Sophisticated frame for protecting standard jamb e.g. door, installed in opening in sawn timber building, has shelf comprising side cuts in which posts of casing are inserted without notable friction due to compression of walls of beam

摘要

The frame (38) has two jointed casings (40, 42), where one of the casings comprising a lintel (44) is fixed at a U-shaped reversed internal rabbet. Side posts (46, 48) of the casing rest freely with respect to side edges of the reversed rabbet, where the side posts are masked by an external frame of the rabbet. A shelf (26) or a sill plate i.e. beam, comprises two side cuts (34, 36) in which the posts of the casing are inserted without notable friction due to compression of walls of the beam.