| 摘要 |
<p>The instrument has an open end closing unit (20) including butterfly valves (21) where each valve is assembled between opening and closing positions around a pivoting axle. A movement transferring unit (31) is integrated to a tubular body (30), synchronized by a retractable unit and connected to the valves for transferring a movement applied on an actuator (35) into a pivoting movement of the valves. The retractable unit has a cylindrical cam (40) with helices (41, 42) that are fastened by cam guides (37, 12) integrated to the body and a retractable writing point e.g. nib, respectively.</p> |
