JPH0545516Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a ballpoint pen which is a retractable type in which a ballpoint writing body protrudes and retracts from the tip of a barrel, and which uses oil-based ink.

[Prior art and its problems]

In a retractable ballpoint pen, the rear end of the ink cylinder of the refill of the ballpoint pen is inserted into the rod-shaped actuator, and when the actuator moves back and forth by the retracting mechanism built inside the barrel, the ball writing body is pushed out from the tip of the barrel. It's starting to appear. Then, the rear end of the ink cylinder must be inserted into the actuator with a predetermined fitting resistance so that the ballpoint pen refill does not fall out unexpectedly when being carried around and can be easily removed when replacing the ink cylinder. By the way, the ink cylinders of ballpoint pen refills are made of plastic pipes or metal pipes, and the inner diameter of the ink cylinders of ballpoint pen refills is not standardized, as those made of metal pipes are slightly larger. For this reason, in conventional retractable ballpoint pens, ink cylinders made of plastic pipes and those made of metal pipes are not compatible, and the two cannot be used in common.

[Purpose of invention]

Therefore, with this invention, the ink cylinder of a ballpoint pen refill can be used both with a plastic pipe and a metal pipe, and the rear end of the ink cylinder can be inserted into the actuator with a predetermined mating resistance. The object of the present invention is to provide a retractable ballpoint pen.

[Structure of the idea and its effects]

The structure of the present invention is that the rear end of the ink cylinder of the ballpoint pen refill is inserted into a rod-shaped actuator, and as this actuator moves back and forth, the ball writing body protrudes and retracts from the tip of the barrel. At the tip of the child, there are a plurality of first protrusions that can fit into the inner circumferential surface of the ink tube made of a plastic pipe of a ballpoint pen refill, and behind the first protrusions, there is a plurality of first protrusions that can fit into the inner circumferential surface of the ink tube made of a large diameter metal pipe. It is characterized in that a plurality of flexible second protrusions are formed that can fit into the surface.

That is, the height of the first protrusion (the diameter of the virtual circle connecting the tips of the plurality of first protrusions) is set to be slightly larger than the inner diameter of the ink cylinder made of plastic pipe, and smaller than the inner diameter of the ink cylinder made of metal pipe. If you keep it,
A metal pipe can be fitted into the second protrusion behind the first protrusion. Although the metal pipe itself has almost no flexibility, since the second protrusion has flexibility, it can be inserted with a predetermined fitting resistance. On the other hand, the one made of plastic pipe fits into the first protrusion, but since the plastic pipe is flexible, it expands and deforms when fitted, and can also be inserted with a predetermined fitting resistance. Therefore, the ink barrel of the ballpoint pen refill can be used in both plastic and metal pipes, and by utilizing the flexibility of the plastic pipe itself or the second protrusion, the rear end of the ink barrel can be can be inserted into the actuator with a predetermined mating resistance.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 6 shows a writing instrument that can be used for both a sharp pencil and a ballpoint pen, and an example in which the present invention is applied to this writing instrument will be described. In FIG. 6, a sharp pencil refill 2 and a ballpoint pen fill 3 are housed in the front barrel 1, and respective writing bodies 21 and 31 selectively protrude from the tip opening 11 of the front barrel 1. I'm starting to do that. A cylinder 4 is screwed onto the rear end of the front shaft cylinder 1. This cylinder 4, as shown in FIGS. 7 and 8,
Although it has two holes 41 inside, a cut groove 42 is formed in the axial direction, and the hole 41 communicates with the outside through the cut groove 42. A connecting portion 43 with a notch is formed at the rear end of the cylinder 4. A sharp pencil actuator 5 and a ballpoint pen actuator 6 are accommodated in the hole 41 of the cylinder 4, respectively, and cam followers 51, 61 are protruded from the actuators 5, 6. It protrudes outward from the cut groove 42. The rear ends of the sharp pencil refill 2 and the ballpoint refill 3 are connected to actuators 5 and 6, respectively. The rear end of the tube 32 is inserted into the ballpoint pen actuator 6. Further, both actuators 5 and 6 have actuating springs 7 and 7, respectively.
was shot backwards by

An annular inner protrusion 81 is formed in the rear shaft cylinder 8, and the inner protrusion 81 is rotatably fitted into the connecting portion 43 of the cylinder 4. Since the thickness of the inner protrusion 81 is smaller than the length of the connecting portion 43, it is possible to move back and forth by the difference. Note that between the rear barrel 8 and the front barrel 1,
Bellows-shaped cylinder cover 10 made of synthetic resin
is installed. Inside the rear shaft cylinder 8, there is a ninth
As shown in the figure, a cam surface 9 is formed, and this cam surface 9 forms the cam follower 5 of the actuator 5, 6.
It collides with 1,61. Therefore, when the rear barrel 8 is rotated forward or backward relative to the front barrel 1, either of the actuators 5, 6 moves forward, and the tip 91 of the cam surface 9 engages with the actuator 5 or 6. When combined, the writing body 21 or the writing body 31 protrudes from the tip opening 11 of the front barrel 1, as described above.

Here, the ballpoint pen actuator 6 is a rod-shaped body injection-molded from synthetic resin, and as shown in FIG. 1, a small diameter portion 62 is formed at the tip thereof, and a medium diameter portion 63 is formed. The outer diameter of the small diameter portion 62 is approximately equal to the inner diameter of the ink cylinder 32a made of a plastic pipe, and the outer diameter of the medium diameter portion 63 is approximately equal to the inner diameter of the ink cylinder 32b made of a metal pipe. Although a pair of first protrusions 64 are formed in the small diameter portion 62, the virtual circle connecting the tips of both first protrusions 64 is slightly smaller than the medium diameter portion 63. That is, when inserting the metal pipe ink cylinder 32b, it passes through the first protrusion 64 and is fitted into the medium diameter portion 63. Further, the medium diameter portion 63 is cut out in the shape of a slit and penetrates through it, and a pair of semicircular second protrusions 65 are formed with the flesh portion bulging outward. Therefore, the second protrusion 65
has flexibility and deforms elastically when the surface of the second protrusion 65 is pressed.

When the rear end of the ink cylinder 32b made of a metal pipe with a large inner diameter is inserted into the actuator 6, as shown in FIG. Mates with mating resistance.
Furthermore, when the rear end of the ink cylinder 32a made of a plastic pipe with a small inner diameter is inserted into the actuator 6, the ink cylinder 32a is elastically deformed as shown in FIG. and are mated with a predetermined mating resistance.

In this way, as the ink cylinder 32, it is possible to use the ballpoint pen refill 3 to which either the metal pipe ink cylinder 32b or the plastic pipe ink cylinder 32a is attached, and the plastic pipe ink cylinder 32a itself or the second ink cylinder 32a can be used. Since the flexibility of the protrusion 65 is utilized, both can be fitted with a predetermined fitting resistance.

[Effect of idea]

As explained above, in the retractable ballpoint pen of the present invention, the rod-shaped actuator is provided with a first protrusion into which an ink cylinder made of a plastic pipe is fitted, and a second protrusion into which an ink cylinder made from a metal pipe is fitted. Since the second protrusion is made flexible, the ink barrel of the ballpoint pen refill can be used both with plastic pipes and metal pipes, and in both cases, the rear end of the ink barrel can be kept in a specified position. It can be inserted into the actuator with a mating resistance of .

[Brief explanation of the drawing]

FIG. 1 is a front view of the ballpoint pen actuator, FIGS. 2 and 3 are sectional views taken along lines - and -, respectively, in FIG. FIG. 6 is an explanatory diagram of the dual-use writing instrument, FIG. 7 is a front view of the cylinder, FIG. 8 is a sectional view taken along the - line in FIG. 7, and FIG. 9 is a sectional view of the rear barrel. 1... Front barrel, 2... Sharp pencil refill, 3... Ballpoint pen refill, 31... Ball cursive, 32... Ink cylinder, 32b... Ink cylinder made of metal pipe, 32a... Made of plastic pipe. Ink cylinder, 4... Cylinder, 6... Ballpoint pen actuator, 64... First projection, 65... Second projection, 7... Operating spring, 8... Rear barrel, 9...
...cam face.

Claims (1)

[Scope of Claim for Utility Model Registration] A retractable ballpoint pen in which the rear end of the ink cylinder of a ballpoint pen refill is inserted into a rod-shaped actuator, and as the actuator moves back and forth, the ball writing body protrudes and retracts from the tip of the barrel, At the tip of the actuator, there are a plurality of first protrusions that can fit into the inner peripheral surface of the plastic pipe ink cylinder of the ballpoint pen refill, and behind the first protrusions,
A retractable ballpoint pen characterized in that a plurality of flexible second protrusions are formed that can fit into the inner peripheral surface of an ink barrel made of a large diameter metal pipe.