JPH0639485U - Writing instrument cap - Google Patents

Abstract

(57) [Summary] [Structure] A cap of a writing instrument comprising an inner cap 8 and an outer cap 1. A main body A is inserted into an inner hole 9 of the inner cap 8.
The sealing circumferential projection 11, the front fitting projection 12, and the rear fitting projection 13 are sequentially provided toward the opening end side, and at the portion where these projections are located, the outer wall of the inner cap 8 A gap 15 is provided between the inner wall of the outer cap 1 and a trumpet-shaped core diameter portion at the open end portion of the inner cap 8 to form the gap 1
5 is not exposed at the open end of the inner cap 8. [Effect] Even if all of the circumferential projection for sealing, the front fitting projection, and the rear fitting projection must be separately provided in the inner hole of the inner cap due to design restrictions, The fitting force at the mating projection and the rear fitting projection can be reliably exerted for a long period of time.Also, even if the total length of the inner cap becomes long, the pen tip collides with the open end of the inner cap. Can be prevented as much as possible.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a writing instrument cap including an inner cap and an outer cap.

[0002]

[Prior art]

 In many cases, the inner hole of the cap of writing instruments such as fountain pens, ball pens, small-tube writing instruments, fiber pens, writing brushes, makeup tools, and handwriting correction instruments is provided with appropriate protrusions for different purposes. There is. First, the front fitting protrusion, that is, the protrusion as a fitting portion for preventing the cap from falling off when the cap is attached to the front side of the main body to protect the pen tip, and then the rear fitting protrusion. Part, that is, the protrusion as a fitting part for preventing the cap from being detached when the cap is attached to the rear side of the main body at the time of use or exhibition, and next, the sealing circumferential protrusion, That is, it is a sealing protrusion that comes into circumferential contact with the main body to prevent the ink from drying.

It is extremely convenient for the cap to be composed of an inner cap and an outer cap in view of setting the fitting force and sealing property of these protrusions. That is, if a relatively hard material is selected for the outer cap and a front fitting projection or a rear fitting projection is provided in the inner hole of this outer cap, a reliable fitting force can be easily obtained. By selecting a relatively soft material for the inner cap and providing a sealing circumferential protrusion in the inner hole of this inner cap, good sealing performance can be easily obtained. However, in practice, instead of separately providing the front fitting protrusion and the rear fitting protrusion on the outer cap, one fitting protrusion is provided, and this protrusion is used for front fitting and rear fitting. Shared with.

[0004]

[Problems to be solved by the device]

 However, due to design requirements, it is not possible to provide a front fitting projection or a rear fitting projection on the outer cap while the cap is made up of an inner cap and an outer cap. In some cases, the rear mating protrusions must be provided separately. In the inner hole of the inner cap, the sealing circumferential projection, the front fitting projection, and the rear fitting projection are all separately provided. In this case, first, the fitting force at the front fitting projection and the rear fitting projection must be made as good as possible, and in addition, the length of the inner cap must be long because these projections must be provided separately. It should be noted that the pen tip easily collides with the open end of the inner cap because it tends to occur.

[0005]

[Means for Solving the Problems]

 A sealing peripheral projection, a front fitting projection, and a rear fitting projection are sequentially provided in the inner hole of the inner cap toward the opening end side, and at the portion where these projections are located, the outer wall of the inner cap is formed. A gap shall be provided between the inner wall of the outer cap and this gap and shall not be exposed at the open end of the inner cap. That is, the present invention is a cap for a writing instrument comprising an inner cap and an outer cap, wherein the inner circumferential hole of the inner cap is provided with a sealing circumferential projection, a front fitting projection, and a rear fitting projection. , Are provided in order toward the opening end side, and a gap is provided between the outer wall of the inner cap and the inner wall of the outer cap at the portion where these protrusions are located, and this gap is not exposed at the opening end of the inner cap. The main point is the cap of the writing instrument that becomes the object.

[0006]

【Example】

 An example will be described with reference to the accompanying drawings. In FIG. 1, the outer cap 1 integrally has a clip 2 and also has a through hole 3. It is obtained by injection molding a synthetic resin such as ABS. Here, the through hole 3 is shown as an example of a design requirement. Further, the inner hole 4 has a circumferential recess 5, a circumferential projection 6, and a groove recess 7 at the opening end. The circumferential recess 5 and the circumferential projection 6 are for fixing the inner cap 8. Although it may be fixed at one place, two places are considered because of a molding constraint that it is difficult to obtain a large undercut portion. Further, the groove-shaped recess 7 improves air communication when the cap is attached to and detached from the main body A.

The inner cap 8 has transparency such as polypropylene, and is obtained by injection molding a relatively soft synthetic resin. The inner cap 8 has a step 10 for abutting against the main body A in the inner hole 9. , A sealing circumferential projection 11, a front fitting projection 12, and a rear fitting projection 13. Further, the outer wall 14 has no gap from the wall surface of the inner hole 4 of the outer cap 1, that is, the inner wall, from the circumferential concave portion 5 to the circumferential projecting portion 6, and dust from the through hole 3 portion. Although it is prevented from invading, a small gap 15 is provided from the circumferential projection 6 to the vicinity of the opening end of the inner cap 4. The sealing circumferential projection 11, the front fitting projection 12 and the rear fitting projection 13 which are sequentially located toward the opening end side are located in the portion where the gap 15 exists. The gap 15 guarantees the deformation escape of the inner cap 8 at these protrusions, and therefore the elastic deformation. However, it is possible to increase the mating force. However, since plastic deformation easily occurs when the cap is repeatedly attached and detached, it is only for the initial period regardless of whether both protrusions are circumferential protrusions or an appropriate number of protrusions. Become.

However, the gap 15 is not exposed at the opening end of the inner cap 4. That is, as shown in an enlarged manner in FIG. 2, the opening end portion of the inner cap 8 is a trumpet-shaped enlarged diameter portion 16 and is in contact with the inner wall of the outer cap 1. When the inner cap 8 is inserted into the outer cap 1, it is abutted slightly elastically. As a result, it is possible to prevent the pen tip from colliding with the open end portion of the inner cap 8, in particular, from being caught in the gap 15. It should be noted that in the illustrated one, the shape of the expanded diameter portion 16 is not such that the wall thickness gradually decreases as the diameter increases, but the elastic contact described above and the pen tip It is an equitable approach to exhibiting elasticity and shape stability in the event of a collision.

Further, the gap 15 may not be exposed at the opening end of the inner cap 4 in addition to the trumpet-shaped expanded portion 16 at the opening end portion of the inner cap 8. For example, the one shown in FIG. 3 is one in which the gap 15 is already covered by the insertion front side of the pen tip by providing the circumferential projection 17 in the inner hole 4 of the outer cap 1. Here, considering that the pen tip may collide with the circumferential protrusion 17, the portion of the circumferential protrusion 17 on the cap opening end side (the lower portion in the drawing) is a long and gentle taper wall.

Although not shown, various other than the above, it is possible. For example, a separate clip may be attached. The inner cap may be fixed to the outer cap indirectly by using a crown as a separate member. Further, in the illustrated example, the pen tip of the main body A, which is visible through the through hole 3 of the outer cap 1, is a flat plate-like nib, specifically, a product (product (Name: Plastic fountain pen) It is designed with the pen tip in mind, but of course it may be appropriate.

[0011]

[Effect of device]

 According to the present invention, there is provided a writing instrument cap comprising an inner cap and an outer cap, wherein the inner hole of the inner cap has a circumferential projection for sealing, a front fitting projection, and a rear fitting projection. , In order toward the opening end side, and at the part where these protrusions are located, a gap is provided between the outer wall of the inner cap and the inner wall of the outer cap. In the inner hole of the inner cap, the sealing circumferential protrusion, the front fitting protrusion, and the rear fitting protrusion must all be provided separately due to design restrictions. Even if it is, the fitting force at the front fitting projection and the rear fitting projection can be reliably exerted for a long period of time, and even if the total length of the inner cap becomes long, the opening end of the inner cap can be extended. It is possible to prevent the pen tip from colliding with and damaging it.

[Brief description of drawings]

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

FIG. 2 is an enlarged view of part I in FIG.

FIG. 3 is an enlarged view corresponding to FIG. 2 showing another embodiment of the present invention.

[Explanation of symbols]

 1 Outer Cap 2 Clip 3 Through Hole 4 Inner Hole 5 Circumferential Recess 6 Circumferential Protrusion 7 Groove Recess 8 Inner Cap 9 Inner Hole 10 Step 11 Sealing Circular Protrusion 12 Front Fitting Protrusion 13 Rear Fitting Protrusion 14 Outer wall 15 Gap 16 Expanded portion 17 Circumferential protrusion

Claims (1)

[Scope of utility model registration request] 1. A cap for a writing instrument comprising an inner cap and an outer cap, wherein an inner hole of the inner cap is provided with a sealing circumferential projection, a front fitting projection, and a rear fitting projection. Provided in order toward the opening end side, and a gap is provided between the outer wall of the inner cap and the inner wall of the outer cap at the portion where these protrusions are located, and this gap is not exposed at the opening end of the inner cap. Writing instrument cap that will become.