JPS6119036Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an improved ink drying prevention device for the writing part of a writing instrument.The purpose of this invention is to attach the cap airtightly to the neck part where the writing part is attached. The purpose of the present invention is to provide a cap in which the writing part 3 of the neck part 2 can also be inserted airtight through a recessed hole in an elastic cylinder to prevent the ink on the writing part from drying out.

Hereinafter, referring to the drawings, reference numeral 1 denotes a shaft cylinder in which ink is stored either directly or by being stored in an ink storage material. 2 is the tip, commonly known as the neck,
3 is a writing part such as a ball or fiber. The neck portion 2 is formed with a tapered surface 4 having a smaller diameter in the direction of the tip 2a, that is, the writing portion 3, in the large diameter portion 5 in accordance with the diameter of the shaft cylinder 1, and an annular groove 6 is formed in the large diameter portion 5. It is formed into a steeply sloped surface 7 that slopes downward in the direction of the cylinder 1.

Next, 8 is a cap, and an inner tube 11 is placed inside the tube tube 9.
The outer periphery of the mating cylinder part 10a of the stopper lid 10 is firmly inserted into the inner peripheral surface of the tube tube 9 at the upper end, and the inner peripheral surface 10b is firmly inserted between the outer peripheral surface of the small diameter tube at the upper end of the inner tube 11 to form an inner tube. 11
is fixed in the tube tube 9, and this inner tube 11 has a center hole 11.
A is formed into a thin-walled cylinder 12 with elasticity by sequentially forming a lower part of approximately the middle to a large diameter 11b and the outer circumferential surface to a small diameter. An annular protruding edge 11c is formed, and this annular protruding edge 11c is inserted into the steeply downwardly inclined surface 7 of the neck portion 2 using the elasticity of the thin-walled tube 12 to maintain airtightness and cut off communication with the outside air. let Also, neck 2
The writing part 3 is inserted into a concave hole 13c opened from the lower end of the elastic tube 13 installed in the center hole 11a of the inner tube 11, leaving the upper end. Insert the tip 2a and make it roughly trumpet-shaped 1
3b, the ink in the writing section 3 is prevented from drying by blocking air communication between the inside of the recessed hole 13c and the outside air with its elasticity. Note that 14 in the drawings indicates a clip.

Since this invention is constructed as described above, by inserting the cap 8 into the neck 2 of the shaft cylinder 1, the inner cylinder 11
The elasticity of the thin inner cylinder 12 and the annular protruding edge 11c of the thin wall cylinder 12 are inserted into the steeply downwardly inclined surface 7 of the neck part 2 and come into close contact with each other. In addition, the cap 8 can be pulled in the direction of the shaft cylinder 1 to prevent the engagement between the two from loosening naturally due to external impact, etc., and the writing part 3 of the neck part 2 can be
can be easily inserted into the concave hole 13c of the elastic tube 13, while the opening of the elastic tube 13 is expanded into a trumpet-like shape 13b at the tip 2a of the neck portion 2, and the two are tightly adhered, so that the concave hole 13c can be inserted at this point as well. It can prevent the ink in the writing section 3 from drying by blocking communication between the inside and the outside air, and has the effect of not only ensuring the sealing of the writing section 3 but also allowing for durable use.

[Brief explanation of the drawing]

The drawing shows a longitudinal sectional view of the main parts. 1... shaft tube, 2... neck,... writing part, 4...
Tapered surface, 5... Large diameter portion of neck, 7... Downward steep slope, 8... Cap, 9... Tube tube, 10...
Bottle lid, 11... Inner tube, 12... Thin wall tube, 13...
Elastic tube.

Claims (1)

[Scope of utility model registration request] A tapered annular groove 6 is formed between the shaft cylinder 1 and the neck part 2, and an annular steeply sloped surface 7 that becomes narrower in the direction of the shaft cylinder 1 is formed, and an inner cylinder 11 and an elastic cylinder 13 are formed inside.
The center hole 1 of the inner cylinder 11 of the cap 8 to which the
1a gradually becomes larger in diameter as it goes downward from approximately the middle,
Further, the outer circumferential surface is formed to have a small diameter to form an elastic thin-walled tube 12, and an annular protruding edge 11c is formed on the inner circumferential surface of the lower end of this thin-walled tube 12, and this annular protruding edge 11c is formed on the steeply inclined surface of the neck portion 2. 7, and the writing part 3 of the neck part 2 is inserted into the concave hole 13c of the elastic cylinder 13 attached by passing through the center hole 11a of the inner cylinder 11. An ink drying prevention device for a writing section of a writing instrument, which is configured so that an upper edge 2a of a neck portion is brought into pressure contact with the upper edge 2a of the neck portion.