JP2019130807A - Advancing-type pressure writing tool - Google Patents

Abstract

To provide an advancing-type pressure writing tool comprising a pressurizing mechanism which compresses and pressurizes a rear space of an ink storage cylinder in a linked manner with an operation for advancing a ballpoint pen refill in a shaft cylinder, in which the rear space of the ink storage cylinder may be easily released from a sealed state and resealed while keeping a writable state.SOLUTION: A slider 9 is accommodated in a shaft cylinder 4 in a state where it is engaged with the shaft cylinder 4 in a manner movable back and forth. The slider 9 comprises an operation part 9c having at least a part exposing from the shaft cylinder 4. When the operation part 9c is operated so that the slider 9 moves back or forth under a state where a front end part 14a of a ballpoint pen refill 7 projects from a front end opening 3a of the shaft cylinder 4, an air port 17c of a pressure mechanism 6 is brought into communication with outside and a rear space of an ink storage cylinder 11 is released from a sealed state to have the same pressure as outside. When the operation part operated so that the slider moves back or forth, the air port 17c of the pressure mechanism 6 is sealed to be a closed state. A pressure reset mechanism is provided for compressing and pressurizing the rear space of the ink storage cylinder 11 again.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure writing instrument that applies pressure to the rear end of an ink composition for a writing instrument in an ink containing cylinder.

 Conventionally, in this type of pressure writing instrument, as disclosed in, for example, Patent Document 1, the writing tip of the writing body is attached to the rear end portion of the writing body filled with ink by a pressing operation to the knocking body. There is known a knock-type pressure writing instrument that includes a knock-type protrusion / disconnection mechanism that protrudes and protrudes from a front end opening and a pressure mechanism that pressurizes a rear space portion of an ink storage cylinder of a writing body.

  In the pressure writing instrument having the knock type pressure mechanism as described above, the pressure mechanism is operated in conjunction with the pressing operation of the knock body to pressurize the rear space portion of the ink containing cylinder and The pressurization state in the ink storage cylinder is released in conjunction with the storing operation of the writing tip portion in the shaft cylinder by the mechanism. In addition, when the ink in the ink storage cylinder is consumed by writing in a pressurized state in which the writing tip is protruded from the opening of the shaft cylinder tip, the pressure inside the pressurized ink storage cylinder is gradually reduced. The effect of improving the handwriting density accompanying the increase in the ink discharge amount obtained by pressurization and preventing the air from being drawn from the writing tip when the writing tip is written upward will decrease. For this reason, in order to reset the decompressed state, the knock body is pressed and the writing tip is stored in the shaft cylinder to release the pressure state in the ink filling tube, and further, the knock body is pressed to store the ink. It was necessary to re-pressurize the inside, which was troublesome.

On the other hand, Patent Document 2 discloses a so-called pen pressure type ballpoint pen in which a pressurizing mechanism is operated by a writing pressure at the time of writing and the inside of an ink containing tube is brought into a pressurized state.
The pressure-pressure-type ballpoint pen described in Patent Document 2 is such that when the ballpoint pen tip (writing tip portion) is retracted by writing pressure during writing, the pressing mechanism operates to cause the trailing edge of the ink in the ink storage tube. Because of the structure in which pressure is applied, writing is performed while pressurizing each writing, and a stable handwriting can be obtained by maintaining a constant pressure in the ink storage tube at the time of writing.

JP 2000-335173 A JP 2000-263992 A

  However, in the structure of Patent Document 2, the pressure mechanism is operated by slightly retracting the writing tip by the writing pressure at the time of writing. For this reason, the writing feeling that the user feels during writing becomes soft because the writing tip moves backward. It is known that there are many people who prefer this soft writing feeling, but on the other hand, it is also known that there are people who feel uncomfortable that the writing tip retreats during writing. However, the pressure-pressure type ball-point pen that has been used has a problem that not everyone feels easy to write.

  The present invention relates to a feeding type pressure writing instrument having a pressurizing mechanism that compresses and pressurizes a rear space portion of an ink containing cylinder in conjunction with an operation of feeding a ballpoint pen refill in a shaft cylinder. An object of the present invention is to provide a pay-out type pressure writing instrument that can easily release and re-pressurize the sealed space of the rear space portion of the ink containing cylinder in a state of protruding from the front end opening.

The present invention
“1. A ball pen refill comprising an ink container filled with an ink composition for a writing instrument and a ballpoint pen tip in front of the ink container,
Behind the ink containing cylinder, there is provided a feeding mechanism that causes the front end of the ballpoint pen refill to protrude and retract from the front end opening of the shaft cylinder, and an air port that is connected to the rear part of the ink containing cylinder and communicates with the outside. A pressure mechanism,
The pressurizing mechanism shuts off the communication with the outside of the air port in conjunction with the forward feeding operation of the ballpoint pen refill and seals, compresses and pressurizes the rear space of the ink containing cylinder, In conjunction with the immersion operation of the ballpoint pen refill into the shaft cylinder, the air port communicates with the outside, and the sealed state of the rear space portion of the ink storage cylinder is released to be the same pressure as the external pressure. A pay-out type pressure writing instrument,
A sliding body is provided in the shaft cylinder so as to be able to move back and forth with respect to the shaft cylinder, and the sliding body includes an operation portion at least partially exposed from the shaft cylinder.
With the front end portion of the ballpoint pen refill projecting from the front end opening of the shaft cylinder, the air port of the pressurizing mechanism communicates with the outside by operating the operation portion and moving the sliding body forward or backward. Then, the sealed state of the rear space portion of the ink containing cylinder is released to be the same pressure as the external air pressure, and the sliding member is moved backward or forward by operating the operation portion, A feeding-type pressure writing instrument comprising: a pressure reset mechanism that shuts off and seals the air port, and compresses and pressurizes the rear space of the ink containing cylinder again.
2. 2. The feeding type pressure writing instrument according to claim 1, wherein an operation portion of the sliding body is disposed at a front portion of the shaft tube.
3. In the shaft tube, a first resilient member is disposed for projecting the sliding body forward or rearward along the axial direction,
After actuating the pressure reset mechanism and releasing the sealed state of the rear space portion of the ink containing cylinder, the sliding body is moved by the resilient force of the first resilient member, and the air of the pressure mechanism is moved. 3. The feeding type pressure writing instrument according to claim 1 or 2, wherein the mouth is closed and sealed, and the rear space portion of the ink containing cylinder is compressed and pressurized again.
4). The first elastic member is disposed between the shaft cylinder and the ballpoint pen refill, and the sliding body is elastically rearward with the ballpoint pen refill by the first elastic member,
The pressurizing mechanism includes a cylinder having the air port communicating inside and outside behind the ballpoint pen refill, a piston arranged to move back and forth with respect to the cylinder, and ink storage of the ballpoint refill inside the cylinder. A pressurizing space communicating between the rear space of the cylinder and the piston, and a second resilient member disposed between the cylinder and the piston and projecting the cylinder forward,
4. The feeding according to claim 3, wherein by operating the feeding mechanism, the piston moves forward to shut off and seal the air port, and the pressurizing space is compressed and pressurized. Type pressure writing instrument.
5). At least in the state where the front end portion of the ballpoint pen refill protrudes from the front end opening of the shaft cylinder, the elastic force of the first elastic member is greater than the elastic force of the second elastic member. 5. The feeding type pressure writing instrument according to the item 4, characterized in that it is configured as described above. It is.

According to the present invention, with the front end portion of the ballpoint pen refill projecting from the front end opening of the barrel, the operating portion is operated to move the sliding body forward or backward, so that the air port of the pressurizing mechanism is connected to the outside. Communicating to release the sealed state of the rear space portion of the ink storage cylinder to the same pressure as the external air pressure, and moving the sliding body rearward or forward, the air port of the pressurizing mechanism is shut off and the ink storage cylinder It is possible to compress and pressurize the rear space portion again. For this reason, when writing with the pay-out type pressure writing instrument of the present invention, the ink composition for the writing instrument in the ink storage cylinder is consumed by writing, and the volume of the rear space portion of the ink storage cylinder increases, so that the pressurizing mechanism Even if the applied pressure is reduced, the pressure can be easily released and repressurized by operating the pressure reset mechanism with the writing tip protruding from the front end opening of the barrel. Can be resumed.
When operating the pressure reset mechanism, the direction of moving the sliding body by operating the operating unit may be released by moving the operating unit forward, and may be repressurized by returning backward. The pressure may be released by moving the operation unit backward, and re-pressurized by returning it to the front.

  The ballpoint pen refill feeding mechanism of the present invention can be a conventionally known rear end knock type, rotary feed type, side knock type, as long as the pressurizing mechanism is operated in conjunction with the drawing of the ballpoint pen refill. Etc., without particular limitation.

  In addition, when gripping and writing the feeding type pressure writing instrument of the present invention, the gripping part is the front part of the shaft tube, so that the operation part of the sliding body is operated so that the pressure reset mechanism can be operated with the writing posture. In addition, it is preferable to be configured to be disposed at the front portion of the shaft tube. Further, if an operation unit is provided in addition to the grip portion of the shaft tube, a user's finger is caught on the grip portion at the time of writing, causing a malfunction. Therefore, it is more preferable that the position of the operation portion of the sliding body is formed at the front portion of the shaft cylinder and at the rear of the grip portion. Furthermore, as a means for preventing malfunction, the length of the operation portion in the axial circumferential direction may be shortened, and the length of the operation portion is easy to operate and the entire circumference of the shaft tube is difficult to touch when writing. Preferably, it is formed between 5% and 20%.

  In addition, the pressure reset mechanism is activated to release the sealed state of the rear space portion of the ink storage cylinder to the same pressure as the external pressure, and then the sliding body automatically moves so that the air port of the pressure mechanism In order to compress and pressurize the rear space of the ink containing cylinder again, the sliding body is repelled in the axial direction toward the front or rear (direction in which the pressurizing mechanism operates) in the axial direction. It is preferable to dispose the first elastic member. In this case, when the pressure is released by operating the operation unit, the first elastic member is automatically released by releasing the hand from the operation unit. The sliding body moves in the direction in which the pressurizing mechanism is operated, and can be repressurized. For this reason, the operability of the pressure reset mechanism is improved.

  Further, the pressurizing mechanism of the present invention is configured to advance the piston disposed in the shaft cylinder so that the pressurizing space portion in the cylinder is compressed and pressurized, and is behind the ballpoint pen refill communicating with the pressurizing space portion. The space portion may be configured to be pressurized. In this case, the cylinder is provided with an air port that communicates the inside and outside, so that when the pressurized space portion is released, the air port immediately The outside and the pressurizing space can be communicated. For this reason, it can prevent that the pressurization space part which generate | occur | produces instantaneously at the time of pressurization cancellation | release becomes a negative pressure state (state in which pressure becomes lower than external pressure), and also a pressurization space part becomes negative pressure. When the pressure is released, a small amount of air is sucked into the ballpoint refill from the front end of the ballpoint refill, and the ink discharge is inhibited at the start of the next writing, and the handwriting can be prevented from becoming thin.

  Also, at least in the writing state in which the front end portion of the ballpoint pen refill protrudes from the front end opening of the shaft cylinder, the resilience of the first resilient member is greater than the resilience of the second resilient member. Preferably, the ballpoint pen refill is ejected rearward by the first elastic member to prevent the cylinder of the pressurizing mechanism from moving forward by the elastic force of the second elastic member. The pressurization state of the pressurization space can be maintained.

  According to the present invention, in the pay-out-type pressure writing instrument provided with a pressurizing mechanism that compresses and pressurizes the rear space portion of the ink containing cylinder in conjunction with the operation of feeding out the ballpoint pen refill in the shaft cylinder, To provide a pay-out type pressure writing instrument that can be re-pressurized by easily releasing the sealed state of the rear space portion of the ink containing cylinder so as to be the same as the external pressure while protruding from the front end opening of the shaft cylinder. I was able to.

1 is a longitudinal sectional view of a pressure-type writing instrument according to Example 1. FIG. It is an AA line expanded sectional view in FIG. It is a perspective view for demonstrating a sliding body. It is an expanded sectional view of the pressurization mechanism in FIG. It is a longitudinal cross-sectional view which shows the knock state (writing state) which advanced the knock body from the state of FIG. It is a longitudinal cross-sectional view which shows the state which the sliding body moved ahead from the state of FIG.

Next, the pay-out-type pressure writing instrument of the present invention will be described in detail using a ballpoint pen with reference to the drawings, but the present invention is not limited to the following examples.
Further, in the present embodiment, in the longitudinal direction of the shaft tube, the one with the ball-point pen tip is expressed as the front, and the opposite side is expressed as the rear. Furthermore, in the axial diameter direction of the shaft cylinder, the direction where the ball pen refill is present is expressed as inward, and the opposite side is expressed as outward.
In addition, in order to make the explanation easy to understand, the same reference numerals are given to the same members and the same parts in the drawings.

Example 1
As shown in FIGS. 1 to 4, the pay-out-type pressure writing instrument 1 of this embodiment forms a shaft cylinder 4 by screwing the front shaft 3 in front of the rear shaft 2. The knock body 5 is arranged to be movable back and forth, the pressurizing mechanism 6 is disposed in the knock body 5, and the front of the pressurizing mechanism 6 is slidable back and forth within the shaft cylinder 4. A part of the ball-point pen refill 7, a clip 8 that is rotatably locked to the side surface of the rear shaft 3, and a part of the outer surface of the shaft tube 4 are exposed and locked to the shaft tube 4 so as to be movable back and forth. And a sliding body 9. Further, the feeding type pressure writing instrument 1 includes a feeding mechanism 10 that causes the front end portion of the ball pen refill 7 to protrude and retract from the front end opening 3 a of the front shaft 3 by moving the ball pen refill 7 back and forth with respect to the shaft cylinder 4. ing.

  The ball-point refill 7 is directly applied to a transparent ink containing cylinder 11 made of PP resin with an ink 12 as a writing instrument ink composition and a grease-like ink follower 13 that follows the rear end of the ink 12 as the ink is consumed. A ball (φ0.5 mm) is rotatably held in the front end opening of the ink containing cylinder 11 and is obtained by press-fitting the rear end of the ballpoint pen tip 14 serving as a writing tip. is there.

As shown in FIGS. 1 to 3, the sliding body 9 is formed as a substantially cylindrical body having a slit portion 9 a formed from the rear end toward the front. ), And the front inner hole 9b1 has a smaller diameter than the rear inner hole 9b2. In addition, a projecting operation portion 9 c that protrudes outward is formed on the outer surface of the sliding body 9.
In addition, the uneven part 9f is formed in the outer end of the operation part 9c, and it is made hard to slip | slip when operating with a finger.

  As shown in FIG. 1, the front shaft 3 (shaft cylinder 4) has a front end opening 3 a in which the ballpoint pen tip 14 of the ballpoint pen refill 7 can protrude and retract at the front end. Further, a side hole 3d that penetrates to the inner hole 3c and extends in the front-rear direction is formed in the outer surface 3b of the front shaft 3 (shaft cylinder 4), and an operation portion 9c of the sliding body 9 is arranged in the side hole 3d. The sliding body 9 is locked to the front shaft 3 so as to be movable back and forth.

Further, a first coil spring 15 (first elastic member) is stretched in a compressed state between an inner step portion 3e formed on the inner surface of the front shaft 3 (shaft cylinder 4) and a front end surface 9d of the sliding body 9. In addition, the outer step portion 7 a of the ballpoint pen refill 7 abuts on the inner step portion 9 e of the sliding member 9, so that the sliding member 9 and the ballpoint pen refill 7 are elastically moved backward with respect to the shaft cylinder 4. It has been issued.
Note that the outer surface of the front shaft 3 (shaft tube 4) is formed with a gripping portion 3f formed in a concavo-convex shape so that when the shaft tube 4 is gripped by hand, the finger is difficult to slip.

Further, the operation portion 9c of the sliding body 9 is disposed so as to be positioned behind the grip portion 3f of the front shaft 3. For this reason, it can prevent malfunctioning by a user's finger | hook getting on a holding part at the time of writing.
Further, the axial length L1 (see FIG. 2) of the operation portion 9c is not obstructed when the grip portion 3f is gripped and written, and the front shaft 3 (shaft cylinder 4 is easy to operate). ) Is preferably 5 to 20% of the entire circumference L2. In the present embodiment, specifically, the entire circumference L2 of the front shaft 3 (shaft cylinder 4) is 37.7 mm, and the length L1 in the axial direction of the operation portion 9c is 4.0 mm. For this reason, the length L1 in the axial direction of the operation portion 9c with respect to the entire circumferential length L2 of the front shaft 3 (shaft cylinder 4) is 10.6%, and it is difficult for a finger to hit the operation portion 9c during writing and writing is easy. It became.

  The rear shaft 2 (shaft cylinder 4) is formed in a cylindrical shape, and as shown in FIG. 1, a side hole 2b extending along the axial direction and penetrating to the inner hole is formed in the outer surface 2a. Further, the outer surface 2a is formed with a clip engaging portion 2c projecting outward, and the clip engaging portion 2c is constituted by a clip engaging projection 2d and a spring engaging projection 2e. The clip locking projection 2d is formed with a locking hole 2f in a direction orthogonal to the axial direction.

The knock body 5 is formed of a cylindrical body having a bottomed portion at the rear end, a latching protrusion 5a protruding outward is formed on the outer surface, and an inner step portion 5c is formed on the inner peripheral portion. And a stopper 5b protruding inward. The knock body 5 is disposed in the rear shaft 2 so that the rear end protrudes rearward from the rear end opening of the rear shaft 2.
The hooking protrusion 5a is inserted into the side hole 2b of the rear shaft 2, whereby the knock body 5 is locked with respect to the rear shaft 2 so as to be movable back and forth and non-rotatable.

The clip 8 is provided with a clip spring 16 between a spring locking protrusion 2e of the rear shaft 2 and an inner protrusion 8a formed on the inner wall portion of the clip 8 so as to protrude toward the shaft tube 4 side. By engaging the locking shaft portion 8b formed on the inner wall of the shaft 8 in the locking hole 2f, the tip end portion of the clip 8 is stretched so as to be constantly repelled on the outer wall surface side of the rear shaft 2, and the clip 8 By pressing the rear end portion (in the direction of arrow G in FIG. 5), the locking shaft R between the clip 8 and the rear shaft 2 is used as a fulcrum, and the front end portion of the clip 8 can be separated from the outer wall surface of the rear shaft 2. It is configured as a movable clip.
A clip 8d is formed at the front portion of the clip 8 so as to extend from the base 8c toward the shaft cylinder 4 and to be hooked with a latching protrusion 5a formed on the side surface of the knock body 5.

As shown in FIGS. 1 and 4, the pressurizing mechanism 6 is housed in the rear of the ballpoint pen refill 7 and inward of the knock body 5 so as to be movable back and forth with respect to the knock body 5. The piston 18 inserted into the rear end opening 17a of the cylinder 17 and slidably engaged with the cylinder 17 in the front-rear direction, the O-ring 19 fitted to the side surface of the piston 18, the cylinder 17 and the piston 18 A second coil spring 20 (second elastic member) stretched between them is used.
In addition, the pressurization mechanism 6 restrict | limits the movement to the front by the stopper 5b of the knock body 5. FIG.

The cylinder 17 will be described in detail. As shown in FIGS. 1 and 4, the cylinder 17 has an inner hole 17 b formed in a step shape penetrating forward and backward, and an inner hole 17 b is formed on the outer peripheral surface of the cylinder 17. An air port 17c penetrating up to is formed.
Further, a pressurizing space portion 21 surrounded by an inner portion 17d of the cylinder 17, a front end of the piston 18 and an O-ring 19 is formed in the inner hole 17b of the cylinder 17, and the pressurizing space portion 21 is formed by an air port 17c. The outside of the cylinder 17 is vented.

Further, the front portion 17e of the cylinder 17 is formed with a smaller diameter than the central portion 17f, and the front portion 17e is formed with two mounting portions 17g protruding in the circumferential direction outward along the axial direction. is there. Further, the rear end inner peripheral portion 7b of the ball pen refill 7 is detachably mounted on the mounting portion 17g of the cylinder 17, and the pressurizing space portion 21 is connected to the rear inner hole 7c of the ball pen refill 7 by the inner hole 17b of the cylinder 17 ( It communicates to the rear space.
The mounting portion 17g has an outward projecting amount so that when the ballpoint pen refill 7 is mounted on the cylinder 17, the airtightness between the cylinder 17 and the ballpoint pen refill 7 is ensured and it can be easily attached and detached by hand. (Outer diameter) is adjusted.

  The piston 18 will be described in detail. On the outer peripheral portion 18a of the piston 18, two convex portions 18b projecting outward are formed symmetrically across the axis. And the convex part 18b is latched to the window part 17h formed so that it may extend along the axial center in the center part 17f of the cylinder 17 so that sliding with respect to the front-back direction is possible.

Further, a concave concave portion 18c extending in the axial circumferential direction is formed on the outer peripheral portion 18a of the piston 18, and an O-ring 19 (sealing member) made of synthetic rubber is fitted into the concave portion 18c. The outer side of the O-ring 19 is in sliding contact with the inner side 17d of the cylinder 17, and the rear end opening 17a of the cylinder 17 is sealed so that air does not leak between the piston 18 and the O-ring 19. The rear end surface of the piston 18 is provided with a rear inner hole 18d formed in a concave shape toward the front.
When the cylinder 17 is retracted, the inner step portion 5c of the knock body 5 is brought into contact with the rear end of the cylinder 17, so that the cylinder 17 is prevented from retracting.

  The second coil spring 20 (second elastic member) will be described in detail. The second coil spring 20 is stretched between the inner step portion 17 i of the cylinder 17 and the front step portion 18 e of the piston 18. The cylinder 17 is bounced forward with respect to 18.

  The pressurizing space 21 is in a sealed state when the position of the O-ring 19 is in front of the air port 17c of the cylinder 17 due to sliding back and forth of the cylinder 17, and the position of the O-ring 19 is from the air port 17c. When in the rear, the pressurizing space 21 and the outside of the cylinder 17 communicate with each other through the air port 17c to be in an unsealed state.

Here, the relationship between the elastic forces of the first coil spring 15 and the second coil spring 20 will be described.
When not knocking (not writing) in FIG. 1, the elastic force of the first coil spring 15 is adjusted to be smaller than the elastic force of the second coil spring 20, and the knock body 5 is pressed forward. In the state of FIG. 5 (writing state), the elastic force of each coil spring is adjusted so that the elastic force of the first coil spring 15 is larger than the elastic force of the second coil spring 20.
Specifically, in this embodiment, the elastic force of the first coil spring 15 at the time of non-knocking (non-writing state) is 1.0 N, and the elastic force of the second coil spring 20 is about 1. It was configured to be 5N. Further, the elastic force of the first coil spring 15 at the time of knocking (writing state) is 2.4 N, and the elastic force of the second coil spring 20 is 1.7 N.

  In addition, the cylinder 17 in the writing state in which the front end portion 14a (writing tip portion) of the ball-point pen tip 14 protrudes from the front end opening portion 3a of the front shaft 3 by moving the sliding body 9 back and forth in the pay-out type pressure writing instrument 1. The pressurization reset mechanism which cancels | releases the sealing state of the pressurization space part 21 inside, and can repressurize is comprised.

Next, by using FIG. 1 and FIG. 5, the front end portion 14 a of the ballpoint pen tip 14 that is the writing tip of the ballpoint pen refill 7 is pushed into the front end portion 3 of the front shaft 3 by pressing the knock body 5 forward (knock operation). A state in which the non-writing state is switched to the writing state and pressure is applied to the rear end of the ink 12 in the ballpoint pen refill 7 via the ink follower 13 will be described.
When the knock body 5 is pushed forward from the state of FIG. 1 (in the direction of arrow F in FIG. 1), the piston 18 pushed by the knock body 5 moves forward. At this time, since the elastic force of the second coil spring 20 at the time of non-knock is set larger than the elastic force of the first coil spring 15, the second coil spring 20 is not compressed and is pressurized. The part 21 moves forward together with the cylinder 17 while the ball pen refill 7 is pressed forward together with the non-pressurized state. Then, the first coil spring 15 is compressed by being pushed by the ballpoint pen refill 7, and the elastic force of the first coil spring 15 becomes larger than the elastic force of the second coil spring 20, so that the forward movement of the cylinder 17 is stopped. . When the knock body 5 further moves forward and the inner step portion 5c of the knock body 5 abuts on the rear end of the cylinder 17, the cylinder 17 is pushed again by the knock body 5 together with the ballpoint pen refill 7 to move forward, and the front end of the front shaft 3 is moved forward. The front end portion 14a of the ballpoint pen tip 14 is projected from the opening 3a. Therefore, the hook protrusion 5a of the knock body 5 is hooked on the hooked portion 8d at the tip of the clip 8 disposed on the side surface of the rear shaft 2, so that the front end of the ballpoint pen tip 13 is moved to the front shaft 3 (shaft It will be in the state of FIG. 5 which maintains the state protruded from the front-end opening part 3a of the cylinder 4).

  At this time, in the pressurizing mechanism 6, when the advancement of the cylinder 17 stops, the piston 18 advances with respect to the cylinder 17 and the second coil spring 20 contracts, and the position of the O-ring 19 from the air port 17 c of the cylinder 17. Moves forward, and the pressure space 21 is sealed by the O-ring 19. When the piston 18 moves forward, the second coil spring 20 is further compressed, the rear inner hole 7c of the ball pen refill 7 and the pressure space 21 are compressed, and the ink 12 in the ball pen refill 7 has ink at the rear end thereof. The pressure is applied through the follower 13.

  Then, when the rear end portion of the clip 8 is pressed (in the direction of arrow G in FIG. 5) and the latching state of the latching protrusion 5a of the knock body 5 latched to the latched portion 8d of the clip 8 is released, the first Due to the elastic force of the coil spring 15, the ballpoint refill 7, the cylinder 17, the piston 18 and the knock body 5 are moved rearward so that the front end portion 14a of the ballpoint pen tip 14 is immersed in the front end opening 3a of the front shaft 3, Further, when the cylinder 17 is moved forward with respect to the piston 18 by the elastic force of the second coil spring 20 and the air port 17c reaches the O-ring 19, the pressurizing space portion 21 communicates with the outside through the air port 17c. The sealed state of the pressurizing space portion 21 is released, the pressure is the same as the external pressure, and the non-knock state (non-writing state) in FIG. 1 is restored.

Next, using FIG. 5 and FIG. 6, the sliding body 9 is slid back and forth along the axial direction, and the pressurization reset mechanism is operated to seal the pressurization space 21 in the pressurization mechanism 6. The operation of releasing the state to the same pressure as the external pressure and pressurizing again will be described.
When the finger is applied to the operating portion 9c of the sliding body 9 exposed from the outer surface of the front shaft 3 (shaft cylinder 4) and moved forward from the writing state of FIG. On the other hand, the piston 18 and the O-ring 19 move backward. Then, when the O-ring 19 reaches the air port 17c of the cylinder 17, the pressurizing space portion 21 communicates with the outside, the sealed state of the pressurizing space portion 21 is released, and becomes the same pressure as the external pressure in FIG. It becomes a state.
At this time, the three parts of the ballpoint pen refill 7, the cylinder 17, and the knock body 5 are moved to the front side by their own weight in accordance with the movement of the sliding body 9.

  Here, when the finger is released from the operation unit 9 c or the finger force pushing the operation unit 9 c forward is released from the state of FIG. 6, the sliding body 9 and the ballpoint pen refill are caused by the elastic force of the first coil spring 15. 7, the cylinder 17, the piston 18, the O-ring 19, and the knock body 5 move backward. Then, when the hooking protrusion 5a of the knock body 5 comes into contact with the hooked portion 8d of the clip 8, the knock body 5 stops retreating, and then the rear end of the piston 18 contacts the inner step portion 5c of the knock body 5. Retreating of the piston 18 and the O-ring 19 is stopped by contact. At this time, since the elastic force of the first coil spring 15 is set to be stronger than the elastic force of the second coil spring 20 at the time of knocking (writing state), the cylinder 17 and the ballpoint pen refill 7 continue to move backward. 5, the air port 17 c of the cylinder 17 moves rearward from the O-ring 19, the pressurizing space portion 21 enters a sealed state, and the pressurizing space portion 21 is compressed again by further moving the cylinder 17 rearward. Return to the state.

When the writing type pressure writing instrument 1 of the present embodiment performs writing in the writing state of FIG. 5 in which the front end portion 14 a of the ball tip chip 14 protrudes from the front end opening 3 a of the front shaft 3, the ink 12 in the ballpoint pen refill 7 is used. Since the pressure is applied to the rear end via the ink follower 13, the ink discharge amount is increased than usual, the handwriting density is improved, the handwriting is prevented from being blurred, and the writing at the time of upward writing, which is a specific problem of the ballpoint pen structure. The effect of preventing air entrainment from the tip can be obtained.
Further, if writing is continued in the state of FIG. 5, the ink 12 in the ballpoint refill 7 is consumed, so the volume of the rear inner hole 7 c (rear space portion) of the ballpoint refill 7 increases by the consumption of the ink 12. As a result, the pressure space portion 21 communicating with the rear inner hole 7c (rear space portion) is depressurized and the effect is reduced every time it is used. However, by operating the pressure reset mechanism, the pressure space The compressed state of the portion 21 can be released and repressurized, and the compressed state in the pressurized space portion 21 can be recovered.

Furthermore, since the pay-out-type pressure writing instrument 1 according to the present embodiment has the operation portion 9c of the sliding body 9 disposed immediately behind the grip portion 3f that grips the shaft cylinder 4 when writing, the writing-type press writing instrument 1 remains in a writing state. The operation unit 9c can be operated with a finger. For this reason, the operation of the pressure reset mechanism can be carried out without changing the shaft cylinder 4, and the writing can be continued while easily maintaining the pressure state of the pressure space portion 21.
Further, even if the operation of moving the operation portion 9c of the sliding body 9 and operating the pressure reset mechanism is repeated many times, the amount of pressurization in the pressurization space portion 21 continues to increase. In addition, the ink 12 does not leak from the front end portion 14a (writing tip portion) of the ballpoint pen tip 14 by excessively increasing the amount of pressurization. The pay-out type pressure writing instrument 1 has a structure that pressurizes the pressurizing space portion 21 simultaneously when the ball-point pen refill 7 is fed forward. Compared to the pressure-pressing type that pressurizes the inside of the refill, the writing tip of the ballpoint pen refill does not retreat during writing, making writing easier.

1 ... pay-out type pressure writing instrument,
2 ... rear axle, 2a ... outer surface, 2b ... side hole, 2c ... clip locking part,
2d: locking protrusion for clip, 2e: locking protrusion for spring, 2f: locking hole 3 ... front shaft, 3a ... front end opening, 3b ... outer surface, 3c ... inner hole, 3d ... side hole,
3e ... inner stage part, 3f ... gripping part,
4 ... shaft tube,
5 ... Knock body, 5a ... Stop projection, 5b ... Stopper, 5c ... Inner step,
6 ... Pressure mechanism,
7 ... Ballpoint pen refill, 7a ... Outer step, 7b ... Rear end inner periphery,
7c ... rear inner hole (rear space part),
8 ... Clip, 8a ... Inner protrusion, 8b ... Locking shaft, 8c ... Base, 8d ... Hooked part,
DESCRIPTION OF SYMBOLS 9 ... Sliding body, 9a ... Slit part, 9b ... Inner hole, 9b1 ... Front part inner hole, 9b2 ... Rear part inner hole,
9c ... operation part, 9d ... front end face, 9e ... inner step part, 9f ... uneven part,
10 ... Core feeding mechanism,
11 ... Ink container,
12 ... Ink (ink composition for writing instruments),
13 ... ink follower,
14 ... Ballpoint pen tip, 14a ... Front end,
15 ... 1st coil spring (1st elastic member),
16 ... Clip spring,
17 ... Cylinder, 17a ... Rear end opening, 17b ... Inner hole, 17c ... Air port,
17d ... inner side, 17e ... front part, 17f ... center part, 17g ... mounting part,
17h ... window, 17i ... inner step, 17j ... rear end of window,
18 ... piston, 18a ... outer peripheral part, 18b ... convex part, 18c ... concave part,
18d ... rear inner hole, 18e ... front step,
19 ... O-ring,
20: Second coil spring (second elastic member),
21: Pressurized space,
R: Locking shaft.

Claims (5)

A shaft pen refill containing an ink container filled with the ink composition for a writing instrument, and a ballpoint pen tip in front of the ink container,
Behind the ink containing cylinder, there is provided a feeding mechanism that causes the front end of the ballpoint pen refill to protrude and retract from the front end opening of the shaft cylinder, and an air port that is connected to the rear part of the ink containing cylinder and communicates with the outside. A pressure mechanism,
The pressurizing mechanism shuts off the communication with the outside of the air port in conjunction with the forward feeding operation of the ballpoint pen refill and seals, compresses and pressurizes the rear space of the ink containing cylinder, In conjunction with the immersion operation of the ballpoint pen refill into the shaft cylinder, the air port communicates with the outside, and the sealed state of the rear space portion of the ink storage cylinder is released to be the same pressure as the external pressure. A pay-out type pressure writing instrument,
A sliding body is provided in the shaft cylinder so as to be able to move back and forth with respect to the shaft cylinder, and the sliding body includes an operation portion at least partially exposed from the shaft cylinder.
With the front end portion of the ballpoint pen refill projecting from the front end opening of the shaft cylinder, the air port of the pressurizing mechanism communicates with the outside by operating the operation portion and moving the sliding body forward or backward. Then, the sealed state of the rear space portion of the ink containing cylinder is released to be the same pressure as the external air pressure, and the sliding member is moved backward or forward by operating the operation portion, A feeding-type pressure writing instrument comprising: a pressure reset mechanism that shuts off and seals the air port, and compresses and pressurizes the rear space of the ink containing cylinder again.   The feeding type pressure writing instrument according to claim 1, wherein an operation portion of the sliding body is disposed at a front portion of the shaft tube. In the shaft tube, a first resilient member is disposed for projecting the sliding body forward or rearward along the axial direction,
After actuating the pressure reset mechanism and releasing the sealed state of the rear space portion of the ink containing cylinder, the sliding body is moved by the resilient force of the first resilient member, and the air of the pressure mechanism is moved. The feeding type pressure writing instrument according to claim 1 or 2, wherein the mouth is closed and sealed, and the rear space portion of the ink containing cylinder is compressed and pressurized again. The first elastic member is disposed between the shaft cylinder and the ballpoint pen refill, and the sliding body is elastically rearward with the ballpoint pen refill by the first elastic member,
The pressurizing mechanism includes a cylinder having the air port communicating inside and outside behind the ballpoint pen refill, a piston arranged to move back and forth with respect to the cylinder, and ink storage of the ballpoint refill inside the cylinder. A pressurizing space communicating between the rear space of the cylinder and the piston, and a second resilient member disposed between the cylinder and the piston and projecting the cylinder forward,
4. The feeding according to claim 3, wherein by operating the feeding mechanism, the piston moves forward to block and seal the air port, and the pressurizing space is compressed and pressurized. Type pressure writing instrument.   At least in the state where the front end portion of the ballpoint pen refill protrudes from the front end opening of the shaft cylinder, the elastic force of the first elastic member is greater than the elastic force of the second elastic member. The feeding-type pressure writing instrument according to claim 4, which is configured as described above.

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