JPH10264585A - Push-button type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a no-sealing cap required push-button type writing utensil, in which neither back-flowing phenomenon of ink nor direct flowing phenomenon of ink develops even when lowly viscous ink is charged and the drought resistance of the writing tip part is maintained. SOLUTION: In a push-button type writing utensil, in which the refill of a ball point pen is installed, a clip 21a, at the spherical projection of the tip of which an engaging surface 21b is formed, is provided at the rear of a shaft tube. On the other hand, a rotary cam mechanism part has a push-button rod 25, which moves forwards and backwards by means of a push-button operation, and a cam slope formed on the push-button rod and cam slopes formed at two axially projecting parts provided on the inner surface of the shaft tube. Further, a rotator 22 equipped with projected engaging parts 22b ahead the cam slopes composes the rotary cam mechanism together with the above-mentioned rod and cam slope. Through the advancement of the push-button rod accompanied by the push-button operation, the rotator pivots by the pressing action between the am slopes so as to engage of disengage an engaging part formed at the spherical projection of a clip with or from an engaging part provided on the rotator, resulting in extendably and retractaly engaging the writing tip part of the refill of a ballpoint pen through the tip port of the shaft tube. At the same time, when the spherical projection of the clip is displaced to the direction so as to part from the side face of the shaft tube, the engagement is released, resulting in allowing to retract the writing tip part from the tip port.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an ink storage section for directly storing ink without absorbing it into an ink storage body or the like.
In addition, when the air in the ink container expands due to a rise in temperature or the like, the ink ejected from the ink container is provided with an ink reservoir that temporarily stores the ink to prevent the ink from dropping from the tip ball or the ventilation groove. The present invention relates to a knock-type writing instrument in which a refill of a ball-point pen whose tip does not need to be sealed is mounted on a barrel, and a writing tip can be protruded and retracted from a tip of the barrel by a knocking operation of a knock part protruding from the rear end of the barrel.

[0002]

2. Description of the Related Art A low-viscosity ink such as an aqueous ballpoint pen has a low viscosity of several mPa · S or less, and therefore has an advantage that it can be written with a light writing pressure and has a good writing quality. However, there is a drawback that a DC phenomenon in which the ink flows slowly from the pen tip, and a reverse flow phenomenon in which the air flows in from the tip of the ballpoint pen and the ink flows out, are likely to occur. A method of preventing these phenomena by using a fiber convergence body (ink occluding body) called batting has been adopted. Further, there is known an ink storage device provided with an ink storage body for temporarily storing ink. Even with this ink reservoir, if the writing tip is not sealed, there is a problem that, over a long period of time, drying due to evaporation of the ink will result in short writing and short writing life.

[0003] The conventional knock-type ballpoint pen has a structure in which the writing body is protruded from the tip of the shaft to perform writing. Therefore, when the writing body is forgotten to be stored in a pocket, the writing portion protrudes off-axis. And soiled clothing with ink. In order to solve this problem, a device has been proposed in which a writing tool is always stored when a writing implement is inserted into a pocket by locking the clip with a locking portion provided on a shaft or a locking portion provided inside the shaft. As a mechanism, when the writing part of the cursive body is pushed out by pushing the knock bar at the rear end of the shaft from the front end of the shaft, the lock is released by pushing the rear end side of the clip when storing the cursive body. Generally, the one that stores cursive letters is generally adopted.In this case, however, the operability is not good because the operating unit is different between the case where the cursive letter is protruded and the case where it is stored, and the direct liquid type When the cursive is installed, the impact on the cursive at the time of release may cause the ink inside the cursive to shift, leak out, or cause the writing curl due to entraining air from the cursive tip. Because of this, there is a drawback that a mechanism for buffering the impact on the cursive is required.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, that is, to provide a ballpoint pen refill which does not require a seal cap and has an ink reservoir for temporarily storing ink. It is possible to provide a knock-type writing instrument. In addition, a mechanism that ensures that the writing tip protrudes and retracts reliably and has good operability is realized, preventing accidents that stain clothes when stored in the pocket, and reducing the number of parts to reduce cost and assembly. Solve the problem of
Further, the present invention responds to a request to reduce knock impact on cursive script.

[0005]

The present invention has the following arrangement to achieve the above object. That is, in the knock-type writing instrument according to the first aspect of the present invention, the ink guide core is densely mounted in the inner hole of the chip, and the joint and the ink reservoir are integrally provided in series behind the chip to accommodate the ink. The tube has a relatively large cross-sectional area and has a rear end closed and is non-deformable. The ink storage tube is filled with low-viscosity ink, and an ink reservoir is fitted into a front inner hole of the ink storage tube. The refill of the ballpoint pen and the rotating cam mechanism that is locked at the back and forth position with respect to the barrel by knocking operation at the rear of the barrel are disposed, and the return spring is urged forward by the return spring in front of the rotating cam mechanism. In the knock-type writing instrument provided with the refill of the ballpoint pen, a clip is provided on one side surface behind the barrel, a locking surface is formed on a ball portion at the tip, and the ball portion is appropriately The window to be inserted is a shaft On the other hand, a rotary cam mechanism is provided with a knock bar which moves back and forth by a knock operation, a cam slope provided on the knock bar, and a cam slope provided on the inner surface of the shaft cylinder. A cam slope is formed at a protruding portion at a location, and a rotor provided with a protruding locking portion in front of the cam slope, and a pushing action between the cam slopes by advancing of a knock rod accompanying a knocking operation. And the engaging portion provided on the rotor engages with or disengages from the engaging surface formed on the ball portion of the clip, and the writing tip of the refill of the ballpoint pen has the tip of the barrel. When the ball portion of the clip is displaced in a direction away from the side surface of the shaft cylinder in the engaged state, the engagement is released and the writing tip can be retracted from the tip opening.

According to a second aspect of the present invention, there is provided a knock-type writing instrument according to the first aspect, wherein the tip ball of the refill of the ball-point pen is always attached to the inner edge of the ball holding portion at the tip of the tip. It is provided so as to be pressed and brought into close contact, and the contact state is released at the time of writing, so that the tip end of the tip is not required to be sealed and can be mounted on the shaft cylinder.

According to a third aspect of the present invention, there is provided the knock-type writing instrument according to the second aspect, wherein when the writing pressure is applied to the back surface of the tip ball by the tip of the refill of the ball-point pen. A spring seat for pressing the back surface of the tip ball is provided at a required position so that the contacting ball receiving seat and the tip ball are in close contact with the inner edge of the ball holding portion. An ink inflow groove for supplying ink from the rear end of the chip to the tip ball is formed therebetween.

[0008]

First, FIGS. 12 to 14 show an embodiment of a ballpoint pen refill mounted on a knock-type writing instrument according to the present invention. The ink applied to the refill of a ballpoint pen is an aqueous or oily low-viscosity ink.

As shown in the figure, a ballpoint pen refill 1
The tip 11 is caulked so that the tip ball 13 is rotatably held with the tip ball 13 substantially in contact with the seat having the channel portion 17 into which ink can flow. (Ball holding part 11a)

Referring to FIG. 13 and FIG.
7, the ball receiving seat 17a is brought into contact with the tip 11 on the back surface of the tip ball 13 when pen pressure is applied.
And a spring seat 17b for pressing the back surface of the tip ball 13 so that the tip ball 13 comes into close contact with the inner edge of the ball holding portion 11a.
Are radially and alternately arranged, and an ink inflow groove 17c capable of supplying ink is formed between the arranged ball receiving seat 17a and the spring seat 17b.

The tip ball 13 is a ball holding portion 11a.
Close contact with the inner surface is extremely important for drying the writing tip and preventing direct current of ink. In this embodiment, the tip 11 is assumed to be a resin molded product having excellent spring properties, abrasion resistance and ink sealing performance. In order to improve the surface roughness of the inner surface of the chip holding the 13 and the closeness accuracy by caulking, grinding of the inner surface and secondary plastic working for increasing the caulking accuracy are considered. In addition, a surface treatment or the like is taken into consideration for the surface in close contact with the tip ball.

The joint 2 has a flange 7 behind the front shaft 3.
And an ink reservoir 5 having a plurality of retaining grooves 6 at the back further formed as an integral resin molded product. Also, the shaft portion 12 of the chip 11 is press-bonded to the inner hole portion 4 at the tip of the front shaft portion 3,
The ink reservoir 5 is firmly fixed to the front end hole of the ink storage tube 14. (The joint and the ink reservoir can also be provided by being connected by separate members.) Further, the first ink guide core 10 has a tapered tip in the inner hole of the tip 11 substantially on the back surface of the tip ball 13. A second ink guide core 9 is tightly packed in a contact state, connected to the rear end of the ink guide core 10, and is closely mounted in the center hole of the ink storage body 5, and the rear end is connected to the ink storage body 5. 5 is provided so as to protrude rearward of the rear end as appropriate.

Further, a ventilation groove 8 is provided at a required portion of the flange portion 7 which abuts on the front end of the ink storage tube 14 to exchange air with the outside air and the ink reservoir 5 and the ink storage tube 14. The air passage for air replacement has an effect on the loss of volatilization of the ink, and although it is simply shown in the figure, a narrow bypass air passage is desirable.

The ink storage tube 14 is filled with low-viscosity ink 16 at the rear of the ink reservoir 5. or,
A closing portion 15 is formed at the rear end of the ink storage tube 14. In addition, a transparent polypropylene resin molded product or the like is used for the ink storage tube 14 as an example. Also, the ink storage tube 14
Is selected with a material that has excellent clear drain properties. The ink container 14 has a relatively large diameter and is substantially non-deformed.

First, the barrel comprises a front shaft 23 and a rear shaft 20. In this knock-type writing instrument, the refill 1 of a ball-point pen is urged rearward by a return spring 26, and this force is transmitted to the rotor 22 and the knock bar 25, and is finally provided in the tube portion 21c of the clip tube 21. Received by the protrusion 21j. The clip cylinder 21 has a locking projection 21f formed at the rear end of a locking piece 21e provided on the side surface of the cylindrical portion 21c, and is locked by a locking window 20b provided on the rear shaft 20. Fixed to

FIG. 11 is a front view showing a part of the developed view of the rear shaft 20, the clip cylinder 21, the rotor 22, and the knock bar 25 and the position of the rotor 22 at that time, showing the flow of the rotary cam mechanism. Finally, in the order of A, B, C, and D, the state returns to the state of A again, and during this time, the writing section comes and goes once. The rotary cam mechanism will be described based on this. The rotor 22 is located between the knock bar 25 and the refill 1 of the ballpoint pen.
When the knock bar 25 is pressed, the force applied in the axial direction by the cam slope 25a of the knock bar 25 and the corresponding cam slope 22c of the rotor 22 is converted into a circumferential rotational force. Is done. At this time, the knock bar 25 is provided with a rotation stopper 25b, and the clip cylinder 21 is provided with a groove 21d corresponding to the rotation stopper 25b. Therefore, the knock bar 25 does not rotate in the circumferential direction. Only the rotor 22 is configured to rotate a predetermined angle in the circumferential direction.

In the initial stage of the knocking operation, the rotation is controlled by the cam side surface 22e of the rotor 22 and the cam side surface 20c of the rear shaft 20, and the rotor 22 does not rotate. The rotor 22 is disengaged and rotates by a predetermined angle. At this time, the rotor 22 is always urged rearward by the return spring 26 through the refill 1 of the ballpoint pen, and when the pressing on the knock bar 25 is stopped, the cam slope 22a of the rotor 22 and the corresponding rear shaft 20 The rotor 22 is further rotated by a predetermined angle by the cam slope 20a, and when the rotor 22 rotates by a certain angle, the protruding locking portion 22b of the rotor 22 is engaged with the locking surface 21b formed on the ball portion of the clip 21a. , Writing tip is tip 2
3 is projected.

Here, the time when the state changes from B to C in FIG. 11 will be described in detail. The cam slope 22a of the rotor 22 moves backward along the cam slope 20a of the rear shaft 20, and at the same time, the engagement of the rotor 22 increases. The stopping portion 22b also moves while drawing the same locus, but at this time, the locking portion 2 of the rotor 22
In order for 2b to engage with the locking surface 21b of the clip ball portion, it must be able to pass without interfering with the lower end surface of the side wall surface 21g of the clip ball portion. For this purpose, the distance R over which the cam slope 22a of the rotor 22 moves is set to be large,
The inclination angle θ of the cam slope 20a of the rear shaft 20 may be set to an obtuse angle. However, in the former method, the knock stroke becomes large, so that the operability is deteriorated. There is a possibility that the cam 20 stops on the cam slope 20a, so that the operation is not reliable. In order to solve this problem, the height may be set so that the locking portion 22b of the rotor 22 can pass through the lower end surface of the side wall surface 21g of the clip ball portion without interference. However, the other side wall surface 2
If the lower end surface of 1h is the same height as the lower end surface of the side wall surface 21g, the reliability of engagement is lost, so the lower end surface of the side wall surface 21h is large as long as it does not interfere with the outer diameter of the cylinder of the rotor 22. It is desirable to do. Further, the end face of the locking face 21b of the clip ball portion is formed by the lower end face of the side wall face 21g and the side face 21h.
By making the lower end face a slope or a curved surface that connects smoothly, the clip can be smoothly inserted and pulled out of clothes without being caught.

When the writing portion is pressed from the state where the writing portion protrudes from the front shaft 23, the knock bar 25 is pressed, and the cam slope 25a at the front end of the knock bar 25 and the cam slope 22c of the rotor 22 are engaged with each other, so that the locking surface 21b of the clip ball portion is engaged. And the locking part 2 of the rotor 22
The engagement with 2b is released. Here, when the pressing on the knock bar 25 is stopped, the cam slope 22a of the rotor 22 is retracted while rotating along the cam slope 20a of the rear shaft 20, and the writing tip is stored in the tip end of the front shaft 23. At this time, the rotor 22 is set at the same position as the initial state. That is, when the knock bar 25 is pressed again, the projecting operation is possible. Further, the projecting state can be released by pushing the ball portion of the clip 21a upward without pressing the knock bar 25, by the locking portion 22 of the rotor 22.
b is disengaged from the locking surface 21b of the clip ball portion, and the tip of the writing tip is the same as when the knock bar 25 is pressed.
3 is housed in the tip opening. For this reason, if it is attempted to insert the writing tip into the pocket with the writing tip protruding, it is possible to prevent accidents such as the writing tip being automatically stored and soiling the clothes. Knock rods, rotors, and cam slopes formed on the inner surface of the rear shaft required for these operations can be appropriately selected in shape, angle, and number of cams.

FIGS. 15 and 16 show another embodiment of the chip. As shown in the figure, the tip 30 is caulked so that the channel member 32 into which ink can flow is fixed, and the tip ball 31 is rotatably held with the tip ball 31 substantially abutting on its seat. . (Ball Holder 30a) To describe the channel member 32 in detail, the ball member 32a, which is in contact with the channel member 32 fixed to the rear surface of the tip ball 31 by the tip 30 when pen pressure is applied, is applied. And spring seats 32b for pressing the back surface of the tip ball 31 so that the tip ball 31 and the inner edge of the ball holding portion 30a come into close contact with each other, are arranged alternately in a radial pattern, and the ball receiving seat 32a and the spring seat 32b are provided. An ink inflow groove 32c that allows ink to be supplied to the tip ball 31 from the rear end of the chip 30 is formed between the ink inflow groove 32c and the tip 30. The tip 30 used for the refill of the ballpoint pen is assumed to be made of metal, and the channel member 32 is assumed to be made of resin or metal.

[0021]

First, an embodiment of a ballpoint pen refill will be described. Refill 1 of ballpoint pen is spring seat 1
When the tip 7b is pressed, the tip ball 13 becomes the ball holding portion 1 of the chip.
Since it is close to the inner edge of 1a, direct current of the ink and drying of the writing tip are prevented. In addition, the tip ball 13 is slightly retracted by the writing pressure, so that a gap is generated and ink can flow out. By writing, the rotation of the tip ball 13 allows the ink to flow out smoothly and writing with high handwriting density becomes possible.

On the other hand, by pressing a knock bar 25 projecting rearward from the rear shaft, the writing tip of the refill of the ballpoint pen is projected from the front end of the front shaft to enable writing. Locking surface 21b of clip ball portion provided on cylinder 21 and locking portion 22 of rotor 22
When the ball portion of the clip 21 a is lifted, the engagement is released and the writing tip is stored in the tip end of the tip shaft 23 because the writing tip can be held in a protruding state by engagement with the writing tip b. For this reason, even if the writing tip is inserted into the pocket while projecting from the tip of the tip shaft, the accident that the writing tip is automatically stored in the tip of the tip and stains the clothes with ink is prevented. be able to. The writing section can be protruded and stored only by pressing the knock bar, and the impact when storing the writing section can be considerably loosened by the finger in contact with the knock bar, which was not possible in the past. It is now possible to mount a ballpoint pen refill filled with low-viscosity ink. In addition, the locking portion of the rotor does not protrude outside the rear shaft, and since there is no protruding corner portion in the clip ball portion, it can be smoothly inserted and removed from a pocket, etc.
The knock stroke can be shortened, the operation reliability is improved, and the operability can be further improved.

[0023]

The construction and operation of the knock-type writing instrument according to the present invention are as described above. The pen is filled with low-viscosity ink so that the ink does not flow backward and does not have a direct current phenomenon. A refill of a ball-point pen that does not require a cap can be provided, and the function of a highly safe knock-type writing instrument having an effect of preventing an accident such as soiling of clothes by mounting the refill of the ball-point pen can be obtained. In addition, since the writing tip can be moved in and out only by the knocking operation, it is easy to use, and the structure is simple, so that it is easy to assemble and can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the overall structure of a knock type writing instrument according to an embodiment of the present invention.

FIG. 2 is a front view of a knock-type writing instrument. (The barrel is transparent and the inside is visible.)

FIG. 3 is an enlarged longitudinal sectional view showing a rear portion of the knock-type writing instrument according to the embodiment.

FIG. 4 is an enlarged longitudinal sectional view showing a front end portion of the knock-type writing instrument according to the embodiment.

FIG. 5 is a front view of a rear shaft. (Transparent)

FIG. 6 is a front view showing the appearance of a knock bar.

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a front view showing an appearance of a rotor.

FIG. 9 is a front view showing the appearance of the clip cylinder.

FIG. 10 is a side view of FIG. 9;

FIG. 11 is a view illustrating the operation of the rotary cam mechanism of the knocking writing instrument according to the embodiment and the engagement relationship between the locking surface of the clip ball and the locking portion of the rotor.

FIG. 12 is a longitudinal sectional view showing the whole ballpoint pen refill mounted on the knock-type writing instrument of the present invention.

FIG. 13 is an enlarged sectional view of a tip end portion of the tip.

FIG. 14 is a cross-sectional view of the channel portion of the chip slightly in front.

FIG. 15 is an enlarged cross-sectional view of a tip end portion according to another embodiment. (Shown with ink guide wick removed)

FIG. 16 is a cross-sectional view of a channel portion of a chip according to another embodiment, which is slightly forward.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refill of ball-point pen 2 Joint 3 Front shaft part 4 Inner hole part 5 Ink reservoir 6 Retaining groove 7 Flange part 8 Vent groove 9 Ink guide core 10 Ink guide core 11 Tip 11a Ball holding part 12 Shaft part 13 Tip ball 14 Ink storage tube 15 Closed portion 16 Ink 17 Channel portion 17a Ball receiving seat 17b Spring seat 17c Ink inflow groove 20 Rear shaft 20a Cam slope 20b Locking window 20c Cam side surface 20d Window 21 Clip cylinder 21a Clip 21b Locking surface 21c Tube portion 21d Groove 21e Locking piece 21f Locking projection 21g Side wall surface 21h Side wall surface 21i Rib 21j Projection 22 Rotor 22a Cam slope 22b Lock section 22c Cam slope 22d Projection 22e Cam side 23 Lead axis 24 Rubber grip 25 Knock rod 25a Cam slope 25b Rotation stop 25c Projection 6 the return spring 27 distal seal member 30 chips 30a ball holding portion 31 distal ball 32 channel members 32a ball seat 32b spring seat 32c ink inflow grooves

Claims (3)

[Claims] 1. An ink guide core is tightly packed in a chip inner hole,
A joint and an ink reservoir are integrally provided in series behind the chip, and the ink storage tube has a relatively large cross-sectional area. Refill of a ball-point pen, which is filled with ink and an ink reservoir is fitted into an inner hole in the front part of the ink storage tube, and a rotating cam which is locked at the back and forth position with respect to the shaft cylinder by a knocking operation behind the cylinder. In a knock-type writing instrument comprising a mechanism portion provided and a refill of the ballpoint pen urged rearward by a return spring in front of the rotary cam mechanism portion, a clip is provided on one side surface behind the barrel. A locking surface is formed on the ball portion at the tip thereof, and a window portion into which the ball portion is appropriately fitted is formed in the side surface of the shaft cylinder, while the rotary cam mechanism portion moves back and forth by knocking operation. Knock bar and Cam slopes are formed at two projecting portions in the axial direction that respectively meet the cam slopes provided on the hook rod and the cam slopes provided on the inner surface of the shaft cylinder,
Further, the rotor is provided with a protruding locking portion at the front thereof, and when the knock rod is advanced by the knocking operation, the rotor is rotated by the pressing action between the cam slopes, and the clip of the clip is rotated. The locking portion provided on the rotor is engaged or disengaged from the locking surface formed on the ball portion, and the writing tip of the refill of the ballpoint pen is locked so as to be able to protrude and retract from the tip opening of the barrel. A knock-type writing implement characterized in that when the ball portion of the clip is displaced in a direction away from the side surface of the barrel in the engaged state, the clip is disengaged and the writing tip can be immersed from the tip opening. . In a refill of a ballpoint pen, a tip ball is provided so as to be constantly pressed and intimately contacted with the inner edge of a ball holding portion at the tip of a tip, and to be released from a close contact state during writing. 2. The knock-type writing instrument according to claim 1, wherein the knock-type writing instrument can be mounted on a shaft cylinder without a seal. 3. A refill of a ball-point pen, wherein a tip of the tip ball contacts a back surface of the tip ball with a tip so that the tip ball comes into close contact with the inner edge of the ball holding portion when a writing pressure is applied. A spring seat for pressing the back surface is provided at a required location, and an ink inflow groove is formed between the ball seat and the spring seat where the ink can be supplied from the rear end of the chip to the tip ball. 3. The method according to claim 2, wherein
Knock-type writing utensil according to.