A roof-bar of mechanised longwall supports.

摘要

1. The roof-bar of mechanised longwall supports consists of longitudinal ribs and transversal ribs that form a flat grid, covered with a top working plate at the top and with the bottom plate at the bottom. It is characterised in that it has at least one column brace (1), mounted in the top plate (2) and the bottom plate (3). The column brace (1) is located in the field between the longitudinal ribs (5) and the transversal ribs (4).