Knock type mechanical pencil with retractable eraser

Details Knock type mechanical pencil with retractable eraser Knock type mechanical pencil with retractable eraser

1991-05-06

1993-05-04

DeMille, Danton D.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Combined

401 19, 401 32, 401 78, 15431, B43K 2902

Patent

active

052075222

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: 364916 (1887-06-01), Goldsmith
patent: 1372354 (1921-03-01), Keeran
patent: 1461437 (1923-07-01), Billman
patent: 2173361 (1939-09-01), Gorrell
patent: 2198335 (1940-04-01), Gaimari
patent: 2204038 (1940-06-01), Findra
patent: 2287794 (1942-06-01), Lynn
patent: 2293993 (1942-08-01), Lynn
patent: 2525229 (1950-10-01), Lynn
patent: 2532037 (1950-11-01), Robbins
patent: 4352580 (1982-10-01), Ando
patent: 4386865 (1983-06-01), Kageyama
patent: 4904101 (1990-02-01), Petterson

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