| 摘要 |
PURPOSE:To stabilize the support of cap core and ensure stable rotating torque by comprising a cap core to a square metal case where the threaded part at any one side surface among opposing two surfaces is divided into two sections and suporting such cap core with three points. CONSTITUTION:The threaded portions 7, 8 having the width W determined arbitrarily are provided with an interval T at the one side surface of freely selected opposed to side surfaces 6, 6 of a square metal case having a driver hole 5 and moreover the threaded portion 9 having the width Y determined arbitrarily is provided to the other surface. The cap core 10 is supported by a three points by three threaded portions 7-9 thus provided. The width W of the threaded portion 7, 8 can be narrowed by supporting the cap core at the three points. As a result, these threaded portions 7, 8 generate the elastic effect and thereby a torque of cap core 10 at the rotating period can be stabilized. |
