| 摘要 |
PURPOSE:To lower breaking load, to reduce a shock exerting influence on movement, and to stabilize quality, by reducing the remaining thickness by applying thuriting on bridge parts. CONSTITUTION:Bridges 2 are manufactured by processing a hoop material 3 to form pilot holes 4 and hoop base plates 1 by means of pressing and thuriting. The remaining thickness of the bridge parts are reduced by performing the thuriting of the bridges 2 having the thickness of the hoop material 3 left as it is. Thus, its breaking load is lowered, and a shock exerting influence on movement is reduced. |
