| 摘要 |
A seal is disclosed which permits a pull rod to be rotated and moved axially with respect thereto and which is provided with a plurality of washers arranged in a stacked relation so that their engagement with the peripheral surface of the rod removes any oxide impurities therefrom and provides for deposition of the impurities into a chamber that is a part of the seal for the rod. The chamber is connected to the atmosphere through a series of radial holes and by a clearance hole surrounding the pull rod to the interior of the furnace. Consequently, the pressurized gas normally in the furnace moves or flows along the pull rod and into the chamber. The gas is still under sufficient pressure so that the impurities deposited in the chamber can be removed through the radial holes.
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