JP2013216000A - Multi-lead writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a knock is formed in a cylindrical shape, two vertically long window holes are made to face each other, four vertical ribs are formed inside a knock cylinder, a locking part is formed in the middle of the vertical rib, and the knock is projectingly provided in the top surface of the knock cylinder to be projected from the tail end opening of a rear shaft, but in a multi-lead writing instrument in recent years, the thinning of a shaft is required and when thinning is performed by using the configuration thereof, the thickness of the knock cylinder and the vertical rib is made thin, and thereby, deflection caused by the reduction of the rigidity of the knock cylinder and the decrease of the reliability of the locking of a slider caused by the deflection are predicted.SOLUTION: In a multi-lead writing instrument, a plurality of refills are arranged to be extendable and retractable inside a shaft cylinder, and a tail valve is inserted and fitted to the rear end of the shaft cylinder. A plurality of beam-like partition walls are provided in a longitudinal direction inside the tail valve, and a slider attached to the rear end of the refill is slidably arranged between the partition walls adjacent to each other.

Description

  The present invention relates to a multi-core writing instrument in which a plurality of refills are arranged so as to be able to appear and retract inside a shaft tube, and a tail plug is inserted into a rear end portion of the shaft tube.

As an example, a ball-point pen core having a ball-point pen actuator connected to the tail end of the ink storage tube and a mechanical pencil center tool having a mechanical pencil actuator connected to the tail end of the core case are housed in the shaft tube. Pressing the pressing part of the ballpoint pen actuator or mechanical pencil operator protruding radially from the window hole of the shaft cylinder and moving it forward in the axial direction causes the ballpoint pen core or mechanical pencil to move forward and engage the actuator. A mechanical pencil and ballpoint pen that engages with the stopper and causes the tip of the pen body or mechanical pencil center tool to protrude from the opening at the tip of the shaft tube and to retract the other ballpoint pen core or mechanical pencil center tool in the forward position. In the multi-core writing instrument, a knock portion projects from the tail end, and a window hole through which the ball pen actuator and the mechanical pencil operator are inserted has a circumferential surface. A knock cylinder that is formed and has the locking portion inside is accommodated in the shaft cylinder so that it can move back and forth with the knock portion protruding from the tail end opening of the shaft cylinder. 2. Description of the Related Art There are known multi-pencil writing instruments such as a mechanical pencil and a ballpoint pen that a pencil lead extends when a knocking operation is performed by pressing the knocking portion when protruding from a front end opening of a shaft cylinder in a state where it cannot advance.
Japanese Utility Model Publication No. 5-93885.

In the above prior art, the knock portion is formed in a cylindrical shape, and two vertically long window holes are formed facing each other. Four vertical ribs are formed inside the knock cylinder, and a locking portion is formed in the middle of the vertical rib. A knock portion projects from the top surface of the knock cylinder and projects from the tail end opening of the rear shaft.
By the way, recent multi-core writing instruments are required to be thinned in the shaft tube, and when the thinning is carried out using the above-described configuration, the thickness of the knock tube and the vertical rib are thinned. As a result, the rigidity of the knock cylinder is reduced, and it becomes easy to bend. And, since the knock is bent, the reliability of the sliding of the knock itself and the locking of the slider locked in the knock has been lowered.

  Therefore, the present invention is a multi-core writing instrument in which a plurality of refills are arranged so as to be capable of appearing and retracting inside a shaft tube, and a tail plug is inserted into the rear end portion of the shaft tube, and the inside of the tail plug The gist is that a plurality of beam-shaped partition walls are provided in the longitudinal direction, and a slider attached to the rear end of the refill is slidably disposed between the adjacent partition walls.

  The present invention is a multi-core writing instrument in which a plurality of refills are arranged so as to be capable of appearing and retracting inside a shaft cylinder, and a tail plug is inserted into a rear end portion of the shaft cylinder, and a plurality of refills are provided inside the tail plug. A beam-shaped partition wall is provided in the longitudinal direction, and a slider attached to the rear end of the refill is slidably disposed between the adjacent partition walls. Therefore, it is possible to prevent the locking failure of the slider with respect to the tail plug as much as possible.

The operation will be described. As a refill, it is a multi-core writing instrument in which a ballpoint pen and a mechanical pencil unit consisting of three colors of black, red and blue are slidably arranged. Although this example is a multi-core writing instrument combined with a mechanical pencil unit, this part configuration can be used even with a writing instrument whose writing body is composed only of a ballpoint pen, and the parts can be shared. However, in the case of only the ballpoint pen body, there is no need for the sliding case to slide, and it is desirable to fix it. In this embodiment, by changing the assembling method, the tail plug can be fixed to the shaft cylinder as a head crown, or can be slidably assembled as a sliding case, and parts can be shared. ing. For this reason, it is possible to reduce the investment amount for mold production and to share the design. Even in the multi-core writing instrument composed only of the ballpoint pen, when an external force in the axial direction is applied during the sliding operation of the slider, the beam-shaped partition wall improves the shaft rigidity, so that the bending The effect of being difficult is obtained.

Next, an example will be described with reference to FIGS. In this example, engagement protrusions 1 a for engagement with the rear shaft 2 are provided at equal intervals on the outer peripheral surface of the sliding case 1. In this example, the engaging protrusion 1a is engaged with the rear end portion of the window hole 2a provided on the outer peripheral surface of the rear shaft 2, but the engaging protrusion of the sliding case 1 is formed above the window hole 2a. You may provide the exclusive engagement hole 24 which 1a engages. In this engaged state, the front half 1b of the sliding case 1 is disposed inside the rear end of the rear shaft 2, while the rear half of the sliding case 1 projects from the rear end opening 2b of the rear shaft 2. The protruding rear half portion of the sliding case 1 is a knock portion 1c, and the entire sliding case 1 slides back and forth with respect to the rear shaft 2 by the knock operation.
The inside of the sliding case 1 extends over the entire length and is partitioned by a beam-shaped partition wall 3 so as to divide the radial direction. The sliding case 1 has a bottomed cylindrical shape, but the cylindrical portion 1d disappears from the intermediate portion, and is open in the radial direction. Specifically, a cutout portion 1e having a fan-shaped cross section is formed, and the cutout portion 1e is in an open state. That is, the notch is used as a sliding surface, and the slider 4 slides in the sliding case 1. The pressing portion 4 a of the slider 4 protrudes outward from the window hole 2 a of the rear shaft 2, and the pressing portion 4 a of the slider 4 slides on the window hole 2 a of the rear shaft 2.
When the pen nib 5 is immersed, the slider 4 is pushed backward by the elastic force of the elastic member 6, and the rear end of the pressing portion 4a of the slider 4 is in contact with the slider contact portion 1f of the sliding case 1. It is in contact. In this state, when the user advances the slider 4, the slider 4 falls in the axial direction, and the engagement protrusion 4 b of the slider 4 is provided at the center of the beam-shaped partition wall 2 in the sliding case 1. Locked to the stop recess 7. At this moment, the pen tip 5 protrudes from the tip protrusion hole 8a of the front shaft 8, and writing becomes possible.
When the slider 4 of the sharp unit 9 is moved forward, the tip portion 9a of the sharp unit 9 is in a protruding state, and is substantially in contact with the inner surface portion 8b at the tip of the front shaft 8. The knock unit 1c is pressed by the contact of the front end 8 of the front shaft 8 of the sharp unit 9a of the sharp unit 8b and the sliding case 1 is pushed in, whereby the chuck 9b of the sharp unit 9 is opened, and the sharp core 10 Is drawn out and written.
Even when the pen tip 5 of the ballpoint pen is moved in and out or when the sharp core 10 is extended, the beam-shaped partition wall 3 provided in the sliding case 1 improves the rigidity, so that an external force is applied. The bending in the radial direction is prevented as much as possible. Therefore, a malfunction such as a sliding failure or a locking failure of the slider 4 or a centering failure of the sharp unit 9 is difficult to occur. Further, since each slider 4 is partitioned by the beam-shaped partition wall 3, contact other than the collision between the sliders 4 required at the time of release is prevented, and the feeding failure of the refill 11 due to the interference between the sliders 4 or the like. The malfunction is suppressed.

The beam-shaped partition wall 3 of the sliding case 1 is a symmetrical plane, and vertical ribs 3 a are provided on both sides of the beam-shaped partition wall 3. The slider 4 is slidably positioned between the opposing vertical ribs 3a. That is, the vertical rib 3a prevents the slider 4 from swinging in the lateral direction when the pen tip 5 is immersed. In addition, an inclined surface 3b is formed at the tip of the vertical rib 3a in a tapered shape that narrows toward the tip. When the sliding case 1 is attached to the rear shaft 2, a slider is inserted between the adjacent vertical ribs 3a to serve as a guide, thereby improving the assemblability. Further, even when the slider 4 is released from the locked state in the locking recess 7 in the sliding case 1, the slider 4 is guided by the tapered inclined surface 3b of the vertical rib 3a, so that the slider 4 is surely fixed in place. Return.
In this example, the vertical rib 3 a is not provided in a section of about one third from the tip of the sliding case 1. This is because some clearance of the released slider 4 is taken into consideration when the locked slider 4 is released. That is, it is better that there is no play until immediately before the release, but it is desirable that the resistance in the sliding case 1 is small immediately after the release and the position returns smoothly to the rear position. For this reason, the vertical rib 3a is not provided in a section of about one third from the tip, and the resistance immediately after the release is reduced.
Further, a protrusion 3 c is formed to extend from the front end portion of the sliding case 1. The protrusion 3 c prevents the lateral blur of the slider 4 that is locked in the locking recess 7 in the sliding case 1. That is, when the slider 4 in the locked state is released, the horizontal movement due to the contact of the other slider 4 is prevented as much as possible to prevent the release failure as much as possible. Further, the protrusion 3c formed at the tip of the sliding case 1 also serves to prevent the slider 4 from dropping in the axial direction and to maintain an appropriate locking position.
Further, an insertion groove 12 is formed on the inner surface of the rear shaft 2 by a pair of positioning ribs. A beam-shaped partition wall 3 of the sliding case 1 is slidably fitted into the insertion groove 12 to prevent radial rotation, that is, relative rotation. Specifically, two positioning ribs 13 are provided on the inner peripheral surface of the rear shaft 2 with respect to one partition wall 3 at a distance substantially the same as the width of the partition wall 3, and the adjacent positioning ribs 13. The partition wall 3 slides back and forth through the space (insertion groove 12). That is, the number of the positioning ribs 13 in the rear shaft 2 is twice the number of the partition walls 3, and the number of the partition walls 3 is caused by the number of the refills 11. Therefore, the number of the positioning ribs 13 is also determined by the number of the refills 11. . That is, if there are two refills 11, the number of positioning ribs 13 is four, and if three, there are six.

In this example, a stopper step 14 having a fan-like shape centered on the beam-shaped partition wall 3 is provided at the rear end of the cutout portion 1e in the middle of the sliding case 1, and the stopper The step portion 14 is formed to extend toward the distal end. Further, four of the beam-shaped partition walls 3 are formed at equal intervals in the radial direction, and the stopper step 14 is formed at two of the beam-shaped partition walls 3 at an interval of 180 degrees. ing.

By setting the length of the positioning rib 13 in the rear shaft 2 with respect to the stopper step portion 14, a writing instrument in which the refill 11 is composed only of the ballpoint pen refill 15, and at least one is composed of the sharp unit 9. The parts can be shared with writing instruments. For example, when the refill 11 is composed of only the ballpoint pen 15, as shown in FIG. 11, the refill 11 is assembled so that the stopper step 14 and the long positioning rib 13b are aligned (see FIG. 11c). As a result, the stopper step portion 14 and the rear end surface of the long positioning rib 13b come into contact after assembly, so that no further knocking is possible, and the sliding case 1 is fixed as the tail plug 23.
When incorporating at least one sharp unit 9 instead of the ballpoint pen refill 15, the stopper step 14 of the sliding case 1 is assembled so as to fit the short positioning rib 13a. By assembling in this state, a clearance is generated between the stopper step 14 and the short positioning rib 13a, and the sliding case 1 can slide back and forth with respect to the rear shaft 2. The clearance is formed until the stopper step 14 contacts the rear end of the short positioning rib 13a, and the moving range is the sliding distance of the sliding case 1. The sliding distance is longer than the distance necessary for the chuck 9b of the sharp unit 9 to open and the sharp core 10 to be fed out. Further, the difference between the short positioning rib 13a and the long positioning rib 13b is substantially equal to the length of the stopper step portion 14, but the difference between the long positioning rib 13b and the short positioning rib 13a is the length of the stopper step portion 14. It may be a little longer. In short, it is sufficient that the sliding distance necessary for the feeding of the sharp core 10 can be slid before the rear end of the positioning rib 13 and the stopper step portion 14 abut.

Reference numeral 1 is a cylindrical shaft body 16, and the shaft body 16 includes a front shaft 8, a rear shaft 2, and a sliding case 1. A conical portion 8 c that gradually decreases in diameter toward the tip end is formed on the inner diameter portion of the front shaft 8. At the tip of the front shaft 8, a protruding hole 8 a is formed in which the writing portion of the ballpoint pen refill 15 and the tip portion 9 a of the sharp unit 9 appear and disappear.
Further, the front shaft 8 is made of an opaque material, while the rear shaft 2 is made of a colored translucent material. When the ball-point pen refill 15 is attached to and detached from the slider 4, that is, when the ball-point pen is exchanged, the visibility of the attaching / detaching portion becomes good, and the attaching / detaching operation can be easily performed. Further, since the rear shaft 2 has a cylindrical shape, the attaching / detaching portion is enlarged and enlarged by the lens action of the curved surface, so that the attaching / detaching operation can be performed more easily. A grip portion 17 made of a rubber-like elastic body is inserted into the front shaft 8, but the rubber-like elastic body is integrally formed with the front shaft 8 by means such as two-color molding or multicolor molding. The grip portion 17 may be covered.

  The rear shaft 2 is formed with four window holes 2a in the longitudinal direction. In this example, four window holes 2a are formed, but the total number of the ballpoint pen refills 15 and the sharp units 9 which are the refills 11 is four. Depending on the number of the refills 11, the window holes 2a are formed. The number formed by this also varies. A sliding case 1 is provided in the rear shaft 2 so that the rear end of the rear shaft 2 is slidable. The sliding case 1 is divided in the radial direction by the number of refills 11. The section is partitioned by a beam-shaped section wall 3 that spreads radially around the axis. The slider 4 attached to the rear end of the refill 11 slides back and forth in the section 18 so that the pen tip 5 of the ballpoint pen refill 15 and the tip portion 9a of the sharp unit 9 are immersed. Although the number of the compartments 18 is four in this example, it varies depending on the number of the refills 11.

A slider 4 made of an opaque material is slidably disposed in the window hole 2 a of the rear shaft 2. On both sides of the slider 4 in the longitudinal direction, drop prevention protrusions 4c are formed to prevent the slider 4 from falling off from the window hole 2a of the rear shaft 2.
On the back surface of the slider 4, one locking projection 4b and two release projections 4d and 4e are formed at an interval. The locking projection 4b is locked to a locking recess 7 provided in the center of the beam-shaped partition wall 3 that partitions the sliding case 1, and the pen tip 5 of the ballpoint pen refill 15 or the tip of the sharp unit 9 is used. The protruding state of the part 9a is maintained. When the other slider 4 positioned at the rear is advanced in the protruding state of the tip 5 of the ballpoint pen refill or the tip 9a of the sharp unit 9, the forward release protrusion 4d of the advanced slider 4 is locked. The slider 4 comes into contact with the rear release protrusion 4e of the slider 4 and is released when the slider 4 is moved radially outward. At that moment, the slider 4 is released by the elastic force of the elastic member 6. Moving backward, the pen tip 5 of the ballpoint pen refill 15 and the tip portion 9a of the sharp unit 9 are in a sunk state.

Further, a plate-like protrusion 4 f is formed at the front end of the slider 4 in the longitudinal direction. A substantially disc-shaped bulging portion 4g is formed at the tip of the protrusion 19. By forming the protrusions 4f and the bulging portions 4g in a plate shape and a disk shape, an air circulation furnace is formed when a writing body to be described later is connected. That is, when the refill 11 is changed to the ballpoint penfill 15 as in this example, air is surely intruded into the cursive body (ballpoint pen) due to ink consumption.
The rear portion of the ink containing cylinder 15a of the ballpoint pen refill 15 is connected to the protrusion 4f (bulged portion 4g) of the slider 4. Here, the slider 4 is formed of an opaque material colored in the same color as the ink color used for the ballpoint pen refill 15, but is formed of a transparent or colored translucent material. Also good. A sense of depth of the slider 4 is generated, and the aesthetic appearance is further improved. Similarly, a slider 4 is also inserted behind the sharp unit 9 and is configured to be colored and distinguished from a color different from that of the ballpoint pen slider. It doesn't matter.
In this example, the ink containing cylinder 15a of the ballpoint pen refill 15 is made of a transparent or colored translucent material, but at least a connection portion of the ink containing cylinder 15a with the slider 4 is transparent, or It is sufficient if it is made of a colored translucent material. When the refill 11 is replaced, the connection state between the refill 11 and the slider 4 (bulged portion 4g) can be easily confirmed.

In addition, the front end portion of the slider 4 is formed with a flange portion 4h with which a rear end portion of an elastic member 6 described later comes into contact.
Reference numeral 6 denotes an elastic member 6 such as a coil spring that biases the refill 11 and the slider 4 connected to the refill 11 backward. Note that three refills 11 in this example are the ballpoint pen refills 15 as described above, and the other is the sharp unit 9. The ink containing cylinder 15 a of the ballpoint pen refill 15 and the core tank 9 c of the sharp unit 9 are connected to the bulging portion 4 g of the slider 4. Specifically, a ballpoint pen refill 15 storing black, red, and blue inks and a sharp unit 9 are connected.

  A restricting portion 19 is formed at an intermediate portion of the rear shaft 2, and four through holes 20 into which the refill is loosely inserted are formed in the restricting portion 19. By locking one end of 6, the refill 11 is urged backward.

In this example, the rear shaft 2 is configured by one component, but the rear shaft 2 may be divided and configured. This configuration can be obtained by forming the middle shaft 21 having the restricting portion 19 having the through hole 20 and the rear shaft 2 having the window hole 2a through which the slider 4 slides, and fitting the two members. By comprising two members, the decorative surface such as transfer printing of the middle shaft 21 and the resin color of the middle shaft 21 and the rear shaft 2 can be improved. The slider 4, refill 11, and elastic member 6 can be incorporated from the division position of the rear shaft 2 and the middle shaft 21, and the productivity is further improved.
Moreover, as a structure of the shaft main body 16 that produces the effect of the present invention, a structure in which the restricting portion 19 is formed of a separate member and is fitted at the time of assembling can be mentioned. By configuring the regulating portion as the core 22 of another member and fitting it, it is a part that does not appear in the appearance, so it can be composed of a material that emphasizes slidability, such as POM (polyacetal resin), The effect that resistance with the refill 11 decreases is produced.
Furthermore, when this configuration is used, the partition 18 formed by the beam-shaped partition wall 3 is configured in the rear shaft 2 and only the locking recess 7 of the slider 4 may be provided in the sliding case 1 (see FIG. 20). As a result, the rear end portion can be thinned, and a multi-core writing instrument with excellent aesthetics can be provided. In this example, since the beam-shaped partition wall 3 and the central locking recess 7 are not integral parts, each part itself is less rigid than the first embodiment. After assembly, the rigidity is sufficient.

  In this example, the refill 11 is exemplified by four multi-core writing instruments. However, if the refill 11 includes two or more refills 11, the effect of the present configuration is exhibited. That is, if there are three refills 11, there are three beam-shaped partition walls 3, and if there are five refills, there are five beam-shaped partition walls 3. As a reference example, an embodiment with five refills 11 is shown in FIG. As shown in FIG. 21, the increase in the number of the beam-like partition walls 3 makes it more robust against radial deflection. That is, as the number of the refills 11 increases, the diameter becomes larger and the wall becomes thinner and the strength is reduced. On the other hand, when the refills 11 are increased, the number of the beam-shaped partition walls 3 is increased. The main body 16 can be reinforced.

  In this example, the shape of the beam-shaped partition wall 3 is provided radially with a substantially uniform thickness centered on the axis, but in order to prevent the sliding case 1 from being bent, the beam-shaped partition wall 3 is as much as possible. It is desirable that the wall 3 is thick, and it is possible to further improve the strength by making the cross section of the beam-shaped partition wall have a fan shape.

1 is an external view showing an example of the present invention. The longitudinal cross-sectional view of FIG. The front view of a sliding case. FIG. 4 is a bottom view of FIG. 3. The longitudinal cross-sectional view of FIG. The front view of a slider. Side view of FIG. The front view of a rear axis. The longitudinal cross-sectional view of FIG. FIG. 9 is a top view of FIG. 8. (A) The longitudinal cross-sectional view of the axial main body comprised only with the ball-point pen refill. (B) The figure which removed the sliding component of Fig.11 (a). (C) The B section enlarged view of FIG.11 (b). FIG. 3 is a detailed view of part A in FIG. 2. The front view of the axis | shaft main body which comprised the rear axis | shaft with two components. The rear-axis side view which used the control part as another member. FIG. 13 is a longitudinal sectional view FIG. 14 is a bottom view of FIG. 13. FIG. 1 is a longitudinal sectional view 1 of a shaft main body operating part with a restricting part as another member. The longitudinal cross-sectional view 2 of the axial main body action | operation part which used the control part as another member. FIG. 18 is a cross-sectional view of FIG. The knock figure of FIG. The bottom view of the rear shaft when there are five refills.

DESCRIPTION OF SYMBOLS 1 Sliding case 1a Engagement protrusion 1b Front half part 1c Knock part 1d Tube part 1e Notch part 1f Slider contact part 2 Rear shaft 2a Window hole 2b Rear end opening part 3 Partition wall 3a Vertical rib 3b Inclined surface 3c Projection 4 Slider 4a Slider pressing portion 4b Locking projection 4c Removal prevention projection 4d Front release projection 4e Backward release projection 4f Projection portion 4g Swelling portion 4h Hook portion 5 Pen tip 6 Repellent member 7 Locking recess portion 8 Front shaft 8a Projection hole 8b Inner surface portion 8c Conical portion 9 Sharp unit 9a Tip portion 9b Chuck 9c Core tank 10 Sharp core 11 Refill 12 Inserting groove 13 Positioning rib 13a Short positioning rib 13b Long positioning rib 14 Stopper step 15 Ball pen refill 15a Ink receiving cylinder 16 Shaft body 17 Grip part 18 Section 19 Restriction part 20 Through-hole 21 Center shaft 22 Core 23 Tail plug

Claims (3)

A multi-core writing instrument in which a plurality of refills are arranged so as to be capable of appearing and retracting inside a shaft tube, and a tail plug is inserted into a rear end portion of the shaft tube, and a plurality of beam-shaped sections are arranged inside the tail plug. A multi-core writing instrument in which a partition is provided in the longitudinal direction, and a slider attached to the rear end of the refill is slidably disposed between the adjacent partition walls. The multi-core writing instrument according to claim 1, wherein a concave portion for locking the slider is formed at a central portion of the beam-shaped partition wall. The multi-core writing instrument according to claim 1, wherein at least one of the refills is a mechanical pencil unit, and the tail plug is slidably disposed with respect to the shaft tube.

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