Patent ID: 6848468

Claim:
A drain cover assembly comprising: a drain cover unit including a cover plate formed with a drain hole; and a closure device operable so as to close and open said drain hole, said closure device including a pivot arm having a mounting portion connected pivotally to said cover plate, a flow control portion extending from and disposed on a first side of said mounting portion and registered with said drain hole, and a weighted portion extending from and disposed on a second side of said mounting portion opposite to said first side; said weighted portion having a weight sufficient to overcome weight of said flow control portion so as to cause said pivot arm to pivot from an open position to a normal closed position, where said flow control portion closes said drain hole; said pivot arm pivoting from the normal closed position to the open position when said flow control portion is subjected to an applied load through said drain hole that is sufficient to overcome the weight of said weighted portion; wherein said drain cover unit further includes a pivot seat mounted fixedly on said cover plate and having said mounting portion of said pivot arm mounted pivotally thereon; and wherein said pivot seat is a hollow seat that is registered with said drain hole and that has a first open end fixed to said cover plate, and a second open and opposite to said first open and, said second open end leaving a periphery said flow control portion having a peripheral section that engages said periphery of said second open end when said pivot arm is disposed at the normal closed position.