Pop-up sprinkler with shock absorbing riser spring
US5823439A · kind A · utility
35Cited by
7References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Aug 16, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B15/74
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A sprinkler unit comprises a tubular housing having an inlet for connecting to a source of water, a tubular riser telescopically reciprocally mounted in the tubular housing and moveable from a retracted position within the housing to an extended position from the housing, the riser having an outlet having a nozzle for distributing a stream of water outward from the housing, a passage connecting the inlet to the outlet, a retraction spring normally biasing the riser to the retracted position, and a shock absorbing coating on the retracting spring for absorbing the shock of movement of the riser to the extended position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.