JP2005007863A - Retractable writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of recovery from ink interruption and a deterioration in pressurization efficiency in a retractable writing utensil using a ball point pen and the like, which is likely to cause an interruption of ink in initial writing, and a retouching ball point pen, which has no need to conduct agitation and has no need to conduct troublesome work of pressing of the side of the vessel. <P>SOLUTION: This retractable writing utensil includes a refill 22 of a ball point pen comprising a chip 24 at its front end and an ink receipt tube 28 at its rear part. Ink is contained in the ink receipt tube 28, and a follower 30, which follows up ink as the ink is consumed, is provided in the rear end of the ink. A knock mechanism part is provided so that the refill is mounted and the chip can be locked in such a state that the front end of the chip appears from the front of the knock mechanism part. A pressurization mechanism part is provided between the rear end of the refill and the front end of the knock mechanism part. The pressurization mechanism part is provided with a rear end closed pressure cylindrical part 11. A pressure shaft part 32, which is slid against the pressurization cylindrical part through a spring 25, is provided in its inner hole. Knocking is carried out to lock the chip front end part in a projected state, and the pressurization cyclindrical part advances to press the rear end of the rear end to assist the flow of the ink toward the chip. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a ballpoint pen that uses ink that is easy to run out of ink during initial writing, a ballpoint pen in which various fillers are mixed in the ink, a ballpoint pen that is filled with ink that can be easily erased by rubbing the handwriting written on the paper with an eraser, The present invention relates to a pressure-type ballpoint pen such as a ballpoint pen that can be corrected by concealing an error or the like with white ink.

JP-A-8-52407 7-506862 JP 2001-121885 A JP-A-2001-205980 (Patent Document 1) Conventionally, a liquid applicator using a white pigment has been known in order to correct errors and the like. In addition, since the white pigment and the solvent can be easily separated, this type of liquid applicator has a flexible container filled with ink, balls, and the like, and needs to be shaken and stirred in use. Further, the ink is ejected by pressing the side surface of the container. However, when the remaining amount of ink decreases, there is annoyance that the ink is not ejected even if the side wall of the container is strongly pressed. (Patent Document 2) In addition, there is a known ink that does not need to be agitated by using ink having shear thinning viscosity, but there is a problem that the ink tends to run out due to backflow when applied upward. (Patent Document 3) Further, a pumping type pressurizing mechanism is provided at the rear end of the shaft cylinder, and air is pushed into the rear end hole of the ballpoint pen refill by the pumping forward operation, and the rear end of the follower is pressurized. In addition, there has been proposed one configured to support the fluidity of the ink toward the tip side. This is disadvantageous in that the pressurizing effect does not last because it is the same as the outside air when the pusher is released from the forward movement. In addition, there is a problem that the pressurizing effect is not sufficient because the pressure is retreated from the pressurized state with the influence of depressurization. In addition, a pressurized gas is sealed on the rear end side in the ink storage tube after ink filling, and by using the internal pressure by the sealing of the pressurized gas, upward writing of the ballpoint pen is possible, and in the ink storage tube There has been proposed a pressurized ballpoint pen which prevents ink leakage due to the reverse flow phenomenon of ink. However, in such a pressurized ballpoint pen, the cost increases due to the pressurized gas sealed in the ink containing tube, and the manufacturing equipment is complicated, so that not only the productivity is inferior, but also the internal pressure decreases with time. In order to prevent this, strict management is also required for the pressure, the material of each assembly part, and the sealability of the assembly site. (Patent Document 4) Furthermore, a ballpoint pen that uses ink that is easy to break ink in the initial writing, a knock that becomes the basis of the present invention, equipped with a refill of a ballpoint pen that can be corrected mainly by concealing misprints etc. with white ink An expression writing instrument has been proposed. This can be provided at a low cost, but when the pressure cylinder is moved backward from the advanced state, the pressure inside the pressure cylinder acts on the side where the pressure is reduced, so that the ink flows backward. There is a possibility that ink may run out at the writing tip due to the influence of the side, and there is a problem that the ink running out is recovered and the pressure efficiency is impaired.

In general, ballpoint pens that use low viscosity ink or ink with shear thinning viscosity have a large ink outflow (in order to increase writing density), and the diameter of the ink containing tube is increased to increase the amount of ink loaded. . Further, since the viscosity of the ink is smaller than that of the oil-based ballpoint pen, the flow resistance with respect to the ink containing tube is small. Therefore, ink leakage (ink flows backward at the rear end of the ink containing tube) is likely to occur due to the weight of the ink, dropping or knocking impact. For this purpose, the ink usually moves following the ink consumption at the time of writing at the trailing edge of the ink, but a grease-like follower that suppresses the back flow of the ink against the ink's own weight or impact is also available. A rod is provided immersed in the follower. However, even if the follower is provided, when writing is performed upward, if the ink on the back side of the ball of the chip runs out, the ink head is added directly, so that there is a risk of causing a significant back flow and soiling hands and clothes. In addition, since the viscosity of the ink is low and the amount of outflow is large, there is a problem that the ink oozes out (direct current) when a gap is formed between the tip ball and the tip holding portion when the tip side is faced downward.
In particular, in the case of liquid applicators that use white pigments to correct errors, etc., the tip ball retracts due to pen pressure due to reasons such as increasing the ink flow rate and eliminating clogging caused by drying. The clearance between the peripheral surface of the tip ball and the inner surface of the ball holding portion of the chip is large.

  The present invention has been made in view of the above-described prior art. A ballpoint pen using ink that is easy to break ink in initial writing, a ballpoint pen in which various fillers are mixed in ink, and a handwriting written on a paper surface is abraded with an eraser. A ballpoint pen filled with ink that can be easily erased by the above, a knock-type writing instrument equipped with a refill such as a ballpoint pen that can be corrected by concealing misprints etc. with white ink, mainly without the need for stirring It is possible to provide a ballpoint pen for correcting mistakes and the like without pressing the side surface of the container at a low cost, and the pressure cylinder portion is decompressed when the pressure cylinder portion is moved backward from the advanced state. The ink is affected by the backflow side to act on the ink-sinking side and induces ink shortage at the tip of the writing. Easily resolvable and the Nau problem.

The present invention has the following configuration in order to achieve the above-described problems.
The knock type writing instrument according to the invention of claim 1 includes a tip of a ball-point pen at the tip and an ink storage tube at the rear, and prevents ink from evaporating from the ink and the ink at the rear end of the ink and with consumption of the ink. In a refill of a ballpoint pen provided with a follower that follows ink, and a knock-type writing instrument having a knock mechanism portion that mounts the refill so that the tip of the tip can be locked in and out from the tip. Between the rear end and the front end of the knock mechanism part, a pressure cylinder part with a closed rear end, and a pressure shaft part that slides against the pressure cylinder part via a spring in its inner hole are provided and pressurized. The mechanism portion is configured, knocked and locked in a state where the tip end portion protrudes, and the pressurizing cylinder portion is advanced with respect to the pressurizing shaft portion, and the rear end of the refill follower is pressurized. Made, the ink chip Assisted flowability to the side, to allow preventing the occurrence of recovery and ink out of the ink out.

  The knock type writing instrument according to a second aspect of the present invention is the knock type writing instrument according to the first aspect, wherein a circumferential concave groove portion is provided on an outer periphery of the pressure shaft portion, and a seal is provided in the concave groove portion. When the ring is tightly inserted so that it can move back and forth, and the pressure cylinder moves forward with respect to the pressure shaft, the seal ring is moved toward the front end in the groove and the front and rear parts of the seal ring cannot be vented. As a result of further advancement, the inner periphery of the pressurizing cylinder part slides in close contact with the outer peripheral part of the seal ring, so that the air in the pressurization cylinder part is pushed into the axial center hole of the pressurizing shaft part. In addition, when the pressure cylinder part is moved backward from the state where the pressure cylinder part is moved forward with respect to the pressure shaft part, the seal ring is moved toward the rear end side in the groove part and the front and rear parts of the seal ring can be ventilated. The pressure cylinder portion can be retracted while being communicated with the outside air.

  A knock type writing instrument according to a third aspect of the invention is the knock type writing instrument according to the second aspect, wherein a circumferential concave groove portion is added to the outer periphery of the pressure shaft portion and a front end side in the concave groove portion is added. An air passage that communicates with a hole that penetrates the shaft center of the pressure shaft is provided, the seal ring is moved toward the front end in the groove, the air passage is closed, and the seal ring is in the rear end in the groove And the air passage is opened.

  A knock type writing instrument according to a fourth aspect of the present invention is the knock type writing instrument according to the second aspect, wherein a circumferential concave groove portion on the outer periphery of the pressure shaft portion and a rear end side in the concave groove portion are provided. A ventilation groove is formed at a required location, the ventilation groove is closed when the seal ring is moved to the front end side in the concave groove portion, and the ventilation groove is opened when the seal ring is moved to the rear end side in the concave groove portion It becomes a state.

  When the knock type writing instrument of the present invention is moved backward from the state in which the pressure cylinder part is advanced, the pressure cylinder part acts on the side to be depressurized, so that the ink is influenced by the reverse flow side, and the writing tip part is The problem of inducing ink outage and losing ink outage and impairing pressure efficiency can be easily solved even if there are variations in the seal material, etc. Includes ballpoint pens containing various fillers, ballpoint pens filled with ink that can be easily erased by rubbing the handwriting written on the paper with an eraser, and white pigments such as titanium oxide and polymer hollow fine particles and gelling agents. In addition, the sedimentation of the pigment is prevented and there is no problem that the white pigment and the solvent are separated from each other. Therefore, there is no need to stir the ink, and the side of the container is pushed when writing. It no such that, knock-type writing instrument, such as a good clerical error correcting ballpoint pen with no further troublesome cap detachable usability is possible to provide without problems.

1 to 11 show an embodiment of the present invention.
First, FIG. 1 thru | or FIG. 3 has shown the state which mounted the refill 22 of the ball-point pen in the knock-type writing instrument in the accommodation state in the writing front-end | tip part.
The shaft tube 1 is provided with a notch 2 at the rear end to form a stepped end A3 and an end B4, a short window portion 5 is drilled at a predetermined position on the side, and a front end which will be described later. A joint portion 6 that allows the shaft 18 to be attached and detached is provided. The joint portion 6 is selected depending on the design convenience such as a screw portion or an engagement portion that elastically joins each other. In addition, if it is not necessary to replace the refill, it is also possible to provide a front shaft integrally with the tip of the shaft cylinder.

  Further, the knock bar 7 has a smooth inner peripheral portion 11a toward the rear at the front end opening portion, and a pressure cylinder portion 11 whose rear end is closed by the partition wall portion 9, and behind the pressure cylinder portion 11. A long hole portion 10 penetrating in a rectangular shape in a direction perpendicular to the axis and a shaft portion 8 are integrally connected to the rear end of the long hole portion 10. Furthermore, partition portions 13a and 14a are integrally formed at two locations near the front side of the long hole portion 10 on the one open side, and a step portion A13 on which a tip lock portion of a pine nut described later is locked at each rear end, and A step B14 is provided. Further, a locking portion 12 which is a ridge or a circumferential protrusion is provided on the peripheral surface of the front end inner hole portion of the pressure cylinder portion 11.

  Further, the locking member 15 (commonly called “Matsuba” or the like) has a plate-like shape and has a forked leg portion toward the front, and the leg portion on the upper end side extends in the expanding direction with respect to the leg portion on the lower end side. In addition, it has a push button 16 projecting upward substantially in the middle of the leg portion on the upper end side, and a locking portion 17 is provided at the front end of the leg portion. Yes.

A locking member 15 is inserted into the long hole portion 10 of the knock bar 7, and the locking member 15 is connected to the rear of the shaft cylinder 1 together with the knock bar 7 in a state where the leg portion on the upper end side is elastically deformed axially. When the push button 16 is inserted from the end hole and protrudes into the window portion 5 of the shaft tube, the locking member 15 is fixed to the shaft tube 1. At that time, the lower part of the front end of the lower end side leg portion of the locking member 15 abuts against the lower wall surface of the inner hole of the shaft tube, and the upper end side leg portion is urged against the upper wall surface of the inner hole by the spreading action.
The knock mechanism portion formed by the combination of the knock bar 7 and the locking member 15 has a structure well known as a Matsuba type knock mechanism.

  In addition, the knock mechanism is composed of a knock bar and a rotor (a mechanism used for a knock-type ballpoint pen or the like for projecting and retracting the writing tip) from the rear end side, and a pressure mechanism is arranged in front of the rotor. It is possible to set up. Furthermore, it is also possible to provide a pressure cylinder part (details of this part will be described later) integrally in front of the rotor.

By the way, the pressurizing mechanism section is provided so as to slide back and forth with respect to the pressurizing cylinder section through a spring in the inner end hole thereof, and a pressurizing cylinder section having a closed rear end provided at the front end of the knock mechanism section. And a pressurizing shaft portion.
The pressurizing shaft portion 32 is formed with a circumferential concave groove portion 35a on the outer periphery of the rear shaft portion 35 behind the flange portion 34, and a step portion 37 is formed in the inner hole at the upper end portion of the concave groove portion 35a. A small hole 35b (air passage) is provided on the front end side of 35a from the vent 36 opened to the stepped portion 37 to the hole passing through the axial center of the pressurizing shaft portion 32, and further in the concave groove portion 35a. A seal ring 38 made of an elastic material such as rubber is closely inserted, and the seal ring 38 can be moved back and forth with respect to the groove 35a.
In addition, when a seal portion 33a having a circumferential protrusion is formed at a required location on the outer periphery of the front shaft portion 33 in front of the collar portion 34, and the refill described later is mounted on the outer periphery of the front shaft portion 33, the refill ink It closes in an airtight manner on the inner surface of the receiving tube 28.

  As described above, the pressure shaft portion 32 is inserted into the inner hole of the pressure cylinder portion 11 with the spring 39 laid between the step portion 37 and the closed inner hole end of the pressure cylinder portion 11, The flange portion 34 of the pressure shaft portion is elastically engaged with the locking portion 12 which is a protrusion provided on the peripheral surface of the front end inner hole portion of the pressure cylinder portion 11 or a circumferential protrusion, and pressurization is performed. The shaft portion 32 is always urged forward by the pressing force of the spring 39 and cannot be pulled out. Further, a notch groove 34 a is provided at a required location on the outer periphery of the flange portion 34, and the front and rear of the flange portion 34 can be vented to the outside of the pressurizing cylinder portion 11 by the notch groove 34 a. Note that the means for engaging the pressure cylinder part and the pressure shaft part, and the ventilation means for allowing the front and rear of the collar part to be vented to the outside of the pressure cylinder part by the notch groove are not limited to the above embodiment. .

In addition, an intermediate engaging portion 11c that is also a protrusion or a circumferential protrusion is provided on the peripheral surface of the inner hole portion of the pressurizing cylinder portion 11 at an appropriate rear side of the locking portion 12, and further, Similarly, a rear engaging portion 11d is provided behind the engaging portion 11c.
As shown in FIG. 2, the seal ring 38 is close to the rear end side of the recessed groove portion 35a, and the engaging portion 11c is substantially in contact with the edge of the seal ring 38 on the rear end side. Is located.
When the pressurizing cylinder portion 11 is moved forward with respect to the pressurizing shaft portion 32, the engaging portion 11c pushes the edge on the rear end side of the seal ring 38 to force the seal ring 38 to the front end side in the concave groove portion 35a. As a result, the small hole 35b (ventilation passage) is closed, and further advancement of the pressurizing cylinder 11 advances the engaging portion 11c over the outer periphery of the seal ring 38, and the outer periphery of the seal ring 38 is added. By sliding in close contact with the inner peripheral portion of the inner hole of the pressure cylinder part 11, the air in the pressure cylinder part 11 is pushed into the axial center hole of the pressure shaft part 32. (Refer to FIG. 5) Further, when the pressurizing cylinder portion 11 is moved backward from the pressurizing shaft portion 32 with respect to the pressurizing shaft portion 32, the engaging portion 11c comes into contact with the seal ring 38, and the seal ring 38 is in the concave groove portion 35a. The air passage is opened toward the rear end side, and the inside of the pressurizing cylinder portion can be retracted while communicating with the outside air. (However, strictly speaking, the sliding interval until the engaging portion 11c abuts the seal ring 38 and the seal ring 38 approaches the rear end side of the concave groove portion 35a and the small hole 35b is opened acts in the pressure reducing direction. To do.)
By the way, the seal ring 38 is made of an elastic body such as rubber, an elastic molding resin, or the like, and one having good confidentiality and slipperiness is selected, and a lubricant is interposed. The operation will be described in detail.

  In the embodiment described above, a means for forcibly bringing the seal ring 38 toward the front end side or the rear end side in the concave groove portion 35a is taken, but the inner peripheral surface of the inner hole of the pressure cylinder portion 11 and the seal are taken. If the frictional resistance between the inner peripheral surface of the seal ring 38 and the peripheral surface of the concave groove portion 35a on the outer periphery of the pressing shaft portion 32 is set to be sufficiently small with respect to the frictional resistance between the outer peripheral surface of the ring 38 and the friction, It is possible to use resistance. In that case, if necessary, a material with a small friction coefficient is selected for the pressure shaft portion or the concave groove portion 35a, or the outer surface of the seal ring is soft and the inner surface is a hard two-layer structure. A process for reducing frictional resistance is performed on the peripheral surface of the groove. Basically, the seal ring may be loosely fitted in the groove portion except for the state where the seal ring is close to the front end side of the concave groove portion (the small hole is closed).

10 and 11 show an embodiment in which another ventilation means is provided.
In this embodiment, a ventilation groove 35c is formed at a position close to the rear end side of the recessed groove portion 35a. In the state shown in FIG. 10, the seal ring 38 is close to the rear end side of the recessed groove portion 35a, and the engaging portion 11c is substantially in contact with the edge of the seal ring 38 on the rear end side. Is located. In this state, the front and rear of the seal ring 38 communicate with each other through the ventilation groove 35c. When the pressurizing cylinder portion 11 is moved forward with respect to the pressurizing shaft portion 32, the engaging portion 11c pushes the edge on the rear end side of the seal ring 38 to force the seal ring 38 to the front end side in the concave groove portion 35a. When the pressure cylinder 11 is further moved forward, the outer periphery of the seal ring 38 slides in close contact with the inner periphery of the inner hole of the pressure cylinder 11, and the pressure cylinder 11 The inside air is pushed into the axial center hole of the pressurizing shaft portion 32. (Refer to FIG. 11) Further, when the pressurizing cylinder portion 11 is moved backward from the pressurizing shaft portion 32 with respect to the pressurizing shaft portion 32, the seal ring 38 is moved toward the rear end side in the concave groove portion 35a and the air passage is opened. In this state, the inside of the pressurizing cylinder portion can be retracted while communicating with the outside air.

Here, the refill of the ballpoint pen will be described.
As shown in FIG. 9, the ink containing tube 28 of the refill 22 of the ballpoint pen is filled with, for example, a white pigment ink 29 for correcting typographical errors. The follower 30 is filled. Further, the follower is not compatible with ink and has a performance of preventing ink evaporation.
Further, if necessary, a resin-made follower rod 31 having a specific gravity substantially equal to that of the follower is immersed in the follower. The follower may be a follower such as silicon rubber.

The ink 29 used in the present invention is an oil-based ink or a water-based pigment ink that can be easily separated by initial writing. For example, a white pigment ink containing titanium oxide used as a correction liquid can also be used. In this case, the viscosity of the ink is preferably 1000 mPa · s or less at a shear rate of 400 / s and 300 mPa · s or more at 5 / s in an atmosphere at 25 ° C.
Also, the white pigment ink contains a gelling agent in a white pigment such as titanium oxide or polymer hollow fine particles and has shear thinning to prevent sedimentation of the pigment and prevent fluidity from being lost as much as possible. The blended white pigment ink can be obtained, and can be applied with high concealability in combination with the decrease in viscosity due to rotation of the tip ball during writing.

  As shown in the figure, the joint 23 is formed with a front shaft portion 23a in front of the flange portion 23b and a rear shaft portion 23c in the rear, and holds the tip ball 26 in the tip fitting hole 23d at the front end of the front shaft portion 23a. The shaft portion 24a of the chip 24 is fixed. The tip 24 is crimped so that the tip ball 26 is rotatably held in a state where the tip ball 26 is substantially in contact with a seat having a channel through which ink can flow. Further, a spring 25 is inserted into the inner hole portion of the tip 24, and the rear end of the tip shaft portion 24a is properly crimped so that the rear end of the spring 25 cannot be removed.

  Further, a straight rod shaft portion 25 a is formed in front of the spring 25, and the tip of the rod shaft portion 25 a is in contact with the back surface of the tip ball 26 in a pressed state. Further, the tip ball 26 is in close contact with the inner edge of the ball holding portion (formed by caulking or the like) of the chip 24 by the pressing. In addition, it is possible to provide a pressing member for pressing the back surface of the tip ball 26 on the front surface of the spring, and it is also possible to form the rod shaft portion in a coil shape with a very thin winding. Furthermore, the tip can be made of a resin molded product with excellent wear resistance and ink sealing performance, and the spring seat that presses the back of the tip ball can be configured as an integral or separate spring seat. is there.

Further, it is extremely important for the tip ball 26 to be in close contact with the inner surface of the ball holding portion for drying the writing tip and preventing direct current of the ink even if the ink has a high viscosity.
That is, in the ballpoint pen mainly for correcting correction of writing as in the present application, in order to increase the amount of ink discharged, the size of the tip ball to recede is set larger than that of the ballpoint pen for writing. In addition, the surface roughness of the inner surface of the chip holding the tip ball 26, the grinding finish of the inner surface to improve the caulking accuracy, and secondary plastic processing to increase the caulking accuracy are taken into consideration as necessary. The In addition, surface treatment or the like is considered on the contact surface with the tip ball if necessary.

Further, a valve chamber 23e that is appropriately eccentric with the axis of the tip 24 is provided behind the tip fitting hole 23d, and a tapered or spherical valve body that communicates with the guide hole 23h at the rear of the valve chamber 23e. A receiving seat 23f is formed. A groove 23g through which ink can flow is formed on one side of the inner wall of the valve chamber 23e.
In addition, a spherical valve body 27 is loosely fitted in the valve chamber 23e, and the valve body 27 comes into contact with a state of being biased to the rear end of the shaft portion 24a of the chip with the chip 24 facing downward, and the groove section The ink that flows in from the guide hole 23h through 23g or the like is configured to flow into the chip inner hole. The valve body may be a shaft-shaped body having a tapered or spherical surface on the side close to the valve body seat. In this case, it is not necessary to decenter the valve chamber with respect to the tip axis as described above by forming a groove into which ink flows into the tip on the peripheral surface of the tip that contacts the rear end of the tip portion. . Various forms of ink backflow prevention structures using valve bodies have been proposed.

In addition, a rear shaft portion 23c extends behind the collar portion 23b of the joint 23, and a cylindrical ink containing tube 28 is in contact with the rear end of the collar portion 23b on the outer periphery of the rear shaft portion 23c. It is press-fit. For example, a transparent PP resin molded product or the like is used for the ink containing tube 28. Further, in the embodiment, the joint and the ink storage tube are formed as separate members, but it is also possible to form both of them as an integral resin molded product.
The refill 22 is configured as described above.

Next, the structure which mounts the refill 22 on a knock type writing instrument is demonstrated.
As shown in FIGS. 1 to 3, the refill 22 is attached by tightly fitting the rear end of the ink containing tube 28 to the outer periphery of the front shaft portion 33 of the pressure shaft portion 32, and the step portion 23 j of the refill joint 23. A return spring 40 is provided between the inner shaft portion 19 of the front shaft 18, and the front shaft 18 is fixed to the front side of the shaft tube 1 in a state where the refill 22 is urged rearward with respect to the front shaft 18. This state shows a state in which the knock type writing instrument in which the pen tip is accommodated in the tip end 21 of the front shaft is stored or carried.

  The urging force of the spring 39 used in the pressurizing mechanism described above is set to be appropriately larger than the urging force of the return spring 40 until the writing tip portion is locked in a state of protruding from the tip opening 21. The spring 39 is set so as not to be substantially compressed and displaced, and as shown in FIG. 2, the inside of the pressurizing cylinder is in communication with the outside air.

(Function)
That is, the pressurizing cylinder portion 11 advances with respect to the pressurizing shaft portion 32 in a state where the advancement of the refill 22 is blocked, and immediately after the pressurizing cylinder portion 11 is appropriately advanced, the seal ring 38 is connected to the pressurizing shaft portion. The small hole 35b is closed to block the inside of the pressure cylinder 11 from outside air, and the space 11b in the pressure cylinder is reduced and pressurized.
First, FIG. 1 thru | or FIG. 3 shows the time of storage and carrying of a knock type writing instrument. From this state, when the knock bar 7 is knocked forward to the end A3 of the rear end of the shaft cylinder and the knock is released, the locking part 17 at the front end of the locking member 15 becomes the step part of the knock bar as shown in FIGS. Lock to A13. At that time, as shown in FIG. 6, the refill 22 moves forward, and the pen tip (tip 24) protrudes from the tip end 21 to be in a writing state.

  That is, the step portion 23i of the joint 23 abuts on the tip inner step portion 20 provided on the tip shaft 18 to prevent the refill 22 from moving forward, the inside of the pressure cylinder portion is blocked from the outside air, and the space portion in the pressure cylinder portion. 11b is reduced by a small stroke, and the rear end of the follower 30 is pressurized to support the fluidity of the ink toward the tip side. That is, it prevents the ink from separating from the peripheral surface of the tip ball due to a drop impact or poor ink fluidity and prevents the continuous outflow of ink and recovers when interrupted. Become. This is the first knocking means.

Further, when the knock bar 7 is knocked forward to the end B4 at the rear end of the shaft cylinder and the knock is released, as shown in FIGS. 7 and 8, the locking part 17 at the tip of the locking member 15 becomes the step part B14 of the knock bar. Lock to. In addition, the space 11b in the pressure cylinder is reduced by a large stroke, and the rear end of the follower 30 is in a pressurized state, and when the ink breakage is severe (strong) or the ink remaining amount in the ink containing tube is reduced. Sometimes the fluidity of the ink to the tip side is supported. In this state, by repeatedly knocking and releasing the rear end of the knock bar 7 to the same surface as the end portion A3 of the rear end of the shaft cylinder, a pressure wave is applied to the rear end of the follower 30 to further flow the ink toward the chip side. Sex is supported.
This is the second knocking means.

Further, in order to release the locking state between the stepped portion of the knock bar 7 and the locking portion 17 of the locking member 15, it is possible to press the push button 16 in the axial direction of the shaft tube 1.
In the state of FIG. 8, the engaging portion 11d is substantially in contact with the edge on the front end side of the seal ring 38, and when the locking portion 17 is released, the pressure cylinder portion 11 is retracted, The engaging portion 11d forcibly brings the seal ring 38 toward the rear end of the concave groove portion 35a of the pressurizing shaft portion, the small hole 35b opens, and the pressurizing cylinder portion 11 moves backward while communicating with the outside air. It returns to the state shown in FIG.

  As described above, the seal ring 38 is made of an elastic body such as rubber, an elastic molding resin, or the like, and is selected to have good confidentiality and slipperiness. Between the inner peripheral surface of the seal ring 38 and the peripheral surface of the concave groove portion 35a on the outer periphery of the pressure shaft portion 32 against the frictional resistance between the inner peripheral surface of the inner hole of the pressure cylinder portion 11 and the outer peripheral surface of the seal ring 38. When the frictional resistance is set to be small, it is not always necessary to provide the engaging portion 11c and the engaging portion 11d on the inner peripheral portion 11b of the pressure cylinder portion 11. In order to place the seal ring 38 under such conditions, a material having a small friction coefficient is selected for the pressure shaft portion or the concave groove portion 35a, or the seal ring has a two-layer structure in which the outer surface is soft and the inner surface is hard. The inner surface of the seal ring and the peripheral surface of the groove are subjected to a process for reducing frictional resistance. Basically, the seal ring may be loosely fitted in the groove portion except for the state where the seal ring is close to the front end side of the concave groove portion (the small hole is closed).

  However, the inner peripheral surface of the seal ring 38 and the pressurizing shaft portion against the frictional resistance between the inner peripheral surface of the inner hole of the pressurizing cylinder portion 11 and the outer peripheral surface of the seal ring 38, including causes such as variations in members. 32, when the frictional resistance between the outer peripheral concave groove portion 35a and the peripheral surface of the concave groove portion 35a is increased, the engaging portion 11c and the engaging portion 11d are attached to the inner peripheral portion 11b of the pressure cylinder portion 11 as described above. It is necessary to provide it. When this engaging portion is provided, the frictional resistance between the inner peripheral surface of the seal ring 38 for opening or closing the small hole 35b and the peripheral surface of the concave groove portion 35a on the outer periphery of the pressing shaft portion 32 is reduced. What is necessary is just to provide so that the force with which the engaging part 11c and the engaging part 11d engage with the edge of the edge part of the seal ring 38 may become large with respect to the maximum value. The actual protrusion of the engaging portion is very small and is smaller than the contact area of the seal ring, and the outer periphery of the seal ring can be overcome without hindering the close contact of the seal ring.

  As shown in FIG. 5, when the knock rod 7 is knocked to the same surface as the end A3 of the rear end of the barrel and the knock operation is released, the knock rod is slightly retracted and the locking member 15 is moved. The distal end locking portion 17 is locked to the step A13 of the knock bar. Therefore, the inner peripheral surface of the seal ring 38 is pressed against the frictional resistance between the inner peripheral surface of the inner hole of the pressurizing cylinder portion 11 and the outer peripheral surface of the seal ring 38. When the frictional resistance between the outer periphery of the shaft portion 32 and the concave groove portion 35a is set to be small, the play seal ring 38 moves backward, but even in that case, the closed state of the small hole 35a is maintained. Thus, a dimensional relationship can be provided. However, the inner peripheral surface of the seal ring 38 and the peripheral surface of the concave groove portion 35a on the outer periphery of the pressurizing shaft portion 32 against the frictional resistance between the inner peripheral surface of the inner hole of the pressurizing cylinder portion 11 and the outer peripheral surface of the seal ring 38. This consideration is not necessary when the frictional resistance between the two is large.

Furthermore, when the push button 16 of the locking member 15 is pressed in the axial direction of the shaft tube 1 from the state shown in FIG. 5, the engaging portion 11c comes into contact with the seal ring 38, and the seal ring 38 is formed in the concave groove portion 35a. The sliding interval until the small hole 35b is opened toward the rear end side acts in the pressure reducing direction. The pressure reduction in this case may not be negligible, and as a solution, a third engagement portion may be provided at a position where the seal ring 38 is substantially in contact with the edge on the front end side. That is, the number of engaging portions is not limited to two in the embodiment, and may be three or more. For example, by providing an infinite number of engaging portions having minute protrusions formed circumferentially at minute intervals. It is possible to deal with it. This means that when the pressurizing cylinder portion 11 moves forward with respect to the pressurizing shaft portion 32, the seal ring 38 acts so as to be brought closer to the front end side with respect to the concave groove portion 35a of the pressurizing shaft portion. When the pressure cylinder part 11 moves backward with respect to the shaft part 32, the seal ring 38 acts so as to be moved toward the rear end side with respect to the concave groove part 35a of the pressure shaft part.
As described above, the means for providing the engaging portion on the inner peripheral surface of the pressure cylinder portion can be easily set with respect to the mechanism expected for the difference in the frictional force between the inner periphery and the outer periphery of the seal ring. .

Next, the basic function of the refill 22 will be described.
First, in a state where writing is not performed, the tip ball 26 is brought into close contact with the inner edge of the chip holding portion by pressing of the spring 25, so that direct current and backflow of the ink 29 are prevented.
Further, since the tip ball 26 is slightly retracted by the writing pressure, a gap is formed so that the ink can flow out, and the ink is written by the rotation of the tip ball 26 by writing. By the way, in the state where the tip 24 is directed upward, the valve element 27 is in close contact with the valve element receiving seat 23f and seals the guide hole 23h. Therefore, even if the ink on the back surface of the tip ball 26 disappears by upward writing, the ink does not flow backward. Therefore, when the chip 24 is turned downward, the ink can immediately flow out and ink breakage is suppressed. By the way, in the structure having no valve body, the ink head acts in the reverse flow direction when writing upward, so that there is a problem that the ink does not follow immediately when writing down by drawing air into the chip. There is also a problem that air entrainment is gradually accumulated by repeated upward writing.

  The follower bar 31 is used when the ink containing portion has a large diameter. That is, the grease-like follower 30 has a problem that it is easily damaged by deformation due to impact or the like when the ink containing tube has a large diameter. It is possible to increase the rigidity by immersing a resin-made follower rod having a specific gravity substantially equal to that of the follower in the follower.

  In addition, since the tip ball 26 is always in close contact with the inner edge of the ball holding portion, writing tipping is prevented by drying the tip portion. In addition, the joint action of the tip ball 26 and the valve element 27 reduces air entrainment even when an upward writing or impact is applied, so that ink breakage is prevented. Further, although direct current and reverse flow of the ink are effected by pressing the tip ball 26 by the spring 25, the intimate contact with the tip ball 26 due to processing variation of the ball holding portion, the ball holding portion and the tip ball 26 In order to prevent the ink from flowing backward by supporting a large head of ink, and to alleviate air entrainment, the solid incomplete state when solid matter adheres to the gap of the ink is supplemented.

  The ink backflow prevention structure with the follower bar and valve body described above demonstrates the performance when the ink container has a large diameter and is easy to backflow, when repeated upward writing, or when an impact is applied. It is not essential as a component, and in particular, a ballpoint pen for correcting errors is rarely used because it is rarely used upward.

It is a longitudinal cross-sectional view which shows the second half part of the knock type writing instrument of this invention, and respond | corresponds to the state where the writing front-end | tip part was immersed from the front-end | tip opening | mouth of a front axis | shaft. It is the figure which expanded the principal part in FIG. It is the longitudinal cross-sectional view of a partial non-section which showed the state where the writing front-end | tip part corresponding to FIG. 1 was immersed from the front-end | tip opening | mouth of a front axis | shaft. It is a longitudinal cross-sectional view which shows the second half part of the knock type writing instrument knocked at the rear end to be in the first knock state, and corresponds to a state in which the writing tip protrudes from the tip end of the front shaft. It is the figure which expanded the principal part in FIG. It is the longitudinal cross-sectional view which showed the state which the writing front-end | tip part protruded from the front-end | tip opening | mouth of the front axis. It is a longitudinal cross-sectional view which shows the second half part of the knock type writing instrument which knocked the rear end and was made into the 2nd knock state. It is the figure which expanded the principal part in FIG. It is a longitudinal cross-sectional view of a refill. An enlarged view of the main part of the latter half of the knock-type writing instrument corresponding to the state where the writing tip is immersed from the tip end of the front shaft, and an embodiment in which a ventilation means different from the above is provided in the seal ring part. It is shown. It is a longitudinal cross-sectional view which shows the latter half principal part of the knock type writing instrument which knocked the rear end from the state shown in FIG. 10, and was set to the 2nd knock state.

Explanation of symbols

1 Shaft cylinder 2 Notch 3 End A
4 End B
5 Window part 6 Joint part 7 Knock stick 8 Shaft part 9 Partition part 10 Long hole part 11 Pressurizing cylinder part 11a Inner peripheral part 11b Space part 11c Engagement part 11d Engagement part 12 Engagement part 13 Step part A
13a Partition 14 Step B
14a Partition portion 15 Locking member 16 Push button 17 Locking portion 18 Front shaft 19 Inner step portion 20 Front inner step portion 21 Tip port 22 Refill 23 Joint 23a Front shaft portion 23b Hook portion 23c Rear shaft portion 23d Chip fitting hole 23e Valve chamber 23f Valve body receiving seat 23g Groove portion 23h Guide hole 23i Step portion 23j Step portion 24 Tip 24a Shaft portion 25 Spring 25a Rod shaft portion 26 Tip ball 27 Valve body 28 Ink containing tube 29 Ink 30 Follower 31 Follower rod 32 Pressure shaft Part 33 front shaft part 33a seal part 34 flange part 34a notch groove 35 rear shaft part 35a concave groove part 35b small hole 35c vent groove 36 vent hole 37 step part 38 seal ring 39 spring 40 return spring

Claims (4)

A ballpoint pen refill having a tip of a ballpoint pen at the tip and an ink storage tube at the rear, and a follower that prevents ink from evaporating at the rear end of the ink and follows the ink as the ink is consumed. In the knock-type writing instrument equipped with the knock mechanism that allows the tip of the tip to be locked in and out from the tip with the refill mounted,
Between the rear end of the refill and the front end of the knock mechanism, there is provided a pressure cylinder part having a closed rear end, and a pressure shaft part that slides against the pressure cylinder part via a spring in its inner hole. The pressurizing mechanism is configured, knocks and locks in a state where the tip end protrudes, and the pressurizing cylinder moves forward with respect to the pressurizing shaft, and the rear end of the refill follower is pressurized. A knock-type writing instrument characterized by being in a state and configured to support fluidity of ink toward the tip side.   When a circumferential concave groove is provided on the outer periphery of the pressure shaft portion, and the seal ring is closely inserted in the concave groove portion so as to move back and forth, and when the pressure cylinder portion moves forward with respect to the pressure shaft portion, The seal ring is brought close to the front end side in the groove, and the front and rear parts of the seal ring cannot be ventilated. By further advancement, the inner periphery of the pressure cylinder part is in close contact with the outer periphery of the seal ring. Then, the air in the pressurizing cylinder part is configured to be pushed into the axial center hole of the pressurizing shaft part, and when the pressurizing cylinder part moves backward from the state in which the pressurizing cylinder part advances, The seal ring is configured so that the seal ring is moved toward the rear end side in the recessed groove portion so that the front and rear portions of the seal ring can be ventilated, and the pressure cylinder portion can be retracted in communication with the outside air. Knock-type writing instrument.   A circumferential groove is provided on the outer periphery of the pressure shaft, and an air passage communicating with a hole penetrating the shaft center of the pressure shaft is provided on the front end side of the groove, and the seal ring is provided in the groove. The knock-type writing instrument according to claim 2, wherein the air passage is closed by being brought close to the front end side, and the seal ring is brought close to the rear end side in the recessed groove portion so that the air passage is opened. A ventilation groove is formed on the outer periphery of the pressure shaft at the circumferential groove and the required position on the rear end side of the groove, and the ventilation groove is closed when the seal ring is moved toward the front end in the groove. The knock type writing instrument according to claim 2, wherein the ventilation groove is opened when the seal ring is moved toward the rear end side in the concave groove portion.

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