Ground working tool and method for its operation

摘要

The invention relates to a ground working tool (10) comprising a tubular base body (20) with an inner receiving space for receiving a cylindrical core of solid ground material (11), connecting means (23) for connecting the tubular base body with a rotary drive means and locking means for locking the core in the receiving space of the tubular base body. The locking means comprises at least one locking unit (30) having a guide rail (32) being disposed at an inner side of the tubular base body and arranged with a deviation angle relative to a tangential direction of the tubular base body and the locking unit further comprises at least one locking element (31), which is moveably mounted on the guide rail between a radially outer releasing position and a radially inner locking position, in which the core (11) is clamped within the receiving space by means of the at least one locking element. The invention furthermore relates to a method for operating a ground working tool.