Mechanical pencil with self-contained insert

Details Mechanical pencil with self-contained insert Mechanical pencil with self-contained insert

1983-06-03

1985-10-01

Bratlie, Steven A.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 67, 401 94, 401110, B43K 2408, B43K 2122

Patent

active

045442959

ABSTRACT:
A mechanical pencil comprising a pencil barrel, a cam cylinder mounted in the pencil barrel at a front portion thereof and having a cam wall formed on an inner circumferential surface, a cylindrical slide cam engaged with the cam wall for back-and-forth movement therein, a rotatable cam disposed in front of the slide cam and having a central hole, an inner fitting and a clamp support connected together and disposed in front of the rotatable cam, a pusher for pushing the slide cam, a spring for urging the inner fitting and the clamp support to move backwardly, the inner fitting, a lead holder mounted in the inner fitting for holding a lead with a light force, a cylindrical clamp disposed behind the lead holder and movable back and forth by a slight interval, a chuck fitted in the clamp, a lead pipe connected to a rear end of the chuck and having a diameter small enough to allow passage therethrough of one lead at a time, the lead pipe extending through the rotatable cam and the slide cam, a lead casing connected to a rear end of the lead pipe, another spring for urging the interconnected chuck, lead pipe and lead casing to move backwardly, and a stop portion for preventing the chuck, the lead pipe and the lead casing from being retracted beyond a certain interval.

REFERENCES:
patent: 387042 (1888-07-01), Bohren
patent: 3192904 (1965-07-01), Johmann
patent: 3724960 (1973-04-01), Hashimoto et al.
patent: 3765781 (1973-10-01), Hashimoto et al.
patent: 4106874 (1978-08-01), Torii

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