Pressure responsive locking latch arrangement for manhole covers
US9416516B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 2015 |
| Grant date | Aug 16, 2016 |
| Priority date | — |
| Expiry date | Feb 19, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/1463
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A manhole cover assembly is adapted to be received in an opening in a frame enclosing a vault chamber. A manhole cover is fit into the opening. A pair of lugs are mounted to an underside of said manhole cover on opposite sides thereof. Each lug has a portion projecting radially out in a first position so as to engage a fixed feature of said frame. At least one of said lugs is connected to a pivotable member having an upper end projecting up through said manhole cover so that said upper end is engageable to be able to be rotated and cause rotation of said lug therewith between the first position and a second position with said lug not projecting radially out such that the lug radially clears said fixed feature of said frame to allow said manhole cover to be moved up and out of said frame opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.