JP3290587B2 - Knock-type water-based ballpoint pen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock-type water-based ball-point pen in which a ball-point pen refill containing water-based ink is accommodated in a barrel.

[0002]

2. Description of the Related Art In a knock-type oil-based ball-point pen, a writing portion at the tip of a ball-point pen refill is made to protrude and retract from a tip end opening of a barrel by repeating a knocking operation of pressing a knock member protruding from a tail end of a barrel. There are many double knocking types, but this double knocking type has an advantage that the inward / outward operation is extremely easy.

[0003] As a double knock mechanism, a "rotary knock type", a "heart type" and the like are widely put into practical use. In the rotary knock type, the engaging portion of the rotor is inserted into the vertical groove between the vertical ribs formed in the shaft cylinder, and when the knock operation is performed, the knock member moves forward with the rotary force applied to the rotor. When the engaging portion of the rotor comes out of the longitudinal groove of the barrel, the rotor rotates a predetermined angle and engages with the end of the longitudinal rib, whereby the writing portion at the tip of the ballpoint pen refill projects from the leading end opening of the barrel. ,
Receive pen pressure. And when you perform the knocking operation again,
The rotor to which the rotational force is applied rotates by a predetermined angle, the locking portion of the rotor is fitted again between the vertical grooves and retreats, and the writing portion at the tip of the ballpoint pen refill is immersed in the shaft cylinder.

In the heart type, a cam follower is fitted in a substantially heart-shaped cam groove, and when a knock operation is performed, the cam follower advances along the substantially heart-shaped cam groove to lower the lower end of the gum groove. The writing portion at the tip of the ballpoint pen refill projects from the tip opening of the barrel to receive writing pressure. Then, when the knocking operation is performed again, the cam follower retreats along the cam groove, and the writing portion at the tip of the ballpoint pen refill enters the shaft cylinder.

By the way, a knock-type water-based ballpoint pen is
If the writing part at the tip of the ballpoint pen refill projects from the opening of the tip of the barrel when stored in the pocket, when the writing part adheres to the cloth, the water-based ink with low viscosity is widely spread on the cloth due to the capillary action of the cloth. It penetrates and stains clothes. For this reason, a safety clip which cannot be attached to a pocket when the writing portion at the tip of the ballpoint pen protrudes from the opening at the tip of the barrel is often used.

[0006]

Various types of safety clips have been proposed and put into practical use. For example, when a knocking operation is performed, the safety clip is integrated with a knock member protruding from the tail end opening of the barrel. When the clip is moved forward, the writing portion at the tip of the ballpoint pen refill projects from the tip opening of the barrel, and at this time, the engaging projection at the tip of the clip for pressing against the cloth is formed in the barrel. To receive the pen pressure. Therefore, in this state, it cannot be attached to the pocket.
The engagement between the engaging projection at the tip of the clip and the hole of the barrel is released by the cloth inserted between the barrel and the clip, and the writing portion at the tip of the ballpoint pen refill is immersed in the barrel.

As described above, in the safety clip, since the engaging projection at the tip of the clip is used as a member for receiving the writing pressure, when the writing portion at the tip of the ball-point pen refill enters the shaft cylinder, the clip is It is necessary to release the engagement between the engaging projection at the tip of the clip and the hole of the shaft cylinder by rotating by pressing or lifting a part of the clip. In other words, there is a problem that the operation when the writing portion at the tip of the ballpoint pen refill is protruded and the operation when it is immersed are different, and the operation is complicated.

Accordingly, an object of the present invention is to provide a knock-type aqueous ball-point pen in which the writing portion at the tip of the ball-point pen refill can be projected and immersed by the same knocking operation.

[0009]

According to the present invention, a ball-point pen refill containing water-based ink is housed in a shaft barrel having a tapered front end at a tip thereof. By repeating the knocking operation of pressing the knocking member protruding from the end, the writing portion at the tip of the ballpoint pen refill is a knock-type aqueous ballpoint pen that protrudes and retracts from the tip opening of the barrel, and a long hole is drilled at the front end, and the clip is When the fixing portion at the base end engages with the edge of the long hole and the clip is disposed so as to be able to move forward and backward, and when the ballpoint pen refill advances and the writing part at the tip of the ballpoint pen refill projects from the front end opening of the barrel, The clip, which has been advanced along the tapered front end, is brought into close contact with the surface of the barrel, and the locking projection of the clip is inserted into a hole formed in the barrel.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. In FIG.
Is composed of a front shaft 11 and a rear shaft 12 injection-molded with a synthetic resin. The front shaft 11 has a front end opening 14, and the rear shaft 12 has a tail end opening 17. The front end of the front shaft 11 is a tapered front opening 13, and the front opening 13 is provided with a longitudinally elongated hole 15. The front shaft 11 has a hole 16 through which the locking projection 31 of the clip 3 is inserted.

A ball-point pen refill 2 containing a water-based ink is accommodated in the barrel 1 in a state where the ball-point refill 2 is repelled toward the tail end by a spring 22. Ballpoint pen feel 2
Is a writing section 2 holding the ball freely at its tip
One. The tail end of the ballpoint pen refill 2 is provided with a rotor 5 which is a component of a rotary knock type retracting mechanism.
Is in contact with

The retracting mechanism in the present embodiment is a well-known rotary knocking retracting mechanism. The retracting mechanism moves between a knock member 4, a rotor 5, and a vertical rib formed on the inner peripheral surface of the shaft cylinder 1. Of vertical grooves 6. That is, the knock member 4
A knock cover 41 is fitted to the tail end of the, and protrudes from the tail end opening 17, and is repelled toward the tail end by a knock spring 42. The tip of the knock member 4 is in contact with the rotor 5, but the contact portion is inclined, and when the knock member 4 pushes the rotor 5 to move forward, the rotor 5
Is given a rotational force. The rotor 5 has a rib-shaped engaging portion 51 on the outer periphery, and the engaging portion 51 is fitted in the vertical groove 6.

Therefore, when the knocking operation is performed by pressing the knock cover 41, the rotor 5 moves forward in a state in which the rotational force is applied, and the writing portion 21 projects from the distal end opening 14. At this time, the rotor 5 5, the engagement portion 51 comes out of the vertical groove 6,
The rotator 5 rotates a predetermined angle, for example, 60 °, and engages with the tip of a vertical rib constituting the vertical groove 6 to receive writing pressure. When the knock operation is released, the knock spring 42 is released.
As a result, the knock cover 41 repelled toward the tail end returns to the original position. When the knocking operation is performed again from this state, the rotor 5 engaged with the tip of the vertical rib constituting the vertical groove 6 slightly advances to release this engagement, and rotates 60 ° to rotate the rotor 5. When the engaging portion 51 is fitted into the vertical groove 6 again and retreated, the writing portion 12 is immersed in the barrel 1. In the above embodiment, the retractable mechanism is of the rotary knock type, but may be of the heart type. Anything that repeats protrusion and immersion from the device may be used.

The clip 3 is attached to the front shaft 11 so as to be movable back and forth. That is, the writing unit 21 is mounted in a direction opposite to that of a normal writing instrument, and the writing unit 21 faces upward when attached to a pocket. This is because, in the case of a water-based ballpoint pen, if the writing unit 21 is attached to a pocket with the writing unit 21 facing downward, there is a risk of ink dripping from the writing unit 21 and soiling the clothes.

A fixed portion 32 is attached to the base end 3 a of the clip 3, and the fixed portion 32 is inserted into the front shaft 11. And the fixing part 32 is a ballpoint pen refill 2
The clip 3 also moves back and forth when the ballpoint pen refill 2 moves back and forth. Further, as shown in FIGS. 3 and 4, the locking recess 32 a of the fixing portion 32 is engaged with the edge 15 a of the long hole 15. Accordingly, the clip 3 moves back and forth along the tapered front opening 13 at the base end 3a. That is, as the clip 3 moves forward, the gap with the barrel 1 becomes smaller and sinks, and conversely, as the clip 3 retreats, the barrel 1
The gap between them is large and they are raised.

When the knocking operation is performed by pressing the knock cover 41 with the fingertip from the state shown in FIG. 1, the ballpoint pen refill 2 advances and the writing portion 21 protrudes from the distal end opening 14 as described above, and writing is possible. However, as the ballpoint pen refill 2 advances, the clip 3 also advances, and as shown in FIG. 2, the clip 3 comes into close contact with the shaft cylinder 1, and the locking projection 31 engages with the hole 16 formed in the shaft cylinder 1. Immerse yourself. That is, in a state where the writing portion 21 protrudes from the distal end opening 14 and is writable, the clip 3 loses its original function and cannot be attached to the pocket, and functions as a safety clip.

Next, when the knocking cover 41 is pressed again with a fingertip to perform a knocking operation from the state shown in FIG. 2, the ballpoint pen refill 2 retreats and the writing unit 21 enters the shaft cylinder 1 as described above. However, since the clip 3 repelled by the spring 22 also retreats and returns to the state shown in FIG. 1, the clip 3 can be attached to the pocket.

[0018]

As described above, the knock-type water-based ballpoint pen of the present invention has a safety clip, and is attached to the pocket when the writing portion of the ballpoint pen refill projects from the tip opening of the barrel and is writable. It does not damage the clothes, but it is possible to repeat the same knocking operation to protrude and immerse the writing part of the ballpoint pen refill from the tip opening of the barrel, and the operation is extremely easy. It has certain advantages.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a state where a writing unit is immersed in a shaft cylinder.

FIG. 2 is a cross-sectional view showing a state in which a writing portion protrudes from a distal end opening of a barrel.

FIG. 3 is a cross-sectional view taken along line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 11 Front shaft 12 Rear shaft 13 Front opening 14 Tip opening 15 Slot 2 Ballpoint pen refill 21 Writing part 3 Clip 31 Locking projection 4 Knock member 41 Knock cover 5 Rotor 6 Vertical groove

Claims (1)

(57) [Claims] A ball-point pen refill containing water-based ink is accommodated in a barrel having a tapered tip at a tip thereof, and a knocking operation of pressing a knock member protruding from a tail end of the barrel is repeated. A knock-type water-based ball-point pen in which a writing portion at the tip of a ballpoint pen feels protrudes and retracts from a tip opening of a barrel, wherein a long hole is formed in the front end portion, and a fixing portion of a clip base end is provided at an edge of the long hole. engaged clip is rotatably arranged back and forth, when the writing of the ball point pen refill tip and ball point pen refill is advanced to protrude from the distal end opening of the barrel is advanced proximally along the tapered previous opening A knock-type water-based ball-point pen, characterized in that the clip is brought into close contact with the surface of the barrel and the locking projection of the clip is inserted into a hole formed in the barrel.