| 摘要 |
A sleeve of a dental handpiece is connected directly or via an intermediate sleeve to a drive motor by means of the engagement of a hook, mounted on an elastic arm secured to the motor, in an annular groove formed in the sleeve. The hook is selectively displaced from the groove to uncouple the sleeve and motor by axially displacing a shift member, externally mounted on the sleeve, which causes a sliding ring connected with the shift member to pass over the hook and displace the same from the groove against the opposition of the resilient arm.
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