| 摘要 |
A writing instrument has a hollow barrel with a reciprocable writing cartridge that is normally retracted by a spring and that is extended to writing position by sliding the clip. The clip mechanically engages the cartridge to extend it, and the ball of the clip fits in a recess in the barrel surface to hold the cartridge extended. Opening the clip to clip the pen in a pocket releases this hold on the cartridge, and the spring retracts the cartridge sliding the clip with it. The clip is so attached that manual pressure on the clip end away from the ball rotates the clip to open it.
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