channel, for sliding by a slider. The bottom cart stand joins a front wheel. An upper cart stand is in pinned connection with the link segment. A rear wheel frame is in pinned connection with the link segment and to a rear wheel. A linkage is connected between the slider and the upper cart stand. A strut bar is connected between the slider and the rear wheel frame. An interlocking mechanism includes a pull handle and a clamping rod having two ends lodged in the long trough. A connection member has two ends connected to the two ends of the clamping rod. A spring is joined to the clamping rod and the upper cart stand.

Abstract: A folding cart (20) includes a frame (22) having a first extendable leg and a second extendable leg. A bag support (30) connects the first extendable leg with the second extendable leg and defines a first plate (44) adjacent the first extendable leg. A second plate (46) is defined on the bag support (30) adjacent the second extendable leg. A vertical hinge (48) rotatably connects the first plate (44) with the second plate (46) such that the first plate (44) can rotate relative to the second plate (46) about a bag support (30) axis of rotation such that the cart (20) is can be folded when not in use.

Abstract: A three-dimensional folding stroller featuring movable infant carrier mounts for securing an infant carrier to the stroller. The infant carrier mounts move between a first position, where the infant carrier may be secured to the stroller, and a second position that facilitates folding. The stroller also features a reclinable seatback support that is operable by one hand.

Abstract: A transportable caddy for sports equipment provides multiple storage containers and structures for storing sports equipment in a secured frame, providing a ball rack with a release means allowing for the balls to be intentionally released into the playing arena, storage containers for clean and dirty sports gear, sports markers and hardware, refreshment containers, and other items associated with a particular sport, primarily soccer, basketball, baseball or other sport which requires the transport of bulk equipment to and from the practice or playing venues.

Abstract: The invention relates to a carrier frame for a manually movable caddie, in particular to a golf caddie comprising wheels (2) mounted on the laterally protruding parts (7, 8) of the fame. According to the invention, for folding the golf caddie, the laterally protruding parts (7, 8) of the frame are embodied pivotable and/or displaceable in such a way that they bring the wheels (2) closer to each other towards a mid-plane (18) or move them away therefrom. In a preferred embodiment, the protruding parts (7, 8) of the frame and the wheels (2) are embodied pivotable or displaceable in such a way that the axes of the brought together wheels (2) coincide and the wheels (2) are disposed oppositely to each other by the external faces thereof.

Abstract: A golf bag carrier includes a pivot adjusting unit, at least one strut pivotally coupled to the pivot adjusting unit and adjusted in an angle with respect to a ground by the pivot adjusting unit, at least one wheel coupled to a lower end of the strut to move the golf bag, a fixing plate to which the pivot adjusting unit having the strut and the wheel are fixed, a vertical bar that is fixedly installed on a central portion of the fixing plate, and a fixing unit that is installed on the golf bag to detachably fix the vertical bar on the golf bag.

Abstract: A mobility device includes at least a first front leg and at least a first rear leg connected to the first front leg connected to the first front leg. The first rear leg includes an upper member having a first end a second end and a lower member having a first end and a second end. The first end of the upper member is pivotally connected to the first end of the lower member, and the lower member is preferably pivotal between an extended use position and a folded storage position.

Abstract: The utility model involves golf cart technology, particularly related to a folding golf cart, which includes a car chassis, the main bar, push handle, folding bar. The main bar, connector, folding bar, and the car chassis together form a four-bar linkage, the connected action of the four-bar linkage moves other components involved in the action accordingly. During usage, press the button and push the push handle backward/downwards, which drives the main bar and the folding bar forward and closed, and makes the golf cart form into a Z shaped of three-panel folding state. This substantially reduces the size, saves space, and is convenient to store and transport. It is also a simple structure, easy to fold or open, and easy to operate.

Abstract: A stroller frame has a front, a back, and a ready for use configuration. The stroller frame includes a spine having a forward end, a rear end, an underside, and a top side. The spine is positioned generally along a center lengthwise axis of the stroller frame with the forward end coinciding with the front of the stroller frame and the rear end elevated above the forward end and coinciding with the back of the stroller frame. A pair of rear legs each has a proximal end coupled to the spine and a distal end located below, laterally outward, and rearward of the respective proximal end. The proximal ends are laterally spaced apart from one another. A pair of support arms each has a proximal end coupled to the spine. Each support arm has a distal end portion located above, laterally outward, and forward of the respective proximal end. A seat is frame coupled to the stroller frame and positioned on the top side of the spine. The stroller can be collapsible in three dimensions.

Abstract: A collapsible pushchair can be expanded into a deployed state for carrying a child and collapsed into a portable state for being carried as a piece of luggage. Transformation of the pushchair between its deployed and portable states is enabled by the use of rotationally mounted chair legs.

Abstract: A rollator having a variable track width that can be adjusted across a range of widths for use in operation by pivoting a pair of support members, wherein the alignment of the wheels is maintained in the direction of travel during operation across the range of track widths.

Abstract: A foldable wheel seat has a base, an operating bar, a first rotating shaft and two wheel axles. The base has a groove formed in a top face of the base. The operating bar is mounted pivotally in the groove of the base. The first rotating shaft is mounted rotatably in the base and has at least one end and two pulling segments. The at least one end of the first rotating shaft is extended into the groove of the base and is securely connected to the operating bar. The pulling segments are mounted on the first rotating shaft and each pulling segment has two pulling tabs. The wheel axles are mounted rotatably in the base and are perpendicular to the first rotating shaft and below the pulling segments of the first rotating shaft. Each wheel axle has an engaging block, at least two wheels, a holding panel and a torsional spring.

Abstract: A front wheel of a golf cart includes a supporting component, a round rotating member, and a joining shaft coupling the rotating member to the supporting component; the supporting component includes a holding part, which has an outer stopping protrusion, a polygonal portion, and a round portion adjoining the polygonal portion; the shaft includes a shank partly held in the holding part; a spring biases the shaft to such a position that the shaft is prevented from rotating by the polygonal portion; a fixing component is secured around other end of the shank, and contains the stopping protrusion; the fixing component has a polygonal hollow portion to fit closely around the polygonal portion to prevent the shaft from rotating; the round rotating member can be turned together with the shaft to fold the front wheel after the polygonal hollow portion is relocated around the round portion.

Abstract: The wheeled cart apparatus provides transport of multiple items from a vehicle to a chosen destination. The apparatus features collapsible telescopic legs of which each has a swivel wheel with wheel lock. The upper borders surround substantially the entire rectangular table top. The lower skirts provide teeth for preventing movement of the apparatus when loaded into a vehicle. The grips on the first skirt provided for lifting that side of the apparatus while the casters on the opposite skirt enable ease of apparatus movement with the first skirt lifted. The lockably hinged legs are prevented escape from the collapsed position by the c-clips and the keeper rod. Legs are spaced inwardly from the skirts to aide in apparatus support while legs are extended or collapsed.

Abstract: A detachable mobile seat includes a first part connected to a motor; a second part attached to the seat; and two links, each connected to the first part, the second part, and a wheel. The links transfer movement of the first part to the wheels. The first part includes a shaft connected to the motor, and two nuts disposed around the shaft that have screw threads in opposite directions and move along the shaft in response to operation of the motor. Each link includes a first link connected to the second part and to the nut, and a second link connected to the nut and to the wheel. The end of each second link that is nearest the wheel is rotatably connected to a connecting arm that has a rotating bar that rotates the wheel in response to operation of the links.

Abstract: A folding chair includes handle frames, and front legs and rear legs configured to support the chair in an upright position. The front legs are pivotally attached to respective rear legs. A chair portion, includes a back rest, a seat and a leg rest pivotally attached to the seat. Pivot frames are pivotally attached to respective handle frames, the back rest and the rear legs. Sliders are pivotally attached to respective pivot frames, the back rest, respective arm rests and the seat and are configured to slide along the front legs.

Abstract: Apparatus and methods for propelling a multiple-wheeled golf bag cart over a terrain are described. In one embodiment, the apparatus is configured to be attached to a handle of the golf bag cart and further configured to be attached to the waist of a golfer. The apparatus includes a belt member for attachment to the waist of the golfer, a deformable member configured to be disposed between the cart handle and the belt member for controlling movement of the cart while the cart is being towed, and a mounting member for attachment to the handle for connecting the deformable member to the handle.

Abstract: The present invention discloses a golf bag structure. The main body of the structure includes a bag portion, a pulling portion and a receiving portion, wherein the pulling portion is provided on the side of the bag portion and the pulling portion includes a handle, a pulling lever and at least one wheel. The handle is assembled with the pulling lever. The wheel is provided at one end of the pulling lever and can be detached therefrom. Additionally, the receiving portion is provided at one end of the bag portion and can receive the detached wheel, thereby reducing the size of the main body.

Abstract: A movable rack for supporting articles. In a preferred embodiment, the rack comprises a frame which supports first and second shelf groups. The second shelf group can be added to the rack when additional shelf space is required and can be removed when additional shelf space is not needed or when the rack is to be moved through or stored in places with limited floor space. Wheel supports and wheels are secured with respect to the frame permitting the rack to be moved. The wheel supports are extensible outward from the frame thereby improving rack stability, particularly when one or more of the second group shelves are attached or when it is desired to move the rack.

Abstract: A convertible dual stroller and methods therefor is provided for seating at least two children side-by-side when fully expanded, a single child when partially expanded and partially collapsed, and which is fully collapsible for storage. A secondary stroller portion is fixedly secured with a primary stroller portion and the secondary stroller portion may be collapsed when the convertible dual stroller is partially expanded and partially collapsed to seat one child while the primary stroller portion supports and transports the secondary stroller portion while the secondary stroller portion is collapsed.

Abstract: A golf cart includes an upper frame provided with a handlebar and a rotation articulation, a lower frame provided with an upper support seat and a lower support seat to support a golf bag for receiving golf clubs, and a link connected between the upper frame and the lower frame so that the upper frame and the lower frame are not located at the same line. Thus, the link connects the upper frame and the lower frame so that the rotation articulation on a lower end of the upper frame is not located at a central line of the lower frame and is deflected backward and upward to a rear side of an upper end of the lower frame, and a larger space is defined between the handlebar and a club head of each of the golf clubs.

Abstract: The hand truck or dolly of the present invention is capable of multi-directional movement and provides an operator with complete control of movement and directional choice for the hand truck without having to remove his hands from a handgrip location to achieve mechanical adjustments of the wheels. Rather, an operator may adjust a wheel index position on-the-fly by means of a trigger assembly to rotate a wheel assembly about a vertical axis of rotation within a range of motion of approximately 100 degrees. The two, independent wheel assemblies of the hand truck of the present invention achieve multi-directional movement through positioning of the wheels in a standard index position allowing for forward and backward movement, a lateral index position allowing for lateral, or side to side, movement, or a rotational index position allowing for rotational movement, such as for cornering and circular movement.

Abstract: A wheel assembly and a method of using the wheel assembly are provided. The wheel assembly is attachable to various objects and capable of quickly and easily collapsing or folding to become more compact for more efficient and cost-effective transportation or shipping. It is then capable of being quickly and easily expanded.

Abstract: A foldable handcart can be carried about on its wheels after being folded. The handcart has a handle structure. The lower ends of the handle structure are pivotally coupled to a frame. The frame is formed of a pair of tubes. The lower ends of the tubes are pivotally coupled to a block board. The block board can be rotated upward to contact the frame. The lower ends of the tubes are respectively sleeved by a toothed ring which engages with the teeth on the top of a sleeving tube of a wheel seat. The other side of the wheel seat is pivotally coupled to a wheel. When the block board is rotated upward, the back wall of the block board is still apart from the ground by an appropriate distance, and the wheels can thus contact the ground. Thereby, the handcart can be easily carried about on its wheels.

Abstract: A foldable handcart can be carried about on its wheels after being folded. The handcart has a handle structure. The lower ends of the handle structure are pivotally coupled to a frame. The frame is formed of a pair of tubes. The lower ends of the tubes are pivotally coupled to a block board. The block board can be rotated upward to contact the frame. The lower ends of the tubes are respectively sleeved by a toothed ring which engages with the teeth on the top of a sleeving tube of a wheel seat. The other side of the wheel seat is pivotally coupled to a wheel. When the block board is rotated upward, the back wall of the block board is still apart from the ground by an appropriate distance, and the wheels can thus contact the ground. Thereby, the handcart can be easily carried about on its wheels.

Abstract: A collapsible golf trolley comprises a frame (176, 276) defined by at least two, preferably four, frame members (171, 172, 173, 174, 203), and a wheel structure (122, 222). The frame members are pivotally interconnected at hinges (106;177, 205), whereby in a first configuration, the frame members define a casing (100, 200) for the wheel structure parts, the casing having a length which is shorter than the sum of the lengths of each of the frame members. In a second configuration, the frame members coextend in a longitudinal direction to define the frame (176, 276). There is further provided a collapsible wheel structure having arms (150, 152, 258, 252) defining pivotally interconnected arm sections (154, 156, 158, 160;254, 256, 258, 260) which, in a first, folded configuration define a partial cylindrical shape, and which in a second, unfolded configuration form an S-shape.

Abstract: Apparatus and methods for propelling a multiple-wheeled golf bag cart over a terrain are described. In one embodiment, the apparatus is configured to be attached to a handle of the golf bag cart and further configured to be attached to the waist of a golfer. The apparatus includes a belt member for attachment to the waist of the golfer, a deformable member configured to be disposed between the cart handle and the belt member for controlling movement of the cart while the cart is being towed, and a mounting member for attachment to the handle for connecting the deformable member to the handle.

Abstract: A dolly has a carrying frame (1) provided with a scoop (2) which is coupled to an end of said frame in such a way that it can pivot about a pivoting axis (3). The scoop is movably coupled, by a control mechanism, to two wheel carriers which can be respectively pivoted about a bearing axis extending transversally in relation to the pivoting axis (3) of the scoop and which carry running wheels (4), in such a way that when the scoop is pivoted, the wheel carriers pivot out of a storage position oriented parallel to the carrying frame (1), into a use position which is perpendicular to the frame and in which the wheel carriers are oriented parallel to each other. The dolly is provided with an actuating handle (6) which can be pivoted about an axis parallel to the scoop axis (3) and which is movably coupled to the scoop (2) by a connecting rod (7).

Abstract: The invention provides a device for carrying a golf bag, comprising a frame with a frame bar extending in longitudinal direction along the golf bag, supporting elements attached to the frame or forming an integral part thereof for directly supporting the bag, and detachable fixing means for fixing the golf bag in position against at least a part of said supporting elements, wherein the supporting elements are interconnected by means of a subframe extending outside the golf bag, with the subframe being connected to the frame bar of the frame by means of manually detachable connecting means. The invention furthermore relates to a method for manufacturing such a device.

Abstract: A foldable frame includes spaced-apart first and second support rods, a first bar having a first end connected pivotally to the first support rod, a second bar having first and second ends connected pivotally and respectively to the second support rod and a second end of the first bar, a sleeve disposed slidably around the first bar and movable to a juncture of the first and second bars when the bars are unfolded so as to limit relative movement between the first and second bars, and a control unit having a cable connected to the sleeve for pulling the sleeve away from the juncture of the first and second bars so that the first and second bars can be folded.

Abstract: A casing (32) included in a baby carriage folding mechanism is mounted on a substantially middle part of the handle of a folding baby carriage. Hinged joints (33) each having a stationary member (34) and a movable member (35) are connected to the opposite ends of the casing (32), and pipes (18) forming the handle are connected to the hinged joints (33), respectively. The pipes (18) are connected to the movable members (35) of the joints (33). Actuating members (38a and 38b) capable of being operated by an operating mechanism included in the casing (32) are connected to the movable members (35) of the hinged joints (33). The actuating members (38a and 38b) turn the movable members (35) relative to the corresponding stationary members (34) for folding and developing the folding baby carriage.

Abstract: A golf bag having its own wheels for transportation and support is disclosed. The wheels are attached to the back end of the bag by a wheel carrying structure that readily folds for easy carrying and storing, and extends outwardly together with the wheels for transporting the bag and its contents. The structure also serves as a bag stand, thus avoiding the need for separate bag supports. The structure may also be easily separated from the bag and used for other purposes. The bag and the wheel structure are simple in design and inexpensive to manufacture.

Abstract: By providing a frame assembly, two wheel holding carriers which are arcuately pivotably mounted to the frame assembly, and a support platform which is also pivotally mounted to the frame assembly and controls the movement of the wheel holding carrier, a small, compact, two wheeled, luggage cart/carrier is achieved which is capable of quickly and easily arcuately pivoting wheel support brackets between two alternate positions, with ease and convenience. In addition, the arcuate pivoting movement of the wheel supporting brackets is automatically achieved simultaneously with movement of the luggage support platform from a stowed position to a deployed, usable position. The support platform is pivotally mounted to the terminating end of the frame assembly for being arcuately pivoted between a first, stowed position and a second, deployed position wherein the support platform is substantially perpendicular to the plane established by the frame assembly.

Abstract: A trolley structure allowing synchronous retraction or extension of a stand and two wheels includes a main frame, wheel bases, retainers, a stand, and a handlebar; each wheel base inserted onto a respective rod of the main frame and fixed with the respective retainer; the stand pivoted to the retainers; the handlebar inserted into retractable holders of the main frame; a plurality of troughs provided at the bottom of each wheel base; a driven gear pivoted to the outer edge of each retainer; a plurality of checking members provided on the driven gear to be held in the troughs for driving the driven gear to rotate; and an active gear provided on a first pivoting holder of the stand to mesh with the driven gear to drive the driven gear to turn.

Abstract: A multi-purpose, collapsible portable cart, for use in camping, hunting and other outdoors activities carries medical rescue carts, canoes, small boats, game, or hauled cargo by hand. The portable cart can be converted to a various uses and the portable cart can be folded down and transported within a backpack, hand carried bag, canoe or boat. It transports injured persons or cargo over long, rough terrain and it can broken down into a carrying position, by hand or by back. Its width can be varied to accommodate cargo of varying widths. Two or four wheeled versions can be assembled with axles and wheels. The cart has optional removable clamps for clamping a conventional transportable carrier, such as a stretcher or stokes-type rescue carrier bed, thereto. The objects being carried can be held by clamps, by fasteners, or through the use of insertions with longitudinally extending channels. An optional pivotable kickstand and/or tie rods can stabilize the cart in a position of rest.

Abstract: A foldable golf-bag transporting golf-bag/golf-cart assembly shaped to accommodate golf-bag with protruding storage compartments, providing for secure, reversible mounting of bag onto cart allowing bag to maintain a stable, vertical position when cart at rest, without need for straps or biasing members; having first and second mounting members shaped to reversibly mate in sliding dovetail manner attached to upper regions of bag and cart and having third and fourth mounting members shaped to reversibly mate with each other attached to lower regions of bag and cart. Mounting members available as retrofit members. Cart includes foldable handle and foldable platform attached to lower end of cart that when opened to horizontal position supports bag in vertical position. Cart's wheel axle may be telescoped outwardly providing stability while assembly in motion or in vertical rest position, or may be retracted inwardly to provide for transport through narrow passageways.