Needle tube type spring pen point

Abstract

A needle tube type spring pen point in the field of stationery comprises a ball and a needle tube, and is characterized in that an ejector pin smaller than the diameter of a spiral wire is arranged at the front end of the spiral wire of a spring close to a uniform gap of a bulge in a needle tube hole. And a smooth ink supply pipeline is formed in a uniform screw pitch space, so that smooth and fluent writing, clear handwriting and intact lines are realized.

Description

Technical Field

[0001] This invention relates to a needle-type spring pen tip in the field of stationery. Background Technology

[0002] Ordinary needle-type pen tips are manufactured using non-cutting methods, with an outer diameter of 0.8 mm and a length of 6.5 mm. A raised ball seat on the inner wall of the thin tube's front end supports the ink ball. CN201376405Y and CN214240145U disclose a needle-type spring pen tip, in which a spring-loaded pin is installed inside the needle tube to hold the ink ball in place and prevent ink leakage. Because the slender pin at the front end of the spring inside the needle tube of the needle-type spring pen tip is prone to bending and deformation, and the ink grooves between the protrusions of the ball seat have complex shapes, the slender pin's front end can easily deviate from the center of the ink ball and get stuck in the gap of the ball seat, affecting the rotation of the ink ball and normal ink dispensing from the pen tip. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to improve upon the defects of the prior art by preferably aligning the tip of the spring with the center of the ball with the length of the spring front end being less than the diameter of the spiral wire, so that the ink can flow smoothly along the uniform spring pitch space in the small tube hole of the pen tip, thereby further improving the product quality of the needle tube type spring pen tip.

[0004] The technical solution of the present invention: a needle-type spring pen tip, comprising a ball and a needle, characterized in that: the front end of the spring spiral wire with uniform gap close to the protrusion inside the needle hole has a pin smaller than the diameter of the spiral wire.

[0005] The beneficial effects of this invention are: the spring-loaded pin structure inside the needle-type pen tip tube hole is stable and reliable; the spring spiral wire is set close to the protruding ball seat, which can minimize the pin length, keep the pin centered, and ensure that the ball rotates flexibly, thus avoiding the bending of a long pin and getting stuck in the ink groove; the uniform pitch space at the front end of the spring with the pin forms an unobstructed ink supply channel, ensuring clear handwriting and intact lines when writing. Attached Figure Description

[0006] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 yes Figure 1 Schematic diagram of AA section.

[0007] In the diagram: 1. Ball; 2. Protrusion; 3. Pin; 4. Spring; 5. Needle tube; 6. Tube hole; 7. Ink groove. Detailed Implementation

[0008] like Figure 1As shown, after the spring 4 is compressed in the tube hole 6 of the needle tube 5, the pin 3 set at the front end of the spring 4 is aligned with the ball 1. When not writing, the pin 3 pushes the ball 1 under the action of elasticity to seal the pen tip and prevent ink from evaporating and leaking. When writing, the pressure on the pen pushes the ball 1 to open the pen tip. The ink in the thin tube of the needle-type pen tip flows smoothly along the uniform pitch space. The ball of the pen tip rolls flexibly to carry out the ink, realizing the smooth and fluent writing effect of the needle-type spring pen tip.

Claims

1. A needle-type spring-loaded pen tip in the field of stationery, comprising a ball and a needle, characterized in that: The gap between the protrusion and the needle tube hole is uniform. The front end of the spring spiral wire has a pin smaller than the diameter of the spiral wire.

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