| 摘要 |
A pen-caliper device includes a pen assembly having a pen barrel, a ballpoint ink cartridge in the barrel, and a mechanism engaging the ink cartridge and the barrel for advancing the ink cartridge to position a ballpoint of the ink cartridge for writing, and later retracting the ballpoint into the pen barrel. The pen-caliper device also includes a caliper assembly having first and second caliper arms each having a pointed tip. First and second gear elements are attached to pivot ends of the first and second caliper arms, respectively. The first and second gear elements engage each other to cause symmetrical opening and closing of the first and second caliper arms. A snug-fitting rigid sheath is slidable over either the caliper assembly or the pen assembly, so a user can remove the sheath from the caliper assembly to expose the first and second divider arms and slide the sheath over the pen assembly for safe-keeping while using the caliper assembly. The user then can place the sheath over the caliper assembly and retract the ballpoint tip so the pen-caliper can be safely carried in a pocket of user's clothing or the like.
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