JP5676913B2 - Intrusive writing instrument - Google Patents

Description

  According to the present invention, a pen point portion of a writing body which is slidably arranged in a shaft tube by being biased by a coil spring in the direction of the rear end of the shaft tube is projected from the opening portion of the shaft tube by operating the operating body. The present invention relates to a retractable writing instrument equipped with a retractable mechanism.

  Conventionally, the pen tip of the writing body, which is slidably arranged in the shaft cylinder by a coil spring, can be projected from the front end of the shaft cylinder by operating the operating body. An in / out type writing instrument having an in / out mechanism such as a knock type, a slide type, and a rotary type is well known.

  In such a retractable writing instrument, when the retractable writing instrument is inserted into a pocket or the like with the pen tip protruding by mistake from the tip opening of the shaft tube, the ink for the writing instrument is particularly low in water-based ink or 25 ° C. In the case of an oil-based ink having a viscosity of 3000 mPa · s or less, there has been a problem that a pocket fabric or the like is stained with ink.

  In recent years, as a writing instrument ink, there are many writing instruments that use a so-called gel ink, a so-called gel ink, which has a statically high viscosity and has a shear-thinning viscosity that decreases when a ball rotates during writing. There is also provided a retractable writing instrument using the shear thinning ink. The shear-thinning ink is stored directly in the refill without using a filling ink storage or the like as in the case of water-based ink. Therefore, when provided as a retractable ballpoint pen, as described above, in the state where the pen tip portion protrudes from the tip opening of the shaft tube, the ball of the pen tip portion is rubbed against the cloth of the pocket or the like, or rotated. Since the viscosity of the shear-thinning ink existing in the pen tip portion is reduced by capillary attraction of the fabric or the like, there is a remarkable penetration into the fabric.

Therefore, in a retractable ballpoint pen that contains low-viscosity ink or shear-thinning ink in an ink storage cylinder, the pen tip portion is immersed from the tip opening of the shaft cylinder when inserted into a pocket or the like. A safety mechanism has been provided as disclosed in Japanese Patent Application Laid-Open No. 10-264582 “Knock-type writing instrument” and Japanese Patent Application Laid-Open No. 2001-105785 “Knock-type writing instrument”.
JP-A-10-264582 JP 2001-105785 A

  However, if such a safety mechanism is provided, a safety mechanism will be added to the conventional intrusion mechanism, resulting in a complicated structure and an increase in the number of parts. Had a problem that was difficult.

  By the way, in the retractable writing instrument, the retracting operation of the pen tip portion is performed by directly viewing the pen tip at the tip of the shaft tube or visually recognizing the position of the operating body. However, there is an urgent need for an in / out type writing instrument that allows the user to confirm the in / out operation without checking such a part.

  The object of the present invention is to allow the present inventor to follow the conventional retracting mechanism in the retractable writing instrument in view of the above problems, and the pen tip state of the pen tip from the tip opening of the shaft tube, and the pen tip It is to provide a retractable writing instrument with a simple structure in which the retractable motion of the object can be easily visually confirmed.

In order to solve the above problems, the present invention attaches a writing body in which a pen tip portion is mounted directly or via a holder to the tip end portion of an ink containing cylinder in the direction of the rear end of the shaft cylinder by a coil spring. In the retractable writing instrument provided with a retracting mechanism that can be slidably arranged and operated by operating the operating body, the pen tip portion of the writing body can protrude from the opening at the tip of the shaft tube . On the side wall on the end side , a plurality of window portions that can be visually recognized in the shaft cylinder made of a through hole or a transparent portion are formed at different positions in the axial direction, and the pen tip portion is immersed in the shaft tube. In the state, it is positioned rearward in the axial direction with respect to the window portion located closest to the rear end side of the shaft cylinder, and is visible from all the window portions of the plurality of window portions in a state where the pen tip portion protrudes. The display unit is integrated with the operation body or linked to the operation of the operation body, Rutotomoni provided member to post moving, the barrel rear end, characterized in that a appendage to discoloration or erase handwriting.

  In addition, the ink storage cylinder is visible from the window with the pen tip portion immersed, and the brightness difference between the outer surface of the ink storage cylinder and the display section is 30 or more. It is characterized by.

  In addition, the ink containing cylinder is visible from the window portion with the pen tip portion immersed, and the color of the ink containing cylinder and the color around the window portion formed in the shaft cylinder are substantially the same color. It is characterized by being.

  Moreover, the length along the axial center direction of the front end of the window portion located closest to the front end of the axial tube and the rear end of the window portion positioned closest to the rear end side of the axial tube among the plurality of window portions is set. It is substantially the same as the pressing or sliding distance of the operating body.

  According to the configuration of the first aspect of the present invention, in the retractable writing instrument, a plurality of window portions that can visually recognize the inside of the shaft tube formed of the through hole or the transparent portion are formed in the shaft tube at different positions in the axial direction. In the state where the pen tip portion is immersed in the shaft tube, the pen tip portion is positioned rearward in the axial direction than the window portion located on the rearmost end side of the shaft tube, and the pen tip portion protrudes. A display part that is visible from a window part located on the most distal end side of the shaft cylinder among the plurality of window parts, or a member that moves back and forth in the shaft cylinder that is integrated with the operation body or interlocked with the operation of the operation body By providing, the position of the pen tip can be confirmed by the window portion, and it is possible to suppress erroneous storage in a pocket or a pencil case with the pen tip protruding. In addition, from the pen tip immersive state to the protrusion, the window portion located closest to the rear end of the shaft cylinder among the plurality of window portions can be sequentially viewed from the tip end of the shaft cylinder, and the pen tip protrudes. It can be confirmed by the window.

  In addition, the window portion of the present invention is printed or colored in a through-hole that communicates the inside and outside of an opaque shaft cylinder whose interior is not visible, or on the outer wall or inner wall of a transparent shaft cylinder, the interior of which is not visible except for the window portion. Etc. can be provided. Moreover, the transparent part which can visually recognize the inside of a window part should just be a thing which can visually recognize a display part from the outside in natural light, and may be colorless and transparent or colored and transparent. When the window is made of a transparent resin, the light transmittance is preferably 70% or more, and preferably 80% or more.

  The display unit may be provided by molding with a resin colored in advance, or by applying paint or an adhesive seal to the molded member. Further, the color of the display unit is not particularly limited, but it is preferable that the display unit is easily visible from the window portion of the above-described shaft cylinder, and in order to improve the visibility, it is preferable to use white or fluorescent color with high brightness. In addition, the display unit may be provided in a different color as a whole or a part of the member attached to the operation body or capable of being interlocked with the operation body. However, in consideration of productivity, the entire member may be the same color. preferable.

  The member that can be moved back and forth in the shaft cylinder that is integrated with the operation body or interlocked with the operation of the operation body is, for example, a pressing portion that directly presses the rear end of the ink storage cylinder in the retracting mechanism, or the ink storage The rotating cam or sliding cam in the structure having a rotating cam disposed behind the cylinder and a sliding cam that presses the rotating cam, or an ink containing cylinder or the like accommodated in the shaft cylinder It is.

  According to the configuration of claim 2 of the present invention, in the state where the pen tip portion is immersed, the ink containing cylinder is visible from the window portion, and in the state where the pen tip portion is immersed, the window portion By making the difference in brightness between the outer surface of the ink container visible from the window and the display part 30 or more, the difference in brightness between the ink container visible from the window and the color of the display part can be increased. It is preferable because it is easy to check when the pen tip is immersed and protruding. Specifically, when the lightness difference ΔL is smaller than 30, the difference between the ink containing cylinder and the display unit is reduced, and as a result, the display function of the display unit is lowered. Therefore, the lightness difference is 30 or more, more preferably 50. The above is preferable. The lightness can be measured with a spectrocolorimeter (Minolta Co., Ltd., CM-512m2).

  According to the configuration of claim 3 of the present invention, in the state where the pen tip portion is immersed, the ink containing cylinder is visible from the window portion, and in the state where the pen tip portion is immersed, the window portion By making the color of the ink storage cylinder visible from the color and the color around the window portion of the shaft cylinder substantially the same color, the ink storage cylinder visible from the window section when the pen tip portion is immersed in the shaft cylinder and When the shaft cylinder is assimilated, the presence of the window portion in the state where the ink storage cylinder is located becomes thin, and in the state where the pen tip portion protrudes, the display portion appears to be positioned at the window portion, so that the pen tip protrudes And it is preferable because it can be changed to the color of the display part only by the movement of the pen tip part, and it becomes easier to visually recognize.

  The present invention is an in / out type writing tool that can follow the conventional in / out mechanism, and the in / out state of the pen tip from the tip opening of the shaft tube and the in / out operation of the pen tip can be easily visually confirmed. The writing instrument could be provided with a simple structure.

It is an external view which shows the state which the pen point part of the retractable type writing instrument of Example 1 protruded. FIG. 2 is an external view showing a state in which a pen tip portion in FIG. 1 is immersed in a shaft cylinder. It is a longitudinal cross-sectional view in FIG. It is a figure which shows the state from which the nib part of the retractable writing instrument of Example 1 protrudes. It is a figure which shows the state which uses the friction part in FIG.

  In FIGS. 1-3, the retractable writing instrument 1 of Example 1 is shown. The retractable writing instrument 1 has a writing body 12 accommodated in a shaft body obtained by screwing a black opaque front shaft 2 and a rear shaft 3 in a direction toward the rear end of the rear shaft 3 by a coil spring 11. It is slidably biased and accommodated. The intruding mechanism has a pressing portion 5a that is integrally provided with a clip 5 that is an operating body that protrudes outward from the rear shaft 3, and slides the clip 5 in the direction of the front end opening 2a of the front shaft 2. Thus, a conventional retracting mechanism using a rotating cam composed of a rotating cam 6 and a push rod 7 is operated so that a pen tip portion composed of a ballpoint pen tip 15 can be projected and retracted from the front end opening 2a of the front shaft 2. . A grip 10 is attached to the front shaft 2.

  The writing body 12 is mounted with a pen tip portion composed of a ballpoint pen tip 15 holding a φ0.7 mm ball rotatably on the tip end portion of the ink containing cylinder 13 via a chip holder 14. A tail plug 17 is attached to the rear end. The ink container 13 contains a reversible thermochromic microcapsule pigment having an average particle size of 5 μm, and the ink viscosity at 1 rpm in an EM type rotational viscometer is 1020 mPa · s (25 ° C.) at 100 rpm. The ink viscosity of the ink is 84 mPa · s (25 ° C.) and the shear thinning index is 0.48. . The ink viscosity is preferably 40 to 200 mPa · s at 100 rpm and 20 ° C. in an EM type rotational viscometer.

  The ball-point pen tip 15 has 25% of the ball diameter, the caulking angle is 110 degrees, and the vertical clearance of the ball is 50 μm when the ball protrudes from the tip end of the ball placed on the bottom wall. . Further, a coil spring 16 is disposed behind the ball, and the ball is pressed toward the seal surface by the pressing force. The pressing force of the coil spring that presses the ball is 15 gf.

  The rear shaft 3 is formed of a colorless and transparent PC resin, and a black opaque film having substantially the same color as the ink containing cylinder 13 is transferred to the rear shaft except for the window portion 4. The surface of the window portion 4 has a quadrangular shape, and is formed intermittently at three positions (4A, 4B, 4C) at appropriate intervals in different axial directions. The window 4 is formed on the left and right side walls with the clip 5 interposed therebetween.

  In order to write with this cursive body 12, as shown in FIG. 4, the clip 5 is resisted against the urging force of the coil spring 11 while the ballpoint pen tip 15 is immersed from the front end opening 2 a of the front shaft 2. When sliding in the direction of the tip opening 2a of the shaft 2 (in the direction of arrow F), the pressing portion 5a, the push rod 7 and the rotating cam 6 formed integrally with the clip 5 are operated, and the tip of the ball-point pen tip 15 is projected. By maintaining the rotation of the ball and the writing pressure, it is possible to write by discharging ink by causing the ball to move toward the bottom wall side by the clearance in the vertical direction and creating a gap between the tip of the tip and the ball. . The entire rotating cam 6 is colored in fluorescent yellow and the entire rotating cam 6 is used as a display unit.

  At this time, the display portion composed of the rotating cam 6 colored in fluorescent yellow is located behind the window portion 4C located closest to the rear end side of the shaft cylinder when the ball-point pen tip 15 is immersed in the front shaft 2. In conjunction with the above-described clip operation 5 and the protruding operation of the tip of the ball-point pen tip 15, it moves and rotates along the cam groove (not shown) toward the tip opening 2a of the front shaft 2. Further, the rotating cam 6 is sequentially interlocked with the movement of the clip 5 and the ball-point pen tip 15 from the window portion 4C located closest to the rear end of the shaft tube to the central window portion 4B and the window portion 4A located closest to the tip end of the shaft tube. When the tip of the ball-point pen tip 15 protrudes, the rotary cam 6 can be viewed from all the window portions 4 (4A, 4B, 4C). In this embodiment, since the rear shaft 3 is black and the rotating cam 6 is fluorescent yellow, the brightness difference between the two is large, and the rotating cam 6 serving as the display portion from the window portion 4 is easily visible. It was.

  In addition, when the ball-point pen tip 15 is immersed in the front shaft 2, the ink containing cylinder 13 colored in black is visually recognized from all the window portions 4 (4A, 4B, 4C). The lightness difference ΔL of the ink containing cylinder 13 and the rotating cam 7 serving as a display portion was set to 50 as measured by a spectrocolorimeter (manufactured by Minolta Co., Ltd., CM-512m2).

  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, and the friction portion 9 is pressed against the writing surface 20 and heat generated by rubbing. Can change the handwriting color.

  Further, the length L along the axial center direction between the front end of the window portion 4A located closest to the front end of the shaft cylinder in the window portion 4 and the rear end of the window portion 4C located closest to the rear end side of the shaft cylinder. Is substantially the same as the slide distance M of the clip necessary to protrude the tip of the ball-point pen tip 15, and the slide distance of the clip can be confirmed in appearance, thereby suppressing inadvertent pressing or sliding operation. be able to.

  Further, the windows 4A, 4B, 4C of the present embodiment are all rectangular, and from the window 4C located on the rearmost end side of the shaft tube to the window portion 4B in the center, the window located on the front end side of the shaft tube. The portion 4A is formed so as to increase in size, and the protrusion of the ball-point pen tip 15 makes it possible to visually recognize the display, and the protruding state of the pen tip portion is easily visible with the largest 4A.

  Although not shown in the drawing, the thickness of the shaft tube in the three window portions 4 (4A, 4B, 4C) is reduced toward the tip of the shaft tube, and different light transmittances are directed toward the tip of the shaft tube. It is preferable to increase the light transmittance toward the tip of the shaft tube while forming the window portion to be formed. Compared to the light transmittance on the rear end side of the shaft cylinder with a thick window part, the window part on the tip side of the shaft cylinder with a thin window part can increase the light transmittance. Can be made easier. The light transmittance is the light transmittance of a transparent plastic, which can be measured according to ASTM D 1003. By the thickness of the window or the transfer or coloring of a transparent or translucent film to the window surface. Can be changed.

  In the present embodiment, for the sake of convenience, a slide-type retractable ballpoint pen with a rotating cam is illustrated, but an operation body is provided at the rear end of the shaft tube and the side surface of the shaft tube, and by pressing and rotating the operation body, Knock type, such as a mechanism that causes the pen tip part to protrude from the front end opening of the shaft cylinder, or a mechanism that causes the pen tip part to protrude from the front end opening of the shaft cylinder by sliding an operating body made of a clip provided on the shaft cylinder Although not particularly limited, such as a slide type or a rotary type, a retracting mechanism using a rotating cam is most preferable in consideration of operability and durability.

  Also, the ink for writing instruments is not particularly limited, but the ink contains a pigment having an average particle size of 0.1 to 30 μm, and the ball has a longitudinal clearance of 30 to 80 μm per 100 m. When the consumption is 200 to 800 mg, a dark and good handwriting and a good writing feeling can be obtained. This is an ink whose ink consumption per 100 m is 200 to 800 mg in a water-based ink for writing instruments having a pigment with an average particle size of 0.1 to 30 μm when the longitudinal clearance of the ball is less than 30 μm. This is because it is difficult to increase the amount of consumption, and when it exceeds 80 μm, the amount of ink consumption is large and the handwriting drying property may be lowered, so that it is most preferably 30 to 80 μm. However, since such a writing instrument is easily contaminated when stored in a pocket or the like with the pen tip protruding, the effect of the present invention is remarkable.

  In the retractable ballpoint pen, two types of functions are available: writing with the cursive handwriting and discoloration and erasing with the attached part by providing an attached part for changing or erasing the handwriting, such as a friction part that thermally changes the handwriting, at the rear end of the barrel This is preferable because it can be a retractable writing instrument. In addition, when using the attachment provided at the rear end of the barrel with the pen tip protruding, the pen tip that protrudes when the writing tool with the pen tip facing the writing surface is rotated and changed. However, with the retractable writing instrument according to the present invention, it is possible to make the pen tip appear and retract by providing a window on the rear end side of the shaft cylinder that is located close to the accessory. Since the state can be confirmed, it is possible to suppress the occurrence of such problems. In the embodiment, for the sake of convenience, an attachment portion including a friction portion is provided, but an attachment portion for erasing writing or handwriting may be provided at the rear end portion of the shaft tube.

  Since the retractable writing instrument of the present invention can be used without being limited to the retracting mechanism and the ink used, it can be widely used as an retractable writing instrument.

DESCRIPTION OF SYMBOLS 1 Retractable writing instrument 2 Front shaft 2a Front opening 3 Rear shaft 4 Window portion 4A First window portion 4B Second window portion 4C Third window portion 5 Clip 5a Pressing portion 6 Rotating cam (display portion)
DESCRIPTION OF SYMBOLS 7 Push rod 8 Tail 9 Friction part 10 Grip 11 Coil spring 12 Writing body 13 Ink storage cylinder 14 Tip holder 15 Ball-point pen tip 16 Coil spring 17 Tail plug 18 Ink for writing instrument 19 Ink follower 20 Writing surface

Claims (4)

A writing body in which the pen tip is mounted directly or via a holder at the tip of the ink containing cylinder is slidably arranged in the shaft cylinder by being biased toward the rear end of the shaft cylinder by a coil spring. In the retractable writing instrument provided with a retractable mechanism capable of projecting the pen tip portion of the writing body from the opening of the axial tube tip, a through hole or a transparent portion is formed on the side wall on the rear end side of the axial tube. A plurality of window portions that can be visually recognized in the shaft cylinder are formed at different positions in the axial direction, and the pen tip portion is immersed in the shaft cylinder, and is positioned on the rearmost end side of the shaft cylinder. A display unit that is positioned rearward in the axial direction than the window unit that is visible and that is visible from all the window units of the plurality of window units in a state in which the pen tip portion protrudes is integrated with the operation body or operated. in conjunction with the operation of the body, provided on a member to move back and forth the shaft within the cylinder Rutotomoni, wherein The cylindrical rear portion, retractable writing instrument is characterized by providing an accessory unit for discoloration or erase handwriting. The ink containing cylinder is visible from the window with the pen nib portion immersed, and the brightness difference between the outer surface of the ink containing cylinder and the brightness of the display section is 30 or more. The retractable writing instrument according to claim 1. In a state where the pen tip portion is immersed, the ink containing cylinder is visible from the window portion, and the color of the ink containing cylinder and the color around the window portion formed in the shaft cylinder are substantially the same color. The retractable writing instrument according to claim 1 or 2, characterized in that Of the plurality of windows, the length along the axial direction of the tip of the window located closest to the tip end of the barrel and the rear end of the window located closest to the tip end of the barrel is The retractable writing instrument according to any one of claims 1 to 3, wherein the writing tool is substantially equivalent to a pressing or sliding distance of the operating body.

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