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] The utility model relates to a needle tube type spring pen head in stationery field. BACKGROUND

[0002] The common needle tube type pen head is processed by non-cutting mode, the outer diameter is 0.8mm, the length is 6.5mm, and the protruding ball seat supports the ball in the inner wall of the front end of the thin tube.CN201376405Y and CN214240145U disclose a needle tube type spring pen head, which is provided with a spring stylus in the needle tube for resisting the ball to prevent the pen head from leaking ink. Since the slender stylus at the front end of the spring in the needle tube type spring pen head is prone to bending deformation, the shape of the ink groove between the protrusions of the ball seat is complex, and thus the front end of the slender stylus is prone to deviating from the center of the ball and being clamped into the gap of the ball seat, affecting the rotation of the ball and the normal ink discharge of the pen head. SUMMARY

[0003] The utility model solves the technical problem: in view of the defects of prior art, the stylus with the length of the front end of the spring being less than the diameter of the spiral wire is aligned with the center of the ball, the ink flows smoothly along the uniform spring pitch space in the small tube hole of the pen head, and the product quality of the needle tube type spring pen head is further improved.

[0004] The technical scheme of the utility model: the needle tube type spring pen head comprises a ball and a needle tube, characterized in that: the stylus with the length of the front end of the spring being less than the diameter of the spiral wire is arranged in the gap close to the protrusion in the needle tube hole.

[0005] The utility model has the beneficial effects: the spring stylus structure in the needle tube type pen head tube hole is stable and reliable, the protrusion ball seat is arranged close to the spiral wire of the spring, the length of the stylus can be shortened to the maximum extent, the stylus is kept in the center position, the ball rotates flexibly, the long stylus is prevented from being bent and clamped into the ink groove, the uniform pitch space of the front end of the spring with the stylus forms a smooth and unobstructed ink supply pipeline, and the handwriting is clear and the lines are intact during writing. DRAWING DESCRIPTION

[0006] Figure 1 It is the structure schematic diagram of the utility model; Figure 2 It is Figure 1 A-A section schematic diagram of

[0007] In the drawing: 1. ball; 2. protrusion; 3. stylus; 4. spring; 5. needle tube; 6. tube hole; 7. ink groove. CONCRETE IMPLEMENTATION

[0008] As Figure 1As shown, after the spring 4 is compressed in the tube hole 6 of the needle tube 5, the front end of the spring 4 is provided with the stylus 3 which is aligned with the ball 1. When not writing, the stylus 3 pushes the ball 1 to close the pen head under the elastic force to prevent the ink from evaporating and leaking. When writing, the pressure acting on the pen pushes the ball 1 to open the pen head. The ink in the needle tube type pen head thin tube flows smoothly along the uniform pitch space. The ball of the pen head rolls flexibly to bring out the ink, realizing the smooth and fluent effect of the needle tube type spring pen head writing.

Claims

1. A needle tube type spring pen point in the field of stationery, comprising a ball and a needle tube, characterized in that: The needle tube hole has a small gap next to the protrusion, and the front end of the uniform spring spiral wire has a thimble smaller than the diameter of the spiral wire. ​

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