| 摘要 |
A split spring steel ring having a channel-shape cross-sectional configuration is sewn into the bottom cuff of a filter bag. The split ring is placed into the opening in the thimble plate of a plenum chamber by lapping the ring at the split and pushing inward until the diameter is reduced for insertion into the opening. The ring is then allowed to expand until the ends abutt at the split. The ring is maintained in its expanded condition in interlocking engagement with the opening by a thimble extension which extends through the ring below the thimble plate of the plenum chamber.
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