Patent ID: 7806615
Filing Date: 2010-10-05
Classification: B43K

Abstract:
1. A mechanical pencil arranged to grasp and release a writing lead by reciprocation of a chuck provided in a body cylinder so as to inch said writing lead forward, in which said chuck is held within said body cylinder so as to be rotatable about an axis in a situation where the chuck grasps said writing lead, a rotational drive mechanism is provided where a rotor is retreated and moved forward by writing pressure of said writing lead through said chuck so that said rotor is rotationally driven, and rotational motion of said rotor is transmitted to said writing lead through said chuck, characterized in that a pipe end for guiding said writing lead and arranged to project from a base at a front end portion of said body cylinder is arranged to interlock with the retreat and forward movement of said chuck so as to move in the same direction, and arranged such that relative movement in an axial direction may not be generated between said pipe end and said writing lead in conjunction with the retreat and forward movement of said chuck.