JP2512102Y2 - Writing instruments and other caps - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] Caps for fountain pens, small-tube writing instruments, handwriting correction tools, handwriting erasing tools, brushes, eye liners, lip collars, nail collars, etc. Regarding the cap provided.

[0002]

2. Description of the Related Art Ventilation holes that communicate the outside world with the inner holes are provided in the cap for the purpose of preventing suffocation when an infant accidentally swallows the cap.

As one example thereof, the cap is made of an injection-molded resin product having a double structure in which the outer cylinder portion and the inner cylinder portion are connected by a bridge portion, and a ventilation hole is provided in the bridge portion. .

[0004]

Since the ventilation hole is required to allow easy passage of air, it is preferable that the ventilation hole has a large cross-sectional area and a short ventilation distance.

However, when the ventilation distance is shortened, the wall thickness of the bridge portion is thinned, and when the cross-sectional area is increased, the ratio of the wall portion in the bridge portion is reduced. Therefore, it is necessary to make the vent hole through which air can easily pass. The more the strength of the bridge is insufficient,
There is also a high possibility that the cross-linking portion may be deformed or damaged during molding or transportation, and further after reaching the user's hand.

[0004]

SUMMARY OF THE INVENTION The present invention comprises a resin injection-molded product having a double structure in which an outer cylinder portion and an inner cylinder portion are connected by a bridge portion, and has a vent hole for communicating the outside world with the inner hole. In the cap provided in the bridging portion, the gist is a cap for a writing instrument or the like, wherein the bridging portion is provided with a rib that connects the outer tubular portion and the inner tubular portion.

[0005]

EXAMPLE An example will be described with reference to the attached FIGS. The cap A is made of an injection-molded product of synthetic resin such as polyethylene, polypropylene, nylon, polyacetal, polyester, etc., and has an outer cylinder part 1 and an inner cylinder part 2. The bridging portion 3 between the outer tubular portion 1 and the inner tubular portion 2 is located at the open end of the inner tubular portion 2, and the inner hole 4 of the cap A has a small inner diameter portion 5 and a large diameter insertion opening portion 6. And the taper wall surface portion 7 are connected to each other.

An annular inward projection formed on the inner back portion 5 is a sealing portion 8 for the main body B. For example, as shown in FIG. 3, the outer wall of the main body B is press-fitted to seal the front end portion 9 of the main body. . Further, reference numeral 10 is an annular bulging portion 1 of the main body B.
The inward protrusions 1 and 12 which are fitted in a non-sealing manner are protrusions provided to prevent rattling when the cap is attached. Although the main body B in FIG. 3 has a pen tip made of a fiber bundle, it may be properly formed.

Further, the bridging portion 3 has an outer tubular portion 1 and an inner tubular portion 2.
A ventilation hole 14 communicating with the cylindrical space 13 between the outer space 1 and the inner space 2. When viewed in the axial direction, the ventilation hole 14 is located in the middle of the inward projection 10, and the rib 15 is located in the middle of each ventilation hole 14. However, the top of the rib 15 does not reach the inward protrusion 10. The one in the figure is
The inward projection 10, the ventilation hole 14, and the rib 15 are all four, which are arranged at 90 degrees to each other, but the number and shape are appropriate.

The above description has been given by way of example, but various other methods are possible. For example, the rib 15 may be provided on the inner hole 4 side of the bridge portion 3. Further, the bridging portion 3 can be positioned not at the opening end of the inner tubular portion 2 but at an appropriate position of the cylindrical space 13 between the outer tubular portion 1 and the inner tubular portion 2, and, for example, The tops of the outer tubular portion 1 and the inner tubular portion 2 may be connected together.

[0009]

The cap of the writing instrument according to the present invention is made of a resin injection-molded product having a double structure in which the outer cylinder part and the inner cylinder part are connected by a bridge part, and the cap for communicating the outside world with the inner hole is formed. In the cap provided with pores in the bridging portion, since the bridging portion is provided with a rib connecting the outer tubular portion and the inner tubular portion, strength can be imparted to the bridging portion, and the ventilation hole provided in the bridging portion To shorten the ventilation distance of and reduce the thickness of the bridge part,
Even if the cross-sectional area of the ventilation hole is increased to reduce the proportion of the flesh portion in the bridge portion, and thus even if the air hole that allows easy passage of air is provided, the bridge portion is deformed or damaged during molding or transportation. This can be prevented as much as possible.

[Brief description of drawings]

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

FIG. 2 is a front view of FIG. 1;

FIG. 3 is an explanatory view of a usage state of the thing of FIG.

[Explanation of symbols]

 A cap B main body 1 outer cylinder part 2 inner cylinder part 3 bridging part 4 inner hole 5 inner depth part 6 insertion opening part 7 taper wall surface part 8 sealing part 9 main body tip part 10 inward protrusion part 11 annular bulging part 12 Protrusion 13 Cylindrical space 14 Vent hole 15 Rib

Claims (1)

(57) [Scope of utility model registration request] 1. A cap made of a resin injection-molded product having a double structure in which an outer cylinder part and an inner cylinder part are connected to each other by a bridge part, and a ventilation hole communicating the outside world and the inner hole is provided in the bridge part. In the cap, such as a writing instrument, wherein the bridging portion is provided with a rib connecting the outer tubular portion and the inner tubular portion.