Patent ID: 9630801
Date: 2017-04-25
CPC Classifications: B08B,B65H,F28G

Claim:
1. 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 and rear walls; an array of upper and lower drive rollers in the outer section each rotatably supported by an axle shaft passing through the spaced outer and inner walls; a drive motor within the mid section; a drive sprocket fastened to each of the shafts in the inner section of the housing; wherein each lower drive roller shaft is rotatably supported in a fixed position in each of the outer and inner walls and supported by both the outer and inner walls; and each of the upper drive roller axle shafts is parallel to the lower drive roller axle shafts and is rotatably supported by a block carried in the mid section of the housing by parallel pivoting link members each extending from the block parallel to one of the outer and inner walls and wherein each pivoting link member is fastened to one of the outer and inner walls adjacent one of the lower drive roller shafts.