JPH09123664A - Liquid sucking tube and writing implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the shape of a tube changeable by a twist in an overall length thereof and thereby to improve the efficiency of suction of liquid by a method wherein thin-wall bending parts formed of groove-shaped recessions bending on the occasion of twisting are provided in the length direction of the tube which sucks in the liquid by the twist and cancellation thereof. SOLUTION: A liquid sucking tube 1 for a writing implement is open in the front part and a finger-operated part 3 is formed in the peripheral surface of the bag-shaped rear part thereof. In the part of the tube between a flange part 2 and the finger-operated part 3, bending parts 4, 5, 6a and 6b are provided along the direction of the axis. The bending parts 4 and 5 are formed of V-shaped grooves 4a and 5a in the tube 1, while the bending parts 6a and 6b are formed in the outer surface of the tube on the side of an angle θ of opening of lines connecting the centers of the grooves 4a and 5a and the central point O of the section of the tube respectively. On the occasion of sucking ink, internal air is forced out of the tube 1 by twisting the finger-operated part 3, the twist is then canceled, the original shape of the tube 1 is restored by resilience and thereby the ink is sucked.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a liquid suction tube and a writing instrument.

[0002]

2. Description of the Related Art Taking an ink suction tube for a writing instrument as an example of a liquid suction tube, there is a cylindrical rubber tube 22 as shown in FIG. This tube is connected to the writing part of a writing instrument.When inhaling ink, twist the back of the tube with your finger to push out the air inside the tube, then release your finger, and restore the tube to its original shape by the self-repulsive force to inhale the ink. I can do it.

[0003]

However, in such a conventional cylindrical tube, as can be seen from the results of experiments described later, the liquid is sucked in only half or less of the inner volume of the tube in one twist. However, there was a drawback that the inhalation efficiency was poor.

The reason for this is that the tube does not deform over its entire length even if it is twisted. Therefore, reference numeral 23 in FIG.
The internal cross-sectional area of the tube does not become small in the area indicated by
Not able to push out all of the air in the tube. Inhalation efficiency is hindered by such a cause.

The present invention has been made under the above circumstances, and an object thereof is to provide a liquid suction tube having a high liquid suction efficiency by twisting and deforming the entire length of the tube to reduce the internal cross-sectional area in the tube as much as possible. And

Another object of the present invention is to provide a writing instrument having a simple structure.

[0007]

Means for Solving the Problem That is, the present invention provides "1. A tube for sucking a liquid by twisting and releasing the tube, wherein a thin bent portion that bends when twisted is provided in the length direction of the tube. , A liquid suction tube formed by a groove-shaped recess provided on the tube surface of this bent portion 2. A liquid suction tube according to item 1, wherein the liquid suction tube is an ink suction tube for a writing instrument 3. A liquid suction tube is a dropper Is the first tube
The liquid suction tube according to the item. 4. The writing part, the shaft part connected to the writing part, the front part and the rear part each have an opening and a finger operation part, and the opening is connected to the writing part and stored in the shaft part. The finger operation part is twisted and released. An ink suction tube for sucking ink by means of an ink suction tube formed by a groove-shaped recess provided on the tube surface, the bending section having a thin wall that bends when twisted in the length direction of the tube, Writing instrument equipped with. ".

Since the liquid suction tube of the present invention has the thin bending portion, when the tube is twisted and deformed, the tube is deformed over the entire length with the bending portion as a guide, and the liquid suction efficiency can be improved. Becomes

The writing instrument of the present invention can be composed of a writing section, a shaft section, and an ink suction tube, and can have a simple structure.

In the present invention, the bent portion is provided in the length direction of the tube, and it is preferable that the length extends at least over the entire length of the liquid storage portion of the tube, and in addition to the straight shape along the axial direction of the tube, the spiral portion. The bent portion is also included. Further, in the present invention, one or two or more bent portions can be provided. When two bent portions are provided, it is preferable to set the opening angle θ of each line connecting the center of each bent portion and the center point of the tube cross section to 120 ° ≦ θ ≦ 180 °.

The groove-shaped recess forming the bent portion includes a normal groove, a V-shaped groove, a U-shaped groove, and a slit, and these can be used alone or in combination. The groove-shaped recess can be provided on the outer surface or the inner surface of the tube. The tube used in the present invention may have a multilayer structure.

In the present invention, (a) a groove-shaped recess is formed by a slit, and two grooves are provided on the outer surface of the tube.
The bent part formed by this groove-shaped recess is formed symmetrically with respect to one center line of the tube cross section, and the opening angle θ of each line connecting the center of the bent part and the center point of the tube cross section is set to θ = 180 °. What you did, and

(B) The groove-shaped recess is formed by a V-shaped groove or a U-shaped groove, and two grooves are provided on the inner surface of the tube, and the bent portion formed by the groove-shaped recess is one center line of the tube cross section. Is symmetrically formed, and the opening angle θ of each line connecting the center of the bent portion and the center of the tube cross section is set to θ = 180 °, which is excellent in inhalation efficiency.

Further, (c) the groove-shaped recess is formed by a V-shaped groove or a U-shaped groove, and 2 is formed on the outer surface of the tube.
The bending portion formed by the groove-shaped recess is formed symmetrically with respect to one center line of the tube cross section, and the opening angle θ of each line connecting the center of the bending portion and the center point of the tube cross section is θ = 180. Set to ゜, and

(D) The groove-shaped recess is formed by a V-shaped groove or a U-shaped groove, and two grooves are first provided on the outer surface of the tube, and the bent portion formed by the groove-shaped recess is formed at the center of one section of the tube. The lines are formed symmetrically, and the opening angle θ of each line connecting the center of the bent portion and the center point of the tube cross section is set to θ = 180 °, and further the V-shaped groove or U is formed on the outer surface of the tube on this center line. A bent portion formed by a groove-shaped recess formed by a V-shaped groove, and

(E) The groove-shaped recess is formed by a slit, and two grooves are first provided on the outer surface of the tube. The bent portion formed by the groove-shaped recess is formed symmetrically with respect to one center line of the tube cross section. The opening angle θ of each line connecting the center of the tube and the center point of the tube cross section is 120 ° ≦ θ
≤180 °, and (e-1) whether to form one or more bent portions formed by groove-shaped recesses formed by V-shaped grooves or U-shaped grooves on the outer surface of the tube on the opening angle θ side , (E-2) 2 formed by a groove-shaped recess formed by a V-shaped groove or a U-shaped groove on the outer surface of the tube on the side of the opening angle θ
One or more bent portions are formed, and two or more bent portions are connected by a thin portion, and

(F) The groove-shaped recess is formed by a V-shaped groove or a U-shaped groove, and two grooves are first provided on the inner surface of the tube, and the bent portion formed by the groove-shaped recess is one center line of the tube cross section. And the opening angle θ of each line connecting the center of the bent portion and the center point of the tube cross section is set to 120 ° ≦ θ ≦ 180 °, and (f−
1) V-shaped groove or U on the outer surface of the tube on the opening angle θ side
One or two or more bent portions formed by the groove-shaped recess formed by the V-shaped groove are formed, or (f-2) the groove-shaped recess formed by the V-shaped groove or the U-shaped groove on the tube outer surface on the side of the opening angle θ. By forming two or more bent portions formed by and connecting the two or more bent portions with a thin portion, the suction efficiency is excellent, and the tube bulge during twisting can be reduced. it can.

The liquid suction tube of the present invention can be used not only as an ink suction tube for writing instruments but also as a dropper tube. In the case of using a dropper, a funnel-shaped suction tool is attached to the tube opening end or the tube opening end is made thin.

The writing instrument can be formed by accommodating (g) a tube in a shaft portion connected to the writing portion. Alternatively, (h) the shaft portion may be divided into a front shaft portion and a rear shaft portion, and the rear shaft portion may cover and form the finger operation portion at the rear portion of the tube.
In the writing instrument of (h), only the rear shaft part can be removed to perform the suction operation, and at the time of ink suction, the front shaft part can protect the tube from unexpected external pressure, and the suction operability is also good, but the front shaft Since the tube is twisted with the tube inserted in the portion, it is preferable to use a tube having a small bulge when twisting so that the tube does not come into contact with the front shaft portion.

Preferred materials for forming the tube are ethylene propylene rubber (EPDM), silicone rubber (Si), butyl rubber (IIR), chloroprene rubber (CR), nitrile rubber (NBR), hypalon (CS).
M). The hardness of the tube is Hs = 30-80
(JIS A) is preferable.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described.

FIG. 1 is a front view of a liquid suction tube for a writing instrument, and FIG. 2 is an enlarged sectional view taken along the line AA of the tube. The tube 1 is formed in a bag shape with its front portion opened and its rear portion closed. The front portion of the tube 1 is provided with a flange portion 2, and the rear portion of the tube 1 has a flat knurl formed on its peripheral surface, which serves as a finger operation portion 3. Then, linear bent portions 4, 5, 6a, 6b are provided in the tube portion between the flange portion 2 and the finger operation portion 3 along the tube axial direction.

The bent portions 4 and 5 are formed by V-shaped grooves 4a and 5a provided on the inner surface of the tube 1, and the V-shaped grooves 4a and 5a are formed symmetrically with respect to one center line of the tube cross section. The opening angle θ of each line connecting the centers of the groove portions 4a, 5a and the center point O of the tube cross section is set to 144 °, and the bent portion 6a formed by the U-shaped groove is further formed on the outer surface of the tube on the opening angle θ side. , 6b are formed.
The bent portions 6a and 6b are connected by a thin portion 6c. Reference numeral 6 is a composite bent portion including bent portions 6a and 6b and a thin portion 6c. The lengths of the bent portions 4, 5, 6a, 6b and the thin portion 6c are equal to the length of the tube portion excluding the flange portion 2 and the finger operation portion 3. The opening angle θ ′ of each line connecting the bent portions 6a and 6b and the center point O of the tube cross section is set to 48 °. The tube 1 in FIG. 1 can be manufactured by press-fitting a tube-forming material, injection molding, or the like.

FIG. 3 shows a sectional view of a writing instrument using the tube 1 of FIG. The writing instrument 7 includes a writing section 8 and a writing section 8
The front shaft portion 9 coupled to the front shaft portion 9 connected to the writing portion 8.
Tube 1 with a threaded tube and tube 1 for twisting operation
Is provided with a rear shaft portion 10 which covers the finger operation portion 3 and is detachably screwed to the front shaft portion 9. Reference numeral 11 indicates a pen and reference numeral 12 indicates a pen core.

When inhaling ink, after the rear shaft portion 10 is removed from the front shaft portion 9, the finger operating portion 3 is twisted with a finger. Then, in one rotation position, as shown in FIGS. 5 and 6, the entire length of the tube portion excluding the flange portion 2 and the finger operation portion 3 is crushed and twisted to push out the internal air. That is, the tube 1 is bent from the bent portions 4 and 5, and further bent from the bent portions 6a and 6b so that the thin portion 6c is deformed along the opposing inner surface of the tube. It deforms over the entire length of the tube portion excluding the finger operation unit 3. Next, when the finger is released from the finger operation unit 3 to release the twist, the repulsive force of the tube 1 causes the tube 1 to rotate in the opposite direction to restore the twist and restore the original shape, and the ink is sucked.

FIG. 4 shows a sectional view of another writing instrument.
The writing instrument 7 of FIG. 4 has a rear shaft portion 1 screwed to the front shaft portion 13.
It is the same as the writing instrument 7 of FIG. 3 except that 3 a covers most of the tube 1.

Next, another example of the tube will be shown. FIG.
The same reference numerals as in FIG. 1 indicate the same parts as the tube in FIG.

In the tube 1 of FIG. 7, the bent portions 14 and 15 are formed by slits 14a and 15a provided on the outer surface of the tube 1, and the bent portions 14 and 15 are formed symmetrically with respect to one center line of the tube cross section. ing. The opening angle θ of each line connecting the slits 14a and 15a and the center point O of the tube cross section is set to 180 °, and the length of the bent portions 14 and 15 is the tube portion excluding the flange portion 2 and the finger operation portion 3. Equal to the length of. When the tube 1 is twisted, it is bent from the bent portions 14 and 15 as shown in FIG. 8, and the tube 1 is deformed over the entire length of the tube portion excluding the flange portion 2 and the finger operation portion 3. The tube 1 in FIG.
It can be manufactured by press-fitting or injection-molding a tube forming material. The slit is formed by a cutting tool in post processing.

In the tube 1 of FIG. 9, the bent portions 16 and 17 are formed by V-shaped grooves 16a and 17a provided on the inner surface of the tube 1, and the bent portions 16 and 17 are symmetrical with respect to one center line of the tube cross section. Is formed. The opening angle θ of each line connecting the centers of the V-shaped grooves 16a and 17a and the center point O of the tube cross section is set to 180 °, and the lengths of the bent portions 16 and 17 are the flange portion 2 and the finger operation portion. Equal to the length of the tube section, excluding 3. When the tube 1 is twisted, as shown in FIG. 10, the tube 1 is bent from the bent portions 16 and 17, and the tube 1 is deformed over the entire length of the tube portion excluding the flange portion 2 and the finger operation portion 3. The tube 1 shown in FIG. 9 can be manufactured by press-fitting a tube-forming material, injection molding, or the like.

The tube 1 of FIG. 11 has bent portions 18 and 19
Is formed by the U-shaped grooves 18a, 19a provided on the outer surface of the tube 1, and the U-shaped grooves 18a and 19a are formed symmetrically with respect to one center line of the tube cross section. The opening angle θ of each line connecting the center points O of the tube cross sections is set to 180 °, and the U-shaped grooves 20a, 21 are formed on the outer surface of the tube on the center line.
The bent portions 20 and 21 are formed symmetrically by a. The length of the bent portions 18, 19, 20, 21 is equal to the length of the tube portion excluding the flange portion 2 and the finger operation portion 3. When the tube 1 is twisted, the bent portions 20 and 21 are bent toward the inside of the tube 1, the bent portions 18 and 19 are bent toward the outside, and the tube 1 is deformed as shown in FIG. It is deformed over the entire length of the tube part excluding 2 and the finger operation part 3. The tube 1 of FIG. 11 can be manufactured by press-fitting a tube-forming material, injection molding, or the like.

The tube 1 of FIG. 13 is similar to that of the tube 1 of FIG. 1 except that the bent portions 4 and 5 are formed by slits 4b and 5b provided on the outer surface instead of the V-shaped groove provided on the inner surface of the tube 1. It is the same. When the tube 1 is twisted, the tube 1 is bent from the bent portions 4 and 5 as shown in FIG. 14, and further bent from the bent portions 6a and 6b so that the thin portion 6c extends along the inner surface of the tube. It deforms over the entire length of the tube portion excluding the portion 2 and the finger operation portion 3.
The tube 1 in FIG. 13 can be manufactured by press-fitting a tube-forming material, injection molding, or the like. The slit is formed by a cutting tool in post processing.

The tube 1 shown in FIG. 15 has bent portions 14 and 15
Is the same as the tube 1 in FIG. 7, except that the U-shaped grooves 14b and 15b are formed instead of the slits. When the tube 1 is twisted, as shown in FIG.
The tube 1 is bent from the portion 5 and the tube 1 is deformed over the entire length.
The tube 1 in FIG. 15 can be manufactured by press-fitting a tube-forming material, injection molding, or the like.

[0033]

EXAMPLES Next, examples and comparative examples will be shown. Example 1 The ink suction efficiency of the tube 1 shown in FIG. 13 and the tube bulge during twisting were measured. Table 1 shows the results.
The material is silicone rubber, hardness Hs = 50 (JIS
A), outer diameter 6 mm, thickness 1 mm, the length of the tube portion excluding the flange portion 2 and the finger operation portion 3 is 41.5 mm, the thickness of the bent portions 4 and 5 formed by the slits is 0.2 mm,
The bent portions 6a, 6b have a thickness of 0.2 mm, the thin portion 6c has a thickness of 0.3 mm, the bent portions 4, 5, 6a, 6b, and the thin portion 6
A tube having a length of 41.5 mm was used.

Example 2 The ink suction efficiency of the tube 1 shown in FIG. 15 and the tube bulge during twisting were measured. Table 1 shows the results.
The material is silicone rubber, hardness Hs = 50 (JIS
A), outer diameter 6 mm, thickness 1 mm, the length of the tube portion excluding the flange portion 2 and the finger operation portion 3 is 41.5 mm, U
The thickness of the bent portions 14 and 15 formed by the V-shaped groove is 0.2 m
m, and the length of the bent portions 14 and 15 was 41.5 mm.

Example 3 The ink suction efficiency of the tube 1 shown in FIG. 11 and the tube bulge during twisting were measured. Table 1 shows the results.
In addition, the bent portions 18, 19, 2 formed by the U-shaped groove
The same tube as in Example 2 was used except that the number was 0 or 21.

Example 4 The ink suction efficiency of the tube 1 shown in FIG. 7 and the tube bulge during twisting were measured. Table 1 shows the results. The same tube as in Example 2 was used except that the bent portions 14 and 15 formed by slits were used.

Comparative Example The ink suction efficiency of the tube 22 shown in FIG. 18 and the tube bulge during twisting were measured. Table 1 shows the results. The material is silicone rubber, hardness Hs = 50 (J
IS A), outer diameter 6 mm, thickness 1 mm, length 41.5
mm tube was used.

Table 1

[Table 1] The ink inhalation efficiency of the tube was measured as follows.

Ink Intake Efficiency A funnel-shaped suction port was attached to the flange portion of the tube end of each of the examples and comparative examples, and the amount of ink obtained by injecting a commercial fountain pen ink with a syringe from the suction port was taken as the total volume. Next, empty the tube and use your fingers to
A commercially available fountain pen ink was inhaled by twisting it at 0 degree and releasing it, and this was taken as the inhalation amount. Then, a value obtained by dividing this inhalation amount by the above total volume was defined as the ink inhalation efficiency.

Tube bulge during twisting The outer diameter before twisting and the outer diameter after twisting of each of the examples and comparative examples were measured, and the outer diameter before twisting was calculated from the outer diameter after twisting. The value obtained by subtracting was taken as the tube bulge during twisting.

From the results of comparison between the example and the comparative example, it is understood that the tubes of Examples 1 to 4 are excellent in inhalation efficiency. Further, it can be seen that the tubes of Examples 1 to 3 have little bulging when twisted.

[0042]

As described above, in the liquid suction tube of the present invention, a thin bent portion that bends when twisted is provided in the length direction of the tube, and this bent portion is formed by the groove-shaped recess provided on the tube surface. Since the tube is twisted and deformed over the entire length when it is twisted and deformed, it is possible to provide a liquid suction tube with high suction efficiency.

Further, since the writing instrument of the present invention can be composed of the writing section, the shaft section and the ink suction tube, the writing instrument having a simple structure can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of a liquid suction tube of the present invention.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view of the writing instrument of the present invention.

4 is a cross-sectional view showing another example of the writing instrument of FIG.

5 is an explanatory diagram showing a twisted deformation state of the liquid suction tube of FIG. 1. FIG.

FIG. 6 is an enlarged sectional view taken along line BB of FIG. 5;

FIG. 7 is a sectional view showing another example of the liquid suction tube of the present invention.

FIG. 8 is a cross-sectional view of the liquid suction tube of FIG. 7 which is twisted and deformed.

FIG. 9 is a cross-sectional view showing another example of the liquid suction tube of the present invention.

10 is a cross-sectional view of the liquid suction tube of FIG. 9 twisted and deformed.

FIG. 11 is a sectional view showing another example of the liquid suction tube of the present invention.

FIG. 12 is a cross-sectional view of the liquid suction tube of FIG. 11 which is twisted and deformed.

FIG. 13 is a cross-sectional view showing another example of the liquid suction tube of the present invention.

14 is a cross-sectional view of the liquid suction tube of FIG. 13 twisted and deformed.

FIG. 15 is a cross-sectional view showing another example of the liquid suction tube of the present invention.

16 is a cross-sectional view of the liquid suction tube of FIG. 15 twisted and deformed.

FIG. 17 is a front view of a conventional ink suction tube for a writing instrument.

18 is a cross-sectional view of FIG.

FIG. 19 is an explanatory view showing a twisted and deformed state of the tube of FIG. 17.

[Explanation of symbols]

1 tube 3 finger operation part 4, 5, 6a, 6b, 14, 15, 16, 17, 18,
19, 20, 21 Bent portions 4a, 4b, 5a, 5b, 14a, 14b, 15a, 1
5b, 16a, 17a, 18a, 19a, 20a, 21
a groove-shaped recess 8 writing part 9, 13 front shaft part 10, 13a rear shaft part

Claims (4)

[Claims] 1. A tube for sucking a liquid by twisting and releasing the tube, wherein a thin bent portion that bends when twisted is provided in the length direction of the tube, and the bent portion is provided on the tube surface. Liquid suction tube formed by. 2. The liquid suction tube according to claim 1, wherein the liquid suction tube is an ink suction tube for a writing instrument. 3. The liquid suction tube according to claim 1, wherein the liquid suction tube is a dropper tube. 4. A writing section, a shaft section coupled to the writing section, an opening and a finger operation section respectively at a front section and a rear section, and the opening is connected to the writing section and stored in the shaft section. An ink suction tube that sucks ink by twisting and releasing it, and a thin bent portion that bends when twisted is provided in the length direction of the tube, and this bent portion is formed by a groove-shaped recess provided on the tube surface. Writing instrument equipped with the ink suction tube.