Retractile pen
OwnerMing-Jen Hsieninventor
Life of this patent
Estimating the term…
Abstract
A retractile pen includes an outer barrel and an inner barrel axially slidably received in the outer barrel. The outer barrel is provided with two axially spaced and aligned stop holes and the inner barrel is provided with an elastically depressible button adapted to partially project from either of the stop holes. By engaging the button on the inner barrel with a different stop hole on the outer barrel, the pen can be adjusted to either a longer length to facilitate writing with the pen or a shorter length to facilitate convenient carrying of the pen.
Claims1
A retractile pen comprising an outer barrel and an inner barrel axially slidably received in said outer barrel;
- said outer barrel having a diametrically reduced front open end that allows said inner barrel to smoothly slide forward and outward in and relative to said outer barrel without completely separating from said outer barrel;
- said outer barrel having a sectioned outer profile of any shape and a sectioned inner profile including at least two diametrically opposite plane surfaces;
- said outer barrel being provided at one side corresponding to one of said plane surfaces with two axially spaced but aligned through holes, namely, a front stop hole and a rear stop hole;
- and
- said inner barrel including a longer round tube portion in which an ink cartridge is received and a shorter square guide block portion extended from a rear end of said round tube portion;
- said guide block portion having dimensions corresponding to that of said sectioned inner profile of said outer barrel, particularly to said plane surfaces, for guiding said inner barrel to axially stably slide in said outer barrel;
- said guide block portion being provided at one side corresponding to said plane surface of said outer barrel having said stop holes with a recess that has a predetermined depth such that a first spring and a button in front of said first spring are inward depressibly received in said recess, whereby when said recess is aligned with any one of said stop holes, said button is pushed forward by said first spring to project a front portion from said stop hole and thereby hold said inner barrel in place in said outer barrel;
- and a second spring being disposed in said outer barrel behind a rear end of said guide block portion and a head cap being fitted to close a rear end of said outer barrel and seal said second spring between the rear end of said outer barrel and the rear end of said inner barrel, so that said second spring normally pushes said inner barrel forward;
- whereby when said inner barrel is forwardly pushed by said second spring with said button aligned with and projected from said front stop hole, said retractile pen has an extended length, and when said inner barrel is forwardly pushed by said second spring with said button aligned with and projected from said rear stop hole, said retractile pen has a shortened length.
Dependencies are inferred from the claim text.