• Lee Knight, a senior in mechanical engineering, pulls Professor David Wallace and a plant in the Green Wagon, which transports items and then converts to a bench on which to sit in the garden and work.

    Photo / Donna Coveney

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  • Mechanical engineering senior Aimee Angel demonstrates Power-Up, designed to assist people who have difficulty getting up from chairs.

    Photo / Donna Coveney

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Student teams demonstrate prototypes of devices for elderly

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Plenty of people are bitten by the gardening bug this time of year, but how many of them would purchase a Garden Bug machine to help with the work? That's a question a team of student inventors sought to answer when they took their battery-powered device to the National Museum of American History last month for a special exhibit.

They, along with two other teams from 2.009 (The Product Engineering Process), demonstrated their invention prototypes in front of the hundreds of visitors streaming through the national museum in Washington, DC that day.

"A lot of people said they'd be willing to buy it for $200 to $250," said Roger Chang, a senior in mechanical engineering, who thinks the Garden Bug could be built and sold for $150.

He and his teammates describe the machine as "a cart-like device that can be used to comfortably lower an elderly person to a kneeling position and then raise [him or her] back to the standing position. It was designed to be lightweight, easily stored, but sufficiently robust to insure user confidence." The prototype works for a person up to 200 pounds and 6 feet 4 inches tall.

But selling or even marketing isn't the point of 2.009. Coming up with an invention that has marketing potential, and designing and building the alpha prototype, are the goals of the senior-level course, the third in a triad of design and manufacturing courses required for mechanical engineering majors. (The sophomore-level 2.007, which culminates in an annual robot contest that will be held this year on May 9, is the best known of the three; 2.008, the junior-year course, focuses on manufacturing processes.)

Each of the 2.009 team's projects costs about $6,000 to build. Sponsors for the course are the Lemelson Foundation (which also sponsors the Lemelson-MIT Program), United Technologies and General Motors Corp.

This year's 2.009 theme was to design electromechanical devices for the active elderly population, said Professor David Wallace, lead instructor for the course. Students were divided into six 19-person teams. Each team had to prepare three ideas to present to a "governing board," consisting of Professor Wallace and the other course instructors -- Professors David Cochran, Woodie Flowers, David Gossard and Igor Paul, and instructors Hamid Hashemi and David Meeker -- who then chose a more focused product theme for each group to pursue.

"After the three-idea presentation, our morale was pretty low," said Mr. Chang, whose team's three ideas were all thrown out. They had spent nearly two months brainstorming and doing marketing research on a garden wheelchair, a climate-controlled wheelchair and a snowmobile for the elderly. "In retrospect, I guess the ideas weren't very good."

In a two-hour emergency session the next day, the team generated the idea that became the Garden Bug. The idea passed the board's scrutiny and the team was off and running to design and build the device in the remaining few weeks of the course.


The course teaches the "process, engineering design tools and methods, and types of team management" necessary for product design, said Professor Wallace. "It's an incredibly empowering experience for the students. It's not what I'd call an easy experience. The majority of students come out of it really fired up, and the ones that don't, well, that's a useful thing for them to know. That's part of the educational process."

The lab work allows students to learn things "you can't readily codify in a book," he continued, stressing the real-time demands on both teachers and students. "When you're in the lab working with the students, in a sense you're doing it for real. You don't have a manual telling you what to do."

Students consider the course difficult and time-intensive, and claim that working in large teams can be demanding.

"We went through a lot in this class," said Mr. Chang. "Some people never want to see product design again, but I love it. It's what I want to do."

"While the team experience was very trying at times, I think it worked well, ultimately," said Aimee Angel, whose team created the Power-Up portable sitting and standing aid. "It was difficult to have 19 people with different skills and levels of dedication working on one project. But the experience was useful in a real-world context, and I think we all learned a lot through the process."

In addition to the Garden Bug and the Power-Up, the other 2.009 inventions are Get Up and Go, the Pool Lift, the Garbage Porter and Green Wagon. The last two joined Garden Bug in the Washington display.

Like the Bug, they're designed to help people with outdoor activities. The Green Wagon, a battery-powered wagon activated by a slight tug on its handle, can haul gardening tools and supplies. Its side rails also fold down into seats. The Garbage Porter, a battery-powered lift with powered wheels, can lift and transport heavy loads, making it useful for taking garbage cans to the curb or hauling firewood from shed to porch.

Power-Up and Garbage Porter will be demonstrated at the Lemelson-MIT Awards ceremony in New York on April 27, a black-tie event announcing the winners of this year's $500,000 Lemelson-MIT Prize and the Lifetime Achievement Award.

A version of this article appeared in MIT Tech Talk on April 26, 2000.

Topics: Innovation and Entrepreneurship (I&E), Contests and academic competitions


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