JPH09563U - Ballpoint pen - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to know the consumption of ink, to easily display the color of ink, and to prevent the rattling of the tip from the tip portion with an inexpensive barrel structure. [Structure] A ball-point pen refill equipped with an ink backflow prevention mechanism in which a tip of a ballpoint pen is crimped to the tip of the joint, an ink storage tube is fixed to the rear end, and a ball valve is loosely fitted in the inner hole of the joint. In a ball-point pen that is mounted inside and positioned so that the tip of the tip projects, the shaft cylinder is made of transparent resin, and a step is provided in the inner hole of the mouth part integrally provided at the tip of the shaft cylinder. , A tail plug is detachably attached to the rear end of the shaft cylinder while the rear end of the ball-point pen refill mounted in the shaft cylinder is being pressed, and the outer periphery of the joint is attached to the step portion provided in the inner hole of the mouth portion. The parts are engaged with each other in a biting manner so that the tip is rattled against the tip of the mouth.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in the shaft structure of a ballpoint pen.

[0002]

[Prior art]

 Conventionally, an ink backflow prevention mechanism for a ballpoint pen is disclosed in Japanese Utility Model Publication No. 4-52067. Further, a ballpoint pen refill is usually constructed by fixing a tip of a ballpoint pen to the tip of a tube-shaped ink containing tube, and providing a rib having a stepped portion at a plurality of points in an inner hole of a tip end of a shaft cylinder, It is known that the tip of the ink containing tube comes into contact with the step portion when the tip is in a protruding state by mounting a ball-point pen refill on the shaft cylinder to prevent backlash of the chip. It is well known that the barrel is made of transparent resin.

[0003]

[Problems to be solved by the device]

 The present invention is directed to a widely-used desk-top ballpoint pen. This type of ball-point pen is consumed in large quantities for office work, and there are high demands for economy and quality. As a request, 1. Know ink consumption. 2. The color display of the ink is easy to understand. 3. Do not let ink flow backwards until it is used up, and it will not become dirty or unreadable. 4. The tip should not rattle when writing. And so on. The present invention is particularly applicable to the above 1. And 2. And 4. Is an improvement.

[0004]

[Means for Solving the Problems]

 The ballpoint pen of the present invention devised to achieve the above object is such that the tip of the ball pen is crimped to the tip of the joint, the ink containing tube is fixed to the rear end, and the ball valve is attached to the inner hole of the joint. In a ballpoint pen in which a ballpoint pen refill equipped with an ink backflow prevention mechanism that loosely fits is installed in the barrel so that the tip of the tip projects, the barrel is made of transparent resin and its tip A step is provided in the inner hole of the mouth part that is integrally provided on one side, and the tail plug is detachably attached to the rear end of the barrel while the rear end of the ballpoint pen refill mounted in the barrel is pressed. The tip outer peripheral portion of the joint is engaged with the stepped portion provided in the inner hole of the mouth portion in a biting manner, and the tip is rattled against the mouth portion. .

[0005]

【Example】

 1 to 3 show an embodiment of the present invention. First, as shown in the figure, the shaft cylinder 1 is a transparent resin molded product, and has a mouth part 3 integrally at its tip, an engaging part consisting of a protrusion and a groove part on the outer periphery thereof, and a step part in the inner hole. 3'is formed. Further, a step portion is formed at the rear end of the engaging portion, with which the end portion of the cap 24 described later comes into contact. Further, a tail plug 21 is detachably fixed to the rear of the barrel 1, and the tail plug 21 has an engaging portion formed of a protrusion and a groove portion on the outer periphery of the tail plug 21 as described above, and a cap 24 at the front end of the engaging portion. Is formed with a step portion with which the end portion of the contact portion abuts.

In addition, the joint 4 is provided with a front shaft portion 5 in which an inclined rib 12 is formed at a required position in a front half thereof, and a ring-shaped collar portion 6 is formed at a rear end of the rib to form the rib 12. The rear end of the collar 6 is connected to the outer diameter of the collar 6 to be substantially the same. Further, the rear shaft portion 7 is provided in the latter half, and the ink containing tube 18 is fixed to the rear shaft portion 7. The tip 14 holding the tip ball 15 is press-fitted into the tip hole of the front shaft portion 5 from the rear end side.

The joint 4 is integrally formed of a synthetic resin that is the same color as the ink color and is elastically deformable, and a valve chamber 8 is provided at the rear of the joint 4 so as to communicate with the tip hole of the front shaft portion 5. A conical ball receiving seat 10 is provided at the rear of the valve chamber 8. Further, the valve chamber 8 fits inside the inner periphery of the tip hole, and the axis of the hole of the valve chamber 8 is appropriately eccentric with respect to the tip hole, that is, the axis of the press-fitting shaft portion of the tip, and at the same time, one side of the valve chamber hole. A groove portion 9 is provided in the valve chamber, and a ball valve 13 is loosely fitted in the valve chamber. Further, a guide hole 11 that communicates with the ball receiving seat 10 is formed behind the valve chamber 8.

A cylindrical ink storage tube 18 is press-fitted and fixed to the outer periphery of the rear shaft portion 7 by abutting the tip thereof to the rear end of the collar portion 6, and the inner diameter portion of the ink storage tube 18 is guided to the joint 4. It communicates with the hole 11. The ink containing tube 18 is filled with the ink 19 having a statically high viscosity and a shear thinning property that reduces the viscosity by the rotation of the tip ball during writing and allows the ink to flow out. Further, the rear end of the ink 19 is filled with a transparent or semi-transparent grease-like follower 20 which prevents the evaporation of the ink and is movable in contact with the ink surface as the ink is consumed. A pipe material 20 'having a specific gravity substantially equal to that of the follower 20 is immersed in the follower 20. A tail plug 21 is detachably attached to the rear end of the barrel 1 by means such as screwing.

Next, the ballpoint pen refill 2 to which the tip 14, the ink 19, and the ink containing tube 18 filled with the follower 20 are fixed is inserted into the joint 4 from the tip of the barrel 1 and the tip portion 3 of the barrel 3 is inserted. The rear end of the ink containing tube 18 is fitted into the inner hole of the tail plug 21 with the outer periphery of the inclined rib 12 provided at a required position of the front shaft portion 5 of the joint on the stepped portion 3'butting against each other in a biting manner. The tail plug 21 is fixed to the rear end of the barrel 1 so as to come into contact with the stepped portion 23 of the rib 22 provided at the required position.

By the way, the cap 24 fitted on the shaft tip is a transparent resin molded product having excellent elasticity, and a clip is positioned on the outer peripheral side surface of the cap 24 to crimp the rear end cylindrical portion to the rear end hole. Further, a ventilation hole penetrates through the rear end of the tubular portion. A cylindrical inner cap 25 having a small chamber is provided behind the inner hole of the cap 24, and the inner cap 25 is integrally formed with a required number of ribs between the inner cap 25 and the inner hole portion. As described above, a ventilation path communicating with the ventilation hole from the cap insertion port is formed between the ribs. Further, the cap 24 is formed with two engaging portions of the ridges at two separate and independent positions in the inner hole portion on the insertion side. Further, a seal stopper 26 made of a non-absorbent and non-continuous bubble elastic body is fixed to the tip of the small chamber of the inner cap 25, and the tip of the tip 14 and the tip 3 are fitted closely in the small chamber. The tip ball 15 is appropriately pressed against the seal plug 26.

[0011]

[Action]

 With the above configuration, backflow of ink is prevented against upward writing and impact. Further, since the rib 12 of the joint is engaged with the step portion 3 "of the tip portion 3 in a biting manner, the rattling of the tip 14 is prevented. Further, since the mouth portion 3 is transparent, the joint 4 can be seen through.

[0012]

[Effect of the invention]

 The structure and operation of the ball-point pen of the present invention are as described above, and it is possible to provide the ballpoint pen at a low cost because the tip portion is integrally provided on the barrel, and the tip has no rattling with respect to the tip portion. In addition, by making the ink color of the joint the same as that of the ink, the type of ink becomes clear. Further, since the backflow of ink can be prevented, the inability to write and the stain are prevented.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a front half of a ball-point pen that is an embodiment of the present invention, showing a state in which a cap is fitted to the tip of a barrel.

FIG. 2 is an enlarged cross-sectional view of a rear half portion of a ball-point pen that is an embodiment of the present invention.

FIG. 3 is a half cross-sectional view of a ball-point pen that is an embodiment of the present invention, showing a state in which a cap is fitted behind a barrel.

[Explanation of symbols]

 1 Shaft cylinder 2 Ballpoint pen refill 3 Tip part 3 `Step part 4 Joint 5 Front shaft part 6 Collar part 7 Rear shaft part 8 Valve chamber 9 Groove part 10 Ball receiving seat 11 Guide hole 12 Rib 13 Ball valve 14 Tip 15 Tip press ball 16 Press fit Shaft part 17 Rear end part 18 Ink storage tube 19 Ink 20 Follower 20 'Pipe material 21 Tail plug 22 Rib 23 Step part 24 Cap 25 Inner cap 26 Seal plug body

Claims (1)

[Utility model registration claims] 1. A ball-point pen refill equipped with an ink backflow prevention mechanism in which a tip of a ballpoint pen is pressure-bonded to the tip of a joint, an ink containing tube is fixedly attached to the rear end, and a ball valve is loosely fitted in an inner hole of the joint. In a ball-point pen that is mounted in a barrel and positioned so that the tip of the barrel protrudes, the barrel is made of transparent resin, and a step is formed in the inner hole of the tip integrally formed at the tip of the barrel. A tail plug is detachably attached to the rear end of the shaft cylinder while the rear end of the ball-point pen refill mounted in the shaft cylinder is being pressed, and the joint is attached to the stepped part provided in the inner hole of the mouth part. A ball-point pen, characterized in that the tip outer periphery is engaged in a biting manner so that the tip is rattled against the tip of the mouth.