Student invents no-spill tray for walkers

A senior at Colorado University studying mechanical engineering on the Boulder campus, has partnered with his classmates to design and build an accessory tray for walkers, which incorporates a stabilizing device that consists of four polypropylene rails along with ball bearings. The device allows the tray to remain level while its user goes up and down ramps, or tilts from side to side. The accessory tray, which has gone through tests, also sustains low-speed impacts.