WHEELED APPARATUS HAVING MULTIPLE WHEELBASE CONFIGURATIONS
摘要
<p>A wheeled apparatus has a pair of first-size wheels attached in a spaced apart arrangement to amain frame at its first end portion. A subframe is moveably attached at its first end portion to the main frame at a position between the first-size wheels and a second end portion of the main frame. The subframe is attached to the main frame for allowing the subframe to be freely moved between a first position and a second position. The subframe and the main frame jointly limit movement of the subframe to be between the first and second positions. A pair of second-size wheel is attached to a second end portion of the subframe. The first-size and second-size wheels jointly provide a first wheelbase length when the subframe is in the first position and jointly provide a second wheelbase length when the subframe is in the second position.</p>
