Corrosion-resistant self-locking manhole cover
US9157212B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2012 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Jul 31, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/0817
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A corrosion-resistant self-locking manhole cover includes a cover plate adapted to rest on a manhole cover support surface of a manhole frame. An anchor on the cover plate is adapted to engage the manhole frame at a first location in a manner that resists lifting of the cover plate proximate to such location. A locking member on the cover plate is movable between a locked position and an unlocked position. In the locked position, the locking member is adapted to engage the manhole frame at a second location in a manner that resists lifting of the cover plate proximate to such location. In the unlocked position, the locking member is disengaged from the manhole frame. A quick-latch mechanism is operable without using a key or other tool to release the locking member from its unlocked position to allow the locking member to return to its locked position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.