Patent ID: 11884093
Assignee: MITSUBISHI PENCIL COMPANY, LIMITED
Field: Other consumer goods (Other fields)
Classification: CPC B | IPC B

Claim 5:
6. A mechanical pencil which comprises
a ball chuck allowing advance of the lead and preventing retraction,
a rotation drive mechanism having a rotary part and receiving an axial direction retraction operation due to writing pressure received by the lead held by the ball chuck and an axial direction advance operation due to release of the writing pressure to drive the rotary part to rotate in one direction,
a feed cam face having a ring-shaped cam face and an axial direction drop difference provided at the ring-shaped cam face,
a slider having an abutting part abutting against the feed cam face and a holding chuck holding a lead and rotating upon receiving a rotation drive force of the rotary part,
a ring-shaped or cylindrical first cam member, and
a ring-shaped or cylindrical second cam member arranged outside from the first cam member in the diametrical direction,
the first cam member and the second cam member cooperating to form the feed cam face, and
which is configured so that the lead held by the holding chuck is pulled out from the ball chuck due to the advance operation of the slider when the abutting part moves along the feed cam face according to rotation of the rotary part and the abutting part falls into the drop difference,
wherein the first cam member is formed with a first slanted surface, the second cam member is formed with a second slanted surface, and the first slanted surface and the second slanted surface cooperate to configure the feed cam face.