| 摘要 |
<p>PURPOSE:To speedily and strongly perform fixation after pulling a shaft which is inserted and housed in a base pipe by a specified length. CONSTITUTION:A fastening cylinder is loosely penetrated by a shaft 20. A pair of support arms 322, 323 are opposedly arranged on the fastening cylinder. A rotary holder 331 is arranged between the support arms 322 and 323. A base of the holder 331 is connected to a rotary shaft 332 which is rotatably supported at its both ends by means of a pair of support arms. Female screws 332a, 332b are formed on the rotary shaft, which screws are opened to both ends and has winding directions opposed to each other. A pair of fixed screws 333, 334 on the support arms 322, 323 are screwed with the female screws in an unrotatable manner. By the rotation of the holder 331, the paired screws simultaneously approach each other or leave for extanding or contracting a diameter of the fastening cylinder. The fastening force can be adjusted by forming a spiral uneven surface 335 on one of the fixed screw 333 and the support arm 323, and forming an adhering surface 336 on the other.</p> |
