Writing instrument
AssigneeKotobuki & Co., Ltd.
InventorsTakeshi Wakayama, Yoshio Noguchi, Hidehei Kageyama
Life of this patent
Estimating the term…
Abstract
A writing instrument according to an embodiment of the invention including, a chuck that chucks a writing lead, wherein the chuck includes a first chuck pawl which comes into point contact or line contact with the writing lead to press the writing lead so as to apply first contact stress to the writing lead; and a second chuck pawl which presses the writing lead so as to apply, to the writing lead, second contact stress that is lower than the first contact stress, and the first contact stress is configured such that, when a prescribed impact is applied to the writing lead, a contact portion of the writing lead subjected to the first contact stress fractures and absorbs the prescribed impact.
Claims14
A writing instrument adapted to be used with a writing lead, the writing instrument including:
- a chuck configured to sandwich and to chuck the writing lead for the writing instrument, wherein
- the chuck includes:
- a first chuck pawl which comes into point contact or line contact with the writing lead for the writing instrument to press the writing lead for the writing instrument so as to apply first contact stress to the writing lead for the writing instrument;
- and
- a second chuck pawl which presses the writing lead for the writing instrument so as to apply, to the writing lead for the writing instrument, second contact stress that is lower than the first contact stress, and
- the first contact stress applied by the first chuck pawl to the writing lead for the writing instrument is configured such that, when a prescribed impact is applied to the writing lead for the writing instrument, a contact portion of the writing lead for the writing instrument subjected to the first contact stress fractures and absorbs the prescribed impact.
Dependencies are inferred from the claim text.