JP2008194927A - Clip fitting structure of writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clip fitting structure, of a writing utensil, which allows comparatively easier fixing of a tail crown to a barrel without worsening the presentable appearance of the writing utensil and also, secure fitting of a clip to the barrel. <P>SOLUTION: This clip fitting structure comprises the following components: (1) a barrel 11 with a notch 12 formed at the rear end and a securing hole 13 axially formed forward of the notch 12, (2) a clip body 22, (3) a fitting plate 23 with an apex edge, formed from both sides of the rear part, coming into contact with the outer surface of the barrel 11, (4) a fitting piece 24 to be secured to the hole edge of the securing hole 13, (5) a clip 21 with a securing piece 27 to be fitted into the notch 12 in the state that the fitting piece 24 is secured to the hole edge of the securing hole 13, (6) an insertion part 32 to be inserted into the rear part of the barrel 11 from the rear end of the barrel 11, and (7) the tail crown 31 with a large diametral part 33 which comes into contact with the securing piece 27 fitted into the notch 12 and inhibits the movement of the clip 21 to the rear. In addition, a securing projection 16 which swells toward the inner part of the barrel 11 from its inner periphery, is formed at the rear part of the barrel 11, and a securing recess 34 to which the securing projection 16 is secured, in the state that the large diametral part 33 is brought into contact with the securing piece 27, is formed in the insertion part 32. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a clip attachment structure for a writing instrument in which a clip is attached to a shaft cylinder in a writing instrument such as a ballpoint pen, a mechanical pencil, or a composite writing instrument having a plurality of writing shaft bodies made of these.

  The clip of the writing instrument is an important part in terms of function and appearance design for the writing instrument, and is required to have a simple mounting structure and be securely attached without rattling. As this simple clip mounting structure, the clip is formed of a metal plate rich in elasticity, a clip main body provided along the shaft tube, a mounting portion provided at the rear of the clip main body, and a front of the mounting portion There is known one provided with a mounting piece extending in the direction. In this conventional clip mounting structure, a locking hole is formed in the shaft tube to which the clip is mounted, the clip mounting piece is inserted into the locking hole of the shaft tube, and the clip is moved forward, so that the mounting piece Is secured to the hole edge of the locking hole, so that the clip is attached to the shaft tube.

In recent years, in order to attach the clip more firmly, a notch is formed at the rear end of the shaft cylinder, and the locking piece is fitted into the notch in a state where the mounting piece is locked to the hole edge of the locking hole. Is also formed on the rear end of the clip, and this locking piece is pressed by a tail crown attached to the rear part of the shaft cylinder (for example, see Patent Document 1). The tail cap in this clip mounting structure has an insertion portion that is press-fitted into the rear portion of the shaft cylinder, and a large amount that abuts against a locking piece fitted into the notch while the insertion portion is press-fitted into the shaft cylinder from the rear. The diameter portion is formed integrally with the insertion portion. In this clip mounting structure, when the large diameter portion of the tail crown abuts against the locking piece from the rear side, the movement of the clip formed at the rear end of the locking piece is prohibited, thereby preventing the clip from moving. In addition to being firmly attached to the shaft tube, the large-diameter portion covers the locking piece, thereby preventing a gap from being generated between them and improving the appearance of the appearance.
Japanese Patent Laid-Open No. 10-100590 (specifications [0008], [0011], FIGS. 1 to 3)

  However, in the conventional clip mounting structure described above, it is a relatively difficult task to press-fit the insertion portion of the tail crown into the rear portion of the shaft cylinder, and it still has to be solved using a dedicated tool. Issues that should remain were left. In addition, in the conventional clip mounting structure in which the insertion part of the tail crown is press-fitted into the rear part of the shaft cylinder, when a force exceeding the press-fit force acts on the clip backward, the tail crown is detached from the shaft cylinder together with the clip. was there. In addition, even if it does not detach, if a backward force is repeatedly applied to the clip, the press-fitted tail crown gradually moves backward from the rear end of the shaft cylinder and floats, and the clip is gradually loosened. was there. In order to eliminate such problems, it is necessary to increase the press-fitting force. However, increasing the press-fitting force makes the press-fitting operation more difficult and can withstand the increased force. There was also a problem that the shaft cylinder and the tail crown were required, and the structure of the shaft cylinder and the tail crown was complicated. As another alternative, it is conceivable to screw the tail crown to the shaft tube, but in order to screw the tail crown to the shaft tube, the tail crown is rotated a plurality of times with respect to the shaft tube. There is a problem that it is necessary and the rotation work is troublesome.

An object of the present invention is to provide a clip attachment structure for a writing instrument in which a tail crown is attached to a shaft tube relatively easily and a clip is firmly attached to the shaft tube.
Another object of the present invention is to provide a clip attachment structure for a writing instrument in which a clip is firmly attached to a shaft tube without deteriorating the appearance.

As shown in FIG. 1, the invention according to claim 1 includes a shaft cylinder 11 having a notch 12 formed at the rear end and a locking hole 13 formed at the front of the notch 12 in the axial direction, and a shaft cylinder. 11 is formed at the rear portion of the clip body 22 and the clip body 22 provided along the line 11, moves forward, engages with the hole edge of the locking hole 13, moves rearward, and disengages from the hole edge of the locking hole 13. A clip 21 having a mounting piece 24 and a locking piece 27 provided at the rear end of the clip main body 22 and fitted in the notch 12 in a state where the mounting piece 24 is locked to a hole edge of the locking hole 13, and the shaft cylinder 11. An insertion portion 32 inserted in the rear portion and a rear portion formed in the rear portion of the insertion portion 32 abuts against the locking piece 27 in a state where the insertion portion 32 is inserted into the shaft tube 11 and prohibits the backward movement of the clip 21. By improving the clip mounting structure of a writing instrument provided with a tail crown 31 having a diameter portion 33 That.
The characteristic configuration is that a locking projection 16 bulging from the inner periphery toward the inside of the cylinder is formed at the rear part of the shaft cylinder 11, and the large diameter part 33 is in contact with the locking piece 27. A locked recess 34 for locking the projection 16 is formed in the insertion portion 32.

  In the clip mounting structure for a writing instrument according to the first aspect, the insertion portion 22 of the tail crown 21 is inserted into the rear portion of the shaft tube 11 from the rear end, and the locking projection 16 is locked to the locked recess 34. The tail crown 31 can be fixed to the shaft tube 11 by a relatively simple operation. Here, the clip 21 is attached to the shaft cylinder 11 in advance by moving forward and locking the mounting piece 24 to the hole edge of the locking hole 13. The tail crown 31 fixed to the shaft cylinder 11 abuts the locking piece 27 having the large-diameter portion 33 fitted in the notch 12 to prohibit the rearward movement of the clip 21. Therefore, the clip 21 is attached to the shaft cylinder by a relatively simple operation of inserting the insertion portion 22 of the tail cap 21 into the rear portion of the shaft cylinder 11 and locking the locking projection 16 to the locked recess 34. 11 can be fixed relatively firmly. The tail crown 31 with the locking protrusion 16 locked to the locked recess 34 moves rearward from the rear end of the shaft tube 11 and rises even if a rearward force is repeatedly applied to the clip 21. There is no such thing. For this reason, the situation where the clip 21 is loosened gradually can be avoided.

  The invention according to claim 2 is the invention according to claim 1, and further, as shown in FIG. 3, the shaft cylinder 11 is made of metal, and the locking projection 16 has a front end edge 16 a orthogonal to the axial direction. The locking projection 16 made of the cut piece is formed to be inclined so as to reduce the inner diameter of the shaft tube 11 from the rear to the front. The locking recess 34 is a groove formed on the outer periphery of the insertion portion 32 in the circumferential direction so that the front surface 34a is orthogonal to the axial direction, and the front surface 34a is the locking protrusion when the locking protrusion 16 is locked. 16 is configured to abut against the front edge 16a.

  When the insertion portion 22 of the tail crown 21 is inserted into the rear portion of the shaft cylinder 11 from the rear end, the locking projection 16 or the insertion portion 22 of the tail crown 21 is elastically deformed, and then the locking projection 16 is moved into the locked recess. The elastic deformation is restored at the stage of facing 34, and the locking projection 16 is inserted into the locked recess 34 and locked. In the clip mounting structure of the writing instrument described in claim 2, since the locking projection 16 made of a cut piece is inclined so as to reduce the inner diameter of the shaft tube 11 from the rear to the front, When the insertion portion 22 of the crown 21 is inserted into the rear portion of the shaft tube 11, the insertion portion 22 of the locking projection 16 or the tail crown 21 is elastically deformed according to the inclination of the locking projection 16, so that the insertion operation is relatively easy. Can be done.

On the other hand, in a state where the elastic deformation is restored and the locking projection 16 is inserted into the locked recess 34 and locked, the front surface 34a of the locked recess 34 contacts the front edge 16a of the locking projection 16. Therefore, it is extremely difficult to disengage the tail crown 31 inserted into the locked recess 34 from the shaft tube 11. As a result, it is possible to obtain the tail crown 31 that is easy to insert into the shaft cylinder 11 and that is difficult to remove. The tail crown 31 can be attached to the shaft cylinder 11 relatively easily and the tail crown 31 that is difficult to remove from the shaft cylinder 11. The clip 21 can be firmly attached to the shaft cylinder 11.
Further, when the locking projection 16 is inserted into the locked recess 34, the front surface 34a of the locked recess 34 abuts and locks against the front edge 16a of the locking projection 16, so that the tail crown 21 is pivoted. A moderation feeling can be given to inserting the locking projection 16 into the locked recess 34 by being inserted into the rear portion of the cylinder 11, and the locking projection 16 is locked to the locked recess 34. The state in which the locking protrusion 16 is locked in the locked recess 34 can be clearly distinguished from the state in which the locking protrusion 16 is locked.

The invention according to claim 3 is the invention according to claim 2, characterized in that a locking projection 16 is formed in the rear part of the shaft cylinder 11 which is in front of the notch 12 and is covered by the clip 21. To do.
The locking projection 16 made of a cut piece cut out into the cylinder causes a dent on the outer surface of the metal shaft cylinder 11, but in the clip mounting structure for a writing instrument according to claim 3, Since the clip 21 covers the locking projection 16 that causes the outer surface to have a dent, the dent on the outer surface caused by the locking projection 16 is not visible from the outside. For this reason, the clip 21 can be firmly attached to the shaft tube 11 without deteriorating the appearance.
Further, when a backward force is applied to the clip 21, the force acts in a direction to remove the tail crown 31 from the shaft tube 11 via the clip 21, but it is used for locking the rear portion of the shaft tube 11 covered by the clip 21. Since the projection 16 is formed, the force can be reliably supported by the locking projection 16 in which the front end edge 16a is in contact with the front surface 34a of the locked recess 34. As a result, it is possible to effectively prevent the tail crown 31 from moving rearward from the rear end of the shaft tube 11 and lifting it, and to avoid a situation where the attachment of the clip 21 is loosened and rattling.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the mounting plate 23 whose tip edge abuts on the outer surface of the shaft cylinder 11 is formed from both sides in the width direction at the rear portion of the clip body 22. A seat surface 14 formed toward the shaft cylinder 11 and on which the front end edge of the mounting plate 23 is seated extends forward from the rear end of the shaft cylinder 11 and is formed on the outer surface of the shaft cylinder 11.
In order to attach the clip 21 to the shaft cylinder 11, the mounting piece 24 formed at the rear portion of the clip 21 is inserted into the locking hole 13 of the shaft cylinder 11 and the clip 21 is moved forward to lock the mounting piece 24. It is necessary to be engaged with the hole edge of the hole 13. In the clip mounting structure for a writing instrument described in claim 4, the seat surface 14 on which the tip edge of the mounting plate 23 is seated is formed on the outer surface of the shaft tube 11. By attaching the mounting plate 23 to the seating surface 14 using the surface 14 as a mark, the mounting piece 24 can be inserted into the locking hole 13 of the shaft cylinder 11, and the mounting work of the clip 21 can be facilitated. .
Further, since the tip edge of the mounting plate 23 abuts against the seat surface 14 in a state where the mounting piece 24 is locked to the hole edge of the locking hole 13, the clip 21 attached to the shaft tube 11 is connected to the circumference of the shaft tube 11. Therefore, the clip 21 can be prevented from moving in the direction and the stability of the clip 21 can be sufficiently secured.

The invention according to claim 5 is the invention according to claim 4, characterized in that the seating surface 14 is formed by bending the outer periphery of the shaft tube 11 into a V-shaped cross section as shown in FIG. And
In the clip mounting structure of the writing instrument described in claim 5, when the insertion portion 22 of the tail cap 21 is inserted into the shaft tube 11, the outer periphery of the shaft tube 11 is V-shaped in cross section as shown by a one-dot chain line in FIG. The latching protrusion 16 can be pulled away from the outer surface of the insertion portion 22 by elastically deforming so that the V-shaped cross-sectional shape of the seating surface 14 formed by bending it into a shape is extended. For this reason, the operation | work which inserts the insertion part 22 of the tail cap 21 in the axial cylinder 11 can be further facilitated.

The invention according to claim 6 is the invention according to claim 5, characterized in that a guide groove 36 facing the seating surface 14 is formed on the outer periphery of the insertion portion 32 so as to extend in the axial direction.
In the writing instrument clip mounting structure according to the sixth aspect of the present invention, the guide groove 36 facing the seat surface 14 is formed on the outer periphery of the insertion portion 32 so as to extend in the axial direction. At this time, by inserting the insertion portion 22 into the shaft cylinder 11 so that the guide groove 36 is aligned with the seating surface 14 using the guide groove 36 as a mark, the locked recess 34 is positioned behind the locking projection 16. The tail crown 31 can be attached relatively easily.

The invention according to claim 7 is the invention according to any one of claims 4 to 6, wherein the attachment piece 24 is formed at a front portion at the tip of the attachment plate 23, and the clip 21 moves forward to attach the attachment piece. An auxiliary attachment piece 26 that is engaged with the notch 12 in a state in which 24 is engaged with the hole edge of the engagement hole 13 is formed on the rear portion of the attachment plate 23 or on the engagement piece 27.
In the clip mounting structure for a writing instrument described in claim 7, the mounting piece 24 formed on the mounting plate 23 is locked to the hole edge of the locking hole 13 of the shaft tube 11, and the mounting plate 23 or the locking piece 27 is engaged. The clip 21 can be attached to the shaft tube 11 by engaging the auxiliary mounting piece 26 formed on the notch 12 of the shaft tube 11. For this reason, the latching location with respect to the axial cylinder 11 of the clip 21 can be increased, and thereby the stability of the clip 21 attached to the axial cylinder 11 can be sufficiently ensured.

  In the clip mounting structure for a writing instrument according to the present invention, a locking projection that bulges from the inner periphery toward the inside of the cylinder is formed at the rear portion of the shaft cylinder, and the locked recess to which the locking protrusion is locked is formed as a tail crown. Since the insertion part of the tail crown is inserted into the rear part of the shaft cylinder from the rear end and the locking projection is locked to the locked recess, the tail crown is formed by a relatively simple operation. Can be fixed to the shaft. Here, the large diameter part of the tail cap fixed to the shaft cylinder abuts on the locking piece, and prohibits the rearward movement of the clip. Therefore, the clip attached to the shaft tube from the rear can be relatively firmly fixed to the shaft tube by a relatively simple operation in which the insertion portion of the tail crown is inserted into the rear portion of the shaft tube.

  Further, if the locking projection is made of a cut piece cut out into the cylinder of the metal shaft cylinder, and the locking projection made of the cut piece is formed to be inclined, the insertion portion of the tail crown is pivoted. When inserted into the rear part of the cylinder, the locking projection or the insertion portion of the tail crown is elastically deformed according to the inclination of the locking projection, so that the insertion operation can be performed relatively easily. Also, if the locked recess is in the inserted state of the locking projection and the front surface is in contact with the front end edge of the locking projection, it becomes extremely difficult to remove the tail crown from the shaft tube, and the clip is attached to the shaft tube. Can be firmly fixed. Then, if a locking projection is formed in the front part of the shaft cylinder covered with the clip in front of the notch, the clip covers the recess on the outer surface caused by the locking projection, and the recess is visually recognized. It can be avoided that the appearance on the appearance caused by the deterioration is deteriorated.

In addition, a mounting plate whose tip edge abuts on the outer surface of the shaft cylinder is formed from both sides of the rear portion of the clip body in the width direction toward the shaft cylinder, and a seating surface on which the tip edge of the mounting plate is seated is formed on the outer surface of the shaft cylinder. If it is formed, the mounting piece can be inserted into the locking hole of the shaft tube by attaching the mounting plate to the seat surface using this seating surface as a mark when mounting the clip to the shaft tube. Can be easily. Further, since the tip edge of the mounting plate abuts against the seat surface in a state where the mounting piece is locked to the hole edge of the locking hole, the stability of the clip attached to the shaft tube can be sufficiently ensured. In this case, if the seating surface is formed by bending the outer periphery of the shaft cylinder into a V-shaped cross section, inserting the tail crown insertion portion into the shaft cylinder will extend the V-shaped cross-sectional shape of the seating surface. By elastically deforming, the operation of pulling the locking protrusion away from the outer surface of the insertion portion and inserting the insertion portion of the tail crown into the shaft tube can be facilitated.
Further, an attachment piece is formed at the front part at the front end of the attachment plate, and the auxiliary attachment piece to be engaged with the notch in a state where the attachment piece is engaged with the hole edge of the engagement hole, or the rear part or the engagement at the front end of the attachment plate. If it forms in a piece, the latching location with respect to the axial cylinder of a clip will increase, and this can fully ensure the stability of the clip attached to the axial cylinder.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 1, the clip mounting structure for a writing instrument of the present invention is such that the clip 21 is locked to the rear portion of the shaft cylinder 11, and then the tail crown 31 is mounted on the shaft cylinder 11 from the rear to attach the clip 21 to its shaft. The structure is fixed to the cylinder 11. The shaft cylinder 11 is made of metal and is formed in a cylindrical shape. A notch 12 is formed at the rear end of the shaft cylinder 11, and a rectangular locking hole 13 is formed at the rear of the shaft cylinder 11 in front of the notch 12 in the axial direction. Further, on the outer surface of the shaft cylinder 11, a pair of belt-like seating surfaces 14 and 14 on which the leading edges of a pair of mounting plates 23 in a clip 21 described later are seated sandwich the notch 12 and the locking hole 13. 11 extends forward from the rear end. The pair of seating surfaces 14, 14 are formed on the outer surface of the shaft cylinder 11 at a predetermined interval in the outer circumferential direction, and the notch 12 and the rectangular locking hole 13 are respectively formed in the pair of seating surfaces 14, 14. Formed between.

  As shown in FIGS. 2 and 4, the pair of seating surfaces 14, 14 in this embodiment has outer peripheries such that a cross-sectional shape in a plane perpendicular to the axial direction of the shaft tube 11 made of a metal tube is V-shaped. It is formed by bending a part of. And the width | variety in the circumferential direction of the notch 12 and the square shaped locking hole 13 is formed equivalent to the space | interval of a pair of seating surfaces 14 and 14. FIG. And the length in the axial direction of this pair of seating surfaces 14 and 14 is formed substantially the same as the length of the front-end edge in the attachment plate 23 of the clip 21 mentioned later.

  As shown in FIGS. 1 to 3, a locking projection 16 that bulges from the inner periphery toward the inside of the cylinder is formed at the rear portion to which the tail crown 31 of the shaft cylinder 11 is attached. The locking projection 16 is formed in front of the notch 12 and between the pair of seating surfaces 14, 14 at the rear portion of the shaft cylinder 11 covered with a clip 21 described later. As shown in detail in FIG. 3, the locking projection 16 is formed of a cut piece cut out into the cylinder of the shaft cylinder 11 so that the front end edge 16 a is orthogonal to the axial direction. The swollen locking projection 16 is formed to be inclined so as to reduce the inner diameter of the shaft tube 11 from the rear to the front in order to facilitate insertion into a locked recess 34 described later.

  Returning to FIG. 1, the clip 21 includes a clip main body 22 provided along the shaft cylinder 11 and a pair of mounting plates 23 formed toward the shaft cylinder 11 from both sides in the width direction at the rear portion of the clip main body 22. Is provided. The clip 21 is made of metal, and a bulging portion 22 a that elastically contacts the outer surface of the shaft cylinder 11 is formed at the front portion of the clip main body 22. As shown in FIGS. 2 and 4, the rear portion of the clip body 22 is gently curved so as to cover the shaft cylinder 11 in the width direction, and both ends thereof are bent to form attachment plates 23 on both sides. As shown in FIG. 4, the front edges of the pair of mounting plates 23, 23 formed on both sides of the clip body 22 are seated on the pair of seating surfaces 14, 14 formed on the outer surface of the shaft cylinder 11. The gap is formed to be equal to the gap between the pair of seating surfaces 14 and 14.

  As shown in FIGS. 1 and 5, an attachment piece 24 and an auxiliary attachment piece 26 are formed at the tip of the attachment plate 23, respectively. The attachment piece 24 and the auxiliary attachment piece 26 are each formed in a hook shape that opens toward the front, the attachment piece 24 is formed at the front portion at the tip of the pair of attachment plates 23, 23, and the auxiliary attachment piece 26 is a pair of It is formed in the rear part in the front-end | tip of the attachment plates 23 and 23, respectively. Then, the mounting piece 24 is inserted into the locking hole 13 as shown by the one-dot chain line arrow in FIG. 1, and then the clip 21 is moved forward to be locked to the hole edge of the locking hole 13. When the clip 21 is moved rearward, the mounting piece 24 that is locked to is configured to be removable from the hole edge of the locking hole 13. On the other hand, the distance in the front-rear direction between the mounting piece 24 and the auxiliary mounting piece 26 is equal to the distance between the notch 12 and the locking hole 13, and the mounting piece 24 moved forward is locked to the hole edge of the locking hole 13. Thus, the auxiliary mounting piece 26 is configured to be locked to the notch 12. When the clip 21 is moved rearward to disengage the mounting piece 24 from the hole edge of the locking hole 13, the auxiliary mounting piece 26 is locked to the notch 12. The auxiliary mounting piece 26 is also configured to be detached from the notch 12.

  As shown in FIGS. 1, 3, and 5, the clip 21 includes a locking piece 27 formed at the rear end of the clip body 22. The locking piece 27 is formed by connecting the rear end edges of the pair of mounting plates 23 and 23 and bending the rear end of the clip body 22 so as to close the gap therebetween. Further, as shown in FIG. 5, in a state where the attachment piece 24 is engaged with the hole edge of the engagement hole 13 and the auxiliary attachment piece 26 is engaged with the notch 12, the engagement piece 27 is formed in the notch 12. It is configured to be fitted. The locking piece 27 is formed so that the rear surface thereof is flush with the rear end edge 11a (FIG. 1) of the shaft tube 11 in a state where the locking piece 27 is fitted into the notch 12.

  Returning to FIG. 1, the tail crown 31 attached to the rear portion of the shaft tube 11 includes an insertion portion 32 having a circular cross section inserted into the rear portion of the shaft tube 11 from the rear end of the shaft tube 11, and the insertion portion 32. A large-diameter portion 33 formed integrally with the insertion portion 32 is coaxially continuous with the insertion portion 32. As shown in FIG. 3, the large-diameter portion 33 in this embodiment has an outer diameter that is the same as the outer diameter at the rear portion of the shaft tube 11. That is, when the front end edge 33a of the large diameter portion 33 comes into contact with the rear end edge 11a of the shaft cylinder 11 in a state where the insertion portion 32 is inserted into the rear portion of the shaft cylinder 11, the outer periphery of the large diameter portion 33 is It is comprised so that it may continue smoothly with the outer periphery in the rear part. The front end edge 33 a of the large-diameter portion 33 that abuts the rear end edge 11 a of the shaft cylinder 11 abuts from behind on the locking piece 27 fitted in the notch 12, and the mounting piece 24 is connected to the locking hole 13. The auxiliary attachment piece 26 locked to the hole edge is configured to prohibit the backward movement of the clip 21 locked to the notch 12.

  On the other hand, the insertion recess 32 of the tail crown 31 is formed with a locked recess 34 into which the locking protrusion 16 is inserted while the large diameter portion 33 is in contact with the locking piece 27. This locked recess 34 is a groove formed in the outer periphery of the insertion portion 32 so that the front surface is orthogonal to the axial direction, and is inserted into the locking projection 16 as shown in FIG. Thus, the front surface 34a of the locked recess 34 is configured to come into contact with the front end edge 16a of the locking protrusion 16 made of a cut piece. The front surface 34 a of the locked recess 34 is in contact with the front end edge 16 a of the locking protrusion 16, thereby preventing the tail crown 31 from moving backward with respect to the shaft tube 11. Further, a guide groove 36 facing the seating surface 14 of the shaft tube 11 is formed in the insertion portion 32 of the tail crown 31 so as to extend in the axial direction. As shown in FIGS. 2 and 4, the guide groove 36 is formed in accordance with the cylinder inner surface shape of the seating surface 14 having a V-shaped cross section, and the guide groove 36 is formed in the notch 12. A slit 37 into which the locked auxiliary attachment piece 26 can enter is formed extending in the axial direction.

  The writing instrument in this embodiment is a composite writing instrument in which a plurality of writing shaft bodies are accommodated in the shaft cylinder 11, and as shown in FIG. 1, a cam (not shown) for selectively projecting and retracting the plurality of writing shaft bodies. An attachment portion 38 for attaching the cylinder so as not to rotate and to be movable in the axial direction is formed in the insertion portion 32 of the tail crown 31. The tail cap 31 in this embodiment is a resin molded product, and the large diameter portion 33, the insertion portion 32, and the attachment portion 38 are integrally formed at the time of molding. The tail cap 31 is formed with a through hole 39 that penetrates the large diameter portion 33 and the insertion portion 32. The through hole 39 is provided with a knock member that enables knocking of a writing shaft that is projected by a cam cylinder (not shown). The structure of the plurality of writing shafts, cam cylinder, and knocking member (not shown) is conventionally known. Since it is the same as a well-known thing, description here is abbreviate | omitted.

  In the clip mounting structure of the writing instrument thus configured, the mounting piece 24 of the clip 21 is inserted into the locking hole 13, the auxiliary mounting piece 26 is positioned behind the notch 12, and then the clip 21 is moved forward. As a result, the mounting piece 24 is locked to the edge of the locking hole 13, and at the same time, the auxiliary mounting piece 26 is locked to the notch 12. When the clip 21 is thus attached to the shaft cylinder 11, the locking piece 27 in the clip 21 is fitted into the notch 12. Thereafter, the tail cap 31 is inserted into the shaft cylinder 11 from behind. When the insertion portion 22 of the tail crown 21 is inserted into the rear portion of the shaft tube 11 from the rear end, the locking projection 16 is inserted into the locked recess 34 and locked, whereby the tail crown 31 is attached to the shaft tube 11. It is done. When the tail cap 31 is attached to the shaft tube 11, the large-diameter portion 33 of the tail crown 31 comes into contact with the locking piece 27 fitted in the notch 12, and the rearward movement of the clip 21 is prohibited. The clip 21 is fixed to the shaft cylinder 11. Therefore, the clip 21 can be fixed to the shaft tube 11 by a relatively simple operation of inserting the insertion portion 22 of the tail cap 21 into the rear portion of the shaft tube 11.

  Further, the shaft cylinder 11 is made of metal, and the locking projection 16 is formed by a cut piece cut out into the cylinder so that the front end edge 16a is orthogonal to the axial direction. 16 is formed so as to be inclined so that the inner diameter of the shaft cylinder 11 is reduced from the rear to the front, so that when the insertion portion 22 of the tail cap 21 is inserted into the rear portion of the shaft cylinder 11, the locking protrusion 16 or the tail Since the insertion portion 22 of the crown 21 is elastically deformed according to the inclination of the locking protrusion 16, the insertion operation can be performed relatively easily. Then, when the locking projection 16 is inserted into the locked recess 34, the front surface 34 a of the locked recess 34 comes into contact with the front edge of the locking projection 16 and is locked. However, it is extremely difficult to disengage the tail crown 31 inserted into the locked recess 34 from the shaft cylinder 11. As a result, the clip 21 can be firmly fixed by the shaft cylinder 11.

  Further, since the front surface 34a of the locked recess 34 comes into contact with the front end edge of the locking projection 16 when the locking projection 16 is inserted into the locked recess 34, the tail crown 21 is placed on the rear portion of the shaft tube 11. A moderation feeling can be given to inserting and locking the locking projection 16 to the locked recess 34, and the locking projection 16 is not locked to the locked recess 34. The state in which the locking projection 16 is locked in the locked recess 34 can be clearly distinguished.

  Further, since the locking projection 16 is formed in the rear part of the shaft cylinder 11 which is in front of the notch 12 and is covered with the clip 21, the shaft of the locking projection 16 made of a cut piece cut out into the cylinder. The dent generated on the outer surface of the cylinder 11 can be covered with the clip 21. For this reason, the dent of the outer surface resulting from the latching protrusion 16 is not visually recognized from the outside, and the clip 21 can be firmly attached to the shaft tube 11 without deteriorating the appearance.

  Further, since the seat surface 14 formed to extend forward from the rear end of the shaft tube 11 and on which the tip edge of the mounting plate 23 is seated is formed on the outer surface of the shaft tube 11, this seat is used when the clip 21 is attached to the shaft tube 11. By attaching the mounting plate 23 to the seating surface 14 using the surface 14 as a mark, the mounting piece 24 formed at the tip of the mounting plate 23 can be inserted into the locking hole 13 of the shaft cylinder 11, and the mounting Work can be further facilitated. In addition, since the tip edge of the mounting plate 23 abuts against the seat surface 14 in a state where the mounting piece 24 is locked to the hole edge of the locking hole 13, the stability of the clip 21 attached to the shaft cylinder 11 is sufficiently ensured. can do. Then, when the insertion portion 22 of the tail cap 21 is inserted into the shaft cylinder 11, as shown by a one-dot chain line in FIG. 2, the V of the seat surface 14 formed by bending the outer periphery of the shaft cylinder 11 into a V-shaped cross section. The locking protrusion 16 can be pulled away from the outer surface of the insertion portion 22 by being elastically deformed so that the letter-shaped cross-sectional shape is extended. For this reason, the operation | work which inserts the insertion part 22 of the tail cap 21 in the axial cylinder 11 can be further facilitated.

  Further, since the guide groove 36 facing the seat surface 14 is formed to extend in the axial direction on the outer periphery of the insertion portion 32, when the tail cap 31 is inserted into the shaft tube 11, the guide groove 36 is used as a mark. By inserting the insertion portion 22 into the shaft cylinder 11 so that 36 is aligned with the seating surface 14, the tail crown 31 can be attached relatively easily. Since the auxiliary attachment piece 26 that moves forward and engages with the notch 12 while the attachment piece 24 is engaged with the hole edge of the engagement hole 13 is formed on the attachment plate 23, The mounting piece 24 formed at the front part is locked to the hole edge of the locking hole 13 of the shaft cylinder 11, and the auxiliary mounting piece 26 formed at the rear part at the tip of the mounting plate 23 is notched 12 on the shaft cylinder 11. The clip 21 can be attached to the shaft tube 11 by being engaged with the shaft cylinder 11. For this reason, the latching location with respect to the axial cylinder 11 of the clip 21 can be increased, and thereby the stability of the clip 21 attached to the axial cylinder 11 can be sufficiently ensured.

  In the above-described embodiment, an example in which the auxiliary mounting piece 26 to be locked to the notch 12 is formed at the rear portion at the tip of the mounting plate 23 is shown. The auxiliary attachment piece 26 may be formed on the locking piece 27 as long as it can be locked to the notch 12 while being locked to the hole edge. Thus, even if the auxiliary mounting piece 26 is formed on the locking piece 27, the number of locking positions of the clip 21 with respect to the shaft tube 11 can be increased, and the stability of the clip 21 mounted on the shaft tube 11 is sufficient. Can be secured.

It is a disassembled perspective view which shows the attachment structure of the tail crown 31 for writing instruments of this invention embodiment. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Shaft cylinder 12 Notch 13 Locking hole 14 Seat surface 16 Locking protrusion 16a Front edge 21 Clip 22 Clip main body 23 Mounting plate 24 Mounting piece 26 Auxiliary mounting piece 27 Locking piece 31 Tail crown 32 Insertion part 33 Large diameter part 34 Recessed recess 34a Front

Claims (7)

A shaft cylinder having a notch formed at the rear end and a locking hole formed at the front of the notch in the axial direction, a clip main body provided along the shaft cylinder, and a rear portion of the clip main body. An attachment piece that moves forward, engages with the hole edge of the engagement hole, moves backward, and disengages from the edge of the engagement hole; and the attachment piece provided at the rear end of the clip body A clip having a locking piece fitted into the notch in a state of being locked to a hole edge of the hole, an insertion portion inserted into a rear portion of the shaft cylinder, and a rear portion of the insertion portion, and In a clip mounting structure of a writing instrument comprising a tail cap having a large diameter portion that abuts on the locking piece in a state of being inserted into a shaft cylinder and prohibits the backward movement of the clip,
A locking projection that bulges from the inner periphery toward the inside of the cylinder is formed at the rear part of the shaft cylinder,
A clip mounting structure for a writing instrument, wherein a locking recess to which the locking projection is locked in a state where the large diameter portion is in contact with the locking piece is formed in the insertion portion.   The shaft tube is made of metal, and the locking projection is made of a cut piece obtained by cutting the shaft tube into the tube so that the front end edge is orthogonal to the axial direction, and the locking protrusion made of the cut piece is It is formed to be inclined so as to reduce the inner diameter of the shaft tube from the rear to the front, and the locked recess is formed to extend in the circumferential direction on the outer periphery of the insertion portion so that the front surface is orthogonal to the axial direction. 2. The clip mounting structure for a writing instrument according to claim 1, wherein the clip is attached to a front end edge of the locking projection when the locking projection is in a grooved state.   The clip mounting structure for a writing instrument according to claim 2, wherein a locking projection is formed at a rear portion of the shaft cylinder which is in front of the notch and is covered with the clip.   A mounting plate whose leading edge contacts the outer surface of the shaft cylinder is formed from both sides in the width direction of the rear portion of the clip body toward the shaft cylinder, and a seating surface on which the leading edge of the mounting plate is seated is a rear end of the shaft cylinder The clip mounting structure for a writing instrument according to any one of claims 1 to 3, wherein the clip mounting structure is further extended forward and formed on an outer surface of the shaft cylinder.   The clip mounting structure for a writing instrument according to claim 4, wherein the seating surface is formed by bending the outer periphery of the shaft tube into a V-shaped cross section.   6. The clip mounting structure for a writing instrument according to claim 5, wherein a guide groove facing the seating surface is formed on the outer periphery of the insertion portion so as to extend in the axial direction.   A mounting piece is formed at the front part of the front end of the mounting plate, and an auxiliary mounting piece that locks in the notch in a state where the clip moves forward and the mounting piece is locked to the edge of the locking hole is the front end of the mounting plate. The clip mounting structure for a writing instrument according to any one of claims 4 to 6, wherein the clip mounting structure is formed on a rear portion or a locking piece.

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