| 摘要 |
PROBLEM TO BE SOLVED: To enable a user to visually recognize a current set flow rate of working fluid during adjustment of the flow rate in a dental handpiece which adjusts the flow rate of the working fluid. SOLUTION: In the inner peripheral surface of an operation ring 70, a guide groove 72 extending in the range of a rotation angle of <360°is formed so as to prevent the operation ring 70 from rotating 360°or more. Within the range of the rotation angle of <360°in the outer peripheral surface of the operation ring 70, flow rate marks corresponding to the minimum flow rate position and maximum flow rate position of a movable valve element 62 are provided. COPYRIGHT: (C)2010,JPO&INPIT
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