| US 7,491,010 B2 | ||
| Road manhole | ||
| Arnaud Cuny, Domgermain (France); and Jacky Boca, Dieulouard (France) | ||
| Assigned to Saint-Gobain Pam, Nancy (France) | ||
| Filed on Dec. 12, 2007, as Appl. No. 11/954,412. | ||
| Claims priority of application No. 06 10908 (FR), filed on Dec. 14, 2006. | ||
| Prior Publication US 2008/0145147 A1, Jun. 19, 2008 | ||
| Int. Cl. E02D 29/16 (2006.01); E02D 29/14 (2006.01) | ||
| U.S. Cl. 404—25 [52/19; 52/20] | 17 Claims |
| 1. Road manhole, of the type defining a centre axis (X-X) and comprising:
a frame (4) which delimits an opening (6) and which is provided with an internal collar (8) which extends radially inwards,
a cover (10) which comprises a blocking web (12) which is intended to block the opening (6) and a cylindrical skirt (14) which is centred on the centre axis (X-X) and which substantially complements the internal collar (8), the blocking web (12) and the skirt defining a concave corner (16) which is directed radially outwards relative to the centre axis (X-X), and
a main gasket (18) which is arranged on the internal collar (8) and which is interposed between the cover (10) and the frame (4) when the cover is in a closed position,
the road manhole (2) comprising an auxiliary gasket (20) which is, at least in the closed state of the manhole, arranged on the skirt (14) and which is in contact with the concave corner (16),
characterised in that the main gasket (18) and the auxiliary gasket (20) are formed by two separate components.
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