PURPOSE: To detachably mount a nozzle member by one touch by pressing several steel balls pressed to tapered holes engaged, within grooves formed near the end of a vacuum rod by an elastic element.
CONSTITUTION: A nozzle member 11 is inserted into a vacuum rod 12, steel balls 13 are pressed into tapered holes 16 formed in the rod 12, and the part of the balls 13 is introduced into a recess 15 formed in the member 11. An O-ring 14 is engaged with the groove 17 formed on the rod 12 to press a plurality of the balls 13 from outside to the inside by the tension of the ring 14. Thus, the member 11 is normally held by the rod 12 via the balls 13 received by the pressing force toward the inside and restricted to rotate, but when the member 11 is applied by a strong downward tension, the balls 13 are externally discharged against the pressing force by the tension of the ring 14 by the oblique surface of the recess 15 formed on the member 11, removed from the recess 15, and the member 11 is drawn out from the rod 12.
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UCHIDA KANJI
SENO MASAYUKI
