Patent ID: 8166889
Filing Date: 2012-05-01
Classification: B61D

Abstract:
1. A communication bellows having a closed contour comprising: at least one external skin which has a succession of inwardly directed undulations; at least one internal skin which has a succession of outwardly directed undulations which are provided facing the inwardly directed undulations of the external skin; the internal skin and external skin together delimiting an acoustic insulation space, the two skins having a closed cross-section; some of the inwardly directed undulations of the external skin being connected to at least some of the outwardly directed undulations of the internal skin, thereby connecting the external skin and internal skin; remaining undulations of the internal skin and external skin being separate from each other; and hinges flexibly connecting the inwardly directed undulations and outwardly directed undulations which extend over a majority of a length of the inwardly directed undulations and outwardly directed undulations.