Cover assembly for an access hatch to an underground chamber, includes a grill located beneath the main closure assembly

摘要

The opening structure (3) for an underground chamber is generally square or circular in configuration that is closed by a main cover hatch (4). Located directly beneath the main cover is a secondary grill assembly (5). The grill articulates about a fixing point (6) such that it can be pivoted upwards. when the main cover has been released thus enabling access to the chamber.