Patent ID: 7207738

Claim:
A writing instrument comprising: a barrel cylinder; a slider for frictionally holding a lead and being movably disposed at a front end of the barrel cylinder; a lead chuck disposed in the barrel cylinder rearwardly of the slider 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; first urging means for urging the slider forward and the lead chuck backward so that when a writing front end of the writing instrument is released from a writing surface, the lead is automatically fed by urging the slider forward; a lead reservoir disposed rearwardly of the lead chuck to supply the lead to the lead chuck; a weight movably disposed around the outer periphery of the lead reservoir to undergo movement in the axial direction so as to abut against the rear end of the lead chuck; a weight-receiving cylinder movably disposed on the outer periphery of the lead reservoir and against which the weight abuts; and second urging means for urging the weight-receiving cylinder forward.