JP3444825B2 - Ballpoint pen - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a ball-point pen which allows replacement of refills. 2. Description of the Related Art The applicant of the present invention discloses, in Japanese Utility Model Publication No. 4-52067, a mechanism for preventing ink from flowing back in a ball-point pen provided with a valve chamber into which a ball is loosely fitted. In this device, a required number of protrusions are provided in a valve chamber in which a ball is loosely fitted with a synthetic resin mouth plug to prevent the ball from being pulled out, and a gap formed between the protrusions during writing. And the ink flows to the chip. Further, a ballpoint pen using an ink having a shear thinning viscosity, in which the viscosity is reduced by the rotation of the tip ball during writing and the ink flows out, is known. In general, a ballpoint pen using an ink having shear thinning viscosity has a large amount of outflow of ink (to increase the writing density), and has a large diameter of an ink containing tube to increase the amount of ink loaded. Further, since the viscosity of the ink is smaller than that of the ink of the oil-based ball-point pen, the flow resistance to the ink storage tube is small. Accordingly, ink leakage (ink flows backward at the rear end of the ink storage tube) easily occurs due to the ink's own weight or impact. For this reason, the ink usually moves following the consumption of ink at the time of writing at the rear end of the ink, but a grease-like follower that suppresses the backflow of the ink due to its own weight or impact, and a follower as necessary. A rod is loosely inserted in the follower. However, even when the follower is provided, if the ink immediately below the ball of the chip runs out when writing upward, there is a danger that the ink and the head will be added directly, causing a remarkable backflow and soiling the hands and clothes. Further, since the viscosity of the ink is low and the amount of outflow is large, there is a problem that the ink bleeds (DC) if a gap is formed between the tip ball and the chip holding portion when the tip side is directed downward. [0004] In addition, a refill of an aqueous ball-point pen using an ink occlusion body or an ink storage body and a rear shaft are joined to each other,
(The rear end of the refill is closed and has a vent hole in front of the mouth.) The tip of the tip and the mouth are inserted into the inner hole of the inner cap fixed to the inner hole of the cap, and the mouth of the mouth is closed. The outer periphery is closely attached to the insertion opening of the inner cap,
There is known an aqueous ballpoint pen in which a tip ball and a ventilation hole are closely fitted in an inner hole portion of an inner cap to prevent evaporation of ink and drying of a tip ball portion. SUMMARY OF THE INVENTION An object of the present invention is to use ink having a low viscosity or an ink having a shear-thinning viscosity in which the viscosity is reduced by rotation of a ball during writing and the ink flows out. A ballpoint pen and a refill of an aqueous ballpoint pen using an ink occluding body or an ink storing body are interchangeably loadable into a writing implement body composed of the same rear shaft and cap, and in a ballpoint pen having a shear thinning property, It is possible to prevent reverse flow of ink caused by upward writing or impact and direct current when the tip side is placed downward, thereby preventing contamination of the inside of the barrel of a ballpoint pen, hands, and clothes. [0006] In order to achieve the above object, a ballpoint pen according to the present invention has a tip of a ballpoint pen at a tip of a tip shaft portion.
Ball having an ink container tube integrally at the back
Connect the pen refill to the tip of the refill.
The tip of the tip that is fitted to the rear shaft and the front shaft
Secure the seal stopper into the inner hole of the inner cap.
In the ballpoint pen composed of the fixed cap and
The above-mentioned ink storage tube and tip shaft are integrated with a transparent resin molded product.
Low viscosity ink or static ink
Has high viscosity and viscous when the tip ball rotates during writing.
Has a so-called shear thinning viscosity, which causes ink to flow out
Ink is filled, and ink is exhausted on the trailing edge of the ink.
With a follower that contacts and follows the ink surface.
And the spring is inserted into the tip bore,
The tip of the spring is provided so that it cannot be pulled out from the tip of the tip.
After the tip ball rotatably held at the tip of the tip
Press the end so that the tip ball is inside the ball holding portion of the chip.
Being close to the edge, it is possible to prevent the outflow of ink,
At the required position at the rear end of the outer cylinder of the front shaft,
The groove is formed by joining the rear shaft to the joint
A ventilation path is formed between the inside of the rear shaft and the inside of the rear shaft.
And the front end of the groove at the front position of the front end of the rear shaft
Ventilation hole that communicates with the refill ink reservoir
The rear end communicates with the outside air. FIG. 1 and FIG. 2 show an embodiment of the present invention. First, as shown in FIG.
3, externally composed of the tip portion 30, the ink storage tube 43, and the tail plug 21. The front shaft portion 30 is integrally formed of a synthetic resin, and has a lip portion 31 at the front thereof and an outer cylinder portion 3 at the rear thereof.
3 are integrally formed. A hole penetrates the shaft center, and a tip of the tip portion 31 has a ball-point tip 2.
3 is crimped. A valve chamber 35 is provided in contact with the rear end of the shaft portion 26 behind the chip 23, and a tapered or spherical ball receiving seat 36 is formed at the rear end of the valve chamber 35. By the way, in the embodiment, the chip 23
A valve chamber 35 is provided eccentrically with respect to the axis of the shaft section 26, and a tapered or spherical ball receiving seat 36 is formed at the rear of the valve chamber 35 so as to communicate with the guide hole 39. or,
A groove 37 into which ink can flow is provided on one side of the inner wall of the valve chamber 35.
Are formed. Further, the ball valve 40 is loosely fitted in the valve chamber 35, and the ball valve 40 abuts against the rear end of the shaft 26 of the chip with the tip 23 facing downward, and the groove 37 Thus, the ink flowing from the guide hole 39 through the hole flows into the chip. The valve chamber is provided at the axis of the lip portion 31, the ball valve is loosely fitted in the valve chamber, and the ink is conducted inside the chip in a state where the chip is directed downward. The embodiment has been previously filed by the present applicant. On the other hand, the tip 23 is caulked so that the tip ball 24 is rotatably held with the tip ball 24 substantially in contact with a seat having a channel into which ink can flow. A spring 28 is inserted into the chip inner hole 25, the rear end of the shaft 26 of the chip is appropriately caulked, and the rear end of the spring 28 is provided so as not to be pulled out. An upright bar shaft 29 is formed in front of the spring 28, and the tip of the bar shaft 29 presses against the rear end of the tip ball 24 in a pressing manner. The tip ball 24 is brought into close contact with the inner edge of the ball holding portion (formed by caulking or the like) of the chip 23 by the pressing. As described above, when the tip side is downward, the ball valve 40 comes into contact with a state in which the ball valve 40 is biased to the rear end of the caulking portion 27, and ink flows into the tip inner hole 25 through the guide hole 39, the valve chamber 35, the groove 37, and the like. It flows in and conducts to the rear end of the tip ball 24. The front shaft portion 30 has an inner cylindrical portion 32 extending rearward of the guide hole 39, and has an outer periphery ahead of the inner cylindrical portion 32, a lip portion 31, and a front end of the outer cylindrical portion 33. A required number of ribs 34 are formed around the circumference. In addition, a cylindrical ink storage tube 43 is pressed against the outer periphery behind the inner cylindrical portion 32 by abutting its front end on the rear end of the rib 34, and the inner diameter portion of the ink storage tube 43 communicates with the guide hole 39. . The ink 44 has a low viscosity ink or a low viscosity ink which has a high viscosity statically, and has a viscosity reduced by the rotation of the ball during writing, and has a shear thinning viscosity which allows the ink to flow out. Is filled and ink 4
4 is filled with a grease-like follower 45 which is movable in contact with and following the ink surface as the ink is consumed. A follower rod 46 made of resin is loosely inserted into the follower 45. The follower rod 46 is provided as necessary (the ink container tube is thick, the ink head is large, and the viscosity of the ink is low and the ink head cannot be supported). A tail plug 21 having a vent hole 22 communicating with the outside air is pressure-bonded to the rear end of the ink storage tube 43. The refill 20 of the ball-point pen is configured as described above, and as shown in FIG. 1, the front shaft portion 30 and the rear shaft 16 are screw-connected to form a shaft cylinder. Further, the front shaft portion 30 has a screw portion 41 at a rear end, and a groove portion 42 is provided at a required portion of the screw portion 41.
Are formed, and a ventilation path 14 and a ventilation hole 15 are formed, which are connected to the outside air when joined to the rear shaft 11 described later. The rear shaft 11 has a screw tube 12 crimped in a front end inner hole, and a tail plug 16 is fixed to a rear end of the rear shaft 11 with a fixing member 17 located in the inner hole of the rear shaft 11. A spring 18 is provided upright at the axis of the tool 17. The rear shaft 11 of the refill 20 is screwed to the screw portion 41 of the front shaft portion 30. At this time, the rear end of the tail plug 21 of the refill contacts the front end of the spring 18, and the refill 30 is urged forward in a pressing manner. Note that the spring 18 acts as a mutual stop at the screw joint between the front shaft portion 30 and the rear shaft 11, but is not necessary for the purpose of the present application. The crown 3 is crimped to the rear end hole of the cap 1 by holding the clip 2 between the fixture 4 and the crown 3.
Further, an inner cap 5 having a closed rear end is inserted into the inner hole of the cap 1, and the rear end of the inner cap 5 is crimped to the fixture 4. Front inner hole 7 of inner cap 5
A seal stopper 6 made of a non-liquid-absorbing elastic body (for example, made of rubber) is fixed to the rear end. Further, an insertion hole 8 for the inner hole portion is formed in front of the inner hole portion 7, and an outer cylinder portion 9 is formed outside the insertion hole 8. An inward projection is formed on the inner peripheral surface of the outer cylinder portion 9 near the front end thereof. Is formed. As described above, the tip shaft portion of the refill 20 is fitted into the cap 1, the tip ball 24 is pressed into the seal plug 6 in a biting manner, and the outer peripheral portion of the mouth portion 31 is attached to the inner cylinder. The cap 1 is fixed by closely contacting the insertion opening 8 of the portion, and the engaging portion 10 of the outer cylindrical portion is elastically engaged with the engaging groove 38 of the tip portion. In addition, the tip ball portion is the inner hole 7
However, since the spring 28 presses the rear end of the tip ball 24 before the tip ball 24 comes into contact with the seal plug 6, air is drawn into the chip inner hole 25 by pressurization. It is not. Also, the front shaft portion 30 and the rear shaft 11
Air flows between the outside air and the rear end of the follower 45 through the ventilation hole 22 of the tail plug 21 of the refill 20 through the ventilation path 14 and the ventilation hole 15 formed at the screw joint portion between the outside and the rear. By the way, the ventilation hole 15 can be provided by drilling a ventilation hole in the outer cylindrical portion 33 of the front shaft portion or the side surface of the rear shaft 16 separately from the embodiment. Further, in the embodiment, the tip shaft portion 30 and the ink containing tube 43 are provided separately in the refill 20, but they may be formed integrally for the sake of design. In addition, if the ink containing tube 43 is formed of a transparent resin molded product and the tip shaft portion 30 is formed of a transparent resin molded product, the remaining amount of ink can be seen through. Also, the outer cylindrical portion 3 of the tip shaft portion
An opaque print or the like may be applied to the peripheral surface of No. 3 so that only necessary portions can be seen through. Further, it is also possible to make the front shaft portion opaque so that a window portion is formed on the peripheral surface of the outer cylinder portion so that the front portion can be seen through. First, the refill 20 shown in FIG. 2 shows a state in which the tip 23 is directed upward. At this time, the ball valve 40 comes into close contact with the ball receiving seat 36 of the valve chamber 35 and the guide hole 3 is formed.
Since the ink 9 is sealed, the ink does not flow backward even if the ink immediately below the tip ball 24 is exhausted by upward writing. Therefore, when the tip 23 is turned downward, the ink can immediately flow out, and the writing is prevented from being blurred. (By the way, in the structure without the ball valve, the ink head acts in the backward flow direction in upward writing, so that air is entrapped in the chip, and ink does not immediately follow in downward writing, causing blurring. In addition, repetition of upward writing In the state before writing with the chip 23 facing down, the ball valve 40 is in contact with the rear end of the shaft 26 of the chip, and the guide hole 39 is opened. The ink 44 that has entered the valve chamber 35 from the ink storage pipe 43 through the guide hole 39 is supplied to the groove 37.
And flows into the chip inner hole 25 to be conducted to the rear end of the tip ball 24. In this state, the tip ball 24 comes into close contact with the inner edge of the chip holding portion by the pressing of the rod shaft portion 29 of the spring 28, so that the direct current of the ink 44 is prevented.
Further, since the tip ball 24 slightly retreats due to the writing pressure, a gap is generated and the ink can flow out, and the writing can be performed by rotating the tip ball 24 so that the ink flows out. A channel (a seat for a tip ball having a plurality of ink inflow grooves penetrating toward the inner hole of the chip) is provided immediately below the tip ball 24. A rod shaft of a spring 28 is provided in a center hole of the channel. The part 29 penetrates. The ink in the chip is filled with the ink inflow groove and the center hole and the rod shaft 2.
9 is guided directly below the distal end ball 24. The configuration and operation of the ballpoint pen according to the present invention are as described above. The ballpoint pen refill and the ink occluding material or the ink storing material using low viscosity ink or ink having shear thinning property are used. The refill of the used water-based ball-point pen can be loaded into the common writing instrument body. or,
Since the tip ball is in close contact with the inner edge of the tip holding portion except when writing, direct current is prevented when the ink flows backward or is placed downward, thereby preventing accidents that stain the inside of the barrel, hands, and clothes.
In addition, handwriting due to drying is prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a ballpoint pen according to an embodiment of the present invention, which is partially non-sectional. FIG. 2 is a longitudinal sectional view of a ballpoint pen refill used in the present invention, showing a state in which a chip is directed upward. [Description of Signs] 1 Cap 2 Clip 3 Crown 4 Fixture 5 Inner cap 6 Seal plug 7 Inner hole 8 Inner hole insertion port 9 Outer cylinder 10 Locking section 11 Rear shaft 12 Screw tube 13 Screw section 14 Vent path 15 Vent hole 16 Tail plug 17 Fixture 18 Spring 20 Refill 21 Tail plug 22 Vent hole 23 Tip 24 Tip ball 25 Tip bore 26 Shaft portion 27 Caulking portion 28 Spring 29 Bar shaft portion 30 Front shaft portion 31 Tip end 32 Inner tube part 33 Outer tube part 34 Rib 35 Valve chamber 36 Ball receiving seat 37 Groove part 38 Lock groove 39 Guide hole 40 Ball valve 41 Screw part 42 Groove part 43 Ink storage tube 44 Ink 45 Follower 46 Follower rod

Claims (1)

(57) [Claims] [Claim 1] A tip of a ballpoint pen is attached to the tip of the front shaft portion.
Ballpoint pen with an ink storage tube
Feel and rear shaft joined to the front shaft of the refill
And the tip of the tip is pressed into the tip and pressed into the tip
Key that secures the sealing plug to the inner hole of the inner cap.
In a ball-point pen comprising a cap, the ink storage tube and the tip shaft are formed as an integral transparent resin molded product.
Low viscosity ink or static ink
Has high viscosity and viscous when the tip ball rotates during writing.
Has a so-called shear thinning viscosity, which causes ink to flow out
Ink is filled, and ink is exhausted on the trailing edge of the ink.
With a follower that contacts and follows the ink surface.
And the spring is inserted into the tip bore,
The tip of the spring is provided so that it cannot be pulled out from the tip of the tip.
After the tip ball rotatably held at the tip of the tip
Press the end so that the tip ball is inside the ball holding portion of the chip.
The ink can be prevented from flowing out by being in close contact with the edge, and a contact having a groove at a required position at the rear end of the outer cylinder portion of the front shaft portion.
A joint is provided, and the rear shaft is joined to the joint.
Between the groove and the inner surface of the rear shaft to communicate with the inside of the rear shaft.
A channel is formed and the front end of the groove at the front position of the front end of the rear shaft
Section is a ventilation hole that communicates with the outside air,
That the rear end of the storage tube is connected to the outside air
A ballpoint pen characterized by the following.