| 摘要 |
Segmental outward projections ( 12 ) are provided at radially opposite positions on the circumference of a tubular mount portion ( 7 ) of a main body ( 5 ), and truncated side portions ( 13 ) are provided between and at the opposite sides of the segmental outward projection ( 12 ). On the other hand, D-Shaped inward projections ( 14 ) are projected radially inward from a boundary portion between fore and rear inner peripheral surface portions ( 10 B) and ( 10 C) of a shaping air ring ( 10 ) in such a way as to define an outward projection passageway ( 15 ) conforming in shape with the segmental outward projections ( 12 ). At the time of mounting the rotary atomizing head ( 4 ) on the rotational shaft ( 3 ), the outward projections ( 12 ) are put in a conforming angular position relative to the outward projection passageway ( 15 ) to pass the inward projections ( 14 ). In the event the rotary atomizing head ( 4 ) is loosened and its position is shifted in a forward direction relative to the rotational shaft ( 3 ), the outward projections( 12 ) are abutted against the inward projections ( 14 ) to prevent the rotary atomizing head ( 4 ) from falling off the rotational shaft ( 3 ).
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