JP4909149B2 - Clip mounting structure for writing instrument and manufacturing method of clip mounting structure for writing instrument - Google Patents

Description

  The present invention relates to a clip mounting structure for a writing instrument that allows the tip end of the clip to be opened by a knob operation on the rear end of the writing instrument.

Conventionally, in this kind of invention, as described in Patent Document 1, for example, one end side of a substantially U-shaped pinching spring (20) is fitted to the cylindrical body 10, and the pinching spring (20) And the clip (30) is supported between the other end side of the tube and the outer peripheral surface of the cylindrical body (10).
However, according to the prior art, it is difficult to fit the pinching spring (20) into the cylindrical body (10), and the productivity has been demanded such that the pinching spring (20) is easily lost.

  As another related technique, for example, as in the invention described in Patent Document 2, an elastic body (10) is fitted between the rear end side of the clip (5) and the shaft cylinder (2), and the There is one in which the front end side of the clip (5) is closed by the elastic force of the elastic body (10). However, this prior art also has a productivity problem that it is difficult to fit the elastic body (10).

Furthermore, as another related technique, for example, as in the invention described in Patent Document 3, the clip body (4) and the holder body (5) are connected by a swingable bending piece (6), and the clip base end (7) The outer periphery of the bent piece (6) and the support base end (8) is covered with the soft coating layer (13), and the clip main body (4) and the support base end (8) are integrated with an elastic connecting portion ( There is something linked in 14).
Also in this conventional technique, since it is a structure which shape | molds a soft coating layer (13) and an elastic connection part (14), complicated shaping | molding techniques, such as insert molding, are required. In addition, when the clip (1) is repeatedly opened and closed, there is a risk that the connection portion between the rear end portion of the clip body (4) and the bent piece (6) will be fatigued.
JP 2001-146094 A JP 2005-313329 A JP 2006-315179 A

  This invention is made | formed in view of the said conventional situation, The process made into the subject is providing the manufacturing method of the clip attachment structure for writing instruments excellent in productivity and durability, and this clip attachment structure for writing instruments. is there.

  In order to solve the above-mentioned problems, a clip mounting structure for a writing instrument according to the present invention comprises a clip support portion provided on an outer peripheral portion of a shaft tube, and a clip portion that is pivotally supported by the clip support portion and can swing. Clip mounting structure for a writing instrument such that the front side of the clip part is swayed in the axial cylinder centrifugal direction by pressing the rear side of the swaying fulcrum part in the shaft part in the axial direction. The clip support portion is provided with an elastic portion that protrudes backward so as to be elastically bent in the shaft tube centripetal direction, and the elastic portion has a flexible connecting portion on the rear end side thereof. The rear end side of the clip portion is connected, and the clip portion is partially brought into contact with the elastic portion between the swing fulcrum portion and the connection portion.

Here, the elastic portion may be a member that elastically bends in the shaft centripetal direction due to the pressing force from the shaft cylinder centrifugal direction and elastically recovers when the pressing force is removed. It is comprised from a synthetic resin material etc., Especially preferably, it is comprised from a synthetic resin material.
Further, the connecting portion is a portion connecting the rear end side of the elastic portion and the rear end side of the clip portion, and preferably has a configuration having flexibility from the viewpoint of improving manufacturability, Particularly preferably, it is made of a synthetic resin material that is thinner than the elastic portion and the clip portion.
Moreover, although the said clip support part, the said elastic part, the said connection part, and the said clip part are good also as an aspect formed by integrally connecting a separate member, More preferably, the aspect integrally molded from the synthetic resin material It is said.

  Further, as a more preferable aspect, the elastic portion is elastically bent in the shaft tube centripetal direction by contact with the clip portion, and the front side of the swing fulcrum portion of the clip portion is positioned on the outer periphery of the shaft tube. It is characterized by being brought into contact with the surface.

  As a more preferable aspect, a convex piece portion along the axial direction of the axial cylinder is provided on one of the clip support portion and the clip portion, and a concave portion that fits the convex piece portion is provided on the other side. It is characterized by.

  As a more preferred aspect, the clip portion is configured to be unevenly fitted to a side portion of the clip support portion to constitute the swing fulcrum portion.

  Further, the manufacturing method of the clip mounting structure for a writing instrument according to the present invention is capable of flexibly elastically projecting in the axial centripetal direction by projecting rearward from the clip supporting portion provided on the outer peripheral portion of the axial tube. And a clip portion connected to the rear end of the elastic portion via a flexible connection portion, and then the clip portion is rotated to engage the clip support portion. Thus, a swing fulcrum part for swinging the clip part is formed on the front side of the connection part in the clip part, and the gap between the swing fulcrum part and the connection part in the clip part is formed. The elastic part is partially brought into contact with the elastic part.

  As a more preferred aspect, the clip portion is provided with a main body portion disposed along the outer surface of the shaft cylinder, and side portions disposed on both sides of the main body portion and rotatable with respect to the main body portion. Are formed integrally with each other, and the respective side portions are rotated and fitted to the clip support portion to constitute a swing fulcrum portion of the clip portion.

Since the present invention is configured as described above, the following effects can be obtained.
Since the clip support part, clip part, support part, etc. are integrally configured, there is less loss or dropout of parts during manufacturing compared to the conventional structure where the clip part, support part, etc. are configured separately. Good productivity.
In addition, since the portion between the swing fulcrum portion and the connection portion is partially in contact with the elastic portion, the load applied to the connection portion can be made relatively small, and the connection portion is damaged due to repeated loads and the like. Can be prevented.
Therefore, the productivity and durability of the clip mounting structure for writing instruments can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a writing instrument A provided with an example of a clip mounting structure for a writing instrument according to the present invention.
The writing instrument A is a retractable ballpoint pen that causes a writing portion (not shown) at the tip of the ballpoint pen refill 20 to protrude and retract by a knocking operation on the rear end side of the shaft tube 10. A refill advance / retreat unit 30 having a clip support portion 32, a clip portion 35, and the like is configured.
Then, the writing instrument A has its rear side pressed from the swing fulcrum part p in the clip part 35 in the axial centripetal direction (downward in FIG. 1), so that the writing tool A is in front of the swing fulcrum part p of the clip part 35. As shown in FIG. 1 (b), the portion side is swung in the axial tube centrifugal direction (upward in FIG. 1).

  The refill advance / retreat unit 30 is provided with a refill advance / retreat mechanism 36 for advancing and retracting the ballpoint pen refill 20 inside a rear end cylindrical portion 31 which is fitted and fixed to a rear end opening of the axial barrel 10 and constitutes a rear end portion of the axial barrel 10. It is composed.

The rear end cylindrical portion 31 has a substantially stepped cylindrical shape composed of a front small diameter portion 31a and a rear large diameter portion 31b, and the small diameter portion 31a is fitted and fixed in the rear end opening of the shaft tube 10, The large diameter portion 31b is exposed to the rear of the shaft cylinder 10.
And the clip support part 32, the elastic part 33, the connection part 34, the clip part 35, etc. are integrally molded by the outer peripheral surface of this rear end cylinder part 31. FIG.

According to the illustrated example, the clip support portion 32 is formed in a substantially hollow rectangular parallelepiped shape protruding in the centrifugal direction from the outer peripheral surface of the rear end cylindrical portion 31, and a protruding piece portion of the clip portion 35 described later is formed on the protruding end surface. A recess 32a is provided so as to fit into 35c (see FIG. 2).
Further, on both side walls of the clip support portion 32, through holes 32b and 32b for fitting side portions 35e of the clip portion 35 to be described later into a concavo-convex shape are provided.
An elastic portion 33 that protrudes rearward is provided on the rear side of the clip support portion 32 so as to bend elastically in the axial tube centripetal direction.

According to the illustrated example, the elastic portion 33 has a substantially tapered shape extending rearward from the clip support portion 32, and the tip end side thereof is elastic in the shaft tube centripetal direction by a pressing force received from a clip portion 35 described later. To bend.
And the rear end part of the clip part 35 is connected to the front-end | tip part (in other words, rear-end part) of this elastic part 33 via the connection part 34 which has flexibility.

  The connecting portion 34 is a portion configured to bendable by being formed thinner than the elastic portion 33 and a clip portion 35 described later. The connecting portion 34 becomes a swing fulcrum portion p when the clip portion 35 is rotated and assembled to the clip support portion 32.

Further, the clip portion 35 has a rear end portion connected to the connection portion 34, and as shown in FIGS. 2 and 3A, the clip portion 35 intersects the clip support portion 32 (or the shaft tube 10) (see FIG. According to the example shown, it is arranged and shaped substantially vertically).
Then, the clip portion 35 rotates while bending the connecting portion 34 to fit the clip support portion 32 to constitute the swing fulcrum portion p (see FIGS. 3A and 3B). A contact portion 35 b between the swing fulcrum portion p and the connection portion 34 is partially in contact with the elastic portion 33.

  If it demonstrates in detail, the clip part 35 will be the main-body part 35a formed in flat form along the axial cylinder 10, and the contact part which protrudes toward the elastic part 33 from the rear end side of the back surface in this main-body part 35a. 35b, a convex piece portion 35c disposed on the front side of the corresponding contact portion 35b, a ball portion 35d projecting on the front end side of the back surface of the main body portion 35a, and substantially on both sides on the rear end side of the main body portion 35a. Side portions 35e and 35e projecting in a shape are integrally provided.

The abutting portion 35b is formed in a semi-cylindrical shape substantially perpendicular to the axial direction of the axial cylinder of the abutting portion 35b, and abuts against the elastic portion 33 when the clip portion 35 is assembled to the clip supporting portion 32.
The convex piece portion 35 c is a substantially flat projection disposed along the axial direction of the cylinder, and is loosely fitted to the concave portion 32 a of the clip support portion 32. If this loosely fitted state is described in more detail, the gap between the clip portion 35 and the recess 32a is the minimum necessary size so that the clip portion 35 does not rattle in the axial direction with respect to the clip support portion 32. Is set to Note that there is no gap, and the clip portion 35 may be fitted in sliding contact with the recess 32a.

  Each side part 35e is connected to the main body part 35a by a thin connection part 35e1 so as to be bent from a position substantially flush with the main body part 35a to a position substantially perpendicular to the main body part 35a (see FIG. 4). ).

The side portion 35 e is provided with a protrusion 35 e 2 that is inserted into the through hole 32 b on the side wall of the clip support portion 32 and constitutes the swing fulcrum portion p of the clip portion 35.
The protrusion 35e2 is formed in a substantially columnar shape whose diameter is enlarged at the front end side so as not to be pulled out when inserted into the through hole 32b.

The rear end cylindrical portion 31, the clip support portion 32, the elastic portion 33, the connection portion 34, and the clip portion 35 having the above configuration are, for example, PET (polyethylene terephthalate), PC (polycarbonate), PP (polypropylene), and POM (polyacetal). , GFRP (glass fiber reinforced plastic), etc., and is integrally formed of a synthetic resin material that can be elastically bent.
The elastic portion 33 can be made of a synthetic resin material different from other portions by double molding. In this case, the elastic portion 33 is made of a synthetic resin material (for example, higher in elasticity than the other portions). It is preferable to use an elastomer resin or the like.

The refill advance / retreat mechanism 36 includes a slide groove 31c formed on the inner peripheral surface of the rear end cylindrical portion 31, a knock operation portion 36a that advances and retreats while being guided by the slide groove 31c, and an inclined surface of the front end surface of the knock operation portion 36a. A rotor 36b that rotates in engagement with the rotor 36b, a spring 36c that biases the ball pen refill 20 fitted in the rotor 36b and the rotor 36b rearward, a receiving member 36d that receives the spring 36c from the front side, etc. Is a known advance / retreat mechanism (see, for example, JP-A-2004-209881).
According to the refill advance / retreat mechanism 36, the writing portion (not shown) of the ballpoint pen refill 20 can be caused to appear and disappear from the tip of the shaft tube 10 by a knock operation on the knock operation portion 36a.

Next, the assembly procedure of the clip part 35 in the writing instrument A will be described in detail.
In a state before the clip portion 35 is engaged with the clip support portion 32, as shown in FIG. 3A, the clip portion 35 is separated from the clip support portion 32 and is substantially separated from the clip support portion 32 and the elastic portion 33. Located at right angles.
When the clip portion 35 is pushed from the rear side of the shaft tube, the clip portion 35 rotates while bending the connecting portion 34, and the convex piece portion 35 c is loosely fitted in the concave portion 32 a of the clip support portion 32.

  Therefore, as shown to Fig.4 (a), the convex piece part 35c of the clip part 35 and the recessed part 32a of the clip support part 32 fit, and the touch to the axial cylinder circumferential direction of the clip part 35 is suppressed. Become.

Next, as shown in FIG. 4B, the side portion 35e of the clip portion 35 is rotated, and the protrusion 35e2 on the inner surface of the side portion 35e is inserted into the through hole 32b of the clip support portion 32, whereby the clip A swing fulcrum portion p for swinging the portion 35 is configured.
At this time, as shown in FIG. 3B, the ball portion 35d on the front end side of the clip portion 35 contacts the outer peripheral surface of the shaft tube 10, and the rear end side of the elastic portion 33 applies the pressing force from the contact portion 35b. In response to this, the shaft cylinder is bent in the centripetal direction (downward in the figure), and this bent state is maintained.
Therefore, it is possible to prevent a gap from being generated between the ball portion 35d and the outer peripheral surface of the shaft tube 10, and the object to be clamped such as paper or clothing is clamped by the elastic restoring force of the elastic portion 33. Can be pinched securely.

When the object to be clamped is a relatively thick object, the rear end portions of the clip portion 35 and the shaft tube 10 are gripped as shown in FIG. When a pressing force in the tube centripetal direction is applied, the elastic portion 33 is elastically bent, the front side of the clip portion 35 swings in the axial tube centrifugal direction around the swing fulcrum portion p, and the ball portion 35d of the clip portion 35 And the outer peripheral surface of the shaft tube 10 can be widened.
And if the said pressing force is cancelled | released, the clip part 35 front part side will rock | fluctuate to a shaft cylinder centripetal direction with the elastic restoring force of the elastic part 33. FIG.

Further, the action of the contact portion 35b will be described in detail. Since the elastic portion 33 is partially contacted by the contact portion 35b, a local load is received at the contact portion. For this reason, it is possible to prevent a portion other than the contact portion such as the connection portion 34 from being damaged by a compressive load received from the clip portion 35.
That is, if the contact portion 35b is omitted from the writing instrument clip mounting structure, since the pressing force received on the rear end side of the clip portion 35 is applied to the connection portion 34, the connection portion 34 may be damaged. The However, according to this embodiment, the connection portion 34 can be prevented from being damaged as described above, and the connection portion 34 is formed in a thin shape that can be easily bent, and the clip portion 35 is rotated. The manufacturing workability at the time of moving and engaging with the clip support part 32 can be improved.
In addition, there is a possibility that the connection portion 34 is subjected to a tensile load due to the action of the contact portion 35b described above. However, since the synthetic resin material is generally strong in the tensile load as compared with the compressive load, The possibility of causing damage to the connecting portion 34 is low.

  Moreover, according to the said embodiment, although the side part 35e of the clip part 35 was rotated and it fitted in the through-hole 32b of the clip support part 32, it shows to FIG.5 and FIG.6 as another example. It is possible to set it as an aspect. In addition, in the aspect shown below, about the structure substantially the same as the said writing instrument A, the detailed description which overlaps is abbreviate | omitted by attaching | subjecting the same code | symbol.

In the embodiment shown in FIG. 5, with respect to the writing instrument A, the clip portion 35 is replaced with a clip portion 35 ′, the clip support portion 32 is replaced with a clip support portion 32 ′, and the clip portion 35 ′ and the clip support portion 32 ′ are replaced. These side portions are fitted in a concavo-convex shape to form a swing fulcrum portion p having a simpler structure.
If it demonstrates in detail, clip part 35 'will be formed in the cross-sectional substantially concave shape opened downward, and it has the recessed part 35a' of cross-sectional substantially semicircle shape in each inner surface of the both sides.
In addition, the clip support portion 32 ′ is formed in a substantially convex cross section that fits into the clip portion 35 ′, and a convex portion 32a ′ in a substantially semicircular cross section that fits into the concave portion 35a ′ is formed on each of both side surfaces thereof. Have.
And when clip part 35 'fits with clip support part 32' from upper direction, between both side walls is elastically expanded, and recessed part 35a 'is fitted with convex part 32a'.

Further, in the embodiment shown in FIG. 6, with respect to the writing instrument A, the clip portion 35 is replaced with the clip portion 35 ″, the clip support portion 32 is replaced with the clip support portion 32 ″, and the shaft member 50 is added. Yes.
The clip portion 35 ″ is formed in a substantially concave shape with the opening facing downward, and a through hole 35a ″ is formed in each of both side walls thereof.
Further, the clip support portion 32 ″ is formed in a substantially convex shape that fits into the clip portion 35 ″, and has a through hole 32a ″ that communicates with both the through holes 35a ″ and 35a ″ of the clip portion 35 ″. ing.
The shaft member 50 is a pin-like member having a head that is enlarged in diameter on one end side (left end side in FIG. 6), and includes both through holes 35a ″ and 35a ″ on the clip portion 35 ″ side and a clip support portion. It is inserted into the 32 ″ through hole 32a ″ and its protruding end is crimped.
Therefore, according to the aspect shown in FIG. 6, the clip part 35 ″ can be swung with the shaft member 50 as the swinging fulcrum part p.

  Note that, according to the illustrated writing instrument A, the abutting portion 35b protruding from the clip portion 35 is partially brought into contact with the elastic portion 33 between the swing fulcrum portion p and the connecting portion 34. As another example, the contact portion 35b is omitted, and a contact portion (not shown) is provided on the elastic portion 33 side so that the contact portion contacts the back surface of the clip portion 35. You may do it.

It is sectional drawing which shows an example of the clip attachment structure for writing instruments which concerns on this invention, (a) shows the state by which the clip part was closed, (b) shows the state by which the clip part was open | released. It is a perspective view of the attachment structure. It is principal part sectional drawing which shows the assembly procedure of the attachment structure to (a) and (b) sequentially. It is principal part sectional drawing which shows the assembly procedure of the attachment structure to (a) and (b) sequentially. It is principal part sectional drawing which shows the other example of the clip attachment structure for writing instruments which concerns on this invention. It is principal part sectional drawing which shows the other example of the clip attachment structure for writing instruments which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Shaft cylinder 32: Clip support part 32a: Concave part 33: Elastic part 34: Connection part 35: Clip part 35a: Main body part 35b: Contact part 35c: Convex piece part A: Writing tool p: Swing fulcrum part

Claims (6)

A clip support portion provided on the outer peripheral portion of the shaft cylinder and a clip portion pivotable on the clip support portion and capable of swinging, the rear side of the clip portion being pressed in the shaft tube centripetal direction. In the clip mounting structure for a writing instrument in which the front side of the clip portion is swung in the axial tube centrifugal direction with respect to the swing fulcrum portion of the clip portion,
The clip support portion is provided with an elastic portion protruding rearward so as to be elastically bent in the axial tube centripetal direction, and the clip portion is connected to a rear end side of the elastic portion via a flexible connecting portion. The rear end of the
The clip attachment structure for a writing instrument, wherein the clip portion is partially in contact with the elastic portion between the swing fulcrum portion and the connection portion.   The elastic portion is elastically bent in the shaft tube centripetal direction by contact with the clip portion, and the front side of the swing fulcrum portion of the clip portion is brought into contact with the outer peripheral surface of the shaft tube. The clip mounting structure for a writing instrument according to claim 1, characterized in that:   The convex piece portion along the axial tube axis direction is provided on one of the clip support portion and the clip portion, and the concave portion that fits the convex piece portion is provided on the other side. The clip mounting structure for a writing instrument according to 1 or 2.   4. The clip attachment for a writing instrument according to claim 1, wherein the clip portion constitutes the swing fulcrum portion by fitting in an uneven shape to a side portion of the clip support portion. 5. Construction. A clip support provided on the outer periphery of the shaft tube, an elastic portion that protrudes rearward from the clip support portion and can be elastically bent in the shaft tube centripetal direction, and a flexible member at the rear end of the elastic portion. After integrally forming the clip portion connected via the connection portion,
By rotating the clip part and engaging with the clip support part,
A swing fulcrum portion for swinging the clip portion is formed on the front side of the connection portion in the clip portion, and the elastic portion is provided between the swing fulcrum portion and the connection portion in the clip portion. A method of manufacturing a clip mounting structure for a writing instrument, wherein the clip mounting structure is partially brought into contact with a portion. The clip portion is integrally formed from a main body portion disposed along the outer surface of the shaft cylinder and side portions disposed on both sides of the main body portion and rotatable with respect to the main body portion. And
6. The method of manufacturing a clip mounting structure for a writing instrument according to claim 5, wherein each side portion is rotated and fitted to the clip support portion to constitute a swing fulcrum portion of the clip portion.

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