B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
113/52
B21C 37/12 (2006.01) B21D 5/06 (2006.01)
Patent
CA 1037318
METHOD AND APPARATUS FOR FORMING CORRUGATED PIPE Abstract of the Disclosure A corrugated pipe forming apparatus and method in which flat sheet metal is passed through a plurality of first and second opposite roller pairs and deformed into a corrugated sheet. Lateral lips are formed parallel to the edges of the sheet and extend generally perpendicular to the sheet over the full length thereof. A pipe rolling machine helically deforms the corrugated sheet and folds the lip into a mechanical lock seam defining Pittsburgh lock of predetermined dimensions and tolerances. To maintain such dimensions and tolerances the width of the lips is adjusted by simultaneously moving one roll of each set in identical increments towards and away from the otherroll of each set to thereby correspondingly change the depth of , the corrugations and the width of the lips. The sheet can be moved laterally to maintain the lips of equal width. Corrugating stations of the device are defined by opposed corrugating rollers with the upper rollers held on a first frame and the lower rollers held on a second frame. Each frame includes opposite and rigid sides interconnected by fixed rigid axles. Opposed upper and lower rollers are journaled at their respective ends about each of the respective axles. The rollers, of solid and continuous cylindric sidewall construction to their full length, have an improved bending strength and corresponding reduced dimension. An improved drive of adjacent pairs of lower rollers is provided through shafts journaled between the lower rigid frame sides. These shafts, through gearing, - 1 - drive on either side lower corrugating rollers through gearing. The upper opposed rollers are in turn driven by their lower opposed rollers. These upper rollers are driven directly by low tolerances, high backlash gears between the upper and lower rollers that enable towards and away adjustment of the upper and lower rollers while meshing and driving contact of the gears is maintained. The interstitial distance between the upper and lower rollers is produced by four interlinked screw adjustments to provide precisely identical upper and lower roller corrugating adjustments with a minimum of operator or mechanic attention. Rollers for providing a lock seam at the end of the machine are provided with individual adjustability. -1a-
228658
Pratt Howard G.
Sivachenko Eugene W.
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