Patent ID: 6367602
Filing Date: 2002-04-09
Classification: A45C

Abstract:
A retractable wheel for a built-in luggage cart which has a pair of telescopic pull rods (14), a handle (16) connected to upper, ends of the pull rods (14), wherein the retractable wheels are mounted at opposite sides of the lower edge of the luggage (10) near the lower ends of the pull rods (14), wherein each retractable wheel comprises:a frame (20) that is adapted for attaching to a lower edge of the luggage (10) and having a wheel well (21) defined therein and shaped according to a wheel mount (30) and a wheel (32) which are retractable into and extendable from the wheel well (21); the wheel mount (30) having an upper end thereof pivotally connected to the frame (20), and the wheel (32) rotatably connected to the lower end of the wheel mount (30); a strut (22) having an upright rod (222) extending through an hole (202) defined in the top wall of the frame (20), and an inverted U-shaped member (226) formed at the lower end of the rod (222); a pair of arms (23) with one end of each arm (23) pivotally connected to a lower end of one of the legs of the inverted U-shaped member (226) of the strut (22), and the other end of each arm (23) pivotally connected to one side of opposite sides of the wheel mount (30); a cross tube (40) having, opposite end, respectively extending through the lower ends of the corresponding pull rods (14); a connecting rod (42) having opposite ends respectively connected to the upper end of the rod (222) of the strut (22) and the cross tube (40); whereby when the telescopic pull rod (14) is extended, the strut (22) is lifted to an upper position, the arms (23) are forced to extend in a substantially horizontal direction to move the wheel mount (30) pivotally out of the wheel well (21) of the frame (20); when the telescopic pull rod (14) is retracted, the strut (22) is pressed to a lower position, the arms (23) are forced to extend in a substantially vertical direction to pull the wheel mount (30) pivotally retracted into the wheel well (21) of the frame (20).