| 摘要 |
PURPOSE:To tighten up a supporting lever and a stay easily in a crossing state by forming nonround holes, each having a smaller diameter than screw heads, on both sides of a retainer, and forming a projecting piece at the engagement part of a screw rod. CONSTITUTION:In a retainer 11, a through hole 151 at one engagement part 114 has such size that a screw rod 16 is inserted, but a screw head 161 is not inserted, and the hole is long lengthwise. The other engagement part 115 has a small hole 152 where the screw head 161 is not passed and a large hole 153 where the head 161 is passed at close positions. The screw rod 16 has a projecting piece at the engagement part. Then, a fixture 8 is put in contact with a stay 1 and a retainer 11 is attached and then stuck by being tightened up by using the screw rod 16. In this case, the lower engagement part 115 of the retainer 11 is rotated as shown by an arrow 19 to align the large hole 153 to the head 161, thus pressing the engagement part 115. Then, the retainer 11 is moved down to position the engagement part 16, in the small hole 152, and a thumbscrew screwed into each screw rod 16 is clamped. |
