| 摘要 |
The invention concerns a medical or dentistry instrument-holder (1) provided with an instrument (2), wherein an instrument driving mechanism (4) includes at least one rotary element (20) rotatably mounted by means of a bearing assembly (30, 130). The bearing assembly (30, 130) comprises at least one ball bearing including several balls (31, 131) arranged between an inner raceway (31a, 131a) and an outer raceway (31b, 131b) and is characterized in that the inner raceway (31a, 131a) of the ball bearing is formed by the front side of a first bearing element (32, 132) driven in rotation with the rotary element (20), and in that the outer raceway (31b, 131b) is formed by the front side of a second bearing element (33, 133) stationary relative to the rotary element (20). |
