DIAPHRAGM WITH TAPER-CYLINDRICAL MOUTHS, METHOD AND MOLD FOR ITS PRODUCTION Russian patent published in 2009 - IPC H02K5/12 B29C43/18 B29C33/20 

FIELD: physics.

SUBSTANCE: in compliance with the proposed invention, a strip of crude rubber mix made by calendaring or some other way to arrange the polymer molecules longitudinally is wound up on the core perpendicular to its axis and along its generating line. Then the workpiece is formed and vulcanised in the mold providing for uniform simultaneously-all-round molding of the said rubber mix and preventing difference of pressure at the mold plates joint. The proposed mold comprises at least three plates molding the diaphragm, the core for molding internal cavity and directing elements for plates and the core. One of the plates has side members with inclined surfaces on their inner part, located along an axis of the core that make the guides for the other mold plates made so that to allow a uniform simultaneously-all-round molding of the said rubber mix around the core on closing the mold.

EFFECT: higher reliability of diaphragm.

2 cl, 11 dwg