JP3024731B2 - Writing utensils - Google Patents

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 can be adapted to the gripping condition of an individual user.

[0002]

2. Description of the Related Art In a conventional writing instrument, a cross section of a shaft body is formed, for example, in a triangular shape so that a grip is easily devised, and a groove is formed on a surface of the shaft body to prevent slipping of the grip portion. The surface of the shaft body is coated with a rubber member or wound up for the purpose of giving a soft touch or a feeling of soft touch. By taking these measures, the gripping sensation and texture of the writing utensil are improved to some extent.

[0003] However, in the above-described conventional writing implement, so-called "familiarity" does not occur with respect to the gripping condition of the individual user, and there is a complaint about usability. Therefore, for example, Japanese Patent Laid-Open No. 2-1
As shown in JP 08598, the shaft body of a writing instrument is made of, for example, a low-temperature thermoplastic that softens at about 60 ° C., and if necessary, heats the shaft body to soften it and uses the shaft body. What can be shaped into a grip shape suitable for an individual is proposed. According to this, the user can soften the shaft body by, for example, immersing the body in hot water, and shape the shaft body in a softened state, so that the user can adapt to the gripping condition of the individual.

[0004]

By the way, in the above-mentioned conventional writing implement, although it is made of a low-temperature thermoplastic plastic which does not soften by human body heat and becomes soft at a relatively low temperature, the shaft barrel In shaping the shape of the part, it is necessary to prepare hot water of at least about 60 ° C. and to provide a heating means such as immersing the shaft body in the hot water. Moreover, in order to provide a grip shape suitable for an individual user, a shaping operation such as quickly grasping the shaft body with bare hands while the shaft body is softened is inevitable. Therefore, it is not suitable for infants, elderly people, etc. from the point of handling hot water and the point that it is necessary to handle the shaft body with bare hands while it is in a softened state. In addition, since the entire writing implement is heated at a considerable temperature when shaping the shaft body, it cannot be used for writing implements containing water-based ink. However, this may adversely affect the ink and shorten the life of the ink.

Further, in such a writing instrument, although it can be shaped into a specific grip shape suitable for the individual user, if another person tries to use the writing instrument, it becomes extremely inconvenient. There is a technical problem that it is necessary to perform shaping.

The present invention has been made to solve such a conventional technical problem, and does not perform a heating process in shaping the grip portion, so that the grip portion can be easily gripped by the user. It is an object of the present invention to provide a writing instrument adapted to conform to the above.

[0007]

According to a first aspect of the present invention, there is provided a writing instrument comprising: a shaft body in which a writing unit is housed; and an outer surface of the shaft body. A jacket made of a flexible material attached around the shaft body to form a space, and filling a space formed between the outer surface of the shaft body and the housing body. It has a basic configuration in that it is made of a liquid material having fluidity at room temperature, and the surface of the envelope is a grip portion. In the writing instrument according to the present invention, the outer casing is formed in a cylindrical shape, and both ends of the cylindrical outer casing are attached to the shaft body in a sealed state by a sealing ring or by welding means. .

[0008]

According to the writing instrument of the present invention, a space is formed between the outer surface of the shaft body and the outer surface of the shaft body by a jacket made of a flexible material, and a liquid material having fluidity at room temperature is formed in the space. As the user grasps the writing instrument, the liquid material flows through the outer cover made of a flexible material, and the liquid material flows with an appropriate viscosity. Deformed into a shape that is adapted to the grip. Further, the writing implement according to the present invention is attached to the outer surface of the shaft body by a sealing ring or welding means, whereby leakage of the liquid substance is reliably prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a writing instrument according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of the present invention. The drawing shows a ballpoint pen as an example of a writing instrument, 1 denotes a cylindrical shaft body, and one end of the shaft body 1 has a through hole 1a.
The writing unit 2 is accommodated in the shaft body 1 so as to be able to advance and retreat in the axial direction. The writing unit 2 is a well-known ballpoint pen unit, in which ink is sealed, and a ball 2a forming a pen tip is provided at the tip.
Is arranged. When the unit 2 is in the forward state, the tip of the unit 2 projects from the through hole 1a to be used, and in the retracted state, the tip of the unit 2 is
Retreats into and is made non-use state.

A guide groove 1b is formed in the other end of the shaft body 1 in the axial direction.
Are arranged to be able to advance and retreat along the guide groove 1b. The operating rod 3 is formed in a bifurcated shape of a base 3a and a clip 3b by, for example, a synthetic resin. The base 3a is arranged in the shaft body 1, and the clip 3b extends from the guide groove 1b to the outside. The clip 3b is extended, and a protruding portion 3c is formed at the tip of the clip portion 3b.

A bifurcated slider 4 molded of, for example, synthetic resin is attached to the base 3a of the operating rod 3, and the slider 4 is disposed in the shaft body 1 together with the base 3a of the operating rod 3. Have been. And the slider 4
Is housed in the shaft body 1 in a state where the two legs have elasticity in a direction in which the two legs are expanded, and the distal end of the first leg 4a is directed outward in a direction perpendicular to the axial direction. An engagement projection 4b is formed integrally, and this engagement projection 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 done. On the other hand, a unit mounting portion 4d is formed integrally with the distal end of the second leg 4c of the slider 4 in the axial direction, and the distal end 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 1, the protrusion 3c formed in an arc shape is engaged with the first engagement hole 1c or the second engagement hole formed in the shaft body 1. 1
d, the engaging projection 4b of the slider 4 engaged with the shaft body 1
, The slider 4 is slidable in the shaft body 1. In this state, the operating rod 3 is advanced and retracted along the guide groove 1b of the shaft body 1, so that the engagement protrusion 4b of the slider 4 is moved 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.

Accordingly, the ball-point pen unit 2 attached to the slider 4 moves in the axial direction together with the slider 4, and in a forward state, its tip protrudes from the through-hole 1a of the shaft body 1 to be used, and is retracted. In this state, the distal end is retracted into the shaft body 1 and is set in a non-use state. On the other hand, a cylindrical casing 5 made of a flexible material is attached to the outer surface of the shaft body 1 by a sealing ring 6 so as to form a space with the shaft body 1. . The space is filled with a liquid material 7 having fluidity at normal temperature, and the surface of the envelope 5 is configured as a grip.

As shown in an enlarged view of a main part in FIG. 2, the outer surface of the shaft body 1 is formed to have a small diameter at a position constituting the grip portion, and a step 1e having a small diameter is formed. At both ends, for example, a metal sealing ring 6 seals both ends of the envelope 5, and the sealed space is filled with the liquid material 7 having fluidity at normal temperature as described above. ing.

The liquid substance 7 is prepared by mixing a preservative into water and glycols, or PVA (polyvinyl alcohol) or CMC (carboxymethyl cellulose) as a water-soluble polymer in order to add viscosity to the substance. −S),
CMCNa (sodium carboxymethylcellulose), HEC (hydroxyethylcellulose), or a mixture of water and glycols with a preservative, silica as inorganic powder to further increase viscosity , Bentonite or the like, or a mixture of water and glycols with a preservative, or dimethylpolysiloxane (viscosity of 1 to 1,000,000 cps). These do not penetrate the casing 5 and are inert to the material forming the casing 5 and the shaft body 1.

The material of the casing 5 includes natural rubber, isoprene, styrene butadiene, chloroprene,
Flexible materials such as nitrile, butyl, ethylene propylene, chlorosulfonated polyethylene, acrylic, epichlorohydrin polysulfide silicone, fluorine, urethane and other rubbers, and thermoplastic elastomers can be used. Use the one formed in By the combination of the viscosity of the liquid material 7 and the thickness of the jacket 5 as described above, a grip portion whose outer shape is appropriately changed in accordance with the gripping condition of the hand of an individual is formed.

In order to fill the space formed between the outer surface of the shaft body 1 and the jacket 5 with the liquid material 7, several means are conceivable. For example, a hole for injection (not shown) is provided in advance in a part of the shaft body 1, and the injection hole of the shaft body 1 is sealed after the liquid substance 7 is injected, or With one attached, a liquid substance 7 is injected from the open part of the other shaft body 1 and the jacket 5,
A method of sealing the liquid material 7 in the space by attaching the other sealing ring 6 with an appropriate amount of the liquid material 7 injected is conceivable.

FIG. 3 is an enlarged view of a main part 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 denote corresponding parts, and a detailed description thereof will be omitted. In the example shown in FIG. 3, both ends of the cylindrical casing 5 are attached to the shaft body 1 by welding means without using the sealing ring 6, The liquid material 7 is sealed. In addition, both ends of the outer cover 5 may be fixed to the shaft body 1 by an adhesive means other than the welding means.

[0019]

As is apparent from the above description, the writing instrument according to the present invention is made up of an outer cover made of a flexible material.
A space is formed between the outer surface of the shaft body and the space, which is filled with a liquid material having fluidity at room temperature, so that the user can grasp the writing instrument and simultaneously use the flexible material. The liquid substance flows through the envelope made of the liquid. Then, the grip portion is appropriately deformed in each case by the appropriate viscosity of the liquid material to a shape adapted to the gripping condition of the individual's hand.
Therefore, the user is immediately familiar with the gripping condition of the hand of the user, and a writing instrument that is easy to use can be provided. Moreover, it is not necessary to prepare hot water as described above, heat it by immersing it in the hot water, and perform a shaping operation such as quickly holding the shaft body with bare hands, thereby providing a highly safe product. .

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view showing a main part of the writing instrument shown in FIG. 1;

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

[Explanation of symbols]

 Reference Signs List 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 portion 3c protrusion 4 slider 4a first leg 4b Joint projection 4c Second leg 4d Unit mounting part 5 Outer body 6 Sealing ring 7 Liquid substance 8 Welding layer

Claims (4)

(57) [Claims] 1. A flexible body attached around a shaft body so as to form a space between the shaft body housing a writing unit therein and an outer surface of the shaft body. An outer body, which is filled in a space formed between the outer surface of the shaft body and the outer body and is made of a liquid material having fluidity at room temperature, and grips the surface of the outer body. A writing implement characterized by comprising as a part. 2. The method according to claim 1, wherein the outer casing is formed in a cylindrical shape, and both ends of the cylindrical outer casing are attached to the shaft body by a sealing ring. Writing instrument as described. 3. The cylindrical body according to claim 1, wherein the cylindrical body is formed in a cylindrical shape, and both ends of the cylindrical body are attached to the shaft body by welding means. Writing utensils. 4. A liquid material having fluidity at room temperature without passing through the jacket and being inert to substances constituting the jacket and the shaft body. Item 4. The writing implement according to any one of Items 1 to 3.