Patent ID: 7887252

Claim:
An easy-lift and waterproof manhole assembly comprising a circular frame ( 1 ) and a cover ( 2 ) characterized in that: A supporting unit ( 5 ) is provided at a side of the frame ( 1 ) and the cover ( 2 ); a first end of the supporting unit ( 5 ) is fixed securely onto a bottom side of the cover ( 2 ) and a second end thereof is coupled with a trough ( 12 ), provided on said frame ( 1 ); a hydraulic device ( 3 ) is provided at a same side as the supporting unit ( 5 ) and a first and second ends thereof jointed with the frame and cover ( 1 , 2 ) respectively, and a locking mechanism ( 4 ) is disposed on an opposite end of the supporting unit ( 5 ) for sealing the cover ( 2 ) and frame ( 1 ) tightly; said hydraulic device ( 3 ) contains a prestored pressure for lifting the cover ( 2 ) when the locking mechanism is released.