Mechanical pencil

Details Mechanical pencil Mechanical pencil

2008-12-18

2010-12-14

Walczak, David J (Department: 3751)

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including holder

C401S092000, C401S074000

Reexamination Certificate

active

07850381

ABSTRACT:
A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable together in a direction of rotation and an axial direction within a body cylinder (1). A rotational drive mechanism for the writing lead is formed such that first and second cam faces (6a) and (6b) 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 (13a) and (14a) are arranged on the body cylinder side to face the above-mentioned first and second cam faces respectively. Retreat operation and forward movement (cushion action) of the writing lead by writing pressure are provided with a damping effect by sticky grease (19) interposed between a stopper (16) and a torque canceller (17). As a result, a sense of uncomforting, when writing, generated in conjunction with the cushion action can be reduced.

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International Search Report of PCT/JP2008/073048, Mailing Date of Jan. 20, 2009.

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