Mobile aggregate operated by rods, for underground mines, consisting of a system of external and internal braced in which the external propping system has two fastening parts joined by an anterior and a posterior cross, forming a gap between each other to accommodate the interior propping system, the slot being approximately the length of a transfer device that joins, both propping systems, longer than the base body of the interior propping system, having been provided with pylons or both sides of the body base of the internal system that exceed a lateral play, provided between the base bodies of both systems and that guide the systems in their posterior terrain, and having provided a pair of rods for the conduction of the system that engages in lateral channels of the base body of this system and that, for the conduction of the exterior system, it is provided with alignment wedges, whose rods are joined by a crosshead and which is articulated at a point on its central axis with an anchor located in front of the holding characterized in that the alignment wedges are arranged on the inner sides of the pair of rods and that it is provided in the the anterior cross-member of the outer base body has a downwardly directed support, which meshes between the wedges in the advanced position towards the extractor of the external propping system, the width of this support corresponding approximately to the shortest distance between the wedges. (Machine-translation by Google Translate, not legally binding)
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