| 摘要 |
PURPOSE: An air leakage preventive coupling is provided to prevent the leakage of air by inserting a dual ball of a bearing in the combining end of an air supply line into two ball grooves around the rear end of an air tool for stronger combining force. CONSTITUTION: A coupling(10) contains a bearing(24) having more than two balls in a combining end(20) of an air supply line(18) and more than two ball grooves(26) in which the balls are inserted into around an air tool(14). The end of the air tool is curvedly slit to roll the rear ball of the bearing. Thus, the rear side of the air tool is stuck to a cylinder(22) to supply air to the air tool. When not in use, the air tool is separated from the cylinder by inserting the front ball into the rear groove and putting the rear ball on the slit portion.
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