Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
November 24, 2009
Patent Application Number
11761246
Date Filed
June 11, 2007
Patent Primary Examiner
Patent abstract
A safety door for covering openings in a rotary kiln during maintenance operations on the rotary kiln. The door is affixed to the exterior surface of the rotary kiln and includes a hatch pivotally secured at one side edge thereof by a pivot rod to a frame. A plurality of tension coil springs are disposed on the pivot rod and continuously bias the hatch toward the opening with a force of approximately 400 pounds.
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