Patent ID: 8324521

Claim:
A bellows for a vacuum interrupter having an evacuated envelope, the bellows in a free state comprising: a plurality of convolution elements and a plurality of support elements alternately connected together and being symmetric about an axis that extends centrally through the bellows, each adjacent pair of convolution elements being connected with and spaced apart by an intervening support element, and each adjacent pair of support elements being connected with and spaced apart by an intervening convolution element; each convolution element being of a convolution length along the axis and being of a convolution height perpendicular to the axis; each support element being of a spacing length along the axis; and at least one of: at least a first convolution element having a first convolution length different than another convolution length of another convolution element situated adjacent the at least first convolution element, and at least a first support element having a first spacing length different than another spacing length of another support element situated adjacent the at least first support element.