Patent ID: 7044478
Filing Date: 2006-05-16
Classification: B23B,Y10T

Abstract:
1. Mounting seat for machine-tools allowing coaxial engagement of a shank ( 2 c ) of a toolholder member ( 2 ), comprising internally a cylindrical bush ( 3 ) supporting a plurality of ball bearings ( 4 i ) arranged without play between an internal surface ( 1 i ) of the mounting seat ( 1 ) itself and an external surface ( 2 e ) of said shank ( 2 c ), said bush ( 3 ) being able to perform an axial sliding movement (S) towards the outside of the mounting seat ( 1 ) over a length smaller than or equal to an axial length (L H ) of its zone occupied by said ball bearings ( 4 i ), further axial travel thereof being prevented by an end-of-travel stop means ( 3 s , 1 r ) and the abovementioned bush ( 3 ) having, mounted on it, means able to prevent separation of the ball bearings ( 4 n ) when said zone thereof occupied by the latter is located outside of the mounting seat ( 1 ), in which the abovementioned bush ( 3 ) has a plurality of cavities ( 3 n ) able to house inside them a corresponding number of ball bearings ( 4 n ) projecting from both sides ( 3 a , 3 b ) of the bush ( 3 ) itself, the latter having, mounted on it, coaxially on the outside thereof, a cylindrical sheet-metal ( 5 ) cage which has, formed in it, a plurality of holes ( 5 n ) able to allow said ball bearings ( 4 i ) to rotate and project externally through them without being able to come out of said holes.