JP2013043367A - Pressurization type ballpoint pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressurization type ballpoint pen that includes a ballpoint pen refill capable of being replenished with ink.SOLUTION: There is provided the pressurization type ballpoint pen such that an ink reservoir tube can be replenished with ink, and a pressurization mechanism is provided at a rear end of the ink reservoir tube and placed in operation by pressing a knock body arranged projecting from a barrel to pressurize the rear end of the ink reservoir tube. A wear resisting coating layer is provided on a surface of a ball and/or a surface of a bottom wall of a ball holding chamber. The pressurization mechanism comprises a sealing part which seals the rear end of the ink reservoir tube and a space chamber which communicates with the rear end of the ink reservoir tube and is closed, and compresses the space chamber as the knock body is moved forward to apply pressure to the rear end of the ink reservoir tube.

Description

  In the present invention, the ballpoint pen refill is detachably accommodated in the shaft cylinder, a pressure mechanism is provided at the rear end portion of the ink containing cylinder, urged rearward by a coil spring, and protruded from the shaft cylinder. The present invention relates to a pressure-type ballpoint pen that presses the rear end portion of the ink storage cylinder by operating the pressure mechanism by pressing the knocked body.

  Conventionally, a ball-point pen refill that directly fills an ink storage cylinder with ink for a ball-point pen has been generally replaced by a ball-point pen refill when the filled ball-point pen ink has been used up, and is disclosed in Japanese Patent Laid-Open Publication No. Hei.

  In contrast to this ballpoint pen refill exchange type, fountain pens, marking pens, and the like are disclosed in Japanese Patent Application Laid-Open No. 8-156480, "writing instrument" as an ink replenishment type for replenishing ink in an ink tank.

JP-A-8-156480

  However, as described in Patent Document 2, in order to use a ballpoint refill in which an ink containing cylinder is directly filled with ink as an ink replenishment type, the tip body is worn due to the rotation of the ball during writing, so that stable ink consumption is achieved. In other words, there is a problem that the handwriting such as bleeding, blurring, and blurring is deteriorated, and if air is mixed during ink replenishment, a reverse flow phenomenon occurs.

  An object of the present invention is to provide a pressure ballpoint pen provided with a ballpoint refill that can be refilled with ink.

  In the present invention, a ball is placed on the bottom wall of the ball holding chamber at the tip of the ink containing cylinder, and the tip of the tip is crimped inward so that a part of the ball protrudes from the tip of the tip and is rotatable. A ball-point pen chip held in a ball holder is mounted directly or via a chip holder, and a ball-point pen refill directly filled with ink for ball-point pen is detachably stored in the shaft cylinder. In addition, the ink can be replenished, and a pressure mechanism is provided at the rear end portion of the ink containing cylinder, urged rearward by a coil spring, and by pressing a knocking body arranged protruding from the shaft cylinder, A pressure-type ballpoint pen that activates the pressure mechanism to pressurize the rear end of the ink container, and is provided with a wear-resistant coating layer on the surface of the ball and / or the bottom wall surface of the ball holding chamber. And the pressurizing mechanism includes a sealed portion that seals the rear end portion of the ink containing cylinder and a closed space chamber that communicates with the rear end portion of the ink containing cylinder, and the advancement of the knock body The space chamber is compressed, and pressure is applied to the rear end portion of the ink storage cylinder.

  Further, the pressure is applied to the rear end portion of the ink containing cylinder in a state where the ball-point pen tip is immersed in the shaft cylinder.

  Further, the volume of compressing the space chamber in the rear end portion of the sealed ink storage cylinder by the advancement of the knock body is larger than the volume of the ballpoint pen ink that is directly filled in the ink storage cylinder. Features.

  Further, an ink end display portion is provided in the ink containing cylinder, and the ink end display portion can be visually recognized through a visual recognition portion formed in the shaft cylinder.

  According to the configuration of claim 1 of the present invention, by providing a wear-resistant coating layer on the surface of the ball and / or the surface of the bottom wall of the ball holding chamber, wear of the chip body due to writing is prevented, The pressurizing mechanism includes a sealed portion that seals the rear end portion of the ink containing cylinder, and a closed space chamber that communicates with the rear end portion of the ink containing cylinder. By compressing the space chamber in the rear end portion of the sealed ink storage tube and applying pressure to the rear end portion of the ink storage tube, it is possible to refill the ink storage tube with ink and use a ballpoint refill. This is effective in preventing the occurrence of a back flow phenomenon even when air is mixed during ink replenishment.

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. A wear-resistant coating layer 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.

  Further, 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 such as stainless steel, copper alloy, aluminum, etc. Is not to be done.

  According to the configuration of claim 2 of the present invention, since pressure is applied in the rear end portion of the ink containing cylinder while the ball pen tip is immersed in the shaft cylinder, the ink for the ballpoint pen is applied to the ink containing cylinder. If it is arranged in the shaft cylinder after replenishing, the backflow phenomenon can be prevented.

  According to the configuration of claim 3 of the present invention, the volume for compressing the space chamber in the rear end portion of the sealed ink containing cylinder is directly filled in the ink containing cylinder by the advancement of the knock body. By making it larger than the volume of the ink for the ballpoint pen, the ink for the ballpoint pen replenished to the ink storage cylinder can be reliably supplied to the ballpoint pen tip.

  According to the configuration of claim 4 of the present invention, a ballpoint pen is provided by providing an ink end display portion on the ink containing cylinder and making the ink end display portion visible through a visual recognition portion formed on the shaft cylinder. It is possible to reliably grasp the end time of the ink for use, and to prevent the air from entering by replenishing the ink for the ballpoint pen before the rear end of the ink enters the ballpoint pen tip.

  According to the configuration of claim 4 of the present invention, a ballpoint pen is provided by providing an ink end display portion on the ink containing cylinder and making the ink end display portion visible through a visual recognition portion formed on the shaft cylinder. It is possible to reliably grasp the end time of the ink for use, and to prevent the air from entering by replenishing the ink for the ballpoint pen before the rear end of the ink enters the ballpoint pen tip.

  According to the present invention, it is possible to provide a knock-type writing instrument with a simple structure in which the locking portion of the knock body is easily disposed in the sliding hole of the shaft tube and is not easily detached.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a pressure ballpoint pen of Example 1. It is a figure which shows the state which the ball-point pen tip in FIG. 1 protruded. It is a principal part expanded sectional view of the ball-point pen refill in FIG. It is the principal part expanded sectional view in which a part of ball-point pen tip in Drawing 1 was omitted.

  Next, examples of the shaft cylinder of the writing instrument of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.

Example 1
A pressure type ballpoint pen 1 shown in FIG. 1 to FIG. 4 constitutes a shaft cylinder body by screwing a front shaft 2 and a rear shaft 3, and a ball pen refill 11 disposed in the shaft cylinder body is placed in the piston 5. The piston 5 is detachably press-fitted and attached via the ballpoint pen refill holding member 9, and the coil 5 is arranged between the coil spring receiving members 25 and 26 via the coil spring receiving member 25 on the rear end side of the shaft cylinder. The ballpoint pen refill holding member 9, the ballpoint pen refill 11, and the cylinder 6 are slidably disposed by being urged toward the rear end of the rear shaft 3. This is a pressure ballpoint pen 1.

  The mechanism of the ballpoint pen tip 12 of the ballpoint pen refill 11 is known in the art. When the knock body 4 is pressed in the direction of the tip opening 2a of the front shaft 2 (in the direction of arrow F in FIG. 1), the rear shaft 3 A locking portion 4 c formed on the outer wall of the knock body 4 slidably disposed in the sliding hole 3 a is locked to the locked portion 10 a at the tip of the clip 10, so that the ball-point pen tip 12 of the ball-point refill is held. When the state of protruding from the front end opening 2a of the front shaft 2 is maintained, the rear end portion of the clip 10 is pressed, and the locking portion 4c locked to the locked portion 10a of the clip is released, the coil spring 16 This is a retracting mechanism that allows the ballpoint pen tip 13 of the ballpoint pen refill 11 to be retracted into the front end opening 2a of the front shaft 2 by the urging force.

The ballpoint pen refill 11 has a ballpoint pen tip 13 having a ball 20 rotatably held at the tip of the ink containing cylinder 12, and has an ink viscosity of 8000 mPa at 20 ° C. and a shear rate of 3.8 sec ⁻¹ (10 rpm).・ It is directly filled with ink K for Newtonian oil ballpoint pen, which is s.

  The ball-point pen tip 13 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 a ball holding chamber 15, an ink circulation hole 19, and an ink circulation groove extending radially from the ink circulation hole 19. 17 is formed, a substantially circular arc-shaped ball seat 18 is formed on the bottom wall 16 of the ball holding chamber 15, and the surface of the ball seat 18 is made of a surface layer portion of diamond-like carbon (DLC) in advance. A wear-resistant coating layer S is coated. Thereafter, the ball 20 is placed on the ball seat 18 and the tip end portion 14a of the tip body 14 is caulked inward.

  Further, a substantially arc-shaped seal surface 14b is formed on the inner wall of the tip end portion 14a, and the surface of the seal surface 14b is preliminarily coated with a lubricating coating layer S composed of a surface layer portion of diamond-like carbon (DLC). It is provided.

  Specifically, the ball protruding from the tip end of the ball 20 placed on the ball seat 18 is 30.0% of the ball diameter, the caulking angle α is 93 degrees, and the tip of the seal surface 14b. The inner diameter of the edge is 95.4% of the ball diameter, the vertical clearance of the ball 20 is 20 μm, the inner diameter of the ball holding chamber 15 is 110.0% of the ball diameter, and the diameter of the ball seat 18 is the ball diameter. Of 95.0%.

  The rear end portion of the ball-point pen refill 11 is press-fitted and held by a ball-point refill holding member 9 that is press-fitted into the piston 5, and the inside and outside of the piston 5 communicate with each other through an air hole 5 a formed in the rear end portion of the piston 5. In addition, a cylinder 6 having a closed rear end is disposed so as to cover the piston 5, and an outer wall step portion 5 b formed on the outer wall of the piston 5 abuts on a front end surface 6 a of the cylinder 6, and is interlocked with the cylinder 6. The piston 5 is disposed so as to be movable in the direction of the front end opening 2a of the front shaft 2. A spring 27 is disposed between the piston 5 and the knock body 4, and the knock body 4 is always urged toward the rear end of the rear shaft 3.

  The pressurizing mechanism and the retracting mechanism will be described in detail. When the knock body 4 is pressed from the position where the ballpoint pen tip 13 is retracted, the tip surface 6a of the cylinder 6 is in contact with the outer wall step portion 5b of the piston 5 until the inner surface of the cylinder 6 is in contact. By compressing the space portion, the outer wall surface of the piston 5 and the inner wall surface 6c of the cylinder 6 are slidably sealed with each other by the O-ring 7, so that the space portion in the piston 5 is also compressed. Further pressure can be applied to the rear end of the refill 11. It should be noted that the volume of the space that is compressed by pressing the knock body is larger than the volume of ink in the ballpoint pen refill.

  Further, when the knock body 4 is advanced in the direction of the tip opening 2 a of the front shaft 2, the piston 5 and the ballpoint pen refill 11 are advanced through the cylinder 6, and the locking portion 4 c formed on the outer wall of the knock body 4 is connected to the clip 10. It is possible to maintain the pressurized state and the state in which the ball-point pen tip 12 of the ball-point pen refill 11 protrudes from the front-end opening 2 a of the front shaft 2.

  Further, when the locking portion 4 c locked to the locked portion 10 a of the clip 10 is released, first, the knock body 4 is retracted toward the rear end of the rear shaft 3 by the urging force of the spring 15. At this time, the cylinder 6 also moves backward together with the knock body 4 toward the rear end of the rear shaft 3.

  Further, the urging force of the coil spring 14 causes the piston 5, the ballpoint pen refill 11, and the cylinder 6 to retreat in the rear end direction of the rear shaft 3, and the ballpoint pen tip 13 of the ballpoint pen refill 11 is immersed from the front end opening 2 a of the front shaft 2. A pressurizing mechanism and a retracting mechanism.

  The ink storage cylinder 12 is provided with an ink end display portion 12A, and the ink end display portion H can be visually recognized through a visual recognition portion in which the front shaft 2 is made transparent. When the ballpoint pen ink reaches the ink end display portion H by writing, the ballpoint pen refill 11 is removed, and a new ballpoint pen ink (not shown) is replenished from the rear end opening portion 12a of the ink containing cylinder 12, and again. It can be attached to the ballpoint pen holding member 9 for writing.

  In order to mount the ballpoint pen refill, the rear end portion of the ballpoint pen refill 11 is started to press into the ballpoint pen refill holding member 9, and the rear end portion of the ink containing cylinder 12, the space in the piston 5 and the cylinder 6 are sealed. Further, when the rear end portion of the ballpoint pen refill 11 is pushed and moved in the longitudinal direction and the mounting of the ballpoint pen refill 11 on the ballpoint pen refill holding member 9 is completed, the movement distance in the longitudinal direction from the start of press-fitting to the end of the mounting is reduced. Then, pressure is applied to the rear end portion of the ink containing cylinder 12.

  In this embodiment, for the sake of convenience, the locking portion 4 c formed on the outer wall of the knock body 4 is locked to the locked portion 10 a at the distal end portion of the clip 10, and the ball-point pen tip 12 of the ballpoint pen refill is attached to the front shaft 2. When the state of protruding from the front end opening 2a is maintained, the rear end portion of the clip 10 is pressed, and the locking portion 4c locked to the locked portion 10a of the clip is released, the biasing force of the coil spring 16 causes Although a retracting mechanism for retracting the ballpoint pen tip 12 of the ballpoint pen refill 11 into the tip opening 2a of the front shaft 2 is used, a retracting mechanism such as a rotary cam type is not limited.

Further, in this example, oil ballpoint ink which is a Newtonian ink is used, but it is not particularly limited, such as oily ink or water-based ink imparted with shear thinning, correction liquid, glue, etc. When the viscosity at 10,000 ° C. and a shear rate of 3.8 sec ⁻¹ (10 rpm) exceeds 10,000 mPa · s, the writing quality is lowered, so that it is 10000 mPa · s or less, preferably 8000 mPa · s or less. Moreover, since it will be easy to generate | occur | produce from a chip | tip tip if it is less than 100 mPa * s, it is most preferable to set it as 100 mPa * s or more and 10000 mPa * s or less.

  In order to suppress ink leakage from the tip of the tip, it is most preferable to provide a seal surface on the inner wall of the tip of the tip and to provide a wear-resistant coating layer on the surface of the seal surface. Although not shown, it is preferable to fit a tail plug provided with a valve mechanism that is normally closed and opened by pressure from the rear of the ink storage cylinder at the rear end of the ink storage cylinder.

  The pressure ballpoint pen of the present invention is not limited to ink or a retracting mechanism, and can be widely used as a pressure ballpoint pen.

DESCRIPTION OF SYMBOLS 1 Pressure type ball-point pen 2 Front shaft 2a Front opening 3 Rear shaft 3a Step part 4 Knock body 4a Fitting protrusion 4b Locking part 4c Front end surface 5 Piston 5a Air hole 6 Cylinder 6a Fitting hole 6b Rear end surface 6c Inner wall surface 7 One sealing portion 8 Second sealing portion 9 Coil spring 10 Clip 10a Locking portion 11 Ball pen refill 12 Ink receiving cylinder 13 Ball pen tip 14 Tip body 14a Tip tip portion 14b Sealing surface 15 Ball holding chamber 16 Bottom wall 17 Ink flow groove 18 Ball seat 19 Ink flow hole 21 Spring receiving member 22 Second coil spring 23 Third coil spring 24 O-ring 25, 26 Coil spring receiving member 27 Spring 28 Coil spring 29 Second coil spring H Ink end display portion

Claims (4)

The ball was placed on the bottom wall of the ball holding chamber at the tip of the ink containing cylinder, and the tip of the tip was crimped inward, so that a part of the ball protruded from the tip tip edge and was held freely. A ball-point pen tip is mounted directly or via a chip holder, and a ball-point refill filled with ball-point pen ink directly in the ink storage cylinder is detachably stored in the shaft cylinder, and ink is supplied to the ink storage cylinder. The pressurizing mechanism is provided by providing a pressurizing mechanism at the rear end portion of the ink containing cylinder, energizing it backward by a coil spring, and pressing a knocking body arranged to protrude from the shaft cylinder. And a pressure-type ballpoint pen that pressurizes the rear end of the ink containing cylinder, and is provided with a wear-resistant coating layer on the surface of the ball and / or the surface of the bottom wall of the ball holding chamber. The pressurizing mechanism includes a sealed portion that seals the rear end portion of the ink containing cylinder, and a closed space chamber that communicates with the rear end portion of the ink containing cylinder. A pressure-type ballpoint pen that compresses a space chamber and applies pressure to a rear end portion of the ink storage cylinder. 2. The pressure ballpoint pen according to claim 1, wherein pressure is applied to a rear end portion of the ink storage cylinder in a state where the ballpoint pen tip is immersed in the shaft cylinder. 3. The volume of compressing the space chamber in the rear end portion of the sealed ink containing cylinder by the advancement of the knock body is larger than the volume of the ballpoint pen ink that is directly filled in the ink containing cylinder. The pressure ballpoint pen according to claim 1 or 2. The ink end display part is provided in the ink storage cylinder, and the ink end display part is made visible through a visual recognition part formed in the shaft cylinder. The pressure type ball-point pen of description.

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