Apparatus for indicating the cutting level of an advanceable underground extraction system, especially of a planing system

摘要

The indicator unit (28) according to the invention serves for indicating the respective control position or tilting position of an underground extraction system (planing system), which can be set at different cutting heights by tilting perpendicularly to the stratification by means of known jib controls or other lifting controls. The indicator unit (28) according to the invention is designed in a manner of a spirit level; it consists of a box-shaped housing with a viewing window arranged on at least one housing side and with a measuring fluid located inside the housing. The indicator unit (28) is preferably pivotable in the tilting plane in a joint (38) and can be fixed in the particular set position. IMAGE