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:
Feb. 02, 2010
Filed:
Jun. 01, 2007
Hirotake Izawa, Yokohama, JP;
Takeo Fukumoto, Yokohama, JP;
Norio Ohsawa, Yokohama, JP;
Kyo Nakayama, Yokohama, JP;
Yoshitoshi Osano, Yokohama, JP;
Hirotake Izawa, Yokohama, JP;
Takeo Fukumoto, Yokohama, JP;
Norio Ohsawa, Yokohama, JP;
Kyo Nakayama, Yokohama, JP;
Yoshitoshi Osano, Yokohama, JP;
Mitsubishi Pencil Co., Ltd., Tokyo, JP;
Abstract
A chuck unit () for grasping a writing lead () and a rotor () arranged to be movable in a direction of rotation and an axial direction within a body cylinder () are provided. First and second cam faces () and () are respectively formed at one end face and another end face of the rotor in the axial direction, and first and second fixed cam faces () and () are arranged on the body cylinder side to face the first and second cam faces respectively. The first cam face in the rotor is brought into abutment with and meshed with the first fixed cam face by retreat operation of the chuck unit under writing pressure, and the second cam face in the rotor is brought into abutment with and meshed with the second fixed cam face by releasing the writing pressure, so that the rotor rotates, whereby the writing lead also rotates.