| 摘要 |
A strata coring device for coring weak material has a core barrel (20) with a cutting tool at one end (23). A core holder (26) is inserted into the barrel (20) and after coring takes place the holder is advanced in the barrel so that fingers (28) at the end of the body of the holder close in over the core by driving the fingers against an internal shoulder (37) of the core holder. <IMAGE> |
