English: push drill, one of the very few mechanisms that use a screw in the "backwards" sense, to convert linear motion to rotational motion. It has helical screw threads with a very large pitch along the central shaft. When the handle is pushed down, the shaft slides into pawls in the tubular stem, turning the bit. Most screws are "self locking" and axial force on the shaft will not turn the screw.
日期
2007年5月19日 (原始上传日期)
来源
自己的作品 (Original text: Photograph by Bill Bradley. billbeee 21:25, 19 May 2007 (UTC))
Feel free to use it, just credit me as the photographer.
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原始上传日志
The original description page was here. All following user names refer to en.wikipedia.
2007-05-19 21:25 Billbeee 1088×118× (113120 bytes) Photograph by Bill Bradley. ~~~~ Feel free to use it, just credit me as the photographer. You can contact me through my website [http://www.builderbill-diy-help.com/ my website] == Licensing == {{self|GFDL-no-disclaimers|cc-by-2.5}}