JP2010149455A - Cap fitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap fitting structure of a writing instrument, in particular, an expensive writing implement (e.g. a fountain pen), wherein an appropriate resistant feeling in fitting a cap to a shaft tube provides quiet fitting feeling with a high quality, the occupancy space of a component in the cap for the parts can be saved, the total length of the cap can be shortened, and there is no restriction on the design of the cap. <P>SOLUTION: The cap fitting structure slidingly holds the shaft tube by the fitting means fitting the cap to the shaft tube and an elastic part set to a mounting assist member 22 disposed in the cap. The mounting assist member 22 comprises an annular part and a reduced part 22b with a diameter gradually reduced from one end of the annular part 22a toward the center. The reduced part 22b is provided with a slit 22g, and a plurality of swingable tongue pieces 22c slidingly holding the shaft tube is formed in the cap fitting structure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cap fitting structure. Specifically, the present invention relates to a fitting means for fitting a cap and a shaft tube, and a cap fitting structure for slidingly gripping the shaft tube by an elastic portion provided on a mounting auxiliary member disposed in the cap.

Conventionally, in a cap fitting structure of a writing instrument, the cap, particularly a high-priced price writing instrument (for example, a fountain pen), has a thin plate spring having a shape as shown in FIG. A known so-called spring wig is provided. This spring wig has a plurality of elongated windows arranged in parallel on a rectangular sheet metal by punching. This is bent and rounded into a substantially circular or arc shape, inserted into the opening of the cap, and attached to the inner wall of the cap by an elastic biasing force (restoring force) toward the radially outer side of the rolled sheet metal. .
This spring wig has an inwardly bulging portion with a spring property, and a moderate feeling of resistance when fitting between the cap and the shaft tube provides a moist feeling with a high-class feeling, The shaft tube can be fixed to the cap so that there is no blur.
Japanese Utility Model Publication No. 6-24982

  However, in the spring wig, in order for the thin plate spring itself to exhibit the necessary elasticity, a certain length is necessary, and thus the cap itself necessarily requires a certain length. This is because the spring wig is the same as applying a force to the center of a thin leaf spring that supports both ends. In a thin plate spring having the same cross-sectional area shape, if the longitudinal dimension is short, the acting force becomes strong because of high rigidity. On the other hand, the acting force is reduced by increasing the longitudinal dimension. In order to apply an appropriate force (appropriate resistance when the cap and the shaft tube are fitted, which generates a bulging portion having springiness of a spring wig), it must be made appropriately long. Therefore, the length of the spring wig increases the length of the cap itself. Therefore, the cap was subject to design restrictions.

  The present invention is a cap fitting structure in which a shaft cylinder is slidably gripped by a fitting means for fitting a cap and a shaft cylinder, and an elastic portion provided in a mounting auxiliary member disposed in the cap, The auxiliary member includes an annular portion and a reduced diameter portion whose diameter gradually decreases from one end of the annular portion toward the center. The reduced diameter portion is provided with a slit, and the shaft cylinder is provided by providing the slit. The first gist is to form a plurality of swingable tongue pieces that slide and grip the second, and the second gist is to form an arcuate portion on the inner peripheral surface of the tongue piece in the attachment auxiliary member. In the mounting auxiliary member, the third gist is that the annular elastic member is fixed to the outer peripheral surface of the tongue piece.

  The present invention is a cap fitting structure in which a shaft cylinder is slidably gripped by a fitting means for fitting a cap and a shaft cylinder, and an elastic portion provided in a mounting auxiliary member disposed in the cap, The auxiliary member includes an annular portion and a reduced diameter portion whose diameter gradually decreases from one end of the annular portion toward the center. The reduced diameter portion is provided with a slit, and the shaft cylinder is provided by providing the slit. Since a plurality of swingable tongue pieces for sliding and gripping are formed, a high-class and moist fitting feeling can be obtained by an appropriate resistance feeling when fitting the cap and the shaft tube. Further, the mounting auxiliary member for obtaining a moist fitting feeling with a high-class feeling at the time of fitting may be shorter in length than a known spring wig that can obtain the same effect. Therefore, since the mounting auxiliary member saves space in the cap, the overall length of the cap can be shortened, and the cap has a fitting structure that is not subject to design restrictions.

Hereinafter, description will be given based on the drawings. 1 and 2 show an example in which the cap fitting structure of the present invention is applied to a water-based ballpoint pen. However, the present invention is not limited to this embodiment, and the present invention can also be adopted for a fountain pen, an oil-based ballpoint pen, and a mechanical pencil.
In the figure, the lower part is referred to as the rear and the upper part is referred to as the front.

A ballpoint pen refill 2 is disposed inside the writing instrument main body 1, and the ballpoint pen refill 2 is always urged forward by a resilient member 3 such as a coil spring. Reference numeral 4 denotes a tail plug fixed to the rear portion of the writing instrument body 1 by means such as press-fitting or screwing, and the elastic member 3 and the ballpoint pen refill 2 are prevented from falling off from the writing instrument body 1. . The tail plug 4 is made of a metal material, but it may be made of a resin material in consideration of reduction of parts cost and weight, and the surface of the resin material may be plated. It is not limited to a stopper. Most of the members that will be described later are made of a metal material, and surface treatment such as plating is applied to improve the corrosion resistance and appearance quality, but as with the tail plug, the cost of parts and the weight are reduced. In consideration of the above, it may be formed of a resin material, and the surface of the resin material may be plated.
In addition, the front member 5 is fixed to the front of the writing instrument body 1 by means such as screwing, bonding, or a combination thereof, but the ball pen refill 2 substantially has a front shaft 6 and a center shaft 7. It is detachably fixed by screwing.
A flange portion 6A is press-fitted and bonded to an intermediate portion of the front shaft 6, and the flange portion 6A, the middle shaft 7, and an end face of a decorative ring, which will be described later, serve as a screwing restricting portion. In addition, although the said collar part 6A is comprised by the separate body in this example, you may form integrally with the said front axis | shaft 6. FIG. The surface of the front shaft 6 is engraved. In addition to improving the aesthetics, it also has a non-slip effect as a grip.
The middle shaft 7 is fixed to an inner pipe 8 fixed to the inside of the writing instrument main body 1. The fixing means is fixed by press-fitting and also by adhesion. The outer shaft 9 fitted to the inner pipe 8 is made of a colored translucent resin material, while the inner pipe 8 is made of a non-transparent material made of a metal material. For example, the inner pipe 8 may be made of a resin material, but is preferably made of a non-transparent resin. By adopting a transparent material on the outer side and a non-transparent material on the inner side, a lens effect is generated in the writing instrument body 1, thereby obtaining a three-dimensional effect.

The center shaft 7 is covered with and bonded with a decorative ring 10 partially cut out, and an emblem 11 engraved with an emblem, a family crest, or a character is fitted into the hollow portion. And is fixed to the middle shaft 7 by adhesion. The decorative ring 10 is made of brass, while the emblem 11 is made of silver. By making each resonance frequency or hardness different, a good fitting sound (sound) can be obtained when a cap main body, which will be described later, is fitted to the writing instrument main body. In this example, brass and silver are combined. However, the present invention is not limited to this, and the same effect can be obtained as long as the metals have different resonance frequencies and / or hardnesses.
Reference numeral 12 denotes a holder that is press-fitted and fixed in front of the ballpoint pen refill 2, and the front end surface of the holder 12 is brought into contact with the inner stage of the tip member 5 to position the ballpoint pen refill 2 in front. There is no. The holder 12 is fixed so as to cover the air circulation hole 2A of the ballpoint pen refill 2. Even if an abnormal impact is applied to the writing instrument body 1 and a small amount of ink is scattered from the air circulation hole 2A, Since the scattered ink is hidden by the holder 12, a loss of appearance of the ballpoint pen refill 2 is prevented as much as possible. Reference numeral 13 denotes an O-ring made of an elastic body arranged on the inner surface of the tip member 5. From the tip of the ball-point pen refill 2 in a state in which a cap body to be described later is fitted to the writing instrument body 1 by the O-ring 13. In addition to preventing the ink from drying, it also prevents the side shake. Further, reference numeral 14 denotes a pit, which balances the front and rear of the writing instrument body 1 but is not necessarily required.

Next, the cap main body 15 detachably fitted in front of the writing instrument main body 1 will be described. An inner cylinder 17 is disposed inside the outer cylinder 16. A ring member 18 made of a metal material is fixed to the rear end portion of the inner cylinder 17 by means such as screwing and bonding. When the cap body 15 is fitted to the writing instrument body 1, the ring member 18 comes into contact with the decorative ring 10 of the writing instrument body 1, and emits a comfortable fitting sound such as “click”. A resin ring 18 </ b> A is disposed inside the ring member 18 to prevent the tip member 5 and the front shaft 6 from being damaged when the writing instrument body 1 is inserted obliquely with respect to the cap body 15. It is a shock absorbing member.
Here, the outer cylinder 16 is formed of a colored and transparent cylindrical member, and its thickness is 0.8 mm. However, the thickness is not limited to this example, and the thickness is 1.2 mm or 1. It is good also as 5 mm or 1.8 mm. However, if it is 2.0 mm or more, the effects (three-dimensional effect and depth feeling) that will be described later cannot be obtained. Examples of the material of the outer cylinder 16 include acrylic resin, polyurethane resin, acrylonitrile styrene copolymer, acrylonitrile butadiene styrene copolymer, and the like. The transmittance is 5% or more and 25% or less. It is a colored transparent synthetic resin material such as amber, blue, or brown sepia near black.
On the other hand, the inner cylinder 17 is formed of a metal material such as aluminum or brass, but may be formed of an opaque synthetic resin such as an acrylic resin, a polyurethane resin, an acrylonitrile styrene copolymer, or an acrylonitrile butadiene styrene copolymer. good. Further, if the material of the outer cylinder 16 is transparent or translucent, it may be made opaque by painting, plating, pattern printing, or the like.

In addition, a space of 0.05 mm or more is formed between the inner surface of the outer cylinder 16 and the outer surface of the inner cylinder 17, but if a space of 0.3 mm or less is formed, ruby, emerald, etc. It is possible to provide a shaft cylinder that can feel a three-dimensional feeling and a depth feeling while maintaining a transparent feeling like a precious stone. In order to express the three-dimensional effect and the sense of depth more, it is preferable that the outer cylinder has a color with high saturation and low brightness. Further, a space of 0.05 mm or more and 0.3 mm or less may be formed between the outer shaft 9 and the inner pipe 8. Similar effects can be obtained.
Further, the surface of the outer cylinder 16 or the outer shaft 9 is subjected to UV clear coating having high hardness. As a result, not only when used but also when placed on a desk or the like when not in use, scratches are hardly generated, and coating, plating, and pattern printing of the inner cylinder 17 can be clearly seen over a long period of time. Further, scratches caused by abutment between the protrusions 31 of the clip 28 described later and the surface of the outer shaft 16 (elastic contact of the protrusions 31 with the outer cylinder 16 by use) are prevented as much as possible by the clear coating. Furthermore, sliding scratches on the inner surface of the cap body 16 and the surface of the outer shaft 9 when the cap body 15 is inserted into the rear part of the writing instrument body 1 are prevented as much as possible.

An inner cap 19 made of a resin material that seals the tip of the ballpoint pen refill 2 is fixed to the inside of the inner cylinder 17 via a spring receiver 20. The middle cap 19 and the spring receiver 20 are fixed by screwing (screw portion 21) and adhesion so that the front and rear positions of the middle cap 19 with respect to the cap body 15 can be varied.
Among them, a mounting auxiliary member 22 is fixed to the rear part of the cap 19 by a method such as press fitting, bonding, welding, or a combination thereof. The mounting assisting member 22 has a shape as shown in FIG. 5 and includes an annular portion 22a and a reduced diameter portion 22b whose diameter gradually decreases from one end of the annular portion 22a toward the center. The reduced diameter portion 22b is formed with a slit 22g in the longitudinal direction, and a tongue piece portion 22c is provided by forming the slit 22g.
Although the slit 22g is illustrated as being formed along the longitudinal direction, it may be formed along the radial direction, or a combination thereof. In the present embodiment, four and three slits 22g are provided, but the present invention is not limited to this, and at least two slits may be provided. Further, the thickness of the annular portion 22a and the tongue piece portion 22c is more likely to swing when the tongue piece portion 22c is formed thinner, and a resistance feeling that leads to a cap fitting feeling described later is easily obtained. However, when the thickness is uniform, stable part molding can be expected, and defects can be reduced. In addition, when molding | wearing with the mounting | wearing auxiliary member 22 with resin, what is called molding defects, such as a sink and a short, can be prevented. Moreover, when forming with a metal, the wrinkle of a thickness change part can be prevented in the case of press work.
Further, the tongue piece portion 22c is formed to have a narrower width toward the tip, and the provision of an arc portion at the attachment portion to the annular portion 22a leads to improved durability.
By the way, it is better to arrange the mounting auxiliary member 22 as far back as possible with respect to the inner cylinder 17. By disposing behind, the vicinity of the square shape 22d in the inner peripheral portion of the tip of the tongue piece portion 22c quickly comes into contact with the outer peripheral surface of the shaft tube, so that it is easy to obtain a resistance feeling that leads to a cap fitting feeling described later.
The attachment assisting member 22 can be formed of a metal having a spring property. This selection is good from the viewpoint of durability. In this case, it is possible to prevent the shaft tube from being damaged by applying a surface treatment such as painting or resin coating to the surface. However, because of the ease of manufacturing, cost, and the point where the surface treatment process can be omitted, thermoplastic resins such as polypropylene, polyethylene, polyethylene terephthalate, acrylic butadiene styrene, polyacetal, polyamide, polybutylene terephthalate, and polycarbonate that can be elastically deformed Is preferable.

  A head crown core 23 is fixed to the front of the spring receiver 20 by a method such as screwing, press fitting, adhesion, or a combination thereof. A precious stone 24 such as a ruby for decoration is disposed in front of the crown core 23, and a crown 25 is disposed so as to cover the precious stone 24, and is screwed into the crown core 23. A precious stone 24 is sandwiched and fixed. Considering variation in the longitudinal dimension of the precious stone 24 and absorbing the variation, pinching / fixing by screwing is particularly effective. However, when the variation is large, a resin ring 26 is disposed behind the precious stone 24. May be interposed. The variation in dimensions is also absorbed by the deformation of the resin ring 26.

The clip mounting structure will be described in detail. A base end portion 28 is formed in a protruding state at the front portion of the clip 27, and a screw hole 29 is formed in the base end portion 28. Further, the bottom surface portion of the base end portion 28 is in contact with the outer peripheral surface of the spring receiver 20. Further, a protrusion 30 that contacts the outer cylinder 16 is formed behind the clip 27. Further, the base end portion 28 is formed with a curved arc portion 31 which becomes a fulcrum of movement when the clip 27 is operated. The arc portion 31 is formed so as not to damage the spring receiver 20 by repeatedly operating the clip 27. In other words, damage to the spring receiver 20 due to the corners, such as scratches and dents, is prevented, and the operability due to frictional resistance when the clip 27 is moved away from the outer cylinder 16 and returned is improved. ing. Further, by preventing damage and improving operability, a sufficient clip clamping force that is stable over time and durability is obtained.
The screw hole 29 is preferably formed in a state of being separated as far back as possible from the arc portion 31 that is a fulcrum of the clip 27 formed in the base end portion 28. Moreover, although the clip 28 of the present embodiment is formed of a material such as a die-casting or cutting material having rigidity such as a thick plate metal, the clip itself may have elasticity and resilience.

The spring receiver 20 is formed with through holes 32 and 33 penetrating coaxially. The through hole 33 is for inserting the elastic member 34 and the set screw 35 into the spring receiver 20. In this embodiment, the elastic member 34 is a coiled spring, but it may be a leaf spring, a rubber-like elastic body, or a combined elastic member. Here, the screw hole 29 of the clip 27 is aligned with the through hole 33, and the set screw 35 inserted into the spring receiver 20 is screwed and fixed to the screw hole 29 of the clip 27. By this fixing operation, the clip 27 is urged through the elastic member 34 disposed between the set screw 35 and the spring receiver 20, and as a result, the convex portion 30 moves in the direction of the outer cylinder 16. For example, the clip 27 can be separated from the outer cylinder 16 and returned to clamp a pocket of clothes, paper, or the like.
A clip support member 36 is fixed to the surface of the spring receiver 20, and a cutout portion 37 in which the base end portion 28 of the clip 27 is sandwiched is formed in the clip support member 36. This is a means for preventing the clip 27 from rattling against the cap body 15. And assembling as a clip unit is completed by assembling these. The clip support member 36 is preferably made of a material such as resin, and polyacetal (POM) having slipperiness is particularly preferable. The clip support member 36 and the spring receiver 20 are fixed by press-fitting, but the surface of the spring receiver 20 is finely knurled to improve the fixing force by the press-fitting. In particular, since POM is a difficult-to-adhere resin, it is preferable that the surface of the spring receiver 20 be knurled when temporarily bonded. Further, a through hole 38 having the same shape as the through hole 32 of the spring receiver 20 is formed at a location where the notch 37 of the clip support member 36 is opposed to the clip support member 36. The clamping force can be adjusted arbitrarily. Specifically, the front and rear positions of the set screw 35 can be arbitrarily moved.

Next, the fitting operation will be described.
FIG. 1 shows a state in which the cap body 15 is fitted to the writing instrument body 1. FIG. 2 is an enlarged view of the vicinity of the cap body 15, and the cap body 15 is detached from the writing instrument body 1. In this state, the mounting assisting member 22 maintains the initial state, and the tongue piece 22c is reduced in diameter toward the center.
FIG. 3 is also an enlarged view of the vicinity of the cap body 15 and is in a state immediately before starting fitting. In this state, the tongue piece 22 c of the mounting auxiliary member 22 is in contact with the outer peripheral surface of the tip member 5.
When the fitting is advanced, the tongue piece portion 22c of the mounting assisting member 22 is swung and bent by contacting and sliding on the outer peripheral surface in the order of the tip member 5 and the front shaft 6. Therefore, during this bending, the bending force that the tongue piece portion 22c tries to return to the initial state becomes elastic, and an appropriate resistance feeling is generated, and a high-quality fitting feeling and wearing feeling are obtained ( (See FIG. 4). Furthermore, the base of the tongue piece portion 22c may be formed in a hinge shape (not shown). By making it easier to swing, elasticity of bending can be obtained, and a sense of resistance leading to a high-quality fitting feeling can be expected.
Since the mounting assisting member 22 has a shape as shown in FIG. 5, it is the same as the cantilever principle. If the length of the tongue piece 22c in the longitudinal direction is long, the elasticity that generates resistance is weakened, and a high-class feeling cannot be obtained. Therefore, by shortening the length of the tongue piece 22c in the longitudinal direction, the elasticity is increased, and a high-quality and moderate resistance fit can be obtained. Accordingly, the total length of the mounting assisting member 22 can be shorter than that of a known spring wig (see FIG. 8) having a thin plate spring action in the prior art, so that the total length of the cap body 15 itself is also shortened. This also increases design freedom related to the overall length.
The tongue piece 22c is swingable and has a large amount of deformation. Therefore, when the shaft tube is slid and gripped, the outer diameter of the shaft tube is increased toward the front (in the case of front fitting) or rearward (in the case of rear fitting) even when the outer diameter shape of the shaft tube is straight. This can be dealt with even in the case of a smooth inclined surface in which the decrease is. Therefore, it is advantageous because the design of the barrel can be made free without being restricted.
However, when the reduced diameter portion 22b does not have a longitudinal slit 22g, and the shaft cylinder is slidably gripped in a circumferential shape without a tongue piece portion, the amount of deformation is small because it is not swingable. Therefore, if the shaft tube is straight, it can be slid and gripped, but if the shaft tube meets the inclined surface as described above, the distance that the circumferential portion can slide and grip is short. Therefore, when fitting the cap and the shaft tube, it is difficult to feel a moist fitting feeling with a high-class feeling due to appropriate resistance, and when writing vibration or the cap side is turned upside down (when rear fitting), There arises a problem that the cap is easily removed. Therefore, a configuration in which a slit 22g in the longitudinal direction is provided in the reduced diameter portion 22b and a tongue piece portion 22c is provided is adopted.
When the fitting is further advanced, the cap fitting is performed by the concave-convex coupling of the concave portion 5A of the tip member 5 and the convex portion 19a of the middle cap 19, and the cap main body 15 as shown in FIG. .

  FIG. 6 shows a mounting assisting member 22 which is a modification of the first embodiment. In the first embodiment, as shown in FIG. 5, the inner peripheral portion of the tip of the tongue piece 22c has a square shape 22d. In the middle of the fitting as shown in FIG. 4, the tongue piece 22c contacts and slides on the outer peripheral surface of the tip member 5 and the front shaft 6. Therefore, even if the material of the attachment auxiliary member 22 is resin, Depending on the type of surface treatment of the front member 5 and the front shaft 6, the occurrence of sliding scratches can be considered. Therefore, an arcuate portion 22E is formed on the inner peripheral surface of the tongue piece portion 22c so that sliding scratches do not occur on the shaft cylinder side such as the tip member 5 and the front shaft 6. Moreover, the effect that the insertion / extraction of the fitting operation is improved by the arc-shaped portion 22e can be expected.

  FIG. 7 shows the mounting assisting member 22 of the second embodiment. In the first embodiment, an appropriate resistance feeling is generated only by the swinging of the tongue piece portion 22C of the attachment assisting member 22, and the elasticity that brings about a feeling of fitting is obtained. Therefore, as the diameter of the cap main body 15 is small and, of course, as the diameter of the shaft cylinder is small, the swinging range of the tongue piece 22C is small, and the expected resistance may not be obtained. Therefore, an annular groove is formed in the outer peripheral surface 22F of the distal end of the tongue piece 22C, and the annular elastic member 39 is fitted and fixed in the groove. Thereby, when the elasticity of the annular elastic member 39 is not sufficient only by the swinging of the tongue piece 22C, there is an effect of assisting the insufficient elasticity. As the material of the annular elastic member 39, various synthetic rubbers, nitrile rubbers, hydrogenated nitrile rubbers, fluorine rubbers, silicone rubbers, ethylene propylene rubbers, chloroprene rubbers, acrylic rubbers, butyl rubbers, urethane rubbers, thermoplastic elastomers, etc. A deformable one can be used.

The longitudinal cross-sectional view which shows the 1st Example of this invention. Cap fitting state diagram. The principal part enlarged view of FIG. The figure before a cap fitting start. The principal part enlarged view of FIG. The figure just before a cap fitting start. The principal part enlarged view of FIG. FIG. The mounting auxiliary member of FIG. 1 is a perspective view. The attachment auxiliary member perspective view which shows the modification of 1st Example of this invention. The mounting auxiliary member perspective view showing the second embodiment of the present invention. The well-known spring wig perspective view provided with the effect | action of the thin-plate spring of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Writing instrument main body 2 Ball-point pen refill 2A Pen tip 3 Resilient member 4 Tail plug 5 Tip member 5A Recess 6 Front shaft 6A Collar portion 7 Middle shaft 8 Inner shaft 9 Decoration ring 11 Emblem 12 Holder 13 O ring 14 Vertical body 15 Cap body 16 Outer cylinder 17 Inner cylinder 18 Ring member 18A Resin ring 19 Middle cap 19A Convex portion 20 Spring receiver 21 Screw portion 22 Auxiliary member 22a Annular portion 22b Reduced diameter portion 22c Tongue piece portion 22d Square shape 22E Arc-shaped portion 22F Tip outer peripheral surface 22 g slit 23 crown core 24 precious stone 25 crown 26 ring 27 clip 28 base end 29 screw hole 30 convex portion 31 arc portion 32 through hole 33 through hole 34 repellent member 35 set screw 36 clip support member 37 notch 38 Through hole 39 annular elastic member

Claims (3)

A fitting means for fitting the cap and the shaft tube, and a cap fitting structure in which the shaft tube is slidably gripped by an elastic portion provided in the mounting aid member disposed in the cap, wherein the mounting aid member is annular. And a reduced diameter portion whose diameter gradually decreases from one end of the annular portion toward the center. The reduced diameter portion is provided with a slit, and by providing the slit, the shaft cylinder is slid and held. A cap fitting structure, wherein a plurality of swingable tongue pieces are formed. The cap fitting structure according to claim 1, wherein an arcuate portion is formed on an inner peripheral surface of the tongue piece in the attachment auxiliary member. The cap fitting structure according to claim 1, wherein an annular elastic member is disposed on the outer peripheral surface of the tongue piece in the attachment assisting member.

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