Capless writing instrument,申请号US20050524890-传众专利搜索

Capless writing instrument

申请公布号：US7101102(B2)

申请号：US20050524890

申请日期：2005.02.16

申请公布日期：2006.09.05

申请人：

MITSUBISHI PENCIL CO., LTD.

发明人：SAWA YUKINORI

分类号：B43K5/16;B43K5/17;B43K8/02;B43K8/24;B43K24/08

主分类号：B43K5/16

摘要：A capless writing instrument ( 1 ), wherein a writing element ( 5 ) is arranged inside a barrel cylinder ( 2 ) so that a pen point ( 6 ) of the writing element ( 5 ) can come out and retract through a front end opening of the barrel cylinder ( 2 ), is characterized in that an inner cap ( 20 ) formed of rubber or elastic resin is provided at the front end opening of the barrel cylinder ( 2 ), and the inner cap ( 20 ) is composed of: a closing portion ( 21 ) disposed on the pen point projecting side with respect to the axial direction of the barrel cylinder for closing the front end opening and having a slit ( 25 ) for allowing the pen point ( 6 ) to project and retract; and forward projected portions ( 27 ) that are projected from the outer periphery of the closing portion ( 21 ) toward the front end opening, and the inner cap is fitted inside the barrel cylinder so that, in the slit ( 25 ) closed state, force which is directed approximately perpendicular to the slit surfaces will act inward from the outer periphery of the forward projected portions ( 27 ).