The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 2012
Filed:
Dec. 18, 2008
Norio Ohsawa, Yokohama, JP;
Takeo Fukumoto, Yokohama, JP;
Yoshitoshi Osano, Yokohama, JP;
Takeshi Kobayashi, Yokohama, JP;
Hirotake Izawa, Yokohama, JP;
Kyo Nakayama, Yokohama, JP;
Norio Ohsawa, Yokohama, JP;
Takeo Fukumoto, Yokohama, JP;
Yoshitoshi Osano, Yokohama, JP;
Takeshi Kobayashi, Yokohama, JP;
Hirotake Izawa, Yokohama, JP;
Kyo Nakayama, Yokohama, JP;
Mitsubishi Pencil Co., Ltd., Tokyo, JP;
Abstract
A writing lead () is grasped and released by reciprocation of a chuck () provided in a body cylinder () so as to inch the writing lead forward and a rotational drive mechanism is provided for rotationally driving a rotor () in one direction in conjunction with retreat operation by the writing pressure applied to the writing lead and forward movement by releasing the writing pressure. A pipe support member () for supporting a pipe end () is accommodated in a base (A) which constitutes a front end portion of the body cylinder, and a retreat drive mechanism is provided for gradually retreating the pipe support member into the body cylinder in conjunction with rotational drive operation of the rotor. With the above-mentioned structure, a pipe-slide type mechanical pencil can maintain an amount of projection of the writing lead from the pipe end within a certain range.