NTU students spend lots of time in tutorial rooms studying. However, the chairs in NTU tutorial rooms are uncomfortable. Seat pans and backrests are plastic and tables attached to right armrests are 20cm above the seat pans and too small to place taptops. Students complain about these chairs. According to our group’s survey, 70 of 72 SM2 students suffer backaches after long hours of writing sitting on the chairs. Since tables are fixed, most students are forced to bend down to write on the table for a long time, which puts a great strain on their backs and causes pain. Also, half students interviewed feel the illumination of rooms is inadequate. Therefore, we have modified the TR chairs to solve these problems.
2.1 Criteria for solution
The modified chairs should meet the following requirements:
•Tables are adjustable and easy to fold;
•Backrests support the back of the body;
•Seatmats are soft;
•Tables can generate light according to indoor lighting conditions; •Chairs are aesthetically pleasing;
•Cost is low.
2.2 Description of the solution
Our ‘wonderchairs’ are like glossy silver eggs made from hard glass-fiber reinforced plastic (GFRP). Chairs have three foldable layers with two wheels at the bottom. The top layer with one side stuffed with rayon can be flipped over as a backrest. The backrest is positioned at an angle of 100°and stuffed with soft Rayon stuffing which supports the back of the body comfortably. The second layer serves as a table with a 22cm-radius, overcoming the existing defect of being too small which hinders comfortable writing. It can be easily lifted and pushed forward by 20cm by pulling or rotating a lever to suit a student’ personal need so that he can write comfortably on the table. The third layer is a relaxing 24cm×24cm seat with a beige corduroy cover and Rayon stuffing. The tables can automatically generate light from LED lamps on the desktop. Lamps are 25cm sticks in a...