An Improved Air Seal or Closure Device.


107,423. Robinson, P. J. June 29, 1916. Cleaning externally.-A packing for the chain of a scraper for an economizer or feed-water heater comprises a sleeve A, Figs. 1 and 2, fromed with cruciform grooves C, D mounted loosely on a plate B, the opening in which is of the same diameter as the scraper rod, so that. if the sleeve A is lifted by the scraper rod, the opening in the plate B is at the same time closed. The grooves in the sleeve A may be chamfered at the ends of the sleeve. The joint between the. plate B and the economizer may be formed by a packing-ring inserted in a groove in the plate B,




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