| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a dental handpiece where the reciprocating inversion angle of a cutting tool is enlarged (for instance, to an extent of 100°-135°). <P>SOLUTION: The dental handpiece is structured as follows: a reciprocating inversion mechanism 4 includes an almost spherical inversion axis 40 pivoted between input- and output-side rotary shafts 361, 362 and having input- and output-side guide grooves 401, 402, a spherical concave part 41 set up to the rotary shaft 361 and engaged with one semispherical side of the inversion axis 40, a guide pin 411 engaged with the guide groove 401, a spherical concave part 42 set up to the rotary shaft 362 at the output side and engaged with another semispherical surface side of the inversion axis 40, and a guide pin 421 engaged with a guide groove 402; and is structured inside a grip 3. The respective guide grooves 401, 402 of the inversion axis 40 can be formed so as to have an optional depth using the whole of the spherical body of the inversion axis 40, and the setting area of the angle of the respective guide pins 411, 421 set in accordance with the inversion angle of the cutting tool, is widen. <P>COPYRIGHT: (C)2013,JPO&INPIT |
