A track dolly to mount a camera and accessories thereon is provided. The track dolly includes a steering mechanism to enhance directional control of the dolly when in motion. The track dolly includes a plate, at least one rail coupled to the plate and designed to permit attachment of the camera or accessories thereto, a plurality of wheels rotatably mounted to the plate, a handle rotatably mounted to the plate, and a plurality of linkage members adjustably mounted to the bottom surface of the plate and operably connected to the handle. The linkage members are operably connected to any number of the plurality of wheels. The handle is maneuvered to permit the plurality of linkage members to rotatably adjust any number of the plurality of wheels relative to the plate, thereby adjusting the directional control of the dolly.

There is provided a pram frame (200) comprising a first roller attachment point (221) configured to engage with a first roller set (121) and a mechanism (231) configured to engage with the first roller set (121) via the first roller attachment point (221). The mechanism (231) is configured to provide driven steering of the first roller set (121) when a user steers the pram frame (200).

A mobile body that is human-powered includes three all-directional wheels with axles thereof displaced from each other by 120 degrees, a connection portion that connects two front wheels, a brake attached to a rear wheel, and a disconnection portion that disconnects the two front wheels from each other. The connection portion connects the two front wheels such that the two front wheels rotate in directions opposite to each other. The connection portion connects the front wheels with the rear wheel such that the two front wheels rotate in the same direction, while the front wheels rotate in a direction opposite to a rotational direction of the rear wheel.

Certain exemplary embodiments can provide a dolly comprising a frame, a set of guide rollers, a planetary disc, a set of rollers, and a caster. The frame comprises a plurality of cells. The set of guide rollers is coupled to the frame. The planetary disc constrained within a cell of the plurality of cells via the guide rollers. The set of rollers is coupled to the cell of the plurality of cells. Each of the plurality of rollers contacts a surface of the planetary disc. The set of rollers is constructed to distribute a load placed on the dolly over a surface of the planetary disc, thereby reducing a probability of failure of the dolly. The caster is coupled to the planetary disc.

Bidirectional trolley (1) comprising a movable drawbar (2), a push handle (3), a loading and unloading plan (5), two front wheels (4, 4′) and two rear wheels (40, 40′) connected to the loading and unloading plan (5). A handling system (10) comprising in turn a first toothed means (8) connected by meshing to the front wheel (4), and a second toothed means (80) connected, again by meshing, to the rear wheel (40), in which the first toothed means (8) and the second toothed means (80) are connected to each other by a connecting bar (9) which allows the joint movement of the two toothed means (8, 80) as a result of the movement of the drawbar (2) by means of the push handle (3) by the user.

Bidirectional trolley (1) comprising a movable drawbar (2), a push handle (3), a loading and unloading plan (5), two front wheels (4, 4′) and two rear wheels (40, 40′) connected to the loading and unloading plan (5). A handling system (10) comprising in turn a first toothed means (8) connected by meshing to the front wheel (4), and a second toothed means (80) connected, again by meshing, to the rear wheel (40), in which the first toothed means (8) and the second toothed means (80) are connected to each other by a connecting bar (9) which allows the joint movement of the two toothed means (8, 80) as a result of the movement of the drawbar (2) by means of the push handle (3) by the user.

A method for steering the wheel assemblies of a gantry crane, including the steps of beginning the steering of at least one wheel assembly in the desired direction; and setting the angular position of a moveable pointer indicating a theoretical position of the wheel assembly which is consistent with said desired direction. The following steps are also included: setting an increment value of the moveable pointer in a direction consistent with respect to the steering movement of the wheel assembly; calculating the angular difference between the angular position of the moveable pointer and the current position of the wheel assembly; andincreasing the increment value of the moveable pointer if the difference shows a decrease, or decreasing the increment value of the moveable pointer if the difference shows an increase.

A laterally collapsible, user-pushed, four-wheeled rollator, stroller or the like has swiveling front wheels for steering, each mounted in a fork with a vertical post, with a toothed pulley fixed thereto, rotatable in a bearing housing fixed at the front end of right and left side frames. The two swiveling front wheels can swivel to any steering angle but always in unison with each other by virtue of a flexible toothed synchronous belt extending between the toothed pulleys. The interior of each bearing housing closely surrounds each toothed pulley and the belt, preventing any disengagement of the belt from either toothed pulley even when the belt becomes slack when the left and right side frames are folded towards each other. A synchronous chain with sprockets can also be used. Tether means pull the belt/chain rearwardly to a protected position during folding.

A selectively extendable length trolley for supporting and conveying various sized and configured containers for pieces or components in an industrial plant. The trolley includes an adjustable length trolley structure, front and rear adjustable frames and locating supports for the containers that include side supports adjustable in position in a transverse direction, orthogonal to the longitudinal direction (L). A steering control unit (2) of the trolley (1) is articulated to the front frame (32) and operates in such a way that the front wheel unit and the rear wheel unit are made to oscillate in opposite directions to keep the wheels aligned with the curved path to be followed. In a preferred embodiment, the front and rear adjustable frames are T-shaped providing an open or free space at the two sides of the central structure of the trolley.

A caster adapter is used for adapting a plurality of caster wheels onto a hand truck of the type having a backing frame extending longitudinally between a handle portion at a top end and a toe plate at a bottom end. The adapter includes a frame assembly mounting the caster wheel assemblies thereon for rolling movement along a ground surface. A pair of pivot couplings on the frame assembly pivotally couple the frame assembly on the backing frame of the hand truck for pivotal movement about a tilt axis which is parallel to the toe plate and proximate to the bottom end of the backing frame.