A conformal vacuum cup provides a machine tool attachment fitting usable in a flexible-track drill system. Using multiple, independently articulated stiffeners, the conformal vacuum cup conforms to the contour of complex aerostructure surface shapes. The individual stiffeners are decoupled from each...http://www.google.co.uk/patents/US7134649?utm_source=gb-gplus-sharePatent US7134649 - Conformal vacuum cup apparatus and method
