High pressure liquid rotary nozzle with coil spring retarder
US5909848A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 17, 1998 |
| Grant date | Jun 8, 1999 |
| Priority date | — |
| Expiry date | Jul 17, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B3/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A high pressure liquid nozzle housing encloses a self-rotating speed-controlled nozzle. A cylindrical sleeve in the housing forms an inwardly facing friction surface engageable by a nozzle-driven friction generating speed control mechanism to provide increasing retarding force on the nozzle as nozzle speed increases for controlling maximum nozzle rotational speed. The speed control mechanism includes a radially expandable helical coil spring rotatable with the nozzle with its windings at low nozzle speeds slightly spaced from the sleeve. An input end of the coil spring is driven by the nozzle structure in a direction tending to unwind the spring and increase its outer diameter in response to rotation of the nozzle. An output end of the coil spring rotatably drives a cluster of centrifugal weights which are spring biased away from the sleeve and which at low nozzle rotation speeds also remain spaced from the sleeve. At higher speeds of nozzle rotation the weights move outwardly and frictionally engage the sleeve and provide a drag on the output end of the spring to aid in unwinding the spring, increasing its diameter and moving it with progressively increasing force into friction cr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.