The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 2001
Filed:
Jul. 27, 1999
Toshihiro Isobe, Tokyo, JP;
Norio Yamada, Tokyo, JP;
Pentel Kabushiki Kaisha, , JP;
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.