Patent ID: 6054194
Filing Date: 2000-04-25
Classification: B60D,B61D,Y10T

Abstract:
A novel double inversion fold pattern which forms the corner of a bellow with an initial wall angle of .beta..sub.0 * degrees, consisting of a first inversion with design angle .chi..sub.1 degrees and a second inversion with design angle .chi..sub.2 degrees, where said angle .chi..sub.1 is in the range90-.beta..sub.0 */4<.chi..sub.1 <89and where said design angle .chi..sub.2 is determined by said design angle .chi..sub.1 and said initial wall angle .beta..sub.0 * according to.chi..sub.2 =.chi..sub.1 -(90-.beta..sub.0 */2)whereby said double inversion fold pattern allows a bellow to extend the longest possible distance without kinking and hence damaging the bellow panels.