| 摘要 |
The access cover or gully grating comprises a tray shaped main body 30 and at least one lifting device 32 which comprises a key 42 capable of being retracted or extended such that in the retracted position the key lies flush with or below the upper surface of the main body, with a limiting element provided on the main body which engages with the key to limit the extent of retraction and extension. The key is preferably in the form of a bar 45 bent into a generally rectangular partial loop which defines an aperture. The key is preferably located in a housing 44 formed from a single sheet of material, the limiting element being formed by a bent portion of the housing. A lid may be provided to cover the key when in the retracted position and more than one key may be provided. Also claimed is a method for providing a lifting device for an access cover. |
