Pencil with buffering effect for preventing a pencil lead...

Details Pencil with buffering effect for preventing a pencil lead... Pencil with buffering effect for preventing a pencil lead...

2006-07-25

2006-07-25

Nguyen, Tuan (Department: 3751)

Coating implements with material supply

Solid material for rubbing contact or support therefor

Cushioned tool

C401S065000, C401S067000

Reexamination Certificate

active

07080950

ABSTRACT:
A pencil with buffering effect for prevent a pencil lead from breaking comprises a head tube; a stepped element installed within the head tube and resisting against a front end of the spring; a spring; the spring having two sections, a front section and a rear section; the front section being denser than the rear section; a positioning tube; a plug resisting against the positioning tube; an inner tube enclosed by the spring and a rear end of the spring being in contact with the positioning tube; the inner tube passing through the positioning tube; a distal end of the inner tube being connected to a plug; a sleeve enclosing the inner tube and the positioning tube; the sleeve being connected to the head tube; and a pencil lead received within the stepped element.

REFERENCES:
patent: 4171170 (1979-10-01), Kageyama et al.
patent: 4343558 (1982-08-01), Fujiwara
patent: 5149219 (1992-09-01), Kageyama et al.

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