Patent ID: 8006857

Claim:
A cover assembly for a trash bin which is installed onto a bin of the trash bin, comprising: a support ring including a compartment axially formed on the interior edge thereof; a cover installed on a side of the support ring abutting with the compartment and mounted on the support ring; a pivoting device disposed in the compartment of the support ring and connected to the cover and the support ring, with the pivoting device including an elastic element mounted therein; a buffer device disposed in the compartment of the support ring and abutting with the elastic element of the pivoting device, with the buffer device including a driving element having a first end formed on an end thereof and receiving the elastic element and a second end opposite to the first end; and an adjusting element abutting with the second end of the driving element and including an elastic element mounted thereon, wherein the buffer device includes a pressed element having a first end abutting with the elastic element of the adjusting element and a second end formed thereon opposite to the first end and abutting with the driving element; wherein the elasticity of the elastic element of the adjusting element is smaller than the elasticity of the elastic element of the pivoting device; wherein while the cover is mounted on the support ring, the elastic element of the pivoting device is pressed and allows the driving element to be in a first position and the adjusting element to be released; wherein while the driving element is in a second position, the pressed element is provided to press the adjusting element; when the cover is open, the elastic element of the pivoting device is released and the driving element is driven to press the elastic element of the adjusting element; wherein part of the force from releasing the elastic element of the pivoting device provides to press the elastic element of the adjusting element so that the force to lift the cover is weakened and the speed of lifting the cover is retarded.