| 摘要 |
A mounting seat ( 1 ) for machine-tools allowing coaxial engagement of the shank ( 2 c) of a toolholder member ( 2 ) includes internally a cylindrical bush ( 3 ) supporting a plurality of ball bearings ( 4 i) arranged without play between the internal surface ( 1 i) of the mounting seat ( 1 ) and the external surface ( 2 e) of the shank ( 2 c). The bush ( 3 ) is able to perform an axial sliding movement (S) towards the outside of the mounting seat ( 1 ) over a length smaller than or equal to the axial length of its zone occupied by the ball bearings ( 4 i), further axial travel thereof being prevented by end-of-travel stop elements ( 3 s , 1 r) and the abovementioned bush ( 3 ) having, mounted on it, elements able to prevent separation of the ball bearings ( 4 n) when the zone thereof occupied by the latter is located outside of the mounting seat ( 1 ). |
