JPH07299984A - Writing implement - Google Patents

Abstract

PURPOSE:To provide a writing implement so formed that a grip part can be easily adapted to a gripping convenience for an individual user. CONSTITUTION:A writing implement is composed of a holder barrel part 1 housing a writing unit 2 in its inside, a covering body 5 consisting of a flexible material fitted around the holder barrel part 1 so that a space part is formed between the holder barrel part 1 and its outside surface, and a liquid material 7 which is filled in a space part formed between the outside surface of the holder barrel part 1 and the coated body 5, and has fluidity at a room temperature. A surface of the coated body 5 is constructed as a gripping part. Therefore, at the same time when an user holds the writing implement, a liquid material flows, and the gripping part is deformed to a shape adapted for gripping convenience for an individual hand by a suitable viscosity of the liquid material 7 via the covering body 5 consisting of the flexible material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument in which a grip portion is adapted to a user's individual grip.

[0002]

2. Description of the Related Art In a conventional writing instrument, a shaft body has a cross section formed in a triangular shape, for example, so as to facilitate gripping or to form a groove on the surface of the shaft body to prevent the grip from slipping. For example, the surface of the shaft body is coated with a rubber member or wound to make a soft touch feeling. By making these improvements, the grip feeling, texture, etc. of the writing instrument are improved to some extent.

However, in the conventional writing instruments as described above, so-called "familiarity" does not occur with respect to the gripping condition of the individual user, and one step is left unsatisfactory in terms of usability. Therefore, for example, Japanese Patent Laid-Open No. 2-1
As disclosed in Japanese Patent Publication No. 08598, a shaft body of a writing instrument is made of, for example, low-temperature thermoplastic that softens at about 60 ° C., and the shaft body is heated and softened as necessary, and the shaft body is used. There has been proposed a device that can be shaped into a grip shape suitable for each person. According to this, the user individually softens the shaft body by, for example, immersing it in hot water, and shapes the shaft body in the softened state so that it can be adapted to the grip of the individual.

[0004]

By the way, in the above-mentioned conventional writing instrument, although it is made of a low-temperature thermoplastic which does not soften by human body heat and is softened at a relatively low temperature, In shaping the shape of the portion, it is necessary to prepare a hot water of at least about 60 ° C. or more, and to heat the shaft body portion by heating means. Moreover, in order to provide a grip shape that suits the individual user, it is inevitable that a shaping operation such as quickly grasping the shaft body portion with a bare hand while the shaft body portion is in a softened state is performed. Therefore, it is not suitable for infants and the elderly because it requires hot water and it is necessary to handle the barrel with bare hands while it is softened. Also, when shaping the shaft body, the entire writing instrument is heated at a considerable temperature, so it cannot be used for writing instruments that contain water-based ink. However, the ink may be adversely affected and the life of the ink may be shortened.

Further, although such a writing instrument can be shaped into a specific grip shape that suits the individual user, when another person tries to use it, on the other hand, it becomes extremely inconvenient and heats up each time. There is a technical problem that it is necessary to perform shaping.

The present invention has been made in order to solve such a conventional technical problem. No heat treatment is required for shaping the grip portion, and the grip portion can be easily adjusted according to the grip of the individual user. It is an object of the present invention to provide a writing instrument adapted to be suitable for.

[0007]

SUMMARY OF THE INVENTION A writing instrument according to the present invention, which has been made to achieve the above-mentioned object, is provided between a shaft barrel containing a writing unit therein and an outer surface of the shaft barrel. An outer casing made of a flexible material attached to the periphery of the shaft body so as to form a space, and a space formed between the outer surface of the shaft body and the outer cover. The basic structure is that it is made of a liquid substance having fluidity at room temperature, and the surface of the outer casing serves as a grip portion. Further, in the writing instrument according to the present invention, the outer cover is formed in a cylindrical shape, and both ends of the cylindrical outer cover are attached to the shaft body in a sealed state by sealing rings or by welding means. .

[0008]

In the writing instrument of the present invention, the outer body made of a flexible material forms a space between the outer surface of the shaft body and the liquid substance having fluidity at room temperature. Since the user holds the writing instrument at the same time, the liquid substance flows through the outer casing made of a flexible material at the same time, and the proper viscosity of the liquid substance causes the outer casing to be held by an individual's hand. It transforms into a shape suitable for the grip of. Further, the writing instrument according to the present invention is attached to the outer surface of the shaft body portion by a sealing ring or a welding means, whereby leakage of the liquid substance is surely prevented.

[0009]

Embodiments of the writing instrument according to the present invention will be described below with reference to the drawings. First, FIG. 1 shows a first embodiment of the present invention in a sectional view. The drawing shows a ballpoint pen as an example of a writing tool. Reference numeral 1 indicates a cylindrical shaft body, and one end of the shaft body 1 has a through hole 1a.
The writing unit 2 is housed in the shaft body 1 so as to be movable back and forth in the axial direction. The writing unit 2 is a well-known ball-point pen unit, in which ink is enclosed, and a ball 2a forming a pen tip at the tip.
Are arranged. When the unit 2 is in the advanced state, the tip of the unit 2 projects from the through hole 1a to be in use, and in the retracted state, the tip of the unit 2 is in the shaft body portion 1.
It retreats inside and is made into an unused state.

A guide groove 1b is formed in the other end of the shaft body portion 1 in the axial direction, and the operating rod 3 is provided in the guide groove 1b.
Are arranged so that they can be moved back and forth along the guide groove 1b. The operating rod 3 is formed of, for example, a synthetic resin into a bifurcated shape of a base portion 3a and a clip portion 3b, the base portion 3a is arranged in the shaft body portion 1, and the clip portion 3b is extended from the guide groove 1b portion to the outside. The clip portion 3b is extended, and at the tip of the clip portion 3b is formed a protruding portion 3c shaped like an edge.

A bifurcated slider 4 formed of, for example, a synthetic resin is attached to the base portion 3a of the operating rod 3. The slider 4 is arranged in the shaft body portion 1 together with the base portion 3a of the operating rod 3. Has been done. And the slider 4
Is accommodated in the shaft body 1 in a state where the two legs have elasticity in a direction of expanding each other, and the tip end of the first leg 4a thereof is outwardly oriented in a direction perpendicular to the axial direction. The engagement protrusion 4b is integrally formed, and the engagement protrusion 4b is selectively engaged with the first engagement hole 1c or the second engagement hole 1d formed in the shaft body 1 so as to be positioned. Is made. On the other hand, a unit mounting portion 4d is formed integrally with the tip of the second leg portion 4c of the slider 4 in the axial direction, and the tip of the ballpoint pen unit 2 is fitted to the mounting portion 4d.

Therefore, when the clip portion 3b is pressed in the direction of the shaft body portion 1, the arcuately shaped protrusion 3c is formed into the first engagement hole 1c or the second engagement hole formed in the shaft body portion 1. 1
the engaging projection 4b of the slider 4 engaged with the shaft body 1
The slider 4 is slidable in the shaft body 1 by being pushed inward. In this state, the operating rod 3 is moved back and forth along the guide groove 1b of the shaft body 1 so that the engagement protrusions 4b of the slider 4 move from the first engagement hole 1c formed in the shaft body 1 to the second engagement hole. 1d or from the second engagement hole 1d to the first engagement hole 1c
Can be selectively engaged with.

Therefore, the ball-point pen unit 2 attached to the slider 4 moves in the axial direction together with the slider 4, and in the forward state, the tip of the ball-point pen unit 2 projects from the through hole 1a of the shaft body 1 to be in use, and then retracted. In this state, the tip of the shaft is retracted into the shaft body 1 and is not used. On the other hand, on the outer surface of the shaft body 1, a cylindrical outer casing 5 made of a flexible material is attached by a sealing ring 6 so as to form a space with the shaft body 1. . The space portion is filled with a liquid substance 7 having fluidity at room temperature, and the surface of the outer casing 5 serves as a grip portion.

As shown in an enlarged view of the main part in FIG. 2, the outer surface of the shaft body 1 has a small diameter at a position constituting a grip portion, and a stepped portion 1e having a small diameter is formed. At both ends, for example, metal sealing rings 6 seal both ends of the outer casing 5, and the sealed space is filled with the liquid substance 7 having fluidity at room temperature as described above. ing.

Examples of the liquid substance 7 include water and glycols mixed with a preservative, or water-soluble polymers such as PVA (polyvinyl alcohol) and CMC (carboxymethylcellulose) for adding viscosity to the substance. -)),
CMCNa (carboxymethyl cellulose sodium), HEC (hydroxyethyl cellulose), or the like, or water and glycols with a preservative mixed, silica as an inorganic powder to further add viscosity. , Bentonite and the like, water and glycols mixed with a preservative, dimethylpolysiloxane (viscosity of 1 to 1,000,000 cps) and the like. These do not pass through the outer casing 5 and are inactive to the materials forming the outer casing 5 and the shaft body 1.

The material of the outer cover 5 is natural rubber, isoprene, styrene butadiene, chloroprene,
Flexible materials such as various rubbers such as nitrile, butyl, ethylene propylene, chlorosulfonated polyethylene, acrylic, epichlorohydrin polysulfide silicone, fluorine, urethane, and thermoplastic elastomer can be mentioned. Use the one formed in. The combination of the viscosity of the liquid substance 7 and the thickness of the outer casing 5 as described above forms a grip portion whose outer shape is appropriately changed according to how the individual holds the hand.

Several means are conceivable for filling the liquid substance 7 in the space formed between the outer surface of the shaft body 1 and the outer casing 5. For example, a method of previously forming an injection hole (not shown) in a part of the shaft body 1 and sealing the injection hole of the shaft body 1 after the injection of the liquid substance 7, or the method of sealing the sealing ring 6 With one attached, the liquid substance 7 is injected from the open portion of the other shaft body 1 and the outer casing 5,
A method of sealing the liquid substance 7 in the space portion by attaching the other sealing ring 6 in a state where an appropriate amount of the liquid substance 7 is injected may be considered.

FIG. 3 is an enlarged view of the essential parts of a second embodiment of the writing instrument according to the present invention. In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 indicate corresponding portions, and therefore detailed description thereof will be omitted. In the example shown in FIG. 3, both ends of the cylindrical outer casing 5 are attached to the shaft body 1 by welding means without using the sealing ring 6, and by the welding portion 8. The liquid substance 7 is sealed. In addition to the welding means, both ends of the outer cover 5 may be fixed to the shaft body 1 by an adhesive means.

[0019]

As is apparent from the above description, the writing instrument according to the present invention has the following features:
Since a space portion is formed between the outer surface of the shaft body portion and this space portion is filled with a liquid substance that has fluidity at room temperature, a flexible material is used at the same time when the user holds the writing instrument. The liquid substance flows through the outer casing made of. Then, due to the appropriate viscosity of the liquid substance, the grip portion is appropriately transformed into a shape adapted to the grip of an individual hand.
Therefore, the user's individual hand grip immediately becomes “familiar”, and a writing instrument with good usability can be provided. Moreover, it is possible to provide a highly safe product without the need to prepare hot water as described above, heat it by immersing it in the hot water, and quickly hold the shaft body with bare hands. .

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a writing instrument according to the present invention.

FIG. 2 is a cross-sectional view showing an enlarged main part of the writing instrument shown in FIG.

FIG. 3 is an enlarged cross-sectional view showing a main part of a second embodiment of a writing instrument according to the present invention.

[Explanation of symbols]

 1 Shaft Body 1a Through Hole 1b Guide Groove 1c First Engagement Hole 1d Second Engagement Hole 1e Step 2 Writing Unit 2a Ball 3 Operating Rod 3a Base 3b Clip 3c Projection 4 Slider 4a First Leg 4b Engagement Joint protrusion 4c Second leg portion 4d Unit mounting portion 5 Envelope 6 Sealing ring 7 Liquid substance 8 Welding layer

Claims (4)

[Claims] 1. A shaft body containing a writing unit therein, and a flexible material attached around the shaft body so as to form a space between an outer surface of the shaft body. Grip the outer surface of the outer body and a liquid substance that is filled in the space formed between the outer surface of the shaft body and the outer body and has fluidity at room temperature, and grips the surface of the outer body. Writing instrument characterized by being configured as a part. 2. The outer casing is formed in a cylindrical shape, and both ends of the cylindrical outer casing are attached to the shaft body by sealing rings. Writing instruments listed. 3. The casing according to claim 1, wherein the casing is formed in a cylindrical shape, and both ends of the cylindrical casing are attached to the shaft body by welding means. Writing instruments. 4. The liquid substance having fluidity at room temperature is inactive with respect to the substances constituting the casing and the shaft body portion without passing through the casing. The writing instrument according to items 1 to 3.