Flexible tube cleaning lance drive apparatus

A flexible lance drive apparatus comprising:

• a generally rectangular housing having a front wall and a rear wall, an outer section, an inner section and a mid section defined between a pair of spaced parallel outer and inner walls perpendicular to and extending between the front wall and the rear wall;
• an array of upper and lower drive roller pairs in the outer section each rotatably supported by an axle shaft passing through the spaced outer and inner walls;
• a pneumatic drive motor within the mid section having a drive sprocket extending into the inner section;
• a drive sprocket fastened to each of the axle shafts in the inner section of the housing and connected to the drive motor via a serpentine belt;
• wherein each lower drive roller axle shaft is rotatably supported in a fixed position in each of the outer and inner walls;
• and
• each of the upper drive roller axle shafts is rotatably supported by a block carried in the mid section of the housing by at least two parallel pivoting link members each extending from the block parallel to one of the outer and inner walls in the mid section and wherein each pivoting link member is fastened to one of the outer and inner walls adjacent one of the lower drive roller axle shafts.