Automatic mechanical pencil and method of assembly thereof

Details Automatic mechanical pencil and method of assembly thereof Automatic mechanical pencil and method of assembly thereof

2007-07-03

2007-07-03

Le, Huyen (Department: 3751)

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including holder

Reexamination Certificate

active

11477851

ABSTRACT:
An automatic mechanical pencil has a tubular piece removably connected to a barrel cylinder, and a slider for frictionally holding a lead and being movably disposed in a front portion of the tubular piece. A lead chuck is disposed in the barrel cylinder for releasably holding the lead so as to allow forward movement of the lead but prevent backward movement thereof. A first spring urges the slider forward and the lead chuck backward so that when a writing front end of the writing instrument is released from a writing surface, the lead is automatically fed by urging the slider forward. A lead reservoir is disposed rearwardly of the lead chuck to supply the lead to the lead chuck. The lead reservoir has a reservoir main body, a pipe holder connected to a front end of the reservoir main body and having a guide projection, and a stopper disposed around an outer periphery of the pipe holder and having a receiving groove engageable with the guide projection. A second spring urges the reservoir main body and the stopper of the lead reservoir so that the reservoir main body and the stopper move relatively in the axial direction of the barrel cylinder.

REFERENCES:
patent: 3947133 (1976-03-01), Kageyama et al.
patent: 4538934 (1985-09-01), Brunner
patent: 6254296 (2001-07-01), Sheu
patent: 6218296 (1993-07-01), None

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