Mixed wooden-metal subframe for security entrance doors to homes, characterized by being formed by a chassis; of vertical rectangular wood with two vertical sides (1) joined together by a knuckle head (2) (by spikes) and horizontal braces equidistant (3) existing between the head (2) and the sides other oblique braces (4) at an angle whose vertex is the center of the head. The stringers have metal clamps (5) in a "U" shape that are fixed to the wooden chassis by means of screws each, and in addition, the claw (6) is welded thereto. 2.premarco mixed wood-metal for security doors of entry to homes, characterized according to claim 1, because when the gap is greater than the pre-frame, on the outer edge of the stringers and knuckle head three temporary caps are placed (7) which consist of three strips, which are suppressed when the pre-frame is received by placing lacquered covers (8) in the slacks thereof. (Machine-translation by Google Translate, not legally binding)
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