Mechanical pencil
AssigneeKotobuki & Co., Ltd.
InventorsHidehei Kageyama, Yukimasa Kuwabara
Life of this patent
Estimating the term…
Abstract
A mechanical pencil wherein a slider 11 in contact with a lead and an outer tube 1 with different frictional resistances other than a lead delivery mechanism for effecting lead-feed by general knocking operation are provided within the outer tube 1 or a fore means 2, whereby the end of a consumed lead 19 is pressed against or released from a surface of paper or the like to thereby project the lead 19 from a lead guide 12 by an amount corresponding to backward movement of the slider 11. The lead-feeding may be easily accomplished merely by pressing operation without changing the grip of the outer tube 1.
Claims4
A mechanical pencil comprising an outer member including an outer tube and a fore means provided on said outer tube, a lead pipe axially movably encased in said outer tube, a lead chuck connected to said lead pipe, a chuck fastening ring for gripping the end of said lead chuck, a cushion sleeve having a stopper portion, said stopper portion being in abutment with said chuck fastening ring, and in engagement with an engaging hole in said outer member, a resilient member disposed between said cushion sleeve and said lead pipe, and a slider member inserted in said fore means and axially movable in a predetermined range with respect to said fore means, said slider member having an inner peripheral surface supporting a lead with a first predetermined frictional resistance, said slider member having an outer peripheral surface disposed in sliding contact with an inner peripheral surface of said fore means with a second frictional resistance greater than the first frictional resistance.
A lead feeding slider for a mechanical pencil comprising an axially movable slider means inserted into a fore means of said mechanical pencil, said slider means integrally provided with a resilient sliding contact member holding a lead with a first predetermined frictional resistance and a sliding member placed in sliding contact with the inner peripheral surface of the fore means in the outer peripheral surface thereof with a frictional resistance greater than the first frictional resistance.
Dependencies are inferred from the claim text.