JP2022057453A - Retractable writing instrument - Google Patents

Abstract

To provide a retractable writing instrument that prevents an elastic member that repels a refill from being damaged or lost when the refill is replaced, and prevents a tip end of the refill from being damaged when a tip opening is attached.SOLUTION: There is provided a retractable writing instrument including a barrel 2 composed of a barrel body 10 and a tip opening 20. The inside of the barrel 2 includes a refill 3 that can move along an axial direction, a coil spring 7 that repels the refill 3 backward, and an annular member 8 disposed between the coil spring 7 and the refill 3. The refill 3 has a tip 40, and a tip holder 30 for holding the tip 40. The annular member 8 has an inner hole 8e, a locking portion 8a to which the coil spring 7 is locked, and an abutting portion with which the tip 40 or the tip holder 30 abuts. When the tip opening 20 is removed from the barrel body 10, a rear end of the annular member 8 is located behind a rear end of the tip opening 20. When the amount of protrusion of the rear end of the annular member 8 from the rear end of the tip opening 20 is X, the relational expression of X<1.5 mm is satisfied.SELECTED DRAWING: Figure 3

Description

The present invention relates to a haunting type writing instrument in which a tip can appear and disappear from the front end of the tip as the refill moves.

Conventionally, as a haunting type writing tool of this kind, as disclosed in Patent Document 1, for example,
A ballpoint pen refill for writing (hereinafter refill) is housed inside the shaft tube and the mouth tip (hereinafter referred to as the front mouth) screwed to the front part of the shaft cylinder, and a coil spring is booked between the refill and the tip mouth. A refill is urged to the rear, and a refill with a structure that can accommodate the refill drawn out from the tip opening of the tip by knocking back into the barrel by the elastic force of the coil spring is known. ..

Further, as described in Patent Document 1, this type of pay-out type writing tool has a convenient structure in which the refill can be removed from the inside of the shaft cylinder and replaced by releasing the screw between the tip and the shaft cylinder. Therefore, it is widely and generally used as a haunting type writing tool.

However, in the structure of Patent Document 1, although the coil spring is held by the inner wall of the tip of the tip, when the tip is removed from the barrel and the refill is replaced, the coil spring that protrudes rearward from the tip is provided. Since it can be easily removed because it can be gripped with a finger, the coil spring tilts when the coil spring comes off and is lost, or when the refill is replaced and the tip is screwed onto the barrel. There was a risk that the tip of the refill would get entangled and a problem would occur when the refill was fed out, or that the coil spring would be deformed and could not be used.

On the other hand, Patent Document 2 discloses a haunting type writing tool in which a slide member serving as an annular intermediate member is arranged between a coil spring and a refill.
In the structure of Patent Document 2, a plurality of types of refills having chips having different outer diameters can be attached by a slide member, and the refill is not directly supported by the coil spring but is supported by the slide member and the coil spring is attached and detached. Since it is installed so that it cannot be installed, it is possible to prevent the coil spring from being lost when the refill is replaced, and the coil spring from being entangled with the tip to prevent feeding failure and damage to the coil spring.

However, in the structure of Patent Document 2, the intermediate member is housed inside the front opening, and even if the front opening is removed from the barrel, the rear portion of the intermediate member cannot be seen. In addition, since the center of the tip is difficult to understand, the writing portion at the tip of the refill may hit the inner peripheral portion of the intermediate member, and the tip of the refill serving as the writing portion may be damaged.

Japanese Unexamined Patent Publication No. 2012-187715 Japanese Unexamined Patent Publication No. 2019-89272

The present invention has been made based on the above background, and an object thereof is that the coil spring that repels the refill is not damaged or lost when the refill is replaced, and the refill is attached when the tip is attached. It is to provide a haunting type writing tool that prevents the tip of the refill from being damaged.

The present invention comprises a refill composed of a refill body and a tip that is detachably attached to the front portion of the refill body, and is inside the refill in the axial direction of the refill. A refill for writing that can be moved along the refill, a coil spring that repels the refill rearward with respect to the front opening, and a coil spring disposed between the coil spring and the refill and along the axial direction of the barrel. The refill comprises a movable annular member, the refill having a chip with a writing section, and a chip holder located behind the chip to hold the chip, wherein the annular member is of the refill. It has an inner hole through which at least a part is inserted, a locking portion where the coil spring is engaged, and an abutting portion with which the chip or the chip holder abuts, and the tip is removed from the barrel body. In this state, when the rear end of the annular member is located behind the rear end of the front opening and the amount of protrusion of the rear end of the annular member from the rear end of the front opening is X, X < It is a haunting type writing tool characterized in that it is configured to satisfy a relational expression of 1.5 mm. In the present invention, the side where the front end of the barrel is located is expressed as the front side, and the opposite side is expressed as the rear side. Further, the central side where the refill is stored is expressed as the inner side of the cylinder, and the opposite side is expressed as the outer side.

According to the present invention, when the front end is removed from the barrel main body, the rear end of the annular member is located behind the rear end of the front opening, so that the rear portion of the annular member can be directly seen. Since it is easy to identify the center of the annular member when it is attached to the shaft cylinder, it is possible to reduce the risk of damaging the writing portion of the tip, which is the tip of the refill. Further, since the annular member can move back and forth in the front opening, the outer diameter of the rear end of the annular member is smaller than the outer diameter of the rear end of the front opening. Therefore, since the front end and the rear end of the annular member appear to be stepped so as to taper toward the rear, it becomes easier to determine the center position of the annular member. Further, since the annular member is locked to the coil spring and arranged between the annular member and the refill, the refill does not get entangled with the coil spring when the removed tip is attached to the axle cylinder, and the coil is used. It is possible to prevent the spring from being damaged. Furthermore, when the front end is removed from the barrel main body and the amount of protrusion of the rear end of the annular member from the rear end of the front end is X, the relational expression of X <1.5 mm is satisfied. In this case, it is difficult to directly grip the annular member with a finger or the like, so that the annular member is prevented from being lost due to coming off the tip or being damaged by stepping on it with a foot. can. The protrusion amount X is more preferably 0.4 mm <X <1.0 mm in consideration of the visibility of the annular member and the gripability with a finger.

Further, in a state where the front end is removed from the barrel main body, a tangent line connecting the outer peripheral surface portion of the rear end of the front end and the outer peripheral surface portion of the rear end of the annular member in the cross section along the axial direction of the barrel, and the shaft. When the angle of intersection with the axis along the axial direction of the cylinder is Y, it may be configured to satisfy the relational expression of Y ≧ 50 °. In this case, the tip is removed from the cylinder body. In this case, the length of the annular member protruding rearward from the rear end of the front opening is suppressed, which makes it difficult to grip with a finger, and the outer diameter of the rear end of the front opening and the outer diameter of the rear end of the annular member. Since the difference between the two and the refill becomes large, it becomes easier to identify the central portion when the refill is inserted into the annular member, which is preferable.

Further, the annular member may have a tapered portion at the rear end of the inner hole. In this case, when the tip opening is attached to the barrel main body, the tapered portion makes it easier to move the refill toward the center portion, and the tip of the refill is annular. Since it is possible to reduce the contact with the member, it is possible to further prevent the writing portion of the chip from being damaged.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a haunting type writing tool that prevents the coil spring that repels the refill from being damaged or lost when the refill is replaced, and prevents the tip of the refill from being damaged when the tip is reattached. ..

It is a vertical end view of the haunting type writing tool in one Embodiment of this invention. It is a vertical end view which shows the state which the refill of the haunting type writing tool of FIG. 1 has advanced. It is an enlarged vertical end view which shows the front part of the haunting type writing tool of FIG. It is an enlarged vertical end view which shows the tip mouth removed from the haunting type writing tool of FIG. It is explanatory drawing which shows the state which removes and reattaches the tip mouth from the haunting type writing tool of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a vertical end view of the haunting type writing tool 1 according to the first embodiment of the present invention, and FIG. 2 is a vertical end view showing a state in which the refill 3 of the haunting type writing tool 1 of FIG. 1 is advanced. FIG. 3 is an enlarged vertical sectional view showing a front portion of the haunting type writing tool 1 of FIG.

The infestation type writing tool 1 of the present embodiment shown in FIG. 1 is a haunting type ballpoint pen, and includes a shaft cylinder 2 having a front opening 2a at the front end. The shaft cylinder 2 is configured by attaching the tip 20 to the front portion of the cylindrical shaft cylinder body 10 so as to be detachably attached by screwing, and inside the shaft cylinder 2 in the axial direction of the shaft cylinder 2. A movable refill 3 is housed. As shown in FIG. 1, the refill 3 has an ink storage cylinder 30 on the rear side, and the chip 40 is fixed to the front side of the ink storage cylinder 30. Therefore, the ink storage cylinder 30 also has a function as a chip holder for holding the chip 40 in the present invention. The front portion of the tip 40 can appear and disappear from the front opening 2a of the barrel 2 as the refill 3 moves.

The appearance mechanism (not shown) of the present embodiment is a rear end knock type appearance mechanism using a rotary cam mechanism. The haunting mechanism engages with the rear tubular body 4 which is inserted into the shaft cylinder 2 from the rear opening of the shaft cylinder 2 and has a cam portion formed on the inner peripheral portion, and engages with the cam portion and hits the rear end of the refill 3. A rotating member 5 in contact with the rotating member 5, an operating body 6 that engages with the rotating member 5 and protrudes from the rear opening of the barrel 2, a coil spring 7 housed in the barrel 2 and urging the refill 3 rearward. Consists of. The operating body 6 is configured by press-fitting and fixing a rod-shaped portion 70 to the front portion of the operating portion 60.

Further, the infestation mechanism of the present embodiment is a double knock type in which both the pen tip protrusion operation and the pen tip immersion operation of the refill 3 press the operating body 6 forward. Specifically, when the operating body 6 is pressed forward while the refill 3 is immersed in the barrel 2, the refill 3 is moved to the front side, and the ink storage cylinder 30 (chip holder). The tip 40 fixed to the front portion of the cylinder 2 protrudes from the front opening 2a of the barrel 2 in the state shown in FIG. Then, the protruding state is maintained by the locking action between the cam portion (not shown) and the rotating member 5. When the operating body 6 is pressed forward while the tip 40 is protruding (the state shown in FIG. 2), the locked state between the cam portion and the rotating member 5 is released. As a result, the refill 3 is returned to the rear side by the action of the coil spring 7, and the tip 40 retracts from the front opening 2a of the barrel 2.

Subsequently, the chip 40 has a front end edge portion at the front end portion that can be annularly contacted with a part of the front side of the ball 50 and has an inwardly reduced diameter. As a result, the chip 40 functions as a holder for holding the ball 50. The size and shape of the front end edge portion are selected according to the size of the ball 50, and in the present embodiment, the diameter of the ball 50 is 0.50 mm, so that the tip inner diameter (narrowest diameter) of the front end edge portion is 0. It is 49 mm. As a result, a writing portion 80 is formed at the tip of the chip 40 in which the ink in the ink accommodating cylinder 30 is ejected to the writing surface via the ball 50 at the time of writing.

As shown in FIG. 3, the front opening 20 forms an inner hole portion penetrating along the axial direction, and the inner hole portion is formed with a plurality of step portions so as to reduce the diameter toward the front. .. Further, the coil spring 7 is press-fitted and mounted on the front inner stage portion 20a, which is one of the inner stage portions, to the extent that the expansion and contraction of the spring is not affected, so that the coil spring 7 cannot be easily removed. .. Further, a female screw portion 20b is formed in the rear portion of the inner hole portion, and is detachably screwed to the male screw portion 10a formed in the front inner peripheral portion of the barrel main body 10.

An annular member 8 is disposed at the rear portion of the coil spring 7, and the rear portion of the coil spring 7 is locked to the outer peripheral locking portion 8a formed on the outer peripheral portion of the annular member 8. Further, the tip 40 of the refill 3 and the ink accommodating portion 30 (tip holder) are inserted into the inner hole 8e of the annular member 8, and both the annular member 8 and the refill 3 have a shaft cylinder 2 (tip port 20 and a shaft cylinder main body). 10) It is housed inside so as to be movable in the front-rear direction along the axial direction.

Further, a tapered portion 8b whose diameter expands toward the rear is formed in the rear portion of the inner hole 8e of the annular member 8, and when the refill 3 is inserted into the annular member 8, the tapered portion 8b is used to reach the tip of the refill 3. Since a certain chip 40 can be easily moved to the central portion of the annular member 8, the writing portion 80 at the tip of the chip 40 can be prevented from coming into contact with the annular member 8 and being damaged. An inner step portion 8c is formed in the front portion of the inner hole 8e of the annular member 8, and the inner step portion 8c serves as a contact portion with which the front end portion of the ink storage cylinder 30 of the refill 3 abuts. The annular member 8 is configured to support the refill 3, whereby the elastic force of the coil spring 7 is transmitted to the refill 3 via the annular member 8.

Next, a state in which the tip 20 is removed from the barrel main body 10 will be described with reference to FIGS. 4 and 5. FIG. 4 is an enlarged vertical cross-sectional view showing the tip 20 removed from the haunting writing tool 1 of FIG. 1, and FIG. 5 shows a state in which the tip 20 is removed and reattached from the haunting writing tool 1 of FIG. It is explanatory drawing.

As shown in FIG. 4, when the female screw portion 20b of the front opening 20 and the male screw portion 10a of the shaft cylinder main body 10 are unscrewed from the state of FIG. 1 and the front mouth 20 is removed from the shaft cylinder 2, the coil is formed. When the spring 7 extends to the natural length of the spring, the annular member 8 retracts, and the rear end of the annular member 8 protrudes rearward from the rear end of the front opening 20. At this time, when the amount of protrusion of the rear end of the annular member 8 from the rear end of the front end 20 to the rear is X, it is preferable to satisfy the relational expression of X <1.5 mm. Since it becomes difficult to directly grasp the annular member with a finger due to the small protrusion amount, it is possible to prevent the annular member 8 and the coil spring 7 from coming off from the tip port 20, so that the coil spring 7 and the annular member 8 can be prevented from coming off. It is possible to prevent loss or damage. Further, since the rear end of the annular member 8 protrudes at least rearward from the rear end of the front opening 20, as shown in FIG. 5, when the front opening 20 is reattached to the barrel main body 10, the front opening is used. Since the outer diameter of the rear end of the annular member 8 is smaller than the outer diameter of the rear end of the annular member 20, the front opening 20 and the rear portion of the annular member 8 appear to be tapered toward the rear. Therefore, the user can easily identify the central portion of the tip 20, and when the refill 3 is inserted into the inner hole 8e of the annular member 8, the writing portion 80 at the tip of the tip 40 abuts on a part of the annular member 8. By doing so, the risk of damage to the writing unit 80 can be reduced. The protrusion amount X of the annular member 8 is more preferably 0.4 mm <X <1.0 mm in consideration of the visibility of the annular member 8 and the gripability with a finger, and in the present embodiment, the protrusion amount X is set. By setting it to 0.75 mm, the visibility of the annular member 8 can be obtained while ensuring the difficulty of gripping the annular member 8.

Further, as shown in FIG. 4, in a state where the front opening 20 is removed from the barrel main body 10, the outer peripheral surface portion 20c of the rear end of the front opening 20 and the rear end outer surface portion 8d of the rear end of the annular member 8 are connected. When the angle of the intersection angle between the tangent line S and the center line C, which is the axis line along the axial direction of the barrel, is Y, the relational expression of Y ≧ 50 ° may be satisfied. When the front opening 20 is removed from the barrel main body 10, the length of the annular member 8 protruding rearward from the rear end of the front opening 20 is suppressed, which makes it difficult to grip with a finger. Since the difference between the outer diameter of the rear end of the front opening 20 and the outer diameter of the rear end of the annular member 8 becomes large, it is preferable because it becomes easier to identify the central portion when the refill 3 is inserted into the annular member 8. Is. In the present embodiment, since the angle Y of the intersection angle is configured to be 62 °, it is difficult to directly grip the annular member 8 with a finger, and it is difficult to identify the tip portion 20 and the central portion of the annular member 8. It is easy to do so, and when the refill 3 is inserted into the inner hole 8e of the annular member 8, the writing portion 80 at the tip of the tip 40 comes into contact with the annular member 8 to prevent damage.

1 ... Haunting writing tool,
2 ... Axle cylinder, 2a ... Front opening,
3 ... Refill,
4 ... Rear cylinder,
5 ... Rotating member,
6 ... Operation body,
7 ... Coil spring,
8 ... annular member, 8a ... locking portion, 8b ... tapered portion, 8c ... inner stage portion (contact portion),
8d ... Rear end outer peripheral part, 8e ... Inner hole,
10 ... Shaft cylinder body, 10a ... Male screw part,
20 ... front opening, 20a ... front inner stage portion, 20b ... female screw portion, 20c ... outer peripheral surface portion,
30 ... Ink storage cylinder (chip holder),
40 ... Chip,
50 ... ball,
60 ... Operation unit,
70 ... rod-shaped part,
80 ... Writing department,
C ... Center line,
S ... Tangent,
X ... Protrusion amount,
Y ... Crossing angle.

Claims (3)

It is equipped with a shaft cylinder composed of a shaft cylinder body and a tip that is detachably attached to the front part of the shaft cylinder body.
Inside the barrel, a refill for writing that can move along the axial direction of the barrel, a coil spring that repels the refill backward with respect to the tip, and the coil spring and the refill. An annular member disposed between and movable along the axial direction of the cylinder is provided.
The refill has a chip with a writing section and a chip holder located behind the chip to hold the chip.
The annular member has an inner hole through which at least a part of the refill is inserted, a locking portion where the coil spring is engaged, and an abutting portion with which the tip or the tip holder abuts.
In a state where the front end is removed from the barrel main body, the rear end of the annular member is located behind the rear end of the front opening, and the rear end of the annular member protrudes from the rear end of the front opening. A haunting type writing tool characterized in that it is configured to satisfy the relational expression of X <1.5 mm when the protrusion amount is X. In a state where the front end is removed from the barrel main body, the outer peripheral surface portion of the rear end of the front end and the rear end outer surface portion of the rear end of the annular member are connected in a cross section along the axial direction of the barrel. The haunting type writing tool according to claim 1, wherein the relational expression of Y ≧ 50 ° is satisfied when the angle of the intersection angle between the tangent line and the axis line along the axial direction of the barrel is Y. The haunting type writing tool according to claim 1 or 2, wherein the annular member has a tapered portion at the rear end of the inner hole.

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