Patent ID: 7284927

Claim:
A writing instrument comprising: an outer barrel; a lead feeding mechanism disposed in the outer barrel for feeding lead from a front end of the outer barrel, said lead feeding mechanism comprising: a lead tank for housing leads, which is formed with a female thread on an inner peripheral surface thereof, said lead tank being incapable of rotating relative to the outer barrel; and a lead chuck fixed to a tip end of said lead tank for clamping and feeding a lead; a stick-shaped material propelling mechanism connected to a rear portion of the lead feeding mechanism, said stick-shaped material propelling mechanism comprising: a rear barrel rotatably connected to said lead tank of the lead feeding mechanism; and a stick-shaped material bearer for holding a stick-shaped material, the stick-shaped material bearer being unrotatable and slidable in an axial direction relative to the rear barrel, and integrally formed with a male thread which is screwed into the female thread of the lead tank of the lead feeding mechanism.