Mechanical pencil

Details Mechanical pencil Mechanical pencil

1990-05-29

1991-04-02

Johnson, Richard J.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to limit tool projection

401 67, 401103, B43K 2122

Patent

active

050043625

ABSTRACT:
A mechanical pencil which employs the concept of inverting the configuration of a conventional mechanical pencil by designating the depressible end as the writing end and the stationary end as the eraser and thereby providing the convenience of advancing the lead as required without interrupting the writing process and requiring slightly more than the effort of dotting the letter "i" or adding a period at the end of a sentence.
Such a mechanical pencil is provided with a simple and unique lead-advancing device comprising of a plurality of equally opposing pivotally fastened spring loaded spring clip mechanisms which, when activated by quickly applying and releasing slightly greater than normal writing pressure once to the depressible end against a writing surface, are caused to simultaneously lift away from the lead, extend and regrasp the lead at a higher position then pull the lead to advance it to a predetermined length, suitable for writing with, during the contraction of the mechanisms to their rest position.

REFERENCES:
patent: 1737862 (1929-12-01), Morris
patent: 1745658 (1930-02-01), Becker
patent: 2469411 (1949-05-01), Robbins
patent: 2865330 (1958-12-01), Swank
patent: 3514211 (1970-05-01), Hashimoto

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