Importance

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Abstract

A male coupling member is configured such that, even if a front end surface of a valve member is hit with a hammer, the valve member cannot bite into an opening surface of a coupling body. The male coupling member has a coupling body, a valve member, and a spring member. The valve member has a front end portion fitted into a front end opening of the coupling body, and a valve body. The front end portion has a circular front end surface, a front end annular surface having a smaller diameter than an opening surface of the coupling body, and a reduced-diameter surface having a smaller diameter than the front end annular surface. The reduced-diameter surface is configured such that when the valve member is tilted and, consequently, the reduced-diameter surface engages a rear end edge of the opening surface, the length b from the point of engagement between the reduced-diameter surface and the rear end edge to the outer peripheral edge of the front end surface of the valve member through the axis of the valve member is not larger than the diameter a of the front end surface.

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First Claim