JPH11129685A - Writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an advancing/retracting operation of a pin tip in such a manner that a force to resist in the repulsive direction may not be applied, and reduce the force required for the operation of an operation piece by a method wherein a refill is urged forward, and at the same time, on the refill, a rear engaging part and a forward engaging part which respectively present a projected state and a sunk state of a pen tip, are formed. SOLUTION: When an operation piece 6 is pressed in the central direction of a rear shaft 2, an engagement between a refill 5 which is urged forward and the operation piece 6 is released by a coil spring 3, and the refill 5 moves forward. Then, the operation piece 6 is repulsed to the outside when the pressing is released, and is engaged with a rear engaging part 15, and forms a projected state of a pen tip 4. In the meantime, when the pen tip 4 is pressed to a paper surface or the like while pressing the operation piece 6, a front engaging part 14 of the refill 5 is lowered to an engaging part 16 of the operation piece 6 and is engaged, and the refill 5 is fixed. When the pressing to the paper surface is released, by the repulsive force of a coil spring 7, a front shaft 8 returned to the original position, and the refill 5 is completely housed in the front shaft 8 and the rear shaft 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refill which is housed in a bore of a barrel so as to be able to move back and forth by manipulating an operation piece disposed on a side surface of the barrel, and a refill is provided at the tip of the refill. The present invention relates to a writing instrument having a fixed pen tip protruding and retracting from an opening at the tip of a barrel.

[0002]

2. Description of the Related Art Conventionally, a cam mechanism is used as a pen tip protruding and retracting mechanism, and a refill urged rearward by a coil spring, which is a resilient member, appears and retracts, and an operation piece connected to the refill. To protrude the refill urged backward by the spring from the tip of the barrel,
At the same time, the operating piece is locked to the barrel to form a protruding state from the barrel of the pen tip, and the locking between the operating piece and the barrel is released and a retractable writing instrument such as one that accommodates a refill is known. Have been. There is also known a so-called side slide type retractable writing instrument in which an operation piece is arranged on a side portion of a barrel. Unlike the side-sliding type, which has an operating piece protruding from the rear end of the barrel, the pen tip can be moved out of the tip of the barrel while holding the barrel in the writing state. Yes, it is easy to use.

[0003]

However, in the above-mentioned side-slide type writing instrument, the refill built in the shaft is urged rearward by a resilient member such as a spring. On the contrary, it is necessary to operate the knock member and the like, and in order to perform this operation with one finger, it is surprisingly necessary to perform the operation, and the resilient force which can secure a reliable storage state is maintained. However, there has been a demand for a device that can be operated with an extremely weak force and that can be operated while holding a writing instrument in a writing state. In addition, in order to protect the pen tip in the refill storage state, it is necessary to completely store the refill, and there is a problem in that the refill travel distance when appearing and retracting is long, which is against the simplicity of the intrusion operation. .

[0004]

That is, according to the present invention, by operating an operating piece disposed on a side surface of a shaft cylinder, a refilling operation is performed for a refill housed in a shaft cylinder inner hole so as to be movable back and forth, In a writing instrument in which a pen tip fixed to the tip of a refill is made to protrude and retract from an opening at the tip of the barrel, the refill is urged forward by a resilient member, and the refill corresponds to an engaging portion of an operation piece. The writing implement is characterized in that a rear locking portion for forming a pen tip protruding state and a front locking portion for forming a pen tip immersing state are formed.

[0005]

[Operation] The pen tip can be made to protrude and retract by operating the operating piece so as not to apply a force against the repelling member that urges the refill such as a spring in the repelling direction. By performing only locking / unlocking, the force required to operate the operation piece can be minimized.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a writing instrument according to the present invention. One example shown in FIGS. 1 to 3 is basically a rear shaft 2 having an operation piece insertion hole 1 formed in a side surface, and a coil housed in the rear shaft inner hole and installed at the bottom of the rear shaft inner hole. The tip which is urged forward by the spring 3
, An operating piece 6 protruding outward from the operating piece insertion hole 1, and a front shaft 8 slidably attached to the front end of the rear shaft via a coil spring 7.
(Hereinafter, the pen tip 4 side is referred to as a front side).
Note that the coil spring 7 may be fixed to the rear end of the refill 5. In this case, it is easy to position the coil spring 3 at the bottom of the rear shaft 2 of the bottomed cylindrical body.

The rear shaft 2 has a bottomed cylindrical shape, and has a small-diameter portion 9 defining the sliding range of the front shaft 8 on the front side, and a flange 10 for preventing the front shaft 8 from slipping off at the foremost portion. The front shaft 8 has a pen tip protruding hole 11 at the tip, a step 12 for disposing the coil spring 7 therein, and a jaw 13 at the rear end capable of engaging with the flange 10 of the rear shaft 2. doing. When the front shaft 8 is pressed by holding the rear shaft and making contact with the paper surface, the front shaft 8 slides on the small diameter portion 9 of the rear shaft 2 to reduce the overall length.

The refill 5 is supposed to be an ink storage member that press-fits and fixes the pen tip 4 at the tip of a synthetic resin pipe body and stores free ink therein. Even if it keeps
It may be an ink storage member having a metal shaft cylinder,
On the side wall, there are a front engagement concave portion 14 for maintaining the stored state of the pen tip 4 and a rear engagement concave portion 15 for maintaining the pen tip 4 in the protruding state as portions where the operation piece 6 is engaged.

As shown in FIG. 2, which is a cross-sectional view taken along the line II in FIG. 1, the operation piece insertion hole 1 in the side wall of the rear shaft 2 has an engagement portion 16 for the refill 5 and an operation portion. 17 is inserted, and a coil spring 18 is arranged between the operation piece 6 and the step formed in the operation piece insertion hole 1 so that the operation piece 6 is urged outward of the rear shaft 2. I have. As a result, when no pressing force is applied to the operation unit 15 of the operation piece 6, a force acts to pull the refill 5 outward. That is, when the front engagement recess 14 or the rear engagement recess 15 of the refill 5 and the engagement portion 16 of the operation piece 6 are located, the refill 5 and the operation piece 6 are engaged. Here, the engaging portion 16 of the operation piece 6 has a diameter larger than the width of the operation piece insertion hole 1, so that even when the refill 5 is not in the shaft cylinder, for example, when the refill 5 is replaced, the rear shaft 2 is attached. It is designed to be locked.

As shown in FIG. 3 showing the pen tip 4 in a protruding state, when the operating piece 6 is pressed toward the center of the rear shaft 2,
Refill 5 biased forward by coil spring 3
Is disengaged from the operation piece 6, and the refill 5 moves forward. When the pressing on the operation piece 6 is released, the operation piece 6 is repelled outward and engages with the engagement concave portion 15 to form a protruding state of the pen tip 4 from the front shaft 8 that can withstand writing pressure during writing. .

To change the pen tip from the projected state to the stowed state, the pen tip 4 is pressed against the paper while pressing the operation piece 6. Then, at the stage where the pen tip 4 is accommodated in the front shaft 8, when the front end of the front shaft 8 is pressed as it is in contact with the paper surface, the front shaft 8 is retracted in the rear axial direction, and the front engagement concave portion 14 of the refill 5 is engaged with the operation piece. At the stage where the refill 5 has been lowered to the position of the engaging portion 16, the refill 5 is fixed. When the pressing on the paper is released, the front shaft 8 returns to the original position by the resilience of the coil spring 7, and the refill 5 is completely accommodated inside the front shaft 8 and the rear shaft 2.

FIGS. 4 and 5 show another example. FIG. 4 shows a state in which the pen tip 4 is stored, and FIG. 5 shows a state in which the pen tip 4 is projected (writable state). The point where the refill 5 is urged forward by the coil spring 3 or the refill 5
The front engagement concave portion 14 and the rear engagement concave portion 15 are formed in advance to engage with the engaging portion 16 of the operation piece 6 to form the pen tip 4 in the projected state and the pen tip 4 stored state. This is similar to the above example. The difference is that the operation portion 17 of the operation piece 6 has a tapered shape that is inclined in the diameter decreasing direction toward the front, the rear portion of the front shaft 8 is extended, and the grip portion 19 is gripped during writing, and the refill 5 is accommodated. Instead of pushing the operating piece 6 with a finger to release the engagement with the refill 4, the operating piece 6 is moved to a position inside the front shaft 8 by pressing the rear portion of the rear shaft 2, and the taper of the operating piece 6 is adjusted. The engagement with the refill 5 is released by pressing the operating portion having the shape of a letter.

[0013]

According to the writing instrument of the present invention, the operation of extending and retracting the pen tip only requires releasing / locking the lock between the operation piece and the refill, and can be easily and reliably operated without requiring much force. It is something.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example.

FIG. 2 is a sectional view taken along the line II in FIG. 1;

FIG. 3 is a cross-sectional view showing the pen tip of FIG. 1 in a protruding state;

FIG. 4 is a sectional view showing another example.

FIG. 5 is a cross-sectional view showing the pen tip protruding state of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operation piece insertion hole 2 Rear shaft 3 Coil spring 4 Pen tip 5 Refill 6 Operation piece 7 Coil spring 8 Front shaft 9 Small diameter part 10 Flange part 11 Pen tip protrusion hole 12 Step part 13 Jaw part 14 Front engagement recess 15 Mating recess 16 Engagement part 17 Operation part 18 Coil spring 19 Grip part

Claims (2)

[Claims] An operation piece disposed on a side surface of a barrel is operated to reciprocate a refill housed in a bore of the barrel so as to be movable back and forth. In a writing instrument which is protruded and retracted from an opening at the tip of a barrel, the refill is urged forward by a resilient member, and the refill is formed with a pen tip protruding state corresponding to an engaging portion of an operation piece. A writing instrument comprising a locking portion and a front locking portion for forming a pen tip immersed state. 2. A rear shaft having an insertion hole for inserting the operation piece into the shaft cylinder, a front shaft which is engaged with the rear shaft and is slidable back and forth, and has a pen tip protruding hole at the tip. The writing implement according to claim 1, wherein a repelling member is interposed between the front shaft and the rear shaft.