JP2528460Y2 - Brush shaft cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a safety cap having a configuration for preventing suffocation due to accidental swallowing.

(Prior Art) Conventionally, as the above-mentioned safety cap, a rib is provided on the outer periphery of the cap body, or a ventilation space is provided on the outer periphery by using a clip, and a ventilation path is provided in the inner wall of the cap in the axial direction. In some cases, even if the cap is accidentally swallowed, an air passage is secured to prevent suffocation.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional one, a rib is formed on the outer peripheral wall, or an inner cylinder that covers the brush tip portion is formed in the outer cylinder to form a ventilation path between the inner and outer cylinders. It is complicated and expensive to perform the molding integrally,
Furthermore, in the case where the brush tip is covered with the inner cylinder, the inner cylinder is provided in the outer cylinder, so the inner diameter opening is smaller, and the brush tip is used for the one with a larger diameter, and cannot be airtight. When the cap is pulled out from the upper brush tip, the cap is air-tight, so that the air in the inner cylinder may be decompressed and the ink contained in the brush shaft may leak.

This invention is intended to improve the above-mentioned drawbacks of the prior art, and is intended to be easy to mold and to secure the necessary axial permeability together with its strength.

(Means for Solving the Problems) To this end, a plurality of outer grooves are arranged in the axial direction on the upper outer periphery of a cylindrical body having a lower end opening, and inner grooves communicating with these outer grooves are formed on the lower inner wall at the opening. The inner wall between the inner groove and the closed edge is formed as an airtight curved surface.

(Operation) Since the present invention has the above configuration, the axial outer groove provided on the outer side of the cylindrical body and the axial inner groove provided on the inner wall communicate with each other. Since a sufficient air passage is secured in the axial direction, the necessary cross-sectional area is determined by the cross-sectional area of one groove and the number of grooves provided in parallel. In addition, the tip of the brush can be air-tightened by the upper part of the large-diameter cap, so that the brush can also be used with a large-diameter tip. Therefore, it is possible to easily form and reduce the cost because the punching die can be used as the punching die.

(Example) This invention is demonstrated by the Example shown in a figure. (1) is a cylindrical body having an opening (4) at one end to constitute a writing instrument cap, and (2) is a plurality of cylinders arranged in the axial direction from the other end closed by the top surface (6) to the outer periphery. Are provided to the position at which the tip of the brush shaft in the center of the cap cylinder (1) is air-tight, and these outer grooves (2) are provided at the ends.
The cap cylinder (1) communicates with the axial inner groove (3) extending from substantially the center to the opening (4). (7) is a hole at the connecting portion of the outer groove (2) and the inner groove (3), and these holes communicate with each other. (5) is a curved surface formed on the inner groove (3) leading to the opening (4) and the inner wall leading to the closed edge, and the curved surface (5) is inserted into the cap from the opening (4) into the pen shaft ( When not shown) is inserted, the tip of the pen shaft and the outer periphery of the pen shaft are closely air-tightened.

Since the embodiment has the above-described configuration, when this cap is inserted into the brush shaft, even if the tip of the brush shaft has a large diameter, it can be air-tight.

If the cap is accidentally swallowed, the outer groove (2) in the upper half communicates with the inside of the cap cylinder (1) through the hole (7), so that a sufficient ventilation path can be secured in the axial direction. ,
There is no risk of choking due to swallowing.

The inner groove (3) provided on the inner wall of the cap cylinder (1)
Since the hole (7) can be provided while leaving the wall thickness between the inner grooves (3), the cap strength can be sufficiently maintained.
Since the inner groove (3) is provided up to the opening (4), it can be formed by a punching die.

(Effects of the Invention) As described above, this invention is provided with a configuration as a safety cap, with sufficient air tightness of the pen shaft, a groove provided on an inner wall surface following the communication hole, and a curved surface between the grooves to form the cap. While maintaining the thickness, the strength can be improved, and it has excellent effects such as easy molding.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG.
FIGS. 3 and 4 are sectional views, and FIGS. 5 and 6 are sectional views taken along lines AA 'and BB' of FIG. 4, FIG.
FIG. 8 is a sectional view taken along line CC 'and DD' of FIG. DESCRIPTION OF SYMBOLS 1 ... Cap cylinder, 2 ... Outer groove, 3 ... Inner groove, 4 ... Opening, 5
… Curved surface, 7… hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of outer grooves are juxtaposed axially from a closed edge on an outer periphery of a cap cylinder having one end opened, and an inner groove communicating with the outer groove is formed at an axially open end on the inner wall of the cylinder. Up to,
In addition, a cap for a brush shaft that has an airtight curved surface between the inner groove and the inner wall extending to the closed edge.