Patent attributes
A tubular frame has leading and trailing sections. The leading section has a leading end with parallel rearwardly extending legs. The trailing section has a trailing end with parallel forwardly extending legs receiving the rearwardly extending legs. An axle has central and end sections with wheels rotatably mounted on the end sections. A riser plate has a lower edge pivotably coupled to the axle. The riser plate has an upper edge with a concave curve. The riser plate is pivotably coupled to the frame. A handle assembly has a tubular grip with parallel downwardly extending arms. The handle assembly also has parallel upwardly extending arms receiving the downwardly extending arms. The upwardly extending arms are pivotably coupled to the axle.
