Importance

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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.

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First Claim