JP2004223971A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a writing utensil capable of being made by employing the conventional clip structure and material, being clipped between a clip and a barrel and hardly allowed to come off even if it is clipped on a once-clipped pocket or a hard member such as a book. <P>SOLUTION: In the writing utensil enabling to pinch the matter to be pinched between a pinching part formed on the inside surface of the clip formed or attached en bloc to the rear end part of the barrel and the surface oppositely facing to the pinching part of the barrel, in the barrel, the surface oppositely facing to the pinching part of the barrel and the surface peripherally opposite to the surface oppositely facing to the pinching part of the barrel of the barrel are made of a rigid material and a stopper part made of a non-rigid material is formed on the rear end side of the barrel toward the axis center line direction from the pinching part of the clip. At the same time, the maximum distance L between the axis center line and the surface of the barrel at the position oppositely facing to the pinching part formed on the inside surface of the clip and the maximum distance M between the axis center line and the surface of the stopper part are formed so as to satisfy L≤M. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a writing instrument having a clip integrally or attached to a rear end of a barrel.
[0002]
[Prior art]
[Patent Document 1]
"JP-A-2001-10287"
[Patent Document 2]
"JP-A-2001-146094"
[Patent Document 3]
"JP-A-57-193397"
[Patent Document 4]
"Registered Utility Model No. 3009092"
[0003]
2. Description of the Related Art A writing instrument in which a clip is integrally formed or attached to a rear end portion of a barrel is well known. A writing instrument having such a clip holds an object to be held such as a pocket of clothes, a book, a notebook, etc., between a holding portion such as a ball formed on an inner surface of the clip and a barrel. The clamping force between the clip and the shaft cylinder is determined by the structure of the base of the clip, the rigidity of the material, and the like.
[0004]
However, it is desired that the holding force be set higher so that the holding portion of the clip and the held object do not easily come off due to vibration or impact during movement. In particular, there is a problem that a sandwiched object made of a hard material such as a book or an underlay is likely to come off. However, if the holding force is simply increased, there is a contradictory problem that the opening between the clip and the barrel becomes small, and the clip is easily broken, for example, being broken.
[0005]
In consideration of such clipping force and breakage such as breakage, Japanese Patent Application Laid-Open No. 2001-10287 discloses a writing instrument, in which an elastomer resin portion is provided in a part of the clip, or a clip attaching device for a writing instrument disclosed in Japanese Patent Application Laid-Open No. 2001-149094. ], It is necessary to attach a reinforcing member such as a U-shaped pinch spring. In the former, the strength against breakage and other breakage is improved due to partial elastic deformation in the elastomer resin portion. It is necessary to consider the clipping force and durability such as breakage of the clip due to the material or shape newly reduced. In the latter case, there is a problem that the structure becomes complicated due to the addition of a separate member, which leads to an increase in the number of parts, and it is difficult to adopt a low-priced writing instrument due to manufacturing problems.
[0006]
[Problems to be solved by the invention]
By the way, in Japanese Patent Application Laid-Open No. 57-193397, “A non-slip writing implement and a method for manufacturing the same”, a soft material such as a thermoplastic elastomer is used to hold a soft part such as a thermoplastic elastomer on a barrel of a writing implement formed of a hard material such as polypropylene or polyethylene terephthalate. Disclosed is a writing instrument barrel attached to the entire barrel.
[0007]
Attaching a soft material such as a thermoplastic elastomer to the shaft cylinder of a writing instrument made of such a hard material has a good feel due to its low hardness, and the soft material has a higher friction coefficient than the hard material. This is because it is highly effective as a non-slip when gripping the barrel of the writing instrument. However, if the surface of the barrel at the position facing the holding portion at the tip of the clip is made of a soft material, such as by attaching a thermoplastic elastomer to the entire barrel, as described above, the friction of the soft material Since the coefficient is high, there is a problem that a pocket, a book, or the like does not easily enter between the holding portion of the clip and the shaft cylinder, and as a result, it is difficult to hold the clip.
[0008]
In view of the above facts, the present invention can follow the structure and material of the conventional clip, can be easily clamped between the clip and the shaft cylinder, and the clamped member such as a pocket or book once clamped is formed of a hard material. It is an object of the present invention to obtain a writing instrument that is not easily detached even if it is done.
[0009]
[Means for Solving the Problems]
According to the present invention, a clip is integrally formed or attached to a rear end portion of a barrel, and an object to be clamped is sandwiched between a clamping portion formed on an inner surface of the clip and a surface of the barrel facing the clamping portion. In a possible writing instrument, the barrel has a surface of the barrel facing the holding portion and a surface of the barrel facing the holding portion formed in a circumferential direction by a hard material. A stopper portion formed of a soft material is formed on the surface of the barrel at the rear end side of the barrel in the axial direction from the holding portion, and the barrel at a position facing the holding portion formed on the inner surface of the clip from the shaft center. Assuming that the maximum distance L to the surface and the maximum distance M from the axis to the surface of the stopper portion are such that L ≦ M is satisfied.
[0010]
In addition, a grip member made of a soft material is mounted on the grip portion of the shaft cylinder, and is formed so as to satisfy N <L when a maximum distance N from the axis to the surface of the grip member is set.
[0011]
The hard material of the present invention is a hard material generally known as a barrel of a writing instrument, such as a resin material such as polyethylene, polypropylene, polyethylene terephthalate, and ABS resin, and a metal material such as brass and stainless steel. Soft materials are generally known as non-slip members such as silicone rubber, butyl rubber, fluorine rubber, vinyl chloride resin, butadiene rubber, urethane rubber, and thermoplastic elastomers such as olefin elastomers and styrene elastomers. Soft material.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. In this embodiment, a knock-type ballpoint pen will be described for convenience, but the present invention is not limited to these embodiments.
[0013]
The writing implement 1 according to the first embodiment shown in FIGS. 1 and 2 includes a feeding mechanism including a rotary cam 6 in a shaft cylinder formed by screwing a front shaft 2 and a rear shaft 3 together. The feeding mechanism is conventionally known, and, when briefly described, a cam groove (not shown) for slidingly guiding and rotating the rotary cam 6 back and forth is formed on the inner wall surface of the rear shaft 3. The projection formed on the rotary cam 6 is arranged in engagement with the cam groove. At the rear end of the rotary cam 6, a knock body 5 having a cam portion at the front end for sliding the rotary cam 6 to impart rotation is provided, and the rear end of the knock body 5 is formed of a rear shaft rear end 3a. This is a knock-type writing instrument provided so as to protrude outward from the opening.
[0014]
An ink storage tube 8 containing ink for writing implements (not shown) is urged toward the rear end 3a of the rear shaft by a spring 7 in front of the rotary cam 6 in the shaft cylinder, and is slidably disposed. I have.
[0015]
First, the front shaft 2 is formed from a hard material such as ethylene nitrile styrene resin. The grip portion 3 of the barrel 2 has an outer diameter smaller than the outer diameter of the barrel. Next, a soft material such as an olefin-based elastomer is mounted on the gripping portion by two-color molding to form the grip member 10.
[0016]
Similarly to the front shaft 2, the rear shaft 3 is formed by molding the rear shaft 2 with a hard material such as ethylene nitrile styrene resin. A clip 4 is formed integrally with the rear shaft 3, and forms a holding portion 4 a on the inner surface of the clip 4. Next, a soft material such as an olefin elastomer is circumferentially mounted by two-color molding so as to be positioned on the surface of the barrel on the rear end portion 3a side of the rear shaft 3 in the axial direction from the clipping portion 4a of the clip. A stopper 11 having a semicircular protrusion is formed. At this time, the maximum distance L from the axis JJ to the surface of the stopper portion 11 relative to the maximum distance L from the axis JJ to the surface A of the shaft cylinder facing the holding portion 4a formed on the inner surface of the clip 4. By setting M to the same diameter or more (L ≦ M), when the object to be clamped 12 is clamped, it always comes into contact with the stopper portion 11 so that it does not come off easily.
[0017]
As shown in FIG. 3, the surface A of the shaft cylinder facing the holding portion 4a formed on the inner surface of the clip 4 and the surface B of the shaft cylinder facing the surface of the shaft cylinder in the circumferential direction are hardened with a small friction coefficient. By using the material, when the object to be clamped 12 is sandwiched between the members, the material slides well and easily enters (in the direction of arrow F in FIG. 3). As the approach proceeds further, since the stopper portion 11 made of a soft material is formed on the surface of the shaft cylinder on the rear end portion 3a side of the rear shaft 3 in the axial direction from the holding portion 4a of the clip 4, the clip is once used. Once sandwiched, the object to be sandwiched is always in contact with the soft material having a high coefficient of friction, and therefore does not easily come off.
[0018]
The writing instrument 21 according to the second embodiment shown in FIG. 4 is configured such that the maximum distance N from the axis JJ to the surface of the grip member 10 attached to the grip portion of the front shaft 2 indicates that the writing tool 21 has In the same manner as in the first embodiment except that the maximum distance L to the shaft cylinder surface A facing the holding portion 24a formed on the inner surface of the clip 24 formed integrally with the clip 24 is made large (N <L). To obtain a writing instrument with a clip.
[0019]
From the maximum distance N from the axis JJ to the surface of the grip member 10, the maximum distance L from the axis JJ to the shaft cylinder surface A at a position facing the holding portion 24 a of the clip 24 is defined as a large diameter (N <L). 5), even when the grip member 10 is formed of a soft material, when the held member 32 is held between the holding portions 24a of the clip 24, as shown in FIG. A gap K is formed between the clip members 24, so that the held member 32 does not easily come into contact with the grip member 10 and can be smoothly held by the clip 24.
[0020]
The material of the hard material and the soft material of the present invention is not limited to the above embodiment, and can be appropriately selected and used. In this embodiment, the stopper has a semicircular projection, but the shape is not particularly limited, and the maximum distance from the axis to the stopper is the inner surface of the clip from the axis. The diameter may be equal to or greater than the maximum distance of the surface of the barrel at the position facing the holding portion formed in the above. Further, in the present embodiment, the stopper portion is provided circumferentially, but the stopper portion is not particularly limited as long as it is formed at least on the surface of the rear end of the barrel in the axial direction from the clip holding portion.
[0021]
【The invention's effect】
Since the present invention is configured as described above, it can follow the structure and material of the conventional clip, can be easily clamped between the clip and the shaft cylinder, and the clamped member such as a pocket or book once clamped is made of a hard material. It was possible to obtain a writing instrument that was not easily detached even when formed with the above.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a writing instrument according to a first embodiment.
FIG. 2 is an enlarged view of a main part of FIG. 1 with some parts omitted.
FIG. 3 is an enlarged view of a main part, partially omitted, showing a state in which a clip is held between held members.
FIG. 4 is a longitudinal sectional view of a writing instrument according to a second embodiment.
FIG. 5 is an enlarged view of a main part with a part omitted, showing a state in which a member to be held is held between clips.
[Explanation of symbols]
1, 21 Writing implement 2 Front shaft 2a Tip opening 3, 23 Rear shaft 3a, 23a Rear end 4, 24 Clip 4a, 24a Nipping part 5 Knock member 6 Rotating cam 7 Coil spring 8 Ink storage tube 9 Writing tip 10 Grip Members 11, 31 Stopper part L Maximum distance from the axis to the surface of the barrel at the position facing the holding part M Maximum distance from the axis to the surface of the stopper N Maximum distance from the axis to the grip member surface

Claims (2)

A writing instrument in which a clip is integrally formed or attached to a rear end portion of a barrel, and a clipping portion formed on an inner surface of the clip and a surface of the barrel facing the clamping section, a writing implement capable of clamping an object to be clamped. The shaft barrel is formed of a hard material on the surface of the barrel facing in the circumferential direction with respect to the surface of the barrel facing the clamping portion and the surface of the barrel facing the clamping portion. A stopper portion formed of a soft material is formed on the surface of the barrel at the rear end side of the barrel in the axial direction, and a maximum distance from the shaft center to the surface of the barrel at a position facing the holding portion formed on the inner surface of the clip. A writing implement characterized by satisfying L ≦ M, where L is the maximum distance from the axis to the surface of the stopper portion. A grip member made of a soft material is mounted on a grip portion of the barrel, and is formed so as to satisfy N <L when a maximum distance N from the axis to the surface of the grip member is set. Item 4. The writing implement according to Item 1.

Images