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When people use screwdriver they have to rotate a driver many times. It is very uncomfortable work. So, auto screwdriver was invented. But, it needs electricity to work screwdriver. This can not be used in the place where there are no electricity. So,I designed my item. For this purpose, I used 'bevel gear' which can change the direction of the motion. First, select the direction to spin driver by pushing the button which is in the side of the driver. Second, pull the handle. Then, the string is unwinded and bevel gear starts to work and two gears which interlock vertically each other change the direction of the power.
Handong Global University
Pohang, South Korea
ChunCheon, South Korea