Patent ID: 6220145
Filing Date: 2001-04-24
Classification: F16K,Y10S,Y10T

Abstract:
An actuator for moving an attached object, comprising:a) an enclosed housing;b) a first flexible band further comprising:1) an exterior portion, extending out of the housing;2) a first interior portion, coupled to the exterior portion and located in the housing; and3) a second interior portion, coupled to the housing and to the first interior portion, and spaced from the first interior portion to form a cavity therebetween; and4) a fold portion intermediate the first interior portion and the second interior portion; and,c) a first cylinder disposed adjacent the fold portion configured to move in the housing with the fold portion and provide a seal between the cavity and the housing adjacent the fold portion;c) pumping means, coupled to the housing, for pumping fluid into the cavity and thus moving a fraction of the exterior portion into the housing.