JP2001191684A - Retractable writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to prevent the tip of a pen point part from being a symmetrically worn by a method wherein a refill is rotated in matching with the rotation of a rotor in a retractable writing utensil, which is equipped with a delivering mechanism employing the rotor so as to make it possible to retract and extend the pen point part of the tip of the refill through the tip opening part of a barrel. SOLUTION: In the retractable writing utensil, in which the refill 9 with the ink for a writing utensil housed therein, is slidably housed in the barrel under the state being energized backwards by a return spring 13 and a retracting mechanism part is formed by fittingly and axially shiftably installing a pushing rod 6 with a cam part engaging with a cam groove and a rib and a rotor 7 in a cam part formed in the barrel, the refill 9 and the rotor 7 are connected to each other under the state that a sliding member 15 is pinched between the return spring 13 and the barrel 1, the refill 9 is made smoothly rotatable together with the rotation of the rotor 7. Further, by pinching the sliding member 15 between the return spring 13 and the refill 9, the refill 9 is also made smoothly rotatable together with the rotation of the rotor 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock-type writing instrument which is capable of protruding and retracting from a tip end opening of a shaft cylinder at the tip of a refill by pressing a knock rod.

[0002]

2. Description of the Related Art Conventionally, there has been provided a feeding mechanism which pushes a knock bar to rotate a rotor in a cam portion in a barrel, thereby causing a pen tip portion of a refill tip to protrude and retract from a tip opening of the barrel. Knock-type writing instruments are well known.

[0003] The refill containing the ink for the writing instrument in the knock-type writing instrument is urged rearward by a return spring to slide into the shaft cylinder in order to allow the pen tip to protrude and retract from the opening at the tip of the shaft cylinder. It is stored freely.
At the time of writing, the rotor is rotated by pressing the knock bar, but at present, the refill does not rotate in accordance with the rotation of the rotor.

[0004]

By the way, a writing instrument has a structure in which a clip is attached so that almost anything can be clamped in a pocket or the like. Therefore, when writing,
In order to prevent the clip from getting in the way or to feel uncomfortable when touching the hand, for example, the position for holding the writing instrument of the individual, such as holding the clip upward, is always the same. I rarely change my position every time I write.

For this reason, if only the same portion of the pen tip is used at the time of writing, if the pen tip is a ballpoint pen tip, the tip opening of the tip holding the ball and the ball receiving seat are not used. A writing load is applied only to the same portion, and only that portion is unevenly worn. As a result, there is a case where blurring or blurring of a handwriting line occurs due to ink leakage from the tip of the chip or ink outflow caused by uneven rotation of the ball. Also, in the case of oil-based ballpoint pens that use medium- and high-viscosity inks whose main solvent is a non-drying or non-volatile solvent that is generally said to be resistant to such chip wear, when the ball diameter is less than 0.7 mm Tends to suffer from such uneven wear. (Note that the lower limit of the ball diameter that is usually considered in the design of an oil-based ballpoint pen tip is 0.1 mm.) Even when the ball diameter exceeds 0.7 mm, a water-based ink that is more susceptible to wear was used. In ballpoint pens, the adverse effects of uneven wear were even more pronounced. (The ball diameter usually considered in the design of a water-based ball-point pen tip is in the range of 0.1 to 1.5 mm.) In the case of a felt-tip pen, the pen tip is unevenly worn and a stable drawing line is obtained. There is a problem that it cannot be obtained.

In order to solve the above problem, the refill is rotated each time the knocking is performed by connecting the refill and the rotor. However, the end face of the return spring rubs the shaft body and does not rotate smoothly or is damaged. There was a problem such as end up. At this time, it was thought that the problem could be solved by reversing the direction of rotation of the spring with respect to the direction of rotation of the refill. However, a sufficient effect could not be obtained when burrs during manufacture remained on the end surface of the spring. To solve this, burring can be performed by tumbling the spring, but the tumbling may cause the springs to become entangled or deformed, resulting in a certain shape and performance. There is a new problem that cannot be done.

[0007]

In order to solve the above-mentioned problem, a knock-type writing instrument according to the present invention is provided. A knock mechanism and a knock rod having a cam part and a rib that engage with the cam groove and a rotor are freely slidably housed in a cam part formed in the shaft cylinder. In the knock-type writing instrument, a sliding member is interposed between the return spring and the shaft cylinder, and the refill and the rotor are connected to form a structure in which the refill rotates smoothly with the rotation of the rotor. Or
A sliding member is interposed between the return spring and the refill so that the refill rotates smoothly with the rotation of the rotor.

[0008]

1 to 13 show a first embodiment of the present invention. First, as shown in FIG. 1 and FIG.
Is urged rearward by a return spring 13 and slidably housed in the shaft cylinder. Further, a window 16 is provided on the side wall of the barrel 1.
Is formed

As shown in FIGS. 4 and 5, the cam barrel 3 is a tubular body having a crown portion 5 with a slightly increased diameter formed at the rear end. A projection 26 for connecting to the shaft body 1 is formed on the outer wall surface of the cam cylinder 3. Further behind the inner hole 17 of the cylindrical body,
A cam portion 18 in which ribs 19 and cam grooves 20 are alternately formed radially on the inner wall is provided. A projection 15 for fitting with the shaft cylinder 1 is formed on a part of the outer periphery in front of the crown of the cylinder. The cam groove 20 has radially deep cam grooves 20a and shallow cam grooves 20b formed alternately.
9 and the slope 21 toward the tip of the shallow cam groove 20b.
Are formed.

FIGS. 6 and 7 show the rotor 7. A cam groove 20 of the cam cylinder 3 is provided at a required location on the outer periphery of the rotor 7.
A rib 23 corresponding to the assigned position and an inclined cam portion 22 are formed at the tip thereof, and a continuous mountain-shaped cam portion is formed in a circumferential shape. A rib 7b for connecting the rotor and the refill is formed on a contact surface 7a between the rotor 7 and the refill 9.

FIGS. 8 to 10 show a knock bar.
A rib 25 which fits into the cam groove 20 of the cam cylinder 3 is formed at a required location on the outer periphery of the front part of the knock bar 6, and a cam part 24 which engages with the mountain-shaped cam part of the rotor 7 is formed at the tip. Is formed.

The refill 9 has a tip 12 of a ballpoint pen fixed to the tip of a tube 10 filled with ink 14.
A crimp 11 is formed at a front portion of the tube 10. The refill 9 is inserted into the inner hole of the barrel 1 with the rear end of the return spring 13 in contact with the crimp 11, and the front end of the return spring 13 contacts the sliding member 15. It contacts the step formed at the tip of the inner hole.

The knock rod 6 and the rotor 7 are connected to the inner hole 1 of the cam cylinder 3.
7 and the rib 25 of the knock bar 6 is
Fit into The rotor 7 is inserted on the side where the cam portion 22 is in contact with the cam portion 24 of the knock bar 6, and the rib 23 is fitted only in the deep cam groove 20a. At the retracted position of the knock bar 6 in which the rib 23 is fitted in the cam groove 20 a, the peak of the mountain portion of the cam portion 24 of the knock bar 6 is shifted to the inclined portion slightly shifted from the top of the mountain-shaped cam portion of the rotor 7. Abut. When the rib 23 of the rotor 7 is disengaged from the cam groove 20a in a state where the knock bar 6 is advanced, the rotor 7 is moved so that the top of the cam portion 24 is fitted to the valley of the mountain-shaped cam portion of the rotor 7. Is slightly rotated. When the advance of the knock bar 6 is released in this state, the top of the cam portion 22 of the rotor 7 is rotated while sliding on the radial slope of the cam portion 18 of the cam cylinder, and positioned at the end of the slope 21 at the position of the cam groove 20b. Then, the rotor 7 is set to the forward position. Hereinafter, the rotor 7 is rotated by the forward and backward movement of the knock bar 6, and is positioned at the forward / backward position. In addition, the cam cylinder 3, the knock bar 6,
The knocking mechanism section constituted by the rotor 7 has a configuration equivalent to that of a Kern-type knocking mechanism well known as a knocking-type ballpoint pen. Further, a slot is formed on the front inner periphery of the inner hole 17 of the cam cylinder 3 so that the protrusion and the front part can be easily expanded, and the rotor 7 is elastically fitted. , So that it cannot be extracted. (Not shown)

As described above, the cam cylinder 3 having the knock mechanism is fitted into the rear hole of the shaft cylinder. Also refill 9
A rib 7b on the front surface of the rotor 7 is press-fitted into the rear end of the rotor 7 and connected thereto. In the embodiment, a knock cover 8 is provided at the rear end of the knock bar 6.
Is fixed.

FIGS. 11 to 13 show a second embodiment. In the second embodiment, a sliding member is provided between the refill and the spring as shown in FIG. Other configurations are the same as those of the first embodiment, so that the same effects as those of the first embodiment can be obtained.

[0016]

The operation based on the above embodiment will be described below. First, when the rear end of the knock cover 8 is knocked from the state of FIG. 1 and the knock bar 6 is advanced, the rotor 7 is rotated and positioned at the advanced position, and the ballpoint pen tip 12 protrudes from the distal end port 2. The writing state shown is reached. Further, when knocking from this state, the rotor 7 rotates to the retracted position, and the tip 12 is immersed from the distal end opening 2. At this time, since the refill 9 and the rotor 7 are connected to each other, they protrude and sink while rotating with the rotor 7. At this time, since the end surface of the return spring 9 does not contact the shaft, the refill 9 can rotate smoothly. Further, secondary processing such as tumbling for cleaning the end face of the return spring is not required, and a certain shape performance can be easily obtained.

As the material of the sliding member, it is preferable to use a resin having a low coefficient of friction, such as nylon or polyacetal mixed with a lubricant, and a sintered metal impregnated with a lubricant may be used. Further, a projection or the like may be provided to reduce the contact area between the sliding member and the barrel, and between the sliding member and the refill.

[0018]

As described above, the present invention is as described above. The rotor rotates every time a knock occurs, and the refill rotates reliably in accordance with the rotation. However, the rotor rotates by a certain angle, and as a result, writing is performed at the same location of the pen tip portion. However, since it is not one location but several locations, uneven wear as described above is unlikely to occur. Therefore, in the case of a ball-point pen, it is possible to prevent the occurrence of blurring or blurring of handwriting lines caused by ink leakage from the tip of the tip or uneven rotation of the ball. Also, in the case of a felt-tip pen, it is possible to prevent the problem that a stable drawing is not obtained because the pen tip is worn unevenly. Furthermore, according to the present invention, 0.1 to 0.7 mm
Oil-based ballpoint pens using medium- and high-viscosity inks whose main solvent is a non-drying or non-volatile solvent that uses a chip with a ball diameter of Even so, the effect was exhibited.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the entirety of a knocking ballpoint pen according to a first embodiment, showing a state in which a tip of a ballpoint pen is immersed from a tip end of a barrel.

FIG. 2 is a longitudinal sectional view of the knocking ballpoint pen according to the first embodiment, showing a state in which a tip of the ballpoint pen is projected from a tip end of a barrel.

FIG. 3 is a perspective view showing the development of components of the knock ballpoint pen according to the first embodiment.

FIG. 4 is a sectional view of a cam cylinder used in the first and second embodiments.

FIG. 5 is a sectional view taken along line AA in FIG.

FIG. 6 is a perspective view of a rotor used in the first and second embodiments.

FIG. 7 is a half sectional view of a rotor.

FIG. 8 is a half sectional view of a knock bar used in Examples 1 and 2.

FIG. 9 is an enlarged view of a cam portion of the knock bar as viewed from above.

FIG. 10 is a perspective view showing the appearance of a knock bar.

FIG. 11 is a longitudinal sectional view showing the entirety of a knocking ballpoint pen according to the second embodiment, and shows a state in which a ballpoint pen tip is immersed from a tip end opening of a barrel.

FIG. 12 is a longitudinal sectional view showing the entirety of a knocking ballpoint pen according to the second embodiment, and shows a state in which a ballpoint pen tip is projected from a tip end of a barrel.

FIG. 13 is a perspective view showing an exploded view of parts of a knock ballpoint pen showing the second embodiment.

FIG. 14 is a perspective view showing an exploded view of parts of a conventional knock-type ballpoint pen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Tip opening 3 Cam cylinder 4 Clip 5 Crown 6 Knock rod 7 Rotor 8 Knock cover 9 Refill 10 Tube 11 Crimp 12 Tip 13 Return spring 14 Ink 15 Sliding member 16 Window 17 Inner hole 18 Cam portion 19 Rib Reference Signs List 20 cam groove 20a cam groove 20b cam groove 21 inclined surface 22 cam portion 23 rib 24 cam portion 25 rib 26 protrusion

Claims (2)

[Claims] 1. A refill that contains ink for a writing implement is slidably housed in a shaft cylinder by being urged rearward by a return spring, and is housed in a cam section constituted by the shaft cylinder itself or another component. A knock rod and a rotor having a cam portion and a rib that engage with the cam groove and a rotor are fitted so as to be able to move freely in the axial direction. Sandwich the sliding member,
A knock-type writing instrument such as a ball-point pen or a felt-tip pen, wherein the refill and the rotor are connected, and the refill rotates with the rotation of the rotor. 2. A refill containing ink for a writing implement is slidably received in a shaft cylinder by being urged rearward by a return spring, and reciprocates with a cam groove in a cam portion formed in the shaft cylinder. In a knock type writing instrument in which a knock bar having a cam portion and a rib and a rotor are fitted so as to be able to shift freely, a sliding member is sandwiched between the return spring and the refill, and the refill is A knock-type writing instrument such as a ball-point pen or a felt-tip pen, wherein the rotor is connected and the refill rotates with the rotation of the rotor.