| 摘要 |
The mechanical pencil contains a tubular body having a bottom cap and a top cap. Inside the mechanical pencil, a tip element is positioned inside and protrudes from the bottom cap, a clamping mechanism is above the tip element with a spring therebetween, and a sliding mechanism is above the clamping mechanism. A single lead is stored in the sliding mechanism and is held by the clamping mechanism. When the lead outside the tip element is used up and the tip element is pressed, the spring is compressed and a segment of the lead is advanced into the tip element. When the tip element is released, the tip element is pushed downward by the spring and the segment of the lead is brought along with the tip element. By repeating the process a number of times, the lead would be extended out of the tip element.
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