Mechanical pencil

Details Mechanical pencil Mechanical pencil

1989-04-14

1990-09-18

Johnson, Richard J.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 67, B43K 2408, B43K 2116

Patent

active

049573845

ABSTRACT:
A mechanical pencil in which a lead guide pipe may protect a lead in a range from a lead chuck to the tip member or an extremity end of the slider by the tip member or the slider or the projection bar as well as the lead guide pipe so as to protect the lead and to prevent a breakage of the lead and a clogging of broken lead.

REFERENCES:
patent: 1700246 (1929-01-01), Woelm
patent: 1803794 (1931-05-01), Deutsch
patent: 2056143 (1936-09-01), Robbins
patent: 2210845 (1940-08-01), Wahl
patent: 2222295 (1940-11-01), Kanner
patent: 3664753 (1972-05-01), Minagawa
patent: 4544295 (1985-10-01), Hashimoto

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