CA2004963A1 - Cap of writing materials - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE
A cap for a writing instrument having an inner cap within the inner hole of the main cap and air holes bored through the bottom plate of the main cap between the main cap and the inner cap.

Description

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Cap of Writing Instruments BACKGROUND OF THE INVENTION
Field of the invention The present invention relates to an improvement of the cap of a writing instrument such as a fiber-tipped pen, marker, and aqueous ball pen, which is fit on the tip of the writing instruments in order to prevent ink from evaporating and to protect the painting materials such as a pen point.
Prior art Conventional caps of wiritng instruments includi.ng fiber-tipped pens and markers are made of resin molding products having a sufficient characteristic to suppress the evaporation of ink. As shown in Fig. S to Fig. 8, the inner cap section 13 extends in the internal hole 15 of the cap 12 from and integrally with the rear plate of the cap 12 and the internal hole 15 has no opening to the outside except the insertion side to make the inside of the cap sealed if the opening is closed.
Such a conventional cap can perform su~ficient features for the writing instrument itself to yield no functional problems. However, since the cap is removable from the main body and has an internal hole sealed except the insertion sides, it would cause such an accident that a little child swallows the cap by mistake to be strangled cap lodged in his windpipe. Thus it has long been desired that the cap have such a mechanism in which the inside of the cap is communicated with the outside even through othex than the opening, while reserving the functions of the prevention of the evaporation of ink and the protection of the painting material.
The present invention is intended ~o provide a cap improved so that the inside of the cap i5 communicated with the outside even through other than the opening of the cap to enable a little child not to be strangled if he swallows the cap to be lodged in his windpipe by mistake.
SUMMARY OF THE INVENTION
The present invention provides an improved cap fit on .
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1fi~3 the tip of a writin~ instrument such as a Ei~er-tipped pen and a marker in order to prevent ink from evaporating and protect the palnting materials and characterized in that a cylindrical inner cap thinner than the main cap is provided protruding on the bottom plate and one or more air holes is bored through the bottom plate between the main cap and the inner cap.
BRIEF DESCRIPTION OF THF, DRAWINGS
Fig. 1 is a sectional view of the cap for a marking pen produced according to the invention, Fig. 2 is a perspective diagram of the cap shown in Fig.
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Fig. 3 is a sectional perspective diagram of the cap shwon in Fig. 1, Fig. 4 is the bottom view of the cap shown in Fig. 1, Fig. 5 is a view similar to Fig. 1 illustrating the cap of the conventional marking pen, Fig. 6 is a perspective diagram of the cap shown in Fig.
5, Fig. 7 is a sectional perspective diagram of the cap shown in Fig. 5, and Fig. 8 is the bottom view of the cap shown in Fig. 5.
DETAILED DESCRIPTION AND THE PREFERRED EMBODIMENT OF THE
INVENTION
The in~ention will be described with the preferred embodiment shown in Fig. l and Fig. 4 applied to the cap of a marking pen.
Referring to Fig. 1 to Fig. 4, the reference numeral 1 is a body of the marking pen and 5 is the cap of the pen.
As shown in Fig. 1, the cap 5 is fit on the -tip of the marking pen 1 to cover the pen point 3 of the marking pen.
As illustrated in Figs. l and 3 mo~e clearly, the cap 5 mainly consists of a main cap 16 and an inner cap 6.
The main cap 16, which is shaped cylindrically, has an opening at the fron-t end and is closed with a bottom plate 9 at the rear end.
In the internal hole of the main cap 16, a cylindrical ', 1' "' ' '~' ' ' '.': ''`'`" ':-',, , . . ..

inner cap 6 thinner and shorter than the main cap 16 is provided on the bottom plate 9 in the coaxial manner to the maln cap.
The inner cap 6 also has an opening only at the Eront end. The internal wall near the front end of the inner cap 6 is provided with a projecting line 10 in the circular direction joined hermatically with a groove 4 in the circular direction provided on the neck of the main marking pen to be inserted into the inner cap to hold the cap.
Four round air holes are bored through the bottom plate 9 of the main cap 16 between the inner wall of the main cap and the outer wall of the inner cap. The number and shape of the air holes may vary.
When the cap is fit on the main marking pen as shown in Fig. 1, the inside of the inner cap is sealed tightly to prevent ink from evaporating and protect the pin point. With the cap removed from the body of the marking pen, the air flows within the cap in the axial direction through the air hoLes. Thus if a little child swallowed the cap, he would not be strangled by the cap lodged in his windpipe.
The inner cap can be configured to be separated from the main cap. ~ ~

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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A cap for a writing instrument such as a fiber-tipped pen and a marker, which is fit on the tip of the writing instrument in order to prevent ink from evaporating and to protect the painting materials, characterized in that a cylindrical inner cap thinner than the main cap is provided on the bottom plate of the main cap and one or more air holes are bored through the bottom plate between the main cap and the inner cap.