Washing-machine laundry drum
View Patent ↗A laundry drum is configured for high-speed spinning of damp linen. The drum has a rotating drum shell, which is curved from a thin-walled material strip to form a cylinder. The parallel end edges of the material strip contact to form a joint line. So that the drum may resist drum speeds higher than 1500 rpm, the end edges have a slot-shaped teething. The teeth and of the teething engage into the respective tooth gaps of the opposite end edge, so that the base lines of the tooth gaps meet to form an at least approximately straight line. The teeth are fitted into the non-toothed zone of the end edge outside of the drum above the material strip, each tooth being firmly secured to the respective non-toothed zone.
1. A washing-machine laundry drum suitable for high-speed spinning of wet laundry, comprising:
a rotatable drum shell formed of thin-walled strip material having substantially parallel end edges and bent into a cylinder with said parallel end edges contacting one another along a connecting seam;
said end edges having a crenellated toothing formation formed with teeth and tooth gaps defined by tooth-gap base lines, said teeth engaging in respective said tooth gaps of a mating said end edge;
said tooth-gap base lines of said end edges butting against one another and forming a substantially straight line; and
said teeth projecting onto non-toothed regions beyond said straight line on an outer surface of said cylinder, and being fixed to said non-toothed regions.
2. The laundry drum according to claim 1 , wherein said teeth are angled outwardly about a wall thickness of said strip material of said drum shell.
3. The laundry drum according to claim 1 , wherein said teeth are fixed to said non-toothed regions with at least one riveted joint each.
4. The laundry drum according to claim 3 , wherein said riveted joint comprises a substantially tubular protuberance projecting outwardly from said non-toothed region, through a hole formed in a respective said tooth, and crimped over behind said tooth.
5. The laundry drum according to claim 1 , which comprises a carry-along element formed inside said drum shell and covering said connecting seam.