JP5151558B2 - Shaft body and writing instrument using the shaft body - Google Patents

Description

  The present invention relates to a shaft body formed by inserting and abutting one of two or more shaft cylinders to the other, and examples of the shaft body include writing instruments such as ballpoint pens and mechanical pencils, lipsticks, Examples include elongated containers such as eyeliners, tools such as fishing rods, door knobs, and drivers.

Prior to filing this application, the applicant of the present application stated that "in a shaft body formed by inserting and abutting one or more shaft cylinders into the other, at least one of the shaft cylinders is not transparent to laser light. Using a non-transparent resin as a material, at least one of the shaft cylinders that contact with the material is made of a transparent resin that is transparent to laser light, and welds the contact portion between the shaft cylinders by laser light irradiation. A shaft body in which a fine solid and / or an elastic resin and / or a viscous material are arranged between the shaft cylinders and / or in a space provided in the shaft cylinder while being joined. And filed.
Japanese Patent Application No. 2007-250718 (Application Date; September 27, 2007)

  As an example of the above-described invention, a through-hole is provided in a shaft tube made of a non-permeable resin serving as a lid, and an elastic resin and / or a viscous material is inserted through the through-hole. Here, when the viscosity of the elastic resin or viscous material is high to some extent, leakage from the through-hole is prevented, but when the viscosity is low, such as immediately after insertion, or low viscosity is maintained over time. In the case of the material, there is a risk of leakage from the through hole, leaving room for development.

Therefore, the present invention provides a shaft body formed by inserting and abutting one of two or more shaft cylinders into the other, and at least one of the shaft cylinders is made of a non-transparent resin that is not transparent to laser light. As a material, at least one of the shaft cylinders abutting on the material is made of a transparent resin that is transmissive to laser light, and the abutting portion between the shaft cylinders is welded by laser light irradiation and bonded, A fine solid and / or an elastic resin and / or a viscous material are arranged between the shaft cylinders and / or in a space provided in the shaft cylinder, and an injection part communicating with the non-permeable resin to the space part is provided. Forming a thin-walled portion that closes the injection portion, and forming a through-hole in the non-permeable resin, forming the thin-walled portion in the through-hole, and impermeable on the side opposite to the space A groove is formed on the surface of the conductive resin, and the groove It is an Abstract that allowed communicating the through-hole.

The present invention relates to a shaft body formed by inserting and abutting one of two or more shaft cylinders into the other, and at least one of the shaft cylinders is made of a non-transparent resin that is not transparent to laser light. In addition, at least one of the shaft cylinders that abut on it is made of a transparent resin that is transmissive to laser light, and the contact portions between the shaft cylinders are welded and joined by laser light irradiation. A fine solid and / or elastic resin and / or viscous material is disposed between each other and / or in a space provided in the shaft cylinder, and an injection portion that leads to the space portion is formed in the non-permeable resin. In addition, a thin-walled portion that closes the injection portion is provided, and a through-hole is formed in the non-permeable resin, and the thin-walled portion is formed in the through-hole, and the non-permeable resin on the side opposite to the space A groove is formed on the surface of the Since the hole was allowed communication, since even in the case of a conventional primer must use a strong elastic resin bonding has been difficult, the state in which both resins are entangled enter each other by melting is formed, a strong bond It constitutes a state and has high bonding strength and pressure resistance. In particular, an elastic resin often used as a gripping part has a problem of loosening due to swelling due to sweat. However, since both the resins are melted to realize strong welding, the problem is solved. In addition, since a sealed structure can be created by welding, the enclosure does not leak even if a fine solid and / or viscous material is placed in the space provided between the impermeable resin and / or the permeable resin. Is possible. Furthermore, leakage from the injection part of the non-permeable resin is also prevented.

  In the present invention, a contact portion between a shaft tube formed of a non-transparent resin that is not transmissive to laser light and a shaft tube formed of a transmissive resin that is transmissive to laser light is used for the laser light. It is characterized by being welded by irradiation and having a thin-walled portion provided in the non-permeable resin. We have made it possible to weld elastic resin, which has not been able to obtain strength and durability that can withstand use. Furthermore, a shaft body with an unprecedented tactile sensation has been realized by creatively inventing a sealed structure using strong welding.

  The shaft body may be formed by inserting one of two or more shaft cylinders into the other and contacting. At least one of the shaft cylinders is made of a non-transparent resin that is not transmissive to laser light, and at least one of the shaft cylinders that contacts the shaft cylinder is made of a transmissive resin that is transmissive to laser light. To do. Other shaft cylinders are not particularly limited as long as they can be used as a shaft body such as resin, wood, and stone. These materials may be one kind or a mixture of two or more kinds.

In the laser welding method, the laser light transmitted through the transparent resin material reaches the contact surface of the non-transparent resin material and is absorbed, and the laser light absorbed on the contact surface is accumulated as energy. As a result, the contact surface of the non-permeable resin material is heated and melted, and the contact surface of the transparent resin material is heated and melted by heat transfer from the contact surface of the non-permeable resin material. In this state, if the contact surfaces of the permeable resin material and the non-permeable resin material are pressure-bonded to each other, they can be joined together. In the joint portion thus obtained, the joining surfaces are melted and joined, and between the joining surfaces, both resins constituting both molded members are melted and are intertwined with each other. It has a strong bonding state and a high pressure strength by constituting a strong bonding state. For this reason, the contact portions of the shaft tubes need to be in close contact with each other when they are irradiated with laser. As means for close contact, there are methods such as applying pressure from the outside, screwing the shaft cylinders together, press-fitting, fitting by partial unevenness, and press-contacting one of the shaft cylinders by the elasticity using an elastic resin. However, there is no particular limitation as long as the abutting portions of the shaft cylinders that irradiate the laser are in pressure contact with each other. Since melting occurs only at the bonding interface (bonding surface), the surface is not immersed, and no appearance problems occur.

A specific configuration will be described below with reference to the drawings. It is the example which used this invention for the shaft of a writing instrument. The shaft body 1 includes a rear shaft 2, a front shaft 3 fixed to the front portion of the rear shaft 2, and a front member 4 detachably fixed to the front portion of the front shaft 3 by means such as screwing. It is configured. Reference numerals 5 and 6 are joint members interposed in a connecting portion between the rear shaft 2 and the front shaft 3, and the thickness of the rear shaft 2 due to a sudden increase in diameter is optimized. Inside the shaft cylinder 1, a lead feeding unit 7 for feeding the lead is disposed so as to be movable back and forth. The lead feeding unit 7 includes a lead tank 8 that stores a plurality of leads, a chuck body 9 that is fixed in front of the lead tank 8 and grips and releases the lead, and is surrounded by the front of the chuck body 9. A chuck ring 10 that opens and closes 9, a coil spring 11 that urges the core tank 8 and the chuck body 9 backward, and a rear end portion of the rear shaft 2 that is detachably attached to the rear end of the core tank 8. It is comprised from the knock member 12 which protruded from.
The outer periphery of the front shaft 3 is covered with a gripping portion 13 made of a bag-like permeable resin by integral molding or the like, and the rear end portion of the bag-like gripping portion 13 is impermeable resin. A ring-shaped lid body 14 made of is welded all around by the laser light irradiation. That is, the space 15 of the bag-shaped gripping portion 13 is sealed by the lid body 14. In the lid body 14, through holes 16 communicating with the space 15 and the outside are formed at two opposite positions, and a thin portion 17 is formed at the front end portion of the through hole 16 so as to close the through hole 16. Is formed. Moreover, although the groove part 18 whose cross section is circular arc shape is formed in the circular arc shape in the rear-end surface of the cover body 14, you may form in the periphery shape. The groove portion 18 communicates with the through hole 16. The thin-walled portion 17 formed in the through-hole 16 can be torn with a sharp tip such as an injection needle, but after being torn, it can be restored even though there is a break. It has become a thing. That is, when no external force is applied, the through hole 16 can be sealed.
A fine solid 19 and / or an elastic resin 20 and / or a viscous material 21 are enclosed in the space 15 of the grip 13.

The kind of resin and / or elastic resin used for the transmissive resin material (gripping part 13) is not particularly limited as long as it can transmit laser light as a heating source at a predetermined transmittance or higher. As the resin, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyethylene resin (PE), polypropylene resin (PP), polystyrene resin (PS), acrylonitrile styrene resin (AS), acrylonitrile styrene butadiene resin (ABS), Methacrylic resin (PMMA), polyacetal resin (POM), polyamide resin (PA) such as nylon 6 resin (PA6) and nylon 66 resin (PA66), polycarbonate resin (PC), polyethylene terephthalate resin (PET), polybutylene terephthalate (PBT), ethylene tetrafluoride resin (PTFE), elastic resins include acrylic resin, silicone resin, fluorine resin, vinyl chloride, urethane resin, polyurethane resin, polyethylene resin, elastomer gel, Reethylene gel, urethane rubber, ethylene acrylic rubber, epichlorohydrin rubber, acrylic rubber, ethylene propylene rubber, chloroprene rubber, natural rubber, isoprene rubber, chlorinated polyethylene, nitrile rubber, styrene elastomer, olefin elastomer, ester elastomer, urethane Although an elastomer etc. are mentioned, if a shape can be maintained, it will not specifically limit. These resins and / or elastic resins may be one kind or a mixture of two or more kinds.

  The hardness of the elastic resin may be appropriately selected within a hardness range of 0 to 90 degrees for Shore A or 0 to 90 degrees for Asker C, and is not particularly limited. However, an elastic resin of 60 degrees or less on Shore A and 80 degrees or more on Asker C becomes hard and less sticky or swells on the surface. Therefore, it is an elastic resin of 60 degrees or less on Shore A and 80 degrees or less on Asker C. It is desirable.

  The type of resin and / or elastic resin used for the non-permeable resin material (lid 14) is not particularly limited as long as it can absorb laser light as a heating source without transmitting it. As the resin, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyethylene resin (PE), polypropylene resin (PP), polystyrene resin (PS), acrylonitrile styrene resin (AS), acrylonitrile styrene butadiene resin (ABS), Methacrylic resin (PMMA), polyacetal resin (POM), polyamide resin (PA) such as nylon 6 resin (PA6) and nylon 66 resin (PA66), polycarbonate resin (PC), polyethylene terephthalate resin (PET), polybutylene terephthalate (PBT), ethylene tetrafluoride resin (PTFE), elastic resins include acrylic resin, silicone resin, fluorine resin, vinyl chloride, urethane resin, polyurethane resin, polyethylene resin, elastomer gel, Reethylene gel, urethane rubber, ethylene acrylic rubber, epichlorohydrin rubber, acrylic rubber, ethylene propylene rubber, chloroprene rubber, natural rubber, isoprene rubber, chlorinated polyethylene, nitrile rubber, styrene elastomer, olefin elastomer, ester elastomer, urethane Examples thereof include elastomers, and examples thereof include those in which a predetermined colorant such as carbon black, dye, pigment, or the like, which has sufficient absorbability for laser light, is mixed in a resin and / or elastic resin. In addition, an organic coloring material may be used as long as it exhibits sufficient absorbability with respect to laser light. Examples of such a coloring material include copper phthalodianine pigments.

  The combination of the resin used for the permeable resin material (gripping portion 13) and the resin used for the non-permeable resin material (lid 14) is a combination of compatible materials. Resins such as combinations of nylon 6 and nylon 66, combinations of PET and PC, combinations of PC and PBT, and combinations of styrene elastomer and polypropylene resin (PP) in addition to combinations of resins of the same type And a combination of elastic resins, and a combination of elastic resins such as a combination of an olefin elastomer and urethane rubber, but any combination of compatible resins may be used.

As the type of laser light used as a heating source, the transmittance in the transparent resin material is not less than a predetermined value in relation to the absorption spectrum and thickness (transmission length) of the transparent resin material that transmits the laser light. Those having such wavelengths are appropriately selected. For example, a YAG: Nd ³⁺ laser (laser light wavelength: 1060 nm) or a semiconductor laser (laser light wavelength: 500 to 1000 nm) can be used. Irradiation conditions such as laser output, irradiation density and processing speed (moving speed) can be set as appropriate according to the type of resin, the absorption capacity of the permeable resin material, and the like. If the output of the laser beam is low, it becomes difficult to melt the joint surfaces of the resin materials, and if the output is high, the resin material evaporates or changes in quality and the strength is lowered.

  The fine solid 19 is disposed between the front shaft 3 and the grip portion 13 and / or in a space 15 provided in the grip portion 13. Specific examples of the fine solid 19 include hard balls such as stainless steel, white and white, zirconia and ruby balls, ores such as diamond, ruby, sapphire, agate and quartz, rocks such as granite and marble, polyethylene, polyethylene terephthalate , Vinyl chloride, ABS, AS, PMMA, polypropylene, polycarbonate and other resins and their foams, acrylic resin, silicone resin, fluororesin, urethane resin, polyurethane resin, dimethyl silicone, methyl vinyl silicone, methyl phenyl vinyl silicone , Methyl fluoroalkyl silicone (fluorosilicone), fluoro-dimethyl copolymer silicone, urethane rubber, ethylene acrylic rubber, epichlorohydrin rubber, acrylic rubber, ethylene propylene rubber, chloroprene rubber, natural Rubber, isoprene rubber, chlorinated polyethylene, nitrile rubber, styrene elastomer, olefin elastomer, ester elastomer, urethane elastomer and other elastic resins, nylon, silk, cotton and other fibers, glass, etc. There is no particular limitation as long as the solid 19 can be formed. These fine solids 19 may be one kind or a mixture of two or more kinds.

  As the shape of the fine solid 19, various solid shapes such as particles, fibers, and irregular shapes can be used. When a fine solid having a shape close to a true sphere, such as a hard sphere, is arranged, the deformation is fast when gripped, and the shape is restored quickly when released. When an irregularly shaped fine solid obtained by pulverizing rocks or glass is arranged, the gripping is slow, but there is a feeling of gripping, and the shape is remembered to some extent when released. The size of the fine solid 19 varies depending on the size of the space 15, but is not particularly limited as long as it is smaller than the minimum width of the space 15. Further, the size of these fine solids 19 may be one kind or a mixture of two or more kinds.

  In addition to the fine solid 19 in the space 15 provided between the shaft body and the grip 13 and / or the space 15, the elastic resin 20 is used to assist the fluidity and shape retention of the fine solid 19. Alternatively, a gel material or a viscous material 21 may be provided. Examples of the viscous material 21 include silicone oils such as KF96 (manufactured by Shin-Etsu Chemical Co., Ltd.), silicone oil compounds such as tsk5370 (manufactured by Ge Toshiba Silicone), and petroleum oils such as Retinax Grease CL (manufactured by Showa Shell Sekiyu KK). Type grease. As gel-like substances, silicone gels such as KE-1052, sifel 827 (manufactured by Shin-Etsu Chemical Co., Ltd.), alpha gel (manufactured by Geltech Co., Ltd.), SilGel612 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), human skin gel ( Urethane gels such as those manufactured by Exeal Corporation are available.

Next, a method for enclosing the fine solid 19 and the elastic resin 20 (viscous material 21) in the space 15 will be described. First, a bag-like gripping portion 13 made of a permeable resin is integrally formed on the surface of the front shaft 3 by means such as injection molding. Next, a fine solid 19 is filled in the space 15 of the bag-shaped gripping portion 13. Next, a ring-shaped lid body 14 made of an impermeable resin is inserted from behind the front shaft 3 so as to be covered with the rear end portion of the grip portion 13. At this time, even if the fine solid 19 is smaller than the through hole 16, the thin portion 17 does not spill from the through hole 16.
Next, the grip portion 13 and the lid body 14 are welded by the laser welding. Thus, the bag-shaped gripping portion 13 is in a sealed state. Next, the viscous material 21 is inserted into the space 15 and is injected by an injection needle or the like. When the viscous material 21 is injected by the injection needle 22, the injection needle 22 is inserted from the through hole 16 of the lid body 14 (see FIGS. 5 and 6) and breaks through the thin portion 17. Here, the viscous material 21 is injected into the space 15 (see FIG. 7). When the injection needle 22 is pulled out from the through-hole 16 after the injection is completed, the thin-walled portion 17 returns to an almost original state by an elastic restoring force (see FIG. 8). While the injection needle 22 is pulled out, some viscous material 21 may adhere to the rear end surface of the lid 14 due to the thread pulling phenomenon or the like. Is stored in the groove 18.
In addition, when an external force such as a gripping force is applied to the gripping portion 13, the pressure of the viscous material 21 is applied to the thin portion 17, and as a result, the thin portion 17 further returns to the original state. As a result, leakage of the viscous material 21 and the like from the through-hole 16 is prevented.

  The present invention relates to a shaft body formed by inserting and abutting one of two or more shaft cylinders into the other. Examples of shafts include writing instruments such as mechanical pencils, ballpoint pens, correction pens, tools such as cutters and engraving swords, drivers, input pens used in PDAs (personal digital assistance) and electronic notebooks, bicycle handles, etc. Wide range.

The longitudinal cross-sectional view which shows one example of this invention. The principal part enlarged view of FIG. The principal part enlarged view of FIG. A-A line sectional view of FIG. The principal part longitudinal cross-sectional view which shows an injection | pouring process (just before injection needle insertion). The principal part enlarged view of FIG. The principal part longitudinal cross-sectional view which shows an injection | pouring process (at the time of viscous material injection | pouring). The principal part longitudinal cross-sectional view which shows an injection | pouring process (at the time of extraction of an injection needle).

DESCRIPTION OF SYMBOLS 1 axis | shaft main body 2 rear axis | shaft 3 front axis | shaft 4 tip member 5 joint member 6 joint member 7 core feeding unit 8 core tank 9 chuck body 10 chuck ring 11 coil spring 12 knock member 13 gripping part 14 lid body 15 space part 16 through-hole 17 Thin part 18 Groove part 19 Solid 20 Elastic resin 21 Viscous material 22 Injection needle

Claims (3)

In a shaft body formed by inserting and abutting one of the two or more shaft cylinders into the other, at least one of the shaft cylinders is made of a non-transparent resin that is not transmissive to laser light and abuts on the material. At least one of the shaft cylinders is made of a transparent resin that is transparent to laser light, and the abutting portions of the shaft cylinders are welded and bonded by laser light irradiation, and between the shaft cylinders and In addition, a fine solid and / or elastic resin and / or viscous material is arranged in a space provided in the shaft cylinder, and an injection portion that leads to the space portion is formed in the non-permeable resin, and the injection is performed. A thin-walled portion is provided to close the portion , a through-hole is formed in the non-permeable resin, the thin-walled portion is formed in the through-hole, and a groove is formed on the surface of the non-permeable resin opposite to the space The groove and the through hole are communicated with each other. Shaft, characterized in that was. The shaft according to claim 1, wherein the fine solid disposed in the space is in the form of particles and / or fibers. A writing instrument using the shaft according to claim 1.

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