Steel structure for a door opening in a building wall, with rabbet and counter frames, has spaced anchors for mounting at the brickwork and aligned sleeves to the take the U-rod locking them together

摘要

The steel door opening structure, for mounting in a wall, has a rabbet and a counter frame with spaced anchors (1,4,5) to hold them at the brickwork. The anchors and a holder (3) fixed at the frame have aligned sleeves (9) to take the U-shaped locking rod (2) holding them together, with a sleeve length longer than the rod diameter.