Importance

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Abstract

A knock type applicator includes a cylindrical shell having a coating liquid storage chamber, a writing tip slidably inserted into an opening portion formed in a distal end of the cylindrical shell, and a valve mechanism between the writing tip and the coating liquid storage chamber. The valve mechanism has a valve element connected to the writing tip. Ribs are formed in an inner wall of the opening portion of the cylindrical shell in a lengthwise direction of the cylindrical shell. The diameter of an inscribed circle connecting apexes of the ribs is dimensioned smaller than the maximum diameter of the writing tip. By this, the ribs bite or project into the writing tip which is advanced in combination with the valve element during knocking operation. As a consequence, the writing tip is cracked by the ribs projected therein. At that time, hardened substance, gelled substance and viscous substance created from the coating liquid in the writing tip are peeled off from the fibers of the writing tip, thus recovering an ink flow passage in the writing tip. A connecting force between the writing tip and the valve element is set smaller than a biasing force exerted to the valve element, and a joining distance between the writing tip and the valve element is set longer than a moving distance of the valve element during knocking operation. Thus, the writing tip would not escape from the valve element even if the knocking force is released by mistake when the hardened substance, gelled substance, etc. of the coating liquid is removed from the writing tip.

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First Claim