MOTION DRIVE WITH CIRCULAR BELLOWS Russian patent published in 2004 - IPC

FIELD: motion of working members from one position to another. SUBSTANCE: proposed drive has two bellows arranged coaxially one inside other; circular space between bellows is blanked-off at end faces and is used for connection with pressure source; cavity of inner bellows is open. Besides that, inner and outer bellows may be connected by means of strips connecting outer circumference of corrugation of outer bellows and inner circumference of corrugation of inner bellows; holes are provided for communicating all parts of circular space. EFFECT: avoidance of contamination. 5 dwg