Needle tubing spring pen point and ball-point pen cartridge comprising same

Abstract

The invention provides a needle tubing spring pen point. The needle tubing spring pen point comprises a cylindrical ball seat body, a ball and a spring, wherein one end of the ball seat body is provided with a ball seat; the other end of the ball seat body is provided with an opening and a lock part adjacent to the opening; the ball seat body also comprises an ink supply passage formed between the ball seat and the opening; the ball seat is provided with a central hole and a plurality of oil slots; the ball is arranged in the ball seat and is protruded from the ball seat; the spring is positioned in the ink supply passage and is made of stainless steel wires with the diameter of 0.08-0.1mm; the external diameter of the spring is 0.5-0.55mm; and the edge of the ball seat is bent and deformed towards the ball to receive balls, so that a radial gap and an axial gap are formed between the edge and the balls. The invention also provides a ball-point pen cartridge comprising the needle tubing spring pen point. By the needle tubing spring pen point, the whole spring can be placed in the pen point under the condition that the pen point is thinner and the inside space is smaller, and can be matched with ink with middle viscosity and thixotropy to achieve a better effect.

Description

technical field [0001] The invention relates to a needle tube type spring nib for a ballpoint pen and a ballpoint pen refill comprising the spring nib. Background technique [0002] Existing ball-point pens include ink ball-point pens (medium oil ink ball-point pens, erasable ink ball-point pens), neutral ink ball-point pens (erasable neutral ink ball-point pens), water-based ink ball-point pens, etc. [0003] Among them, neutral ink ballpoint pens have relatively high technical content and relatively high technical difficulty, because neutral ink ballpoint pens use water-based, medium-viscosity, and thixotropic inks. Neutral ink ballpoint pens are divided into two structures: fixed type and movable type. The fixed type will cover the pen tip when not in use, and there is a rubber ball in the pen cap to seal the front cone of the pen tip so that the ink will not evaporate and dry up. . The air will not enter the gap between the ball and the ball seat, ensuring good initial...

AI Technical Summary

Problems solved by technology

In short, there is a very fatal flaw in the above-mentioned assumptions. The length of the straight spring wire must be more than 6.5mm, and the diameter is only 0.15mm or less. It is difficult to keep it vertical and always in the center.

Coupled with the assembly error between the needle tube tip and the plastic connection, such as the non-concentricity and non-perpendicularity of the two, it is impossible to guarantee that the straight spring wire can be pushed against the center of the ball after passing through the needle tube.

If the spring wire cannot ensure that it is in the center of the ball, not only will it not be able to play the role of a one-way valve, but it may also cause the ball to be biased to one side, resulting in one-sided writing stitches, poor writing feel, and even the ball cannot be rotated.

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