(19)
(11) EP 2 434 067 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.09.2014 Bulletin 2014/37

(43) Date of publication A2:
28.03.2012 Bulletin 2012/13

(21) Application number: 11182174.0

(22) Date of filing: 21.09.2011
(51) International Patent Classification (IPC): 
E04B 1/86(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 22.09.2010 IT MI20100293 U

(71) Applicant: DONATI GROUP S.P.A.
24030 Medolago (Bergamo) (IT)

(72) Inventors:
  • Donati, Francesco
    24030 Medolago (BG) (IT)
  • Donati, Giuseppe
    24030 Medolago (BG) (IT)

(74) Representative: Cicogna, Franco 
Ufficio Internazionale Brevetti Dott.Prof. Franco Cicogna Via Visconti di Modrone, 14/A
20122 Milano
20122 Milano (IT)

   


(54) Metal composite sound absorbent structural panel


(57) A metal composite sound absorbent structural panel, characterized in that said panel has a high flexural thickness and comprises two flat plates coupled by glueing a fret element, made of aluminium, steel or other metals or alloys and comprising a first and second plate elements adapted to be coupled to one another thereby being substantially parallel, through an interposition of a corrugated coupling element comprising a fretted element; on one or both said plate elements being formed a double hole series: a series of vertical holes and a series of horizontal holes; the hole pattern geometry of one of said plate elements or both said plate elements, independent from one another, being made based on a Hemholtz resonance principle.







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