Washing machine
US4631934A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1986 |
| Grant date | Dec 30, 1986 |
| Priority date | — |
| Expiry date | Feb 12, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06F23/04
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A washing machine includes a washing tub whose peripheral wall is constituted by an upper peripheral wall section and a lower peripheral wall section which is located below the upper peripheral wall section and which is driven to rotate clockwise and counterclockwise. The washing tub receives water and laundry therein. In the case of a small load of laundry, the laundry is caused to flow, and to be washed due mainly to the flow or water caused by the rotation of the lower peripheral wall section. In the case of a large amount of the load of laundry, the laundry can be washed due to the synergetic action of the frictional forces. In such a washing machine, the inner surface of the upper peripheral wall section is made gradually smaller in diameter from its lower portion to its upper portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.