JP2012158097A - Duplex writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that in the conventional duplex writing utensils including at least one piece of mechanical pencil unit, a user feels sense of discomfort at hand and sliding operation is poor since a large diameter part (step part) of a coupling of a mechanical pencil unit advances or retreats while being rubbed with a coupling of a core holder of a ball-point pen refill and a spring in such a process that the mechanical pencil unit is projected.SOLUTION: A front step part formed with the large diameter part and a small diameter part positioned on the front side of the large diameter part are formed on a coupling member of the mechanical pencil unit, other writing bodies other than the mechanical pencil unit have a writing part disposed on the tip and a pipe part connected with the piping part, meanwhile, a step part is formed on a connection part between the writing part and the pipe part and, while the mechanical pencil unit attains to an immersive state from a projected state, the front side step part is always positioned on the rear side from the step side formed on the other writing bodies.

Description

  The present invention relates to a compound writing instrument in which a plurality of writing bodies including at least a mechanical pencil unit are arranged in a shaft main body so as to be movable back and forth.

As an example, a mechanical pencil unit is provided in front of a slider guided in the axial direction in each of slits (longitudinal slit portions) having a front shaft detachably fixed to the front of the middle shaft and drilled at a plurality of positions on a side surface of the middle shaft. Or there is a double writing instrument with a ballpoint refill fixed.
More specifically, the mechanical pencil unit has a core pipe and a mechanical pencil writing body, the core pipe is fixed in front of the slider, and the mechanical pencil writing body is attached in front of the core pipe. The ballpoint pen refill has a receiving pipe, a lead holder, and a ballpoint pen writing body. The receiving pipe is fixed to the front of the slider, and the lead holder is attached to the front of the receiving pipe. The tip of the ballpoint pen is held in a protruding state. Each slider is provided so that it can be moved back and forth by urging a return spring between the front of the slider and the front end of the middle shaft, and the tip of each cursive body is selectively selected from the projection hole (tip end) of the front shaft. It is possible to appear and disappear.
Here, the mechanical pencil unit connects the core pipe and the mechanical pencil cursive with a joint, but this joint has a large diameter part and a small diameter part formed in front of the large diameter part, A chuck spring is stretched around the small diameter portion. For this reason, a step portion is formed at the front end of the large-diameter portion of the joint. Further, the core holder of the ballpoint pen refill has a tip that surrounds the gripping portion of the chuck and receives the front end of the spring, and a step portion is formed on the outer periphery of the tip. The stepped portion comes into contact with the inner stepped portion of the front shaft, so that the ballpoint pen can be grasped and released by the chuck.

    JP 2006-142522 A.

However, in the above prior art, in the protruding state of the mechanical pencil unit, the joint of the mechanical pencil unit joined to the front of the core pipe is in front of the joint that is a part of the core holder of the ballpoint pen refill and the spring. There was a problem of being positioned (see FIG. 1 of Patent Document 1). In such a compound writing instrument, since a plurality of writing bodies are arranged, all the writing bodies are arranged so as to be shifted from the central axis of the opening. Further, the mechanical pencil unit (mechanical pencil cursive, core holder) is a one-point support in which only the rear end is fixed to the slider, and is in a so-called cantilever state. Under such a configuration, when the writing instrument is gripped and each writing body is projected, the writing instrument itself is often tilted from the vertical direction to perform the projecting operation. Therefore, when the mechanical pencil curls appear and disappear from the tip opening at the center of the tip axis, they will bend and appear in the direction in which the writing instrument itself is tilted while being inclined in the tip axis (the same applies to other lead holders). . In other words, as the mechanical pencil unit protrudes or immerses, the step of the joint of the mechanical pencil unit moves forward or backward while rubbing against the joint of the core holder of the ballpoint pen refill and the spring. The operation is bad. In particular, in the case of a design in which the tip shaft is thin and slim, a slide feeling is further deteriorated.
Also, when performing the lead feeding operation in the protruding state of the mechanical pencil unit, the joint of the mechanical pencil unit rubs against the step provided on the outer periphery of the tip of the lead holder of the ball pen refill every time the lead feeding operation is performed. Therefore, there was a sense of incongruity in the hand and the slide operation was bad.

  Therefore, the present invention relates to a lead tank that houses a lead, a chuck body that grips and releases the lead attached to the front of the lead tank via a joint member, surrounds the front of the chuck body, and chucks the chuck body A plurality of writing bodies including at least a mechanical pencil unit having a chuck ring that opens and closes the body, an elastic member that urges the chuck body and the core tank toward the rear, and a tip member that internally includes a core detent member. It is a dual-type writing instrument arranged so as to be able to appear and retract in the shaft body, and the joint member of the mechanical pencil unit moves back and forth with respect to the tip member, and the joint member has a large diameter portion and a front portion of the large diameter portion. A front step formed by a small-diameter portion located is formed, and other writing bodies excluding the mechanical pencil unit include a writing portion provided at the tip, and the writing portion. While having a pipe portion that is formed in a diameter and connected to the writing portion, a step portion is formed at a connecting portion between the writing portion and the pipe portion, and while the mechanical pencil unit is in a immersive state from a protruding state. The gist is that the front step portion of the mechanical pencil unit is always located behind the step portion formed in the other writing body.

  The present invention relates to a lead tank that houses a lead, a chuck body that grips and releases the lead attached to the front of the lead tank via a joint member, surrounds the front of the chuck body, and The shaft body includes a plurality of writing bodies including at least a mechanical pencil unit having a chuck ring that opens and closes, an elastic member that urges the chuck body and the core tank toward the rear, and a tip member that internally includes a core detent member. A double-type writing instrument arranged so as to be capable of appearing and retracting inside, wherein the joint member of the mechanical pencil unit moves back and forth with respect to the tip member, and the joint member is positioned in front of the large-diameter portion and the large-diameter portion. A front step formed by a small-diameter portion is formed, and other writing bodies excluding the mechanical pencil unit are formed with a writing portion provided at the tip and a larger diameter than the writing portion. And having a pipe portion connected to the writing portion, a stepped portion is formed at the connecting portion between the writing portion and the pipe portion, and the mechanical pencil unit is always in a state of being immersed from the protruding state, Since the front step part of the mechanical pencil unit is located behind the step part formed on the other cursive body, when the mechanical pencil unit is projected and retracted from the shaft main body and the lead is extended, the mechanical pencil unit There is little rubbing between the unit and other cursives, and the mechanical pencil unit can be smoothly moved in and out and the lead can be extended.

The external appearance front view which shows this invention. The side view of FIG. The longitudinal cross-sectional view of FIG. Front enlarged view of FIG. The WW sectional view taken on the line of FIG. The V section expansion of FIG. The YY sectional view taken on the line of FIG. The single-piece | unit perspective view of the slider for ball-point pens. The exploded view of the essential parts of the ballpoint pen refill, connecting member and slider. The external appearance perspective view which shows the connection state in FIG. The front view of a slider. The external appearance perspective view of a connection member. The front view of a connection member. The side view of FIG. AA sectional view taken on the line AA in FIG. BB sectional drawing of FIG. The external appearance perspective view of the slider for a mechanical pencil unit. The longitudinal cross-sectional view of a mechanical pencil unit. The side view which shows the connection state of a mechanical pencil unit, a connection member, and a slider. FIG. 20 is a vertical cross-sectional view of a mechanical pencil unit slider and lead tank connecting portion in FIG. 19. The external appearance perspective view which shows the connection state of a mechanical pencil unit and a slider. Modified example of slider connection for mechanical pencil unit. The side external view which assembled | attached the slider of FIG. 22 to the mechanical pencil unit. (A) The external appearance perspective view which shows operation | movement (slider retreat position). (B) The external appearance perspective view which shows operation | movement (slider advance position). The longitudinal cross-sectional view of FIG.24 (b). The longitudinal cross-sectional view in the state where a mechanical pencil unit protrudes. FIG. 27 is a front longitudinal sectional view of FIG. 26. The front view of this writing instrument in the state of FIG.24 (b) (front direction). The CC direction cross-section arrow directional view of FIG. FIG. 27 shows the state when the lead is fully extended from the state shown in FIG. The longitudinal cross-sectional view of the mechanical pencil unit incorporating the modification of a joint member.

  The operation will be described. A core tank that houses the core, a chuck body that grips and opens the core attached to the front of the core tank via a joint member, and a chuck that surrounds the front of the chuck body and opens and closes the chuck body Multiple writing bodies including at least a mechanical pencil unit with a ring, a resilient member that urges the chuck body and core tank toward the rear, and a tip member that houses a core detent member can be projected and retracted in the shaft body. The joint member of the mechanical pencil unit moves back and forth with respect to the tip member, and the joint member is formed by a large diameter portion and a small diameter portion located in front of the large diameter portion. The other writing body excluding the mechanical pencil unit is formed with a writing part provided at the tip and a diameter larger than that of the writing part. The mechanical pencil unit has a pipe part connected to the writing part, and a step part is formed at the connection part between the writing part and the pipe part, and the mechanical pencil unit is always in a state where the mechanical pencil unit goes from a protruding state to an immersive state. Since the front step portion is positioned behind the step portion formed on the other cursive body, it has an adverse effect on the back and forth movement of the mechanical pencil unit when the mechanical pencil unit comes and goes, or when the lead is extended. There is little rubbing with other cursives.

This embodiment will be described with reference to FIGS. In the figure, the lower part is called the front and the upper part is called the rear. An example is a multi-core writing instrument (double writing instrument) in which a ballpoint pen refill composed of two colors, black and red, and a mechanical pencil unit are slidably arranged. In addition, as a writing body arrange | positioned in the axis | shaft main body (shaft cylinder) of a compound writing instrument, at least 1 should just be a mechanical pencil unit, the other writing bodies are not restricted to a ball-point pen refill. For example, a stylus pen or a stick-shaped eraser feed (refill) may be used.
Reference numeral 1 denotes a shaft main body, and the shaft main body 1 includes a front shaft 2 and a rear shaft 3. Further, in this example, the front shaft 2 is constituted by a screwed structure of the tip member 4 and the middle shaft 5, but may be press-fitted by uneven fitting or may be integrally formed. However, considering the ease of exchanging the cursive and the molding described later, it is better to use two members and fix them detachably. In addition, a conical portion 4a whose diameter gradually decreases toward the distal end side is formed in the inner diameter portion of the tip member 4. A protruding hole 4b in which the cursive body appears and disappears is formed at the tip of the tip member 4. In addition, since a plurality of flat portions 4c that are long in the longitudinal direction of the shaft body 1 are formed in the inner diameter portion of the tip member 4, when the shaft body 1 (the tip member 4) is transparent, the flat portion 4c. By the lens effect obtained by the above, it is possible to easily identify the colors of the mechanical pencil unit and the ballpoint pen refill disposed therein, and a high-quality feeling can be obtained (see FIGS. 1 to 4 and FIG. 27). In this embodiment, the shaft body 1 is made of a transparent or colored translucent material. However, the present invention is not limited to this, and the shaft body may be made of a colored and opaque material.

The rear shaft 3 is formed with three slits 6 in the longitudinal direction (see FIG. 5). In this example, three slits 6 are formed, because the number of ballpoint pen refills that are cursive letters is two and the number of mechanical pencil units is one, depending on the number of cursive letters. The number of slits formed also varies. Further, the slit 6 is formed up to one end portion of the rear shaft 3, and sliding grooves 7 are formed substantially in a straight line on both sides of the slit 6. The rear shaft 3 is formed with a slide surface 3a having substantially the same length as the slide groove 7 in the longitudinal direction. However, the sliding groove 7 and the sliding surface 3a are not formed over the entire length of both sides of the slit 6, but are formed only up to the middle portion. The slide surface 3a receives the back surface of a slide projection 12 described later. Further, a narrow slit portion 6a having a narrower width than the sliding groove 7 of the slit 6 is formed (see FIG. 6).
In front of the rear shaft 3, leg portions 8 having a semicircular shape with a cross-sectional shape having an arcuate portion on the outside are formed at intervals of 120 degrees. The leg portion 8 is formed by forming the slit 6. Therefore, the number of legs 8 varies depending on the number of cursive letters. The circumscribed circle diameter of the leg portion 8 is formed smaller than the maximum outer diameter of the rear shaft 3 (see FIG. 7).
Reference numeral 9 denotes a clip portion formed integrally with the rear shaft 3, but it may be formed of a separate member and fixed to the rear shaft 3. Reference numeral 10 denotes a ball portion formed on the front inner surface of the clip portion 9, and the ball portion 10 is in contact with the surface of the middle shaft 5.

A slider 11 made of a transparent or colored translucent material is slidably disposed in the slit 6 of the rear shaft 3. The slider 11 includes a slider 11B for ballpoint pen refill and a slider 11S for a mechanical pencil unit. Here, the slider 11B for ballpoint pen refill will be described in detail. Sliding projections 12 are formed on both sides of the slider 11B in the longitudinal direction, and are slidably engaged with sliding grooves 7 formed in the slit 6 (see FIGS. 5 and 6). . Two release projections 13 and 14 are formed on the back surface of the slider 11B with an extension 111 therebetween. Further, three holes 11Sf are provided on the side surface of the slider 11B, and these are constituted by through holes and non-through holes. Specifically, the hole 11Sf formed in the vicinity of the release protrusion 13 and the hole 11Sf formed in the vicinity of the release protrusion 14 are through-holes penetrating the extension portion 111, A hole 11Sf formed in the front portion of the slider 11 is a non-through hole (see FIG. 8). And although the hole 11Sf which is the said through-hole is located in the narrow slit part 6a, the half of the hole 11Sf is exposed from the narrow slit part 6a. By exposing about half of the hole 11Sf from the narrow slit 6a, dust and dust stored in the hole 11Sf can be efficiently discharged from both openings of the hole 11Sf. On the other hand, a part of the hole 11 </ b> Sf that is a non-through hole is located in the sliding protrusion 12. That is, a part of the sliding protrusion 12 is notched by the hole 11Sf. As a result, elasticity is generated in the front portion of the sliding projection 12, and a smooth sliding operation can be obtained even if some dimensional variation occurs.
In addition, a fine protrusion is formed on the circumference substantially at the center of the inner peripheral surface of the through hole 11Sf. By forming protrusions on the inner peripheral surface on the circumference, when the slider is a resin molded product, the moldability can be improved as described later.
In this example, the cross-sectional shape of the hole 11Sf is circular, but may be an ellipse, a triangle, a square, a polygon, or a combination thereof, but when the slider 11S is a molded product, In consideration of formability, a round shape is good. The number of holes 11Sf is three in this example, but may be one, four, five, or the like.

Then, one end portion (rear portion 15a) of the connecting member 15 having a color substantially the same as the color of the ink stored in the later-described cursive body is detachably inserted into the hole 11a of the slider 11B. A cylindrical ball-point refill 16B made of a resin material such as polypropylene or nylon is connected to the other end portion (front portion 15b) of the connecting member 15 (see FIG. 9).
The ballpoint pen refill 16B includes an ink storage tube (pipe portion) 16Ba formed by extrusion molding of a resin material such as polypropylene that stores ink, and a ballpoint pen tip (writing portion) press-fitted in front of the ink storage tube 16Ba. ) 16Bb and the like (see FIG. 10). Since it is press-fitted into the ink storage tube 16Ba, the outer diameter of the ballpoint pen tip 16Bb is smaller than the outer diameter of the ink storage tube 16Ba. For this reason, a step portion is formed at the front end portion of the ink storage tube 16Ba. Here, the front end portion of the ink storage tube 16Ba is 16Bf. A distance from the front end portion of the tip member 4 to the front end portion (stepped portion) 16Bf of the ballpoint pen refill 16B in the immersed state is A (FIG. 4).
Here, since the slider 11B is formed of a transparent or colored translucent material, the color and display of the connection member 15 located inside the slider 11B can be easily identified. In addition, since the slider 11B has a flat surface portion 11b and a curved surface portion 11c, the color of the connecting member 15 can be more easily identified by the lens effect obtained thereby (FIG. 11).

  A large-diameter portion 15c is formed in the intermediate portion of the connecting member 15, and excessive insertion of the rear portion 15a into the hole 11a and excessive insertion of the front portion 15b into the writing body 16B are prevented. In addition, a circumferential fitting protrusion 15d is formed on the rear portion 15a of the connecting member 15 in order to improve the insertion and fitting of the slider 11B into the hole 11a, while the front portion 15b A flat surface portion 15e is formed for air to enter the ballpoint pen refill 16B. The flat portion 15e is formed in four directions with an angle of 90 degrees. That is, the cross-sectional shape of the front portion 15b of the connection member 15 is a square shape. The four flat portions 15e are partially formed with protrusions 15f and 15g in order to obtain a good engagement / fitting force with the ballpoint pen refill 16B, but the protrusions do not overlap each other. . That is, each protrusion 15f formed on the four flat portions 15e is formed at a different position with respect to the longitudinal direction and the circumferential direction (see FIG. 12). More specifically, a protrusion 15g is formed opposite to the protrusion 15f formed at the front facing position and opposite to the protrusion 15f at an angle of 90 degrees (see FIGS. 13 and 14). reference). The air penetrating the inside of the ballpoint pen refill 16B due to the consumption of the ink is ensured, and the drop-off from the connecting member 15 due to plastic deformation of the ink containing tube 16Ba made of a resin material is prevented. That is, the ball-point pen refill 16B swells in an elliptical shape by the protrusion 15f formed in the front (the bulging part 16Bc and the ink storage tube are omitted), and the bulging part is formed by the protrusion 15g formed in the rear. The bulging portion 16Bd is also formed at an angle of 90 degrees. That is, while the bulging direction and the 90-degree rotated direction are reduced in diameter, the inner surface of the ink storage tube 16Ba bites into the protrusions 15f and 15g. As the engaging portion becomes stronger, the relative rotation between the connecting member 15 and the ink storage tube 16Ba is prevented (see FIGS. 15 and 16; the dotted line 16Be in the figure indicates the inner surface of the original ballpoint pen refill 16B). Shape.)

The protrusions 15f and 15g have an arrow shape in cross section, but the insertion side of the protrusion 15f located on the front side to the ballpoint pen refill 16 is formed at an obtuse angle (α). The separation side is formed at an acute angle (β). Incidentally, in this example, the insertion side is formed at about 150 degrees and the separation side is formed at 70 degrees (see FIG. 14).
An extension portion 11d that holds an outer diameter portion of an elastic member 17 described later is formed at the front end of the slider 11B (see FIG. 9). The length between the extended portions 11d is formed to be slightly shorter than the outer diameter of a later-described elastic member 17 so that the elastic member 17 is press-fitted into the extended portion 11d. That is, even when the ballpoint pen refill 16B is replaced, the elastic member 17 is prevented from being detached from the front end portion of the slider 11B. Further, the insertion force (fitting force) of the slider 11B to the connection member 15 (rear part 15a) is set to be weaker than the insertion force (fitting force) of the ball pen refill 16B to the connection member 15 (front part 15b). That is, when the writing body 16B is to be detached from the slider 11B, the writing pen 16B is detached from the slider 11B in a state where the ball-point pen refill 16B and the connecting member 15 are connected. Reference numeral 17 denotes a ball-point refill 16B and a resilient member such as a coil spring that urges the slider 11B connected to the ball-point refill 16 backward.

  Next, the middle shaft 5 will be specifically described. A restricting portion 18 is formed in an intermediate portion of the middle shaft 5 which is one member of the front shaft 2, and three through holes 19 into which the writing bodies 16 </ b> B and 16 </ b> S are loosely inserted are formed in the restricting portion 18. The curling bodies 16B and 16S are urged rearward by locking one end of the elastic member 17 to the restricting portion 18. In addition, three grooves 20 are formed in the longitudinal direction inside the middle shaft 5 and behind the restricting portion 18, and the legs 8 of the rear shaft 3 are slidably contacted with the grooves 20. 8 is guided. Further, the groove portion 20 has substantially the same shape as the cross-sectional shape of the leg portion 8. That is, it has a half-moon shape having an arc portion on the outside.

Next, the mechanical pencil slider 11S will be described in detail. Sliding projections 12 are formed on both sides of the slider 11S in the longitudinal direction, and are slidably engaged with sliding grooves 7 formed in the slit 6 (see FIGS. 5 and 6). . Two release protrusions 13 and 14 are formed on the back surface of the slider 11 </ b> S with an extension 111 therebetween. Further, three holes 11Sf are provided on the side surface of the slider 11S, and these are constituted by through holes and non-through holes. Specifically, the hole 11Sf formed in the vicinity of the release protrusion 13 and the hole 11Sf formed in the vicinity of the release protrusion 14 are through-holes penetrating the extension portion 111, A hole 11Sf formed in the front portion of the slider 11 is a non-through hole. And although the hole 11Sf which is the said through-hole is located in the narrow slit part 6a, the half of the hole 11Sf is exposed from the narrow slit part 6a. By exposing about half of the hole 11Sf from the narrow slit 6a, dust and dust stored in the hole 11Sf can be efficiently discharged from both openings of the hole 11Sf. On the other hand, a part of the hole 11 </ b> Sf that is a non-through hole is located in the sliding protrusion 12. That is, a part of the sliding protrusion 12 is notched by the hole 11Sf. As a result, elasticity is generated in the front portion of the sliding projection 12, and a smooth sliding operation can be obtained even if some dimensional variation occurs. In addition, a fine protrusion is formed on the circumference substantially at the center of the inner peripheral surface of the through hole 11Sf. By forming protrusions on the inner peripheral surface on the circumference, when the slider is a resin molded product, the moldability can be improved as described later.
In this example, the cross-sectional shape of the hole 11Sf is circular, but may be an ellipse, a triangle, a square, a polygon, or a combination thereof, but when the slider 11S is a molded product, In consideration of formability, a round shape is good. The number of holes 11Sf is three in this example, but may be one, four, five, or the like.

  A connecting portion 21 for connecting a core tank 161 of a mechanical pencil unit 16S described later is formed in front of the mechanical pencil slider 11S (see FIGS. 17 to 20 and FIG. 26). The connecting portion 21 will be described in detail. The connecting portion 21 includes a pyramid-shaped front cylindrical portion 22 having an inclined surface 22a that gradually changes in diameter from a circular shape to an octagonal shape from the front end toward the rear, and its A groove 23 is formed behind the front cylinder 22 and having a smaller diameter than the outer shape of the front cylinder 22. Here, the shape of the front cylinder portion 22 is an octagon, but the shape is not limited to this, and it is sufficient that the connection with the core tank 161 described later is a point contact. For example, it may be a quadrangular shape, a pentagonal shape, a decagonal shape, a dodecagonal shape, or the like. Further, an inclined surface 24 whose diameter increases toward the rear is formed behind the groove portion 23, and a rear cylinder portion 25 is formed behind the inclined surface 24. The slider 11S is formed with a substantially hemispherical flange portion 11Sd having a width larger than the width of the slit 6. By widening the flange portion 11Sd, the projecting operation of the mechanical pencil unit 16S is improved and the centering operation can be easily performed. In the centering operation, the slider 11S moves in the axial direction of the rear shaft 3. To avoid being immersed.

The mechanical pencil unit 16S also includes a core tank 161 that contains a plurality of cores and is formed of a metal material, and a chuck that holds and opens the cores that are attached to the front of the core tank 161 via a joint member 162. A body 163, a chuck ring 164 surrounding the front of the chuck body 163 and opening and closing the chuck body 163, a guide cylinder 165 arranged to cover the chuck body 163, and the guide cylinder 165 and the guide cylinder 165 It is arranged between the joint member 162 and an elastic member 166 made of a coil spring or the like that biases the chuck body 163 and the core tank 161 backward. Further, a tip member 167 is detachably attached to the tip of the guide tube 165 by means such as screwing, and the rearward movement of the lead core is restricted inside the tip member 167. A core detent member 168 made of a rubber-like elastic body is provided.
The material of the joint member 162, the guide tube 165, and the tip member 167 of the exterior parts constituting the mechanical pencil unit 16S may be subjected to surface treatment such as plating on a metal such as brass, or a resin molded product such as polyacetal or nylon But it ’s okay.
Since the tip member 167 protrudes from the tip of the shaft body 1 and is easily visible, the metal material is preferably plated, and the joint member 162 and the guide tube 165 slide with each other by a core feeding operation described later. It is better to use polyacetal or nylon resin with lubricity. In this case, the joint member 162 and the guide tube 165 may be made of the same resin. However, when the resin is different, for example, polyacetal or nylon resin, the slidability of the core feeding operation is improved. When using the same resin, use different grades. Thus, by making a hardness difference between the members that slide with each other, the slidability is improved.

The configuration of each member constituting the mechanical pencil unit S will be described in detail.
The lead tank 161 and the joint member 162 are connected by a connecting portion 162a provided behind the joint member 162 being fitted into the lead tank 161, and the fitting is provided in front of the connecting portion 162a. When the front end portion of the core tank 161 comes into contact with the end surface of the rear step portion 162bA of the large diameter portion 162b, the fitting is completed.
The guide cylinder 165 is formed such that the rear portion of the guide cylinder 165 has a large-diameter portion 165a, a taper portion 165b and a small-diameter portion 165c. The outer diameter of the rear end of the small diameter portion 165c or the tapered portion 165b is larger than the reduced diameter portion 162c of the joint member 162 and is substantially the same as the outer diameter of the large diameter portion 162b of the joint member 162. The small diameter portion 165c may or may not be provided, but the tapered portion 165b is necessary. This is because when a later-described mechanical pencil unit 16S is housed in the shaft body 1, the front end portion 16Bf of the ink housing tube 16Ba is smoothly housed so as not to be caught by the guide tube 165 and become a resistance. That is, when the mechanical pencil unit 16S is housed in the shaft body 1, the slider 11B is pressed by causing the release protrusions 13 and 14 formed on the back surfaces of the sliders 11S and 11B to collide with each other. 11S is disengaged. At this time, since the slider 11B slightly presses the slider 11S which is another slider, the pressed writing body may advance by that amount and come into contact with the guide cylinder. However, even if another cursive body comes into contact with the guide cylinder of the mechanical pencil unit, the taper portion 165b is present, so there is no rubbing resistance due to the front end portion 16Bf of the ball pen refill 16B, and the backward movement of the mechanical pencil unit 16S. (Storing) can be performed smoothly.
Furthermore, the elastic member 166 rubs against other writing bodies in the process of moving in and out of the mechanical pencil unit 16S and in the process of feeding out the core, and the sliding operation feeling becomes worse or the operation suddenly becomes heavy. In order to prevent this, it is preferable to arrange the guide tube 165 inside.

  Next, the connecting portion between the mechanical pencil slider 11S and the mechanical pencil unit 16S (core tank 161) will be described in detail. The connecting portion 21 of the slider 11S is inserted into the rear end portion of the lead tank 161, and the inclined surface 22a of the front tube portion 22 and the lead tank 161 are interposed between the front tube portion 22 and the lead tank 161 of the slider 11S. A front space 26 is formed by the inner surface. In addition, by setting the outer shape of the rear cylinder portion 25 to be smaller than the inner shape of the core tank 161, the rear space portion 27 is formed with each dimensional difference. A gap 30 is formed at the rear end of the slider 11S and the lead tank 161. In this state, the outside of the core tank 161 near the groove 23 of the slider 11S is caulked so as to be reduced in the radial direction (caulking portion 28). The caulking portion 28 is caulked circumferentially in this example, but may be caulked partially. The core tank 161 is fixed by this caulking portion 28 without dropping from the slider 11S. Further, the inner surface of the core tank 161 and the rear end portion of the front cylindrical portion 22 are in point contact since the shape of the rear end portion is an octagon. Further, the mechanical pencil unit 16S is rotatably connected by the front space portion 26, the rear space portion 27, and the gap 30. Here, the front cylinder portion 22 of the slider 11S is inclined by reducing the diameter toward the front, but this is a guide portion when the lead tank 161 is inserted. By securing the length of the front cylindrical portion 22 to some extent, it plays a role as an inner surface guide when caulking the lead tank 161 at the same time as the guide when the lead tank 161 is inserted. The clearance 30 is set so that the mechanical pencil unit 16S can be rotated with respect to the slider 11S, and the rear end surface of the lead tank 161 is not in contact with the rear end surface of the connecting portion 21 of the slider 11S during the rotation. Has been. As a result, the mechanical pencil unit 16S can be smoothly rotated, and the in / out operation can be easily performed. Further, the rotation range of the mechanical pencil unit 16 </ b> S is regulated by the rear end inner surface of the lead tank 161 contacting the surface of the rear cylinder part 25. When the slider 11S is pressed forward by this contact, the inner surface portion of the rear end of the lead tank 161 acts so as to bite the rear cylinder portion 25, and the mechanical pencil is surely moved without losing the forward movement of the slider 11S. It can be transmitted to the unit 16S (core tank 161).

The configuration of the connecting portion between the mechanical pencil slider 11S and the mechanical pencil unit 16S (core tank 161) is not limited to the point contact configuration described above.
For example, the lead tank 161 is bent in the vicinity of the connecting portion 21 in front of the mechanical pencil slider 11S (bending portion 161b; see FIGS. 21A and 21B) and mounted on the shaft body 1. The front part of the mechanical pencil unit 16Sb may be directed in the direction of the central axis of the shaft body 1. In this case, the lead tank 161 may be detachably fixed to the connecting portion 21 of the slider 11S by means such as adhesion.
Moreover, even if the core tank 161 of the cylindrical mechanical pencil unit 16S made of a resin material such as polypropylene or nylon or a metal material is connected to the connecting portion 21 by a caulking process (caulking portion 161a) so as not to rotate. good. The caulking portion 161a is formed over the circumference. Of course, it may be squeezed from a plurality of directions and can be appropriately selected. It may be detachable and inserted so as not to rotate.
Alternatively, the connecting portion 21 may be bent so that the front of the mechanical pencil unit 16S is directed toward the center (see FIGS. 22 and 23). More specifically, the connecting part 21 of the slider 11S is bent at an angle with respect to the rear base part excluding the connecting part 21 of the slider 11S.

Next, the operation will be described with reference to FIGS. 3, 24 to 27, and 30. When the slider 11S is pressed forward (in the diagonally upper left direction in FIG. 23), the slider 11S moves forward with the mechanical pencil unit 16S while being guided by the slit 6, the sliding groove 7, and the slit 6a of the rear shaft 3, and the mechanical pencil. The tip of the unit 16S protrudes from the tip of the shaft body 1 (see FIG. 26). At the same time, the slider 11S is pushed in the axial direction, which is the inner side of the rear shaft 3, but the flange portion 11Sd abuts on the outer peripheral surfaces on both sides of the slit 6 of the rear shaft 3, and the pushing of the slider 11S is restricted. Next, the rear end (upward in FIG. 25) of the sliding protrusion 12 formed on the side surface portion of the slider 11S engages with the front end portion of the sliding groove 7 to prevent the mechanical pencil unit 16S from retracting, The forward position of the mechanical pencil unit 16S is maintained. That is, by forming the sliding groove 7 only up to the middle portion of the slit 6, the slider 11S is also engaged. In the projecting process of the mechanical pencil unit 16S, the rear portion of the slider 11S sinks in the direction of the central axis of the shaft main body 1, and the front portion of the mechanical pencil unit 16S attempts to approach the inner wall surface of the shaft main body 1. Since the mechanical pencil unit 16S is rotatably connected at the rear part thereof, the front part of the mechanical pencil unit 16S protrudes while maintaining a straight line. In addition, the distance from the front end of the tip member 4 at this time to the front step portion 162bB of the large diameter portion 162b is defined as B (see FIG. 27). In the protruding state of the mechanical pencil unit 16S, the front step portion 162bB of the mechanical pencil unit is located behind the front end portion (step portion) 16Bf of the ball-pen refill 16B (B> A).
Here, when the upper end 11Se of the flange portion 11Sd of the slider 11S is pressed forward in the forward position where the tip of the mechanical pencil unit 16S protrudes from the tip of the shaft body 1, the tip member 167 of the mechanical pencil unit 16S is The tip member 4 abuts on the conical portion 4a whose diameter gradually decreases toward the tip end side of the inner diameter portion, and the mechanical pencil unit 16S is prevented from moving forward. The outer peripheral surface of the tip member 167 has a plurality of step portions, and the outer diameter of the tip member 167 on the rear side is larger than the outer diameter of the tip member 167 on the front side in each step portion. . For this reason, when the mechanical pencil unit 16S is advanced, the tip member 167 of the mechanical pencil unit 16S comes into contact with the tip member 4 of the shaft body 1. Here, when the slider 11S is further pressed, the lead tank 161 and the chuck body 163 move forward against the elastic force of the elastic member 166, and the front step portion 162bB front end of the large diameter portion 162b is a guide cylinder. By abutting against the rear end of the small-diameter portion 165c of 165, the forward end is completed, and this is the stroke of the core pushing-out pressing operation. The reduced diameter portion 162c of the joint member 162 is accommodated inside the guide tube 165 (the distance from the front end of the tip member 4 to the front step portion 162bB of the large diameter portion 162b is C). (FIG. 30)). As a result, the lead is extended. At this time, as described above, the rotation range of the mechanical pencil unit 16S is restricted by the rear end inner surface portion of the lead tank 161 coming into contact with the surface of the rear cylinder portion 25, and this contact pushes the slider 11S forward. When this occurs, the inner surface of the rear end of the lead tank 161 acts so that the rear cylinder part 25 bites, and the forward movement of the slider 11S is reliably transmitted to the mechanical pencil unit 16S (lead tank 161) without loss. It can be done. Even in the maximum advance state of the mechanical pencil unit when the lead is pushed out, the front step portion 162bB of the mechanical pencil unit is located behind the front end portion (step portion) 16Bf of the ball pen refill 16B. (C> A).
In the course of the center feeding operation, the flange portion 11Sd of the slider 11S is in sliding contact with the outer peripheral surface of the rear shaft 3. In the present invention, when the slider 11S is moved back and forth during the lead feeding operation process, the slider 11B is not involved with the slider 11B of another ballpoint pen refill. That is, the slider 11S and the mechanical pencil unit provided in front of the slider 11S move back and forth independently. For this reason, at the time of the lead feeding operation, the ball pen refill (other writing bodies excluding the mechanical pencil unit) does not move slightly back and forth. When the lead of the mechanical pencil unit is extended, only the mechanical pencil unit moves back and forth with respect to the shaft body 1. As described above, only the mechanical pencil unit moves back and forth with respect to the shaft main body 1, so that an excellent new feeding operation can be performed without increasing the core feeding operation load.

Next, when the mechanical pencil unit 16S is to be stored in the shaft body 1, the other slider 11B is pressed. When the other slider 11B is pressed, the release protrusions 13 and 14 formed on the back surfaces of the sliders 11S and 11B collide with each other. By this collision action, the slider 11 </ b> S being pressed is pressed toward the outside of the rear shaft 3. Then, by this pressing action, the engagement between the sliding projection 12 of the slider 11S and the sliding groove 7 is released, and the mechanical pencil unit 16S which is in the projecting state by the releasing action is caused by the action of the elastic member 17. The slider 11S moves backward and is immersed in the shaft body 1, and the slider 11S returns to the original retracted position.
Note that FIG. 24B illustrates a state in which the slider 11S has advanced. In this state, the rear shaft 3 has a large space portion including the slit 6 and the narrow slit portion 6a. In this state, as a matter of course, if the lead feeding operation is further performed, foreign matter such as dust and dirt can easily enter the space. As a result, foreign matter such as dust and dust is likely to stick to the wall surfaces of the slit 6 and the narrow slit portion 6a and the slide surface 3a.
However, since the slit 6 is close to the outer peripheral surface, it is easy to remove foreign matters such as dust and dust, and since the slide surface 3a slides while the back surface of the sliding projection 12 is in contact, foreign matters such as dust and dust are easily scraped off. It has become. However, since the narrow slit portion 6a is located in the vicinity of the axial center, it is difficult to remove foreign matters such as dust and dirt. Therefore, in the present embodiment, the hole 11Sf of the slider 11S is removed so as to scrape off dust and dirt from the narrow slit portion 6a by the retreating operation of housing the mechanical pencil unit 16S in the shaft body 1, and the hole 11Sf. The foreign material scraped off is stored. And after storing, it discharges | emits from the part exposed from the narrow slit part 6a of the hole 11Sf.

In the process of projecting and retracting the mechanical pencil unit 16S and the process of extending the core, it is important that when the mechanical pencil unit 16S is in the protruding state, the front step portion 162bB of the large diameter portion 162b of the joint member 162 is the front end of the ink containing tube 16Ba. It is configured to be positioned behind the portion (stepped portion) 16Bf. That is, the front step portion of the mechanical pencil unit 16S in the process of projecting and retracting the mechanical pencil unit 16S and the process of extending the core more than the distance A from the front end portion of the tip member 4 of the stepped portion 16Bf of the immersed ball pen refill. The distances B and C from the front end of the 162bB tip member are always larger (see FIGS. 27 to 30). This is to prevent the front step portion 162bB of the large diameter portion 162b from rubbing against the front end portion 16Bf to deteriorate the feeling of sliding operation.
As described above, the lead-out operation is performed by pressing the upper portion 11Se of the flange portion 11Sd of the slider 11S in the forward direction at the forward movement position where the tip of the mechanical pencil unit 16S protrudes from the tip of the shaft body 1. The tip member 167 of the pencil unit 16S comes into contact with the conical portion 4a whose diameter gradually decreases toward the distal end side of the inner diameter portion of the tip member 4, and the forward movement of the mechanical pencil unit 16S is prevented. Here, when the slider 11S is further pressed, the lead tank 161 and the chuck body 163 move forward against the elastic force of the elastic member 166, and the front step portion 162bB of the large diameter portion 162b is moved to the guide tube 165. The advancing is completed by abutting the rear end of the small-diameter portion 165c, and this is a stroke of the lead feeding and pressing operation. The reduced diameter portion 162c of the joint member 162 is just accommodated inside the guide tube 165 (see FIG. 30). As a result, the lead is extended. Accordingly, even in the course of the lead feeding operation, the front step portion 162bB of the large diameter portion 162b does not rub against the front end portion 16Bf and the sliding operation feeling is not deteriorated, and the sliding operation feeling can be kept good. .
A step portion is also formed on the tip member 167, but since it is a tip portion, it does not rub against other cursive bodies. (See Figure 27)
In the present embodiment, the large diameter portion 162b of the joint member 162 is behind the front end portion 16bf of the ink containing tube 16Ba of the ballpoint pen refill 16B in the process of extending and retracting the mechanical pencil unit 16S and the process of extending the core. Therefore, not only the front step portion 162bB but also the rear step portion 162bA does not rub against the front end portion 16bf of the ink containing tube 16Ba. Therefore, the ball-point pen refill 16B is not caught by the rear step portion 162bA of the joint member 162 when the mechanical pencil unit 16S is immersed or retracted in the lead-out process, and the sliding operation feeling is also good in this respect. . Further, since there is no increase in the core feeding operation load that occurs when the ballpoint pen refill 16B is caught by the rear step portion 162bA of the joint member 162, the sliding operation can be performed satisfactorily.

Further, a modification of the large diameter portion of the joint member will be described with reference to FIG.
This is an example in which a plurality of protrusions (bulging portions) 31 are formed on the joint member 162 instead of the large-diameter portion 162b having the shape of the entire periphery of the joint member 162. Since the circumscribed circle diameter and the length in the longitudinal direction of the protrusion (bulged portion) 31 are substantially the same as those of the large diameter portion 162b, the rear end 16bf of the ink containing tube 16Ba of the ballpoint pen refill 16B is rearward. The rear step portion 31a as well as the front step portion 31b of the protrusion 31 does not rub against the front end portion 16bf of the ink containing tube 16Ba. However, even if rubbing, the contact area is reduced as compared with the large-diameter portion 162b, and the influence is reduced. Since the front step portion 31b and the rear step portion 31a are provided with the R shape 31c, the sliding operation feeling of the mechanical pencil unit 16S is improved.
In addition, when the large-diameter portion 162b of the joint member 162 is formed as in this modification, a more stable centering pressing force can be obtained. More specifically, in the case of this modified example, during the center feeding operation, the forward step portion 31b of the protrusion 31 of the joint member 162 comes into contact with the rear end of the small diameter portion 165c of the guide tube 165, thereby completing the forward movement. This is the stroke of the lead feeding pressing operation. Accordingly, the plurality of protrusions 31 come into contact with the small diameter portion 165c of the guide tube 162, so that foreign matters such as dust and dust are hardly caught. Therefore, a stable centering pressing force can be obtained.

1 Shaft body (shaft tube)
2 Front shaft 3 Rear shaft 3a Sliding surface 4 Tip member 4a Conical portion 4b Projection hole 4c Plane portion 5 Middle shaft 6 Slit 6a Slit 7 Sliding groove 8 Leg portion 9 Clip portion 10 Ball portion 11 Slider 111 Extension portion 11B For ball pen refill Slider 11S slider for mechanical pencil unit 11Sd flange 11Se upper part 11Sf hole 11a hole 11b plane part 11c arcuate curved surface part 11d extension part 12 sliding protrusion 13 releasing protrusion 14 releasing protrusion 15 connecting member 15a rear part 15b front part 15c Large diameter portion 15d Fitting protrusion 15e Flat portion 15f Protrusion 15g Protrusion 16B Ballpoint pen refill 16Ba Ink receiving tube (pipe portion)
16Bb ballpoint pen tip (writing part)
16Bc bulging part 16Bd bulging part 16Be inner surface shape 16Bf front end part (step part)
16S mechanical pencil unit 16Sa core tank 16Sb mechanical pencil set 161 core tank 161a caulking portion 161b bent portion 162 joint member 162a connecting portion 162b large diameter portion 162bA rear step portion 162bB front step portion 162c reduced diameter portion 163 chuck ring body 163 chuck ring body Tube 165a Large diameter portion 165b Tapered portion 165c Small diameter portion 166 Repellent member 167 Lead member 168 Core detent member 17 Repellent member 18 Connection portion 19 Through hole 20 Groove portion 21 Connection portion 22 Front tube portion 23 Groove portion 24 Inclined surface 25 Back tube Part 26 front space part 27 rear space part 28 caulking part 30 gap 31 protrusion (bulging part)
31a Rear step
31b Front step part 31c R shape

Claims (3)

A core tank that houses the core, a chuck body that grips and opens the core attached to the front of the core tank via a joint member, and a chuck that surrounds the front of the chuck body and opens and closes the chuck body Multiple writing bodies including at least a mechanical pencil unit with a ring, a resilient member that urges the chuck body and core tank toward the rear, and a tip member that houses a core detent member can be projected and retracted in the shaft body. The joint member of the mechanical pencil unit moves back and forth with respect to the tip member, and the joint member is formed by a large diameter portion and a small diameter portion located in front of the large diameter portion. The other writing body excluding the mechanical pencil unit is formed with a writing part provided at the tip and a diameter larger than that of the writing part. The mechanical pencil unit has a pipe part connected to the writing part, and a step part is formed at the connection part between the writing part and the pipe part, and the mechanical pencil unit is always in a state where the mechanical pencil unit goes from a protruding state to an immersive state. The dual writing instrument, wherein the front step portion is positioned rearward of the step portion formed in the other writing body. The writing instrument according to claim 1, wherein the elastic member of the mechanical pencil unit is disposed inside a tip member of the mechanical pencil unit or a member connected to the tip member. The writing instrument according to claim 1 or 2, wherein the large-diameter portion of the joint member of the mechanical pencil unit includes a plurality of protrusions.

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