| CPC B65D 85/04 (2013.01) [B23K 9/133 (2013.01); B65D 25/108 (2013.01); B65D 25/22 (2013.01); B65H 75/16 (2013.01); B65H 2701/36 (2013.01)] | 17 Claims |
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1. A drum for containing a coil of welding wire, comprising:
a container having:
a bottom,
side walls for delimiting a cavity in which the coil can be housed, the cavity having an internal diameter, and
a top,
wherein the container has a tapered shape so that said internal diameter decreases from the top to the bottom and a residual space remains between the coil and the side walls of the container;
a lid to close the top of the container; and
a filling element which is arranged inside the container between the coil and the side walls, shaped to extend into said residual space, which is comprised between an inner surface of the side walls of the container and a lateral surface of an imaginary cylinder having a base substantially equal to the bottom of the container, and configured to compensate for the tapered shape of the container in order for an unwinding of the coil to occur with uniformity like in a cylindrical drum and unaffected by a fact that a distance between the coil and the side walls of the container varies with height.
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