| 摘要 |
PURPOSE:To scrape and drop powder, dust, cutting chip, dirty mud, etc. adhering to the root of an external thread, by providing a sloped surface, contained with a part of an internal thread, to at least one end side axially of a main unit. CONSTITUTION:An internal thread main unit 1 is screwed to an external thread 24 of an external thread lever 23, rotated in a fixed position, by an internal thread 3, and sloped surfaces 2 are positioned to provide axial length with the upper part longer while the lower part shorter. If a member 22 is allowed only with linear movement by a guide and the like and limited its rotary movement, the main unit 1 is axially moved by rotation of the external thread lever 23 in accordance with a rotary direction of the lever 23. Here a root 26 of the external thread 24 is rotated while approximating to an end edge part 6 of a crest 4 of the internal thread 3, and powder or the like adhering to the root as an integral unit, if the root comes to a position of said edge part 6, can be scraped and dropped by grease and the like attached to said root 26, thus the powder never intrudes into a fine gap formed with the crest 4 of the internal thread 3. |
