Apparatus with an electric motor and a magnetic protection device

Die Erfindung betrifft ein mehrteiliges Elektrogerät mit einer magnetischen Sicherheitseinrichtung. Die Sicherheitswirkung einer solchen Einrichtung wird dadurch erhöht, daß ein zusätzlicher Magnet (19, 22) vorgesehen ist, der in den magnetisch leitenden Übertragungsteilen (13-17) remanenten Magnetismus durch zwangsläufige gegenpolige Magnetisierung beseitigt. 1. Multi-part apparatus which is operated by an electric motor and equipped with a magnetic safety device, having a first part (2) of the apparatus containing the electric drive motor and a switch (10) which controls this and can be actuated by magnetic fields, a second part (1) of the apparatus containing at least one main magnet constructed in the form of a permanent magnet, as well as a third part (3) of the apparatus containing at least one magnetic conductor wherein the lines of force originating from the main magnet only reach the vicinity of the magnetic conductor when the whole assembled apparatus is in the correct closed position and only in this position is the magnetic flux which is transferred to the magnetic conductor and transmitted by it sufficient to initiate actuation of the switch (10) constructed close by on the other end of the magnetic conductor, characterized in that, apart from the main magnet, a subsidiary magnet is constructed in the form of a permanent magnet on the second part (1) of the apparatus, that the magnetic flux of the subsidiary magnet is oppositely directed to that of the main magnet, that during the disconnection or assembly of these parts (1, 3) of the apparatus, the lines of force originating from the subsidiary magnet reach the immediate vicinity of the magnetic conductor and that the magnetic flux density entering the magnetic conductor from the subsidiary magnet and conducted to the magnetically actuable switch (10) is lower than that of the main magnet.