Hand drier with backward curved impeller fan
US4993172A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 17, 1989 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Aug 17, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA45D20/16
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
There is provided a hand drier comprising: a rigid housing having an air inlet and an air outlet; a flow passage through the housing having the inlet as its upstream end and the outlet as its downstream end; a fan incorporated in the flow passage the fan being in the form of a backward curved multi-bladed radial flow device; a heat transfer volume incorporated in the flow passage, the volume housing a heating element; a motor mounted in the housing for driving the fan, the motor being a brushless direct current device; and control means for operating the motor and heating element. The term `backward curved` applied to a blade refers to a blade which, when viewed along the axis of rotation of the fan, has a root from which the blade extends both outwardly and backwardly relative to a radius from the axis of rotation extending through the root. Thus relative to the direction of travel the root is the leading part of the blade and the outer end the trailing part. Among major benefits arising from the use of a brushless direct current motor are: the shape of the motor which takes the form of a cylinder with a small height by comparison with its diameter which is a convenient shape to i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.