JPS63109823A - Two-step straw having stopper - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention consists of an outer tube and an inner tube inserted into the outer tube, and when swallowing, the inner tube is pulled out from the outer tube to extend its length. The present invention relates to a two-stage straw for use.

``Prior Art'' FIGS. 6 and 7 show a conventional two-stage straw, in which reference numeral 1 indicates an inner tube and reference numeral 2 indicates an outer tube. Conventional 2
The stepped straw is formed by tube bodies having considerably different diameters, ie, inner and outer tubes 1 and 2 h.

For this reason, one end 2a of the outer tube 2 was formed with a tapered portion 2b whose diameter was gradually reduced until it came into contact with the circumferential surface of the inner tube 1. Further, a backstopping stopper 2d that protrudes inward is formed near one end 2a of the outer tube 2. With respect to such an outer tube 2, the other end 1a of the inner tube l is provided with a stopper/sealing portion 1 whose diameter is gradually expanded to such an extent that it is loosely inscribed in the outer tube 2.
b was formed.

In use, such a conventional two-stage straw has an inner tube 1 housed within an outer tube 2, as shown in FIG. When using this straw, the inner tube 1 is pulled out from the outer tube 2 to extend its length. Then, as shown in FIG. 7, the stopper-cum-sealing portion 1b of the inner tube 1 engages with the anti-backward stopper 2d of the outer tube 2, thereby pushing the extended straw. In addition, the stopper and sealing part 11 of the inner tube l
) is in contact with the tapered portion 2b of the outer tube 2, and the airtightness of the straw is maintained.

``Problems to be Solved by the Invention'' In such a conventional two-stage straw, there is a stopper and seal of the inner tube 1 between the tapered part 2b of the outer tube 2 and the reverse prevention stopper 2d. Either the inner tube l and the outer tube 2 are thin and delicate, so the stopper-cum-sealing portion 1b and the anti-backward movement stopper 2d are fitted together to prevent the inner tube l from moving back and forth during expansion. , it is difficult to accurately form the taper portion 2b, etc., and for this reason, the conventional two-stage straw cannot securely fix the inner tube 1 during expansion.
That is, there was a problem in that the stopper properties were poor.

In addition, since the conventional two-stage straw has poor stopper properties, the stopper and sealing part of the inner tube l! b to outer tube 2
cannot be brought into sufficient contact with the tapered portion 2b.

For this reason, in conventional two-stage straws, the inner and outer tubes are 1.
There is a problem that the airtightness of 2 cannot be sufficiently improved, and when in use, outside air flows in through the gap between the inner and outer tubes 1.2, making it impossible to drink the beverage smoothly and causing an unpleasant feeling of use. .

Furthermore, in such a two-stage straw, one end 2a of the outer tube 2 and the other end 1a of the inner tube 1 must be processed into a predetermined shape, and then the outer tube 2 and the inner tube 1 must be assembled. There wasn't. For this reason, the conventional two-stage straw has the disadvantage that it takes time and effort to manufacture, making it difficult to reduce manufacturing costs.

``Means for Solving the Problems'' Therefore, in the two-stage straw of the present invention, the inner and outer tubes are formed by tube bodies that are in close contact with each other, and the two tubes are spaced apart in the axial direction of the peripheral wall of the outer tube. Recesses of the same shape reaching the inner tube are provided at two locations on the peripheral wall of the inner tube, and recesses that fit into convex portions formed on the inner wall of the outer tube by the recesses of the outer tube are provided at two locations on the outer tube. The above-mentioned problem was solved by providing the four parts spaced apart in the axial direction by the same distance as the four parts.

"Example" Hereinafter, the two-stage straw of the present invention will be described in detail with reference to Examples.

Since FIG. 1 and FIG. 2 do not show one embodiment of the present invention, the reference numeral 11 in the figures indicates an inner tube, and the reference numeral 12 indicates an outer tube. The outer diameter of the inner tube 11 and the inner diameter of the outer tube 12 are set to be approximately equal, so that the inner tube 11 is tightly inserted into the outer tube 12. In addition, these inner and outer tubes 11. +2 is made of synthetic resin.

Recesses 12a, 12a are formed in the peripheral wall of the outer W+2. These recesses 12a, 12a are provided spaced apart in the axial direction. It is desirable that the distance between the recesses 12a and +2a be set as long as possible so that the two-stage straw can be sufficiently extended. That is, the recess 12
It is desirable that a and 12a be formed near both ends of the outer tube 12, respectively.

These recesses 12a, 12a are formed in the same shape. In this example, the recesses 12a, 12a are located on the outer tube 12.
It is formed in a substantially V-shaped cross section over the entire circumference.

The inner tube 11 has two locations on its peripheral wall (the recess lIa,
lla is formed. These recesses 11a.

+1a is such that the concave portion 12a of the outer tube 12 fits into a convex portion formed inside the outer tube 12. In the two-stage straw of this example, the recesses 11a, 11a of the inner tube 11 are formed to have a substantially V-shaped cross section, corresponding to the recesses 12a, 12a of the outer tube 12. Then, the recess 11a of this inner tube 11,
The outer surface of Ila is brought into close contact with the inner surfaces of the recesses 12a, 12a of the outer tube 12.

In addition, recesses 11a provided at two locations in this inner tube 11,
lla are recesses 12a and 12 provided in the outer tube 12;
They are spaced apart in the axial direction by the same distance as a.

Next, an example of a method for manufacturing the two-stage straw of the present invention will be explained.

In order to manufacture the two-stage straw of the present invention, first, the inner and outer tubes are
It is desirable to combine 1.12.

As a means of combining the inner and outer tubes 11, 12, either a method of combining the inner tube II and the outer tube 12, which are manufactured separately, or a method of simultaneously molding the inner and outer tubes 11, 12 in a combined state from the beginning is adopted. You may do so.

As the latter method of simultaneously molding the combined inner and outer tubes 11 and 12, there is a thin-walled double tube manufacturing method previously proposed by the present inventors (filed on September 30, 1988). In this method, an inner tube 11 is extruded by a first extruder, and while a fluid such as air is fed into the inner tube 11, the inner tube 11 is placed in the center of a die of a second extruder. The inner tube 11 is guided into the provided through hole and is molded by this second extrusion molding machine.
This is a method of manufacturing a double tube by extruding the material that will become the outer tube 12 on the outer periphery of the outer tube, and then immediately cooling the material that will become the outer tube 12 while sucking it from the outer periphery. By appropriately cutting the tube, a double tube consisting of a combination of inner and outer tubes 11 and 12 of a predetermined length can be obtained.

A double tube made by combining the inner and outer tubes 11 and 12 manufactured in this way is used for the upper heater 2 as shown in FIG.
The heater 22 is supplied to a device provided with two pairs of heaters 22, each consisting of a lower heater 22a and a lower heater 22b.

When manufacturing the two-stage straw of the above embodiment, the tips of the upper and lower heaters 22a, 22b are formed into a substantially V-shape, and the double tube is
Either the heaters 22a and 22b are rotated an appropriate number of times between the heaters 22a and 22b, or the heaters 22a and 22b are rotated and moved intermittently between the heaters 22a and 22b. The inner and outer tubes of the double tube passed through this device 11.
12, as shown in FIG.
12a, 12a are formed at the same time, thereby manufacturing the two-stage straw of the present invention.

In the two-stage straw of the present invention, the inner tube 11 is manufactured separately.
．． When manufacturing after combining the outer tube 12, use an inner tube 11 that is longer than the outer tube 12.
It is possible to manufacture a two-stage straw that can be easily pulled out. Further, it is possible to process the tip only at the end of the inner tube 11.

On the other hand, when the double tube manufacturing method previously proposed by the present inventors is used, the gap between the inner and outer tubes 11 and 12 is extremely small, resulting in a two-stage straw with very little air leakage. Obtainable. Another advantage is that there is no need for a step of assembling the inner and outer tubes II and 12 during manufacturing. When cutting the above double tube to form the inner and outer tubes 11 and 12, the inner and outer tubes 1
1.12 become the same length, making it difficult to pull out the inner tube 11. In such a case, the inner and outer tubes 11.12 are sharpened, and the inner tube 11 is rotated 180° within the outer tube 12.
As shown in FIG. 4, the ease of drawing out the inner tube 11 can be improved by looking through the end of the inner tube 11 from the end of the outer tube 12.

"Operation" The two-stage straw of the present invention is supplied with the inner tube 11 housed in the outer tube 12, as shown in FIG. In this state, the recess 11a on the rear end side of the inner tube 11 is connected to the recess 12a on the rear end side of the outer tube 12, and the recess 11a on the front end side of the inner tube 11
1a are fitted into recesses 12a on the distal end side of the outer tube 12, respectively.

On the other hand, when the inner tube 11 is pulled out from the outer tube 12 in order to release the initial fitted state by utilizing the unevenness of the inner and outer tubes 11 and 12 during use, the rear end side of the inner tube 11 Recess 1
1a fits into a recess 12a on the distal end side of the outer tube 12, thereby maintaining the extended state of the two-stage straw. The two-stage straw of the present invention has a concave portion 11a of an inner tube 11, an Il
a is the recess 12a of the outer tube 12,! 2a, and since the distance between the recesses 11a and Ila of the inner tube 11 and the distance between the recesses 12a and 12a of the outer tube 12 are the same, as described above, the recesses 11a and Ila are the same size. la, I
2a and 12a can be formed simultaneously.

In addition, since the recesses 11a, lla and the recesses 12a, 12a formed in this way fit tightly into each other, the two-stage straw of the present invention is a stopper with extremely small play between the inner and outer tubes 11 and 12 during expansion. Becomes an excellent ninja.

Furthermore, in the two-stage straw of the present invention, the narrow gap between the inner and outer tube balls [, 12] is further sealed by the tightly fitted recesses 11a and 12a, so the airtightness of the straw is improved, and the outside air is strobed during suction. -No flow into the interior.

Note that in the above embodiment, the recess 12a was formed all around the outer tube 12, but in the two-stage straw according to the present invention,
As shown in Figure 5, there are multiple recesses spaced intermittently in the circumferential direction of the tube! 3... and concave part 1
Even if 2a is formed, similar effects can be obtained. The same applies to the recessed portion lIa of the inner tube 11.

"Effects of the Invention" In the two-stage straw of the present invention having the configuration described above, the recesses of the inner and outer tubes fit snugly into each other to exhibit stopper properties, and the fitted recesses The second aspect of the present invention is that the narrow gap between the
The stepped straw has good stopping properties during expansion and also provides good airtightness. Therefore, the two-stage straw of the present invention provides a good feeling of use when drinking.

Further, when manufacturing the two-stage straw of the present invention, the recessed portions of the inner and outer tubes can be formed at the same time as described above. Therefore, the straw of the present invention can be manufactured through a simple process, and manufacturing costs can be easily reduced.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the two-stage straw of the present invention in an extended state, FIG. 2 is a cross-sectional view showing the same embodiment in a housed state (initial fitted state), and FIG. FIG. 4 is a cross-sectional view for explaining the manufacturing method of the same embodiment, and FIG. 4 shows the main parts of another embodiment of the two-stage straw of the present invention. A side view showing an outer tube constituting an embodiment of the two-stage straw pond of the invention, and FIGS. 6 and 7 are cross-sectional views showing a conventional two-stage straw. 11... Inner tube, Ila... Recessed part, 12... Outer tube,
+2a...concavity.

Claims (1)

[Claims] In an expandable two-stage straw consisting of an outer tube and an inner tube tightly inserted into the outer tube, two recesses of the same shape reaching the inner tube are provided in two axially spaced apart peripheral walls of the outer tube. ,
Recesses that fit into the convex portions formed on the inner wall of the outer tube are provided at two locations on the peripheral wall of the inner tube, spaced apart in the axial direction by the same distance as the recesses formed in the outer tube. A two-tier straw with a stopper.