| 摘要 |
PURPOSE:To soften impact and suppress breakage when a load over a prescribed value is applied, by tightening a half divided bearing on both the outsides of the elastic bush of a swivel bracket by a bolt and supporting a supporting shaft, and allowing a bolt to be cut when a load over a prescribed value is applied, and permitting the swivel bracket to be moved. CONSTITUTION:A cylindrical elastic bush 9 is inserted into a shaft hole 8 at the front edge of a swivel bracket 2, and a supporting shaft 3 is inserted into the center hole 10 of the elastic bush 9. Further, a half divided bearing 11 is tightened by a bolt 12 at both the outsides of the elastic bush 9 at the front edge of the swivel bracket 2, and the supporting shaft 3 is supported. A groove 13 is formed at the neck part of the bolt 12, and the bolt is tightened on the swivel bracket 2 by a prescribed torque, and the bolt 12 can be broken when a load over a prescribed value is applied. When the bolt 12 is broken, the half divided bearing 11 is demounted, and the swivel bracket 2 moves within the elasticity range of the elastic bush 9, and the impact is softened, and breakage can be reduced. |
