A side-knock type mechanical pencil comprising a body with a side-mounted knock button coupled to the body of the mechanical pencil and adapted to slidingly engage with a lead tube with a frustoconical hub for translating the motion of the knock button actuation to linear extension of the lead.

A mechanical pencil includes a ball chuck, 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 vertical to the axial direction and an axial direction step part, and 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, 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.

A mechanical pencil includes a ball chuck, 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 vertical to the axial direction and an axial direction step part, and 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, 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.

A mechanical pencil unit is provided which includes: a holding tube; a holder which is inserted into a front side opening portion of the holding tube and which protrudes forward from a front end of the holding tube, and moreover which is supported so as to be back and forth movable relative to the holding tube; a pencil lead delivering mechanism which delivers forward a pencil lead x inserted into the holder; and a movement direction conversion mechanism which causes the holder to go forward relative to the holding tube and the pencil lead x by using a force applied in a radial direction from the pencil lead x to the holder, wherein the pencil lead delivering mechanism is provided at a position further toward a rearward side than the holder and the movement direction conversion mechanism.

A mechanical pencil unit is provided which includes: a holding tube; a holder which is inserted into a front side opening portion of the holding tube and which protrudes forward from a front end of the holding tube, and moreover which is supported so as to be back and forth movable relative to the holding tube; a pencil lead delivering mechanism which delivers forward a pencil lead x inserted into the holder; and a movement direction conversion mechanism which causes the holder to go forward relative to the holding tube and the pencil lead x by using a force applied in a radial direction from the pencil lead x to the holder, wherein the pencil lead delivering mechanism is provided at a position further toward a rearward side than the holder and the movement direction conversion mechanism.

A mechanical pencil includes a clamping claw for playing a coordination role in lead output. An abutting member is arranged in front of the clamping claw. The rear end, corresponding to the clamping claw, of the abutting member is provided with an abutting portion. The abutting portion includes a first through hole allowing a lead to move through. The abutting portion can be inserted into the clamping claw in a case where the clamping claw moves forward and simultaneously drives the clamping claw to open outwardly. The mechanical pencil has a better lead output effect.

A mechanical pencil includes a clamping claw for playing a coordination role in lead output. An abutting member is arranged in front of the clamping claw. The rear end, corresponding to the clamping claw, of the abutting member is provided with an abutting portion. The abutting portion includes a first through hole allowing a lead to move through. The abutting portion can be inserted into the clamping claw in a case where the clamping claw moves forward and simultaneously drives the clamping claw to open outwardly. The mechanical pencil has a better lead output effect.

A mechanical pencil according to an embodiment includes a barrel; a chuck mechanism that is housed inside the barrel and is capable of chucking and feeding out a writing lead for a mechanical pencil; and first and second cushion springs that elastically support the chuck mechanism in an axial direction with respect to the barrel, wherein a first cushioning region having a first spring constant and a second cushioning region having a second spring constant are formed by combining the first and second cushion springs, and the first and second cushioning regions are connected with no skipping.

A mechanical pencil according to an embodiment includes a barrel; a chuck mechanism that is housed inside the barrel and is capable of chucking and feeding out a writing lead for a mechanical pencil; and first and second cushion springs that elastically support the chuck mechanism in an axial direction with respect to the barrel, wherein a first cushioning region having a first spring constant and a second cushioning region having a second spring constant are formed by combining the first and second cushion springs, and the first and second cushioning regions are connected with no skipping.

A mechanical pencil including: a body cylinder; a lead releasing unit configured to release a writing lead and having a rear region supported inside the body cylinder such that a front region thereof is flexurally deformable or tiltable inside the body cylinder; and a stretchable elastic body arranged between the lead releasing unit and a body cylinder, in which the lead releasing unit has a pressed portion on an outer circumferential surface of the front region, the body cylinder has a pressing portion in a front region, the pressing portion and the pressed portion abut on each other before the front region of the lead releasing unit is flexurally deformed or tilted, and the pressing portion causes the pressed portion to relatively move to the rear side with respect to the body cylinder when the front region of the lead releasing unit is flexurally deformed or tilted.