On one end of a traverse (1) is double-armed lever pair (2) turnably linked mirror-wise to one another. One of the lever arm pair (2a) is connected with a lift system (5) on the upper part of the traverse via linking rods (4). The other lever arm pair (2b) is on the lower part of the traverse and has hook-shaped ends. On the upper side of a heat insulating hood (6), carrier lugs (6a) are coupleablly arranged, whilst an electric pulling magnet (7), with its associated anchor (8), is on the traverse and the upper lever arm pair that lie opposite one another. Detachable inter-locking alignment elements (9,10) can be arranged on the surface between the traverse and the heat insulating hood.
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