A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Provided is a three-proofing cover, and the cover is a waterproof, stinking-proof ,and antitheft enclosed well lid, comprising a well lid and a well seat. The well lid is provided with a lifting hole. The back surface of the well lid is provided with reinforcing ribs. The edge of the well seat is provided with at least a circle of sealing groove. The sealing groove is embedded with a sealing ring. The edge of the lower surface of the well lid can be provided with a circle of pressure mouth which protrudes downwards. The pressure mouth is corresponding to the sealing groove.
Provided is a three-proofing cover, and the cover is a waterproof, stinking-proof ,and antitheft enclosed well lid, comprising a well lid and a well seat. The well lid is provided with a lifting hole. The back surface of the well lid is provided with reinforcing ribs. The edge of the well seat is provided with at least a circle of sealing groove. The sealing groove is embedded with a sealing ring. The edge of the lower surface of the well lid can be provided with a circle of pressure mouth which protrudes downwards. The pressure mouth is corresponding to the sealing groove.
| Online Contents | 2007
| British Library Online Contents | 2007
SOUND-PROOFING STRUCTURE, SOUND-PROOFING ENCLOSURE, AND SOUND-PROOFING BOX
| European Patent Office | 2019