JP2014091228A - Clip attachment structure, and writing instrument provided with clip using the clip attachment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that the fixation of a clip is insufficient when attaching the clip to a cylindrical member by snapping engagement, and the clip is easily slipped off in the fore-and-aft direction or in the right and left direction of the cylindrical member, resulting in a risk of the clip to often come off.SOLUTION: A clip attachment structure is configured such that a base of a clip is engaged with an attachment part projectingly installed on an outer surface of a shaft cylinder. The clip attachment structure is characterized by: forming the opposing two side walls in the clip and forming engagement pieces projected toward the axial direction of the clip in each side wall; also forming two protrusions in each face of the axial direction side of the clip in each engagement piece and forming the two protrusions in the vicinity of both ends of the end face of the engagement piece; and forming locking groove parts at both side faces in the attachment part of the shaft cylinder, and engaging the engagement piece of the clip with the locking groove parts of the attachment part.

Description

  The present invention relates to a clip mounting structure and a writing instrument provided with a clip by the clip mounting structure.

  Conventionally, various configurations are known as attachment structures for clips in writing instruments. One of them is a clip mounting structure described in Patent Document 1. In Patent Document 1, a cylindrical body (shaft cylinder) is provided with a locking portion formed by a pair of sections and a pair of grooves formed between the section and the cylindrical body on the outer peripheral portion of the cylindrical body. On the other hand, the clip has a pair of bent portions at its base. Then, the clip is fixed to the cylinder by elastically engaging the bent portion with the section of the shaft cylinder.

Japanese Utility Model Publication No. 01-018387

  In the mounting structure described in Patent Document 1, locking at the locking portion of the cylindrical body has two roles of mounting the clip and preventing displacement in the left and right (side of the cylindrical body) direction. However, in order to ensure the prevention of the shift in the left-right direction, the length of the locking portion and the bent portion of the clip must be sufficiently long in the longitudinal direction of the shaft cylinder, It is difficult to suppress the deviation, and there is a possibility that the clip may come off.

The present invention is a clip mounting structure in which a base portion of a clip is engaged with a mounting portion projecting from an outer surface of a shaft cylinder, and two opposing side walls are formed on the clip. Engagement pieces projecting in the axial direction of the clip are formed on the side wall, and two protrusions are formed on the end surface portion on the axial direction side of the clip on each engagement piece. Convex portions are formed in the vicinity of both ends of the end surface portion of the engagement piece, while an attachment groove portion is formed on both side surfaces of the attachment portion of the shaft tube, and the engagement piece of the clip is attached to the attachment portion. The clip is formed by engaging the engaging groove with the first gist and engaging the base portion of the clip with the mounting portion protruding from the outer surface of the shaft tube. Forming one side wall and each side wall in the axial direction of the clip The projecting engagement pieces are formed, and the engagement pieces are formed at different positions in the longitudinal direction of the clip. On the other hand, the mounting portion of the shaft tube is formed with locking grooves on both side surfaces thereof. Then, the second gist is that the engaging piece of the clip is engaged with the locking groove portion of the attaching portion, and the base portion of the clip is engaged with the attaching portion protruding from the outer surface of the shaft tube. The clip is formed with two opposing side walls, and each side wall is formed with two engaging pieces projecting in the axial direction of the clip. The angle of the end surface portion on the axial direction side of the shaft tube is made different. On the other hand, the mounting portion of the shaft tube is formed with locking groove portions on both side surfaces thereof, and the engaging piece of the clip is used as the locking groove portion of the mounting portion. The third gist is that they are engaged, and the base of the clip is A clip formed by engaging a mounting portion projecting on a surface, wherein the clip has two opposing side walls, and each side wall protrudes in the axial direction of the clip. A piece is formed, and an end surface portion on the axial direction side of the clip of the engagement piece is formed by folding back to the side wall side. On the other hand, a locking groove portion is formed on both side surfaces of the mounting portion of the shaft tube. The fourth aspect is that the engaging piece of the clip is engaged with the engaging groove portion of the attaching portion, and the base portion of the clip is engaged with the attaching portion protruding from the outer surface of the shaft cylinder. The clip is formed with two opposing side walls, and each side wall is formed with an engagement piece projecting in the axial direction of the clip, and a part of the side wall is formed. A crimped portion is formed by cutting out, while the shaft tube is removed. The attaching portion is formed with locking groove portions on both side surfaces thereof, the engagement piece of the clip is engaged with the locking groove portion of the mounting portion, and the crimping portion is bitten into the locking groove portion. This is the fifth gist.

The present invention is a clip mounting structure in which a base portion of a clip is engaged with a mounting portion projecting from an outer surface of a shaft cylinder, and two opposing side walls are formed on the clip. Engagement pieces projecting in the axial direction of the clip are formed on the side wall, and two protrusions are formed on the end surface portion on the axial direction side of the clip on each engagement piece. Convex portions are formed in the vicinity of both ends of the end surface portion of the engagement piece, while an attachment groove portion is formed on both side surfaces of the attachment portion of the shaft tube, and the engagement piece of the clip is attached to the attachment portion. The clip is formed by engaging the engaging groove with the first gist and engaging the base portion of the clip with the mounting portion protruding from the outer surface of the shaft tube. Forming one side wall and each side wall in the axial direction of the clip The projecting engagement pieces are formed, and the engagement pieces are formed at different positions in the longitudinal direction of the clip. On the other hand, the mounting portion of the shaft tube is formed with locking grooves on both side surfaces thereof. Then, the second gist is that the engaging piece of the clip is engaged with the locking groove portion of the attaching portion, and the base portion of the clip is engaged with the attaching portion protruding from the outer surface of the shaft tube. The clip is formed with two opposing side walls, and each side wall is formed with two engaging pieces projecting in the axial direction of the clip. The angle of the end surface portion on the axial direction side of the shaft tube is made different. On the other hand, the mounting portion of the shaft tube is formed with locking groove portions on both side surfaces thereof, and the engaging piece of the clip is formed on the locking groove portion of the mounting portion The third gist is that they are engaged, and the base of the clip is A clip formed by engaging a mounting portion projecting on a surface, wherein the clip has two opposing side walls, and each side wall protrudes in the axial direction of the clip. A piece is formed, and an end surface portion on the axial direction side of the clip of the engagement piece is formed by folding back to the side wall side. On the other hand, a locking groove portion is formed on both side surfaces of the mounting portion of the shaft tube. The fourth aspect is that the engaging piece of the clip is engaged with the engaging groove portion of the attaching portion, and the base portion of the clip is engaged with the attaching portion protruding from the outer surface of the shaft cylinder. The clip is formed with two opposing side walls, and each side wall is formed with an engagement piece projecting in the axial direction of the clip, and a part of the side wall is formed. A crimped portion is formed by cutting out, while the shaft tube is removed. The attaching portion is formed with locking groove portions on both side surfaces thereof, the engagement piece of the clip is engaged with the locking groove portion of the mounting portion, and the crimping portion is bitten into the locking groove portion. Since it was set as the 5th summary, it can suppress that a clip shifts to the left-right direction, and can be securely attached to a shaft cylinder.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the whole mechanical pencil of 1st Example. It is an external view at the time of rotating 90 degree | times to the circumferential direction from the state of FIG. It is a longitudinal cross-sectional view in the state of FIG. FIG. 4 is an enlarged view around a tip member 2 in FIG. 3. FIG. 4 is an enlarged view around a rear shaft 4 in FIG. 3. It is the OO line sectional drawing in FIG. It is a perspective view of the eraser guide member 17 in the first embodiment. It is an expansion perspective view of the attachment part 4c vicinity of the rear axis | shaft 4 in 1st Example. It is an external view (side view) of the clip 19 in 1st Example. It is the figure which looked at the clip 19 in 1st Example from the back side. It is a perspective view of the clip 19 in 1st Example. It is an expansion perspective view of the attachment part 4c vicinity at the time of clip mounting | wearing in 1st Example. It is the NN sectional view taken on the line in FIG. It is the figure which looked at the clip 19 in 2nd Example from the back side. It is a perspective view (enlarged view) of the clip 19 in 2nd Example. It is the external appearance back enlarged view of the mechanical pencil of 2nd Example. It is the PP sectional view taken on the line in FIG. It is the figure which looked at the clip 19 in 3rd Example from the back side. It is a perspective view (enlarged view) of the clip 19 in 3rd Example. It is the QQ sectional view taken on the line in FIG. It is the external appearance back enlarged view of the mechanical pencil of 3rd Example. It is the RR sectional view taken on the line in FIG. It is the SS sectional view taken on the line in FIG. It is the figure which looked at the clip 19 in 4th Example from the back side. It is a perspective view (enlarged view) of the clip 19 in 4th Example. It is the TT sectional view taken on the line in FIG. It is the external appearance back enlarged view of the mechanical pencil of 4th Example. FIG. 28 is a cross-sectional view taken along the line U-U in FIG. 27. It is the VV sectional view taken on the line in FIG. It is the figure which looked at the clip 19 in 5th Example from the back side. It is a perspective view (enlarged view) of the clip 19 in 5th Example. It is the WW sectional view taken on the line in FIG. It is the external appearance back enlarged view of the mechanical pencil of 5th Example. It is XX sectional drawing in FIG. It is the figure which looked at the clip 19 in 6th Example from the right side surface side. It is a perspective view (enlarged view) of the clip 19 in 6th Example. It is the external appearance back enlarged view of the mechanical pencil of 6th Example. It is the ZZ sectional view taken on the line in FIG. It is the YY sectional view taken on the line in FIG.

A first embodiment of the present invention will be described with reference to FIGS. Hereinafter, in the overall view of the mechanical pencil, a later-described front member 2 side is referred to as the front, and the eraser 16 side is referred to as the rear.
In this embodiment, a mechanical pencil will be described as an example. However, the present invention is not limited to a mechanical pencil, and any writing instrument having a clip, such as a ballpoint pen, a marking pen, or a fountain pen, may be used.

  A shaft cylinder 1 of the present embodiment includes a front member 2, a front shaft 3 that is screwed to the rear end of the front member 2, and a rear shaft 4 that is fitted to cover the rear portion of the front shaft 3. It consists of and. An inner shaft set 5 having a core feeding mechanism is disposed inside the shaft cylinder 1, which will be described later. The inner shaft set 5 is sandwiched between the tip member 2 and the front shaft 3, so that the shaft It is positioned in the cylinder 1.

A stainless steel pipe 6 is press-fitted and fixed in front of the tip member 2, and a slider 8 having a core holding portion 7 integrally formed therein is press-fitted and fixed inside the tip member 2.
A female screw portion 2a is formed on the rear inner surface of the tip member 2, and can be screwed to a male screw portion 3a of the front shaft 3 described later.

A reduced diameter portion (gripping portion) 3b is formed in front of the front shaft 3, and a cylindrical holding member 20 made of a thermoplastic elastomer, silicone, or the like is attached to the reduced diameter portion (gripping portion) 3b. ing. A plurality of protrusions 20a are formed on the gripping member 20 in a circumferential shape, and the overall appearance is a gentle arc shape. The vertical cross-sectional shape of the plurality of protrusions 20a is formed in a trapezoidal shape whose diameter is reduced toward the outside of the shaft tube. On the other hand, the base 20b of the protrusion 20a is thin at the front, thick near the middle, and formed slightly thinner toward the rear. The portion where the thickness of the base portion 20b of the protrusion 20a is the thickest and the portion where the overall appearance is most prominent are substantially the same. In this embodiment, the shaft cylinder 1 is made of polycarbonate (PC). However, the present invention is not limited to this, and the shaft cylinder 1 can be formed of any material.
Further, a most reduced diameter portion 3c having an outer diameter smaller than that of the reduced diameter portion is formed further forward than the reduced diameter portion 3b of the front shaft 3, and a male screw is formed on the outer surface of the most reduced diameter portion 3c. Part 3a is formed.
And the convex part 3d is formed in the rear-end outer periphery of the front axis | shaft 3, and the polygonal part 3e (10 squares) is formed in the rear part inner surface of the front axis | shaft 3. FIG. In the present embodiment, the front shaft 3 is formed from a resin molded product, but the thickness of the portion of the convex portion 3d where the parting line (PL) formed by molding is formed is thinned. (D cut). When the lead L is fed out, the rear shaft 4 moves back and forth with respect to the front shaft 3, and when the eraser 16 is fed out, the rear shaft 4 rotates with respect to the front shaft 3. However, at this time, there is a possibility that the movement may be deteriorated by the burr of the parting line formed on the convex portion 3d of the front shaft 3. By performing the D cut on the parting line forming portion of the convex portion 3d, the malfunction can be prevented, and the lead and the eraser can be fed out satisfactorily.

The central shaft set 5 has a lead tank 9 for storing a lead, and a chuck body 10 for holding and releasing the lead L is fixed to the front end of the lead tank 9. A chuck ring 11 that opens and closes the chuck body 10 is disposed on the chuck body 10 in an enclosed state. Further, a core 12 is disposed so as to enclose the chuck body 10, the chuck ring 11, and the front of the core tank 9. An inner flange portion 13 is formed on the inner diameter portion of the core 12, and an elastic member (coil spring) 14 is provided between the rear end surface 13 a of the inner flange portion 13 and the front end surface 9 a of the core tank 9. Is stretched. The front end of the outer peripheral portion of the core 12 is an outer flange portion 15, and a rear end surface 11 b of the flange portion 11 a formed at the front end of the outer peripheral portion of the chuck ring 11 is formed on the front end surface 15 a of the outer flange portion 15. Abut. That is, the core 12 is held between the chuck ring 11 and the elastic member 14. The middle shaft set 5 is configured as described above. The elastic member 14 urges the chuck body 10 and the core tank 9 to the rear of the shaft cylinder 1 when the middle shaft set 5 is disposed in the shaft cylinder 1.
Here, the structure regarding the positioning in the shaft cylinder 1 of the center shaft set 5 is described (FIG. 4). The outer core 15 of the core 12 is sandwiched between an inner step 2b formed inside the front member 2 and a front end surface 3f of the front shaft 3, and the front member 2 and the front shaft 3 Are screwed together, and the core 12, and thus the middle shaft set 5, is positioned and arranged in the shaft tube 1. That is, the female screw portion 2a of the tip member 2 and the male screw portion 3a of the front shaft 3 are connected to the tip member 2, the outer flange portion 15 of the core 12, and the outer flange portion 15 of the core 12 to the front. The middle shaft set 5 is fixed in the shaft tube 1 by screwing until the shaft 3 comes into contact. Four protrusions (not shown) are formed at equal intervals on the rear end surface 15b of the outer flange portion 15 of the core 12. These protrusions (not shown) are elastically deformable protrusions and are crushed by the holding force between the front member 2 and the front shaft 3, thereby causing dimensional variations in the longitudinal direction of the central shaft set 5. Absorbs. The protrusion on the rear end surface 15b of the outer flange portion 15 of the core 12 is not elastically deformed, but the protrusion on the core 12 is harder than the front shaft 3, and the front end surface of the front shaft 3 with which the protrusion contacts. Even in the configuration in which 3f is deformed into the shape of the protrusion, it is possible to absorb the dimensional variation in the longitudinal direction of the middle shaft set 5.
Here, although the taper is applied from the front to the rear inside the front shaft 3, the inner diameter portion in the vicinity of the front end is a straight portion 3g. On the other hand, the rear portion of the outer flange portion 15 of the core 12 substantially corresponding to the straight portion 3g of the front shaft 3 is also a straight portion 12a. By forming in this way, when the middle shaft set 5 is arranged and fixed in the shaft cylinder 1, the center axes of the middle shaft set 5 and the shaft cylinder 1 are aligned with each other, so that the core can be fed out satisfactorily.
The rear end surface 9b of the lead tank 9 abuts against a wall portion 17d formed inside an eraser guide member 17 described later.

At the rear of the rear shaft 4, a rotary feeding mechanism in which a long eraser 16 appears and disappears is detachably attached. Hereinafter, the rotation feeding mechanism will be described (FIGS. 5 to 7). A spiral groove 4a is formed on the inner surface of the rear shaft 4, and as will be described later, the eraser guide member 17 is attached to the rear shaft 4 so as to be unable to move back and forth while being rotatable. The eraser guide member 17 has a guide groove 17a formed at an opposing position, and an eraser receiver 18 and a long eraser 16 are provided therein. A leg portion 18a is formed on the eraser receiver 18, and the leg portion 18a is fitted in the guide groove 17a. Further, a protrusion 18b is formed on the leg 18a, and the protrusion 18b is screwed into the spiral groove 4a. That is, the rear shaft 4 and the eraser receiver 18 are in a relationship of a female screw and a male screw. The eraser guide member 17 has a front portion extending, and a cross-sectional shape of the extension portion 17b is a decagonal shape. It may be. On the other hand, as described above, the polygonal portion 3e (10 corners) is also formed on the inner surface of the rear portion of the front shaft 3. That is, the eraser guide member 17 can be attached to and detached from the front shaft 3 but is non-rotatably engaged (FIG. 3). Needless to say, if the extending portion 17b is elliptical, the inner surface of the front shaft 3 is also elliptical. Further, a slight gap 17 c is formed between the inner surface of the extended portion 17 b and the outer surface of the core tank 9 of the central shaft set 5. On the rear side of the extended portion 17b, a pair of outer cutouts 17e formed by biting and having a convex outward, and a pair of inwardly located in front and convex inward A cut piece 17f is formed. The pair of outer cut pieces 17e is formed with an enlarged diameter portion 17g on the rear end side, and a rear end surface 17h of the enlarged diameter portion 17g abuts on the stepped portion 4j inside the rear shaft 4. An outer flange portion 17i is formed at the rear end of the eraser guide member 17, and the front end surface 17j of the outer flange portion 17i and the rear end surface 4k of the rear shaft 4 are in contact with each other. The eraser guide member 17 is fitted to the rear shaft 4 by the outer flange portion 17i and the outer cut-out piece 17e, so that it can rotate with respect to the rear shaft 4, but cannot move back and forth. It is attached. On the other hand, an inner convex portion 17k is formed on the rear inner surface of the pair of inner cut pieces 17f. The inner convex portion 17k is in pressure contact with the outer surface of the core tank 9, and the core tank 9 is fixed. I do.
Further, ribs 4b (not shown) are provided at three equal intervals on the front inner surface of the rear shaft 4. The rib 4b (not shown) is engaged with the convex portion 3d of the front shaft 3, thereby preventing the front shaft 3 and the rear shaft 4 from coming off. For example, when removing a clip, which will be described later, from a state of being inserted into the pocket, the gripping member 20 becomes a resistance and only the rear shaft 4 does not come out, and the writing instrument can be reliably removed from the pocket.
Further, a mounting portion 4c is provided protruding from the rear outer surface of the rear shaft 4, and a clip 19 is attached to the mounting portion 4c.
The front end of the rear shaft 4 is formed to be inclined with respect to the axial direction of the shaft tube 1. Further, an uneven portion inclined in the axial direction of the shaft tube 1 is formed on the rear outer surface of the rear shaft 4 as the decorative portion 4d.

  Next, the feeding of the lead L will be described. When feeding the lead L, the rear end of the rear shaft 4 is pressed. By this pressing operation, the eraser receiving member 18 moves forward, the lead tank 9 disposed in front of the eraser receiving member 18 and abutting against the wall portion 17d of the eraser receiving member 18 moves forward, and the chuck body 10 also moves forward. At this time, the lead L is also moved forward, the flange portion 11a of the chuck ring 11 comes into contact with the stepped portion 2c provided inside the tip member 2, and the chuck body 10 is expanded. And even after the chuck body 10 is expanded, the forward movement of the chuck body 10 is performed. When the pressing operation of the rear shaft 4 is released here, the lead tank 9 and the chuck body 10 are retracted, the chuck body 10 is closed by the chuck ring 11, and the lead L is gripped again. This completes the lead L feeding operation.

  Furthermore, the operation of the eraser will be described. The front shaft 3 is gripped with one hand, and the rear shaft 4 is gripped with the other hand and rotated relatively. By this rotation operation, the eraser receiver 18 is raised or lowered, and the eraser 16 protrudes / immerses from the rear end of the rear shaft 4 accordingly. At this time, since the eraser guide member 17 is engaged with the front shaft 3 at the polygonal portion, even if the eraser guide member 17 and the core tank 9 are press-fitted with a light force, The rotating action does not act on the lead tank 9.

Here, the attachment structure of the clip 19 in a present Example is explained in full detail (FIGS. 8-13).
As described above, on the rear outer surface of the rear shaft 4, the clip mounting portion 4 c protrudes (FIG. 8). The attachment portion 4c is formed with a thick portion 4e having a high front in the longitudinal section, and a rear portion of the attachment portion 4c is formed as an inclined portion that gradually becomes thinner. And the locking groove part 4f is formed in the both sides | surfaces of this thick part 4e, and the processus | protrusion 4g is formed in the middle vicinity of this locking groove part 4f. Since the locking groove 4f is formed, the cross section of the thick portion 4e is formed in a substantially T shape. Further, the width in front of the thick portion 4e is formed to be slightly smaller than the width of the clip 19 described later. And the rear-end surface of the said attachment part 4c is formed along the inner surface shape of the clip 19 (rear-end wall 4h), and the width | variety is narrowed toward the back. The width of the mounting portion 4c from the locking groove portion 4f to the front end wall 4h is formed substantially equal to the width of the mounting portion 4c where the locking groove portion 4f is formed.
On the other hand, the base 19b of the clip 19 is formed in a box shape including a rear wall 19a of the clip 19 and two side walls 19c facing each other (FIGS. 9 to 11). Each side wall 19c is formed with an engaging piece 19d projecting in the axial direction of the clip, and the end face (end surface portion 19h) of each engaging piece 19d on the axial direction side of the clip has an uneven portion. 19e is formed symmetrically with the opposing engagement piece 19d. Here, the left and right are the left and right with respect to the axis of the clip 19. In each engagement piece 19d, a concave portion 19i is provided in the center of the end surface (end surface portion 19h) on the axial direction side of the clip. That is, two protruding in the axial direction are provided at the front and rear of the concave portion 19i. A convex portion 19j is provided. The concave and convex portions 19e are constituted by the concave portions 19i and the two convex portions 19j. The projections 19j in each engagement piece 19d are formed in the vicinity of the front end and the rear end of the end surface portion 19h of the engagement piece 19d, and are formed so that the distance between the projections 19j is the largest. Yes. Each of the convex portions 19j has a substantially wedge shape with a tip pointed toward the axial direction. However, the shape of the convex portion 19j is not limited to the substantially wedge shape, and may be a quadrangular shape or an arbitrary shape. Incidentally, two concave portions 19f are formed on the upper surface of the clip 19 to improve the aesthetic effect. Further, a ball portion 19g that is in contact with the surface of the rear shaft 4 and serves as a clamping portion is integrally formed on the front inner surface of the clip 19, but it may be formed of a separate member and fixed to the clip 19. Furthermore, although the clip 19 in the present embodiment is made of metal, it may be a transparent or opaque resin, and can be appropriately selected as long as it has a shape and material that can be used.

  When attaching the clip 19 to the rear shaft 4, first, the clip 19 is perpendicular to the rear shaft 4 so that the engagement piece 19 d of the clip is positioned in front of the rear end wall 4 h of the attachment portion 4 c. The clip 19 is brought into contact. After that, the clip 19 is moved forward with respect to the rear shaft 4, and the clip 19 is moved until the front end surface of the engagement piece 19d of the clip 19 comes into contact with the front end wall 4i of the locking groove portion 4f of the mounting portion. Let The engagement piece 19d of the clip 19 engages with the locking groove 4f of the attachment portion 4c, and the rear wall 19a of the clip 19 and the rear end wall 4h of the attachment portion 4c come into contact with each other. It is attached to the rear shaft 4 (FIG. 12). At this time, the two convex portions 19j formed on the two engaging pieces 19d facing each other of the clip 19 bite into the respective locking groove portions 4f (FIG. 13).

  In the present embodiment, as described above, when the clip 19 is attached to the shaft tube 1, each engagement piece 19d of the clip 19 engages with each locking groove 4f of the attachment portion 4c, The two convex portions 19j formed on the two engaging pieces 19d facing each other of the clip 19 bite into the respective locking groove portions 4f (FIG. 13). At this time, as described above, the distance between the two convex portions 19j of each engaging piece 19d of the clip 19 is formed to be the maximum. If the distance between the two convex portions 19j is reduced, the rotation moment generated when the clip is shifted to the left and right becomes the center of rotation and the clip is likely to rotate. As a result, the right and left shift of the clip occurs. However, since the present embodiment is configured as described above, it is on the left and right diagonals with respect to the rotational moment applied to the end surface portion 19h of the engagement piece 19d that is generated when the clip is shifted to the left and right. The convex portions 19j serve as fulcrums. And since the protrusion 19j arrange | positioned on a diagonal can stretch and can prevent rotation, the shift | offset | difference to the left-right direction of the clip 19 can be prevented reliably, and the clip 19 can be reliably attached to a shaft cylinder. .

Further, in the present embodiment, since the shape of the two convex portions 19j of each engagement piece 19d of the clip 19 is a substantially wedge shape with a sharp tip, the engagement piece is bitten by the locking groove portion. A wedge effect is obtained.
Further, in this embodiment, when the clip 19 is attached to the shaft cylinder 1, the engagement piece 19d of the clip 19 engages with the locking groove 4f of the attachment portion 4c, and the rear of the clip 19 The inner surface of the wall 19a is in contact with the rear end wall 4h of the mounting portion 4c of the shaft cylinder 1. For this reason, there is also an advantage that attachment of the clip to the shaft cylinder becomes stronger when a sandwiched object having a relatively large thickness is inserted or when a force in the left-right direction is applied to the clip.

Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is an example in which the engaging pieces formed on the opposing side walls of the clip are formed at positions slightly deviated back and forth on the left and right. In the following, description of the same configuration as in the first embodiment is omitted.
Also in the present embodiment, the two side walls 19c of the clip 19 are respectively formed with engaging pieces 19k protruding in the axial direction of the clip, and formed on the two side walls 19c opposed to the clip 19. Each engaging piece 19k is formed at a position slightly shifted from front to back in the left and right directions. Also in this embodiment, each engaging piece 19k is formed with a concave and convex portion 19n including a concave portion 19l and two convex portions 19m, and each convex portion 19m is gently from the front end side to the rear end side. It rises on an inclined surface (inclined surface portion 19v), and a rear portion of the inclined surface portion 19v is formed by a straight portion 19w substantially parallel to the locking groove portion 4f, and a rear end of the straight portion 19w is formed perpendicular to the straight portion 19w. (Vertical portion 19x), and the whole has a substantially arrow shape.
In the present embodiment, as described above, the rotation that occurs when the clip 19 shifts to the left and right by forming the opposing engagement pieces 19k in the front and rear direction, that is, in a position shifted in the longitudinal direction of the shaft cylinder. Of the moments, the fulcrum is deviated with respect to a rotational moment in one direction (left rotational direction), and therefore, deviation due to rotation in the left rotational direction can be suppressed. If the engagement piece is formed in a bilaterally symmetric position as in the prior art, the fulcrum when the engagement piece formed bilaterally receives a force in the left and right rotational directions at the locking groove. Therefore, there is a problem that it rotates easily. In this respect, in this embodiment, since rotation in the left rotation direction can be prevented, rotation in one direction (left rotation direction) is prevented even if a force is applied to the clip 19 left and right. As a result, the clip can be reliably prevented from shifting in the left-right direction, and the clip 19 can be securely attached to the shaft tube. If the left and right engagement pieces 19k are displaced backward and forward as in this embodiment, the rotation in the right rotation direction is suppressed, and as a result, the clip can be prevented from shifting in the left and right direction, It can be securely attached to the barrel. That is, it is only necessary that the rotation of the clip to the left or right is reliably suppressed, and as a result, the clip can be securely attached to the shaft cylinder.
Further, as in the first embodiment, as a configuration of this embodiment, when the clip 19 is attached to the shaft tube 1, the engaging piece 19k of the clip 19 is engaged with the locking groove 4f of the attaching portion 4c. In addition, the inner surface of the rear wall 19a of the clip 19 is in contact with the rear end wall 4h of the mounting portion 4c of the shaft cylinder 1. For this reason, there is also an advantage that attachment of the clip to the shaft cylinder becomes stronger when a sandwiched object having a relatively large thickness is inserted or when a force in the left-right direction is applied to the clip.
Moreover, in the convex part 19m of the said engagement piece 19k of a present Example, although the shape is formed in the substantially arrow shape, the clip 19 is engaged with the axial cylinder 1 by taking this shape. At this time, the clip 19 can be easily inserted into the shaft tube 1. When the engagement is completed, the vertical portion 19x bites into the locking groove portion 4f with respect to the direction in which the clip 19 is pulled out, and there is an effect that it is more difficult to come off. The shape of the convex portion 19m may be the substantially wedge shape described in the first embodiment, and the engagement force with the locking groove portion 4f can be obtained even with the substantially wedge shape.

A third embodiment of the present invention will be described with reference to FIGS. The third embodiment is an example in which a plurality of engagement pieces formed on the side wall of the clip are formed. In the following, the description of the same configuration as in the first embodiment is omitted.
Also in the present embodiment, the two side walls 19c of the clip 19 are formed with engaging pieces protruding in the axial direction of the clip 19, respectively. The engaging pieces formed on one side wall 19c are formed as two front and rear independent engaging pieces 19o and 19p, and the end face portions on the axial direction side of the clips of the two engaging pieces 19o and 19p are formed. They are bent at different angles. That is, the end surface portion of the one engagement piece 19 o is bent toward the upper surface of the clip 19, and the end surface portion of the other engagement piece 19 p is bent toward the lower direction of the clip 19. Similarly, two engaging pieces 19o and 19p are formed on the other side wall 19c (FIG. 19).
In the present embodiment, when the engaging pieces 19o, 19p are engaged with the engaging groove portion 4f of the attaching portion 4c of the rear shaft 4, the clip 19 is formed above and below the engaging groove portion 4f. Can be held and the resilience of the engaging pieces 19o, 19p can be increased. That is, when the clip 19 is attached to the rear shaft 4, in addition to the elastic force of the engagement pieces 19o and 19p, the engagement pieces 19o and 19p of the clip 19 sandwich the locking groove 4f from the left and right directions. Due to this, an engaging force acts, and the clip 19 is engaged with the rear shaft 4. As a result, even when a force is applied in the left-right direction of the clip 19, the shift in the left-right direction can be prevented by the resilient force and the engaging force of the engagement pieces 19o, 19p. As in the prior art, in the engagement piece in which the end surface portion on the axial direction side of the clip of the engagement piece is bent at a single angle, the end surface portion only stretches in one direction of the locking groove portion 4f. Therefore, the elastic force of the engagement piece cannot be sufficiently obtained. Therefore, the shift of the clip to the left and right must be suppressed only by the engagement force, and as a result, the clip easily shifts to the left and right. In this respect, in this embodiment, a sufficient resilient force can be obtained in addition to the engaging force, and the clip 19 can be securely attached to the shaft tube.
In the present embodiment, two engagement pieces 19o and 19p are formed on each side wall 19c, but the present invention is not limited to this, and three or more may be formed. By forming a plurality of engagement pieces 19o and 19p on each side wall 19c and making the angles of the end face portions on the axial direction side of the clips of these engagement pieces different, the same effect as in this embodiment can be obtained, The clip 19 can be securely attached to the shaft tube. Further, the bending direction of the end surface portion on the axial direction side of the clip of the engagement piece may be a bending direction in which both the elastic force and the engaging force are obtained, and is not limited to the bending direction of the present embodiment.
Further, as in the first embodiment, as a configuration of this embodiment, when the clip 19 is attached to the shaft cylinder 1, the engagement pieces 19o and 19p of the clip 19 are connected to the locking groove 4f of the attachment portion 4c. In addition, the inner surface of the rear wall 19a of the clip 19 is in contact with the rear end wall 4h of the mounting portion 4c of the shaft cylinder 1. For this reason, there is also an advantage that attachment of the clip to the shaft cylinder becomes stronger when a sandwiched object having a relatively large thickness is inserted or when a force in the left-right direction is applied to the clip.

A fourth embodiment of the present invention will be described with reference to FIGS. 4th Example is an example which bent the front-end | tip of the engagement piece in a rear-end part to the outer-diameter direction of a shaft cylinder among the two engagement pieces formed in one side wall in 3rd Example. .
In the present embodiment, the engagement pieces formed on the side wall 19c of the clip 19 are formed as two front and rear independent engagement pieces 19q and 19r, of which the engagement piece 19r formed on the rear side The end surface portion on the axial direction side of the clip is bent in the outer diameter direction of the shaft tube. The engaging piece 19q formed in the front is projected to the axial direction side of the clip 19. With this configuration, when the engagement pieces 19q and 19r are engaged with the engagement groove portion 4f of the attachment portion 4c of the rear shaft 4, the engagement force is obtained by sandwiching the engagement groove portion 4f from the left and right directions by the engagement piece 19q. And an engaging force that holds the locking groove portion 4f (attachment portion 4c) by the engaging piece 19r. As described above, since the clip 19 is attached to the shaft tube 1 by the engaging force in two directions, the clip 19 can be more strongly engaged with the shaft tube, thereby reliably preventing the clip from shifting to the left and right. I can do it. As in the prior art, in the engagement piece in which the end surface portion on the axial direction side of the clip is bent at a single angle, the end surface portion only stretches in one direction of the locking groove portion, and the engagement piece is engaged. The engagement force of the piece cannot be obtained sufficiently. Therefore, it is necessary to suppress the shift of the clip to the left and right with only the engaging force, and as a result, the clip easily shifts. In this respect, in this embodiment, an engaging force in two directions can be obtained, and the clip 19 can be securely attached to the shaft tube.
In the present embodiment, two engaging pieces are formed on each side wall, but the present invention is not limited to this, and three or more engaging pieces may be formed. A plurality of engaging pieces are formed on each side wall, and the angle of the end surface portion on the axial direction side of the clips of these engaging pieces is made different so that each engaging piece can obtain an engaging force with the locking groove. Can be synergistic. Further, the bending direction of the end surface portion on the axial direction side of the clip of the engagement piece is not limited to the bending direction of the present embodiment as long as it is a bending direction in which two types of engagement forces can be obtained.
Further, as in the first embodiment, as a configuration of the present embodiment, when the clip 19 is attached to the shaft tube 1, the engaging pieces 19q and 19r of the clip 19 are engaged with the engaging groove portion 4f of the attaching portion 4c. In addition, the inner surface of the rear wall 19a of the clip 19 is in contact with the rear end wall 4h of the mounting portion 4c of the shaft cylinder 1. For this reason, there is also an advantage that attachment of the clip to the shaft cylinder becomes stronger when a sandwiched object having a relatively large thickness is inserted or when a force in the left-right direction is applied to the clip.

Further, a fifth embodiment of the present invention will be described with reference to FIGS. In the fifth embodiment, the end face of the engagement piece formed on the side wall of the clip so as to protrude in the axial direction of the clip is folded back to the side wall side, and the cross-sectional shape of the engagement piece is substantially U-shaped. This is the configuration. In the following, the description of the same configuration as in the first embodiment is omitted.
In the present embodiment, the end surface of the engagement piece 19s formed to protrude in the axial direction of the clip 19 on the side wall 19c of the clip 19 is folded back to the side wall 19c side, The cross-sectional shape is substantially U-shaped. More specifically, the engagement piece 19s is formed such that the end surface of the engagement piece 19s formed on the side wall 19c of the clip 19 is spaced from the clearance (lateral width) of the locking groove 4f of the attachment portion 4c on the axial direction side. The cross section is formed in a substantially U-shape by projecting approximately the same distance, then bending upward (toward the outer diameter direction of the shaft tube) and then bending again to the side wall 19c side. That is, the engagement piece 19s is bent so that the engagement piece 19s is thick. When the engagement piece 19s is engaged with the locking groove 4f of the mounting portion 4c, the engagement piece 19s is in contact with the three directions of the locking groove 4f in the axial direction and the vertical direction. With this configuration, the contact area between the locking groove 4f and the engagement piece 19s is increased, the engagement force is increased, and the cross-sectional secondary moment of the engagement piece 19s is increased by folding back, so that the engagement piece The rigidity of 19s itself can be raised. That is, by these two actions, it is possible to counter the rotational moment generated when the clip shifts to the left and right. As in the prior art, when the engagement piece 19s is not substantially U-shaped and is an engagement piece of the clip 19 bent only in the axial direction, the engagement piece has the thickness of the engagement piece itself. Only the generated secondary moment of section can be obtained, and sufficient rigidity cannot be obtained. As a result, the clip cannot easily withstand the rotational moment and is easily displaced. In this respect, in this embodiment, in addition to the engagement force between the engagement piece 19s of the clip 19 and the locking groove portion 4f of the shaft cylinder 1, the engagement piece 19s can obtain sufficient rigidity so that it can be reliably moved to the left and right of the clip. Can be prevented, and the clip 19 can be securely attached to the shaft tube.
Further, as in the first embodiment, as a configuration of this embodiment, when the clip 19 is attached to the shaft tube 1, the engagement piece 19s of the clip 19 is engaged with the locking groove 4f of the attachment portion 4c. In addition, the inner surface of the rear wall 19a of the clip 19 is in contact with the rear end wall 4h of the mounting portion 4c of the shaft cylinder 1. For this reason, there is also an advantage that attachment of the clip to the shaft cylinder becomes stronger when a sandwiched object having a relatively large thickness is inserted or when a force in the left-right direction is applied to the clip.

Finally, a sixth embodiment of the present invention will be described with reference to FIGS. In the sixth embodiment, an engagement piece projecting in the axial direction of the clip is formed on the side wall of the clip, and a caulking portion formed by cutting out a part of the side wall is provided. It is a configuration. A locking groove portion is also formed in the mounting portion of the shaft tube in this embodiment, as in the first embodiment. In the following, the description of the same configuration as in the first embodiment is omitted.
In this embodiment, the engagement piece 19t protruding in the axial direction of the clip 19 is formed on the side wall 19c of the clip 19, and a part of the side wall 19c is cut away. It is the structure which provided the crimping | crimped part 19u. More specifically, apart from the engagement piece 19t formed on the side wall 19c of the clip 19, one side is connected to the side wall 19c to a part of the side wall 19c, and the remaining three sides are separated from the side wall 19c. In this configuration, a square crimping portion 19u that can be collapsed inward is formed, and a locking groove portion 4f is provided on the attachment portion 4c of the rear shaft 4. Here, the crimping portion 19u is not limited to a quadrangular shape, but may be any shape as long as a part of the crimping portion is connected to the side wall and can be collapsed inward. When the clip 19 is attached to the rear shaft 4, after the engaging piece 19t of the clip 19 is engaged with the locking groove 4f of the attaching portion 4c, the caulking portion 19u is further caulked to engage the caulking portion 19u. The bite clip 19 is fixed to the stop groove portion 4f. This prevents the clip 19 from shifting to the left and right by engaging with the engagement piece 19t and engaging the caulking portion 19u with the engaging groove portion 4f. Can be prevented. At this time, the caulking portion 19u is caulked and bites into the locking groove portion 4f, so that the removal of the clip 19 can be more reliably suppressed in the direction in which the clip 19 comes off. As in the prior art, in the case of a clip that does not have a crimped portion, it is necessary to cope with the shift to the left and right of the clip and the clip dropout only by the engagement force of the engagement piece. Will occur. In this respect, in this embodiment, even if the shape of the engagement piece 19t is simplified by distributing the load applied to the clip 19 to the engagement piece 19t and the crimping portion 19u, the engagement force is applied to each engagement portion. By being obtained, it is possible to reliably prevent the clip from slipping out or coming out, and the clip 19 can be reliably attached to the shaft tube.
Further, as in the first embodiment, as a configuration of this embodiment, when the clip 19 is attached to the shaft tube 1, the engaging piece 19t of the clip 19 is engaged with the locking groove 4f of the attaching portion 4c. In addition, the caulking portion 19u is further caulked, and the inner surface of the rear wall 19a of the clip 19 and the rear end wall 4h of the mounting portion 4c of the shaft cylinder 1 are in contact with each other. For this reason, there is also an advantage that attachment of the clip to the shaft cylinder becomes stronger when a sandwiched object having a relatively large thickness is inserted or when a force in the left-right direction is applied to the clip.

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Tip member 2a Female screw part 2b Inner step part 2c Step part 3 Front shaft 3a Male screw part 3b Reduced diameter part 3c The most contracted diameter part 3d Convex part 3e Polygon part 3f Front end surface 3g Straight part 4 Rear shaft 4a Spiral groove 4b Rib 4c Attachment part 4d Decoration part 4e Thick part 4f Locking groove part 4g Projection 4h Rear end wall 4i Front end wall 4j Step part 4k Rear end surface 5 Medium shaft set 6 Pipe 7 Core holding part 8 Slider 9 Core tank 9a Front end face 9b rear end surface 10 chuck body 11 chuck ring 11a collar 11b rear end surface 12 core 12a straight portion 13 inner collar 13a rear end surface 14 repellent member 15 outer collar 15a front end surface 15b rear end surface 16 eraser 17 eraser guide member 17a guide Groove 17b Extension portion 17c Gap 17d Wall portion 17e Outer cut piece 17f Inner cut piece 17g Expanded portion 17h Rear end 17i outer flange portion 17j front end surface 17k inward convex portion 18 eraser receiver 18a leg portion 18b convex portion 19 clip 19a rear wall 19b base portion 19c side wall 19d engaging piece 19e concave and convex portion 19f concave portion 19g ball portion 19h convex portion 19i concave portion 19i concave portion 19i Part 19k engaging piece 19l recessed part 19m protruding part 19n uneven part 19o engaging piece 19p engaging piece 19q engaging piece 19r engaging piece 19s engaging piece 19t engaging piece 19u crimping part 19v slope part 19w straight part 20 gripping member 20a Protrusion 20b Base

Claims (10)

A clip mounting structure in which a base portion of a clip is engaged with a mounting portion projecting from an outer surface of a shaft cylinder. The clip has two side walls facing each other, and each side wall has Engagement pieces projecting in the axial direction of the clip are formed, and each engaging piece is formed with two convex portions on the end surface portion on the axial direction side of the clip, and the two convex portions are Formed in the vicinity of both ends of the end surface portion of the engagement piece, on the other hand, the mounting portion of the shaft tube is formed with locking groove portions on both side surfaces thereof, and the engaging piece of the clip is formed on the locking groove portion of the mounting portion. A clip mounting structure characterized by being engaged. A writing instrument provided with a clip by the clip mounting structure according to claim 2. A clip formed by engaging a base portion of a clip with a mounting portion projecting from an outer surface of a shaft cylinder, wherein the clip has two opposing side walls, and each side wall has an axis of the clip The engagement pieces projecting in the direction are formed, and the engagement pieces are formed at different positions in the longitudinal direction of the clip. On the other hand, the mounting portion of the shaft cylinder has locking groove portions on both side surfaces thereof. And a clip mounting structure, wherein the engaging piece of the clip is engaged with a locking groove of the mounting portion. A writing instrument provided with a clip by the clip mounting structure according to claim 3. A clip formed by engaging a base portion of a clip with a mounting portion projecting from an outer surface of a shaft cylinder, wherein the clip has two opposing side walls, and each side wall has an axis of the clip Two engaging pieces projecting in the direction are formed, and the angles of the end face portions on the axial direction side of the clips of the engaging pieces are made different. On the other hand, the mounting portion of the shaft cylinder is engaged with both side surfaces thereof. A clip mounting structure, wherein a stop groove portion is formed, and an engagement piece of the clip is engaged with a locking groove portion of the mounting portion. A writing instrument provided with a clip by the clip mounting structure according to claim 5. A clip formed by engaging a base portion of a clip with a mounting portion projecting from an outer surface of a shaft cylinder, wherein the clip has two opposing side walls, and each side wall has an axis of the clip An engagement piece projecting in the direction is formed, and an end surface portion on the axial direction side of the clip of the engagement piece is formed by folding back to the side wall side. An attachment structure for a clip, wherein an engagement groove portion is formed on a surface, and an engagement piece of the clip is engaged with an engagement groove portion of the attachment portion. A writing instrument provided with a clip by the clip mounting structure according to claim 7. A clip formed by engaging a base portion of a clip with a mounting portion projecting from an outer surface of a shaft cylinder, wherein the clip has two opposing side walls, and each side wall has an axis of the clip An engagement piece projecting in the direction is formed, and a caulking portion is formed by cutting out a part of the side wall. On the other hand, the mounting portion of the shaft tube has a locking groove portion on both side surfaces thereof. The clip mounting structure is characterized in that the engaging piece of the clip is engaged with the locking groove portion of the mounting portion, and the caulking portion is bitten into the locking groove portion. A writing instrument provided with a clip by the clip mounting structure according to claim 9.

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