Abstract: This assembly includes an elastic and porous base spring layer intended to be placed facing a surface, in particular of an automobile vehicle, and an intermediate insulation layer impervious to the passage of air, the intermediate layer being positioned on the base spring layer. The airproof intermediate layer has a surface mass density of less than 500 g/m2, the sound proofing assembly including a porous stiffening layer, positioned in contact with the impervious intermediate layer. The porous stiffening layer has a smaller thickness than the thickness of the base spring layer and a flexural stiffness, reduced to a unit width, of more than 0.01 N.m.

Abstract: This assembly includes an elastic and porous base spring layer intended to be placed facing a surface, in particular of an automobile vehicle, and an intermediate insulation layer impervious to the passage of air, the intermediate layer being positioned on the base spring layer. The airproof intermediate layer has a surface mass density of less than 500 g/m2, the sound proofing assembly including a porous stiffening layer, positioned in contact with the impervious intermediate layer. The porous stiffening layer has a smaller thickness than the thickness of the base spring layer and a flexural stiffness, reduced to a unit width, of more than 0.01 N·m.

Abstract: The inventive method includes the following steps: bringing a plurality of disjointed ribbons (32) of fibers into parallel, at least one ribbon (32) containing long natural fibers; dispersing the adjacent ribbons (32) through a field of tips (60) to form a strip (62) of parallel fibers; tensioning and stretching the strip (62) in the field of tips (60) parallel to an axis of travel (B-B?); binding the fibers of the stretched strip (62) to form the web (60).

Abstract: The assembly comprises a base spring layer made with a base of a resilient porous material, and the base spring layer being intended to be placed opposite a surface of the automobile. It comprises a stiffening layer arranged above the base spring layer and having a surface density greater than 250 g/m2 and at least one resilient porous upper layer arranged on the stiffening layer. The stiffening layer is made with a base of a dense porous material having a resistance to air flow strictly greater than 2000 N·m?3·s. The assembly advantageously has an upper resistive layer.

Abstract: This component comprises a first mat of felt and a second mat of felt, each felt mat comprising fibers and a resin binding the fibers. It comprises a spacer interposed between the first mat and the second mat, the first mat and the second mat being fixed to opposite faces of the spacer. At least one of the first mat and the second mat comprises at least 50 wt % of wood fibers bound together by the resin.

Abstract: The present invention provides a support device. The support device includes a strap, the active length of which is variable, the strap supporting the accessory against the bearing element. The device includes a rail extending between two ends along the strap, the rail is secured to the wall, and a sliding element which slides along the rail, the sliding element includes a passage into which the strap is to be inserted. The device includes an adjustment device for adjusting the active length of the strap. The strap can be extended, relative to the adjustment device, between a retracted configuration, in which the active length is at a minimum, and an extended configuration, in which the active length is at a maximum. The adjustment device includes an element for returning the strap to the retracted configuration thereof.

Abstract: The device includes supports (30), a shelf (32) rotatably mounted about a transverse axis (B-B?) and a mechanism (34) for articulation of the shelf (32) relative to the supports (30). The mechanism (34) includes an abutment surface (76) delimited by the shelf (32) and a complementary abutment surface (90) delimited by the support (30), which are intended to slide on each other during the pivoting of the shelf (32) about its transverse axis (B-B?) in order to prevent radial movement of the shelf (32) towards the front with respect to the transverse axis (B-B?). The mechanism (34) includes a retaining surface (82) integral with the shelf (32) and a complementary retaining surface (96) defined by each support (30) which co-operate for each inclined position of the shelf (32) in order to prevent radial movement of the shelf (32) towards the rear with respect to the transverse axis (B-B?).

Abstract: This method includes the placing of the first porous layer (1) onto one part of a wall of a mold cavity having the shape desired by the soundproofing component, the first layer (1) not occupying the entire cavity, and the injection of a foaming polymer composition into the cavity of the mold to form the second open-cell porous layer (3). The two steps of placing the practically airtight intermediate layer (2) onto the first porous layer (1) and of injecting a polymer composition in order to form the second porous layer (3) are carried out simultaneously in a single step of injecting the foaming polymer composition.

Abstract: The assembly comprises a base spring layer made with a base of a resilient porous material, and the base spring layer being intended to be placed opposite a surface of the automobile. It comprises a stiffening layer arranged above the base spring layer and having a surface density greater than 250 g/m2 and at least one resilient porous upper layer arranged on the stiffening layer. The stiffening layer is made with a base of a dense porous material having a resistance to air flow strictly greater than 2000 N.m?3.s. The assembly advantageously has an upper resistive layer.

Abstract: A soundproofing assembly includes stacked layers in the form of a first set of layers (36) having good resistance to the passage of air, and a second set of layers (24) with mass-spring function including a layer (28) having a heavy viscoelastic mass and a spring type layer (26); the first set of layers includes a layer (36) of a foam with open cells of high porosity, high tortuosity and good resistance to the passage of air, the layer (36) having, owing to its high tortuosity, excellent sonic absorption properties at medium and high frequencies. The invention is useful for soundproofing motor car passenger compartments.

Abstract: This method includes the placing of the first porous layer (1) onto one part of a wall of a mould cavity having the shape desired by the soundproofing component, the first layer (1) not occupying the entire cavity, and the injection of a foaming polymer composition into the cavity of the mould to form the second open-cell porous layer (3). The two steps of placing the practically airtight intermediate layer (2) onto the first porous layer (1) and of injecting a polymer composition in order to form the second porous layer (3) are carried out simultaneously in a single step of injecting the foaming polymer composition.

Abstract: The device includes supports (30), a shelf (32) rotatably mounted about a transverse axis (B-B?) and a mechanism (34) for articulation of the shelf (32) relative to the supports (30). The mechanism (34) includes an abutment surface (76) delimited by the shelf (32) and a complementary abutment surface (90) delimited by the support (30), which are intended to slide on each other during the pivoting of the shelf (32) about its transverse axis (B-B?) in order to prevent radial movement of the shelf (32) towards the front with respect to the transverse axis (B-B?). The mechanism (34) includes a retaining surface (82) integral with the shelf (32) and a complementary retaining surface (96) defined by each support (30) which co-operate for each inclined position of the shelf (32) in order to prevent radial movement of the shelf (32) towards the rear with respect to the transverse axis (B-B?).

Abstract: A sound-insulation component for a rigid structural member, of the type including a mass-spring system (12) includes at least one layer of a heavy mass (16) and one layer defining a spring (14), and a sound absorption system (18) with two layers having different air-flow resistances. The structural member is a metal sheet, the mass-spring system (12) is provided on one side of the rigid structural member (10), and the sound absorption system (18) is provided on the other side of the rigid structural member (10). The first layer (22) among the two layers of the sound absorption system (18) consists of a non-woven fabric having an adjustable air-flow resistance. Application in the sound insulation of automobiles.

Abstract: A soundproofing assembly includes stacked layers in the form of a first set of layers (36) having good resistance to the passage of air, and a second set of layers (24) with mass-spring function including a layer (28) having a heavy viscoelastic mass and a spring type layer (26); the first set of layers includes a layer (36) of a foam with open cells of high porosity, high tortuosity and good resistance to the passage of air, the layer (36) having, owing to its high tortuosity, excellent sonic absorption properties at medium and high frequencies. The invention is useful for soundproofing motor car passenger compartments.

Abstract: A soundproofing assembly intended, in particular, to soundproof a motor vehicle. The inventive assembly includes four stacked layers, consisting respectively of: a first layer having an air resistance of between 500 and 2,000 N·m?3.s; a second porous, acoustic spring-type layer having a resistivity of between 10,000 N·m?4.s and 50,000 N·m?4.s; a third viscoelastic, airtight, heavy mass-type layer having a density that is greater than or equal to 1,500 Kg/m3 and a surface density of between 0.2 Kg/m2 and 9 Kg/m2; and a fourth porous, acoustic spring-type layer having a resistivity of between 10,000 N·m?4.s and 50,000 N·m?4.s.