Tamperproof construction for hydrant actuating nut
US4936336A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1989 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Oct 30, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/9247
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A tamperproof construction for preventing actuation of the actuating nut of a fire hydrant comprising a nut actuating body for receiving the hydrant nut in turning relationship, set screws locking the nut actuating body to the actuating nut, a shroud permanently secured on the nut actuating body by means of a snap ring so that it covers the set screws but is rotatable on the nut actuating body, a bore in the shroud for permitting selective access to the set screws, a key-operated plug in the bore, a cap permanently and rotatably mounted on an end of the nut actuating body which protrudes through an opening in the shroud, and a limited axial portion of the nut actuating body exposed between the cap and shroud for receiving a specialized wrench.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.