JPH0516381U - Writing instrument cap - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the inner volume of the inner cylinder placed in the lid is reduced to suppress the vacuum effect, the pen may be damaged or the cap may not be completely fitted. Not provide a cap for writing instruments. [Structure] The pen 10 of the writing instrument main body is made of a highly flexible synthetic resin in the lid 10 fitted to the writing instrument main body 30.
In the cap for a writing instrument in which the inner cylinder 20 that covers and seals the inner cylinder 20 is arranged, the inner cylinder 20 has a small inner volume, the gap between the inner surface and the pen body 32 is very small, and the inner cylinder 10 has a deep inner portion. Form 21 thinly so that it will deform when the pen 32 hits it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a writing instrument cap in which an inner cylinder disposed in a lid body covers and seals a pen body of a writing instrument body.

[0002]

[Prior art and its problems]

 A cap for a writing instrument that uses water-based ink has the function of preventing the ink from evaporating from the pen body of the writing instrument body when not in use, and protecting the pen body. For this reason, in many cases, an inner cylinder made of synthetic resin is arranged in the lid body, and when the lid body is fitted into the front opening of the writing instrument main body, the inner cylinder covers and seals the pen body. In such a cap, when the cap is removed from the writing instrument main body for writing, there is a time lag between the moment the inner cylinder moves and the outside air enters the inner cylinder, so the effective inner volume of the inner cylinder increases and the inner cylinder's internal volume increases. Is decompressed and the vacuum effect works. On the other hand, a writing instrument that uses water-based ink uses a "filler type" that absorbs the ink in an ink absorber made of ultra-fine fibrous material and transmits this ink to the pen body via a relay core, and the ink in the ink cylinder. The ink is roughly divided into "raw ink type" which is transmitted to the pen body via a pen core having an ink holding function. In the case of "raw ink type", the ink is pulled out from the ink cylinder when the vacuum effect works. It is retained in the pen core. Then, if the cap is repeatedly attached and detached, the amount of the ink drawn out exceeds the ink holding capacity of the pen core, and the ink “drops off”.

In order to suppress this vacuum effect, it is effective to reduce the inner volume of the inner cylinder. On the other hand, there are variations in the length of the pen protruding from the tip and the size of the inner cylinder.However, if the inner volume of the inner cylinder is reduced to reduce the gap between the inner surface of the inner cylinder and the pen, When the length varies to the longer side, the tip may come into contact with the bottom surface of the inner cylinder, causing damage to the tip of the pen and imperfect fitting of the cap.

[0004]

[The purpose of the device]

 Therefore, the present invention aims to provide a writing instrument cap that does not damage the pen or incompletely fit the cap even if the inner volume of the inner cylinder is reduced to suppress the vacuum effect. To aim.

[0005]

[Constitution of the device and its action]

 The structure of the present invention is a cap for a writing instrument in which an inner cylinder made of a highly flexible synthetic resin is arranged in the lid body fitted to the writing instrument body to cover and seal the pen body of the writing instrument body. The inner cylinder has a small inner volume and has a very small gap between the inner surface and the pen body, and the inner bottom portion of the inner cylinder is thinly formed and deforms when the pen body hits. ..

That is, since the inner volume of the inner cylinder is made small, the vacuum effect can be suppressed, but the inner cylinder made of a synthetic resin having high flexibility is thinly molded so that it deforms when the pen body hits it. Since the pen body is not damaged, the cap can be completely fitted to the writing instrument main body.

[0007]

【Example】

 The present invention will be described in detail below with reference to the embodiments shown in the drawings. In FIG. 1, the writing instrument main body 30 is a “raw ink type” marker that uses a water-based ink, and a tip 31 having an annular locking protrusion 32 is attached to the tip of the writing instrument main body 30. Then, a rod-shaped pen body 32 having an ink passage hole therein is projected from the front opening 31. Here, the projected length of the pen body 32 is 5.5 mm by design, but there is some variation.

Next, the structure of the cap will be described. The lid 10 fitted to the writing instrument main body 30 is a bottomed cylindrical body made of synthetic resin and has an annular locking groove 11 on its inner peripheral surface. , Engages with the locking projection 32 of the front opening 31. Although the inner cylinder 20 is arranged inside the lid 10, the inner volume of the inner cylinder 20 is small, and the inner surface of the inner cylinder 20 and the pen body 32 when the lid 10 is fitted to the front opening 31. The gap is very small, and the designed gap between the tip of the pen body 32 and the bottom surface 21 of the inner cylinder 20 is 0.5 mm. Therefore, the vacuum effect is small, and even if the cap is repeatedly attached and detached, the ink is less likely to “blot”. The inner cylinder 20 is made of a highly flexible synthetic resin such as nitrobutylene rubber or silicone rubber, and the inner bottom including the bottom 21 has a wall thickness of, for example, 0.2 mm, which is thinner than other parts. It has become.

Then, when the lid 10 is fitted into the writing instrument main body 30, the locking groove 11 engages with the locking projection 32 of the front end 31, and the end edge 22 of the inner cylinder 20 comes to the end face of the front end 31. Abut. That is, the inner cylinder 20 covers and seals the pen body 32. At this time, although there is a gap between the tip of the pen body 32 and the bottom surface 21 of the inner cylinder 20 in the design, the protruding length of the pen body 32, the size of the inner cylinder 20, the locking groove 11 and the locking projection 32 are set. The tip of the pen body 32 may hit the bottom surface 21 of the inner cylinder 20 due to the position variation. However, even if it hits, the inner bottom portion including the bottom surface 21 has a small thickness, so that the inner bottom portion of the inner cylinder 20 is easily deformed. Therefore, the tip of the pen body 32 is not damaged, and the lid body 10 can be fitted into the writing instrument body 30 completely.

[0010]

[Effect of the device]

 As described above, the writing instrument cap of the present invention is made of a highly flexible synthetic resin, has a small inner volume, and has a thin vacuum effect on the inner bottom portion of the inner cylinder to reduce the vacuum effect. Since it is deformed, the pen body is not damaged and the cap can be completely fitted to the writing instrument main body.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

[Explanation of symbols]

 10 Lid 11 Locking Groove 20 Inner Cylinder 21 Bottom 30 Writing Instrument Main Body 31 Tip Port 32 Pen Body 33 Locking Protrusion

Claims (1)

[Scope of utility model registration request] 1. A writing instrument cap in which an inner cylinder made of a highly flexible synthetic resin and arranged to cover and seal the pen body of the writing instrument main body is arranged in a lid fitted to the writing instrument main body, Is a writing instrument cap characterized in that the inner volume is small, the gap between the inner surface and the pen body is very small, and the inner bottom portion of the inner cylinder is thinly formed so that it deforms when the pen body hits.