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 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.