Compound writing instrument
AssigneeZebra Co., Ltd.
InventorKazuhiko Sekiguchi
Life of this patent
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Abstract
A compound writing instrument, wherein a retractable mechanical pencil unit and a ball point pen unit are assembled in a lower barrel of the writing instrument, an upper barrel rotatable in one or two directions relative to said lower barrel around its axis overlaps said lower barrel and a cam mechanism engaging with said units for selectively shifting said units in the axial direction into a writing position is accomodated within said upper barrel of the writing instrument. By means of said cam mechanism, said upper barrel is shiftable relative to said lower barrel in the axial direction enough to feed out the lead of said mechanical pencil unit when this unit is in the writing position, while said upper barrel is non-shiftable relative to said lower barrel when said ball point pen unit is in the writing position.
Claims4
A compound writing instrument comprising a lower barrel accomodating a retractable mechanical pencil unit and a ball point pen unit;
- an upper barrel rotatable in one or both directions relative to said lower barrel around its axis and overlapping the upper portion of said lower barrel;
- a cam mechanism in said upper barrel including a curved casing engaging said units for selectively shifting said units in the axial direction into a writing position when said upper barrel is rotated, said cam mechanism permitting said upper barrel to shift relative to said lower barrel in the axial direction enough to feed out the lead in said mechanical pencil unit when this unit is in the writing position, while said upper barrel is made non-shiftable relative to said lower barrel when said ball point pen unit is in the writing position.
Dependencies are inferred from the claim text.