Mechanical pencil

Abstract

A mechanical pencil comprises a shaft cylinder (1), a lead pipe (3) axially movably inserted into the shaft cylinder (1) and biased in a retract direction, and a chuck body (45) provided within the shaft cylinder (1) in front of the lead pipe (3) for releasably griping a writing lead (S). The lead pipe (3) and the chuck body (45) are separated, the lead pipe (3) is inserted into the shaft cylinder (1) with axial movement thereof being permitted and circumferential rotation thereof being restricted, and the chuck body (45) is positioned within the shaft cylinder (1) in front of the lead pipe (3) so as to be movable in an axial direction and circumferentially rotatable. A lead rotation mechanism (5) is provided between a back part of the chuck body (45) and a front part of the lead pipe (3). When the lead pipe (3) is advanced by a knocking operation or retracted by the release of the knocking operation, when writing pressure is applied to the writing lead (S), and when the writing pressure is released, the lead rotating mechanism (5) rotates the chuck body (45), but does not transmit the rotation force to the lead pipe (3).

Dependencies are inferred from the claim text.