To provide an oxygen enrichment apparatus wherein rotation adjustment of an adjust ring can be certainly and efficiently performed.
This oxygen enrichment apparatus includes an oxygen enrichment means (not illustrated) to generate oxygen enriched air with high oxygen concentration, a discharging body 21 which is connected to the oxygen enrichment means and discharges the oxygen enriched air, an adjust ring 44 which is rotatably disposed at the discharging body 21 and adjusts the discharging gas volume of the oxygen enriched air, recesses 62e which are disposed at an inner wall of the adjust ring 44 with prescribed intervals, and a ball 43c which is reinforced by a spring 43d to be pressed to the recess 62e, wherein an extended diameter section 43f is disposed at an upper part of a storing section 43e of the spring 43d and a moving range of the ball 43c becomes large to intensify the repulsive power of the spring 43d so that a strong clicking feeling can be felt when the ball 43c is engaged in the recess 62e and the rotation adjustment of the adjust ring 44 can thereby be certainly and efficiently performed.
TAKAHASHI MASAKI
YOSHIDA TOSHIYUKI
MORI HIROSHI
Tomoyasu Sakaguchi
Hiroki Naito
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