JP6084381B2 - 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 ballpoint pen, as shown in Japanese Patent Application Laid-Open Publication No. 2012-91470, “Thermochromic Writing Tool”, a retractable writing tool in which the handwriting of the thermochromic ink can be thermally discolored by a friction body provided at the rear end of the shaft cylinder. Many have been proposed.

JP 2012-91470 A

  However, in the conventional retractable writing instrument such as Patent Document 1 described above, since the tangent angle between the friction body and the operating body is small with respect to the shaft center of the shaft cylinder, the writing surface and the clip come into contact with each other when the friction body is used. There is a problem that it is easy to use the friction body, and the angle at which the friction body is used is limited.

  The present invention has been made in view of these prior arts, and is to provide a thermochromic retractable ballpoint pen that has a friction body at the rear end portion of the shaft tube that is easily discolored only at a desired portion. 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 that directly contains thermochromic ink is stored in the shaft tube by being biased toward the rear end side of the shaft tube by a coil spring, and protrudes outward from the outer peripheral surface of the shaft tube. A retractable ballpoint pen comprising a retracting mechanism that allows the tip of the ballpoint pen tip to protrude and retract from the tip opening of the shaft tube by operating the operation part of the operating body, wherein the rear end of the shaft tube A friction body having a rubber-like elasticity capable of thermally discoloring the handwriting of the thermochromic ink by frictional heat generated at that time, and the rear end of the shaft tube The maximum outer diameter of the part is the friction Maximum not more than 1.0 times to 1.5 times the outer diameter of and a maximum width in the circumferential direction of the operating unit, as well as smaller than the maximum outer diameter of the friction body, the operating unit, the barrel The protruding and retracting mechanism includes a rotating cam positioned rearward of the intermediate portion of the entire length of the writing instrument, and the ballpoint pen moves when the rotating cam moves forward. When the tip is in a protruding state, the tangent line between the friction body and the operation unit faces the friction body downward and the axis of the shaft cylinder is perpendicular to the writing surface, the angle from the writing surface is 60 or less 80 degrees degrees, the ballpoint pen tip is an intermediate portion or features that you located behind the writing instrument full length center of gravity in a state of protruding.

  The maximum outer diameter of the friction body is 1.0 mm to 7.0 mm.

  The longitudinal distance from the rear end of the friction body to the operation portion is at least twice the longitudinal length of the friction body exposed to the outside from the rear end of the shaft tube.

  According to the first configuration of the present invention, it is a retractable ballpoint pen that rubs the handwriting of the thermochromic ink on the rear end portion of the shaft cylinder, and the thermochromic ink is generated by frictional heat generated at that time. A friction body having a rubber-like elasticity capable of thermally discoloring the handwriting, and the maximum outer diameter of the rear end portion of the shaft cylinder is 1.0 to 1.5 times the maximum outer diameter of the friction body, In addition, the maximum width in the circumferential direction of the operation portion is made smaller than the maximum outer diameter of the friction body, the tangent line between the friction body and the operation portion faces down the friction body, and the axis of the shaft cylinder is written. When the surface is perpendicular to the surface, the angle from the writing surface is 60 degrees or more, so that the handwriting of the thermochromic ink can be easily seen regardless of the appearance of the ballpoint pen tip, and only the desired part is heated. The effect is easy to discolor.

  First, when the maximum outer diameter of the rear end portion of the shaft cylinder exceeds 1.5 times the maximum outer diameter of the friction body, the rear end portion of the shaft cylinder blocks the handwriting from being recognized when the friction body is used. If the maximum outer diameter of the friction body is larger than the maximum outer diameter of the rear end portion of the shaft cylinder (less than 1.0 times), the operation body may be difficult to operate. The maximum outer diameter of the friction body is 1.0 to 1.5 times the maximum outer diameter of the friction body, and when the friction body is used, the shaft cylinder rear end portion is prevented from blocking the handwriting, This is because visibility is enhanced. Further, not only the rear end portion of the shaft cylinder but also the rear end of the shaft cylinder of the friction body is 1/3 or more of the entire length of the writing instrument, more preferably 1/2 or more, and most preferably, the maximum outer diameter of the entire writing is set to the friction body. The visibility of handwriting can be further enhanced by setting the maximum outer diameter to 1.0 to 1.5 times.

  Next, when the tangent line between the friction body and the operation unit faces the friction body downward and the axis of the shaft cylinder is perpendicular to the writing surface, the angle from the writing surface is 45 degrees or more, When the user uses a friction body, the operator itself when holding the writing instrument, and the use angle of the friction body (angle of the writing instrument), specifically, without worrying about the contact between the writing surface and the operation unit Can be used. However, in order to thermally discolor only the desired portion, when the friction body is directed downward and the axis of the shaft cylinder is perpendicular to the writing surface, the tangent line between the friction body and the operating portion is 60 degrees or more. Preferably, the visibility to the handwriting when using the friction body is further increased by setting the angle to 70 degrees or more. In addition, when the friction body and the operation body make the axis of the shaft cylinder perpendicular to the writing surface, the tangent may be 90 degrees or more, but in view of the operability of the operation body, 80 degrees or less. It is preferable that Further, when a ball having a ball diameter of less than φ0.5 mm is used, the handwriting tends to be small, and thus the effect of the present invention is remarkable.

  According to the second configuration of the present invention, when the maximum outer diameter of the friction body is 1.0 mm to 7.0 mm, it is easy to visually recognize the handwriting of the thermochromic ink, and only a desired portion is heated. The effect is easy to discolor. This is because many common notebooks are provided with horizontal ruled lines at a pitch of 7 mm, and a large number of 8 mm and 10 mm pitches are commercially available. Therefore, by setting the maximum outer diameter of the friction body to 7.0 mm or less, preferably 6.0 mm or less, when using the friction body, visibility to the handwriting written in the ruled line can be improved. This is because the maximum outer diameter of the friction body is preferably 7.0 mm or less. Moreover, if the maximum outer diameter of the friction body is smaller than 1.0 mm, the friction body may be damaged when the friction body is used. Therefore, the maximum outer diameter of the friction body is preferably set to 1.0 mm or more.

  According to the third configuration of the present invention, the distance in the longitudinal direction from the rear end of the friction body to the operation portion is twice the length in the longitudinal direction where the friction body is exposed to the outside from the rear end of the shaft cylinder. By setting it as the above, there exists an effect which is easy to visually recognize the handwriting of a thermochromic ink, without reducing the visibility of a handwriting by the said operation part. However, if the distance in the longitudinal direction from the rear end of the friction body to the operation portion is too long, it becomes difficult to operate the operation portion. Therefore, the length in the longitudinal direction where the friction body is exposed to the outside from the rear end of the shaft cylinder. 3 times or less is preferable.

According to the first configuration of the present invention, the writing instrument placed sideways on the desk is accidentally dropped by locating the center of gravity position in the state where the ball-point pen tip protrudes at the middle part or the rear of the writing instrument. However, it can be made difficult to fall to the floor surface from the tip end portion side, and damage to the tip end portion can be suppressed. In particular, even with a dent of the same size, the smaller the ball, such as φ0.5 mm or less, the smaller the caulking inner diameter tends to be, and the greater the influence of the dent on the inner diameter, the more remarkable the effect of this configuration. It is. In addition, since the friction body provided at the rear end of the shaft cylinder has rubber-like elasticity, if it falls and collides with the floor surface from the friction body, there is an effect that can reduce the impact. It is preferable to be located rearward. In addition, in this invention, an intermediate part is not limited to the position equidistant from both ends of a writing instrument full length, but the vicinity is included.

  The friction body includes a rubber-like elastic member such as silicone rubber, fluorine rubber, chloroprene rubber, nitrile rubber, polyester rubber, ethylene propylene diene rubber (EPDM), styrene elastomer, ester elastomer, olefin. Rubber having elasticity like rubber, elastomer and the like can be mentioned, and can be appropriately selected and used. Further, the friction body described above may be formed integrally with the rear end portion of the shaft tube, or may be attached by fitting another member. Moreover, Shore A hardness 40 or more and 100 or less are preferable.

  The thermochromic ink used in the present invention is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

  The coloring material contained in the reversible thermochromic ink includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic microcapsule pigment in which a reversible thermochromic composition containing at least three essential components of a reaction medium for determining the occurrence temperature of the microcapsule is preferably used.

  The present invention was able to provide a thermochromic retractable ballpoint pen having a friction body at the rear end portion of the shaft tube, which easily changes the color of only a desired portion.

It is a longitudinal cross-sectional view which shows the retractable ball-point pen of Embodiment 1. FIG. It is a figure which shows the state which the ball-point pen tip in FIG. 1 protruded. It is the principal part expanded sectional view in which a part of ball-point pen tip in Drawing 1 was omitted. It is the external view seen from the upper surface direction in FIG. It is an external view which shows an example of the state which uses the friction body in FIG. It is an external view which shows the other example of the state which uses the friction body in FIG.

  1 to 6 show a retractable ballpoint pen 1 according to the first embodiment. The retractable ballpoint pen 1 includes a front pen 2 and an intermediate shaft 3 screwed together, and a ballpoint pen refill contained in a shaft cylinder body obtained by fitting the rear shaft 4 over the rear end of the intermediate shaft 3. 2 is housed by being slidably urged toward the rear end of the rear shaft 4 by a coil spring 8 disposed between the spring receiving member 7 and the rotary cam 6 disposed at the rear end. Further, in the intermediate shaft 3, a retracting mechanism including a rotating cam 6 is provided. Although not shown, a cam groove is provided on the inner surface of the intermediate shaft 3.

  Further, an elongated window hole 4A extending in the longitudinal direction is provided in the outer peripheral surface of the rear shaft 4 so as to communicate with the inside and outside in the radial direction, and the radial direction from the outer peripheral surface of the rear shaft 4 through the window hole 4A. A transparent operation body 5 is disposed so as to protrude outward. The operation body 5 is formed with an operation portion 5A protruding outward from the window hole 4A and a plurality of serrated cam portions (not shown) at the tip so as to move the rotary cam 5 forward and induce rotation. Shaft portion 5B.

  In order to use the retractable ballpoint pen 1, an operating body is disposed so as to protrude outward from the radially outer peripheral surface of the rear shaft 4 from the state in which the front end portion of the ballpoint pen tip 12 is immersed in the front end opening 2 </ b> A of the front shaft 2. When the operation portion 5A of 5 is slid in the direction of the front end opening 2A of the front shaft 2 along the window hole 4A provided in the rear shaft 4 against the urging force of the coil spring 8, the shaft portion 5B of the operation body 5 is obtained. Thus, the rotary cam 6 is actuated so that the tip of the ballpoint pen tip 12 can be written while maintaining the state of protruding from the tip opening 2A of the front shaft 2. The above-described in / out mechanism is a conventionally in-and-out mechanism composed of the rotating cam 6, and allows the ball-point pen tip 12 to enter and exit from the front end opening 2 </ b> A of the front shaft 2. The urging force of the coil spring 8 that urges the ballpoint pen refill toward the rear end side of the rear shaft 4 was 150 gf as a result of measurement with a push-pull scale, and the ink consumption per 100 m was 180 mg.

The rear end of the rear barrel 4, Yes and worn by fitting riding past the friction body 9 made of whether we polyester elastomer, 5, as shown in FIG. 6, the writing surface 21 of the friction body 9 of the notes or the like, The handwriting of the thermochromic ink can be thermally decolored or discolored by heat generated by pressing and rubbing the handwriting written between the horizontal ruled lines P. With the ball-point pen tip 12 immersed in the front shaft 2, the angle β of the tangent S between the operation portion 5 </ b> A of the operation body 5 and the friction body 9 was 78 degrees with respect to the axis J.

  The total length L of the retractable ballpoint pen in the present embodiment is 144.0 cm with the tip of the ballpoint pen tip 12 projecting from the front shaft 2, and with the tip of the ballpoint pen tip 12 projecting from the front shaft 2. The center-of-gravity position G was 71.5 cm from the tip of the ballpoint pen tip 12 and 72.5 mm from the rear end of the friction body 9. In order to confirm the state of falling from the desk, the drop-type ballpoint pen 1 was placed in a parallel state with respect to the ground, and as a result of a drop test of dropping from a height of 1 m, the tip 13 was not dropped and the caulking portion 13A was There was no damage.

  The maximum width (outer diameter) A of the friction body 9 is 6 mm, and the maximum width E in the circumferential direction of the operation portion 5A is 2 mm (A> E). The maximum width (outer diameter) A of the friction body 9 is smaller (A> B) than the maximum width (outer diameter) B (7 mm) of the rear end portion of the rear shaft 4. The total weight of the retractable writing instrument 1 is 9.0 g, the maximum width D (outer diameter) of the front shaft is 9.0 mm, the maximum width (outer diameter) of the intermediate shaft is 9.0 mm, and the maximum width C of the rear shaft ( The outer diameter was 8 mm. Further, the longitudinal distance Q from the rear end of the friction body 9 to the operation portion 5A was 2.7 times the longitudinal length R of the friction body 9 exposed from the rear end of the rear shaft 4 to the outside.

  The ballpoint pen refill extends to a chip body 13 made of a stainless steel wire, a ball holding chamber 14, an ink circulation hole 17 in the center of the ball holding chamber 14, and a radial shape communicating with the ink circulation hole 17. A ball 19 made of tungsten carbide having a diameter of 0.38 mm is placed on the bottom wall 15 of the ball holding chamber 14 and the caulking portion 13A at the tip of the tip is caulked inward. Thus, the ball-point pen tip 12 that is rotatably held so that a part of the ball 19 protrudes from the tip end edge of the ball 19 is attached to the tip end portion of the ink containing cylinder 10 via the tip holder 11.

  The ballpoint pen tip 12 is formed by cutting a stainless steel wire having a diameter of 2.3 mm and a hardness of 230 Hv to 280 Hv into a desired length, and producing a ball holding chamber 14, an ink circulation groove 16, an ink circulation hole 17, and a rear hole 18. A ball 19 is placed on the bottom wall 15 of the ball holding chamber 14, and a sealing surface substantially the same shape as the ball 19 is formed on the inner wall of the caulking portion 13 </ b> A at the tip end of the tip by rear hammering. Further, a coil spring 20 is disposed behind the ball 19, and the ball 19 is pressed against the inner wall sealing surface side of the caulking portion 13A by this pressing force. The pressing force of the coil spring 20 that presses the ball 19 is 20 gf.

  By setting the pressing force of the coil spring 20 that presses the ball 19 to be larger than the entire (product) weight of the retractable ballpoint pen 1 and 30 g or less, good writing and impact resistance can be obtained. This is because if the pressing force of the coil spring 20 that presses the ball 19 is smaller than the product weight, it is difficult to suppress the movement of the ball due to impact, and ink leakage is likely to occur. Further, if the pressing force of the coil spring 20 that presses the ball 19 is larger than 30 g, the writing performance and writing quality are deteriorated.

  The ink containing cylinder 11 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.), A thermochromic water-based ballpoint pen ink (not shown) 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 at the rear end of the ink A follower (not shown) is accommodated directly. The ink viscosity is preferably 40 to 200 mPa · s at 100 rpm in an EM rotational viscometer.

  Although the pressing force of the coil spring that presses the ball is not particularly limited, good writing and impact resistance can be obtained by setting it to be larger than the product weight and 30 g or less. This is because if the pressing force of the coil spring that presses the ball is smaller than the product weight, it is difficult to suppress the movement of the ball due to impact, and ink leakage is likely to occur. Further, if the pressing force of the coil spring that presses the ball is larger than 30 g, the writing performance and writing quality are deteriorated.

  In this embodiment, for convenience, a ball of 0.38 mm is used, but the ball diameter is not particularly limited. However, as in the embodiment, using a ball of φ0.4 mm or less, the vertical clearance of the ball is 30 to 50 μm, and the ink consumption per 100 m is 150 to 300 mg. It is preferable because handwriting and writing feeling can be obtained. This is because if the longitudinal clearance of the ball is less than 30 μm, it is difficult to increase the ink consumption such that the ink consumption per 100 m is 150 to 300 mg. On the other hand, when the vertical clearance of the ball exceeds 50 μm, when a ball of φ0.4 mm or less is used, the tip tip is thin and the ball holding force is reduced. This is because it is most preferable. The ink consumption per 100 m was written on a writing tester under the conditions of a load of 100 g, a writing speed of 4 m / min, a writing angle of 70 degrees and 20 ° C. according to JIS S6054, and the ink consumption per 100 m. It can be obtained by calculating (average value of 10).

The total weight (product weight) of the retractable ballpoint pen is not particularly limited, but the impact caused by dropping is F = mV / t (impact force F [N], the mass of the object is m [kg], Deceleration time can be expressed as t [s], V = √ (2gh) (g is gravitational acceleration = 9.8 [m / s ² ], h is height [m]). In particular, when a small-diameter ball having a diameter of 0.5 mm or less is used, the thickness of the caulking portion at the tip end of the tip is thin, and a dent is easily formed at the time of dropping. It is preferable to suppress this drop impact by making the following: However, if the product weight is too small, it will move when a hand, elbow, book, notebook, etc. hits the retractable writing instrument placed sideways on the desk. The product weight should be 5g or more. preferable.

  In the present embodiment, the operation portion 5A that is a projecting portion is a plate piece having an arc-shaped longitudinal section that also serves as a rolling prevention protrusion when the writing instrument is placed sideways on a desk, and is provided with a hole for attaching a charm. However, it is also possible to form or attach the clip integrally.

  Moreover, in this embodiment, although the axial cylinder main body is comprised by the front axis | shaft, the center axis | shaft, and the rear axis | shaft, it is not specifically limited. The shaft cylinder body and the operation body are formed of synthetic resin such as polycarbonate, polyethylene, ABS, or metal, but at least the operation body is preferably formed of transparent or translucent synthetic resin. As shown in FIG. 6, by making the operation body 5 transparent or translucent, it is difficult to reduce the visibility of the handwriting even when the operation unit 5A enters the field of view when the friction body 9 is used. It is because it can do.

  Further, as in the present embodiment, by making the width of the operating portion of the operating body smaller than the maximum width of the friction body, it is possible to easily recognize the handwriting on the writing surface when the friction body is used. However, since it becomes difficult to operate when the width of the operation body is reduced, it is preferable that the pressing force of the coil spring that urges the ballpoint pen refill toward the rear end side of the shaft cylinder is 100 to 200 g. If this is less than 100 g, the tip of the tip may inadvertently protrude, and if it exceeds 200 g, the operability is reduced, so the pressing force of the coil spring is 100 to 200 g, preferably 120 g. It is because it is preferable to set it as -180g.

Further, in this embodiment, for the sake of convenience, a retractable ballpoint pen provided with a retractable mechanism including a rotating cam is illustrated, but the retractable mechanism is not particularly limited. And Mochiiruko a retractable mechanism consisting of the rotating cam in consideration of operability and the like are preferable.

  The retractable ballpoint pen of the present invention can be widely used for notebooks and notebooks because only desired portions are easily discolored.

DESCRIPTION OF SYMBOLS 1 Retractable ball-point pen 2 Front shaft 2A Front opening 3 Intermediate shaft 4 Rear shaft 4A Sliding hole 5 Operation body 5A Operation portion 5B Shaft portion 5C Hole portion 6 Rotating cam 7 Spring receiving member 8 Coil spring 9 Friction body 10 Ink receiving cylinder DESCRIPTION OF SYMBOLS 11 Tip holder 12 Ball-point pen tip 13 Tip main body 13A Caulking part 14 Ball holding chamber 15 Bottom wall 16 Ink flow groove 17 Ink flow hole 18 Rear hole 19 Ball 20 Coil spring 21 Writing surface A Maximum outer diameter of friction body B Rear shaft rear Maximum outer diameter of the end C Maximum outer diameter of the rear shaft D Maximum outer diameter of the front shaft and the intermediate shaft E Width of the operation part G Center of gravity position H Ball out J Shaft center L Full length with the tip end protruding M Tip Distance from the tip to the center of gravity N Distance from the rear end of the friction body to the center of gravity Q Distance from the rear end of the friction body to the operating part R From the rear end of the rear axis of the friction body to the outside Exposed length S Tangent line α Caulking angle β Angle of tangent line between friction body and operation part

Claims (3)

A ballpoint pen in which a ballpoint pen tip formed by rotatably holding a ball is mounted at the tip of the ink storage cylinder directly or via a chip holder, and the thermochromic ink is directly stored in the ink storage cylinder. The refill is stored in the shaft tube by being biased toward the rear end side of the shaft tube by a coil spring, and by operating the operation portion of the operation body provided to project outward from the outer peripheral surface of the shaft tube, A retractable ballpoint pen that has a retractable mechanism that allows the tip of the ballpoint pen tip to protrude from the tip opening of the shaft cylinder, and rubs the thermochromic ink handwriting on the rear end of the shaft cylinder. And a friction body having a rubber-like elasticity capable of thermally discoloring the handwriting of the thermochromic ink with frictional heat generated at that time, and the maximum outer diameter of the rear end portion of the shaft cylinder is the maximum of the friction body 1.0 to 1.5 times the outer diameter And, and the maximum width of the circumferential direction of the operating unit, as well as smaller than the maximum outer diameter of the friction body, the operating unit is attached to protrude outward from the outer circumferential surface of the rear end portion of the barrel The in / out mechanism includes a rotating cam positioned rearward of the intermediate portion of the entire writing instrument, and when the rotating cam moves forward, the ball-point pen tip protrudes, and the friction body and the operating portion When the tangent line faces the friction body downward and the axis of the shaft cylinder is perpendicular to the writing surface, the angle from the writing surface is not less than 60 degrees and not more than 80 degrees, and the ball-point pen tip protrudes intermediate portion or retractable ballpoint pen characterized that you located behind the writing instrument full length position of the center of gravity of the at. The retractable ballpoint pen according to claim 1, wherein a maximum outer diameter of the friction body is 1.0 mm to 7.0 mm. The longitudinal distance from the rear end of the friction body to the operation portion is at least twice the longitudinal length of the friction body exposed to the outside from the rear end of the shaft cylinder. Or the retractable ballpoint pen described in 2.

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