主权项 |
1. A cart, comprising:
a frame defining a frame bed; two wheels attached to the frame and selectively interchangeable between first and second wheel positions, each of said two wheels having a wheel axle, wherein in the first wheel position the wheels are mounted to the frame such that the wheel axle of the first wheel is substantially axially aligned with the wheel axle of the second wheel, and in the second wheel position the wheel axle of the first wheel is parallel to and spaced apart from the wheel axle of the second wheel. |