Pressure jet cleaning appliance
US5397054A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1993 |
| Grant date | Mar 14, 1995 |
| Priority date | — |
| Expiry date | Aug 20, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B2201/1201
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pressure jet cleaning appliance having a pressure pump (10) driven by a drive (11). The appliance includes a conduit having a primary line (14) for directing fluid into a spray gun (15) and a bypass line (19) for recycling fluid through the conduit when the spray gun is turned off. A control valve (18) has a reciprocal piston (28) responsive to fluid pressure within the primary line such that the piston moves into a closed position thereby directing fluid through the bypass line when the spray gun is turned off. The piston is directly connected to a control element (22) in the drive such that movement of the piston is translated into displacement of the control element. With this configuration, the piston actuates the control element to reduce the speed of the drive when the piston is in the closed position and to increase the speed of the drive when the piston is in the open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.