Patent ID: 8375813

Claim:
A rotary drive, said rotary drive comprising: (a) a drive element; and (b) an outer tube; (i) at least one end piece that is able to rotate in relation to said outer tube and cannot shift axially; (ii) at least one helical slider arranged able to move axially in said outer tube but not rotatable; and (iii) at least one helical shaft arranged axially parallel in said outer tube, which interacts by a thread with a thread profile of said at least one helical slider; and (c) wherein said relative axial movement of said helical slider and said helical shaft brought about by said drive element is transformed into a relative rotation of said outer tube and said end piece; (d) wherein said drive element is arranged coaxially inside said outer tube; and (e) wherein said helical shaft and said thread profile of said helical slider are arranged coaxially in said outer tube, and (f) an end piece is mounted coaxially in at least one end of said outer tube.