Patent ID: 8685509
Filing Date: 2014-04-01
Classification: B29C,B29L,B43K,Y10T

Abstract:
1. A method of manufacturing a casing for a writing instrument, comprising: using dual injection molding, forming an outer shaft that extends substantially the length of the casing, wherein one step of the injection molding forms a hard part of the outer shaft, and another step of the injection molding forms a soft part of the outer shaft, wherein the soft part includes one or more openings on the outer surface of the outer shaft that receive protrusions of the hard part at corresponding positions on the outer shaft; forming an inner shaft for insertion inside the outer shaft, wherein forming the inner shaft includes forming a fastener that protrudes from an upper end of the inner shaft and engages an upper end of the outer shaft when the inner shaft is inserted inside the outer shaft; and forming a nib that engages a lower end of the inner shaft and secures the inner shaft within the outer shaft.