Mechanical pencil

Details Mechanical pencil Mechanical pencil

1996-01-11

1998-10-27

Muir, D. Neal

Coating implements with material supply

Solid material for rubbing contact or support therefor

Cushioned tool

401 65, 401 24, B43K 2102, B43K 2116, B43K 2122

Patent

active

058269991

ABSTRACT:
A mechanical pencil providing a cushioning action by the action of a sleeve disposed inside of an outer barrel. The mechanical pencil comprises an outer barrel, and a lead pipe disposed inside the outer barrel. The lead pipe has a chuck mounted in the end thereof. The pencil further comprises a chuck ring mounted on the outside of the chuck, a sleeve contacting a rear end of the chuck ring slidable relative to the outer barrel, and a spring interposed between the sleeve and the lead pipe. The sleeve has a plurality of flexible pieces that spread outwardly in a radial direction. A part of each flexible piece 24a is inserted into a stopper hole formed on an inner wall of the outer barrel. An inclined portion contacting the rear end of the stopper hole is formed on an outer surface of each of the flexible pieces.

REFERENCES:
patent: 235122 (1880-12-01), Bowman
patent: 1427999 (1922-09-01), Bell
patent: 4171170 (1979-10-01), Kageyama et al.
patent: 4240759 (1980-12-01), Matsumoto et al.
patent: 4270870 (1981-06-01), Hashimoto et al.
patent: 4714365 (1987-12-01), Kageyama et al.
patent: 4904101 (1990-02-01), Petterson
patent: 5009533 (1991-04-01), Kageyama et al.
patent: 5354141 (1994-10-01), Watanabe
Abstract of EP-A-0 093 815 (Kotobuki & Co., Ltd.).
Abstract of EP-A-0 168 122 (Kotobuki & Co., Ltd.).
Abstract of EP-A-0 154 073 (Kotobuki & Co., Ltd.).

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