Process of fabrication of drum bodies having rolling hoops and the drum bodies so produced
AssigneeGallay S.A.
InventorsLucien F. Le Bret, Robert Saada
Life of this patent
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Abstract
The present invention relates to a process of fabrication of drum bodies having rolling hoops, and the drum bodies so produced. The drum body is provided with a plurality of corrugations generally offset towards the center of the drum with the peaks of the corrugations in line with the undeformed part of the drum. At least one of the peaks of the corrugations is then expanded radially outwardly to make a rolling hoop.
Claims13
A process of fabrication of drum bodies having rolling hoops and a smooth cylindrical surface, the process comprising:
- (a) forming a plurality of corrugations on the smooth cylindrical outer surface of the drum, the corrugations comprising alternating circumferentially extending peaks and troughs, the troughs being offset towards the axis of the drum, at least one of the peaks having a diameter equal to that of the smooth surface;
- and
- (b) radially outwardly expanding a zone comprising said one peak between two immediately adjacent troughs and defining a rolling hoop having an outer diameter greater than that of the smooth surface of the drum and that of the other peaks.
In a drum body having a smooth cylindrical surface for part of its height and at least two rolling hoops, the improvement comprising:
- (a) at least one set of a plurality of corrugations comprising alternating peaks and troughs, the diameter of the troughs being less than that of the smooth surface and at least two peaks having a diameter equal to that of the smooth surface, the other peaks having a diameter equal to or greater than that of the smooth surface;
- and
- (b) each rolling hoop being positioned between two immediately adjacent troughs and being defined by an expanded one of the at least two peaks, said rolling hoop protruding radially outwardly with respect to the other peaks.
Dependencies are inferred from the claim text.