ELEKTROMAGNETISCHER VIBRATOR

摘要

A head expander for attachment to the armature head 7 of an electromagnetic vibration generator is of generally frusto conical form and comprises an upper support plate or working platform 1 at its larger end and a lower plate 2 at its smaller end. A cellular structure 3 of honeycomb form extends between the plates 1 and 2 with the axis of the cells normal to the plane of the plates and a plurality of stiff walled load transmitting tubes 4 extend through the cellular structure parallel to the axis of the cells. The cellular structure 3 is of layered or sandwich form with each cellular layer separated from its adjacent layer or layers by a separator sheet 5. An outer side wall covering or skin 8 is provided to enclose the cellular structure 3. The head expander is generally frusto-conical in shape. <IMAGE>