B - Operations – Transporting – 43 – K
Patent
B - Operations, Transporting
43
K
207/40
B43K 21/06 (2006.01) B43K 7/12 (2006.01) B43K 24/06 (2006.01)
Patent
CA 1207707
ASTRACT OF THE DISCLOSURE A two-part barrel sleeve includes an internal spring finger which rides in a spiral groove in the combi- ned ink reservoir and barrel of a ball pen, the spiral groove having a detent at its rear end to provide a snap- action as the barrel sleeve is retracted to its rearmost position exposing the writing tip for normal use. SPECIFICATION The present invention relates in general to writing instruments of the type in which a tubular shroud may be moved between a forward storage postion wherein it covers and protects the writing tip of the instrument, and a rearward retracted position wherein the writing tip is exposed for normal use. BACKGROUND OF THE INVENTION It is known in the prior art to threadedly mount a tubular barrel to a writing cartridge located within the barrel so that relative rotation between the writing car- tridge and the barrel results in axial displacement of the barrel relative to the cartridge. In that construction the writing tip may be shrouded by the barrel when the writing intrument is not being used. See, for example, U. S. patents 2,441,280 and 2,603,186 for a description of that type of writing instrument. Similarly, it is known to threadedly attach a short, tubular shroud sleeve to the barrel of a writing instrument for the same purpose. Although these prior art systems have functioned as intended, they have exhibited several characteristics
440805
Digney Jerry W.
Wacha Martin E.
Gowling Lafleur Henderson Llp
Parker Pen Company (the)
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