Abstract: A hand trolley includes a trolley main body and a handle assembly. The handle assembly includes a handle, a fastener, and an elastic member. The handle is displaced relative to the trolley main body between a folded position and an unfolded position. The fastener is pivotally connected to the handle. The elastic member is connected with the handle and the fastener to provide an elastic force for the fastener to be located at a predetermined fastening position. When the handle is displaced relative to the trolley main body toward the unfolded position, the fastener is pivoted to engage with an engaging portion of the trolley main body.

Abstract: A folding structure for a trolley includes at least two main poles and a movable member. The main poles are connected to a carrying platform having an operating rod, two roller sets, and a base that are motionally linked. A transverse plate is attached to upper ends of the main poles. The movable member is slidably mounted on the main poles and has a pull rod. The pull rod extends beyond the transverse plate for an extension distance. To prepare the trolley for use, the operating rod is pushed downward so that the roller sets expand in a horizontal direction and the base is laid down. Then the pull rod is set for its largest extension distance to facilitate a user's pulling trolley. After use, the trolley can be easily folded by lifting the operating rod that in turn drives the roller sets and the base to retract.

Abstract: A carrier unit for carrying boxes includes at least one carrier having multiple holes defined therethrough and two first engaging portions are provided on two insides of each of the holes. Multiple parts boxes are engaged with the holes and each box has a body and a cover which is pivotably connected to the body. The body has two second engaging portions which can be engaged with the first engaging portions when the body is installed in one of the holes. The cover has two protruded portions which contact the carrier when the cover is opened so that the second engaging portions can be disengaged from the first engaging portions.

Abstract: A foam wheel assembling and positioning structure includes a wheel frame having a plurality of ribbed plates thereon and a wheel body covering the ribbed plates. The wheel body has a penetration hole. A first fixing part is formed on a peripheral edge of the penetration hole and provided with a plurality of first fixing holes thereon. Two wheel covers are fixed oppositely on the wheel frame. Each wheel cover has a positioning hole thereon, and a positioning screw penetrates into the positioning hole and is screw-locked with a positioning nut. Furthermore, a peripheral edge of each wheel cover has a second fixing part which has second fixing holes thereon. A fixing element is fixed in the first and second fixing hole, so as to fix the wheel body onto the wheel frame and the wheel covers, thereby avoiding detachment caused by relative sliding during traveling.

Abstract: A locating structure of a handcart includes a main frame, two side rods and a locating rod. The main frame includes a pair of longitudinal rods. The two side rods are pivotally connected to the longitudinal rods of the main frames, respectively. Each side rod has a stop section which is spaced from the longitudinal rod. The locating rod is pivotally connected to the main frame. The locating rod has a pair of extension sections to engage with the stop sections of the two side rods when the two side rods and the locating rod are unfolded.

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 push cart comprises a main frame, a handle, a front support, two wheel frames, two wheels, a retractable rod and a rear support, wherein the main frame has a pair of side rods connected with a pair of rods of the handle in a slidable manner, the center portion of the main frame is connected to each other, and the lower portion of the main frame has connected with a wheel frame and a wheel respectively. The lower respective ends of the main frame are connected with respective ends of the front support which then meshes with the wheel frame. The respective lower ends of the handle are connected with one end of the retractable rod whereas the other end of the retractable rod is connected with the inner center portion of the front support, thus, by operating the handle, the retractable rod is linked to move which then links the front support and the wheel frame to retract or to expand.

Abstract: A collapsible luggage cart comprising an inverted U-shaped handle combined with a horizontal eccentric tube with pivotal discs, a vertical middle support tube and two vertical side support tubes combined pivotally with and under the eccentric tube with both a middle pivotal ring and two side pivotal rings so as to make the handle swingable upward for spreading and downward for collapsing, a luggage frame combined pivotally with the lower ends of the middle and the two side vertical tubes so as to make the luggage frame swingable down for spreading for use or up for collapsing, and two wheels combined with two wheel frames combined pivotally with the two vertical side support tubes so as to make the wheel frames swingable outward for spreading and inward for collapsing.

Abstract: A push cart comprises includes a main frame, a handle, a front support, two wheel frames, two wheels, and a retractable rod and a rear support , wherein the main frame has a pair of side rods connected with a pair of rods of the handle in a slidable manner, the center portion of the main frame is connected to each other, and the lower portion of the main frame has is connected with a the wheel frame frames and a wheel respectively the wheels. The lower respective ends portion of the main frame are is connected with respective ends sides of the front support which then meshes with the wheel frame frames. The respective lower ends of the handle are connected with one end of the retractable rod whereas the other end of the retractable rod is connected with the inner center portion of the front support, thus, support. Thus, by operating the handle, the retractable rod is linked to move which then links the front support and the wheel frame to retract or to expand.