Coating implements with material supply – Solid material for rubbing contact or support therefor – Including means to advance material
Patent
1975-12-18
1977-01-18
Charles, Lawrence
Coating implements with material supply
Solid material for rubbing contact or support therefor
Including means to advance material
B43K 2116
Patent
active
040036642
ABSTRACT:
A mechanical pencil, especially for thin leads, in which a tubular guide projects from and is guided for movement in axial direction in one end of a tubular casing. Lead is automatically advanced through the casing as a function of pressure exerted on the tubular guide during writing or drawing by successively compressing and expanding a tubular, resilient element having a conically-shaped end. During writing or drawing, the resilient element is compressed and its conically shaped end is wedged in tight engagement into a cooperating conically shaped end of an abutment member so as to clamp lead passing through the casing, thereby preventing the lead from moving inwardly during writing. When pressure is terminated, the resilient element is restored to its expanded condition, thereby freeing the lead to advance.
REFERENCES:
patent: 1745658 (1930-02-01), Becker
patent: 2026815 (1936-01-01), Barker
patent: 2865330 (1958-12-01), Swank
patent: 3424535 (1969-01-01), Schischkow
patent: 3864046 (1975-02-01), Butka
Charles Lawrence
Striker Michael J.
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