Locking rod for cellar light shaft grill - is held by bolts with round heads and locking nuts

摘要

The locking rod is used for locking cellar light shaft covering grillages. This rod ensures that unauthorised persons cannot enter the cellar by lifting up the grill. The key rod is galvanised and provided with holes and it is pushed in a transverse direction under the frame of the grillage and bolted. These special bolts are positioned and screwed into the grill from above. The lower end of a bolt is secured on the underside of this rod by a nut and locking nut. These bolts cannot be released at the top because their heads and round anc cannot be gripped.