Importance

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Abstract

A coupling portion is provided on an outer peripheral side of a rotational shaft, a stationary ring is mounted on a fore end portion of an air motor, a rotatable ring is rotatably attached to a stationary ring, and slide plates are provided between the stationary ring and the rotatable ring movably in radially inward and outward directions of the rotational shaft. A slider shift mechanism provided on the stationary ring and the rotatable ring brings each slide plate into and out of engagement with the coupling portions in step with a rotational movement of the rotatable ring. Thus, for locking the rotational shaft in a fixed state, an operator grips and turns the rotatable ring with one hand to engage the slide plates with the coupling portions by the slider shift mechanism. In this state, a rotary atomizing head can be mounted on or dismantled from the rotational shaft.

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First Claim