| 摘要 |
<p>A gas-driven dental handpiece having vibration isolating means has a handle in two parts (25, 27). A joint is provided by a shaft (36) from the end of one part which fits in a chamber (42) in the end of the other shaft, leaving a small annular gap (43) between them which is occupied by resilient O-rings (40, 41) or the like, under compression. A small axial gap (35) is also provided between the parts (25, 27) so that they are not in direct contact, and the O-rings (40, 41) provide a rigid joint while reducing the transmission of vibration. A pin (49) may be provided, normally out of contact with one or other of the parts, to prevent relative axial or rotational displacement of the parts. The joint may be provided elsewhere in the handpiece; for example between the head and the handle. </p> |
