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When wresting the screws, people are used wresting the screws in a condition that they cannot be wrested any more. However, sometimes it is unnecessary actually, because the behaviour will damage the screw holes. Meanwhile, it will lead to difficulty of unbolting screws。There is a soft buffer layer on the handle of “L.P Screwdriver”, which can avoid people wresting screws tightly partly. Moreover, the design of guided anti-skid arris can remind people to wrest screw in right direction.
Dalian Minzu University
Dalian, China
Xuefei Liu
Di Fang
Xueqi Zhang
Jun Meng