JPH09226292A - Knocking-type water ball-point pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knocking-type water ball-point pen with a safety clip which enables the protrusion and retraction of a writing part at the tip of a refill in a ball-point pen by operation of the same knocking part. SOLUTION: In a knocking-type water ball-point pen with the writing part 21 at the tip of a refill to be protruded from and retracted into the member, a tapered part 13 is formed near the tail end of the shaft cylinder 1 and a long hole 15 is perforated in this tapered part 13. Further, the fixed part of a clip base end is engaged with the edge of the long hole 15 in such a manner that a clip is movable forward/backward. When the writing part 21 is protruded from the tip opening 14 of the shaft cylinder, the clip base end advancing along the tapered part tightly sticks to the surface of the shaft cylinder and the engaging protruding part 31 of the clip is sunken into a hole 16 formed in the shaft cylinder.

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 housed in a barrel.

[0002]

2. Description of the Related Art In a knock type oil-based ballpoint pen, the writing portion at the tip of the ballpoint pen refill is projected and retracted from the tip opening of the barrel by repeating a knocking operation of pressing a knock member protruding from the tail end of the barrel. Many of them are of the double knock type, but this double knock type has the advantage that the retracting operation is extremely easy.

As the double knock mechanism, "rotary knock type" and "heart type" are widely put into practical use. In the rotary knock type, the engaging part of the rotor is fitted into the vertical groove between the vertical ribs formed in the shaft cylinder, and when the knocking operation is performed, the knocking member advances with the rotational force applied to the rotor. Then, when the engaging portion of the rotor comes out of the vertical groove of the barrel and rotates by a predetermined angle to engage with the end of the vertical rib, this causes the writing portion at the tip of the ballpoint pen refill to protrude from the tip opening of the barrel. ,
Receives pen pressure. Then, when the knock operation is performed again,
The rotor to which a rotational force is applied is rotated by a predetermined angle, the locking portion of the rotor is again fitted into the vertical groove and retracts, and the writing portion at the tip of the ball-point pen refill sinks into the barrel.

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 and 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 the writing pressure. Then, when the knock operation is performed again, the cam follower retracts along the cam groove, and the writing portion at the tip of the ballpoint pen refill sinks into the barrel.

By the way, the knock type water-based ballpoint pen is
If the writing part at the tip of the ballpoint pen refill projects from the tip opening of the barrel when stored in a pocket, when the writing part adheres to the cloth, the water-based ink with low viscosity spreads widely on the cloth due to the capillary phenomenon of the cloth. Penetrate. For this reason, when the writing portion at the tip of the ball-point pen refill projects from the tip opening of the barrel, a safety clip is often used so that it cannot be mounted in the pocket.

[0006]

Various safety clips have been proposed and put to practical use. For example, when a knock operation is performed, the safety clip is integrated with a knock member protruding from the tail end opening of the shaft cylinder. The clip is moved forward and the writing part at the tip of the ball-point pen refill projects from the tip opening of the barrel.At this time, the engaging protrusion at the tip of the clip for press contacting the cloth is formed in the barrel. It engages with and receives the writing pressure. Therefore, it cannot be installed in the pocket in this state, and if you force it into the pocket,
The cloth that enters between the shaft cylinder and the clip releases the engagement between the engagement protrusion of the clip tip and the hole of the shaft cylinder, and the writing portion at the tip of the ball-point pen refill sinks into the shaft cylinder.

As described above, the safety clip is used as a member for receiving the writing pressure at the engaging projection of the clip tip. Therefore, when the writing section at the tip of the ballpoint pen refill is retracted into the barrel, the clip is clipped. It is necessary to push or lift a part of the clip to rotate it to disengage the engagement projection of the clip tip and the hole of the barrel. That is, there is a problem that the operation is complicated when the writing portion at the tip of the ball-point pen refill is projected and when the writing portion is retracted, and the operation is complicated.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a knock type water-based ballpoint pen in which the writing portion at the tip of the ballpoint pen refill can be projected and depressed by the same knocking operation.

[0009]

In order to achieve the above object, the present invention provides a knock for accommodating a ball-point pen refill containing water-based ink in a barrel and pressing a knock member protruding from the tail end of the barrel. By repeating the operation,
In a knock type water-based ballpoint pen in which the writing part at the tip of the ball-point pen refill protrudes from the tip opening of the barrel, forms a tapered portion near the tail end of the barrel and forms a long hole in this tapered portion to fix the clip base end. When the writing part at the tip of the ball-point pen refill advances and the writing part at the tip of the ball-point pen re-fill projects from the tip opening of the barrel, the base end becomes a taper part. The clip advanced along the above is brought into close contact with the surface of the barrel, and the locking projection of the clip is set in the hole formed in the barrel.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. In FIG. 1, the shaft cylinder 1
Is composed of a front shaft 11 and a rear shaft 12 injection-molded of synthetic resin, the front shaft 11 has a front end opening 14, and the rear shaft 12 has a tail end opening 17. A tapered portion 13 having a large diameter on the tail end side is formed near the tail end of the rear shaft 12,
A longitudinal elongated hole 15 is formed in the tapered portion 13. Further, the rear shaft 12 is formed with a hole 16 into which the locking projection 31 of the clip 3 is inserted.

A ball-point pen refill 2 containing water-based ink is housed in the barrel 1 in a state of being elastically bulged toward the tail end side by a spring 22. Ballpoint pen refill 2
Is a writing part 2 that holds a ball freely at its tip.
One. The tail end of the ball-point pen refill 2 is provided with a knock member 4 which is a component of the heart-shaped retracting mechanism.
Is in contact with

The retracting mechanism in this embodiment is a well-known heart type retracting mechanism, and this retracting mechanism comprises a knock member 4, a rotating cam 5, and a cam follower 18 formed on the inner peripheral surface of the barrel 1. Has been done. That is, the knock member 4
The knock cover 41 is fitted to the tail end of the so as to project from the tail end opening 17. Therefore, the knock member 4 and the knock cover 41 form a knock member in a broad sense. A rotary cam 5 is rotatably arranged on the outer periphery of the knock member 4, and a substantially heart-shaped cam groove 51 having engaging portions on the upper and lower portions is formed on the outer periphery of the rotary cam 5. And
The cam follower 18 is fitted in the cam groove 51.

Therefore, when the knock cover 41 is pressed to perform the knocking operation, the ball-point pen refill 2 advances and the writing portion 21 projects from the tip end opening 14. At this time, the cam follower 18 lowers the cam groove 51. It is designed so that it can be locked to the locking part of and to receive the writing pressure.

When the knocking operation is performed again from this state, the knocking member 4, and hence the rotary cam 5 is moved forward a little and the engagement between the cam follower 18 and the engaging portion at the lower part of the cam groove 51 is released, and the knocking operation is performed. When released, the rotating cam 5 rotates, the ball-point pen refill 2 retreats, and the writing unit 12 moves to the barrel 1.
It is designed to immerse inside. In the above embodiment, the retracting mechanism is of the heart type, but it may be of the rotating knock type or the like. In short, by repeating the knocking operation, the writing portion 21 causes the tip opening 14 of the barrel 1. Any projecting and immersing process may be used.

A bifurcated fixing portion 32 is attached to the base end 3a of the clip 3, and the fixing portion 32 is inserted into the rear shaft 12. The fixing portion 32 is fitted into the small diameter portion 42 of the knock cover 41, and the knock cover 4
When 1 is moved back and forth by a knocking operation, the clip 3 is also moved back and forth. Further, as shown in FIG. 3, the locking recess 32 a of the fixed portion 32 is engaged with the edge 15 a of the elongated hole 15. Therefore, the clip 3 has its base end 3 a moved back and forth along the tapered portion 13. That is, clip 3
As the clip 3 moves backward, the gap with the shaft cylinder 1 becomes smaller and sinks, and conversely, as the clip 3 retracts, the gap with the shaft cylinder 1 becomes larger and rises.

When the knock cover 41 is pressed with a fingertip to perform a knocking operation from the state shown in FIG. 1, the ballpoint pen refill 2 advances and the writing portion 21 projects from the tip opening 14 as described above, and writing is possible. However, as the ball-point pen refill 2 advances, the clip 3 also advances, and as shown in FIG. 2, the clip 3 comes into close contact with the barrel 1 and the locking projection 31 is inserted into the hole 16 formed in the barrel 1. Immerse yourself. That is, when the writing portion 21 projects from the tip opening 14 and is capable of writing, the clip 3 loses the original function of the clip and cannot be mounted in the pocket, and functions as a safety clip.

Next, when the knock cover 41 is pressed again with the fingertip to perform the knocking operation from the state shown in FIG. 2, the ballpoint pen refill 2 retracts and the writing portion 21 is retracted into the barrel 1 as described above. However, since the clip 3 also retracts and returns to the state shown in FIG. 1, it can be mounted in the pocket.

[0018]

As described above, the knock type water-based ballpoint pen of the present invention has the safety clip, and is mounted in the pocket when the writing portion of the ballpoint pen refill protrudes from the tip opening of the barrel and is capable of writing. It is not possible to stain the clothes, but it is possible to project and retract from the tip opening of the barrel of the writing part of the ballpoint pen refill by repeating the same knocking operation, which is extremely easy to operate. It has certain advantages.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where a writing unit is immersed in a barrel.

FIG. 2 is a cross-sectional view showing a state in which a writing portion projects from a tip opening of a barrel.

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

[Explanation of symbols]

 1 Shaft cylinder 11 Front shaft 12 Rear shaft 13 Tapered portion 14 Tip opening 15 Long hole 18 Cam follower 2 Ballpoint pen refill 21 Writing portion 3 Clip 31 Locking protrusion 32 Fixing portion 4 Knock member 41 Knock cover 5 Rotating cam 51 Cam groove

Claims (1)

[Claims] 1. A ball-point pen refill containing water-based ink is housed in the barrel, and a knocking operation of pressing a knocking member protruding from the tail end of the barrel is repeated, so that the writing portion at the tip of the ball-point refill is made into the barrel. A knock type water-based ballpoint pen protruding and retracting from a tip opening, wherein a tapered portion is formed in the vicinity of the tail end of the barrel and a long hole is formed in the tapered portion, and a fixing portion at a clip base end is an edge of the long hole. The clip is arranged so that it can be attached to the front and back,
When the ball-point pen refill advances and the writing part at the tip of the ball-point pen reef projects from the tip end opening of the barrel, the clip whose base end has advanced along the taper portion adheres to the barrel surface, and the locking protrusion of the clip A knock type water-based ballpoint pen characterized by being immersed in a hole formed in a barrel.