| 摘要 |
A cover and frame assembly (10) for an access hole (14), the frame (12) having a lower section for engaging with and supporting a cover (16) when the latter is seated within the frame (12), and an upper section incorporating a substantially vertically disposed resiliently deformable seal which is deformed by insertion of the cover (16) within the frame (12) to provide effective sealing of the gap between cover (16) and frame (12). Conveniently, the frame (12) and the cover (16) are both made from injection moulded composite material, although the frame (12) may be of metal, e.g. aluminium. A method of manufacturing a frame (12) for use in a cover (16) and frame assembly (10) for an access cover (16) comprises laying in a mould an insert having detent means for releasably securing a seal thereto, placing a structure including fibres into the mould and injecting a liquid resin into the mould having first masked the detent means in the insert to prevent ingress of resin, allowing the assembly to set or cure, demoulding the frame (12) with the insert integrally moulded therewith and removing the masking to reveal the detent means, and inserting one or more cooperating flange members of a resiliently deformable seal into said detent means to releasably secure the seal to the insert. A further method of manufacturing an access cover frame (12) from prefabricated parts to very close tolerances. |
