Abstract: A magnetic anchoring apparatus, comprising in combination: an external ferromagnetic crown provided with a base plate and lateral walls; at least one group of four pole pieces defining pairs of corresponding poles of an anchoring surface, said pole pieces presenting their longitudinal axes at right angles to the base plate and in correspondence with the apexes of a square. The apparatus comprising moreover a plurality of permanent magnets for feeding the aforesaid poles, interposed between the pole pieces and, respectively, between the latter and said ferromagnetic crown.

Abstract: The lifting device consists of an outer magnetic yoke and internal pole pieces forming an anchoring or working surface, with secondary permanent magnetic elements located between the yoke and the aforementioned pole pieces. There is also a reversible permanent magnetic element which may be rotated manually on a parallel axis to the said pole pieces, between an operative position in which its magnetic field is parallel to that of said secondary magnetic elements, and an inoperative position in which the magnetic field is short-circuited.