Resumen
Adjustable pre-frame and stiffener for sliding doors. The precerc of the invention provides greater rigidity to the part of the headboard that is housed inside the partition, which prevents loss of leveling. Specifically, the pre-frame includes a vertical spar (1) and two vertical spars (2) between which the door slides, so that between the vertical spar (1) and the two vertical spars (2) rests a headboard (3). ) to establish the passage, while laterally to the vertical stringers (2) there is arranged a headboard (4) which is housed inside the partition (10), this head (4) comprising a pair of registers (5). ) and registration frames (6) with covers (18), with a smooth part (7) and a rough part (8), allowing access for any type of maintenance and providing rigidity to the system. (Machine-translation by Google Translate, not legally binding)