| 摘要 |
A folding hand truck auxiliary wheel structure comprising an U-shaped auxiliary wheel frame adjustably secured to the wheel frame of a folding hand truck by a stop plate and a U-shaped spring wire to hold a pair of auxiliary wheels, wherein the U-shaped auxiliary wheel frame has a plurality of pairs of pin holes symmetrically made on the two linked, elongated rods thereof along longitudinal direction; the stop plate has two curved portions spaced from each other for fastening the two linked, elongated rods of the U-shaped auxiliary wheel frame which have each a pin hole at an inner side. The auxiliary wheels are extended out and fixedly set at a level below the wheels on the wheel frame of the folding hand truck to which the auxiliary wheel structure is attached when the two opposite ends of the U-shaped spring wire are respectively fastened through the pin holes on the stop plate into the first pair of pin holes on the U-shaped auxiliary wheel frame, or received back into an idle position when the two opposite ends of the U-shaped spring wire are fastened into the last pair of pin holes on the U-shaped auxiliary wheel frame.
|
