Patent ID: 8920057

Claim:
A mechanical pencil comprising a shaft cylinder, a lead pipe axially movably inserted into the shaft cylinder and biased in a retract direction, and a chuck body provided within the shaft cylinder in front of the lead pipe for gripping and releasing a writing lead, characterized in that: the lead pipe and the chuck body are separated, the lead pipe is axially movably inserted into the shaft cylinder, and the chuck body is positioned within the shaft cylinder in front of the lead pipe to be movable in an axial direction and rotatable about an axis, wherein a lead rotating mechanism is provided between a back part of the chuck body and a front part of the lead pipe, and wherein when the lead pipe is advanced by a knocking operation or retracted by the release of the knocking operation, when writing pressure is applied to the writing lead, and when the writing pressure is released, the lead rotating mechanism only rotates the chuck body, but does not transmit a rotational force to the lead pipe.