Patent ID: 6772775
Filing Date: 2004-08-10
Classification: F28G

Abstract:
A drive assembly for a sootblower that includes a carriage and a lance tube affixed to said carriage having one or more nozzles for directing a jet of fluid cleaning medium against surfaces to be cleaned, comprising:a drive motor providing a rotary shaft output; a lance rotational drive train having two or more non-circular gears in meshing engagement having a drive train input coupled to said drive motor rotary shaft output and having a drive train output wherein said non-circular gears provide a variable drive ratio such that the relationship between the angular speed of said drive train input to the angular speed of said drive train output varies with the rotational position of said non-circular gears; and a lance tube drive coupling said drive train output to said lance tube for causing rotation of said lance tube whereby said lance tube is driven for rotation at a non-constant speed.