| 摘要 |
<p>PURPOSE: To easily operate a metal fitting for cable connection by a screw terminal by forming a screw thread for holding in the inside part of a cylindrical hole of a cap and making the length of the outside part of the cylindrical hole to be not shorter than the length of the screw thread part of the screw. CONSTITUTION: A fastening washer 13 installed in a core axis 12 of a screw axis 11 in a manner the washer can idly move is moved downwards by operating a screw head 10 by cooperative movements of screw threads T1, T'1 to fasten a cable F. In such an electrical apparatus, the screw axis 11 is held by cooperative movements of the screw thread T2 of the screw part 15 of the head 10 and the screw thread T'2 formed in a cylindrical hole 17 of a cap E. At that time, the holding screw thread T'2 is formed only in the inside part 19 of the cylindrical hole 17, and the outside part 20 is made to have no screw thread and be longer than the length L2 of the screw thread T2. Consequently, an operational part 16 of the head 10 rotates and moves the screw axis 11 upwards by the driver, and the released washer 13 is stopped at the contact face 21 of the cap E and then the screw part 15 is positioned in the outside part 20.</p> |
