| 摘要 |
1507351 Retractable ball point pen KC PEN CO Inc 6 May 1975 [9 May 1974] 18990/75 Heading B6P Ball point refill 59 is advanced by pressure on the lower end of clip 49, as cam 56 drives down its (diagonally hatched) sliding follower inside the pen barrel, until its point locks over lip 47. When the refill is to be retracted pressure on upper arm 50 raises the sliding follower, by engagement of its protruding lugs with slotted brackets extending from the clip, and allows spring 65 to push the refill upwards.
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