Writing tool

Details Writing tool Writing tool

1994-06-23

1997-11-04

Yu, Mickey

Coating implements with material supply

Solid material for rubbing contact or support therefor

Combined

401 78, B43K 2500, B43K 2108

Patent

active

056831919

ABSTRACT:
This invention is to a writing tool such as mechanical pencil or a ballpoint pen in which a writing shaft having a head member is inserted in an outer sleeve in such a manner that the head member projects from the outer sleeve. A stair or step and a spiral groove are provided on the forward inner surface and the rearward inner surface of a tubular cap, respectively, with an inside diameter of the rear part of the spiral groove being larger. A bearing part is brought into contact with a lead tank provided inside a forward art of the tubular part so that the forward part of the outer sleeve is movable in the axial direction and is locked in the turning direction against a rearward inner surface of the outer sleeve. The rearward part of the tubular body is provided with a slit, holding pieces of a stick-shaped object holder slidably inserted in said slit. A stick-shaped object is held by the holding pieces, and the projection is provided on each holder engaged with the spiral groove of the tubular cap.

REFERENCES:
patent: 3232275 (1966-02-01), Ziegler
patent: 4505607 (1985-03-01), Sugiyama
patent: 5022774 (1991-06-01), Kageyama et al.
patent: 5062727 (1991-11-01), Kageyama et al.

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