| 摘要 |
PURPOSE:To make it possible for one operator to conduct an attaching work for a measuring instrument by preventing it from falling from a disc at the time of attaching it to the disc. CONSTITUTION:In a measuring instrument, a falling preventive member 11, which prevents falling from a disc 8 of a drum section 2 by projecting one end section to the outside of the drum section 2 and abutting one end section against the rear 10 of the disc 8 when the drum section 2 is inserted into a drum-section inserting hole 5 and in which one end section is displaced to the drum section 2 side and passed through the drum-section inserting hole 5 during a time when the drum section 2 is inserted into the drum-section inserting hole 5, is mounted on the outer circumferential section of the drum section 2. |
