Patent ID: 8875385

Claim:
An apparatus for retaining a package of laminations of an electromagnetic core in a device ( 3 ) for the production of said package of laminations, said device ( 3 ) including a yoke ( 2 ) and a sleeve ( 6 ) within said yoke ( 3 ), said apparatus mounted into a panel ( 1 ) that is spaced a distance away from said yoke ( 2 ), wherein within said panel ( 1 ) a cylinder ( 7 ) is arranged co-axially with respect to said sleeve ( 6 ), said cylinder ( 7 ) housing a hydraulic piston ( 8 ) with a piston rod ( 9 ) with a coaxial drilled hole ( 12 ), wherein on the top of said piston ( 8 ) adjacent to said sleeve ( 6 ) there is a pivotally mounted panel ( 10 ) that is simultaneously supported on said piston ( 8 ) by a spring ( 11 ), wherein said pivotally mounted panel ( 10 ) with an adjustment screw ( 2 ) therein is supported by said spring ( 11 ) and simultaneously axially led within a guide ( 19 ) under which a sensor ( 21 ) is arranged on the top of said piston rod ( 9 ), said sensor ( 21 ) detecting the working abutment of said piston ( 8 ) with said pivotally mounted panel ( 10 ) to a first lamination of the fabricated package of laminations ( 5 ) within said sleeve ( 6 ), wherein said piston rod ( 9 ) is further led within said cylinder ( 7 ) at a distance by means of three mutually distant gaskets ( 14 ) in order to create two spaces ( 15 ) and ( 16 ) between said piston rod ( 9 ) and said cylinder ( 7 ) in that a central section ( 9 a ) of said piston rod ( 9 ) is thinner and that both spaces ( 15 ) and ( 16 ) are provided with hydraulic connections ( 17 ) and ( 18 ) for an alternate supply of pressurized oil into one or another space ( 15 ) and ( 16 ).