| 摘要 |
The lower shaft (1) has an upper device (5) for direct or indirect coupling to a bottom plug. In connection with the non-rotary component (2) is an upwardly open and downwardly closed container (7) for collecting fluid which tends to run downwards along the non-rotary component in connection with the initial loosening of the bottom plug. - By means of the container (7), the downwardly running fluid is prevented from coming into contact with the shaft (1) which is held by the hand of the operator. |
