Transport trolley

Abstract

A luggage trolley comprises a dragging bracket, a retractable drawbar, and at least a wheel set on the bottom of the dragging bracket. On the dragging bracket there is a wheel-moving assembly that can be opened to the forward dragging direction and form a supporting point. The luggage trolley can be very smooth and stable when dragged because it can form a stable structure having three supporting points including the two wheels and a newly-added wheel of the moving wheel-assembly. The newly-added wheel is the pivot which bears the most weight of the luggage when the luggage inclines. It becomes the bearing support and greatly improves the mobility of the trolley when dragged and the stability of the trolley when standing.

1 . A luggage trolley comprising a dragging bracket, a retractable drawbar, and at least a wheel on the bottom of the dragging bracket, wherein, on the dragging bracket there is a wheel-moving assembly that can be opened to a forward dragging direction and form a supporting point. 
   
   
       2 . A luggage trolley as claimed in  claim 1 , wherein the wheel-moving assembly comprises a wheel shaft and a moving wheel, one end of the wheel-moving assembly being pivotally connected to the dragging bracket and can be opened to the forward dragging direction while the other end of the wheel-moving assembly is mounted with the moving wheel. 
   
   
       3 . A luggage trolley as claimed in  claim 1 , wherein on the dragging bracket there is a fixing assembly to fix an opening angle of the wheel-moving assembly. 
   
   
       4 . A luggage trolley as claimed in  claim 3 , wherein the fixing assembly comprises a sliding sleeve and two connecting rods, the sliding sleeve is mounted on the wheel-moving assembly and the two ends of each connecting rod respectively are pivotally connected to the sliding sleeve and the dragging bracket and can be rotated. 
   
   
       5 . A luggage trolley as claimed in  claim 3 , wherein on the wheel-moving assembly there is a location device to fix the relative position between the fixing assembly and the wheel-moving assembly. 
   
   
       6 . A luggage trolley as claimed in  claim 5 , wherein the location device is a biased projection on the wheel-moving assembly. 
   
   
       7 . A luggage trolley as claimed in  claim 1 , wherein on the dragging bracket there is an opening-control device to open or pack up the wheel-moving assembly, and the opening-control device comprises: a rotating transverse axle radially connected to the wheel-moving assembly, wherein a block is positioned on the rotating transverse axle or the wheel-moving assembly, and a push key on the retractable drawbar can be used to drive the block and open the wheel-moving assembly when being pushed. 
   
   
       8 . A luggage trolley as claimed in  claim 7 , wherein the block transversely extends to connect the two ends of the rotating transverse axle; and the retractable drawbar has two bars while at the bottom of the retractable drawbar a projecting push device is positioned relative to the block. 
   
   
       9 . A luggage trolley as claimed in  claim 8 , wherein the rotating transverse axle is eccentric and the block is positioned on a far end. 
   
   
       10 . A luggage trolley as claimed in  claim 9 , wherein a restorable spring is positioned on the other side of the block opposite to the push key. 
   
   
       11 . A luggage trolley as claimed in  claim 7 , wherein the block is set on an inner side of the wheel-moving assembly; and the retractable drawbar is a single bar while at the bottom of the retractable drawbar a projecting push device is positioned relative to the block, with a bevel forming an engaging interface between the block and the projecting push device. 
   
   
       12 . A luggage trolley as claimed in  claim 11 , wherein on the opposite side of the rotating transverse axle to the wheel-moving assembly there is a projection with a restorable spring. 
   
   
       13 . A luggage trolley as claimed in  claim 7 , wherein the wheel-moving assembly comprises a wheel shaft and in the wheel shaft a safety device is mounted. 
   
   
       14 . A luggage trolley as claimed in  claim 13 , wherein the safety device comprises a retractable lockpin radially protruding out of the wheel shaft, and a lock pole mounted inside the wheel shaft to control the lockpin by longitudinally moving. 
   
   
       15 . A luggage trolley as claimed in  claim 14 , wherein a bottom of the retractable lockpin has an X-type spring loaded device and the relative end of the lock pole is an inverse V-type structure while the two arms of the X-type spring loaded device slide against the inverse V-type structure. 
   
   
       16 . A luggage trolley as claimed in  claim 7 , wherein at corresponding positions of the dragging bracket and the retractable drawbar there are anchor points to fit to each other when being mounted. 
   
   
       17 . A luggage trolley as claimed in  claim 8 , wherein a stop device is positioned on the bottom end of the retractable drawbar and under the push device, and a talus is correspondingly positioned on a connecting end of one of the connecting rods to the dragging bracket to engage the stop device and stop the connecting rods from opening.