초록 ▼

An acoustic door comprises a frame as well as a first panel of gypsum mounted on the frame and having its outer face covered with a sheet of metal and its inner face covered with a layer of lead (Pb) to thereby form a first rigid wall. A second panel of gypsum of different thickness has also its out

An acoustic door comprises a frame as well as a first panel of gypsum mounted on the frame and having its outer face covered with a sheet of metal and its inner face covered with a layer of lead (Pb) to thereby form a first rigid wall. A second panel of gypsum of different thickness has also its outer face covered with a sheet of metal and its inner face covered with a layer of lead to form a second rigid wall. A strip of flexible material adhesive on both sides thereof is used to mount the second wall on the assembly frame-first wall while establishing no acoustic short circuit between them. The first and second walls are relatively thin while being sufficiently rigid whereby the space of air between the two layers of lead is maximized. This air space also contains acoustic insulation including fibers set into vibration to transform the mechanical energy of sound waves into heat. On the outside of the door, only a peripheral space exists between the two above-mentioned sheets of metal, which space is filled with a fire resistant, silicone sealant.

대표청구항 ▼

An acoustic door comprising: a frame; first and second opposite faces; a first wall mounted on the said frame and comprising (a) a first panel including a rigid, dense and visco-elastic material, and having a first coincidence frequency, an outer face and an inner face, (b) a first sheet of metal ap

An acoustic door comprising: a frame; first and second opposite faces; a first wall mounted on the said frame and comprising (a) a first panel including a rigid, dense and visco-elastic material, and having a first coincidence frequency, an outer face and an inner face, (b) a first sheet of metal applied on he outer face of the first panel to define the first face of the said door, and (c) a first layer of massive and very malleable material applied on the inner face of the said first panel and having a second coincidence frequency higher than the said first coincidence frequency; a second wall comprising (a) a second panel including a rigid, dense and visco-elastic material, and having a third coincidence frequency, an outer face and an inner face, (b) a second sheet of metal applied on the outer face of the second panel to define the said second face of the door, and (c) a second layer of massive and very malleable material applied on the inner face of the second panel and having a fourth coincidence frequency higher than the said third coincidence frequency; and means for mounting the second wall on an assembly formed of said frame and of the first wall while establishing no acoustic short circuit between the said assembly and the said second wall; the first and second walls accordingly presenting a structure allowing the said first and second walls to be relatively thin while being sufficiently rigid, so as to maximize a space of air between the first and a second layers of massive and very malleable material and thereby reduce the frequency mass-air-mass at which acoustic waves can be transmitted from one of the first and second layers of massive and malleable material to the other of said layers through the air in the said space.