Multiple hearth furnace
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United States of America Patent
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Feb 26, 2013
Grant Date -
May 27, 2010
app pub date -
Feb 15, 2008
filing date -
Feb 16, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multiple hearth furnace including a rabble arm with a tubular structure and a solid plug body. The latter is received in a socket arranged in an arm fixing node. It has an axial through boring and cooling fluid supply and return channels arranged around this through boring. A clamping bolt is rotatably fitted in the through boring. It has a bolt head, which can be brought by rotation into and out of hooking engagement with an abutment surface on the arm fixing node. A threaded end of the clamping bolt sticks out of the through boring at the rear end of the plug body. A threaded sleeve, which is screwed onto this threaded end, bears on an abutment surface at the rear end of the plug body for exerting a clamping force onto the clamping bolt.
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