Patent ID: 7082801

Claim:
Tightening and untightening device ( 20 , 30 ) for use on a rolling mill bearing assembly, with a box-like substantially toroidal shape and defining an axis, comprising first and second annulus-shaped plate elements ( 21 , 22 ) placed face to face at a predefined reciprocal distance along said axis, said first plate element ( 21 ) being solidarily fixed to an internal ring element ( 24 ) and provided with first coupling means ( 15 , 27 ) adapted to couple said tightening and untightening device ( 20 , 30 ) to a portion of said rolling mill bearing assembly during operation, said second plate element ( 22 ) being solidarity fixed to a ring shaped gear wheel ( 26 ) and provided with second coupling means ( 28 ) adapted to couple said tightening and untightening device ( 20 , 30 ) to a lock element ( 13 ) of said rolling mill bearing, said first and second plate elements ( 21 , 22 ) being joined by means of a roll bearing ( 25 ) for reciprocal relative rotation around said axis generated by means of a drive motor ( 31 ) solidarity fixed on said first plate element ( 21 ).