JPH0675782U - Writing instrument cap - Google Patents

Abstract

(57) [Summary] [Purpose] With the cap 1 fitted to the writing instrument 7,
In the writing instrument cap that is pushed by the spring 3 in the cap 1 and is fitted to the writing tip portion to make it airtight, the number of parts increases by 1 to obtain a close contact effect with the packing material, and the cost is correspondingly increased. I want to improve the high points. [Structure] The cap 1 has a spindle-shaped protrusion 8 formed in the center of the inside of the top, and a vent hole 9 communicating with the outside air is formed in the top of the cap. The inner cap 2 has a tip portion 11 facing the spindle-shaped protruding portion 8 of the cap 1 and has a thin-walled tapered cylindrical portion facing the tip. With the cap 1 fitted to the writing instrument 7, the tip portion 11 of the inner cap 2 is evenly intimately contacted with the outer surface of the spindle-shaped protruding portion 8 in a state of being slightly expanded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a writing instrument cap in which evaporation of ink is prevented by an inner cap provided in the cap.

[0002]

[Prior art]

 For writing instrument caps that use water-based ink, in addition to the cap, an inner cap that is pressed toward the opening end of the cap by a spring is provided inside the cap, and when the writing instrument is fitted with the cap, the inner cap is The cap is fitted to the tip of the writing to keep the space of the tip of the writing airtight to prevent evaporation of ink. In this case, the air in the space of the writing tip portion, which is trapped when the inner cap is fitted to the writing tip portion, is pressurized by compression, and conversely, when the inner cap is removed from the writing tip portion, the pressure in the space is removed. If the pressure is reduced, the ink may be excessively sucked from the tip of the writing, causing a blur of the writing, or the ink leaking from an air hole provided in the writing instrument.

As an example of a device for surely achieving the airtight state of the space at the tip of the writing by the above-mentioned inner cap, and not applying pressure or decompression, as an example, Japanese Utility Model Laid-Open No. 4-1 20087 discloses , The structure shown in FIG. 4 is disclosed. This is done by forming a vent hole 4 in the front end portion of the inner cap 2 that is pressed by the spring 3 toward the cap opening end, attaching an annular elastic packing 5 to the front portion of the vent hole 4, and A communication hole 6 communicating with the outside air is formed on the side surface of the top. With such a configuration, as shown in FIG. 5 from the state of FIG. 4, the inner cap 2 is pushed inward against the panel 3 by the writing instrument 7 inserted in the cap 1, and the cap 1 is locked to the writing instrument 7. In the state shown in FIG. 5, the annular elastic packing 5 is pressed against the inner wall surface of the flat top portion of the cap body 1 to form a space that contacts the inside of the inner cap 2 and a space that communicates with the communication hole 6 that contacts the outside of the inner cap 2. Surely shut off. Further, when the air in the inner cap 2 is contained, the communication hole 6 communicating with the outside air prevents the increase in the inner pressure of the inner cap 2 from being observed.

Although not shown in the drawing, a communication hole communicating with the outside air is formed at the center of the top of the cap, and an annular elastic seal body is provided on the top surface of the inner cap. It is also known that the elastic seal body surrounds the communication hole and is pressed against the inner top surface of the cap to block the ventilation with the outside air (see Japanese Patent Publication No. 4-77676).

[0005]

[Problems to be solved by the device]

 If the member that presses the flat surface of the cap is a packing material that is highly elastic, a more reliable adhesion effect can be obtained as compared with the case of pressing with a relatively hard flat end surface. However, the cost will increase as the number of parts increases by one.

Therefore, an object of the present invention is to provide a cap for a writing instrument which can surely achieve the same effect without increasing the number of parts.

[0007]

[Means for Solving the Problems]

 The present invention has a cap and an inner cap that is pushed toward the opening end of the cap by a spring mounted in the cap. When the cap is fitted to a writing instrument, the inner cap is fitted to the writing tip portion. In a cap for a writing instrument that is worn to keep the space at the tip of the writing airtight, the cap has a spindle-shaped protrusion in the center of the inside of the top, and a vent hole communicating with the outside air is formed in the top surface of the cap. , The inner cap is a thin-walled taper-shaped cylinder with the tip facing the spindle-shaped protrusion of the cap facing the tip, and the tip of the inner cap is the spindle-shaped protrusion when the cap is attached to a writing instrument. The outer surface of the is slightly spread and evenly adhered.

[0008]

[Work]

 When the writing instrument is inserted from the open end of the cap and the inner cap is pushed forward against the spring, the thin-walled, tapered tubular tip of the inner cap is covered from the outside of the spindle-shaped protrusion of the cap, and the cap engages the writing instrument. Immediately before stopping, the inner surface of the tip of the inner cap comes into contact with the outer surface of the spindle-shaped protrusion. The inner cap corrects its posture as shown in. In this way, when the cap is locked to the writing instrument, the tip of the inner cap is evenly spread in a state of being slightly expanded by the outer surface of the spindle-shaped protrusion. When the internal pressure rises while the air in the inner cap is confined, it immediately escapes from the ventilation groove formed on the top of the cap, so no increase in internal pressure is seen. For the same reason, the internal pressure is not reduced when the cap is removed.

Further, in the case of the cap alone, the vent hole formed on the top surface of the cap reaches the end opening of the cap through the tip opening of the inner cap, and a sufficiently large air flow passage can be secured, so that the infant accidentally swallows it. Even so, suffocation can be avoided.

[0010]

【Example】

 In FIG. 1, the feature of the cap 1 is that a spindle-shaped protrusion 8 is formed in the center of the inside of the top, and ventilation holes 9 and 9 (see FIG. 2) communicating with the outside air are formed on the top surface of the cap 1. That is the point. The ventilation holes 9 and 9 shown in the figure have an arc shape and are provided so as to face the periphery of the base of the spindle-shaped protrusion 8, but the position, number and shape are not limited to this, and a circular hole One may be opened in the outer peripheral portion. An annular convex portion 10 formed substantially in the center of the body 1 of the cap 1 serves as both an inner cap 2 and a writing instrument 7, as will be described later.

A feature of the inner cap 2 is that a tip end portion 11 of the cap 1 facing the spindle-shaped protrusion 8 is a thin-walled tapered cylindrical portion facing the tip. In the example of the inner cap 2 shown in the figure, three of a small-diameter tubular portion, a medium-diameter tubular portion, and a large-diameter tubular portion are connected in series, and the small-diameter tubular portion that is the tip portion 11 is a thin-walled tapered tube as described above. The shoulder portion 12 of the medium-diameter cylindrical portion serves as a spring for the spring 3 disposed between the inner peripheral portion of the top of the cap 1. The small-diameter cylindrical portion and the medium-diameter cylindrical portion may be connected in a curved shape in one direction. When the inner cap 2 is elastically pressed toward the cap opening by the force of the spring 3, the outer end of the opening of the large-diameter cylindrical portion is locked to the annular convex portion 10 of the cap 1, so that the inner cap 2 is kept inside the cap 1. There is nothing like jumping out of.

By inserting the writing body 7 into the cap 1 and pushing the end surface 14 of the inner cap 2 with the pressing surface 15 of the writing body 7, the inner cap 2 can be pushed inward against the force of the spring 3. As a result, when the bulging portion 16 of the writing body 7 gets over the annular convex portion 10 of the cap 1, the cap 1 shown in FIG. 3 is fitted to the writing body 7. In this state, as described above, the tip portion 11 of the inner cap 2 is slightly spread by the outer surface of the spindle-shaped protrusion 8 of the cap 1 and is evenly adhered thereto.

The modification shown in FIG. 4 is an example in which the crown 13 is fitted to the cap of FIG. When the configuration in which the crown 13 is fitted as in this example is adopted, the ventilation hole 9 is also provided in the crown 13. This is because the rise of the internal pressure is released during the process of trapping the air by the fitting of the inner cap 2, and also in order to secure the air flow passage that avoids suffocation when the infant swallows the cap. It is also necessary from.

[0014]

[Effect of device]

 According to this invention, the spindle-shaped protruding portion of the cap and the tip portion of the inner cap forming the thin-walled tapered cylindrical portion allow the fitting to be performed even if it is a one-sided contact at the initial stage of the fitting. As the process progresses, the posture of the inner cap will be automatically adjusted so that it will be evenly touched on the entire circumference, and it will be possible to ensure a uniform contact state at the stage of completion of fitting. In addition, since the thin-walled tapered cylinder at the tip of the inner cap is easily elastically deformed, when the inner cap is attached to the writing tip, the spindle-shaped protrusion deforms to a slightly expanded state. By doing so, the space at the tip of the writing can be reliably made airtight, and ink evaporation can be prevented. It is also possible to return to the original state immediately after separating from the outer surface of the spindle-shaped protrusion, and since the deformation is slight, the sealing function does not deteriorate even if it is used repeatedly. In this way, elastic packing is not used and the number of parts is not increased.

Further, the ventilation hole formed on the top surface of the cap has a function as a relief that does not increase the internal pressure in the process of trapping the air by the inner cap, and also through the tip opening of the inner cap from the ventilation hole. By providing a relatively large passage to the end opening of the cap, it is possible to avoid suffocation if an infant accidentally swallows the cap.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a writing instrument cap according to the present invention.

FIG. 2 is a plan view seen from the left side of FIG.

FIG. 3 is a cross-sectional view when the cap of FIG. 1 is attached to a writing instrument.

FIG. 4 is a cross-sectional view showing a modified example of the cap of FIG.

FIG. 5 is a cross-sectional view showing an example of a conventional writing instrument cap.

6 is a cross-sectional view when the cap of FIG. 4 is attached to a writing instrument.

[Explanation of symbols]

 1 Cap 2 Inner Cap 3 Spring 8 Spindle Type Projection 9 Ventilation Groove 11 Tip Location

Claims (1)

[Scope of utility model registration request] 1. A cap 1 and an inner cap 2 which is pushed toward the cap opening end by a spring 3 mounted in the cap 1, and the cap 1 is used as a writing instrument 7.
In the writing tool cap in which the inner cap 2 is fitted to the writing tip portion to make the space of the writing tip portion airtight in the state of being fitted to the above, the cap 1 has a spindle-shaped protrusion 8 at the center of the inside of the top. Along with the vent hole 9 that communicates with the outside air
Is formed on the top surface of the cap 1, and the inner cap 2 is formed as a thin-walled tapered cylindrical portion with a tip portion 11 facing the spindle-shaped protrusion 8 of the cap 1 toward the tip. The writing tool cap, wherein the tip portion 11 of the inner cap 2 is evenly spread by the outer surface of the spindle-shaped protrusion 8 in a state in which the writing head is fitted tightly.