Conical Nib And Writing Instrument Using The Same
(57) Abstract
A nib piece with high roundness is obtained in the following manner: in the forming of the nib piece, a punched hole is formed in a base portion of a punched plate which is to be bent; the base portion of the punched plate is bent and shaped into a tubular structure; a pipe member which is aligned with and accommodated in the tubular body, is disposed in an inner portion of the base portion of the punched plate having been bent; and the punched plate is shaped to obtain a structure to wrap an outer periphery of the pipe member. The punched plate includes an engageable joint portion, such as a protrusion and a recess, which engage each other and form a hooked edge when the punched plate is bent into a cylindrical form.
The write-up is for Pro members
Pro members get the plain-English description, what the claims covered, the materials and manufacturing route, a demand check with real listings and prices, and any related-patent warnings for every pick, every week.