Patent ID: 7032271

Claim:
A noise control device for a steel door installed in a casing, said noise control device comprising: a buffer fixed on the casing, shaped post-like, consisting of a hollow cylinder, a fitting member fixed on an outer surface of said cylinder, a round lower sponge of some elasticity contained in said cylinder, a coil spring of good elasticity positioned on said lower sponge in said cylinder, a rod located in said coil spring having a pair of opposite studs on its outer surface and contacting an upper end of said coil spring, a colliding member fixed around an outer end of said rod, an annular upper sponge of some elasticity located to contact an upper end of said studs and having a center hole for said rod to pass through, an annular cap fitting firmly around an outer end of said cylinder and having a center hole for said rod to pass through and positioning said lower sponge, and said coil spring in said cylinder: a stopping member fixed on the steel door and facing said buffer fixed on the casing, having two stopping layers and an intermediate soft layer sandwiched between said two stopping layers, an annular groove formed a central area of an upper one of said stopping layers and the intermediate layer facing said rod of said buffer: a shock-absorbing member fixed on the casing, consisting of two sound-absorbing layers and a tough layer, said tough layer wrapped by said two sound-absorbing layers: and a projecting member attached on an outer side of a deadbolt groove of the casing, having a vertical wall portion and a projecting portion extending sidewise and outward from an intermediate section of said wall portion to face the deadbolt of a lock fixed on the steel door.