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