| 摘要 |
<p>Device for driving a rigid elongate element such as a rod or tube in its longitudinal direction, comprising a frame, at least two engaging systems arranged on the frame which each comprise an endless flexible member provided with engaging elements and guide means for guiding each of the endless members, wherein the guide means of each system are arranged such that they define a part of the endless flexible member in which the engaging elements co-act with those in a corresponding co-acting part of another system, and drive means for driving at least one of the endless members.</p> |
