JP2006305736A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing utensil which is free from an abrasive scratch to be generated on the outer peripheral surface of a writing utensil body when a cap is fitted to the outer peripheral surface of a tail end side of the main body, during using the writing utensil, and gives a comfortable feeling to a hand when fitting the cap. <P>SOLUTION: In the writing utensil which has the cap to be fitted to the tail end side of the writing utensil body 10, the outer peripheral surface 10a of the main body 10, to which the cap is fitted, is gently tapered and an annular elastic member 25 formed of an elastomer is stuck fast to a matching aperture side inner peripheral surface 20 of a cap main body 20. Further, when the cap is fitted to the tail end side of the writing utensil body 10, the annular elastic member 25 is fitted to the gently tapered surface of the tail end side outer periphery of the writing utensil body 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a writing instrument in which a cap can be attached to the tail end side of a writing instrument body during writing.

  For example, a writing instrument that uses water-based ink, such as a fountain pen, often seals the pen with a cap to prevent ink evaporation when not writing, but when writing the cap is attached to the tail end of the writing instrument body. Since it is not necessary to search for a cap at the end of writing and it is convenient and convenient, it is often designed so that the cap can be mounted on the tail end side of the writing instrument body. For this reason, in a fountain pen, etc., a structure is adopted in which the outer peripheral surface on the tail end side of the writing instrument body and the inner peripheral surface on the abutment side of the cap body are gently tapered surfaces, and the tapered surfaces are fitted and mounted. Many.

  In writing instruments such as fountain pens, the writing instrument main body and the cap main body are often formed of acrylic resin, etc., but in the writing instrument in which the aforementioned tapered surfaces fit together, the cap is attached to the tail end side of the writing instrument main body. Since the outer peripheral surface of the writing instrument main body and the inner peripheral surface of the cap main body slide relative to each other when removed, the outer peripheral surface of the writing instrument main body is easily scratched. In particular, when inserting or pulling the cap into the tail end of the writing instrument body, there is a tendency to insert or withdraw the cap while rotating it slightly, but if the roundness of the writing instrument body or cap body is insufficient, it will rotate. Along with this, scratches are likely to occur. And, when the outer peripheral surface of the writing instrument body is scratched, there is a problem that it looks very unsightly. Especially in the case of ultra-high-grade fountain pens, there are cases where the outer peripheral surface of the writing instrument body is painted, etc., but in this case the outer peripheral surface is not smooth, so it is easy to scratch when attaching or removing the cap. This scrape becomes a fatal defect. Further, since the synthetic resin of the writing instrument body and the cap body are rubbed together at the time of wearing, there is a problem that the feeling of wearing the cap is not preferable. And in the fitting of synthetic resins, friction resistance is small, and a cap may fall off from the tail end of a writing instrument main body unexpectedly.

  Therefore, the present invention provides a writing instrument in which the outer peripheral surface of the writing instrument body is not rubbed when the cap is attached to the outer peripheral surface of the writing instrument body during non-writing, and the feeling at the time of mounting is also preferred. For the purpose.

  In order to achieve such an object, the present invention provides a writing instrument in which the cap can be mounted on the tail end side of the writing instrument body, and the tail end side outer peripheral surface of the writing instrument body to which the cap is mounted has a gently tapered surface. An annular elastic member made of elastomer is fixed to the inner peripheral surface of the main body of the main body, and when the cap is attached to the tail end side of the writing instrument main body, the annular elastic member is attached to the gently tapered surface of the outer peripheral side of the writing instrument main body. Fit.

  When the cap is attached to the tail end of the writing instrument body, the elastomeric ring elastic member fits while sliding on the gently tapered surface on the outer periphery of the writing instrument body. In addition, the writing instrument can be a preferable writing instrument. And since the cyclic | annular elastic member which consists of elastomers has a large frictional resistance with the outer peripheral surface of the writing instrument main body which consists of synthetic resins, a cap does not fall off from the tail end of a writing instrument main body unexpectedly.

  The drawing shows an example in which the present invention is applied to a fountain pen. In FIG. 1, the writing instrument main body 10 is formed of an acrylic resin into a substantially bottomed cylindrical shape, and the tail end side outer peripheral surface 10a is a gently tapered surface. It has become. A front end 12 is fixed to a front end opening of the writing instrument main body 10, and a pen body 13 projects from the front end 12. A thread groove 11 is formed at the tip of the writing instrument body 10. An ink cartridge (not shown) is accommodated in the writing instrument main body 10, and water-based ink in the ink cartridge is supplied to the pen body 13 for writing.

  The cap main body 20 is also molded into a cylindrical shape with acrylic resin, the abutment side inner peripheral surface 20a is also a gently tapered surface, and a thread groove 24 is formed at the tip thereof. An annular concave groove is formed on the abutment side inner peripheral surface 20a, and an annular elastic member 25 formed of an olefin-based elastomer is fitted into the concave groove and fixed in a state. The surface of the annular elastic member 25 protrudes slightly from the abutment side inner peripheral surface 20a in a free state. An inner cap 23 is disposed in the cap body 20. Further, the clip 22 is fixed to the cap body 20 by the tail plug 21.

When not writing, as shown in FIG. 1, when the screw groove 1 of the writing instrument body 10 and the screw groove 24 of the cap body 20 are screwed together, the tip edge of the inner cap 23 abuts the tip surface 12 a of the tip 12. Then, the pen body 13 is sealed to prevent evaporation of the ink.
Next, when writing, when the cap is removed and inserted into the tail end side of the writing instrument body 10, as shown in FIG. 2, the annular elastic member 25 is slid and fitted to the tail end side outer peripheral surface 10a. At this time, since the annular elastic member 25 is formed of an elastomer, the circularity of the writing instrument body 10 and the cap body 20 is not sufficient. The tail end side outer peripheral surface 10a can only be rubbed. Moreover, compared with the case where synthetic resins, such as an acrylic resin, slide, the feeling at the time of mounting | wearing is favorable. And since the frictional resistance between the tail end side outer peripheral surface 10a and the annular elastic member 25 is also large, it is possible to prevent the cap from accidentally falling off due to a large fitting force.

It is the front view which notched a part at the time of non-writing of the Example of this invention. It is the front view which notched a part at the time of writing of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Writing instrument main body 10a Tail end side outer peripheral surface 11 Thread groove 12 Tip port 13 Pen body 20 Cap body 20a Mouth side inner peripheral surface 21 Tail plug 22 Clip 23 Inner cap 24 Screw groove 25 Annular elastic member

Claims (1)

In writing instruments that can be attached to the tail end side of the writing instrument body,
The outer peripheral surface on the tail end side of the writing instrument main body to which the cap is attached is a gently tapered surface, and an annular elastic member made of elastomer is fixed to the inner peripheral surface of the cap main body to the tail end side of the writing instrument main body of the cap. A writing instrument, wherein the annular elastic member is fitted to a gently tapered surface on the outer periphery of the tail end side of the writing instrument main body when mounted.

Images