JP3960854B2 - Knock-type writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, a refill slidably disposed in a shaft tube is urged by a spring in the rear end direction of the shaft tube, and the pen tip portion of the refill tip is moved from the front end opening portion of the shaft tube by operating a knock body. The present invention relates to a knock-type writing instrument having a knock mechanism that can appear and disappear.
[0002]
[Prior art]
Conventionally, a refill containing ink for writing instruments is slidably arranged in the shaft tube by urging it toward the rear end of the shaft tube by a spring, and the knock body is operated, and the pen tip at the tip of the refill is pivoted. As a knock mechanism for a knock-type writing instrument that can be projected and retracted from the opening at the tip of the cylinder, a locking-type knock mechanism or rotation that locks the protrusion formed on the knock mechanism on the locking part of the shaft cylinder and releases it with a button. A rotating cam mechanism using the action of cam rotation is well known.
[0003]
In such a knock-type writing instrument, when the pen tip portion at the tip of the refill protrudes from the tip opening of the shaft tube, the knock body also moves in the direction of the shaft tube tip. Even if the knock-type writing instrument is accidentally attached to a pocket or the like with the pen tip at the tip of the refill protruding from the tip opening of the shaft tube, the pen tip is moved in the direction of the shaft tube tip. The state where the part protrudes can be visually confirmed.
[0004]
On the other hand, in the knock type writing instrument, an impact is generated when the pen tip portion at the tip of the refill is immersed from the state of protruding from the tip opening portion of the shaft tube. If the impact caused by this knocking operation is too strong, it adversely affects the refill, such as backflow of ink caused by swallowing air. Therefore, it is required to reduce the impact due to the knocking operation such as setting the knocking operation load low.
[0005]
[Problems to be solved by the invention]
However, if the knocking operation load is set low, the pen tip protrudes from the tip opening of the shaft tube while the hand or the like does not touch the knocking body, and the ink for writing instruments is particularly low-viscosity or low-viscosity ink. In the case of oil-based inks, there has been a problem in that pocket fabrics and the like are stained with ink. However, when a safety mechanism is provided, a safety mechanism is added to the conventional knock mechanism, and the structure is complicated.
[0006]
Further, for example, it is constituted by a knock body protruding outward from the rear end opening of the shaft tube, a cam portion provided at the tip of the knock body, a rotating cam, and a cam groove formed on the inner wall surface of the shaft tube. In a knock mechanism with a rotating cam, the cam groove and the protrusions that engage with the cam groove need to have a dimensional relationship that is strictly set. Depending on the dimensional relationship, the knock mechanism may not operate or the operation feeling may be poor. May occur.
[0007]
However, confirmation of the operation of the conventional knock mechanism could not be performed unless a pressing member such as a rotating cam that contacts the rear end of the refill is urged to the rear end. That is, the operation of the knock mechanism can be confirmed only after the refill for urging the pressing member to the rear end is provided.
[0008]
In view of the above problems, the present inventor can follow a conventional knock mechanism in a knock type writing instrument, and when attached to a pocket or the like, the tip of the pen tip is open at the tip of the shaft tube as long as the pen body is lightly touched. An object of the present invention is to provide a knock-type writing instrument that does not protrude more and has a small knock impact, and further provides a knock-type writing instrument that can confirm the operation of the knock mechanism without disposing a refill. is there.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention arranges a refill containing ink for writing instruments slidably biased toward the rear end of the shaft tube by a first coil spring disposed in the shaft tube. A knock mechanism that allows the pen tip at the tip of the refill to protrude and retract from the opening at the tip of the shaft tube by operating the knock body with a knock body that contacts the rear end of the refill or a refill pressing member that is linked to the knock body. A second coil that is a knock type writing instrument and urges the knock body or the refill pressing member in the direction of the rear end of the shaft cylinder between the knock body or the refill pressing member that contacts the rear end of the refill and the shaft cylinder. with disposing the spring, move the pen tip portion of the refill tip when projecting from the distal end opening of the barrel, the pen tip portion in the downward state, the pushing member is in Jikuto distal direction And those are.
[0010]
Furthermore, the refill pressing member is a rotating cam.
[0011]
Furthermore, the first coil spring is smaller than the spring force of the spring of the second coil spring.
[0012]
Furthermore, the operation load of the knock body is set to 500 to 800 g.
[0013]
Furthermore, the writing instrument ink is specified as an ink imparted with shear thinning viscosity.
[0014]
In the present invention, the knock mechanism capable of projecting and retracting the nib portion at the tip end of the refill from the tip opening portion of the shaft tube locks the protruding portion formed on the knock mechanism portion to the locking portion of the shaft tube and releases it with a button. It is a mechanism that allows the pen tip to protrude and retract from the opening of the tip of the shaft cylinder by operating the knock body, such as a locking type knock mechanism and a rotating cam mechanism that utilizes the rotating action of the rotating cam. Not what you want.
[0015]
The operating load of the knock body is a pressing load required to operate the knock body to maintain the protruding state of the pen tip, and bias the refill equipped with the pen tip toward the rear end of the shaft cylinder. The load that contracts the spring, the load that contracts the spring that urges the refill pressing member toward the rear end of the shaft cylinder, and the frictional force between the components generated in the knock mechanism during knock operation It is a load. Since the operation load greatly depends on the spring force of the spring, as a practical problem, the operation load may be set by selecting the spring force of the spring. The operation load is measured using a push-pull scale, and the maximum load required to maintain the pen tip protruding state is achieved by attaching a flat tip attachment to the end of the measurement shaft and pressing the knock body. And
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. The knock type writing instrument 1 according to the first embodiment shown in FIGS. 1 to 3 has a knock body (refill pressing member) 4 so as to protrude outward from the rear end opening 3 a of the rear shaft 3 on the rear shaft 3. Further, the buttons 5 are sequentially arranged so as to protrude from the rear shaft 3. Further, one end of the second coil spring 8 is brought into contact with the front end surface 4 b of the knock body 4, and the other end is brought into contact with a spring receiving member 6 connected to the rear shaft 3, so that the knock body 4 is brought into contact with the rear shaft 3. The rear end opening 3a is urged and stored. The outer diameter of the tip of the knock body 4 is larger than the outer diameter of the rear end portion of the refill 9, and the inner diameter of the second coil spring 8 is set larger than the outer diameter of the rear end portion of the refill 9. Is not in contact with the refill 9. A clip 12 is integrally provided on the rear shaft 3. Further, in this state, the knock mechanism H1 is configured by the second coil spring 8, the knock body 4, the locking portion 4a, and the locked portion 5a, so that the operation of the knock mechanism H1 can be confirmed.
[0017]
Further, a refill 9 having a pen tip portion 10 composed of a ballpoint pen tip that contains a shear-thinning ink (not shown) directly packed inside the front shaft 2 and rotatably holds a ball at the tip. Is urged toward the rear end of the front shaft 2 by the first coil spring 7 so as to be slidable. A grip member 11 is integrally provided on the front shaft 2. The front shaft 2 and the rear shaft 3 are screwed together to obtain the knock type writing instrument 1 of the first embodiment.
[0018]
By pressing the knock body 4, the refill 9 moves forward against the elastic force of the first coil spring 7, and the locking portion 4 a connected to the knock body 4 is locked to the locked portion 5 a. As shown in FIG. 2, the knock mechanism H acts, and the pen tip portion 10 protrudes from the tip opening 2 a of the front shaft 2, and writing can be performed while maintaining this state. Further, when the button 5 is pressed, the locking portion 4a that has been locked to the locked portion 5a is released, and the pen tip portion 10 is recessed from the tip opening 2a of the front shaft 2. The operation load of the knock body 4 necessary for maintaining the pen tip portion 10 was 600 g as a result of measurement with a push-pull scale.
[0019]
When the knock body 4 is pressed, it is necessary to compress the first coil spring 7 that biases the refill 9 backward and the second coil spring 8 that biases the knock body 4 toward the rear end. Therefore, the operation load that presses the knock body 4 is at least the sum of the first coil spring 7 and the second coil spring 8. However, since the refill 9 is biased only by the first coil spring 7 when the pen tip portion 10 is immersed from the state where the pen tip portion 10 protrudes from the tip opening portion 2a of the front shaft 2, the coil spring 7 Depends only on. As a result of removing the second coil spring 8 and measuring with the push-pull scale in the state of only the first coil spring 7, the operating load of the knock body 4 was 150 g.
[0020]
The knock type writing instrument 21 of the second embodiment shown in FIGS. 4 to 6 has a cam portion (not shown) at the tip so that the rear shaft 23 protrudes outward from the rear end opening 23a of the rear shaft. And a rotating cam (refill pressing member) 25 is sequentially arranged so that a protrusion 25a of the rotating cam 25 engages with a cam groove (not shown) formed in the rear shaft 23. Set up. Further, one end of the second coil spring 28 is brought into contact with the front end surface 25 b of the rotating cam 25, and the other end is brought into contact with a spring receiving member 26 connected to the rear shaft 23. The rear end opening 23a is urged and stored. Further, in this state, the knock mechanism H2 is configured by the second coil spring 28, the knock body 24, the cam portion (not shown), the cam groove (not shown), and the rotating cam 25, so that the operation of the knock mechanism H2 is confirmed. It can be performed.
[0021]
Further, a refill 9 having a pen tip portion 10 composed of a ballpoint pen tip that contains a shear-thinning ink (not shown) directly packed inside the front shaft 2 and rotatably holds a ball at the tip. Is urged toward the rear end of the front shaft 2 by the first coil spring 27 so as to be slidable. A grip member 11 is integrally provided on the front shaft 2. The front shaft 2 and the rear shaft 23 are screwed together to obtain the knock type writing instrument 21 of the second embodiment.
[0022]
When the knock body 24 is pressed, the knock mechanism H2 using the rotary cam 25 is activated, and the refill 9 moves forward against the elastic force of the first coil spring 27, as shown in FIG. The part 10 protrudes from the front end opening 2a of the front shaft 2, and writing can be performed while maintaining the state. Further, by pressing the knock body 24 again, the pen tip portion 10 is immersed from the tip opening 2 a of the front shaft 2. The operation load of the knock body 24 necessary for maintaining the pen tip portion 10 was 600 g as a result of measurement with a push-pull scale.
[0023]
When the knock body 24 is pressed, it is necessary to compress the first coil spring 27 that urges the refill 9 backward and the second coil spring 28 that urges the rotary cam 25 to the rear end. Therefore, the operation load that presses the knock body 24 is at least the sum of the first coil spring 27 and the second coil spring 28. However, the impact applied to the refill 9 when the pen tip 10 is retracted from the state in which it protrudes from the tip opening 2a of the front shaft 2 depends only on the coil spring 27 because the refill 9 is biased only by the coil spring 27. To do. As a result of removing the second coil spring 28 and measuring with the push-pull scale in the state of only the first coil spring 27, the operating load of the knock body 24 was 150 g.
[0024]
By the way, as described above, in the knock type writing instrument using the rotating cam, the cam groove and the protrusion engaged with the cam groove need to be strictly set in dimensional relation, and depending on the dimensional relation, the knock mechanism may not operate. The effects of the present invention are particularly remarkable because problems such as poor operating feel are likely to occur.
[0025]
In the conventional knock type writing instrument, the operation load of the knock body is generally set to 200 g or more and 300 g or less from the operability of the knock mechanism. As a result of examining the knocking operation load, if it is lower than 500 g, there is a risk that the pen tip will protrude when the hand or the like is lightly touched to the knocking body. If the load is higher than 800 g, the operability of the knocking body will be deteriorated. The impact when the tip is immersed in the shaft tube may adversely affect the refill, such as the backflow of ink due to the swallowing of air, so it is preferably set to 500 to 800 g. Further, it is preferable to set the operation load of only the first coil spring to be less than 200 g in order to reduce the impact caused by the knock operation.
[0026]
The ink for the writing instrument used in the present invention is not particularly limited, but it is called a so-called gel ink, which is statically high in viscosity and imparted with shear thinning that reduces the viscosity due to rotation of the ball during writing. Ink is stored directly in the refill without using a filling ink storage or the like as in the case of water-based ink. Therefore, when provided as a knock-type writing instrument, as described above, the nib portion protrudes from the tip opening of the shaft cylinder without knowing, and the ball of the nib portion rubs against the cloth of the pocket and rotates. As a result, the viscosity of the ink imparted with shear thinning at the pen tip portion is lowered, so that there is a remarkable penetration into the fabric, and the present invention is particularly effective.
[0027]
The knock mechanism used in the knock type writing instrument of the present invention is not particularly limited, but when a coil spring is disposed at the tip of the refill pressing member and the pen tip portion of the refill tip protrudes from the tip opening of the shaft tube. It is important that the knock body also moves in the axial direction.
[0028]
【The invention's effect】
Since the knock type writing instrument of the present invention is configured as described above, it can follow the conventional knock mechanism, and when it is attached to a pocket or the like, the pen tip part protrudes from the tip opening part of the shaft tube to the extent that it is lightly touched. In addition, the present invention has provided a knock type writing instrument that can check the operation of the knock mechanism without disposing a refill without providing a knock impact.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a knock-type writing instrument according to a first embodiment.
FIG. 2 is a longitudinal sectional view showing a state in which a pen tip portion protrudes in FIG. 1;
FIG. 3 is an enlarged cross-sectional view of a main part in FIG. 1;
FIG. 4 is a longitudinal sectional view showing a knock type writing instrument according to a second embodiment.
FIG. 5 is a longitudinal sectional view showing a state in which a pen tip portion protrudes in FIG. 4;
6 is an enlarged cross-sectional view of a main part in FIG. 4. FIG.
[Explanation of symbols]
1,21 Knock type writing instrument 2 Front shaft 2a Front end opening 3, 23 Rear shaft 4 Knock body 4a Locking portion 5 Button 5a Locked portion 6, 26 Spring receiving member 7, 27 First coil spring 8, 28 First 2 coil spring 9 refill 10 nib 11 grip member 24 knock body 25 rotating cam (refill pressing member)
H1, H2 knock mechanism

Claims (5)

After the refill, the refill containing the ink for writing instruments is slidably arranged by urging the rear end of the shaft cylinder by the first coil spring disposed in the shaft cylinder, and operating the knock body. A knock-type writing instrument provided with a knock mechanism capable of projecting and retracting a pen tip portion of a refill tip from a tip opening portion of a shaft tube by a knock body abutting on an end portion or a refill pressing member interlocking with the knock body, and after the refill A second coil spring is disposed between the knock body or the refill pressing member that abuts the end portion and the shaft cylinder to urge the knock body or the refill pressing member in the direction of the rear end of the shaft cylinder . the pen tip portion when projecting from the distal end opening of the barrel, with the pen tip portion facing downward, knock, characterized in that the pushing member is moved to Jikuto distal direction Shikihitsu Ingredients. The knock-type writing instrument according to claim 1, wherein the refill pressing member is a rotating cam. The knocking type writing instrument according to claim 1 or 2 , wherein the first coil spring has a smaller spring force than the spring of the second coil spring. The knock type writing instrument according to any one of claims 1 to 3, wherein an operation load of the knock body is set to 500 to 800 g. The knocking writing instrument according to any one of claims 1 to 3, wherein the writing instrument ink is an ink imparted with shear thinning viscosity.

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