Writing instrument
AssigneeSanford, L.P.
InventorsVenkata Rajasekhar, Sivanpillai Murugan, Ramaswamy Kaleesvaran
Life of this patent
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Abstract
A writing tip assembly for dispensing a free-flowing low-viscosity ink from a writing instrument may include a micro-spring, a writing ball configured to transfer ink to a substrate, and a second ball between the writing ball and the micro-spring. The second ball is configured to transfer ink to the writing ball. A writing instrument for dispensing a free-flowing low-viscosity ink includes an ink reservoir, the writing tip assembly, and a feeder fluidically coupling the ink reservoir to the writing tip assembly.
Claims18
A writing tip assembly for dispensing a free-flowing low-viscosity ink from a writing instrument, the writing tip assembly comprising:
- a micro-spring,
- a tip body defining a lumen at least partially housing the micro-spring,
- a writing ball configured to transfer ink to a substrate, wherein at least 70% of the writing ball is covered by the tip body, and
- a second ball between the writing ball and the micro-spring, wherein the second ball is configured to transfer ink to the writing ball;
- wherein the micro-spring comprises a first spring portion adjacent the second ball, a second spring portion extending from the first spring portion, a third spring portion extending from the second spring portion, and a fourth spring portion extending from the third spring portion and extending beyond the lumen;
- wherein the second spring portion has a smaller diameter than that of the third spring portion, the third spring portion has a greater diameter than that of the second spring portion, and the fourth spring portion has a diameter equal to that of the second spring portion;
- and
- wherein the writing instrument comprises a feeder configured to provide ink from an ink reservoir to the writing tip assembly via contact between the feeder and fourth spring portion.
A writing instrument for dispensing a free-flowing low-viscosity ink, the writing instrument comprising:
- an ink reservoir;
- a writing tip assembly comprising:
- a tip body defining a lumen;
- and
- a micro-spring at least partially disposed within the lumen;
- a lamella extending from the writing tip assembly into the ink reservoir, the lamella comprising:
- a plurality of fins, wherein a larger fin is disposed at the bottom of the lamella such that the fin creates a bottom seal between the lamella and the ink reservoir;
- and
- two air holes configured to facilitate airflow between the inside of the lamella and the plurality of fins;
- and
- a feeder fluidically coupling the ink reservoir to the micro-spring of the writing tip assembly;
- wherein the feeder contacts a portion of the micro-spring extends beyond the lumen;
- and
- wherein a feeder end of the tip body is bent inward at least at a 100° angle to secure the micro-spring within the tip body, such that a bent inner diameter of the tip body is less than a maximum diameter of the micro-spring at the feeder end.
Dependencies are inferred from the claim text.