Writing instrument

Details Writing instrument Writing instrument

2007-04-24

2007-04-24

Nguyen, Tuan (Department: 3751)

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

C401S082000, C401S093000, C401S094000, C401S115000

Reexamination Certificate

active

11477850

ABSTRACT:
A writing instrument is capable of functioning both as an automatic mechanical pencil and as a shaking-type mechanical pencil. The writing instrument has a barrel cylinder constituted by a front cylinder detachably connected to a rear cylinder. A slider is disposed at the front end of the barrel cylinder, and a lead chuck, such as a ball chuck, is disposed rearwardly of the slider. A slider spring urges the slider forward and urges the lead chuck rearward. A lead reservoir is movably disposed rearwardly of the lead chuck. Around the outer periphery of the lead reservoir, a weight is disposed to undergo back-and-forth movement in an axial direction. On the outer periphery of the lead reservoir is disposed a weight-receiving cylinder against which the rear end of the weight abuts when the writing instrument is shaken. A knocking spring urges the weight-receiving cylinder forward and urges the lead reservoir rearward.

REFERENCES:
patent: 4205924 (1980-06-01), Sumita
patent: 5149219 (1992-09-01), Kageyama et al.
patent: 5171097 (1992-12-01), Nagaoka et al.
patent: 5354141 (1994-10-01), Watanabe
patent: 63191080 (1988-12-01), None

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