Patent ID: 8667756

Claim:
In a noise damper ( 70 ) that absorbs noise vibrations in a structure formed of a. a structural ceiling ( 22 ) that is a source of noise vibrations; b. hangers ( 40 ) that form a noise path for the noise vibrations, and that extend downward from the structural ceiling ( 22 ); and c. a suspended ceiling ( 43 ) that includes grid beams ( 21 ), supported by the hangers ( 40 ), that is a receiver for the noise vibrations; the improvement comprising a noise damper ( 70 ), made of flexible sound vibration damping material, inserted into a knock-out ( 73 ) in a web ( 29 ) of the grid beam ( 21 ) in the suspended ceiling ( 43 ), that insulates the hanger ( 40 ) from the grid beam ( 21 ) and absorbs the noise vibrations along the hanger ( 40 ), the noise damper ( 70 ) having a) a raised insert ( 71 ) on a lower segment of the damper that conforms in shape to the knock-out ( 73 ) in the web ( 29 ) of the grid beam ( 21 ); b) a lower lip ( 72 ) at the bottom of the raised insert ( 71 ) that engages a lower section of the knock-out ( 73 ) to secure the bottom of the damper to the grid beam ( 21 ); c) an upper lip ( 77 ) at the top of the raised insert ( 71 ) that secures the raised insert ( 71 ) in the knock-out ( 73 ) when the lower lip ( 72 ) on the raised insert ( 71 ) is engaged with the lower portion of the knock-out ( 73 ); and d) an inverted U-shaped upper portion ( 75 ) of the noise damper ( 70 ) that extends from the raised insert ( 71 ) over a bulb ( 48 ) of the grid beam ( 21 ), along with the lower section of the noise damper 70 , including the raised insert ( 71 ) on the lower section, that isolates the grid beam 21 from the e) hanger ( 40 ) which extends through a hole ( 80 ) in the lower section of the damper.