Automatic mechanical pencil

Details Automatic mechanical pencil Automatic mechanical pencil

1990-01-18

1993-08-17

Bratlie, Steven A.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 81, 401 94, B43K 21033, B43K 2122

Patent

active

052362710

ABSTRACT:
An automatic pencil for automatically dispensing a writing lead comprises a hollow, longitudinal main body for receiving therein lead, and a mouthpiece detachably connected at its rear end to a front end of the main body for projecting a top of the lead received in the main body from a front end of the mouthpiece. A slider is movably disposed in a front portion of the mouthpiece for frictionally holding therein the lead, the slider being manually, reciprocally moveable in the axial direction of the pencil in response to writing pressure applied thereto during use of the pencil. A chuck is mounted in a rear portion of the mouthpiece for releasably clamping the lead during use of the pencil such that the chuck operates in response to the reciprocating movement of the slider to allow advancing movement of the lead toward the front end of the mouthpiece and to prevent retracting movement of the lead. To facilitate replacement of the lead, the chuck is removable from the main body together with the slider when the mouthpiece is detached from the main body.

REFERENCES:
patent: 271439 (1883-01-01), Eybel
patent: 2340665 (1944-02-01), Jacobs
patent: 3804536 (1974-04-01), Torii et al.
patent: 3864046 (1975-02-01), Butka
patent: 3883253 (1975-05-01), Naruse et al.
patent: 4003664 (1977-01-01), Butka
patent: 4230413 (1980-10-01), Gartner
patent: 4270870 (1981-06-01), Hashimoto et al.
patent: 4478529 (1984-10-01), Morio
patent: 4538934 (1985-09-01), Brunner

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