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:
Apr. 05, 2016
Filed:
Apr. 02, 2012
Hirotake Izawa, Yokohama, JP;
Takeshi Kobayashi, Yokohama, JP;
Kyo Nakayama, Yokohama, JP;
MITSUBISHI PENCIL CO., LTD., Tokyo, JP;
Abstract
A mechanical pencil having a rotational drive mechanism which gradually rotates a writing lead on application of writing pressure and allowing rotational operation of the writing lead to be known reliably. First and second cam facesandare respectively formed at one end face and the other end face of a rotorin an axial direction, and first and second fixed cam facesandarranged on the body cylinder side so as to respectively face the first and the second cam faces are provided to form the rotational drive mechanism for the writing lead. A plurality of groovesin the axial direction are formed at a sliderof a pipe endwhich projects forwardly from a body cylinder. Therefore, the user can see the grooves(provided for the slider) rotated by rotation of the rotor