| 摘要 |
PROBLEM TO BE SOLVED: To extend the period during which molten metal holds a pin and to enhance the sensitivity of a sealing mechanism to vapor temperature inside a jacket chamber, when the sealing mechanism which opens the jacket chamber at very high temperatures is constructed of a pin and molten metal holding the pin. SOLUTION: The jacket chamber 15 of a roller body 1 is provided with a sealing hole 16 and a sealing mechanism is comprised of a screw part having a through hole 20 communicated with outside air and threaded into a tapped hole 25 leading to the sealing hole 16, a valve part 17 fixed to the screws part for sealing the sealing hole 16, and a post part 30 fixed integrally with the valve part 17 and having its end extended into the jacket chamber 15. The valve part 17 and the post part 30 are provided with respective through holes 20, 31 that communicate with each other. A metallic pin 21 is passed through the through holes 20, 31 and molten metal is packed into the through holes 20, 31 in the valve part 17 and the post part 30. The pin is held within the through holes 20, 31 by the molten metal packed.
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