Patent ID: 7077593
Filing Date: 2006-07-18
Classification: B43K

Abstract:
1. A writing instrument comprising: an ink storing chamber formed inside a main body of the writing instrument; a writing element provided on a front end of the main body of the writing instrument; a reservoir chamber which is formed between the ink storing chamber and the writing element and communicates with the atmosphere; a partition wall that divides the reservoir chamber and the ink storing chamber with a through hole formed in a central portion of the wall; and an elongated ink supply member which has an outer circumference with a predetermined gap kept between the circumference and an inner wall of the through hole when the member is inserted into the through hole, and supplies ink inside the ink storing chamber to the writing element, wherein the inner wall of the through hole into which the ink supply member is inserted with the predetermined gap kept has two or more contact portions which come into contact the outer circumference of the ink supply member, and wherein the ink supply member has a circular cross section, and the through hole is a polygon or an ellipse with which the outer circumference of the ink supply member comes into contact at predetermined intervals.