JP5868633B2 - Intrusion ballpoint pen - Google Patents

Description

  The present invention relates to a retractable ballpoint pen including a retracting mechanism that allows a tip end portion of a ballpoint pen tip to protrude from a tip opening portion of a shaft tube.

  Conventionally, a ballpoint pen tip formed by rotatably holding a ball is attached to the tip of an ink storage cylinder directly or via a chip holder, and ink for ballpoint pen is directly stored in the ink storage cylinder. The ballpoint pen refill is stored in the shaft tube by being biased toward the rear end side of the shaft tube by a coil spring, and the tip portion of the ballpoint pen tip can be protruded and retracted from the tip opening portion of the shaft tube. It is well known for the penetrating ballpoint pen.

  In such a retractable ball-point pen tip, as disclosed in Japanese Patent Application Laid-Open No. 07-204567, “Applicator”, a coil spring is provided at the back of the ball, and the ball is pressed against the inner wall of the tip of the tip to cause ink leakage from the tip of the tip. Many structures have been proposed that prevent this.

  Many proposals have been made to increase the longitudinal clearance of a ball for the purpose of increasing the amount of ink supplied, as disclosed in Japanese Patent Application Laid-Open No. 06-15218 “Method for Manufacturing Applicator”.

Japanese Patent Laid-Open No. 07-204567 Japanese Patent Laid-Open No. 06-15218

  However, Patent Documents 1 and 2, etc., for the purpose of increasing the ink supply amount, etc., and increasing the clearance in the vertical direction of the ball, when used for a knock type ballpoint pen, due to the impact at the time of knocking, particularly the impact at the time of immersion, There is a problem in that the amount of movement of the ball is large and the ball is likely to jump out from the tip end portion.

  In view of such a problem, if the pressing force of the coil spring that urges the ballpoint pen refill is simply reduced, there is a problem that the ballpoint pen tip will inadvertently protrude from the tip opening of the shaft tube during movement.

  The present invention has been made in view of these conventional techniques, and it is an object of the present invention to provide a retractable ballpoint pen that is less likely to jump out of the ball due to an impact such as dropping or knocking and that can obtain a stable ink outflow amount. is there.

In order to solve the above-mentioned problem, the ball pen tip formed by rotatably holding the ball at the tip of the ink containing cylinder is mounted directly or via a chip holder in order to solve the above problem. A ballpoint pen refill containing ink for ballpoint pen is stored in the shaft cylinder by urging it toward the rear end side of the shaft cylinder by a coil spring , and a clip protruding outward from the shaft cylinder is stored in the front end of the shaft cylinder. A retractable ballpoint pen comprising a retractable mechanism with a rotating cam that allows the tip of the ballpoint pen tip to protrude from the tip opening of the shaft tube by sliding in the direction of the opening, An attachment member for writing to or erasing from the writing surface is provided at the end, and the ink for ballpoint pen contains a pigment having a particle size of 0.1 to 30 μm. A coil spring that presses the tip against the inner wall of the tip end of the tip, and a seal surface substantially the same shape as the ball is provided on the inner wall of the tip end of the tip. In addition to providing a coating layer, the vertical clearance of the ball is 30 to 80 μm, the ink consumption per 100 m is 200 to 800 mg, and the holding force of the ball at the tip end of the ball is the back of the ballpoint pen refill. It is characterized by being larger than the pressing force of the coil spring biased toward the end side.

The ball pen tip has a caulking angle of 90 to 120 degrees, and the ball protrudes from the tip of the tip when the ball is placed on the bottom wall of the ball holding chamber. It is characterized by 40%.

Furthermore, the pressing force of the coil spring that presses the ball, characterized in that it is a from 1 to 20 g f.

  Furthermore, the ball is held in a bite shape in the chip at least when not written.

  According to the configuration of claim 1 of the present invention, in the retractable ballpoint pen, by providing an attachment portion for writing or erasing the writing surface at the rear end portion of the shaft tube, writing with a ballpoint refill and an attachment member It is possible to provide a retractable ballpoint pen to which two types of functions of writing or erasing are added. The attachment member of the present invention is not particularly limited to a marker, a correction pen, an eraser, a friction body, or the like, but is most preferably an eraser that erases or decolors the handwriting of the ballpoint pen refill. In addition, the above-described attachment portion may be integrated with the rear end portion of the shaft tube or may be mounted with a separate member.

  The ink for ballpoint pen contains a pigment having a particle size of 0.1 to 30 μm, the vertical clearance of the ball is 30 to 80 μm, and the ink consumption per 100 m is 200 to 800 mg. Thus, good handwriting and writing feeling can be obtained. This is because when the longitudinal clearance of the ball is less than 30 μm, the ink consumption for a ballpoint pen having a pigment having an average particle diameter of 0.1 to 30 μm is increased such that the ink consumption per 100 m is 200 to 800 mg. This is because when the thickness exceeds 80 μm, the amount of ink consumed is large and the handwriting drying property may be lowered, so that the thickness is most preferably 30 to 80 μm. By setting the ink consumption per 100 m to 200 to 800 mg, preferably 300 to 500 mg, it is possible to easily obtain a dark handwriting and a smooth writing feeling.

  Also, by providing a wear-resistant coating layer on the surface of the ball and / or the seal surface, the contact resistance between the ball and the inner wall of the chip is reduced, the ball rotates more smoothly and the wear resistance of the seal surface. Property can be remarkably improved, and more stable ink outflow can be obtained.

As the wear-resistant coating layer used in the present invention, diamond-like carbon (DLC), tungsten disulfide (WS ₂ ), molybdenum disulfide (MoS ₂ ), titanium nitride layer (TiN) and the like are conventionally known. Wear-resistant materials can be used as appropriate. In addition, the method for coating the wear-resistant coating layer is not particularly limited, and examples thereof include vacuum deposition, ion deposition, physical vapor deposition, chemical vapor deposition, vacuum arc deposition, and the like. It may be a coating layer. In particular, among the above-mentioned wear-resistant coating layers, it is most preferable to use diamond-like carbon (DLC) in consideration of lubricity.

  Examples of the pigment include inorganic, organic and processed pigments, and specifically include carbon black, titanium oxide, iron oxide, aluminum pigment, pearl pigment, fluorescent pigment, phosphorescent pigment, complementary color pigment, microcapsule pigment, and the like. Is mentioned. The size of the pigment particles in the present invention is merely an average size, and in the case of a spherical shape, indicates the average particle size, and is determined by a volume-based centrifugal sedimentation method or a laser diffraction method. I can do this. The pigment content is preferably 3 to 15% by mass with respect to the total amount of the ink composition.

  However, if the above-described clearance of 30 to 80 μm is satisfied, when the retractable ballpoint pen and the rear end of the barrel are provided with an attachment member for writing or erasing the writing surface, the knocking operation or use of the attachment member is required. Occasionally, the ball is easily impacted and the ball is likely to move, and the ball may drop. Therefore, in the present invention, in addition to the above-described configuration, increasing the ball holding force is also an important configuration. Specifically, when the holding force higher than the spring force of the coil spring that biases the ball-point refill, for example, the spring force of the coil spring that biases the ball-point refill is 200 gf, the ball holding force is 200 gf. The ball is prevented from popping out by making it larger, preferably at least twice the resilience of the coil spring that urges the ballpoint pen refill. The elastic force of the coil spring that urges the ballpoint pen refill is preferably 100 gf to 500 gf, considering that the ballpoint pen tip does not inadvertently protrude from the tip opening of the shaft tube, such as operability and movement. More preferably, it is 200 gf to 400 gf. The ball holding force indicates a force required to press the ball from the rear end side of the chip and the ball jumps out from the tip end portion.

  The ball material used in the present invention is not particularly limited, such as tungsten carbide super hard material, ceramic material such as zirconia, stainless steel material, etc., and the chip body is also particularly limited to stainless steel, copper alloy, aluminum, etc. It is not a thing.

  According to the configuration of claim 2 of the present invention, the ball protruding from the tip end of the ball placed on the bottom wall is 25 to 40% of the ball diameter, and the caulking angle By setting the angle to 90 degrees to 120 degrees, good writing and impact resistance performance can be obtained. This is because if the ball is less than 25% of the ball diameter, the tip of the tip tends to hit the writing surface such as the writing surface during writing, and the tip of the tip tends to be damaged. If it is larger than 40%, the ball holding force becomes weak, and the impact resistance performance such as dropping falls. In addition, by forming the caulking angle at an obtuse angle, there is an effect of increasing the ball holding force of the tip end portion. However, if the caulking angle exceeds 120 degrees, the tip end of the chip is likely to hit the writing surface such as the writing surface during writing, so the caulking angle is most preferably 90 to 120 degrees.

According to the third aspect of the present invention, 1 to 30 g f the pressing force of the coil spring that presses the ball, preferably, by a 15-25 g f, to obtain good writing and impact resistance Can do. This pressing force of the coil spring that presses the ball is less than 1 g f, difficult to suppress the movement of the ball due to impact, and greater than 30 g f, is writing performance and writing performance in order to decrease.

  According to the configuration of claim 5 of the present invention, since the ball is held in the chip at least at the time of writing, even if it receives vibration or impact during movement, the pressing force of the coil spring Since the ball is difficult to move due to the synergistic effect, air ingress and ink leakage can be prevented. In the present invention, holding on the sealing surface in a biting manner means that even when the pressing force of the coil spring is lost, the coil spring is pressed against the sealing surface, and the position is maintained even if the ball side faces upward. is there.

  The present invention has been able to provide a retractable ballpoint pen that is less likely to drop due to an impact such as dropping or knocking and that can provide a stable ink outflow amount.

1 is a longitudinal sectional view showing a retractable ballpoint pen of Example 1. FIG. FIG. 2 is an enlarged cross-sectional view of a principal part, partially omitted, showing a state where the ball is placed on the bottom wall of the ball holding chamber in FIG. 1. It is an external view which shows the state which uses the attachment part in FIG.

Example 1
1 to 3 show a retractable ballpoint pen 1 according to a first embodiment. The retractable ballpoint pen 1 slides a ballpoint pen refill 12 accommodated in a shaft cylinder body obtained by screwing the front shaft 2 and the rear shaft 3 toward the rear end of the rear shaft 3 by the coil spring 11. It is energized and accommodated freely. The intruding mechanism has a pressing portion 5 provided integrally with a clip 4 that protrudes outward from the rear shaft 3, and rotates by sliding the clip 4 in the direction of the front end opening 2 a of the front shaft 2. By operating a conventionally known rotary mechanism comprising a cam 6 and a push rod 7, a ball pen tip 15 can be projected and retracted from the front end opening 2 a of the front shaft 2. The urging force of the coil spring 11 that urges the ballpoint pen refill 12 toward the rear end of the shaft tube was 200 gf as a result of measurement with a push-pull scale.

  When the clip 4 is slid in the direction of the front end opening 2a of the front shaft 2 against the urging force of the coil spring 11 in a state where the ballpoint pen tip 15 is immersed from the front end opening 2a of the front shaft 2, the clip 4 is integrated with the clip 4. The formed pressing portion 5, the push rod 7 and the rotating cam 6 are operated, and writing can be performed while maintaining the state in which the tip portion of the ballpoint pen tip 15 protrudes.

  A friction portion 9 (attachment portion) made of silicone rubber is provided at the rear end portion of the rear shaft 3 via a tail crown 8. The friction portion 9 is pressed against the writing surface 27 and heat generated by rubbing. Can change the handwriting color. A grip 10 is attached to the front shaft 2.

  The ballpoint pen refill 12 extends to a chip body 16 made of a stainless steel wire, a ball holding chamber 17, an ink circulation hole 20 in the center of the ball holding chamber 17, and a radial communication with the ink circulation hole 20. By having an ink circulation groove 19 that does not reach the hole 21 and placing a ball 22 made of tungsten carbide of φ0.7 mm on the bottom wall 18 of the ball holding chamber 17 and caulking the tip end portion 16a inside, A ballpoint pen tip 15 that is rotatably held so that a part of the ball 22 protrudes from the tip end edge of the tip is mounted on the tip end portion of the ink containing cylinder 13 via a tip holder 14. A tail plug 24 is attached to the rear end of the ink containing cylinder 13.

  The ballpoint pen tip 15 is formed by cutting a stainless steel wire having a diameter of 2.3 mm and a hardness of 230 Hv to 280 Hv to a desired length, and producing a ball holding chamber 17, an ink circulation groove 19, an ink circulation hole 20, and a rear hole 21. A ball is placed on the bottom wall 18 of the ball holding chamber 17, and a sealing surface substantially the same shape as the ball 22 is formed on the inner wall of the tip end portion 16a by rear hammering. Further, clearance is obtained by the rear hammer ring, and the ball 22 is held in the tip end portion 16a by biting.

  The ball protrusion H from which the ball 22 protrudes from the tip end in a state where it is placed on the bottom wall 18 is 30% of the ball diameter, the caulking angle α is 110 degrees, and the vertical clearance of the ball is 50 μm. Further, a coil spring 23 is disposed behind the ball 22, and the ball 22 is pressed against the inner wall sealing surface side of the tip end portion 16a by this pressing force. The pressing force of the coil spring 23 that presses the ball 22 was 20 gf, and the ball holding force was 400 gf. The surface of the sealing surface and the bottom wall 18 are previously provided with a wear-resistant coating layer V composed of a surface layer portion of diamond-like carbon (DLC).

  The ink container 13 contains a reversibly thermochromic microcapsule pigment having an average particle size of 0.5 μm, and an ink viscosity at 1 rpm in an EM type rotational viscometer is 1020 mPa · s (25 ° C.). Water-based ballpoint pen ink 25 having an ink viscosity at 100 rpm of 84 mPa · s (25 ° C.) and a shear thinning index of 0.48, and a grease-like ink follower 26 are directly accommodated at the rear end of the ink. It is. The ink viscosity is preferably 40 to 200 mPa · s at 100 rpm in an EM rotational viscometer.

  When the ball pen refill 12 is written, the ball 22 moves to the bottom wall 18 side by the amount of the clearance in the vertical direction by the rotation of the ball 22 and the writing pressure, and a gap is formed between the inner wall of the tip end portion 16a and the ball 22. The ink can be ejected and written.

  When the pressing force of the coil spring 23 that presses the ball 22 is A and the urging force of the coil spring 11 that urges the ball pen refill 12 toward the rear end of the shaft cylinder is B, when A <1 / 20B, Is too large and it is difficult to suppress the movement of the ball, it is preferable that A> 1 / 20B is satisfied.

  In this embodiment, for the sake of convenience, an in / out type ballpoint pen having an in / out mechanism composed of a rotating cam is illustrated, but the number of writing bodies and the in / out mechanism are particularly limited, such as a multi-core, single-core, and rotary feeding mechanism. is not.

  Furthermore, in this embodiment, the wear-resistant coating layer is provided only on the chip body for convenience, but the wear-resistant coating layer may be provided only on the chip body and the surface of the ball or on the surface of the ball, and also on the bottom wall. Most preferably, a lubricating coating layer is provided. .

  The retractable ballpoint pen of the present invention can be used without being limited to the ink to be used, regardless of the type of ink, such as ink for oil-based ballpoint pens, ink for water-based ballpoint pens, ink with shear thinning viscosity, correction ink, etc. Since it can be used, it can be widely used as a retractable ballpoint pen.

DESCRIPTION OF SYMBOLS 1 Retractable ball-point pen 2 Front shaft 2a Front end opening 3 Rear shaft 4 Clip 5 Pressing portion 6 Rotating cam 7 Push rod 8 Head crown 9 Friction tool 10 Grip 11 Coil spring 12 Ball pen refill 13 Ink storage cylinder 14 Tip holder 15 Ball pen tip 16 Tip body 16a Tip tip 17 Ball holding chamber 18 Bottom wall 19 Ink flow groove 20 Ink flow hole 21 Rear hole 22 Ball 23 Coil spring 24 Tail plug 25 Ink for ballpoint pen 26 Ink follower 27 Writing surface V Wear-resistant coating layer

Claims (4)

A ballpoint pen refill is formed by mounting a ballpoint pen tip that holds a ball in a rotatable manner directly or via a tip holder at the tip of the ink storage tube, and directly storing the ink for the ballpoint pen in the ink storage tube. The ball-point pen tip is accommodated in the shaft tube by being biased toward the rear end side of the shaft tube by a coil spring, and the clip projecting outward from the shaft tube is slid toward the front end opening of the shaft tube. A retractable ball-point pen having a retractable mechanism with a rotating cam that allows the distal end of the shaft to be retracted from the distal end opening of the shaft tube, and writing or erasing the writing surface on the rear end of the shaft tube And the ballpoint pen ink contains a pigment having a particle size of 0.1 to 30 μm, and presses the ball against the inner wall of the tip end portion behind the ball. Provided with a seal spring on the inner wall of the tip end portion of the chip, and provided with a wear-resistant coating layer on the surface of the ball and / or the seal surface, and in the longitudinal direction of the ball. The clearance is 30 to 80 μm, the ink consumption per 100 m is 200 to 800 mg, and the holding force of the ball at the tip of the tip is based on the pressing force of the coil spring that urges the ball pen refill toward the rear end of the shaft cylinder An inflatable ballpoint pen characterized by its large size. The ball pen tip has a caulking angle of 90 to 120 degrees, and the ball protrudes from the tip of the tip when the ball is placed on the bottom wall of the ball holding chamber. The retractable ballpoint pen according to claim 1, wherein: The pressing force of the coil spring that presses the ball, retractable ballpoint pen according to claim 1 or 2, characterized in that a 1 to 30 g f. 4. The retractable ballpoint pen according to any one of claims 1 to 3, wherein the ball is held in the chip at least when not written.

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