JPH088864Y2 - Ink tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) An ink tank in which at least a mounting portion and a plug body are integrally formed by injection molding, and a pressurizing body is inserted into the mounting portion. The present invention relates to a device that can be opened by pressurizing. Here, examples of the ink include a writing liquid, a cosmetic liquid, and a correction liquid.

(Conventional technology and its problems) Conventionally, there are roughly two types of ink tanks. The first one has the plug body as a separate body such as a ball and a disc-shaped body, and the second one has the plug body integrally. In the second aspect of the present invention, the stopper is usually
It is formed by injection molding a synthetic resin,
It is more advantageous than the first one in terms of cost and the like.

However, on the other hand, it is difficult to open the stopper. That is, when opening the stopper, some pressure body, for example, a pen core rear end portion, or a piercing portion of a joint member between the front shaft and the rear shaft is inserted into a mounting portion which is a front portion of the stopper body of the ink tank, Although the stopper is pressed and opened, a large force is required because the molded product is broken.

Here, in order to reduce the opening force as much as possible, it is general to make the wall thickness of the peripheral part of the plug body, that is, the part near the inner wall of the mounting part as small as possible. There is a limit even if it is thin, and by making the back end shape of the pressurizing body sharp, such as a bamboo spear shape, not only shearing force but also cutting force will not work when opening. However, it is practically difficult to give the sharpness of a blade, and in addition, the cutting force becomes more and more blunt during repeated opening.

Therefore, an object of the present invention is to provide an ink tank that can be opened very easily.

(Means for Solving the Problem) The plug body is provided with a tapered wall capable of sandwiching the rear end portion of the pressurizing body in the vicinity of the inner wall of the mounting portion. That is, the present invention is
An ink tank in which at least a mounting portion and a plug body are integrally molded by injection molding, wherein a pressurizing body is inserted into the mounting portion and the plug body can be opened to open the cap. The gist of the plug body is an ink tank having a tapered wall capable of sandwiching the rear end portion of the pressure body with the inner wall of the mounting portion.

(Example) Hereinafter, the present invention will be described in detail based on an example.

A first embodiment of the present invention is shown in FIGS. Reference numeral 1 is an ink tank main body, and has an accommodating portion 2 for accommodating ink, a plug body 3 for sealing the accommodating portion 2, and a mounting portion 4 which is a front portion of the plug body 3. The overall shape is cylindrical, and the rear end portion (not shown) is appropriately sealed by attaching a tail plug or the like. Material is polyethylene,
It is an appropriate synthetic resin such as polypropylene. Here, the plug body 3 is a side wall surface (hereinafter referred to as a rear surface) 3a of the flat housing portion 2a.
And a truncated cone-shaped mounting portion 4 side wall surface (hereinafter referred to as front surface) 3b
And have. However, the peripheral portion 3c which is a portion near the inner wall 4a of the mounting portion 4 has a constant thickness portion, and the tapered wall 3d which is the conical generatrix portion forms an angle α with the inner wall 4a of the mounting portion 4. Then, it becomes a connection portion with the peripheral portion 3c (see FIG. 2).

The state when opening this example is the third
Shown in FIG. Reference numeral 5 is a pressurizing body, and the rear end 5a of the pressurizing body 5 projects in a semicircular shape. In FIG. 3, the rear end 5a is in contact with the inner wall 4a of the mounting portion 4, and It shows a state in which it has entered No. 4 and is in contact with the tapered wall 3d. Fourth
The figure shows a state in which the pressurizing body 5 has further advanced. That is,
The state in which the angle α formed between the tapered wall 3d and the inner wall 4a of the mounting portion 4 is increased by the rear end 5a of the pressing body 5 is shown. At this time, the fact that the angle α becomes large means that the tearing force is applied to the peripheral edge portion 3c, and therefore, if the pressurizing body 5 is further entered, the stopper is finally opened from the peripheral edge portion 3c. Will be done.

Next, FIG. 5 shows a second embodiment. In addition, the same reference numerals are used for basically the same parts as those in the previous example.

The present example is different from the previous example in the following two points. First, in the previous example, the rear surface, which is flat in the previous example, has a complicated shape. That is, this is an example showing that an appropriate portion may have an appropriate shape. Secondly, the inner wall 4a of the mounting portion 4 is distorted in the vicinity of the plug body 3 so that the inner diameter of the mounting portion 4 as a hole is reduced. By doing so, the rear end 5a of the pressurizing body 5 enters the inner wall 4a of the mounting portion 4 and the taper wall 3d of the front wall 3b at the same time or with a slight time difference when the rear end 5a of the pressurizing body 5 enters the vicinity of the stopper 3. It will come into contact and abut. Therefore, the force for increasing the angle α is also applied to the inner wall 4a side of the mounting portion 4, so that the deforming force need not be applied only to the plug body 3. Further, since the inner diameter of the mounting portion 4 as the hole is reduced, the pressing body 5
The pressure input with and is also high, thus contributing to the prevention of falling.

In addition to the above, various things can be done. For example, the tapered wall may have an appropriate cross section, and the illustrated one is drawn in a straight line, but it may be one that can be drawn in a gentle curved line, and may have a radial rib or the like.
The peripheral portion 3c may be omitted, and further, as shown in FIG.
The portion of the mounting portion 4 and the plug 3 may be a separate injection-molded product, and thus may be a properly-molded product or a combination of materials. The shape of the pressurizing body 5 is also appropriate, and the rear end 5a may be chamfered. In some cases, the ink tank of the present invention may be used in combination with a bamboo spear-like pressurizing body. You can also

(Effect of the Invention) An ink tank that can be opened very easily by utilizing the tearing force may be used.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part showing a first embodiment of the present invention, FIG. 2 is an enlarged view of part A of FIG. 1, and FIGS. 3 and 4 show the opening of the plug according to the first embodiment. FIG. 3 is a cross-sectional view of an essential part for explaining the state, FIG. 3 shows a state in which the pressure body contacts the tapered wall, and FIG. 4 shows a state in which the pressure body deforms the plug body. Further, FIG. 5 is a cross-sectional view of the essential parts showing the second embodiment, and FIG. 6 is a cross-sectional view of the essential parts showing a modified example. 1 ... Ink tank, 2 ... Storage part, 3 ... Stopper, 3a ... Rear wall,
3b ... front wall, 3c ... peripheral part, 3d ... tapered wall, 4 ... mounting part,
4a ... inner wall, 5 ... pressurizing body, 5a ... rear end.

Claims (1)

[Scope of utility model registration request] 1. An ink tank in which at least a mounting portion and a plug body are integrally formed by injection molding, and a pressurizing body is inserted into the mounting portion, and the plug body can be opened by pressing. In the ink tank according to the present invention, the stopper has a taper wall capable of sandwiching the rear end portion of the pressure body with the inner wall of the mounting portion.