Patent ID: 7922411
Filing Date: 2011-04-12
Classification: B43K

Abstract:
1. An end plug mounting structure for writing instrument, comprising: a barrel having a cylindrical rear portion having a periphery defining a locking hole; an inserting portion with a circle cross section provided on said end plug, the inserting portion having a periphery inserted into said rear portion of the barrel from a rear end of the barrel; and a locking protrusion provided on the periphery of said inserting portion, said locking protrusion locked in said locking hole; said rear portion of the barrel further having an inner surface defining a groove extending forward from said rear end of the barrel, in which said locking protrusion moves, whereby said end plug is capable of being assembled on the barrel by means of locking said locking protrusion that moves forward in said groove in said locking hole; wherein said locking hole is configured to be adjacent to said groove, so that said locking protrusion moving forward in said groove moves along circumferential direction so as to be locked in said locking hole.