| 主权项 |
1. A foldable luggage carrier, comprising:
a frame having an upper handle portion and a pair of lower leg portions configured to provide support for an article in a first plane; a supporting tray having a pair of pivot brackets and two pivot pins; the pivot brackets receiving the pivot pins which transversely extending through lower ends of the leg portions of the frame such that the tray is pivotable between a forwardly extended position where the tray is disposed substantially orthogonally to the first plane, and a fold-up position where the tray is disposed substantially parallel with the first plane; wherein each of the pivot brackets includes a pair of opposed plates and at least one cam portion projecting from a corner of one of the plates; and a pair of transversely spaced-apart wheeled carriages each having a wheel bracket and a wheel; each wheel bracket having two opposed projecting arms to embrace the wheel, and a sleeve bearing rotatably supported on each leg portion of the frame to permit the wheeled carriages to pivot between rearwardly extended positions where axes of rotation of the wheels are in parallel relation to the first plane, and folded-in positions where the axes of rotation of the wheels are disposed orthogonally to the first plane; wherein the sleeve bearing is formed at an annular bottom surface with a guiding slope section and a generally flat section which together define an obtuse angle therebetween; wherein when the tray is disposed in the forwardly extended position, the cam portion of each pivot bracket is rested with one side in between the guiding slope section and the flat section of the respective sleeve bearing; and while the tray is moved from the forwardly extended position to the fold-up position, the cam portion swings about the pivot pin and bears against the guiding slope section of the sleeve bearing, resulting in each wheeled carriage pivoting from the rearwardly extended position to the folded-in position. |
