Electromechanical vibrators

Claim 1

A MOVING COIL ELECTROMECHANICAL VIBRATOR COMPRISING A POT MAGNET AFFORDING A SINGLE TOROIDAL MAGNETIC CIRCUIT AND CONSISTING OF AN INNER POLE PIECE AND AN ANNULAR OUTER POLE PIECE PROJECTING UP COAXIALLY FROM A BASE AND FORMING AN ANNULAR AIR GAP BETWEEN THEIR UPPER ENDS, AN EXCITING COIL ENCIRCLING THE LOWER PART OF THE INNER POLE PIECE SUBSTANTIALLY COAXIALLY, THE INNER POLE PIECE HAVING A SOLID LOWER PART AND AN UPPER PART AFFORDING A PLURALITY OF GROOVES LYING GENERALLY IN PLANES CONTAINING THE AXIS A TUBULAR SUPPORT AND A MOVING COIL CARRIED THEREBY AND SITUATED IN THE AIR GAP, AN OUTPUT MEMBER COMPRISED A TABLE SITUATED ABOVE THE MOVING COIL AND DIRECTLY CONNECTED TO THE UPPER END OF THE TUBULAR COIL SUPPORT, AND A PLURALITY OF WEBS LYING GENERALLY IN PLANES PASSING THROUGH THE AXIS AND EACH CONNECTED TO THE TABLE AND AT LEAST A PART OF THE SUPPORT ADJACENT THE LOWER END OF THE COIL WITH ITS LOWER EDGE SLOPING UPWARDS AND INWARDS FROM A POINT ADJACENT THE LOWER END OF THE COIL, THE WEBS BEING RECEIVED IN THE SAID GROOVES IN THE INNER POLE PIECE WHEREOF THE BOTTOM OF EACH GROOVE SLOPES INWARDS AND UPWARDS CLOSE TO THE LOWER EDGE OF THE CORRESPONDING WEB, AND MEANS MOUNTING THE SUPPORT AND THE OUTPUT MEMBER SO AS TO BE CAPABLE OF AXIAL VIBRATION.