Patent ID: 7850381

Claim:
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 said 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 sticky medium is interposed between a movable member which moves together with said writing lead in an axial direction with application of the writing pressure of said writing lead and a stationary member facing a movable surface of said movable member so that said sticky medium provides retreat operation and forward movement of said writing lead with a damper function.