| 摘要 |
<p>Methods and wheel assemblies for supporting a bag (20) that is tilted and pulled along a surface. A wheel housing (40), a strut member (42), a spring member (46), and a wheel member (44) are provided. The wheel housing (40) is rigidly attached to a bottom edge of the bag. The strut member (42) is mounted within the housing for movement between first and second positions. The spring member (46) is arranged between the wheel housing (40) and the strut member (42) to oppose movement of the strut member (42) from the first position to the second position. The wheel member (44) is rotatably attached to the strut member (42) such that at least a portion of the wheel member (44) extends out of the wheel housing (40) as the strut member (42) moves between the first and second positions. The wheel member (44) engages the surface and rotates to allow the bag (20) to roll along the surface when the bag is tilted and pulled. The strut member (42) is substantially vertically aligned when the bag (20) is tilted and pulled and when the strut member (42) moves between the first and second positions. First and second wheel members (40) can be attached to the bag (20) for improved stability.</p> |
