Ballpoint pen refill and ballpoint pen
AssigneeMitsubishi Pencil Company, Limited
InventorYuichiro Homma
Life of this patent
Estimating the term…
Abstract
Provided is a ballpoint pen refill including: an ink storage tube made of a synthetic resin and storing an ink thereinside; a ball holder made of a synthetic resin and attached to a distal end of the ink storage tube; a ball pressing rod mounted inside the ball holder; and a writing ball stored in a distal end of the ball holder and having a rear end side held by the ball pressing rod, in which the ball pressing rod includes: a fixing portion fixed to the ball holder; a movable portion slidable in a front-rear direction with respect to the ball holder; a compression portion connecting the fixing portion and the movable portion; and a rearward movement restricting portion protruding from a distal end of the fixing portion and provided with a gap from a rear end of the compression portion.
Claims11
A ballpoint pen refill comprising:
- an ink storage tube made of a synthetic resin and storing an ink thereinside;
- a ball holder made of a synthetic resin and attached to a distal end of the ink storage tube;
- a ball pressing rod mounted inside the ball holder;
- and
- a writing ball stored in a distal end of the ball holder and having a rear end side held by the ball pressing rod,
- wherein the ball pressing rod includes:
- a fixing portion fixed to the ball holder;
- a movable portion slidable in a front-rear direction with respect to the ball holder;
- a compression portion connecting the fixing portion and the movable portion;
- and
- a rearward movement restricting portion protruding from a distal end of the fixing portion;
- and
- a gap between a distal end of the rearward movement restricting portion and a rear end of the movable portion.
Dependencies are inferred from the claim text.