Patent ID: 7237972

Claim:
An automatic mechanical pencil comprising: a barrel cylinder having an inner stepped portion; a tubular piece removably connected to the barrel cylinder and having a tapered member and a connecting cylinder extending rearwardly from a rear portion of the tapered member, the connecting cylinder having an engagement hole; a slider for frictionally holding a lead and being movably disposed in a front portion of the tapered member to undergo movement in the axial direction of the barrel cylinder; a lead chuck for releasably holding the lead so as to allow forward movement of the lead but prevent backward movement thereof, the lead chuck being movably disposed to undergo movement in an axial direction of the barrel cylinder; a lead reservoir main body disposed in the barrel cylinder for supplying the lead to the lead chuck, the lead reservoir main body having an outer stepped portion for abutment with the inner stepped portion of the barrel cylinder; a pipe holder connected to the lead chuck and to a front end of the lead reservoir main body and having a guide projection; a stopper disposed around an outer periphery of the pipe holder, the stopper having a receiving groove engageable with the guide projection of the pipe holder and a connecting projection engageable with the engagement hole of the connecting cylinder; first urging means for urging the slider forward and the lead chuck backward so that when a writing front end of the automatic mechanical pencil is released from a writing surface, the lead is automatically fed by urging the slider forward; and second urging means for urging the lead reservoir main body and the stopper so that the lead reservoir main body and the stopper move relatively in the axial direction.