| 摘要 |
PURPOSE:To simplify construction and facilitate imposition by forming an annular passage which is an orifice by simple superposition of an outer hat member and an inner hat member of pressed products as a sectioning means. CONSTITUTION:A sectioning means sectioning the inside to a pressure receiving room 16 and a balancing room 20 is formed by superposing an outer hat member 12 and an inner hat member 14 which are pressed goods. By this superposition of hat members 12, 14, an annular passage 50 is formed between both the members as an orifice. An elastic movable plate 82 is valcanized-contacted to the center of the inner hat member 14. |
