Manhole frame
A manhole frame comprises an annular-walled ring for supporting a cover or grate near its upper edge and a mechanically compressible resilient layer (3) shaped to conform to the wall of the annular ring and disposed in the space between the outer wall of the annular ring and the ground or similar st...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A manhole frame comprises an annular-walled ring for supporting a cover or grate near its upper edge and a mechanically compressible resilient layer (3) shaped to conform to the wall of the annular ring and disposed in the space between the outer wall of the annular ring and the ground or similar structure when the annular ring is vertically displaced. |
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