BigPatents India

Process for manufacturing stronger open top steel drum comprising step of (a) forming cylindrical steel drum by resistance welding along longitudinal over lapping Joint; (b) providing reinforcement to the upper joint of the open top drum by inserting a rounded sheet in the form of pipe inside the curling of the drum body; (c) providing centrally a pair of rolling hoops to the said drum;(d) providing extra reinforcement the said hoops with one or two extra layer of sheet overlapping the contour of rolling hoop around the drum in the form of a strip folded at edges and enough width required to overlap the contour of the rolling hoop and leaving some extra width on both the sides and the said reinforcing strip is curled to a suitable diameter or folded at the ends to avoid sharp edges and the said strip is folded rounded in a diameter just sufficient to slip over the outside of diameter just sufficient to slip over the outside of diameter of the drum and held tight in position;(e) the said rolling hoop is either expanded or rolled with the said additional sheet in position and spot welded; (f) providing dished end bottom cover to the said cylindrical drum by folding flanges of said drum and dished end cover together with double or triple seam Joint;(g) making a dished end top cover with flange curled to the matching with the curled top of the said drum and forming annular groove at the edge of the said dished end cover;(h) providing additional layer of sheet to the said dished end top cover in the form of a flange one end of which is curled and held tight in position in the said groove of the dished end and the other end overlapping the dished end curled portion to cover the entire width of the dished end curling and end folded under the said curling to hold it in that position.(i) the said additional sheet with the top cover is spot-welded at different place;and (j) providing a locking ring made of steel sheet of semi circular cross section with a inner diameter to match the outward dimension of the top end curling and is fixed to secure the drum body against the top dished end and is clamped with a sealing gasket of a suitable cross section in between. Drawing: 05 Sheets. Total Pages: 16. Fig. Nil