Tubular double drum washing machines

Claim 1

IN A WASHING MACHINE, IN COMBINATION, SUPPORT MEANS; AN OUTER DRUM HAVING A NON-PERFORATED PERIPHERAL WALL AND BEING STATIONARILY SUPPORTED ON SAID SUPPORT MEANS; AN INNER DRUM HAVING A PERFORATED PERIPHERAL WALL TURNABLY MOUNTED IN SAID OUTER DRUM WITH ITS PERIPHERAL WALL SPACED FROM THAT OF SAID OUTER DRUM, SAID INNER DRUM HAVING AN OPEN CHARGING END AND AN OPEN OPPOSITE DISCHARGE END; A PLURALITY OF BEARING RAILS LOCATED SPACED FROM EACH OTHER IN AXIAL DIRECTION OF SAID DRUMS IN THE SPACE BETWEEN SAID PERIPHERAL WALLS IN SUBSTANTIAL SEALING CONTACT THEREWITH AND AT LEAST PARTLY SURROUNDING SAID INNER DRUM FOR DRIVING SAID SPACE IN A PLURALITY OF CHAMBERS ADAPTED TO CONTAIN WASHING LIQUID; AND A PLURALITY OF ANNULAR RIBS PROJECTING INWARDLY FROM THE INNER SURFACE OF SAID INNER DRUM SPACED FROM SAID OTHER IN AXIAL DIRECTION OF THE LATTER AND RESPECTIVELY ALIGNED WITH SAID BEARING RAILS SO AS TO DIVIDE THE INTERIOR OF SAID INNER DRUM INTO A PLURALITY OF ZONES CORRESPONDING IN SPACING TO SAID CHAMBERS.