| US 7,500,680 B2 | ||
| Suspensions for wheeled transport devices | ||
| Douglas C. Dayton, Lexington, Mass. (US); and Florian Altmann, Cambridge, Mass. (US) | ||
| Assigned to Umagination Labs, L.P., Newton, Mass. (US) | ||
| Filed on Jul. 20, 2005, as Appl. No. 11/185,316. | ||
| Claims priority of provisional application 60/599510, filed on Aug. 06, 2004. | ||
| Prior Publication US 2006/0038366 A1, Feb. 23, 2006 | ||
| Int. Cl. B62D 21/11 (2006.01) | ||
| U.S. Cl. 280—37 [280/654; 280/655; 280/655.1; 280/47.17; 280/19.1; 280/47.26; 280/19.3] | 42 Claims |
| 1. A wheeled transport device configured to be manually wheeled in an inclined position by a pedestrian user, the transport
device comprising:
a main body defining a compartment therein for containing goods to be transported;
a handle disposed at an upper end of the body when the transport device is in an operative, inclined position, the handle
manually graspable by the pedestrian user while walking; and
at least two wheels disposed at a lower end of the body when the transport device is in an operative, inclined position, each
of the two wheels secured to the body by respective suspensions for independent rotation along a surface upon which the user
is walking;
wherein each suspension is geometrically configured to toe its respective wheel with respect to the main body to alter a rolling
direction of the respective wheel and counter a tendency of the wheeled transport device to rotate about its axis of inclination
in response to forces applied to the respective wheel by the surface in a direction opposing wheel motion.
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