LOCKABLE SIGNALLING COLUMN

摘要

The invention relates to a signalling column with levels which are assembled by means of a relative pivoting limited in amplitude and interconnected by means of axially-extending conductors. The body of a level (A) has a locking bar (30) which extends axially to penetrate an opening (23) in the adjacent level and abuts an edge of said opening on a rotation attempt. The ends (30a, 30b) of the bar may be displaced and the opening is of such a size as to accommodate the top end of the relevant bar and the bottom end of the bar above.