44.
    发明专利
    未知

    公开(公告)号:FR2769397B1

    公开(公告)日:1999-12-10

    申请号:FR9712407

    申请日:1997-10-06

    Abstract: Window (9), fitted with fixed peripheral seal, has its edge (7) modified locally, e.g. by a buckling (11) of about 1 mm or by attaching a plastic or enamel projection of similar thickness to reduce noise radiation caused by acoustic field. Surrounding seal is similarly modified, and movement of the glass in the seal is diminished. Window glass has at least one edge distortion or increase in thickness, and the seal has at least one clip or hook in contact with the glass.

    CRISTAL PARA VENTANA DE VIDRIO LAMINADO DE AISLAMIENTO ACUSTICO.

    公开(公告)号:MX9603804A

    公开(公告)日:1997-07-31

    申请号:MX9603804

    申请日:1996-09-02

    Inventor: REHFELD MARC

    Abstract: La invencion se relaciona con un cristal para ventana laminado de aislamiento acustico, el cual incluye por lo menos una película de plástico que le da propiedades de amortiguamiento elevado o baja rigidez. Se propone combinar una película de alto funcionamiento acustico con otra película, que tiene funcionamiento acustico ordinario tal como PVB. Las dos películas pueden estar separadas por una película delgada impermeable, tal como tereftalato de polietileno. Los resultados acusticos son tan buenos como con la película acustica sola.

    48.
    发明专利
    未知

    公开(公告)号:DE69002842D1

    公开(公告)日:1993-09-30

    申请号:DE69002842

    申请日:1990-03-07

    Abstract: An acoustic window intended for land transport vehicles is proposed. Its index of acoustic attenuation differs by no more than 5dB from an index increasing by 3dB per octave from 800 to 2000 Hz, and by 1 dB per octave above this range. The examples are doubled-glazed windows or laminated windows in which the intermediate layer has a high attenuation. It is effective with respect to aerodynamic noise.

    Window frame air hole unit
    50.
    发明专利

    公开(公告)号:IT1184843B

    公开(公告)日:1987-10-28

    申请号:IT1915885

    申请日:1985-01-18

    Abstract: The acoustic insulation unit for an air hole in a window frame consists of a cover for the hole which encloses an absorbent element. The unit is made in the form of a casing, e.g. of aluminium or a synthetic material, containing an absorbent element which is of a larger area than the holes in the window frame. In between the absorbent element and the frame there is a gap which forms a duct joining all the air holes along one side of the frame. The casing can be aligned symmetrically with the hole or offset to one side. The frame can have an insulation unit on one or both sides.

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