Lockable composite manhole cover system, apparatus and method
US10704221B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2017 |
| Grant date | Jul 7, 2020 |
| Priority date | — |
| Expiry date | Nov 22, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/1427
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A lockable manhole cover system including a manhole cover and a locking mechanism attached to the bottom surface thereof and including a fixed end and an actuated end, each including locking pins movable between locked and unlocked positions. The actuated end includes a keyed lock. When in the locked position, the free ends of the locking pins extend beneath a flange prevent the cover from being lifted up. When the actuated side is moved to the unlocked position via the key, the locking pin free ends retract such that the cover is free to be lifted from the ring. On the fixed side, the locking pins are biased to move to their extended positions upon manual depression of a release stem located at the upper surface of the cover.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.