Power washing apparatus
US5040950A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1989 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Aug 7, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB08B2203/0282
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A portable, high-pressure, power washing system is described which includes an electric motor driven gear pump where the electric motor is effectively water cooled by virtue of being contained in a thermally conductive housing surrounded by an insulating water jacket through which the water being pumped is made to flow before reaching the pump's inlet port. The pump is driven through a gear reduction mechanism such that a relatively inexpensive, single-phase, series AC (universal) motor normally operating at a high rpm can be employed. By proper dimensioning of the pump chamber relative to the drive and idler gears and by providing a flow divider at the pump chamber's discharge orifice, high pumping efficiency is obtained. Completing the assembly is a discharge wand for directing the high pressure water at the surface to be cleaned and for controlling the on/off state of the pump's drive motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.