Patent ID: 7850380
Filing Date: 2010-12-14
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 said writing lead is inched forward by transmitting knock operation of a knock part to said chuck through a lead storage disposed at a rear end side of said chuck, and a separation part is formed at any location along a knock operation transmitting path between said knock part and said chuck so as to transmit the knock operation of said knock part to said chuck and inhibit rotation operation from being transmitted.