| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent the scattering of oil from the interfaces 8a, 16a of a mantle core 8 and a spherical surface support 16. SOLUTION: The mantle core 8 is supported by the spherical surface support 16 in a freely revolvable manner and an object to be crushed is crushed between the mantle 9 on the core 8 and a bowl liner 10. An oil fence 30 is attached to the whole periphery of the spherical surface support 16 and an annular ring 29 is fixed to the whole periphery of the lower edge of the fence 30 and fitted to the outer peripheral surface of the spherical surface support 16 in a freely up and down movable manner and a spring 27 for energizing the ring 29 upwardly is provided between the ring 29 and the spring receiving seat 28 of the spherical surface support 16. At the time of crushing, the core 8 is raised and lowered by the biting of a large object to be crushed to generate a large gap between the core 8 and the support 16 and, when the core 8 returns so as to eliminate this gap, oil is scattered outwardly from the gap. However, the fence 30 follows the movement of the core 8 by the spring 27 to come into contact with the undersurface of the core 8 and always closes the gap to effectively prevent the scattering of oil.
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